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Merge pull request #734 from floooh/sokol-spine

New sokol_spine.h header.
Andre Weissflog 2 年之前
父節點
當前提交
574edfa3b8

+ 1 - 0
.gitignore

@@ -1,4 +1,5 @@
 .vscode/
+build/
 #>fips
 # this area is managed by fips, do not edit
 .fips-*

+ 1 - 0
tests/.gitignore

@@ -1,3 +1,4 @@
 build/
 ext/fips-cimgui/
 ext/sokol-tools-bin/
+ext/spine-runtimes/

+ 53 - 3
tests/CMakeLists.txt

@@ -5,9 +5,11 @@ set(CMAKE_C_STANDARD 11)
 set(CMAKE_CXX_STANDARD 17)  # needed for UWP
 
 # SOKOL_GLCORE33, SOKOL_GLES2, SOKOL_GLES3, SOKOL_D3D11, SOKOL_METAL, SOKOL_WGPU, SOKOL_DUMMY
-option(SOKOL_BACKEND "Select 3D backend API" SOKOL_GLCORE33)
+set(SOKOL_BACKEND "SOKOL_DUMMY_BACKEND" CACHE STRING "Select 3D backend API")
+set_property(CACHE SOKOL_BACKEND PROPERTY STRINGS SOKOL_GLCORE33 SOKOL_METAL SOKOL_D3D11 SOKOL_DUMMY_BACKEND)
 option(SOKOL_FORCE_EGL "Force EGL with GLCORE33 backend" OFF)
 option(USE_ARC "Enable/disable ARC" OFF)
+option(USE_ANALYZER "Enable/disable clang analyzer" OFF)
 
 if (CMAKE_SYSTEM_NAME STREQUAL Emscripten)
     set(EMSCRIPTEN 1)
@@ -45,8 +47,8 @@ set(link_flags)
 set(system_libs)
 
 if (CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
-    set(c_flags ${c_flags} /W4 /WX)
-    set(cxx_flags ${cxx_flags} /W4 /WX /EHsc)
+    set(c_flags ${c_flags} /W4 /WX /D_CRT_SECURE_NO_WARNINGS)
+    set(cxx_flags ${cxx_flags} /W4 /WX /EHsc /D_CRT_SECURE_NO_WARNINGS)
 else()
     set(c_flags ${c_flags} -Wall -Wextra -Werror -Wsign-conversion)
     set(cxx_flags ${cxx_flags} -Wall -Wextra -Werror -Wsign-conversion -fno-rtti -fno-exceptions)
@@ -165,6 +167,54 @@ add_library(imgui
     ext/fips-cimgui/cimgui/imgui/imgui_widgets.cpp)
 target_include_directories(imgui SYSTEM PUBLIC ext/fips-cimgui/cimgui/imgui)
 
+add_library(spine
+    ext/spine-runtimes/spine-c/spine-c/src/spine/Animation.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/AnimationState.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/AnimationStateData.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/Array.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/Atlas.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/AtlasAttachmentLoader.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/Attachment.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/AttachmentLoader.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/Bone.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/BoneData.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/BoundingBoxAttachment.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/ClippingAttachment.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/Color.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/Debug.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/Event.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/EventData.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/IkConstraint.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/IkConstraintData.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/Json.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/Json.h
+    ext/spine-runtimes/spine-c/spine-c/src/spine/MeshAttachment.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/PathAttachment.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/PathConstraint.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/PathConstraintData.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/PointAttachment.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/RegionAttachment.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/Sequence.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/Skeleton.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/SkeletonBinary.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/SkeletonBounds.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/SkeletonClipping.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/SkeletonData.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/SkeletonJson.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/Skin.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/Slot.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/SlotData.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/TransformConstraint.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/TransformConstraintData.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/Triangulator.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/VertexAttachment.c
+    ext/spine-runtimes/spine-c/spine-c/src/spine/extension.c)
+target_include_directories(spine SYSTEM PUBLIC ext/spine-runtimes/spine-c/spine-c/include)
+if (CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
+    target_compile_options(spine PRIVATE /wd4267 /wd4244)   # conversion from 'x' to 'y' possible loss of data
+endif()
+
+
 add_library(nuklear ext/nuklear.c)
 
 add_subdirectory(compile)

+ 3 - 1
tests/analyze_win.cmd

@@ -1,6 +1,9 @@
 if not exist ext/fips-cimgui/ (
     git clone --depth 1 --recursive https://github.com/fips-libs/fips-cimgui ext/fips-cimgui
 )
+if not exist ext/spine-runtimes/ (
+    git clone --depth 1 --recursive https://github.com/EsotericSoftware/spine-runtimes/ ext/spine-runtimes
+)
 
 md build\win_gl_analyze
 cd build\win_gl_analyze
@@ -13,4 +16,3 @@ cd build\win_d3d11_analyze
 cmake -GNinja -DSOKOL_BACKEND=SOKOL_D3D11 -DUSE_ANALYZER=ON -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ ../.. || exit /b 10
 cmake --build . || exit /b 10
 cd ..\..
-

+ 11 - 0
tests/functional/CMakeLists.txt

@@ -1,7 +1,16 @@
 if (NOT ANDROID AND NOT UWP)
 
 file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/assets/comsi.s3m DESTINATION ${CMAKE_BINARY_DIR})
+file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/../ext/spine-runtimes/examples/spineboy/export/spineboy-pro.json DESTINATION ${CMAKE_BINARY_DIR})
+file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/../ext/spine-runtimes/examples/spineboy/export/spineboy-pro.skel DESTINATION ${CMAKE_BINARY_DIR})
+file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/../ext/spine-runtimes/examples/spineboy/export/spineboy.atlas DESTINATION ${CMAKE_BINARY_DIR})
+file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/../ext/spine-runtimes/examples/spineboy/export/spineboy.png DESTINATION ${CMAKE_BINARY_DIR})
+
 file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/assets/comsi.s3m DESTINATION ${CMAKE_BINARY_DIR}/Debug)
+file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/../ext/spine-runtimes/examples/spineboy/export/spineboy-pro.json DESTINATION ${CMAKE_BINARY_DIR}/Debug)
+file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/../ext/spine-runtimes/examples/spineboy/export/spineboy-pro.skel DESTINATION ${CMAKE_BINARY_DIR}/Debug)
+file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/../ext/spine-runtimes/examples/spineboy/export/spineboy.atlas DESTINATION ${CMAKE_BINARY_DIR}/Debug)
+file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/../ext/spine-runtimes/examples/spineboy/export/spineboy.png DESTINATION ${CMAKE_BINARY_DIR}/Debug)
 
 set(c_sources
     sokol_args_test.c
@@ -12,9 +21,11 @@ set(c_sources
     sokol_gl_test.c
     sokol_shape_test.c
     sokol_color_test.c
+    sokol_spine_test.c
     sokol_test.c
 )
 add_executable(sokol-test ${c_sources})
+target_link_libraries(sokol-test PUBLIC spine)
 configure_c(sokol-test)
 
 endif()

+ 3 - 0
tests/functional/assets/readme.txt

@@ -0,0 +1,3 @@
+Spine examples taken from:
+
+https://github.com/EsotericSoftware/spine-runtimes/tree/4.1/examples

+ 2 - 0
tests/functional/force_dummy_backend.h

@@ -16,5 +16,7 @@
 #if defined(SOKOL_WGPU)
 #undef SOKOL_WGPU
 #endif
+#ifndef SOKOL_DUMMY_BACKEND
 #define SOKOL_DUMMY_BACKEND
+#endif
 

+ 2 - 0
tests/functional/sokol_audio_test.c

@@ -2,7 +2,9 @@
 //  sokol_audio_test.c
 //------------------------------------------------------------------------------
 #define SOKOL_IMPL
+#ifndef SOKOL_DUMMY_BACKEND
 #define SOKOL_DUMMY_BACKEND
+#endif
 #include "sokol_audio.h"
 #include "utest.h"
 

+ 1192 - 0
tests/functional/sokol_spine_test.c

@@ -0,0 +1,1192 @@
+//------------------------------------------------------------------------------
+//  sokol_spine_test.c
+//------------------------------------------------------------------------------
+#include "sokol_gfx.h"
+#define SOKOL_SPINE_IMPL
+#include "spine/spine.h"
+#include "sokol_spine.h"
+#include "utest.h"
+
+#define T(b) EXPECT_TRUE(b)
+
+static sspine_error last_error = SSPINE_ERROR_OK;
+static void log_func(const char* tag, uint32_t log_level, uint32_t error_code, const char* error_id, int line_nr, const char* filename, void* user_data) {
+    (void)tag; (void)log_level; (void)error_id; (void)line_nr; (void)filename; (void)user_data;
+    last_error = error_code;
+}
+
+static void init() {
+    last_error = SSPINE_ERROR_OK;
+    sg_setup(&(sg_desc){0});
+    sspine_setup(&(sspine_desc){ .logger = { .func = log_func } });
+}
+
+static void init_with_desc(const sspine_desc* desc) {
+    last_error = SSPINE_ERROR_OK;
+    sspine_desc desc1 = *desc;
+    desc1.logger.func = log_func;
+    sg_setup(&(sg_desc){0});
+    sspine_setup(&desc1);
+}
+
+static void shutdown() {
+    sspine_shutdown();
+    sg_shutdown();
+}
+
+// NOTE: this guarantees that the data is zero terminated because the loaded data
+// might either be binary or text (the zero sentinel is NOT counted in the returned size)
+static sspine_range load_data(const char* path) {
+    assert(path);
+    FILE* fp = fopen(path, "rb");
+    assert(fp);
+    fseek(fp, 0, SEEK_END);
+    const size_t size = (size_t)ftell(fp);
+    fseek(fp, 0, SEEK_SET);
+    // room for terminating zero
+    const size_t alloc_size = size + 1;
+    uint8_t* ptr = (uint8_t*)malloc(alloc_size);
+    memset(ptr, 0, alloc_size);
+    // NOTE: GCC warns if result of fread() is ignored
+    size_t num_bytes = fread(ptr, size, 1, fp);
+    (void)num_bytes;
+    fclose(fp);
+    return (sspine_range) { .ptr = ptr, .size = size };
+}
+
+static void free_data(sspine_range r) {
+    free((void*)r.ptr);
+}
+
+static sspine_atlas create_atlas(void) {
+    sspine_range atlas_data = load_data("spineboy.atlas");
+    sspine_atlas atlas = sspine_make_atlas(&(sspine_atlas_desc){
+        .data = atlas_data
+    });
+    free_data(atlas_data);
+    return atlas;
+}
+
+static sspine_skeleton create_skeleton_json(sspine_atlas atlas) {
+    sspine_range skeleton_json_data = load_data("spineboy-pro.json");
+    sspine_skeleton skeleton = sspine_make_skeleton(&(sspine_skeleton_desc){
+        .atlas = atlas,
+        .json_data = (const char*)skeleton_json_data.ptr
+    });
+    free_data(skeleton_json_data);
+    return skeleton;
+}
+
+static sspine_skeleton create_skeleton_binary(sspine_atlas atlas) {
+    sspine_range skeleton_binary_data = load_data("spineboy-pro.skel");
+    sspine_skeleton skeleton = sspine_make_skeleton(&(sspine_skeleton_desc){
+        .atlas = atlas,
+        .binary_data = skeleton_binary_data
+    });
+    free_data(skeleton_binary_data);
+    return skeleton;
+}
+
+static sspine_skeleton create_skeleton(void) {
+    return create_skeleton_json(create_atlas());
+}
+
+static sspine_instance create_instance(void) {
+    return sspine_make_instance(&(sspine_instance_desc){
+        .skeleton = create_skeleton(),
+    });
+}
+
+UTEST(sokol_spine, default_init_shutdown) {
+    // FIXME!
+    T(true);
+}
+
+UTEST(sokol_spine, atlas_pool_exhausted) {
+    init_with_desc(&(sspine_desc){
+        .atlas_pool_size = 4,
+    });
+    for (int i = 0; i < 4; i++) {
+        sspine_atlas atlas = sspine_make_atlas(&(sspine_atlas_desc){0});
+        T(sspine_get_atlas_resource_state(atlas) == SSPINE_RESOURCESTATE_FAILED);
+        T(last_error == SSPINE_ERROR_ATLAS_DESC_NO_DATA);
+    }
+    sspine_atlas atlas = sspine_make_atlas(&(sspine_atlas_desc){0});
+    T(SSPINE_INVALID_ID == atlas.id);
+    T(sspine_get_atlas_resource_state(atlas) == SSPINE_RESOURCESTATE_INVALID);
+    T(last_error == SSPINE_ERROR_ATLAS_POOL_EXHAUSTED);
+    shutdown();
+}
+
+UTEST(sokol_spine, make_destroy_atlas_ok) {
+    init();
+    sspine_atlas atlas = create_atlas();
+    T(sspine_get_atlas_resource_state(atlas) == SSPINE_RESOURCESTATE_VALID);
+    T(sspine_atlas_valid(atlas));
+    sspine_destroy_atlas(atlas);
+    T(sspine_get_atlas_resource_state(atlas) == SSPINE_RESOURCESTATE_INVALID);
+    T(!sspine_atlas_valid(atlas))
+    shutdown();
+}
+
+UTEST(sokol_spine, make_atlas_fail_no_data) {
+    init();
+    sspine_atlas atlas = sspine_make_atlas(&(sspine_atlas_desc){0});
+    T(atlas.id != SSPINE_INVALID_ID);
+    T(last_error == SSPINE_ERROR_ATLAS_DESC_NO_DATA);
+    T(sspine_get_atlas_resource_state(atlas) == SSPINE_RESOURCESTATE_FAILED);
+    T(!sspine_atlas_valid(atlas));
+    shutdown();
+}
+
+// an invalid atlas must return zero number of images
+UTEST(sokol_spine, failed_atlas_no_images) {
+    init();
+    sspine_atlas atlas = sspine_make_atlas(&(sspine_atlas_desc){0});
+    T(last_error == SSPINE_ERROR_ATLAS_DESC_NO_DATA);
+    T(atlas.id != SSPINE_INVALID_ID);
+    T(!sspine_atlas_valid(atlas));
+    T(sspine_num_images(atlas) == 0);
+    shutdown();
+
+}
+
+// NOTE: spine-c doesn't detect wrong/corrupt atlas file data, so we can't test for that
+
+UTEST(sokol_spine, image_valid) {
+    init();
+    sspine_atlas atlas = create_atlas();
+    T(sspine_image_valid(sspine_image_by_index(atlas, 0)));
+    T(!sspine_image_valid(sspine_image_by_index(atlas, 1)));
+    T(!sspine_image_valid(sspine_image_by_index(atlas, -1)));
+    sspine_destroy_atlas(atlas);
+    T(!sspine_image_valid(sspine_image_by_index(atlas, 0)));
+    shutdown();
+}
+
+UTEST(sokol_spine, atlas_image_info) {
+    init();
+    sspine_atlas atlas = create_atlas();
+    T(sspine_atlas_valid(atlas));
+    T(sspine_num_images(atlas) == 1);
+    const sspine_image_info img_info = sspine_get_image_info(sspine_image_by_index(atlas, 0));
+    T(img_info.valid);
+    T(img_info.sgimage.id != SG_INVALID_ID);
+    T(sg_query_image_state(img_info.sgimage) == SG_RESOURCESTATE_ALLOC);
+    T(strcmp(img_info.filename.cstr, "spineboy.png") == 0);
+    T(img_info.min_filter == SG_FILTER_LINEAR);
+    T(img_info.mag_filter == SG_FILTER_LINEAR);
+    T(img_info.wrap_u == SG_WRAP_MIRRORED_REPEAT);
+    T(img_info.wrap_v == SG_WRAP_MIRRORED_REPEAT);
+    T(img_info.width == 1024);
+    T(img_info.height == 256);
+    T(img_info.premul_alpha == false);
+    shutdown();
+}
+
+UTEST(sokol_spine, atlas_with_overrides) {
+    init();
+    sspine_range atlas_data = load_data("spineboy.atlas");
+    sspine_atlas atlas = sspine_make_atlas(&(sspine_atlas_desc){
+        .data = atlas_data,
+        .override = {
+            .min_filter = SG_FILTER_NEAREST_MIPMAP_NEAREST,
+            .mag_filter = SG_FILTER_NEAREST,
+            .wrap_u = SG_WRAP_REPEAT,
+            .wrap_v = SG_WRAP_CLAMP_TO_EDGE,
+            .premul_alpha_enabled = true,
+        }
+    });
+    T(sspine_atlas_valid(atlas));
+    T(sspine_num_images(atlas) == 1);
+    const sspine_image_info img_info = sspine_get_image_info(sspine_image_by_index(atlas, 0));
+    T(img_info.valid);
+    T(img_info.sgimage.id != SG_INVALID_ID);
+    T(sg_query_image_state(img_info.sgimage) == SG_RESOURCESTATE_ALLOC);
+    T(strcmp(img_info.filename.cstr, "spineboy.png") == 0);
+    T(img_info.min_filter == SG_FILTER_NEAREST_MIPMAP_NEAREST);
+    T(img_info.mag_filter == SG_FILTER_NEAREST);
+    T(img_info.wrap_u == SG_WRAP_REPEAT);
+    T(img_info.wrap_v == SG_WRAP_CLAMP_TO_EDGE);
+    T(img_info.width == 1024);
+    T(img_info.height == 256);
+    T(img_info.premul_alpha == true);
+    shutdown();
+}
+
+UTEST(sokol_spine, skeleton_pool_exhausted) {
+    init_with_desc(&(sspine_desc){
+        .skeleton_pool_size = 4
+    });
+    for (int i = 0; i < 4; i++) {
+        sspine_skeleton skeleton = sspine_make_skeleton(&(sspine_skeleton_desc){0});
+        T(sspine_get_skeleton_resource_state(skeleton) == SSPINE_RESOURCESTATE_FAILED);
+        T(last_error == SSPINE_ERROR_SKELETON_DESC_NO_DATA);
+    }
+    sspine_skeleton skeleton = sspine_make_skeleton(&(sspine_skeleton_desc){0});
+    T(SSPINE_INVALID_ID == skeleton.id);
+    T(sspine_get_skeleton_resource_state(skeleton) == SSPINE_RESOURCESTATE_INVALID);
+    T(last_error == SSPINE_ERROR_SKELETON_POOL_EXHAUSTED);
+    shutdown();
+}
+
+UTEST(sokol_spine, make_destroy_skeleton_json_ok) {
+    init();
+    sspine_skeleton skeleton = create_skeleton_json(create_atlas());
+    T(sspine_get_skeleton_resource_state(skeleton) == SSPINE_RESOURCESTATE_VALID);
+    T(sspine_skeleton_valid(skeleton));
+    sspine_destroy_skeleton(skeleton);
+    T(sspine_get_skeleton_resource_state(skeleton) == SSPINE_RESOURCESTATE_INVALID);
+    T(!sspine_skeleton_valid(skeleton));
+    shutdown();
+}
+
+UTEST(sokol_spine, make_destroy_skeleton_binary_ok) {
+    init();
+    sspine_skeleton skeleton = create_skeleton_binary(create_atlas());
+    T(sspine_get_skeleton_resource_state(skeleton) == SSPINE_RESOURCESTATE_VALID);
+    T(sspine_skeleton_valid(skeleton));
+    sspine_destroy_skeleton(skeleton);
+    T(sspine_get_skeleton_resource_state(skeleton) == SSPINE_RESOURCESTATE_INVALID);
+    T(!sspine_skeleton_valid(skeleton));
+    shutdown();
+}
+
+UTEST(sokol_spine, make_skeleton_fail_no_data) {
+    init();
+    sspine_atlas atlas = create_atlas();
+    sspine_skeleton skeleton = sspine_make_skeleton(&(sspine_skeleton_desc){
+        .atlas = atlas
+    });
+    T(sspine_get_skeleton_resource_state(skeleton) == SSPINE_RESOURCESTATE_FAILED);
+    T(!sspine_skeleton_valid(skeleton));
+    T(last_error == SSPINE_ERROR_SKELETON_DESC_NO_DATA);
+    shutdown();
+}
+
+UTEST(sokol_spine, make_skeleton_fail_no_atlas) {
+    init();
+    sspine_range skeleton_json_data = load_data("spineboy-pro.json");
+    sspine_skeleton skeleton = sspine_make_skeleton(&(sspine_skeleton_desc){
+        .json_data = (const char*)skeleton_json_data.ptr
+    });
+    free_data(skeleton_json_data);
+    T(sspine_get_skeleton_resource_state(skeleton) == SSPINE_RESOURCESTATE_FAILED);
+    T(!sspine_skeleton_valid(skeleton));
+    T(last_error == SSPINE_ERROR_SKELETON_DESC_NO_ATLAS);
+    shutdown();
+}
+
+UTEST(sokol_spine, make_skeleton_fail_with_failed_atlas) {
+    init();
+    sspine_atlas atlas = sspine_make_atlas(&(sspine_atlas_desc){0});
+    T(last_error == SSPINE_ERROR_ATLAS_DESC_NO_DATA);
+    T(sspine_get_atlas_resource_state(atlas) == SSPINE_RESOURCESTATE_FAILED);
+    sspine_skeleton skeleton = create_skeleton_json(atlas);
+    T(sspine_get_skeleton_resource_state(skeleton) == SSPINE_RESOURCESTATE_FAILED);
+    T(!sspine_skeleton_valid(skeleton));
+    T(last_error == SSPINE_ERROR_SKELETON_ATLAS_NOT_VALID);
+    shutdown();
+}
+
+UTEST(sokol_spine, make_skeleton_json_fail_corrupt_data) {
+    init();
+    sspine_atlas atlas = create_atlas();
+    const char* invalid_json_data = "This is not valid JSON!";
+    sspine_skeleton skeleton = sspine_make_skeleton(&(sspine_skeleton_desc){
+        .atlas = atlas,
+        .json_data = (const char*)invalid_json_data,
+    });
+    T(sspine_get_skeleton_resource_state(skeleton) == SSPINE_RESOURCESTATE_FAILED);
+    T(last_error == SSPINE_ERROR_SPINE_SKELETON_DATA_CREATION_FAILED);
+    sspine_destroy_skeleton(skeleton);
+    T(sspine_get_skeleton_resource_state(skeleton) == SSPINE_RESOURCESTATE_INVALID);
+    shutdown();
+}
+
+// FIXME: this crashes the spine-c runtime
+/*
+UTEST(sokol_spine, make_skeleton_binary_fail_corrupt_data) {
+    init();
+    sspine_atlas atlas = create_atlas();
+    uint8_t invalid_binary_data[] = { 0x23, 0x63, 0x11, 0xFF };
+    sspine_skeleton skeleton = sspine_make_skeleton(&(sspine_skeleton_desc){
+        .atlas = atlas,
+        .binary_data = { .ptr = invalid_binary_data, .size = sizeof(invalid_binary_data) }
+    });
+    T(sspine_get_skeleton_resource_state(skeleton) == SSPINE_RESOURCESTATE_FAILED);
+    sspine_destroy_skeleton(skeleton);
+    T(sspine_get_skeleton_resource_state(skeleton) == SSPINE_RESOURCESTATE_INVALID);
+    shutdown();
+}
+*/
+
+UTEST(sokol_spine, instance_pool_exhausted) {
+    init_with_desc(&(sspine_desc){
+        .instance_pool_size = 4
+    });
+    for (int i = 0; i < 4; i++) {
+        sspine_instance instance = sspine_make_instance(&(sspine_instance_desc){0});
+        T(sspine_get_instance_resource_state(instance) == SSPINE_RESOURCESTATE_FAILED);
+        T(last_error == SSPINE_ERROR_INSTANCE_DESC_NO_SKELETON);
+    }
+    sspine_instance instance = sspine_make_instance(&(sspine_instance_desc){0});
+    T(SSPINE_INVALID_ID == instance.id);
+    T(sspine_get_instance_resource_state(instance) == SSPINE_RESOURCESTATE_INVALID);
+    T(last_error == SSPINE_ERROR_INSTANCE_POOL_EXHAUSTED);
+    shutdown();
+}
+
+UTEST(sokol_spine, make_destroy_instance_ok) {
+    init();
+    sspine_instance instance = sspine_make_instance(&(sspine_instance_desc){
+        .skeleton = create_skeleton_json(create_atlas())
+    });
+    T(sspine_get_instance_resource_state(instance) == SSPINE_RESOURCESTATE_VALID);
+    T(sspine_instance_valid(instance));
+    sspine_destroy_instance(instance);
+    T(sspine_get_instance_resource_state(instance) == SSPINE_RESOURCESTATE_INVALID);
+    T(!sspine_instance_valid(instance));
+    shutdown();
+}
+
+UTEST(sokol_spine, make_instance_fail_no_skeleton) {
+    init();
+    sspine_instance instance = sspine_make_instance(&(sspine_instance_desc){0});
+    T(sspine_get_instance_resource_state(instance) == SSPINE_RESOURCESTATE_FAILED);
+    T(last_error == SSPINE_ERROR_INSTANCE_DESC_NO_SKELETON);
+    sspine_destroy_instance(instance);
+    T(sspine_get_instance_resource_state(instance) == SSPINE_RESOURCESTATE_INVALID);
+    shutdown();
+}
+
+UTEST(sokol_spine, make_instance_fail_with_failed_skeleton) {
+    init();
+    sspine_skeleton failed_skeleton = sspine_make_skeleton(&(sspine_skeleton_desc){0});
+    T(last_error == SSPINE_ERROR_SKELETON_DESC_NO_DATA);
+    T(sspine_get_skeleton_resource_state(failed_skeleton) == SSPINE_RESOURCESTATE_FAILED);
+    sspine_instance instance = sspine_make_instance(&(sspine_instance_desc){
+        .skeleton = failed_skeleton
+    });
+    T(sspine_get_instance_resource_state(instance) == SSPINE_RESOURCESTATE_FAILED);
+    T(last_error == SSPINE_ERROR_INSTANCE_SKELETON_NOT_VALID);
+    shutdown();
+}
+
+UTEST(sokol_spine, make_instance_fail_with_destroyed_atlas) {
+    init();
+    sspine_atlas atlas = create_atlas();
+    T(sspine_atlas_valid(atlas));
+    sspine_skeleton skeleton = create_skeleton_json(atlas);
+    T(sspine_skeleton_valid(skeleton));
+    sspine_destroy_atlas(atlas);
+    T(!sspine_atlas_valid(atlas));
+    sspine_instance instance = sspine_make_instance(&(sspine_instance_desc){
+        .skeleton = skeleton
+    });
+    T(sspine_get_instance_resource_state(instance) == SSPINE_RESOURCESTATE_FAILED);
+    T(last_error == SSPINE_ERROR_INSTANCE_ATLAS_NOT_VALID);
+    shutdown();
+}
+
+UTEST(sokol_spine, get_skeleton_atlas) {
+    init();
+    sspine_atlas atlas = create_atlas();
+    sspine_skeleton skeleton = create_skeleton_json(atlas);
+    T(sspine_get_skeleton_atlas(skeleton).id == atlas.id);
+    sspine_destroy_skeleton(skeleton);
+    T(sspine_get_skeleton_atlas(skeleton).id == SSPINE_INVALID_ID);
+    shutdown();
+}
+
+UTEST(sokol_spine, get_instance_skeleton) {
+    init();
+    sspine_atlas atlas = create_atlas();
+    sspine_skeleton skeleton = create_skeleton_json(atlas);
+    sspine_instance instance = sspine_make_instance(&(sspine_instance_desc){
+        .skeleton = skeleton
+    });
+    T(sspine_get_instance_skeleton(instance).id == skeleton.id);
+    sspine_destroy_instance(instance);
+    T(sspine_get_instance_skeleton(instance).id == SSPINE_INVALID_ID);
+    shutdown();
+}
+
+UTEST(sokol_spine, set_get_position) {
+    init();
+    sspine_instance instance = create_instance();
+    sspine_set_position(instance, (sspine_vec2){ .x=1.0f, .y=2.0f });
+    const sspine_vec2 pos = sspine_get_position(instance);
+    T(pos.x == 1.0f);
+    T(pos.y == 2.0f);
+    shutdown();
+}
+
+UTEST(sokol_spine, set_get_position_destroyed_instance) {
+    init();
+    sspine_instance instance = create_instance();
+    sspine_set_position(instance, (sspine_vec2){ .x=1.0f, .y=2.0f });
+    sspine_destroy_instance(instance);
+    const sspine_vec2 pos = sspine_get_position(instance);
+    T(pos.x == 0.0f);
+    T(pos.y == 0.0f);
+    shutdown();
+}
+
+UTEST(sokol_spine, set_get_scale) {
+    init();
+    sspine_instance instance = create_instance();
+    sspine_set_scale(instance, (sspine_vec2){ .x=2.0f, .y=3.0f });
+    const sspine_vec2 scale = sspine_get_scale(instance);
+    T(scale.x == 2.0f);
+    T(scale.y == 3.0f);
+    shutdown();
+}
+
+UTEST(sokol_spine, set_get_scale_destroyed_instance) {
+    init();
+    sspine_instance instance = create_instance();
+    sspine_set_scale(instance, (sspine_vec2){ .x=2.0f, .y=3.0f });
+    sspine_destroy_instance(instance);
+    const sspine_vec2 scale = sspine_get_scale(instance);
+    T(scale.x == 0.0f);
+    T(scale.y == 0.0f);
+    shutdown();
+}
+
+UTEST(sokol_spine, set_get_color) {
+    init();
+    sspine_instance instance = create_instance();
+    sspine_set_color(instance, (sspine_color) { .r=1.0f, .g=2.0f, .b=3.0f, .a=4.0f });
+    const sspine_color color = sspine_get_color(instance);
+    T(color.r == 1.0f);
+    T(color.g == 2.0f);
+    T(color.b == 3.0f);
+    T(color.a == 4.0f);
+    shutdown();
+}
+
+UTEST(sokol_spine, set_get_color_destroyed_instance) {
+    init();
+    sspine_instance instance = create_instance();
+    sspine_set_color(instance, (sspine_color) { .r=1.0f, .g=2.0f, .b=3.0f, .a=4.0f });
+    sspine_destroy_instance(instance);
+    const sspine_color color = sspine_get_color(instance);
+    T(color.r == 0.0f);
+    T(color.g == 0.0f);
+    T(color.b == 0.0f);
+    T(color.a == 0.0f);
+    shutdown();
+}
+
+UTEST(sokol_spine, anim_by_name) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    sspine_anim a0 = sspine_anim_by_name(skeleton, "hoverboard");
+    T((a0.skeleton_id == skeleton.id) && (a0.index == 2));
+    sspine_anim a1 = sspine_anim_by_name(skeleton, "bla");
+    T((a1.skeleton_id == 0) && (a1.index == 0));
+    shutdown();
+}
+
+UTEST(sokol_spine, anim_by_name_destroyed_instance) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    sspine_destroy_skeleton(skeleton);
+    sspine_anim a0 = sspine_anim_by_name(skeleton, "hoverboard");
+    T((a0.skeleton_id == 0) && (a0.index == 0));
+    shutdown();
+}
+
+UTEST(sokol_spine, anim_valid) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    T(sspine_anim_valid(sspine_anim_by_index(skeleton, 0)));
+    T(sspine_anim_valid(sspine_anim_by_index(skeleton, 10)));
+    T(!sspine_anim_valid(sspine_anim_by_index(skeleton, -1)));
+    T(!sspine_anim_valid(sspine_anim_by_index(skeleton, 11)));
+    sspine_destroy_skeleton(skeleton);
+    T(!sspine_anim_valid(sspine_anim_by_index(skeleton, 0)));
+    shutdown();
+}
+
+UTEST(sokol_spine, anim_equal) {
+    init();
+    T(sspine_anim_equal((sspine_anim){ 1, 2 }, (sspine_anim){ 1, 2 }));
+    T(!sspine_anim_equal((sspine_anim){ 2, 2 }, (sspine_anim){ 1, 2 }));
+    T(!sspine_anim_equal((sspine_anim){ 1, 3 }, (sspine_anim){ 1, 2 }));
+    shutdown();
+}
+
+UTEST(sokol_spine, num_anims) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    T(sspine_num_anims(skeleton) == 11);
+    sspine_destroy_skeleton(skeleton);
+    T(sspine_num_anims(skeleton) == 0);
+    shutdown();
+}
+
+UTEST(sokol_spine, get_anim_info) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    sspine_anim anim = sspine_anim_by_name(skeleton, "hoverboard");
+    const sspine_anim_info info = sspine_get_anim_info(anim);
+    T(info.valid);
+    T(info.index == 2);
+    T(strcmp(info.name.cstr, "hoverboard") == 0);
+    T(info.duration == 1.0f);
+    shutdown();
+}
+
+UTEST(sokol_spine, get_anim_info_destroyed_skeleton) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    sspine_anim anim = sspine_anim_by_name(skeleton, "hoverboard");
+    sspine_destroy_skeleton(skeleton);
+    const sspine_anim_info info = sspine_get_anim_info(anim);
+    T(!info.valid);
+    shutdown();
+}
+
+UTEST(sokol_spine, get_anim_info_invalid_index) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    const sspine_anim_info i0 = sspine_get_anim_info(sspine_anim_by_index(skeleton, -1));
+    T(!i0.valid);
+    T(!i0.name.valid);
+    const sspine_anim_info i1 = sspine_get_anim_info(sspine_anim_by_index(skeleton, 1234));
+    T(!i1.valid);
+    T(!i1.name.valid);
+    shutdown();
+}
+
+UTEST(sokol_spine, atlas_page_valid) {
+    init();
+    sspine_atlas atlas = create_atlas();
+    T(sspine_atlas_page_valid(sspine_atlas_page_by_index(atlas, 0)));
+    T(!sspine_atlas_page_valid(sspine_atlas_page_by_index(atlas, -1)));
+    T(!sspine_atlas_page_valid(sspine_atlas_page_by_index(atlas, 1)));
+    sspine_destroy_atlas(atlas);
+    T(!sspine_atlas_page_valid(sspine_atlas_page_by_index(atlas, 0)));
+    shutdown();
+}
+
+UTEST(sokol_spine, num_atlas_pages) {
+    init();
+    sspine_atlas atlas = create_atlas();
+    T(sspine_num_atlas_pages(atlas) == 1);
+    sspine_destroy_atlas(atlas);
+    T(sspine_num_atlas_pages(atlas) == 0);
+    shutdown();
+}
+
+UTEST(sokol_spine, get_atlas_page_info) {
+    init();
+    sspine_atlas atlas = create_atlas();
+    const sspine_atlas_page_info info = sspine_get_atlas_page_info(sspine_atlas_page_by_index(atlas, 0));
+    T(info.valid);
+    T(info.atlas.id == atlas.id);
+    T(info.image.valid);
+    T(info.image.sgimage.id != SG_INVALID_ID);
+    T(sg_query_image_state(info.image.sgimage) == SG_RESOURCESTATE_ALLOC);
+    T(strcmp(info.image.filename.cstr, "spineboy.png") == 0);
+    T(info.image.min_filter == SG_FILTER_LINEAR);
+    T(info.image.mag_filter == SG_FILTER_LINEAR);
+    T(info.image.wrap_u == SG_WRAP_MIRRORED_REPEAT);
+    T(info.image.wrap_v == SG_WRAP_MIRRORED_REPEAT);
+    T(info.image.width == 1024);
+    T(info.image.height == 256);
+    T(info.image.premul_alpha == false);
+    T(info.overrides.min_filter == _SG_FILTER_DEFAULT);
+    T(info.overrides.mag_filter == _SG_FILTER_DEFAULT);
+    T(info.overrides.wrap_u == _SG_WRAP_DEFAULT);
+    T(info.overrides.wrap_v == _SG_WRAP_DEFAULT);
+    T(!info.overrides.premul_alpha_enabled);
+    T(!info.overrides.premul_alpha_disabled);
+    shutdown();
+}
+
+UTEST(sokol_spine, get_atlas_page_info_destroyed_atlas) {
+    init();
+    sspine_atlas atlas = create_atlas();
+    sspine_destroy_atlas(atlas);
+    const sspine_atlas_page_info info = sspine_get_atlas_page_info(sspine_atlas_page_by_index(atlas, 0));
+    T(!info.valid);
+    T(info.atlas.id == SSPINE_INVALID_ID);
+    shutdown();
+}
+
+UTEST(sokol_spine, get_atlas_page_info_invalid_index) {
+    init();
+    sspine_atlas atlas = create_atlas();
+    sspine_destroy_atlas(atlas);
+    const sspine_atlas_page_info i0 = sspine_get_atlas_page_info(sspine_atlas_page_by_index(atlas, -1));
+    T(!i0.valid);
+    T(i0.atlas.id == SSPINE_INVALID_ID);
+    const sspine_atlas_page_info i1 = sspine_get_atlas_page_info(sspine_atlas_page_by_index(atlas, 1234));
+    T(!i0.valid);
+    T(i1.atlas.id == SSPINE_INVALID_ID);
+    shutdown();
+}
+
+UTEST(sokol_spine, atlas_get_atlas_page_info_with_overrides) {
+    init();
+    sspine_range atlas_data = load_data("spineboy.atlas");
+    sspine_atlas atlas = sspine_make_atlas(&(sspine_atlas_desc){
+        .data = atlas_data,
+        .override = {
+            .min_filter = SG_FILTER_NEAREST_MIPMAP_NEAREST,
+            .mag_filter = SG_FILTER_NEAREST,
+            .wrap_u = SG_WRAP_REPEAT,
+            .wrap_v = SG_WRAP_CLAMP_TO_EDGE,
+            .premul_alpha_enabled = true,
+        }
+    });
+    const sspine_atlas_page_info info = sspine_get_atlas_page_info(sspine_atlas_page_by_index(atlas, 0));
+    T(info.valid);
+    T(info.atlas.id == atlas.id);
+    T(info.image.valid);
+    T(info.image.sgimage.id != SG_INVALID_ID);
+    T(sg_query_image_state(info.image.sgimage) == SG_RESOURCESTATE_ALLOC);
+    T(strcmp(info.image.filename.cstr, "spineboy.png") == 0);
+    T(info.image.min_filter == SG_FILTER_LINEAR);
+    T(info.image.mag_filter == SG_FILTER_LINEAR);
+    T(info.image.wrap_u == SG_WRAP_MIRRORED_REPEAT);
+    T(info.image.wrap_v == SG_WRAP_MIRRORED_REPEAT);
+    T(info.image.width == 1024);
+    T(info.image.height == 256);
+    T(info.image.premul_alpha == true); // FIXME: hmm, this is actually inconsistent
+    T(info.overrides.min_filter == SG_FILTER_NEAREST_MIPMAP_NEAREST);
+    T(info.overrides.mag_filter == SG_FILTER_NEAREST);
+    T(info.overrides.wrap_u == SG_WRAP_REPEAT);
+    T(info.overrides.wrap_v == SG_WRAP_CLAMP_TO_EDGE);
+    T(info.overrides.premul_alpha_enabled);
+    T(!info.overrides.premul_alpha_disabled);
+    shutdown();
+}
+
+UTEST(sokol_spine, bone_by_name) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    sspine_bone b0 = sspine_bone_by_name(skeleton, "crosshair");
+    T((b0.skeleton_id == skeleton.id) && (b0.index == 2));
+    sspine_bone b1 = sspine_bone_by_name(skeleton, "blablub");
+    T((b1.skeleton_id == 0) && (b1.index == 0));
+    shutdown();
+}
+
+UTEST(sokol_spine, bone_by_name_destroyed_skeleton) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    sspine_destroy_skeleton(skeleton);
+    sspine_bone b0 = sspine_bone_by_name(skeleton, "crosshair");
+    T((b0.skeleton_id == 0) && (b0.index == 0));
+    shutdown();
+}
+
+UTEST(sokol_spine, bone_valid) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    T(sspine_bone_valid(sspine_bone_by_index(skeleton, 0)));
+    T(sspine_bone_valid(sspine_bone_by_index(skeleton, 66)));
+    T(!sspine_bone_valid(sspine_bone_by_index(skeleton, -1)));
+    T(!sspine_bone_valid(sspine_bone_by_index(skeleton, 67)));
+    sspine_destroy_skeleton(skeleton);
+    T(!sspine_bone_valid(sspine_bone_by_index(skeleton, 0)));
+    shutdown();
+}
+
+UTEST(sokol_spine, bone_equal) {
+    init();
+    T(sspine_bone_equal((sspine_bone){ 1, 2 }, (sspine_bone){ 1, 2 }));
+    T(!sspine_bone_equal((sspine_bone){ 2, 2 }, (sspine_bone){ 1, 2 }));
+    T(!sspine_bone_equal((sspine_bone){ 1, 3 }, (sspine_bone){ 1, 2 }));
+    shutdown();
+}
+
+UTEST(sokol_spine, num_bones) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    T(sspine_num_bones(skeleton) == 67);
+    sspine_destroy_skeleton(skeleton);
+    T(sspine_num_bones(skeleton) == 0);
+    shutdown();
+}
+
+UTEST(sokol_spine, get_bone_info_root) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    const sspine_bone_info info = sspine_get_bone_info(sspine_bone_by_name(skeleton, "root"));
+    T(info.valid);
+    T(info.index == 0);
+    T((info.parent_bone.skeleton_id == 0) && (info.parent_bone.index == 0));
+    T(strcmp(info.name.cstr, "root") == 0);
+    T(info.length == 0.0f);
+    T(info.pose.position.x == 0.0f);
+    T(info.pose.position.y == 0.0f);
+    T(info.pose.rotation == 0.05f);
+    T(info.pose.scale.x == 1.0f);
+    T(info.pose.scale.y == 1.0f);
+    T(info.pose.shear.x == 0.0f);
+    T(info.pose.shear.y == 0.0f);
+    shutdown();
+}
+
+UTEST(sokol_spine, get_bone_info_parent_bone) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    const sspine_bone_info info = sspine_get_bone_info(sspine_bone_by_name(skeleton, "rear-shin"));
+    T(info.valid);
+    T(info.index == 7);
+    T((info.parent_bone.skeleton_id == skeleton.id) && (info.parent_bone.index == 6));
+    shutdown();
+}
+
+UTEST(sokol_spine, get_bone_info_destroyed_skeleton) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    sspine_bone bone = sspine_bone_by_name(skeleton, "root");
+    sspine_destroy_skeleton(skeleton);
+    const sspine_bone_info info = sspine_get_bone_info(bone);
+    T(!info.valid);
+    T(!info.name.valid);
+    shutdown();
+}
+
+UTEST(sokol_spine, get_bone_info_invalid_index) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    const sspine_bone_info i0 = sspine_get_bone_info(sspine_bone_by_index(skeleton, -1));
+    T(!i0.valid);
+    T(!i0.name.valid);
+    const sspine_bone_info i1 = sspine_get_bone_info(sspine_bone_by_index(skeleton, 1234));
+    T(!i1.valid);
+    T(!i1.name.valid);
+    shutdown();
+}
+
+UTEST(sokol_spine, set_get_bone_transform) {
+    init();
+    sspine_instance instance = create_instance();
+    sspine_skeleton skeleton = sspine_get_instance_skeleton(instance);
+    sspine_bone bone = sspine_bone_by_name(skeleton, "root");
+    sspine_set_bone_transform(instance, bone, &(sspine_bone_transform){
+        .position = { 1.0f, 2.0f },
+        .rotation = 3.0f,
+        .scale = { 4.0f, 5.0f },
+        .shear = { 6.0f, 7.0f }
+    });
+    const sspine_bone_transform tform = sspine_get_bone_transform(instance, bone);
+    T(tform.position.x == 1.0f);
+    T(tform.position.y == 2.0f);
+    T(tform.rotation == 3.0f);
+    T(tform.scale.x == 4.0f);
+    T(tform.scale.y == 5.0f);
+    T(tform.shear.x == 6.0f);
+    T(tform.shear.y == 7.0f);
+    shutdown();
+}
+
+UTEST(sokol_spine, set_get_bone_transform_destroyed_instance) {
+    init();
+    sspine_instance instance = create_instance();
+    sspine_skeleton skeleton = sspine_get_instance_skeleton(instance);
+    sspine_bone bone = sspine_bone_by_name(skeleton, "root");
+    sspine_destroy_instance(instance);
+    sspine_set_bone_transform(instance, bone, &(sspine_bone_transform){
+        .position = { 1.0f, 2.0f },
+        .rotation = 3.0f,
+        .scale = { 4.0f, 5.0f },
+        .shear = { 6.0f, 7.0f }
+    });
+    const sspine_bone_transform tform = sspine_get_bone_transform(instance, bone);
+    T(tform.position.x == 0.0f);
+    T(tform.position.y == 0.0f);
+    T(tform.rotation == 0.0f);
+    T(tform.scale.x == 0.0f);
+    T(tform.scale.y == 0.0f);
+    T(tform.shear.x == 0.0f);
+    T(tform.shear.y == 0.0f);
+    shutdown();
+}
+
+UTEST(sokol_spine, set_get_bone_position) {
+    init();
+    sspine_instance instance = create_instance();
+    sspine_skeleton skeleton = sspine_get_instance_skeleton(instance);
+    sspine_bone bone = sspine_bone_by_name(skeleton, "root");
+    sspine_set_bone_position(instance, bone, (sspine_vec2){ 1.0f, 2.0f });
+    const sspine_vec2 p0 = sspine_get_bone_position(instance, bone);
+    T(p0.x == 1.0f);
+    T(p0.y == 2.0f);
+    sspine_destroy_instance(instance);
+    const sspine_vec2 p1 = sspine_get_bone_position(instance, bone);
+    T(p1.x == 0.0f);
+    T(p1.y == 0.0f);
+    shutdown();
+}
+
+UTEST(sokol_spine, set_get_bone_rotation) {
+    init();
+    sspine_instance instance = create_instance();
+    sspine_skeleton skeleton = sspine_get_instance_skeleton(instance);
+    sspine_bone bone = sspine_bone_by_name(skeleton, "root");
+    sspine_set_bone_rotation(instance, bone, 5.0f);
+    T(sspine_get_bone_rotation(instance, bone) == 5.0f);
+    sspine_destroy_instance(instance);
+    T(sspine_get_bone_rotation(instance, bone) == 0.0f);
+    shutdown();
+}
+
+UTEST(sokol_spine, set_get_bone_scale) {
+    init();
+    sspine_instance instance = create_instance();
+    sspine_skeleton skeleton = sspine_get_instance_skeleton(instance);
+    sspine_bone bone = sspine_bone_by_name(skeleton, "root");
+    sspine_set_bone_scale(instance, bone, (sspine_vec2){ 1.0f, 2.0f });
+    const sspine_vec2 s0 = sspine_get_bone_scale(instance, bone);
+    T(s0.x == 1.0f);
+    T(s0.y == 2.0f);
+    sspine_destroy_instance(instance);
+    const sspine_vec2 s1 = sspine_get_bone_scale(instance, bone);
+    T(s1.x == 0.0f);
+    T(s1.y == 0.0f);
+    shutdown();
+}
+
+UTEST(sokol_spine, set_get_bone_shear) {
+    init();
+    sspine_instance instance = create_instance();
+    sspine_skeleton skeleton = sspine_get_instance_skeleton(instance);
+    sspine_bone bone = sspine_bone_by_name(skeleton, "root");
+    sspine_set_bone_shear(instance, bone, (sspine_vec2){ 1.0f, 2.0f });
+    const sspine_vec2 s0 = sspine_get_bone_shear(instance, bone);
+    T(s0.x == 1.0f);
+    T(s0.y == 2.0f);
+    sspine_destroy_instance(instance);
+    const sspine_vec2 s1 = sspine_get_bone_shear(instance, bone);
+    T(s1.x == 0.0f);
+    T(s1.y == 0.0f);
+    shutdown();
+}
+
+UTEST(sokol_spine, slot_by_name) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    sspine_slot s0 = sspine_slot_by_name(skeleton, "portal-streaks1");
+    T((s0.skeleton_id == skeleton.id) && (s0.index == 3));
+    sspine_slot s1 = sspine_slot_by_name(skeleton, "blablub");
+    T((s1.skeleton_id == 0) && (s1.index == 0));
+    shutdown();
+}
+
+UTEST(sokol_spine, slot_by_name_destroyed_skeleton) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    sspine_destroy_skeleton(skeleton);
+    sspine_slot s0 = sspine_slot_by_name(skeleton, "portal-streaks1");
+    T((s0.skeleton_id == 0) && (s0.index == 0));
+    shutdown();
+}
+
+UTEST(sokol_spine, num_slots) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    T(sspine_num_slots(skeleton) == 52);
+    sspine_destroy_skeleton(skeleton);
+    T(sspine_num_slots(skeleton) == 0);
+    shutdown();
+}
+
+UTEST(sokol_spine, slot_valid) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    T(sspine_slot_valid(sspine_slot_by_index(skeleton, 0)));
+    T(sspine_slot_valid(sspine_slot_by_index(skeleton, 51)));
+    T(!sspine_slot_valid(sspine_slot_by_index(skeleton, -1)));
+    T(!sspine_slot_valid(sspine_slot_by_index(skeleton, 52)));
+    sspine_destroy_skeleton(skeleton);
+    T(!sspine_slot_valid(sspine_slot_by_index(skeleton, 0)));
+    shutdown();
+}
+
+UTEST(sokol_spine, slot_equal) {
+    init();
+    T(sspine_slot_equal((sspine_slot){ 1, 2 }, (sspine_slot){ 1, 2 }));
+    T(!sspine_slot_equal((sspine_slot){ 2, 2 }, (sspine_slot){ 1, 2 }));
+    T(!sspine_slot_equal((sspine_slot){ 1, 3 }, (sspine_slot){ 1, 2 }));
+    shutdown();
+}
+
+UTEST(sokol_spine, get_slot_info) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    const sspine_slot_info info = sspine_get_slot_info(sspine_slot_by_name(skeleton, "portal-streaks1"));
+    T(info.valid);
+    T(info.index == 3);
+    T(strcmp(info.name.cstr, "portal-streaks1") == 0);
+    T(!info.attachment_name.valid);
+    T((info.bone.skeleton_id == skeleton.id) && (info.bone.index == 62));
+    T(info.color.r == 1.0f);
+    T(info.color.g == 1.0f);
+    T(info.color.b == 1.0f);
+    T(info.color.a == 1.0f);
+    shutdown();
+}
+
+UTEST(sokol_spine, get_slot_info_destroyed_skeleton) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    sspine_slot slot = sspine_slot_by_name(skeleton, "portal-streaks1");
+    sspine_destroy_skeleton(skeleton);
+    const sspine_slot_info info = sspine_get_slot_info(slot);
+    T(!info.valid);
+    T(!info.name.valid);
+    shutdown();
+}
+
+UTEST(sokol_spine, get_slot_info_invalid_index) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    const sspine_slot_info i0 = sspine_get_slot_info(sspine_slot_by_index(skeleton, -1));
+    T(!i0.valid);
+    T(!i0.name.valid);
+    const sspine_slot_info i1 = sspine_get_slot_info(sspine_slot_by_index(skeleton, 1234));
+    T(!i1.valid);
+    T(!i1.name.valid);
+    shutdown();
+}
+
+UTEST(sokol_spine, set_get_slot_color) {
+    init();
+    sspine_instance instance = create_instance();
+    sspine_skeleton skeleton = sspine_get_instance_skeleton(instance);
+    sspine_slot slot = sspine_slot_by_name(skeleton, "portal-streaks1");
+    sspine_set_slot_color(instance, slot, (sspine_color){ 1.0f, 2.0f, 3.0f, 4.0f });
+    const sspine_color color = sspine_get_slot_color(instance, slot);
+    T(color.r == 1.0f);
+    T(color.g == 2.0f);
+    T(color.b == 3.0f);
+    T(color.a == 4.0f);
+    const sspine_slot_info info = sspine_get_slot_info(slot);
+    T(info.color.r == 1.0f);
+    T(info.color.g == 1.0f);
+    T(info.color.b == 1.0f);
+    T(info.color.a == 1.0f);
+    shutdown();
+}
+
+UTEST(sokol_spine, event_by_name) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    sspine_event e0 = sspine_event_by_name(skeleton, "footstep");
+    T((e0.skeleton_id == skeleton.id) && (e0.index == 0));
+    sspine_event e1 = sspine_event_by_name(skeleton, "bla");
+    T((e1.skeleton_id == 0) && (e1.index == 0));
+    shutdown();
+}
+
+UTEST(sokol_spine, event_by_name_destroyed_skeleton) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    sspine_destroy_skeleton(skeleton);
+    sspine_event e0 = sspine_event_by_name(skeleton, "footstep");
+    T((e0.skeleton_id == 0) && (e0.index == 0));
+    shutdown();
+}
+
+UTEST(sokol_spine, event_valid) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    T(sspine_event_valid(sspine_event_by_index(skeleton, 0)));
+    T(!sspine_event_valid(sspine_event_by_index(skeleton, 1)));
+    T(!sspine_event_valid(sspine_event_by_index(skeleton, -1)));
+    sspine_destroy_skeleton(skeleton);
+    T(!sspine_event_valid(sspine_event_by_index(skeleton, 0)));
+    shutdown();
+}
+
+UTEST(sokol_spine, event_equal) {
+    init();
+    T(sspine_event_equal((sspine_event){ 1, 2 }, (sspine_event){ 1, 2 }));
+    T(!sspine_event_equal((sspine_event){ 2, 2 }, (sspine_event){ 1, 2 }));
+    T(!sspine_event_equal((sspine_event){ 1, 3 }, (sspine_event){ 1, 2 }));
+    shutdown();
+}
+
+UTEST(sokol_spine, num_events) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    T(sspine_num_events(skeleton) == 1);
+    sspine_destroy_skeleton(skeleton);
+    T(sspine_num_events(skeleton) == 0);
+    shutdown();
+}
+
+UTEST(sokol_spine, get_event_info) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    const sspine_event_info info = sspine_get_event_info(sspine_event_by_index(skeleton, 0));
+    T(info.valid);
+    T(0 == strcmp(info.name.cstr, "footstep"));
+    T(0 == info.index);
+    T(0 == info.int_value);
+    T(0.0f == info.float_value);
+    T(!info.string_value.valid);
+    T(!info.audio_path.valid);
+    T(0.0f == info.volume);
+    T(0.0f == info.balance);
+    shutdown();
+}
+
+UTEST(sokol_spine, get_event_info_destroyed_skeleton) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    sspine_destroy_skeleton(skeleton);
+    const sspine_event_info info = sspine_get_event_info(sspine_event_by_index(skeleton, 0));
+    T(!info.valid);
+    T(!info.name.valid);
+    shutdown();
+}
+
+UTEST(sokol_spine, iktarget_by_name) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    sspine_iktarget ik0 = sspine_iktarget_by_name(skeleton, "board-ik");
+    T((ik0.skeleton_id == skeleton.id) && (ik0.index == 2));
+    sspine_iktarget ik1 = sspine_iktarget_by_name(skeleton, "bla");
+    T((ik1.skeleton_id == 0) && (ik1.index == 0));
+    shutdown();
+}
+
+UTEST(sokol_spine, iktarget_by_name_destroyed_skeleton) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    sspine_destroy_skeleton(skeleton);
+    sspine_iktarget ik0 = sspine_iktarget_by_name(skeleton, "board-ik");
+    T((ik0.skeleton_id == 0) && (ik0.index == 0));
+    shutdown();
+}
+
+UTEST(sokol_spine, iktarget_valid) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    T(sspine_iktarget_valid(sspine_iktarget_by_index(skeleton, 0)));
+    T(sspine_iktarget_valid(sspine_iktarget_by_index(skeleton, 6)));
+    T(!sspine_iktarget_valid(sspine_iktarget_by_index(skeleton, -1)));
+    T(!sspine_iktarget_valid(sspine_iktarget_by_index(skeleton, 7)));
+    sspine_destroy_skeleton(skeleton);
+    T(!sspine_iktarget_valid(sspine_iktarget_by_index(skeleton, 0)));
+    shutdown();
+}
+
+UTEST(sokol_spine, iktarget_equal) {
+    init();
+    T(sspine_iktarget_equal((sspine_iktarget){ 1, 2 }, (sspine_iktarget){ 1, 2 }));
+    T(!sspine_iktarget_equal((sspine_iktarget){ 2, 2 }, (sspine_iktarget){ 1, 2 }));
+    T(!sspine_iktarget_equal((sspine_iktarget){ 1, 3 }, (sspine_iktarget){ 1, 2 }));
+    shutdown();
+}
+
+UTEST(sokol_spine, num_iktargets) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    T(sspine_num_iktargets(skeleton) == 7);
+    sspine_destroy_skeleton(skeleton);
+    T(sspine_num_iktargets(skeleton) == 0);
+    shutdown();
+}
+
+UTEST(sokol_spine, get_iktarget_info) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    const sspine_iktarget_info info = sspine_get_iktarget_info(sspine_iktarget_by_index(skeleton, 1));
+    T(info.valid);
+    T(1 == info.index);
+    T(0 == strcmp(info.name.cstr, "aim-torso-ik"));
+    T((info.target_bone.skeleton_id == skeleton.id) && (info.target_bone.index == 2));
+    shutdown();
+}
+
+UTEST(sokol_spine, get_iktarget_info_destroyed_skeleton) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    sspine_destroy_skeleton(skeleton);
+    const sspine_iktarget_info info = sspine_get_iktarget_info(sspine_iktarget_by_index(skeleton, 1));
+    T(!info.valid);
+    T(!info.name.valid);
+    shutdown();
+}
+
+UTEST(sokol_spine, get_iktarget_info_out_of_bounds) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    sspine_destroy_skeleton(skeleton);
+    const sspine_iktarget_info info0 = sspine_get_iktarget_info(sspine_iktarget_by_index(skeleton, -1));
+    T(!info0.name.valid);
+    const sspine_iktarget_info info1 = sspine_get_iktarget_info(sspine_iktarget_by_index(skeleton, 7));
+    T(!info1.name.valid);
+    shutdown();
+}
+
+UTEST(sokol_spine, skin_by_name) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    sspine_skin s0 = sspine_skin_by_name(skeleton, "default");
+    T((s0.skeleton_id == skeleton.id) && (s0.index == 0));
+    sspine_skin s1 = sspine_skin_by_name(skeleton, "bla");
+    T((s1.skeleton_id == 0) && (s1.index == 0));
+    sspine_destroy_skeleton(skeleton);
+    sspine_skin s2 = sspine_skin_by_name(skeleton, "default");
+    T((s2.skeleton_id == 0) && (s2.index == 0));
+    shutdown();
+}
+
+UTEST(sokol_spine, skin_valid) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    T(sspine_skin_valid(sspine_skin_by_index(skeleton, 0)));
+    T(!sspine_skin_valid(sspine_skin_by_index(skeleton, -1)));
+    T(!sspine_skin_valid(sspine_skin_by_index(skeleton, 1)));
+    sspine_destroy_skeleton(skeleton);
+    T(!sspine_skin_valid(sspine_skin_by_index(skeleton, 0)));
+    shutdown();
+}
+
+UTEST(sokol_spine, skin_equal) {
+    init();
+    T(sspine_skin_equal((sspine_skin){ 1, 2 }, (sspine_skin){ 1, 2 }));
+    T(!sspine_skin_equal((sspine_skin){ 2, 2 }, (sspine_skin){ 1, 2 }));
+    T(!sspine_skin_equal((sspine_skin){ 1, 3 }, (sspine_skin){ 1, 2 }));
+    shutdown();
+}
+
+UTEST(sokol_spine, num_skins) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    T(sspine_num_skins(skeleton) == 1);
+    sspine_destroy_skeleton(skeleton);
+    T(sspine_num_skins(skeleton) == 0);
+    shutdown();
+}
+
+UTEST(sokol_spine, get_skin_info) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    const sspine_skin_info info = sspine_get_skin_info(sspine_skin_by_index(skeleton, 0));
+    T(info.valid);
+    T(0 == info.index);
+    T(0 == strcmp(info.name.cstr, "default"));
+    shutdown();
+}
+
+UTEST(sokol_spine, get_skin_info_destroyed_skeleton) {
+    init();
+    sspine_skeleton skeleton = create_skeleton();
+    sspine_destroy_skeleton(skeleton);
+    const sspine_skin_info info = sspine_get_skin_info(sspine_skin_by_index(skeleton, 0));
+    T(!info.valid);
+    T(!info.name.valid);
+    shutdown();
+}

+ 3 - 0
tests/test_common.sh

@@ -2,6 +2,9 @@ prepare() {
     if [ ! -d "ext/fips-cimgui" ] ; then
         git clone --depth 1 --recursive https://github.com/fips-libs/fips-cimgui ext/fips-cimgui
     fi
+    if [ ! -d "ext/spine-runtimes" ] ; then
+        git clone --depth 1 --recursive https://github.com/EsotericSoftware/spine-runtimes/ ext/spine-runtimes
+    fi
 }
 
 setup_emsdk() {

+ 3 - 2
tests/test_uwp.cmd

@@ -1,6 +1,9 @@
 if not exist ext/fips-cimgui/ (
     git clone --depth 1 --recursive https://github.com/fips-libs/fips-cimgui ext/fips-cimgui
 )
+if not exist ext/spine-runtimes/ (
+    git clone --depth 1 --recursive https://github.com/EsotericSoftware/spine-runtimes/ ext/spine-runtimes
+)
 
 md build\win_uwp_debug
 cd build\win_uwp_debug
@@ -13,5 +16,3 @@ cd build\win_uwp_release
 cmake -DSOKOL_BACKEND=SOKOL_D3D11 -DCMAKE_SYSTEM_NAME=WindowsStore -DCMAKE_SYSTEM_VERSION=10.0.19041.0 ../.. || exit /b 10
 cmake --build . --config Release || exit /b 10
 cd ..\..
-
-

+ 3 - 0
tests/test_win.cmd

@@ -1,6 +1,9 @@
 if not exist ext/fips-cimgui/ (
     git clone --depth 1 --recursive https://github.com/fips-libs/fips-cimgui ext/fips-cimgui
 )
+if not exist ext/spine-runtimes/ (
+    git clone --depth 1 --recursive https://github.com/EsotericSoftware/spine-runtimes/ ext/spine-runtimes
+)
 
 md build\win_gl_debug
 cd build\win_gl_debug

+ 5666 - 0
util/sokol_spine.h

@@ -0,0 +1,5666 @@
+#if defined(SOKOL_IMPL) && !defined(SOKOL_SPINE_IMPL)
+#define SOKOL_SPINE_IMPL
+#endif
+#ifndef SOKOL_SPINE_INCLUDED
+/*
+    sokol_spine.h -- a sokol-gfx renderer for the spine-c runtime
+                     (see https://github.com/EsotericSoftware/spine-runtimes/tree/4.1/spine-c)
+
+    Project URL: https://github.com/floooh/sokol
+
+    Do this:
+        #define SOKOL_IMPL or
+        #define SOKOL_SPINE_IMPL
+
+    before you include this file in *one* C or C++ file to create the
+    implementation.
+
+    The following defines are used by the implementation to select the
+    platform-specific embedded shader code (these are the same defines as
+    used by sokol_gfx.h and sokol_app.h):
+
+    SOKOL_GLCORE33
+    SOKOL_GLES2
+    SOKOL_GLES3
+    SOKOL_D3D11
+    SOKOL_METAL
+
+    ...optionally provide the following macros to override defaults:
+
+    SOKOL_ASSERT(c)     - your own assert macro (default: assert(c))
+    SOKOL_SPINE_API_DECL    - public function declaration prefix (default: extern)
+    SOKOL_API_DECL      - same as SOKOL_SPINE_API_DECL
+    SOKOL_API_IMPL      - public function implementation prefix (default: -)
+    SOKOL_UNREACHABLE() - a guard macro for unreachable code (default: assert(false))
+
+    If sokol_spine.h is compiled as a DLL, define the following before
+    including the declaration or implementation:
+
+    SOKOL_DLL
+
+    On Windows, SOKOL_DLL will define SOKOL_SPINE_API_DECL as __declspec(dllexport)
+    or __declspec(dllimport) as needed.
+
+    Include the following headers before including sokol_spine.h:
+
+        sokol_gfx.h
+
+    Include the following headers before include the sokol_spine.h *IMPLEMENTATION*:
+
+        spine/spine.h
+
+    You'll also need to compile and link with the spine-c runtime:
+
+        https://github.com/EsotericSoftware/spine-runtimes/tree/4.1/spine-c/spine-c
+
+
+    FEATURE OVERVIEW
+    ================
+    sokol_spine.h is a sokol-gfx renderer and 'handle wrapper' for Spine
+    (http://en.esotericsoftware.com/spine-in-depth) on top of the
+    spine-c runtime: http://en.esotericsoftware.com/spine-c (source code:
+    https://github.com/EsotericSoftware/spine-runtimes/tree/4.1/spine-c/spine-c).
+
+    The sokol-gfx renderer allows to manage multiple contexts for rendering
+    Spine scenes into different sokol-gfx render passes (similar to sokol-gl and
+    sokol-debugtext), allows to split rendering into layers to mix Spine
+    rendering with other rendering operations, and it automatically batches
+    adjacent draw calls for Spine objects that use the same texture and in the
+    same layer.
+
+    Sokol-spine wraps 'raw' spine-c objects with tagged index handles. This
+    eliminates the risk of memory corruption via dangling pointers. Any
+    API calls involving invalid objects either result in a no-op, or
+    in a proper error.
+
+    The sokol-spine API exposes four 'base object types', and a number of
+    'subobject types' which are owned by base objects.
+
+    Base object types are:
+
+    - sspine_atlas: A wrapper around a spine-c spAtlas object, each spAtlas
+      object owns at least one spAtlasPage object, and each spAtlasPage object
+      owns exactly one sokol-gfx image object.
+
+    - sspine_skeleton: A skeleton object requires an atlas object for creation,
+      and is a wrapper around one spine-c spSkeletonData and one
+      spAnimationStateData object.  both contain the shared static data for
+      individual spine instances
+
+    - sspine_instance: Instance objects are created from skeleton objects.
+      Instances are the objects that are actually getting rendered. Each instance
+      tracks its own transformation and animation state, but otherwise just
+      references shared data of the skeleton object it was created from. An
+      sspine_instance object is a wrapper around one spine-c spSkeleton,
+      spAnimationState and spSkeletonClipping object each.
+
+    - sspine_skinset: Skin-set objects are collections of skins which define
+      the look of an instance. Some Spine scenes consist of combinable skins
+      (for instance a human character could offer different skins for different
+      types of clothing, hats, scarfs, shirts, pants, and so on..., and a skin
+      set would represent a specific outfit).
+
+    Subobject types allow to inspect and manipulate Spine objects in more detail:
+
+    - sspine_anim: Each skeleton object usually offers animations which can
+      then be scheduled and mixed on an instance.
+
+    - sspine_bone: Bone objects are the hierarchical transform nodes of
+      a skeleton. The sokol-spine API allows both to inspect the shared
+      static bone attributes of an sspine_skeleton object, as well as
+      inspecting and manipulating the per-instance bone attributes
+      on an sspine_instance object.
+
+    - sspine_event: A running Spine animation may fire 'events' at certain
+      positions in time (for instance a 'footstep' event whenever a foot
+      hits the ground). Events can be used to play sound effects (or visual
+      effects) at the right time.
+
+    - sspine_iktarget: Allows to set the target position for a group of
+      bones controlled by inverse kinematics.
+
+    There's a couple of other subobject types which are mostly useful to
+    inspect the interior structure of skeletons. Those will be explained
+    in detail further down.
+
+    MINIMAL API USAGE OVERVIEW
+    ==========================
+    During initialization:
+
+        - call sspine_setup() after initializating sokol-gfx
+        - create an atlas object from a Spine atlas file with sspine_make_atlas()
+        - load and initialize the sokol-gfx image objects referenced by the atlas
+        - create a skeleton object from a Spine skeleton file with sspine_make_skeleton()
+        - create at least one instance object with sspine_make_instance()
+
+    In the frame loop, outside of sokol-gfx render passes:
+
+        - call sspine_new_frame() before any other sokol-spine function
+        - if needed, move instances around with sspine_set_position()
+        - if needed, schedule new animations with sspine_set_animation() and sspine_add_animation()
+        - each frame, advance the current instance animation state with sspine_update_instance()
+        - each frame, render instances with sspine_draw_instance_in_layer(), this just records
+          vertices, indices and draw commands into internal buffers, but does no actual
+          sokol-gfx rendering
+
+    In the frame loop, inside a sokol-gfx render pass:
+
+        - call sspine_draw_layer() to draw all previously recorded instances in a specific layer
+
+    On shutdown:
+
+        - call sspine_shutdown(), ideally before shutting down sokol-gfx
+
+    QUICKSTART STEP BY STEP
+    =======================
+    For a simple demo program using sokol_app.h, sokol_gfx.h and sokol_fetch.h,
+    see here: [TODO: add link to spine-simple-sapp wasm demo].
+
+    - sokol_spine.h must be included after sokol_gfx.h (this is true both
+      for the declaration and implementation):
+
+        #include "sokol_gfx.h"
+        #include "sokol_spine.h"
+
+    - ...and sokol_gfx.h must be initialized before sokol_spine.h:
+
+        sg_setup(&(sg_desc){ ... });
+        sspine_setup(&(sspine_desc){ ... });
+
+    - You can tweak the memory usage of sokol-spine by limiting or expanding the
+      maximum number of vertices, draw commands and pool sizes:
+
+        sspine_setup(&(sspine_desc){
+            .max_vertices = 1024,       // default: (1<<16) = 65536
+            .max_commands = 128,        // default: (1<<14) = 16384
+            .context_pool_size = 1,     // default: 4
+            .atlas_pool_size = 1,       // default: 64
+            .skeleton_pool_size = 1,    // default: 64
+            .skinset_pool_size = 1,     // default: 64
+            .instance_pool_size = 16,   // default: 1024
+        });
+
+      Sokol-spine uses 32-bit vertex-indices for rendering
+      (SG_INDEXTYPE_UINT32), so that the maximum number of Spine vertices
+      in a frame isn't limited to (1<<16).
+
+    - You can override the default memory allocation and
+      error logging functions, this is explained in detail further down:
+
+        sspine_setup(&(sspine_desc){
+            .allocator = { ... },
+            .logger = { ... }
+        });
+
+    - After initialization, the first thing you need is an sspine_atlas object.
+      Sokol-spine doesn't concern itself with file IO, it expects all external
+      data to be provided as pointer/size pairs:
+
+        sspine_atlas atlas = sspine_make_atlas(&(sspine_atlas_desc){
+            .data = {
+                .ptr = ...,  // pointer to Spine atlas file data in memory
+                .size = ..., // atlas file data size in bytes
+            }
+        });
+        assert(sspine_atlas_valid(atlas));
+
+      If you load the atlas data asynchronously, you can still run your
+      per-frame rendering code without waiting for the atlas data to be loaded
+      and the atlas to be created. This works because calling sokol-spine
+      functions with 'invalid' object handles is a valid no-op.
+
+    - Optionally you can override some or all of the atlas texture creation parameters:
+
+        sspine_atlas atlas = sspine_make_atlas(&(sspine_atlas_desc){
+            .data = { ... },
+            .overrides = {
+                .min_filter = SG_FILTER_NEAREST,
+                .mag_filter = SG_FILTER_NEAREST,
+                .wrap_u = SG_WRAP_MIRROR,
+                .wrap_v = SG_WRAP_MIRROR,
+                .premul_alpha_enabled = ...,
+                .premul_alpha_disabled = ...,
+            }
+        });
+
+    - The atlas file itself doesn't contain any texture data, it only contains
+      filenames of the required textures. Sokol-spine has already allocated
+      a sokol-gfx sg_image handle for each required texture, but the actual
+      texture loading and initialization must be performed by user code:
+
+        // iterate over atlas textures and initialize sokol-gfx image objects
+        // with existing handles
+        const int num = sspine_num_images(atlas);
+        for (int i = 0; i < num; i++) {
+            const sspine_image img = sspine_image_by_index(atlas, i);
+            const sspine_image_info img_info = sspine_get_image_info(img);
+            assert(img_info.valid);
+            assert(!img_info.filename.truncated);
+
+            // the filename is now in img_info.filename.cstr, 'somehow'
+            // load and decode the image data into memory, and then
+            // initialize the sokol-gfx image from the existing sg_image handle
+            // in img_info.sgimage:
+            sg_init_image(img_info.sgimage, &(sg_image_desc){
+                .width = ...,
+                .height = ...,
+                .pixel_format = ...,
+                .min_filter = img_info.min_filter,
+                .mag_filter = img_info.mag_filter,
+                .wrap_u = img_info.wrap_u,
+                .wrap_v = img_info.wrap_v,
+                .data.subimage[0][0] = {
+                    .ptr = ...,     // pointer to decoded image pixel data
+                    .size = ...,    // size of decoded image pixel data in bytes
+                }
+            });
+        }
+
+      If you load the image data asynchronously, you can still simply start rendering
+      before the image data is loaded. This works because sokol-gfx will silently drop
+      any rendering operations that involve 'incomplete' objects.
+
+    - Once an atlas object has been created (independently from loading any image data),
+      an sspine_skeleton object is needed next. This requires a valid atlas object
+      handle as input, and a pointer to the Spine skeleton file data loaded into memory.
+
+      Spine skeleton files come in two flavours: binary or json, for binary data,
+      a ptr/size pair must be provided:
+
+        sspine_skeleton skeleton = sspine_make_skeleton(&(sspine_skeleton_desc){
+            .atlas = atlas,     // atlas must be a valid sspine_atlas handle
+            .binary_data = {
+                .ptr = ...,     // pointer to binary skeleton data in memory
+                .size = ...,    // size of binary skeleton data in bytes
+            }
+        });
+        assert(sspine_skeleton_valid(skeleton));
+
+      For JSON skeleton file data, the data must be provided as a zero-terminated C string:
+
+        sspine_skeleton skeleton = sspine_make_skeleton(&(sspine_skeleton_desc){
+            .atlas = atlas,
+            .json_data = ...,   // JSON skeleton data as zero-terminated(!) C-string
+        });
+
+      Like with all sokol-spine objects, if you load the skeleton data asynchronously
+      and only then create a skeleton object, you can already start rendering before
+      the data is loaded and the Spine objects have been created. Any operations
+      involving 'incomplete' handles will be dropped.
+
+    - You can pre-scale the Spine scene size, and you can provide a default cross-fade
+      duration for animation mixing:
+
+        sspine_skeleton skeleton = sspine_make_skeleton(&(sspine_skeleton_desc){
+            .atlas = atlas,
+            .binary_data = { ... },
+            .prescale = 0.5f,           // scale to half-size
+            .anim_default_mix = 0.2f,   // default anim mixing cross-fade duration 0.2 seconds
+        });
+
+    - Once the skeleton object has been created, it's finally time to create one or many instance objects.
+      If you want to independently render and animate the 'same' Spine object many times in a frame,
+      you should only create one sspine_skeleton object, and then as many sspine_instance object
+      as needed from the shared skeleton object:
+
+        sspine_instance instance = sspine_make_instance(&(sspine_instance_desc){
+            .skeleton = skeleton,   // must be a valid skeleton handle
+        });
+        assert(sspine_instance_valid(instance));
+
+      After creation, the sspine_instance will have a 'default skin' set as its appearance.
+
+    - To set the position of an instance:
+
+        sspine_set_position(inst, (sspine_vec2){ .x=..., .y=... });
+
+      Sokol-spine doesn't define a specific unit (like pixels or meters), instead the
+      rendering coordinate system is defined later at 'render time'.
+
+    - To schedule an initial looping animation by its name:
+
+        // first lookup up the animation by name on the skeleton:
+        sspine_anim anim = sspine_anim_by_name(skeleton, "walk");
+        assert(sspine_anim_valid(anim));
+
+        // then schedule the animation on the instance, on mixer track 0, as looping:
+        sspine_set_animation(instance, anim, 0, true);
+
+      Scheduling and mixing animations will be explained in more detail further down.
+
+    - IMPORTANT: at the start of a frame, before calling any other per-frame sokol-spine
+      functions, you *must* call:
+
+        sspine_new_frame()
+
+      This advances an internal frame counter which is important for updating
+      recorded vertex- and index-data exactly once per frame, and to rewind
+      internal vertex-, index- and command buffers. Failing to do so may result
+      in the internal buffers running full, resulting in faulty or missing
+      rendering operations.
+
+    - To advance and mix instance animations:
+
+        sspine_update_instance(instance, delta_time_in_seconds);
+
+      Usually you'd call this each frame for each active instance with the
+      frame duration in seconds.
+
+    - Now it's finally time to 'render' the instance at its current position and
+      animation state:
+
+        sspine_draw_instance_in_layer(instance, 0);
+
+      Instances are generally rendered into numbered virtual 'render layers' (in this
+      case, layer 0). Layers are useful for interleaving sokol-spine rendering
+      with other rendering commands (like background and foreground tile maps,
+      sprites or text).
+
+    - It's important to note that no actual sokol-gfx rendering happens in
+      sspine_draw_instance_in_layer(), instead only vertices, indices and
+      draw commands are recorded into internal memory buffes.
+
+    - The only sokol-spine function which *must* (and should) be called inside
+      a sokol-gfx rendering pass is sspine_draw_layer().
+
+      This renders all draw commands that have been recorded previously in a
+      specific layer via sspine_draw_instance_in_layer().
+
+        const sspine_layer_transform tform = { ... };
+
+        sg_begin_default_pass(...);
+        sspine_draw_layer(0, tform);
+        sg_end_pass();
+        sg_commit();
+
+      IMPORTANT: DO *NOT* MIX any calls to sspine_draw_instance_in_layer()
+      with sspine_draw_layer(), as this will confuse the internal draw command
+      recording. Ideally, move all sokol-gfx pass rendering (including all
+      sspine_draw_layer() calls) towards the end of the frame, separate from
+      any other sokol-spine calls.
+
+      The sspine_layer_transform struct defines the layer's screen space coordinate
+      system. For instance to map Spine coordinates to framebuffer pixels, with the
+      origin in the screen center, you'd setup the layer transform like this:
+
+        const float width = sapp_widthf();
+        const float height = sapp_heightf();
+        const sspine_layer_transform tform = {
+            .size = { .x = width, .y = height },
+            .origin = { .x = width * 0.5f, .y = height * 0.5f },
+        };
+
+      With this pixel mapping, the Spine scene would *not* scale with window size,
+      which often is not very useful. Instead it might make more sense to render
+      to a fixed 'virtual' resolution, for instance 1024 * 768:
+
+        const sspine_layer_transform tform = {
+            .size = { .x = 1024.0f, .y = 768.0f },
+            .origin = { .x = 512.0f, .y = 384.0f },
+        };
+
+      How to configure a virtual resolution with a fixed aspect ratio is
+      left as an exercise to the reader ;)
+
+    - That's it for basic sokol-spine setup and rendering. Any existing objects
+      will automatically be cleaned up when calling sspine_shutdown(), this
+      should be called before shutting down sokol-gfx, but this is not required:
+
+        sspine_shutdown();
+        sg_shutdown();
+
+    - You can explicitely destroy the base object types if you don't need them
+      any longer. This will cause the underlying spine-c objects to be
+      freed and the memory to be returned to the operating system:
+
+        sspine_destroy_instance(instance);
+        sspine_destroy_skinset(skinset);
+        sspine_destroy_skeleton(skeleton);
+        sspine_destroy_atlas(atlas);
+
+      You can destroy these objects in any order without causing memory corruption
+      issues. Instead any dependent object handles will simply become invalid (e.g.
+      if you destroy an atlas object, all skeletons and instances created from
+      this atlas will 'technically' still exist, but their handles will resolve to
+      'invalid' and all sokol-spine calls involving these handles will silently fail).
+
+      For instance:
+
+        // create an atlas, skeleton and instance
+        sspine_atlas atlas = sspine_make_atlas(&(sspine_atlas_desc){ ... });
+        assert(sspine_atlas_valid(atlas));
+
+        sspine_skeleton skeleton = sspine_make_skeleton(&(sspine_skeleton_desc){
+            .atlas = atlas,
+            ...
+        });
+        assert(sspine_skeleton_valid(skeleton));
+
+        sspine_instance instance = sspine_make_instance(&(sspine_instance_desc){
+            .skeleton = skeleton,
+        });
+        assert(sspine_instance_valid(instance));
+
+        // destroy the atlas object:
+        sspine_destroy_atlas(atlas);
+
+        // the skeleton and instance handle should now be invalid, but
+        // otherwise, nothing bad will happen:
+        if (!sspine_skeleton_valid(skeleton)) {
+            ...
+        }
+        if (!sspine_instance_valid(instance)) {
+            ...
+        }
+
+    RENDERER DETAILS
+    ================
+    Any rendering related work happens in the functions sspine_draw_instance_in_layer() and
+    sspine_draw_layer().
+
+    sspine_draw_instance_in_layer() will result in vertices, indices and internal
+    draw commands which will be recorded into internal memory buffers (e.g.
+    no sokol-gfx functions will be called here).
+
+    If possible, batching will be performed by merging a new draw command with
+    the previously recorded draw command. For two draw commands to be merged,
+    the following conditions must be tru:
+
+        - rendering needs to go into the same layer
+        - the same atlas texture must be used
+        - the blend mode must be compatible (the Spine blending modes
+          'normal' and 'additive' can be merged, but not 'multiply')
+        - the same premultiplied alpha mode must be used
+
+    To make the most out of batching:
+
+        - use Spine objects which only have a single atlas texture
+          and blend mode across all slots
+        - group sspine_draw_instance_in_layer() calls by layer
+
+    After all instances have been 'rendered' (or rather: recorded) into layers,
+    the actually rendering happens inside a sokol-gfx pass by calling the
+    function sspine_draw_layer() for each layer in 'z order' (e.g. the layer
+    index doesn't matter for z-ordering, only the order how sspine_draw_layer() is
+    called).
+
+    Only the first call to sspine_draw_layer() in a frame will copy the recorded
+    vertices and indices into sokol-gfx buffers.
+
+    Each call to sspine_draw_layer() will iterate over all recorded (and
+    hopefully well-batched) draw commands, skip any draw commands with a
+    non-matching layer index, and draw only those with a matching layer by
+    calling:
+
+        - if the pipeline object has changed:
+            - sg_apply_pipeline()
+            - sg_apply_uniforms() for the vertex stage
+        - if the atlas texture has changed:
+            - sg_apply_bindings()
+        - if the premultiplied-alpha mode has changed:
+            - sg_apply_uniforms() for the fragment stage
+        - and finally sg_draw()
+
+    The main purpose of render layers is to mix Spine rendering with other
+    render operations. In the not too distant future, the same render layer idea
+    will also be implemented at least for sokol-gl and sokol-debugtext.
+
+    FIXME: does this section need more details about layer transforms?
+
+    RENDERING WITH CONTEXTS
+    =======================
+    At first glance, render contexts may look like more heavy-weight
+    render layers, but they serve a different purpose: they are useful
+    if Spine rendering needs to happen in different sokol-gfx render passes
+    with different pixel formats and MSAA sample counts.
+
+    All Spine rendering happens within a context, even you don't call any
+    of the context API functions, in this case, an internal 'default context'
+    will be used.
+
+    Each context has its own internal vertex-, index- and command buffer and
+    all context state is completely independent from any other contexts.
+
+    To create a new context object, call:
+
+        sspine_context ctx = sspine_make_context(&(sspine_context_desc){
+            .max_vertices = ...,
+            .max_commands = ...,
+            .color_format = SG_PIXELFORMAT_...,
+            .depth_format = SG_PIXELFORMAT_...,
+            .sample_count = ...,
+            .color_write_mask = SG_COLORMASK_...,
+        });
+
+    The color_format, depth_format and sample_count items must be compatible
+    with the sokol-gfx render pass you're going to render into.
+
+    If you omit the color_format, depth_format and sample_count designators,
+    the new context will be compatible with the sokol-gfx default pass
+    (which is most likely not what you want, unless your offscreen render passes
+    exactly match the default pass attributes).
+
+    Once a context has been created, it can be made active with:
+
+        sspine_set_context(ctx);
+
+    To set the default context again:
+
+        sspine_set_contxt(sspine_default_context());
+
+    ...and to get the currently active context:
+
+        sspine_context cur_ctx = sspine_get_context();
+
+    The currently active context only matter for two functions:
+
+        - sspine_draw_instance_in_layer()
+        - sspine_draw_layer()
+
+    Alternatively you can bypass the currently set context with these
+    alternative functions:
+
+        - sspine_context_draw_layer_in_instance(ctx, ...)
+        - sspine_context_draw_layer(ctx, ...)
+
+    These explicitely take a context argument, completely ignore
+    and don't change the active context.
+
+    You can query some information about the a context with the function:
+
+        sspine_context_info info = ssgpine_get_context_info(ctx);
+
+    This returns the current number of recorded vertices, indices
+    and draw commands.
+
+    RESOURCE STATES:
+    ================
+    Similar to sokol-gfx, you can query the current 'resource state' of Spine
+    objects:
+
+        sspine_resource_state sspine_get_atlas_resource_state(sspine_atlas atlas);
+        sspine_resource_state sspine_get_skeleton_resource_state(sspine_atlas atlas);
+        sspine_resource_state sspine_get_instance_resource_state(sspine_atlas atlas);
+        sspine_resource_state sspine_get_skinset_resource_state(sspine_atlas atlas);
+        sspine_resource_state sspine_get_context_resource_state(sspine_atlas atlas);
+
+    This returns one of
+
+        - SSPINE_RESOURCE_VALID: the object is valid and ready to use
+        - SSPINE_RESOURCE_FAILED: the object creation has failed
+        - SSPINE_RESOURCE_INVALID: the object or one of its dependencies is
+          invalid, it either no longer exists, or the the handle hasn't been
+          initialized with a call to one of the object creation functions
+
+    MISC HELPER FUNCTIONS:
+    ======================
+    There's a couple of helper functions which don't fit into a big enough category
+    of their own:
+
+    You can ask a skeleton for the atlas it has been created from:
+
+        sspine_atlas atlas = sspine_get_skeleton_atlas(skeleton);
+
+    ...and likewise, ask an instance for the skeleton it has been created from:
+
+        sspine_skeleton skeleton = sspine_get_instance_skeleton(instance);
+
+    ...and finally you can convert a layer transform struct into a 4x4 projection
+    matrix that's memory-layout compatible with sokol-gl:
+
+        const sspine_layer_transform tform = { ... };
+        const sspine_mat4 proj = sspine_layer_transform_to_mat4(&tform);
+        sgl_matrix_mode_projection();
+        sgl_load_matrix(proj.m);
+
+    ANIMATIONS
+    ==========
+    Animations have their own handle type sspine_anim. A valid sspine_anim
+    handle is either obtained by looking up an animation by name from a skeleton:
+
+        sspine_anim anim = sspine_anim_by_name(skeleton, "walk");
+
+    ...or by index:
+
+        sspine_anim anim = sspine_anim_by_index(skeleton, 0);
+
+    The returned anim handle will be invalid if an animation of that name doesn't
+    exist, or the provided index is out-of-range:
+
+        if (!sspine_anim_is_valid(anim)) {
+            // animation handle is not valid
+         }
+
+    An animation handle will also become invalid when the skeleton object it was
+    created is destroyed, or otherwise becomes invalid.
+
+    You can iterate over all animations in a skeleton:
+
+        const int num_anims = sspine_num_anims(skeleton);
+        for (int anim_index = 0; anim_index < num_anims; anim_index++) {
+            sspine_anim anim = sspine_anim_by_index(skeleton, anim_index);
+            ...
+        }
+
+    Since sspine_anim is a 'fat handle' (it houses a skeleton handle and an index),
+    there's a helper function which checks if two anim handles are equal:
+
+        if (sspine_anim_equal(anim0, anim1)) {
+            ...
+        }
+
+    To query information about an animation:
+
+        const sspine_anim_info info = sspine_get_anim_info(anim);
+        if (info.valid) {
+            printf("index: %d, duration: %f, name: %s", info.index, info.duration, info.name.cstr);
+        }
+
+    Scheduling and mixing animations is controlled through the following functions:
+
+        void sspine_clear_animation_tracks(sspine_instance instance);
+        void sspine_clear_animation_track(sspine_instance instance, int track_index);
+        void sspine_set_animation(sspine_instance instance, sspine_anim anim, int track_index, bool loop);
+        void sspine_add_animation(sspine_instance instance, sspine_anim anim, int track_index, bool loop, float delay);
+        void sspine_set_empty_animation(sspine_instance instance, int track_index, float mix_duration);
+        void sspine_add_empty_animation(sspine_instance instance, int track_index, float mix_duration, float delay);
+
+    Please refer to the spine-c documentation to get an idea what these functions do:
+
+        http://en.esotericsoftware.com/spine-c#Applying-animations
+
+    EVENTS
+    ======
+    For a general idea of Spine events, see here: http://esotericsoftware.com/spine-events
+
+    After calling sspine_update_instance() to advance the currently configured animations,
+    you can poll for triggered events like this:
+
+        const int num_triggered_events = sspine_num_triggered_events(instance);
+        for (int i = 0; i < num_triggered_events; i++) {
+            const sspine_triggered_event_info info = sspine_get_triggered_event_info(instance, i);
+            if (info.valid) {
+                ...
+            }
+        }
+
+    The returned sspine_triggered_event_info struct gives you the current runtime properties
+    of the event (in case the event has keyed properties). For the actual list of event
+    properties please see the actual sspine_triggered_event_info struct declaration.
+
+    It's also possible to inspect the static event definition on a skeleton, this works
+    the same as iterating through animations. You can lookup an event by name,
+    get the number of events, lookup an event by its index, and get detailed
+    information about an event:
+
+        int sspine_num_events(sspine_skeleton skeleton);
+        sspine_event sspine_event_by_name(sspine_skeleton skeleton, const char* name);
+        sspine_event sspine_event_by_index(sspine_skeleton skeleton, int index);
+        bool sspine_event_valid(sspine_event event);
+        bool sspine_event_equal(sspine_event first, sspine_event second);
+        sspine_event_info sspine_get_event_info(sspine_event event);
+
+    (FIXME: shouldn't the event info struct contains an sspine_anim handle?)
+
+    IK TARGETS
+    ==========
+    The IK target function group allows to iterate over the IK targets that have been
+    defined on a skeleton, find an IK target by name, get detailed information about
+    an IK target, and most importantly, set the world space position of an IK target
+    which updates the position of all bones influenced by the IK target:
+
+        int sspine_num_iktargets(sspine_skeleton skeleton);
+        sspine_iktarget sspine_iktarget_by_name(sspine_skeleton skeleton, const char* name);
+        sspine_iktarget sspine_iktarget_by_index(sspine_skeleton skeleton, int index);
+        bool sspine_iktarget_valid(sspine_iktarget iktarget);
+        bool sspine_iktarget_equal(sspine_iktarget first, sspine_iktarget second);
+        sspine_iktarget_info sspine_get_iktarget_info(sspine_iktarget iktarget);
+        void sspine_set_iktarget_world_pos(sspine_instance instance, sspine_iktarget iktarget, sspine_vec2 world_pos);
+
+    BONES
+    =====
+    Skeleton bones are wrapped with an sspine_bone handle which can be created from
+    a skeleton handle, and either a bone name:
+
+        sspine_bone bone = sspine_bone_by_name(skeleton, "root");
+        assert(sspine_bone_valid(bone));
+
+    ...or a bone index:
+
+        sspine_bone bone = sspine_bone_by_index(skeleton, 0);
+        assert(sspine_bone_valid(bone));
+
+    ...to iterate over all bones of a skeleton and query information about each
+    bone:
+
+        const int num_bones = sspine_num_bones(skeleton);
+        for (int bone_index = 0; bone_index < num_bones; bone_index++) {
+            sspine_bone bone = sspine_bone_by_index(skeleton, bone_index);
+            const sspine_bone_info info = sspine_get_bone_info(skeleton, bone);
+            if (info.valid) {
+                ...
+            }
+        }
+
+    The sspine_bone_info struct provides the shared, static bone state in the skeleton (like
+    the name, a parent bone handle, bone length, pose transform and a color attribute),
+    but doesn't contain any dynamic information of per-instance bones.
+
+    To manipulate the per-instance bone attributes use the following setter functions:
+
+        void sspine_set_bone_transform(sspine_instance instance, sspine_bone bone, const sspine_bone_transform* transform);
+        void sspine_set_bone_position(sspine_instance instance, sspine_bone bone, sspine_vec2 position);
+        void sspine_set_bone_rotation(sspine_instance instance, sspine_bone bone, float rotation);
+        void sspine_set_bone_scale(sspine_instance instance, sspine_bone bone, sspine_vec2 scale);
+        void sspine_set_bone_shear(sspine_instance instance, sspine_bone bone, sspine_vec2 shear);
+
+    ...and to query the per-instance bone attributes, the following getters:
+
+        sspine_bone_transform sspine_get_bone_transform(sspine_instance instance, sspine_bone bone);
+        sspine_vec2 sspine_get_bone_position(sspine_instance instance, sspine_bone bone);
+        float sspine_get_bone_rotation(sspine_instance instance, sspine_bone bone);
+        sspine_vec2 sspine_get_bone_scale(sspine_instance instance, sspine_bone bone);
+        sspine_vec2 sspine_get_bone_shear(sspine_instance instance, sspine_bone bone);
+
+    These functions all work in the local bone coordinate system (relative to a bone's parent bone).
+
+    To transform positions between bone-local and global space use the following helper functions:
+
+        sspine_vec2 sspine_bone_local_to_world(sspine_instance instance, sspine_bone bone, sspine_vec2 local_pos);
+        sspine_vec2 sspine_bone_world_to_local(sspine_instance instance, sspine_bone bone, sspine_vec2 world_pos);
+
+    ...and as a convenience, there's a helper function which obtains the bone position in global space
+    directly:
+
+        sspine_vec2 sspine_get_bone_world_position(sspine_instance instance, sspine_bone bone);
+
+    SKINS AND SKINSETS
+    ==================
+    Skins are named pieces of geometry which can be turned on and off, what makes Spine skins a bit
+    confusing is that they are hierarchical. A skin can itself be a collection of other skins. Setting
+    the 'root skin' will also make all 'child skins' visible. In sokol-spine collections of skins are
+    managed through dedicated 'skin set' objects. Under the hood they create a 'root skin' where the
+    skins of the skin set are attached to, but from the outside it just looks like a 'flat' collection
+    of skins without the tricky hierarchical management.
+
+    Like other 'subobjects', skin handles can be obtained by the skin name from a skeleton handle:
+
+        sspine_skin skin = sspine_skin_by_name(skeleton, "jacket");
+        assert(sspine_skin_valid(skin));
+
+    ...or by a skin index:
+
+        sspine_skin skin = sspine_skin_by_index(skeleton, 0);
+        assert(sspine_skin_valid(skin));
+
+    ...you can iterate over all skins of a skeleton and query some information about the skin:
+
+        const int num_skins = sspine_num_skins(skeleton);
+        for (int skin_index = 0; skin_index < num_skins; skin_index++) {
+            sspine_skin skin = sspine_skin_by_index(skin_index);
+            sspine_skin_info info = sspine_get_skin_info(skin);
+            if (info.valid) {
+                ...
+            }
+        }
+
+    Currently, the only useful query item is the skin name though.
+
+    To make a skin visible on an instance, just call:
+
+        sspine_set_skin(instance, skin);
+
+    ...this will first deactivate the previous skin before setting a new skin.
+
+    A more powerful way to configure the skin visibility is through 'skin sets'. Skin
+    sets are simply flat collections of skins which should be made visible at once.
+    A new skin set is created like this:
+
+        sspine_skinset skinset = sspine_make_skinset(&(sspine_skinset_desc){
+            .skeleton = skeleton,
+            .skins = {
+                sspine_skin_by_name(skeleton, "blue-jacket"),
+                sspine_skin_by_name(skeleton, "green-pants"),
+                sspine_skin_by_name(skeleton, "blonde-hair"),
+                ...
+            }
+        });
+        assert(sspine_skinset_valid(skinset))
+
+    ...then simply set the skinset on an instance to reconfigure the appearance
+    of the instance:
+
+        sspine_set_skinset(instance, skinset);
+
+    The functions sspine_set_skinset() and sspine_set_skin() will cancel each other.
+    Calling sspine_set_skinset() deactivates the effect of sspine_set_skin() and
+    vice versa.
+
+    ERROR REPORTING AND LOGGING
+    ===========================
+    sokol_spine.h introduces a new combined logging- and error-reporting
+    mechanism which replaces the old SOKOL_LOG macro, and the more recent
+    logging callback.
+
+    The new reporting uses a more elaborate logger callback which provides:
+
+        - a short tag string identifying the header (for instance 'sspine')
+        - a numeric log level (panic, error, warning, info)
+        - a numeric error code (SSPINE_ERROR_*)
+        - in debug mode: the error code as human readable string
+        - a line number, where in the header the problem occured
+        - in debug mode: the filename of the header
+        - and a user data parameter
+
+    The logging callback will be standardized across all sokol headers,
+    so that it will be possible to use the same logging function with
+    all headers.
+
+    To override logging, first write a logging function like this:
+
+        void my_log(const char* tag,        // e.g. 'sspine'
+                    uint32_t log_level,     // 0=panic, 1=error, 2=warn, 3=info
+                    uint32_t error_code,    // SSPINE_ERROR_*
+                    const char* error_id,   // error as string, only in debug mode, otherwise empty string
+                    int line_nr,            // line number in sokol_spine.h
+                    const char* filename,   // debug mode only, otherwise empty string
+                    void* user_data)
+        {
+            ...
+        }
+
+    ...and then setup sokol-spine like this:
+
+        sspine_setup(&(sspine_desc){
+            .logger = {
+                .func = my_log,
+                .user_data = ...,
+            }
+        });
+
+    If no custom logger is provided, verbose default logging goes to stderr
+    (this means you won't see any logging messages on Android, or on Windows
+    unless the problem is attached to a terminal!).
+
+    Eventually there will be a more luxurious sokol_log.h header, which will
+    provide more control over logging, also on Windows or Android.
+
+    MEMORY ALLOCATION OVERRIDE
+    ==========================
+    You can override the memory allocation functions at initialization time
+    like this:
+
+        void* my_alloc(size_t size, void* user_data) {
+            return malloc(size);
+        }
+
+        void my_free(void* ptr, void* user_data) {
+            free(ptr);
+        }
+
+        ...
+            sspine_setup(&(sspine_desc){
+                // ...
+                .allocator = {
+                    .alloc = my_alloc,
+                    .free = my_free,
+                    .user_data = ...;
+                }
+            });
+        ...
+
+    If no overrides are provided, malloc and free will be used.
+
+    This only affects memory allocation calls done by sokol_gfx.h
+    itself though, not any allocations in OS libraries.
+
+    LICENSE
+    =======
+    zlib/libpng license
+
+    Copyright (c) 2022 Andre Weissflog
+
+    This software is provided 'as-is', without any express or implied warranty.
+    In no event will the authors be held liable for any damages arising from the
+    use of this software.
+
+    Permission is granted to anyone to use this software for any purpose,
+    including commercial applications, and to alter it and redistribute it
+    freely, subject to the following restrictions:
+
+        1. The origin of this software must not be misrepresented; you must not
+        claim that you wrote the original software. If you use this software in a
+        product, an acknowledgment in the product documentation would be
+        appreciated but is not required.
+
+        2. Altered source versions must be plainly marked as such, and must not
+        be misrepresented as being the original software.
+
+        3. This notice may not be removed or altered from any source
+        distribution.
+*/
+#define SOKOL_SPINE_INCLUDED (1)
+#include <stdint.h>
+#include <stdbool.h>
+#include <stddef.h> // size_t
+
+#if !defined(SOKOL_GFX_INCLUDED)
+#error "Please include sokol_gfx.h before sokol_spine.h"
+#endif
+
+#if defined(SOKOL_API_DECL) && !defined(SOKOL_SPINE_API_DECL)
+#define SOKOL_SPINE_API_DECL SOKOL_API_DECL
+#endif
+#ifndef SOKOL_SPINE_API_DECL
+#if defined(_WIN32) && defined(SOKOL_DLL) && defined(SOKOL_SPINE_IMPL)
+#define SOKOL_SPINE_API_DECL __declspec(dllexport)
+#elif defined(_WIN32) && defined(SOKOL_DLL)
+#define SOKOL_SPINE_API_DECL __declspec(dllimport)
+#else
+#define SOKOL_SPINE_API_DECL extern
+#endif
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum {
+    SSPINE_INVALID_ID = 0,
+    SSPINE_MAX_SKINSET_SKINS = 32,
+    SSPINE_MAX_STRING_SIZE = 61,    // see sspine_string struct
+};
+
+typedef struct sspine_context { uint32_t id; } sspine_context;
+typedef struct sspine_atlas { uint32_t id; } sspine_atlas;
+typedef struct sspine_skeleton { uint32_t id; } sspine_skeleton;
+typedef struct sspine_instance { uint32_t id; } sspine_instance;
+typedef struct sspine_skinset { uint32_t id; } sspine_skinset;
+
+typedef struct sspine_image { uint32_t atlas_id; int index; } sspine_image;
+typedef struct sspine_atlas_page { uint32_t atlas_id; int index; } sspine_atlas_page;
+typedef struct sspine_anim { uint32_t skeleton_id; int index; } sspine_anim;
+typedef struct sspine_bone { uint32_t skeleton_id; int index; } sspine_bone;
+typedef struct sspine_slot { uint32_t skeleton_id; int index; } sspine_slot;
+typedef struct sspine_event { uint32_t skeleton_id; int index; } sspine_event;
+typedef struct sspine_iktarget { uint32_t skeleton_id; int index; } sspine_iktarget;
+typedef struct sspine_skin { uint32_t skeleton_id; int index; } sspine_skin;
+
+typedef struct sspine_range { const void* ptr; size_t size; } sspine_range;
+typedef struct sspine_vec2 { float x, y; } sspine_vec2;
+typedef struct sspine_mat4 { float m[16]; } sspine_mat4;
+typedef sg_color sspine_color;
+
+typedef struct sspine_string {
+    bool valid;
+    bool truncated;
+    uint8_t len;
+    char cstr[SSPINE_MAX_STRING_SIZE];
+} sspine_string;
+
+typedef enum sspine_resource_state {
+    SSPINE_RESOURCESTATE_INITIAL,
+    SSPINE_RESOURCESTATE_ALLOC,
+    SSPINE_RESOURCESTATE_VALID,
+    SSPINE_RESOURCESTATE_FAILED,
+    SSPINE_RESOURCESTATE_INVALID,
+    _SSPINE_RESOURCESTATE_FORCE_U32 = 0x7FFFFFFF
+} sspine_resource_state;
+
+// error codes via x-macro magic
+#define _SSPINE_ERRORS \
+    _SSPINE_XMACRO(OK)\
+    _SSPINE_XMACRO(CONTEXT_POOL_EXHAUSTED)\
+    _SSPINE_XMACRO(ATLAS_POOL_EXHAUSTED)\
+    _SSPINE_XMACRO(SKELETON_POOL_EXHAUSTED)\
+    _SSPINE_XMACRO(SKINSET_POOL_EXHAUSTED)\
+    _SSPINE_XMACRO(INSTANCE_POOL_EXHAUSTED)\
+    _SSPINE_XMACRO(CANNOT_DESTROY_DEFAULT_CONTEXT)\
+    _SSPINE_XMACRO(ATLAS_DESC_NO_DATA)\
+    _SSPINE_XMACRO(SPINE_ATLAS_CREATION_FAILED)\
+    _SSPINE_XMACRO(SG_ALLOC_IMAGE_FAILED)\
+    _SSPINE_XMACRO(SKELETON_DESC_NO_DATA)\
+    _SSPINE_XMACRO(SKELETON_DESC_NO_ATLAS)\
+    _SSPINE_XMACRO(SKELETON_ATLAS_NOT_VALID)\
+    _SSPINE_XMACRO(SPINE_SKELETON_DATA_CREATION_FAILED)\
+    _SSPINE_XMACRO(SKINSET_DESC_NO_SKELETON)\
+    _SSPINE_XMACRO(SKINSET_SKELETON_NOT_VALID)\
+    _SSPINE_XMACRO(SKINSET_INVALID_SKIN_HANDLE)\
+    _SSPINE_XMACRO(INSTANCE_DESC_NO_SKELETON)\
+    _SSPINE_XMACRO(INSTANCE_SKELETON_NOT_VALID)\
+    _SSPINE_XMACRO(INSTANCE_ATLAS_NOT_VALID)\
+    _SSPINE_XMACRO(SPINE_SKELETON_CREATION_FAILED)\
+    _SSPINE_XMACRO(SPINE_ANIMATIONSTATE_CREATION_FAILED)\
+    _SSPINE_XMACRO(SPINE_SKELETONCLIPPING_CREATION_FAILED)\
+    _SSPINE_XMACRO(COMMAND_BUFFER_OVERFLOW)\
+    _SSPINE_XMACRO(VERTEX_BUFFER_OVERFLOW)\
+    _SSPINE_XMACRO(INDEX_BUFFER_OVERFLOW)\
+    _SSPINE_XMACRO(STRING_TRUNCATED)\
+
+#define _SSPINE_XMACRO(code) SSPINE_ERROR_##code,
+typedef enum sspine_error {
+    _SSPINE_ERRORS
+} sspine_error;
+#undef _SSPINE_XMACRO
+
+typedef enum sspine_loglevel {
+    SSPINE_LOGLEVEL_PANIC = 0,
+    SSPINE_LOGLEVEL_ERROR = 1,
+    SSPINE_LOGLEVEL_WARN = 2,
+    SSPINE_LOGLEVEL_INFO = 3,
+} sspine_loglevel;
+
+typedef struct sspine_layer_transform {
+    sspine_vec2 size;
+    sspine_vec2 origin;
+} sspine_layer_transform;
+
+typedef struct sspine_bone_transform {
+    sspine_vec2 position;
+    float rotation;         // in degrees
+    sspine_vec2 scale;
+    sspine_vec2 shear;      // in degrees
+} sspine_bone_transform;
+
+typedef struct sspine_context_desc {
+    int max_vertices;
+    int max_commands;
+    sg_pixel_format color_format;
+    sg_pixel_format depth_format;
+    int sample_count;
+    sg_color_mask color_write_mask;
+} sspine_context_desc;
+
+typedef struct sspine_context_info {
+    int num_vertices;   // current number of vertices
+    int num_indices;    // current number of indices
+    int num_commands;   // current number of commands
+} sspine_context_info;
+
+typedef struct sspine_image_info {
+    bool valid;
+    sg_image sgimage;
+    sg_filter min_filter;
+    sg_filter mag_filter;
+    sg_wrap wrap_u;
+    sg_wrap wrap_v;
+    int width;
+    int height;
+    bool premul_alpha;
+    sspine_string filename;
+} sspine_image_info;
+
+typedef struct sspine_atlas_overrides {
+    sg_filter min_filter;
+    sg_filter mag_filter;
+    sg_wrap wrap_u;
+    sg_wrap wrap_v;
+    bool premul_alpha_enabled;
+    bool premul_alpha_disabled;
+} sspine_atlas_overrides;
+
+typedef struct sspine_atlas_desc {
+    sspine_range data;
+    sspine_atlas_overrides override;
+} sspine_atlas_desc;
+
+typedef struct sspine_atlas_page_info {
+    bool valid;
+    sspine_atlas atlas;
+    sspine_image_info image;
+    sspine_atlas_overrides overrides;
+} sspine_atlas_page_info;
+
+typedef struct sspine_skeleton_desc {
+    sspine_atlas atlas;
+    float prescale;
+    float anim_default_mix;
+    const char* json_data;
+    sspine_range binary_data;
+} sspine_skeleton_desc;
+
+typedef struct sspine_skinset_desc {
+    sspine_skeleton skeleton;
+    sspine_skin skins[SSPINE_MAX_SKINSET_SKINS];
+} sspine_skinset_desc;
+
+typedef struct sspine_anim_info {
+    bool valid;
+    int index;
+    float duration;
+    sspine_string name;
+} sspine_anim_info;
+
+typedef struct sspine_bone_info {
+    bool valid;
+    int index;
+    sspine_bone parent_bone;
+    float length;
+    sspine_bone_transform pose;
+    sspine_color color;
+    sspine_string name;
+} sspine_bone_info;
+
+typedef struct sspine_slot_info {
+    bool valid;
+    int index;
+    sspine_bone bone;
+    sspine_color color;
+    sspine_string attachment_name;
+    sspine_string name;
+} sspine_slot_info;
+
+typedef struct sspine_iktarget_info {
+    bool valid;
+    int index;
+    sspine_bone target_bone;
+    sspine_string name;
+} sspine_iktarget_info;
+
+typedef struct sspine_skin_info {
+    bool valid;
+    int index;
+    sspine_string name;
+} sspine_skin_info;
+
+typedef struct sspine_event_info {
+    bool valid;
+    int index;
+    int int_value;
+    float float_value;
+    float volume;
+    float balance;
+    sspine_string name;
+    sspine_string string_value;
+    sspine_string audio_path;
+} sspine_event_info;
+
+typedef struct sspine_triggered_event_info {
+    bool valid;
+    sspine_event event;
+    float time;
+    int int_value;
+    float float_value;
+    float volume;
+    float balance;
+    sspine_string string_value;
+} sspine_triggered_event_info;
+
+typedef struct sspine_instance_desc {
+    sspine_skeleton skeleton;
+} sspine_instance_desc;
+
+typedef struct sspine_allocator {
+    void* (*alloc)(size_t size, void* user_data);
+    void (*free)(void* ptr, void* user_data);
+    void* user_data;
+} sspine_allocator;
+
+typedef struct sspine_logger {
+    void (*func)(
+        const char* tag,      // always "sspine"
+        uint32_t log_level,   // 0=panic, 1=error, 2=warning, 3=info
+        uint32_t error_code,  // SSPINE_ERROR_*
+        const char* error_id, // error as string, debug only, otherwise empty string
+        int line_nr,          // line number in sokol_spine.h
+        const char* filename, // debug mode only, otherwise empty string
+        void* user_data);
+    void* user_data;
+} sspine_logger;
+
+typedef struct sspine_desc {
+    int max_vertices;
+    int max_commands;
+    int context_pool_size;
+    int atlas_pool_size;
+    int skeleton_pool_size;
+    int skinset_pool_size;
+    int instance_pool_size;
+    sg_pixel_format color_format;
+    sg_pixel_format depth_format;
+    int sample_count;
+    sg_color_mask color_write_mask;
+    sspine_allocator allocator;
+    sspine_logger logger;
+} sspine_desc;
+
+// setup/shutdown
+SOKOL_SPINE_API_DECL void sspine_setup(const sspine_desc* desc);
+SOKOL_SPINE_API_DECL void sspine_shutdown(void);
+
+// context functions
+SOKOL_SPINE_API_DECL sspine_context sspine_make_context(const sspine_context_desc* desc);
+SOKOL_SPINE_API_DECL void sspine_destroy_context(sspine_context ctx);
+SOKOL_SPINE_API_DECL void sspine_set_context(sspine_context ctx);
+SOKOL_SPINE_API_DECL sspine_context sspine_get_context(void);
+SOKOL_SPINE_API_DECL sspine_context sspine_default_context(void);
+SOKOL_SPINE_API_DECL sspine_context_info sspine_get_context_info(sspine_context ctx);
+
+// create and destroy spine objects
+SOKOL_SPINE_API_DECL sspine_atlas sspine_make_atlas(const sspine_atlas_desc* desc);
+SOKOL_SPINE_API_DECL sspine_skeleton sspine_make_skeleton(const sspine_skeleton_desc* desc);
+SOKOL_SPINE_API_DECL sspine_skinset sspine_make_skinset(const sspine_skinset_desc* desc);
+SOKOL_SPINE_API_DECL sspine_instance sspine_make_instance(const sspine_instance_desc* desc);
+SOKOL_SPINE_API_DECL void sspine_destroy_atlas(sspine_atlas atlas);
+SOKOL_SPINE_API_DECL void sspine_destroy_skeleton(sspine_skeleton skeleton);
+SOKOL_SPINE_API_DECL void sspine_destroy_skinset(sspine_skinset skinset);
+SOKOL_SPINE_API_DECL void sspine_destroy_instance(sspine_instance instance);
+
+// mark a new frame (call at start of a frame before any sspine_draw_instance())
+SOKOL_SPINE_API_DECL void sspine_new_frame(void);
+
+// configure instance appearance via skinsets
+SOKOL_SPINE_API_DECL void sspine_set_skinset(sspine_instance instance, sspine_skinset skinset);
+
+// update instance animations before drawing
+SOKOL_SPINE_API_DECL void sspine_update_instance(sspine_instance instance, float delta_time);
+
+// iterate over triggered events after updating an instance
+SOKOL_SPINE_API_DECL int sspine_num_triggered_events(sspine_instance instance);
+SOKOL_SPINE_API_DECL sspine_triggered_event_info sspine_get_triggered_event_info(sspine_instance instance, int triggered_event_index);
+
+// draw instance into current or explicit context
+SOKOL_SPINE_API_DECL void sspine_draw_instance_in_layer(sspine_instance instance, int layer);
+SOKOL_SPINE_API_DECL void sspine_context_draw_instance_in_layer(sspine_context ctx, sspine_instance instance, int layer);
+
+// helper function to convert sspine_layer_transform into projection matrix
+SOKOL_SPINE_API_DECL sspine_mat4 sspine_layer_transform_to_mat4(const sspine_layer_transform* tform);
+
+// draw a layer in current context or explicit context (call once per context and frame in sokol-gfx pass)
+SOKOL_SPINE_API_DECL void sspine_draw_layer(int layer, const sspine_layer_transform* tform);
+SOKOL_SPINE_API_DECL void sspine_context_draw_layer(sspine_context ctx, int layer, const sspine_layer_transform* tform);
+
+// get current resource state (INITIAL, ALLOC, VALID, FAILED, INVALID)
+SOKOL_SPINE_API_DECL sspine_resource_state sspine_get_context_resource_state(sspine_context context);
+SOKOL_SPINE_API_DECL sspine_resource_state sspine_get_atlas_resource_state(sspine_atlas atlas);
+SOKOL_SPINE_API_DECL sspine_resource_state sspine_get_skeleton_resource_state(sspine_skeleton skeleton);
+SOKOL_SPINE_API_DECL sspine_resource_state sspine_get_skinset_resource_state(sspine_skinset skinset);
+SOKOL_SPINE_API_DECL sspine_resource_state sspine_get_instance_resource_state(sspine_instance instance);
+
+// shortcut for sspine_get_*_state() == SSPINE_RESOURCESTATE_VALID
+SOKOL_SPINE_API_DECL bool sspine_context_valid(sspine_context context);
+SOKOL_SPINE_API_DECL bool sspine_atlas_valid(sspine_atlas atlas);
+SOKOL_SPINE_API_DECL bool sspine_skeleton_valid(sspine_skeleton skeleton);
+SOKOL_SPINE_API_DECL bool sspine_instance_valid(sspine_instance instance);
+SOKOL_SPINE_API_DECL bool sspine_skinset_valid(sspine_skinset skinset);
+
+// get dependency objects
+SOKOL_SPINE_API_DECL sspine_atlas sspine_get_skeleton_atlas(sspine_skeleton skeleton);
+SOKOL_SPINE_API_DECL sspine_skeleton sspine_get_instance_skeleton(sspine_instance instance);
+
+// atlas images
+SOKOL_SPINE_API_DECL int sspine_num_images(sspine_atlas atlas);
+SOKOL_SPINE_API_DECL sspine_image sspine_image_by_index(sspine_atlas atlas, int index);
+SOKOL_SPINE_API_DECL bool sspine_image_valid(sspine_image image);
+SOKOL_SPINE_API_DECL bool sspine_image_equal(sspine_image first, sspine_image second);
+SOKOL_SPINE_API_DECL sspine_image_info sspine_get_image_info(sspine_image image);
+
+// atlas page functions
+SOKOL_SPINE_API_DECL int sspine_num_atlas_pages(sspine_atlas atlas);
+SOKOL_SPINE_API_DECL sspine_atlas_page sspine_atlas_page_by_index(sspine_atlas atlas, int index);
+SOKOL_SPINE_API_DECL bool sspine_atlas_page_valid(sspine_atlas_page page);
+SOKOL_SPINE_API_DECL bool sspine_atlas_page_equal(sspine_atlas_page first, sspine_atlas_page second);
+SOKOL_SPINE_API_DECL sspine_atlas_page_info sspine_get_atlas_page_info(sspine_atlas_page page);
+
+// instance transform functions
+SOKOL_SPINE_API_DECL void sspine_set_position(sspine_instance instance, sspine_vec2 position);
+SOKOL_SPINE_API_DECL void sspine_set_scale(sspine_instance instance, sspine_vec2 scale);
+SOKOL_SPINE_API_DECL void sspine_set_color(sspine_instance instance, sspine_color color);
+SOKOL_SPINE_API_DECL sspine_vec2 sspine_get_position(sspine_instance instance);
+SOKOL_SPINE_API_DECL sspine_vec2 sspine_get_scale(sspine_instance instance);
+SOKOL_SPINE_API_DECL sspine_color sspine_get_color(sspine_instance instance);
+
+// instance animation functions
+SOKOL_SPINE_API_DECL int sspine_num_anims(sspine_skeleton skeleton);
+SOKOL_SPINE_API_DECL sspine_anim sspine_anim_by_name(sspine_skeleton skeleton, const char* name);
+SOKOL_SPINE_API_DECL sspine_anim sspine_anim_by_index(sspine_skeleton skeleton, int index);
+SOKOL_SPINE_API_DECL bool sspine_anim_valid(sspine_anim anim);
+SOKOL_SPINE_API_DECL bool sspine_anim_equal(sspine_anim first, sspine_anim second);
+SOKOL_SPINE_API_DECL sspine_anim_info sspine_get_anim_info(sspine_anim anim);
+SOKOL_SPINE_API_DECL void sspine_clear_animation_tracks(sspine_instance instance);
+SOKOL_SPINE_API_DECL void sspine_clear_animation_track(sspine_instance instance, int track_index);
+SOKOL_SPINE_API_DECL void sspine_set_animation(sspine_instance instance, sspine_anim anim, int track_index, bool loop);
+SOKOL_SPINE_API_DECL void sspine_add_animation(sspine_instance instance, sspine_anim anim, int track_index, bool loop, float delay);
+SOKOL_SPINE_API_DECL void sspine_set_empty_animation(sspine_instance instance, int track_index, float mix_duration);
+SOKOL_SPINE_API_DECL void sspine_add_empty_animation(sspine_instance instance, int track_index, float mix_duration, float delay);
+
+// bone functions
+SOKOL_SPINE_API_DECL int sspine_num_bones(sspine_skeleton skeleton);
+SOKOL_SPINE_API_DECL sspine_bone sspine_bone_by_name(sspine_skeleton skeleton, const char* name);
+SOKOL_SPINE_API_DECL sspine_bone sspine_bone_by_index(sspine_skeleton skeleton, int index);
+SOKOL_SPINE_API_DECL bool sspine_bone_valid(sspine_bone bone);
+SOKOL_SPINE_API_DECL bool sspine_bone_equal(sspine_bone first, sspine_bone second);
+SOKOL_SPINE_API_DECL sspine_bone_info sspine_get_bone_info(sspine_bone bone);
+SOKOL_SPINE_API_DECL void sspine_set_bone_transform(sspine_instance instance, sspine_bone bone, const sspine_bone_transform* transform);
+SOKOL_SPINE_API_DECL void sspine_set_bone_position(sspine_instance instance, sspine_bone bone, sspine_vec2 position);
+SOKOL_SPINE_API_DECL void sspine_set_bone_rotation(sspine_instance instance, sspine_bone bone, float rotation);
+SOKOL_SPINE_API_DECL void sspine_set_bone_scale(sspine_instance instance, sspine_bone bone, sspine_vec2 scale);
+SOKOL_SPINE_API_DECL void sspine_set_bone_shear(sspine_instance instance, sspine_bone bone, sspine_vec2 shear);
+SOKOL_SPINE_API_DECL sspine_bone_transform sspine_get_bone_transform(sspine_instance instance, sspine_bone bone);
+SOKOL_SPINE_API_DECL sspine_vec2 sspine_get_bone_position(sspine_instance instance, sspine_bone bone);
+SOKOL_SPINE_API_DECL float sspine_get_bone_rotation(sspine_instance instance, sspine_bone bone);
+SOKOL_SPINE_API_DECL sspine_vec2 sspine_get_bone_scale(sspine_instance instance, sspine_bone bone);
+SOKOL_SPINE_API_DECL sspine_vec2 sspine_get_bone_shear(sspine_instance instance, sspine_bone bone);
+SOKOL_SPINE_API_DECL sspine_vec2 sspine_get_bone_world_position(sspine_instance instance, sspine_bone bone);
+SOKOL_SPINE_API_DECL sspine_vec2 sspine_bone_local_to_world(sspine_instance instance, sspine_bone bone, sspine_vec2 local_pos);
+SOKOL_SPINE_API_DECL sspine_vec2 sspine_bone_world_to_local(sspine_instance instance, sspine_bone bone, sspine_vec2 world_pos);
+
+// slot functions
+SOKOL_SPINE_API_DECL int sspine_num_slots(sspine_skeleton skeleton);
+SOKOL_SPINE_API_DECL sspine_slot sspine_slot_by_name(sspine_skeleton skeleton, const char* name);
+SOKOL_SPINE_API_DECL sspine_slot sspine_slot_by_index(sspine_skeleton skeleton, int index);
+SOKOL_SPINE_API_DECL bool sspine_slot_valid(sspine_slot slot);
+SOKOL_SPINE_API_DECL bool sspine_slot_equal(sspine_slot first, sspine_slot second);
+SOKOL_SPINE_API_DECL sspine_slot_info sspine_get_slot_info(sspine_slot slot);
+SOKOL_SPINE_API_DECL void sspine_set_slot_color(sspine_instance instance, sspine_slot slot, sspine_color color);
+SOKOL_SPINE_API_DECL sspine_color sspine_get_slot_color(sspine_instance instance, sspine_slot slot);
+
+// event functions
+SOKOL_SPINE_API_DECL int sspine_num_events(sspine_skeleton skeleton);
+SOKOL_SPINE_API_DECL sspine_event sspine_event_by_name(sspine_skeleton skeleton, const char* name);
+SOKOL_SPINE_API_DECL sspine_event sspine_event_by_index(sspine_skeleton skeleton, int index);
+SOKOL_SPINE_API_DECL bool sspine_event_valid(sspine_event event);
+SOKOL_SPINE_API_DECL bool sspine_event_equal(sspine_event first, sspine_event second);
+SOKOL_SPINE_API_DECL sspine_event_info sspine_get_event_info(sspine_event event);
+
+// ik target functions
+SOKOL_SPINE_API_DECL int sspine_num_iktargets(sspine_skeleton skeleton);
+SOKOL_SPINE_API_DECL sspine_iktarget sspine_iktarget_by_name(sspine_skeleton skeleton, const char* name);
+SOKOL_SPINE_API_DECL sspine_iktarget sspine_iktarget_by_index(sspine_skeleton skeleton, int index);
+SOKOL_SPINE_API_DECL bool sspine_iktarget_valid(sspine_iktarget iktarget);
+SOKOL_SPINE_API_DECL bool sspine_iktarget_equal(sspine_iktarget first, sspine_iktarget second);
+SOKOL_SPINE_API_DECL sspine_iktarget_info sspine_get_iktarget_info(sspine_iktarget iktarget);
+SOKOL_SPINE_API_DECL void sspine_set_iktarget_world_pos(sspine_instance instance, sspine_iktarget iktarget, sspine_vec2 world_pos);
+
+// skin functions
+SOKOL_SPINE_API_DECL int sspine_num_skins(sspine_skeleton skeleton);
+SOKOL_SPINE_API_DECL sspine_skin sspine_skin_by_name(sspine_skeleton skeleton, const char* name);
+SOKOL_SPINE_API_DECL sspine_skin sspine_skin_by_index(sspine_skeleton skeleton, int index);
+SOKOL_SPINE_API_DECL bool sspine_skin_valid(sspine_skin skin);
+SOKOL_SPINE_API_DECL bool sspine_skin_equal(sspine_skin first, sspine_skin second);
+SOKOL_SPINE_API_DECL sspine_skin_info sspine_get_skin_info(sspine_skin skin);
+SOKOL_SPINE_API_DECL void sspine_set_skin(sspine_instance instance, sspine_skin skin);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+//-- IMPLEMENTATION ------------------------------------------------------------
+#ifdef SOKOL_SPINE_IMPL
+#define SOKOL_SPINE_IMPL_INCLUDED (1)
+
+#if !defined(SPINE_SPINE_H_)
+#error "Please include spine/spine.h before the sokol_spine.h implementation"
+#endif
+
+#ifndef SOKOL_API_IMPL
+    #define SOKOL_API_IMPL
+#endif
+#ifndef SOKOL_DEBUG
+    #ifndef NDEBUG
+        #define SOKOL_DEBUG (1)
+    #endif
+#endif
+#ifndef SOKOL_ASSERT
+    #include <assert.h>
+    #define SOKOL_ASSERT(c) assert(c)
+#endif
+#ifndef SOKOL_UNREACHABLE
+    #define SOKOL_UNREACHABLE SOKOL_ASSERT(false)
+#endif
+#ifndef SOKOL_UNUSED
+    #define SOKOL_UNUSED(x) (void)(x)
+#endif
+
+#include <stdlib.h> // malloc/free
+#include <string.h> // memset, strcmp
+#include <stdio.h>  // stderr, fprintf (debug mode), fputs (release mode)
+
+/*
+    Embedded source compiled with:
+
+    sokol-shdc -i sspine.glsl -o sspine.h -l glsl330:glsl100:hlsl4:metal_macos:metal_ios:metal_sim:wgpu -b
+
+    @vs vs
+    uniform vs_params {
+        mat4 mvp;
+    };
+    in vec2 position;
+    in vec2 texcoord0;
+    in vec4 color0;
+    out vec2 uv;
+    out vec4 color;
+    void main() {
+        gl_Position = mvp * vec4(position, 0.0, 1.0);
+        uv = texcoord0;
+        color = color0;
+    }
+    @end
+
+    @fs fs
+    uniform sampler2D tex;
+    uniform fs_params {
+        float pma;
+    };
+    in vec2 uv;
+    in vec4 color;
+    out vec4 frag_color;
+    void main() {
+        vec4 c0 = texture(tex, uv) * color;
+        vec4 c1 = vec4(c0.rgb * c0.a, c0.a) * color;
+        frag_color = mix(c0, c1, pma);
+    }
+    @end
+
+    @program sspine vs fs
+*/
+#if defined(SOKOL_GLCORE33)
+static const char _sspine_vs_source_glsl330[352] = {
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+};
+static const char _sspine_fs_source_glsl330[300] = {
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+    0x34,0x2c,0x20,0x5f,0x33,0x34,0x29,0x20,0x2a,0x20,0x63,0x6f,0x6c,0x6f,0x72,0x2c,
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+    0x30,0x5d,0x2e,0x78,0x29,0x29,0x3b,0x0a,0x7d,0x0a,0x0a,0x00,
+};
+#elif defined(SOKOL_GLES2) || defined(SOKOL_GLES3)
+static const char _sspine_vs_source_glsl100[318] = {
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+    0x69,0x6e,0x28,0x29,0x0a,0x7b,0x0a,0x20,0x20,0x20,0x20,0x67,0x6c,0x5f,0x50,0x6f,
+    0x73,0x69,0x74,0x69,0x6f,0x6e,0x20,0x3d,0x20,0x6d,0x61,0x74,0x34,0x28,0x76,0x73,
+    0x5f,0x70,0x61,0x72,0x61,0x6d,0x73,0x5b,0x30,0x5d,0x2c,0x20,0x76,0x73,0x5f,0x70,
+    0x61,0x72,0x61,0x6d,0x73,0x5b,0x31,0x5d,0x2c,0x20,0x76,0x73,0x5f,0x70,0x61,0x72,
+    0x61,0x6d,0x73,0x5b,0x32,0x5d,0x2c,0x20,0x76,0x73,0x5f,0x70,0x61,0x72,0x61,0x6d,
+    0x73,0x5b,0x33,0x5d,0x29,0x20,0x2a,0x20,0x76,0x65,0x63,0x34,0x28,0x70,0x6f,0x73,
+    0x69,0x74,0x69,0x6f,0x6e,0x2c,0x20,0x30,0x2e,0x30,0x2c,0x20,0x31,0x2e,0x30,0x29,
+    0x3b,0x0a,0x20,0x20,0x20,0x20,0x75,0x76,0x20,0x3d,0x20,0x74,0x65,0x78,0x63,0x6f,
+    0x6f,0x72,0x64,0x30,0x3b,0x0a,0x20,0x20,0x20,0x20,0x63,0x6f,0x6c,0x6f,0x72,0x20,
+    0x3d,0x20,0x63,0x6f,0x6c,0x6f,0x72,0x30,0x3b,0x0a,0x7d,0x0a,0x0a,0x00,
+};
+static const char _sspine_fs_source_glsl100[356] = {
+    0x23,0x76,0x65,0x72,0x73,0x69,0x6f,0x6e,0x20,0x31,0x30,0x30,0x0a,0x70,0x72,0x65,
+    0x63,0x69,0x73,0x69,0x6f,0x6e,0x20,0x6d,0x65,0x64,0x69,0x75,0x6d,0x70,0x20,0x66,
+    0x6c,0x6f,0x61,0x74,0x3b,0x0a,0x70,0x72,0x65,0x63,0x69,0x73,0x69,0x6f,0x6e,0x20,
+    0x68,0x69,0x67,0x68,0x70,0x20,0x69,0x6e,0x74,0x3b,0x0a,0x0a,0x75,0x6e,0x69,0x66,
+    0x6f,0x72,0x6d,0x20,0x68,0x69,0x67,0x68,0x70,0x20,0x76,0x65,0x63,0x34,0x20,0x66,
+    0x73,0x5f,0x70,0x61,0x72,0x61,0x6d,0x73,0x5b,0x31,0x5d,0x3b,0x0a,0x75,0x6e,0x69,
+    0x66,0x6f,0x72,0x6d,0x20,0x68,0x69,0x67,0x68,0x70,0x20,0x73,0x61,0x6d,0x70,0x6c,
+    0x65,0x72,0x32,0x44,0x20,0x74,0x65,0x78,0x3b,0x0a,0x0a,0x76,0x61,0x72,0x79,0x69,
+    0x6e,0x67,0x20,0x68,0x69,0x67,0x68,0x70,0x20,0x76,0x65,0x63,0x32,0x20,0x75,0x76,
+    0x3b,0x0a,0x76,0x61,0x72,0x79,0x69,0x6e,0x67,0x20,0x68,0x69,0x67,0x68,0x70,0x20,
+    0x76,0x65,0x63,0x34,0x20,0x63,0x6f,0x6c,0x6f,0x72,0x3b,0x0a,0x0a,0x76,0x6f,0x69,
+    0x64,0x20,0x6d,0x61,0x69,0x6e,0x28,0x29,0x0a,0x7b,0x0a,0x20,0x20,0x20,0x20,0x68,
+    0x69,0x67,0x68,0x70,0x20,0x76,0x65,0x63,0x34,0x20,0x5f,0x32,0x35,0x20,0x3d,0x20,
+    0x74,0x65,0x78,0x74,0x75,0x72,0x65,0x32,0x44,0x28,0x74,0x65,0x78,0x2c,0x20,0x75,
+    0x76,0x29,0x20,0x2a,0x20,0x63,0x6f,0x6c,0x6f,0x72,0x3b,0x0a,0x20,0x20,0x20,0x20,
+    0x68,0x69,0x67,0x68,0x70,0x20,0x66,0x6c,0x6f,0x61,0x74,0x20,0x5f,0x33,0x34,0x20,
+    0x3d,0x20,0x5f,0x32,0x35,0x2e,0x77,0x3b,0x0a,0x20,0x20,0x20,0x20,0x67,0x6c,0x5f,
+    0x46,0x72,0x61,0x67,0x44,0x61,0x74,0x61,0x5b,0x30,0x5d,0x20,0x3d,0x20,0x6d,0x69,
+    0x78,0x28,0x5f,0x32,0x35,0x2c,0x20,0x76,0x65,0x63,0x34,0x28,0x5f,0x32,0x35,0x2e,
+    0x78,0x79,0x7a,0x20,0x2a,0x20,0x5f,0x33,0x34,0x2c,0x20,0x5f,0x33,0x34,0x29,0x20,
+    0x2a,0x20,0x63,0x6f,0x6c,0x6f,0x72,0x2c,0x20,0x76,0x65,0x63,0x34,0x28,0x66,0x73,
+    0x5f,0x70,0x61,0x72,0x61,0x6d,0x73,0x5b,0x30,0x5d,0x2e,0x78,0x29,0x29,0x3b,0x0a,
+    0x7d,0x0a,0x0a,0x00,
+};
+#elif defined(SOKOL_D3D11)
+static const uint8_t _sspine_vs_bytecode_hlsl4[844] = {
+    0x44,0x58,0x42,0x43,0xb2,0xdb,0x57,0x6f,0x29,0xa5,0x26,0x49,0xa3,0x0e,0xb4,0x9e,
+    0x0f,0x0d,0x7f,0xcd,0x01,0x00,0x00,0x00,0x4c,0x03,0x00,0x00,0x05,0x00,0x00,0x00,
+    0x34,0x00,0x00,0x00,0xf4,0x00,0x00,0x00,0x58,0x01,0x00,0x00,0xc8,0x01,0x00,0x00,
+    0xd0,0x02,0x00,0x00,0x52,0x44,0x45,0x46,0xb8,0x00,0x00,0x00,0x01,0x00,0x00,0x00,
+    0x48,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x1c,0x00,0x00,0x00,0x00,0x04,0xfe,0xff,
+    0x10,0x81,0x00,0x00,0x90,0x00,0x00,0x00,0x3c,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x01,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x76,0x73,0x5f,0x70,0x61,0x72,0x61,0x6d,
+    0x73,0x00,0xab,0xab,0x3c,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x60,0x00,0x00,0x00,
+    0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x78,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x40,0x00,0x00,0x00,0x02,0x00,0x00,0x00,0x80,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x5f,0x32,0x31,0x5f,0x6d,0x76,0x70,0x00,0x02,0x00,0x03,0x00,
+    0x04,0x00,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x4d,0x69,0x63,0x72,
+    0x6f,0x73,0x6f,0x66,0x74,0x20,0x28,0x52,0x29,0x20,0x48,0x4c,0x53,0x4c,0x20,0x53,
+    0x68,0x61,0x64,0x65,0x72,0x20,0x43,0x6f,0x6d,0x70,0x69,0x6c,0x65,0x72,0x20,0x31,
+    0x30,0x2e,0x31,0x00,0x49,0x53,0x47,0x4e,0x5c,0x00,0x00,0x00,0x03,0x00,0x00,0x00,
+    0x08,0x00,0x00,0x00,0x50,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x03,0x00,0x00,0x50,0x00,0x00,0x00,
+    0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x00,0x00,0x00,0x01,0x00,0x00,0x00,
+    0x03,0x03,0x00,0x00,0x50,0x00,0x00,0x00,0x02,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x03,0x00,0x00,0x00,0x02,0x00,0x00,0x00,0x0f,0x0f,0x00,0x00,0x54,0x45,0x58,0x43,
+    0x4f,0x4f,0x52,0x44,0x00,0xab,0xab,0xab,0x4f,0x53,0x47,0x4e,0x68,0x00,0x00,0x00,
+    0x03,0x00,0x00,0x00,0x08,0x00,0x00,0x00,0x50,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x0c,0x00,0x00,
+    0x50,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x00,0x00,0x00,
+    0x01,0x00,0x00,0x00,0x0f,0x00,0x00,0x00,0x59,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x01,0x00,0x00,0x00,0x03,0x00,0x00,0x00,0x02,0x00,0x00,0x00,0x0f,0x00,0x00,0x00,
+    0x54,0x45,0x58,0x43,0x4f,0x4f,0x52,0x44,0x00,0x53,0x56,0x5f,0x50,0x6f,0x73,0x69,
+    0x74,0x69,0x6f,0x6e,0x00,0xab,0xab,0xab,0x53,0x48,0x44,0x52,0x00,0x01,0x00,0x00,
+    0x40,0x00,0x01,0x00,0x40,0x00,0x00,0x00,0x59,0x00,0x00,0x04,0x46,0x8e,0x20,0x00,
+    0x00,0x00,0x00,0x00,0x04,0x00,0x00,0x00,0x5f,0x00,0x00,0x03,0x32,0x10,0x10,0x00,
+    0x00,0x00,0x00,0x00,0x5f,0x00,0x00,0x03,0x32,0x10,0x10,0x00,0x01,0x00,0x00,0x00,
+    0x5f,0x00,0x00,0x03,0xf2,0x10,0x10,0x00,0x02,0x00,0x00,0x00,0x65,0x00,0x00,0x03,
+    0x32,0x20,0x10,0x00,0x00,0x00,0x00,0x00,0x65,0x00,0x00,0x03,0xf2,0x20,0x10,0x00,
+    0x01,0x00,0x00,0x00,0x67,0x00,0x00,0x04,0xf2,0x20,0x10,0x00,0x02,0x00,0x00,0x00,
+    0x01,0x00,0x00,0x00,0x68,0x00,0x00,0x02,0x01,0x00,0x00,0x00,0x36,0x00,0x00,0x05,
+    0x32,0x20,0x10,0x00,0x00,0x00,0x00,0x00,0x46,0x10,0x10,0x00,0x01,0x00,0x00,0x00,
+    0x36,0x00,0x00,0x05,0xf2,0x20,0x10,0x00,0x01,0x00,0x00,0x00,0x46,0x1e,0x10,0x00,
+    0x02,0x00,0x00,0x00,0x38,0x00,0x00,0x08,0xf2,0x00,0x10,0x00,0x00,0x00,0x00,0x00,
+    0x56,0x15,0x10,0x00,0x00,0x00,0x00,0x00,0x46,0x8e,0x20,0x00,0x00,0x00,0x00,0x00,
+    0x01,0x00,0x00,0x00,0x32,0x00,0x00,0x0a,0xf2,0x00,0x10,0x00,0x00,0x00,0x00,0x00,
+    0x06,0x10,0x10,0x00,0x00,0x00,0x00,0x00,0x46,0x8e,0x20,0x00,0x00,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x46,0x0e,0x10,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x08,
+    0xf2,0x20,0x10,0x00,0x02,0x00,0x00,0x00,0x46,0x0e,0x10,0x00,0x00,0x00,0x00,0x00,
+    0x46,0x8e,0x20,0x00,0x00,0x00,0x00,0x00,0x03,0x00,0x00,0x00,0x3e,0x00,0x00,0x01,
+    0x53,0x54,0x41,0x54,0x74,0x00,0x00,0x00,0x06,0x00,0x00,0x00,0x01,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x06,0x00,0x00,0x00,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x02,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+};
+static const uint8_t _sspine_fs_bytecode_hlsl4[876] = {
+    0x44,0x58,0x42,0x43,0xd8,0xf3,0x35,0x5e,0xf6,0xd6,0x61,0x80,0x71,0x85,0x56,0x46,
+    0x08,0x09,0x74,0xcd,0x01,0x00,0x00,0x00,0x6c,0x03,0x00,0x00,0x05,0x00,0x00,0x00,
+    0x34,0x00,0x00,0x00,0x44,0x01,0x00,0x00,0x90,0x01,0x00,0x00,0xc4,0x01,0x00,0x00,
+    0xf0,0x02,0x00,0x00,0x52,0x44,0x45,0x46,0x08,0x01,0x00,0x00,0x01,0x00,0x00,0x00,
+    0x98,0x00,0x00,0x00,0x03,0x00,0x00,0x00,0x1c,0x00,0x00,0x00,0x00,0x04,0xff,0xff,
+    0x10,0x81,0x00,0x00,0xe0,0x00,0x00,0x00,0x7c,0x00,0x00,0x00,0x03,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x01,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x89,0x00,0x00,0x00,0x02,0x00,0x00,0x00,
+    0x05,0x00,0x00,0x00,0x04,0x00,0x00,0x00,0xff,0xff,0xff,0xff,0x00,0x00,0x00,0x00,
+    0x01,0x00,0x00,0x00,0x0d,0x00,0x00,0x00,0x8d,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x01,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x5f,0x74,0x65,0x78,0x5f,0x73,0x61,0x6d,
+    0x70,0x6c,0x65,0x72,0x00,0x74,0x65,0x78,0x00,0x66,0x73,0x5f,0x70,0x61,0x72,0x61,
+    0x6d,0x73,0x00,0xab,0x8d,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0xb0,0x00,0x00,0x00,
+    0x10,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xc8,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x04,0x00,0x00,0x00,0x02,0x00,0x00,0x00,0xd0,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x5f,0x35,0x30,0x5f,0x70,0x6d,0x61,0x00,0x00,0x00,0x03,0x00,
+    0x01,0x00,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x4d,0x69,0x63,0x72,
+    0x6f,0x73,0x6f,0x66,0x74,0x20,0x28,0x52,0x29,0x20,0x48,0x4c,0x53,0x4c,0x20,0x53,
+    0x68,0x61,0x64,0x65,0x72,0x20,0x43,0x6f,0x6d,0x70,0x69,0x6c,0x65,0x72,0x20,0x31,
+    0x30,0x2e,0x31,0x00,0x49,0x53,0x47,0x4e,0x44,0x00,0x00,0x00,0x02,0x00,0x00,0x00,
+    0x08,0x00,0x00,0x00,0x38,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x03,0x00,0x00,0x38,0x00,0x00,0x00,
+    0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x00,0x00,0x00,0x01,0x00,0x00,0x00,
+    0x0f,0x0f,0x00,0x00,0x54,0x45,0x58,0x43,0x4f,0x4f,0x52,0x44,0x00,0xab,0xab,0xab,
+    0x4f,0x53,0x47,0x4e,0x2c,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x08,0x00,0x00,0x00,
+    0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x0f,0x00,0x00,0x00,0x53,0x56,0x5f,0x54,0x61,0x72,0x67,0x65,
+    0x74,0x00,0xab,0xab,0x53,0x48,0x44,0x52,0x24,0x01,0x00,0x00,0x40,0x00,0x00,0x00,
+    0x49,0x00,0x00,0x00,0x59,0x00,0x00,0x04,0x46,0x8e,0x20,0x00,0x00,0x00,0x00,0x00,
+    0x01,0x00,0x00,0x00,0x5a,0x00,0x00,0x03,0x00,0x60,0x10,0x00,0x00,0x00,0x00,0x00,
+    0x58,0x18,0x00,0x04,0x00,0x70,0x10,0x00,0x00,0x00,0x00,0x00,0x55,0x55,0x00,0x00,
+    0x62,0x10,0x00,0x03,0x32,0x10,0x10,0x00,0x00,0x00,0x00,0x00,0x62,0x10,0x00,0x03,
+    0xf2,0x10,0x10,0x00,0x01,0x00,0x00,0x00,0x65,0x00,0x00,0x03,0xf2,0x20,0x10,0x00,
+    0x00,0x00,0x00,0x00,0x68,0x00,0x00,0x02,0x02,0x00,0x00,0x00,0x45,0x00,0x00,0x09,
+    0xf2,0x00,0x10,0x00,0x00,0x00,0x00,0x00,0x46,0x10,0x10,0x00,0x00,0x00,0x00,0x00,
+    0x46,0x7e,0x10,0x00,0x00,0x00,0x00,0x00,0x00,0x60,0x10,0x00,0x00,0x00,0x00,0x00,
+    0x38,0x00,0x00,0x07,0xf2,0x00,0x10,0x00,0x00,0x00,0x00,0x00,0x46,0x0e,0x10,0x00,
+    0x00,0x00,0x00,0x00,0x46,0x1e,0x10,0x00,0x01,0x00,0x00,0x00,0x38,0x00,0x00,0x07,
+    0x72,0x00,0x10,0x00,0x01,0x00,0x00,0x00,0xf6,0x0f,0x10,0x00,0x00,0x00,0x00,0x00,
+    0x46,0x02,0x10,0x00,0x00,0x00,0x00,0x00,0x36,0x00,0x00,0x05,0x82,0x00,0x10,0x00,
+    0x01,0x00,0x00,0x00,0x3a,0x00,0x10,0x00,0x00,0x00,0x00,0x00,0x32,0x00,0x00,0x0a,
+    0xf2,0x00,0x10,0x00,0x01,0x00,0x00,0x00,0x46,0x0e,0x10,0x00,0x01,0x00,0x00,0x00,
+    0x46,0x1e,0x10,0x00,0x01,0x00,0x00,0x00,0x46,0x0e,0x10,0x80,0x41,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x32,0x00,0x00,0x0a,0xf2,0x20,0x10,0x00,0x00,0x00,0x00,0x00,
+    0x06,0x80,0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x46,0x0e,0x10,0x00,
+    0x01,0x00,0x00,0x00,0x46,0x0e,0x10,0x00,0x00,0x00,0x00,0x00,0x3e,0x00,0x00,0x01,
+    0x53,0x54,0x41,0x54,0x74,0x00,0x00,0x00,0x07,0x00,0x00,0x00,0x02,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x03,0x00,0x00,0x00,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+};
+#elif defined(SOKOL_METAL)
+static const uint8_t _sspine_vs_bytecode_metal_macos[3068] = {
+    0x4d,0x54,0x4c,0x42,0x01,0x80,0x02,0x00,0x02,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0xfc,0x0b,0x00,0x00,0x00,0x00,0x00,0x00,0x58,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x6d,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xc9,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x3b,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x04,0x01,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x08,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x0c,0x01,0x00,0x00,0x00,0x00,0x00,0x00,
+    0xf0,0x0a,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x6d,0x00,0x00,0x00,
+    0x4e,0x41,0x4d,0x45,0x06,0x00,0x6d,0x61,0x69,0x6e,0x30,0x00,0x54,0x59,0x50,0x45,
+    0x01,0x00,0x00,0x48,0x41,0x53,0x48,0x20,0x00,0x00,0x1c,0x82,0xf4,0xbb,0x79,0xa7,
+    0x30,0x7f,0x4a,0xbc,0xb6,0x93,0x11,0x29,0xf6,0x24,0x44,0x87,0xfa,0x98,0x7e,0xd3,
+    0x73,0xca,0x18,0xc6,0xe1,0x22,0x50,0x45,0x09,0x4f,0x46,0x46,0x54,0x18,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x56,0x45,0x52,0x53,0x08,0x00,0x01,0x00,0x08,
+    0x00,0x01,0x00,0x01,0x00,0x45,0x4e,0x44,0x54,0x37,0x00,0x00,0x00,0x56,0x41,0x54,
+    0x54,0x22,0x00,0x03,0x00,0x70,0x6f,0x73,0x69,0x74,0x69,0x6f,0x6e,0x00,0x00,0x80,
+    0x74,0x65,0x78,0x63,0x6f,0x6f,0x72,0x64,0x30,0x00,0x01,0x80,0x63,0x6f,0x6c,0x6f,
+    0x72,0x30,0x00,0x02,0x80,0x56,0x41,0x54,0x59,0x05,0x00,0x03,0x00,0x04,0x04,0x06,
+    0x45,0x4e,0x44,0x54,0x04,0x00,0x00,0x00,0x45,0x4e,0x44,0x54,0xde,0xc0,0x17,0x0b,
+    0x00,0x00,0x00,0x00,0x14,0x00,0x00,0x00,0xdc,0x0a,0x00,0x00,0xff,0xff,0xff,0xff,
+    0x42,0x43,0xc0,0xde,0x21,0x0c,0x00,0x00,0xb4,0x02,0x00,0x00,0x0b,0x82,0x20,0x00,
+    0x02,0x00,0x00,0x00,0x12,0x00,0x00,0x00,0x07,0x81,0x23,0x91,0x41,0xc8,0x04,0x49,
+    0x06,0x10,0x32,0x39,0x92,0x01,0x84,0x0c,0x25,0x05,0x08,0x19,0x1e,0x04,0x8b,0x62,
+    0x80,0x14,0x45,0x02,0x42,0x92,0x0b,0x42,0xa4,0x10,0x32,0x14,0x38,0x08,0x18,0x49,
+    0x0a,0x32,0x44,0x24,0x48,0x0a,0x90,0x21,0x23,0xc4,0x52,0x80,0x0c,0x19,0x21,0x72,
+    0x24,0x07,0xc8,0x48,0x11,0x62,0xa8,0xa0,0xa8,0x40,0xc6,0xf0,0x01,0x00,0x00,0x00,
+    0x51,0x18,0x00,0x00,0x81,0x00,0x00,0x00,0x1b,0xc8,0x25,0xf8,0xff,0xff,0xff,0xff,
+    0x01,0x90,0x80,0x8a,0x18,0x87,0x77,0x90,0x07,0x79,0x28,0x87,0x71,0xa0,0x07,0x76,
+    0xc8,0x87,0x36,0x90,0x87,0x77,0xa8,0x07,0x77,0x20,0x87,0x72,0x20,0x87,0x36,0x20,
+    0x87,0x74,0xb0,0x87,0x74,0x20,0x87,0x72,0x68,0x83,0x79,0x88,0x07,0x79,0xa0,0x87,
+    0x36,0x30,0x07,0x78,0x68,0x83,0x76,0x08,0x07,0x7a,0x40,0x07,0xc0,0x1c,0xc2,0x81,
+    0x1d,0xe6,0xa1,0x1c,0x00,0x82,0x1c,0xd2,0x61,0x1e,0xc2,0x41,0x1c,0xd8,0xa1,0x1c,
+    0xda,0x80,0x1e,0xc2,0x21,0x1d,0xd8,0xa1,0x0d,0xc6,0x21,0x1c,0xd8,0x81,0x1d,0xe6,
+    0x01,0x30,0x87,0x70,0x60,0x87,0x79,0x28,0x07,0x80,0x60,0x87,0x72,0x98,0x87,0x79,
+    0x68,0x03,0x78,0x90,0x87,0x72,0x18,0x87,0x74,0x98,0x87,0x72,0x68,0x03,0x73,0x80,
+    0x87,0x76,0x08,0x07,0x72,0x00,0xcc,0x21,0x1c,0xd8,0x61,0x1e,0xca,0x01,0x20,0xdc,
+    0xe1,0x1d,0xda,0xc0,0x1c,0xe4,0x21,0x1c,0xda,0xa1,0x1c,0xda,0x00,0x1e,0xde,0x21,
+    0x1d,0xdc,0x81,0x1e,0xca,0x41,0x1e,0xda,0xa0,0x1c,0xd8,0x21,0x1d,0xda,0x01,0xa0,
+    0x07,0x79,0xa8,0x87,0x72,0x00,0x06,0x77,0x78,0x87,0x36,0x30,0x07,0x79,0x08,0x87,
+    0x76,0x28,0x87,0x36,0x80,0x87,0x77,0x48,0x07,0x77,0xa0,0x87,0x72,0x90,0x87,0x36,
+    0x28,0x07,0x76,0x48,0x87,0x76,0x68,0x03,0x77,0x78,0x07,0x77,0x68,0x03,0x76,0x28,
+    0x87,0x70,0x30,0x07,0x80,0x70,0x87,0x77,0x68,0x83,0x74,0x70,0x07,0x73,0x98,0x87,
+    0x36,0x30,0x07,0x78,0x68,0x83,0x76,0x08,0x07,0x7a,0x40,0x07,0x80,0x1e,0xe4,0xa1,
+    0x1e,0xca,0x01,0x20,0xdc,0xe1,0x1d,0xda,0x40,0x1d,0xea,0xa1,0x1d,0xe0,0xa1,0x0d,
+    0xe8,0x21,0x1c,0xc4,0x81,0x1d,0xca,0x61,0x1e,0x00,0x73,0x08,0x07,0x76,0x98,0x87,
+    0x72,0x00,0x08,0x77,0x78,0x87,0x36,0x70,0x87,0x70,0x70,0x87,0x79,0x68,0x03,0x73,
+    0x80,0x87,0x36,0x68,0x87,0x70,0xa0,0x07,0x74,0x00,0xe8,0x41,0x1e,0xea,0xa1,0x1c,
+    0x00,0xc2,0x1d,0xde,0xa1,0x0d,0xe6,0x21,0x1d,0xce,0xc1,0x1d,0xca,0x81,0x1c,0xda,
+    0x40,0x1f,0xca,0x41,0x1e,0xde,0x61,0x1e,0xda,0xc0,0x1c,0xe0,0xa1,0x0d,0xda,0x21,
+    0x1c,0xe8,0x01,0x1d,0x00,0x7a,0x90,0x87,0x7a,0x28,0x07,0x80,0x70,0x87,0x77,0x68,
+    0x03,0x7a,0x90,0x87,0x70,0x80,0x07,0x78,0x48,0x07,0x77,0x38,0x87,0x36,0x68,0x87,
+    0x70,0xa0,0x07,0x74,0x00,0xe8,0x41,0x1e,0xea,0xa1,0x1c,0x00,0x62,0x1e,0xe8,0x21,
+    0x1c,0xc6,0x61,0x1d,0xda,0x00,0x1e,0xe4,0xe1,0x1d,0xe8,0xa1,0x1c,0xc6,0x81,0x1e,
+    0xde,0x41,0x1e,0xda,0x40,0x1c,0xea,0xc1,0x1c,0xcc,0xa1,0x1c,0xe4,0xa1,0x0d,0xe6,
+    0x21,0x1d,0xf4,0xa1,0x1c,0x00,0x3c,0x00,0x88,0x7a,0x70,0x87,0x79,0x08,0x07,0x73,
+    0x28,0x87,0x36,0x30,0x07,0x78,0x68,0x83,0x76,0x08,0x07,0x7a,0x40,0x07,0x80,0x1e,
+    0xe4,0xa1,0x1e,0xca,0x01,0x20,0xea,0x61,0x1e,0xca,0xa1,0x0d,0xe6,0xe1,0x1d,0xcc,
+    0x81,0x1e,0xda,0xc0,0x1c,0xd8,0xe1,0x1d,0xc2,0x81,0x1e,0x00,0x73,0x08,0x07,0x76,
+    0x98,0x87,0x72,0x00,0x36,0x18,0x02,0x01,0x2c,0x40,0x05,0x00,0x49,0x18,0x00,0x00,
+    0x01,0x00,0x00,0x00,0x13,0x84,0x40,0x00,0x89,0x20,0x00,0x00,0x1f,0x00,0x00,0x00,
+    0x32,0x22,0x48,0x09,0x20,0x64,0x85,0x04,0x93,0x22,0xa4,0x84,0x04,0x93,0x22,0xe3,
+    0x84,0xa1,0x90,0x14,0x12,0x4c,0x8a,0x8c,0x0b,0x84,0xa4,0x4c,0x10,0x44,0x33,0x00,
+    0xc3,0x08,0x02,0x30,0x8c,0x40,0x00,0x76,0x08,0x42,0x24,0x81,0x98,0x89,0x9a,0x07,
+    0x7a,0x90,0x87,0x7a,0x18,0x07,0x7a,0x70,0x83,0x76,0x28,0x07,0x7a,0x08,0x07,0x76,
+    0xd0,0x03,0x3d,0x68,0x87,0x70,0xa0,0x07,0x79,0x48,0x07,0x7c,0x40,0x01,0x39,0x48,
+    0x9a,0x22,0x4a,0x98,0xfc,0x4a,0xfa,0x1f,0x20,0x02,0x18,0x09,0x05,0x65,0x10,0xc1,
+    0x10,0x4a,0x31,0x42,0x10,0x87,0xd0,0x40,0xc0,0x1c,0x01,0x18,0xa4,0xc0,0x9a,0x23,
+    0x00,0x85,0x41,0x04,0x41,0x18,0x46,0x20,0x96,0x11,0x00,0x00,0x13,0xb2,0x70,0x48,
+    0x07,0x79,0xb0,0x03,0x3a,0x68,0x83,0x70,0x80,0x07,0x78,0x60,0x87,0x72,0x68,0x83,
+    0x76,0x08,0x87,0x71,0x78,0x87,0x79,0xc0,0x87,0x38,0x80,0x03,0x37,0x88,0x83,0x38,
+    0x70,0x03,0x38,0xd8,0x70,0x1b,0xe5,0xd0,0x06,0xf0,0xa0,0x07,0x76,0x40,0x07,0x7a,
+    0x60,0x07,0x74,0xa0,0x07,0x76,0x40,0x07,0x6d,0x90,0x0e,0x71,0xa0,0x07,0x78,0xa0,
+    0x07,0x78,0xd0,0x06,0xe9,0x80,0x07,0x7a,0x80,0x07,0x7a,0x80,0x07,0x6d,0x90,0x0e,
+    0x71,0x60,0x07,0x7a,0x10,0x07,0x76,0xa0,0x07,0x71,0x60,0x07,0x6d,0x90,0x0e,0x73,
+    0x20,0x07,0x7a,0x30,0x07,0x72,0xa0,0x07,0x73,0x20,0x07,0x6d,0x90,0x0e,0x76,0x40,
+    0x07,0x7a,0x60,0x07,0x74,0xa0,0x07,0x76,0x40,0x07,0x6d,0x60,0x0e,0x73,0x20,0x07,
+    0x7a,0x30,0x07,0x72,0xa0,0x07,0x73,0x20,0x07,0x6d,0x60,0x0e,0x76,0x40,0x07,0x7a,
+    0x60,0x07,0x74,0xa0,0x07,0x76,0x40,0x07,0x6d,0x60,0x0f,0x71,0x60,0x07,0x7a,0x10,
+    0x07,0x76,0xa0,0x07,0x71,0x60,0x07,0x6d,0x60,0x0f,0x72,0x40,0x07,0x7a,0x30,0x07,
+    0x72,0xa0,0x07,0x73,0x20,0x07,0x6d,0x60,0x0f,0x73,0x20,0x07,0x7a,0x30,0x07,0x72,
+    0xa0,0x07,0x73,0x20,0x07,0x6d,0x60,0x0f,0x74,0x80,0x07,0x7a,0x60,0x07,0x74,0xa0,
+    0x07,0x76,0x40,0x07,0x6d,0x60,0x0f,0x76,0x40,0x07,0x7a,0x60,0x07,0x74,0xa0,0x07,
+    0x76,0x40,0x07,0x6d,0x60,0x0f,0x79,0x60,0x07,0x7a,0x10,0x07,0x72,0x80,0x07,0x7a,
+    0x10,0x07,0x72,0x80,0x07,0x6d,0x60,0x0f,0x71,0x20,0x07,0x78,0xa0,0x07,0x71,0x20,
+    0x07,0x78,0xa0,0x07,0x71,0x20,0x07,0x78,0xd0,0x06,0xf6,0x10,0x07,0x79,0x20,0x07,
+    0x7a,0x20,0x07,0x75,0x60,0x07,0x7a,0x20,0x07,0x75,0x60,0x07,0x6d,0x60,0x0f,0x72,
+    0x50,0x07,0x76,0xa0,0x07,0x72,0x50,0x07,0x76,0xa0,0x07,0x72,0x50,0x07,0x76,0xd0,
+    0x06,0xf6,0x50,0x07,0x71,0x20,0x07,0x7a,0x50,0x07,0x71,0x20,0x07,0x7a,0x50,0x07,
+    0x71,0x20,0x07,0x6d,0x60,0x0f,0x71,0x00,0x07,0x72,0x40,0x07,0x7a,0x10,0x07,0x70,
+    0x20,0x07,0x74,0xa0,0x07,0x71,0x00,0x07,0x72,0x40,0x07,0x6d,0xe0,0x0e,0x78,0xa0,
+    0x07,0x71,0x60,0x07,0x7a,0x30,0x07,0x72,0x30,0x84,0x49,0x00,0x00,0x08,0x00,0x00,
+    0x00,0x00,0x00,0xc8,0x02,0x01,0x00,0x00,0x0a,0x00,0x00,0x00,0x32,0x1e,0x98,0x10,
+    0x19,0x11,0x4c,0x90,0x8c,0x09,0x26,0x47,0xc6,0x04,0x43,0x5a,0x25,0x30,0x02,0x50,
+    0x04,0x05,0x18,0x50,0x08,0x05,0x51,0x06,0x05,0x42,0x6d,0x04,0x80,0xd8,0x58,0x02,
+    0x33,0x00,0x00,0x00,0x79,0x18,0x00,0x00,0xea,0x00,0x00,0x00,0x1a,0x03,0x4c,0x10,
+    0x97,0x29,0xa2,0x25,0x10,0xab,0x32,0xb9,0xb9,0xb4,0x37,0xb7,0x21,0xc6,0x32,0x28,
+    0x00,0xa3,0x50,0xb9,0x1b,0x43,0x0b,0x93,0xfb,0x9a,0x4b,0xd3,0x2b,0x1b,0x62,0x2c,
+    0x81,0x22,0x2c,0x05,0xe3,0x20,0x08,0x0e,0x8e,0xad,0x0c,0xa4,0xad,0x8c,0x2e,0x8c,
+    0x0d,0xc4,0xae,0x4c,0x6e,0x2e,0xed,0xcd,0x0d,0x64,0x26,0x06,0x06,0x26,0xc6,0xa5,
+    0x46,0x46,0x06,0x04,0xa5,0xad,0x8c,0x2e,0x8c,0xcd,0xac,0xac,0x65,0x26,0x06,0x06,
+    0x26,0xc6,0xa5,0x46,0x46,0x26,0x65,0x88,0xa0,0x10,0x43,0x8c,0x25,0x58,0x8c,0x45,
+    0x60,0xd1,0x54,0x46,0x17,0xc6,0x36,0x04,0x51,0x8e,0x25,0x58,0x82,0x45,0xe0,0x16,
+    0x96,0x26,0xe7,0x32,0xf6,0xd6,0x06,0x97,0xc6,0x56,0xe6,0x42,0x56,0xe6,0xf6,0x26,
+    0xd7,0x36,0xf7,0x45,0x96,0x36,0x17,0x26,0xc6,0x56,0x36,0x44,0x50,0x12,0x72,0x61,
+    0x69,0x72,0x2e,0x63,0x6f,0x6d,0x70,0x69,0x6c,0x65,0x2e,0x66,0x61,0x73,0x74,0x5f,
+    0x6d,0x61,0x74,0x68,0x5f,0x65,0x6e,0x61,0x62,0x6c,0x65,0x43,0x04,0x65,0x61,0x19,
+    0x84,0xa5,0xc9,0xb9,0x8c,0xbd,0xb5,0xc1,0xa5,0xb1,0x95,0xb9,0x98,0xc9,0x85,0xb5,
+    0x95,0x89,0xd5,0x99,0x99,0x95,0xc9,0x7d,0x99,0x95,0xd1,0x8d,0xa1,0x7d,0x91,0xa5,
+    0xcd,0x85,0x89,0xb1,0x95,0x0d,0x11,0x94,0x86,0x51,0x58,0x9a,0x9c,0x8b,0x5d,0x99,
+    0x1c,0x5d,0x19,0xde,0xd7,0x5b,0x1d,0x1d,0x5c,0x1d,0x1d,0x97,0xba,0xb9,0x32,0x39,
+    0x14,0xb6,0xb7,0x31,0x37,0x98,0x14,0x46,0x61,0x69,0x72,0x2e,0x61,0x72,0x67,0x5f,
+    0x74,0x79,0x70,0x65,0x5f,0x6e,0x61,0x6d,0x65,0x34,0xcc,0xd8,0xde,0xc2,0xe8,0x64,
+    0xc8,0x84,0xa5,0xc9,0xb9,0x84,0xc9,0x9d,0x7d,0xb9,0x85,0xb5,0x95,0x51,0xa8,0xb3,
+    0x1b,0xc2,0x28,0x8f,0x02,0x29,0x91,0x22,0x29,0x93,0x42,0x71,0xa9,0x9b,0x2b,0x93,
+    0x43,0x61,0x7b,0x1b,0x73,0x8b,0x49,0xa1,0x61,0xc6,0xf6,0x16,0x46,0x47,0xc3,0x62,
+    0xec,0x8d,0xed,0x4d,0x6e,0x08,0xa3,0x3c,0x8a,0xa5,0x44,0xca,0xa5,0x4c,0x0a,0x46,
+    0x26,0x2c,0x4d,0xce,0x05,0xee,0x6d,0x2e,0x8d,0x2e,0xed,0xcd,0x8d,0xcb,0x19,0xdb,
+    0x17,0xd4,0xdb,0x5c,0x1a,0x5d,0xda,0x9b,0xdb,0x10,0x45,0xd1,0x94,0x48,0xb9,0x94,
+    0x49,0xd9,0x86,0x18,0x4a,0xa5,0x64,0x0a,0x47,0x28,0x2c,0x4d,0xce,0xc5,0xae,0x4c,
+    0x8e,0xae,0x0c,0xef,0x2b,0xcd,0x0d,0xae,0x8e,0x8e,0x52,0x58,0x9a,0x9c,0x0b,0xdb,
+    0xdb,0x58,0x18,0x5d,0xda,0x9b,0xdb,0x57,0x9a,0x1b,0x59,0x19,0x1e,0xbd,0xb3,0x32,
+    0xb7,0x32,0xb9,0x30,0xba,0x32,0x32,0x94,0xaf,0xaf,0xb0,0x34,0xb9,0x2f,0x38,0xb6,
+    0xb0,0xb1,0x32,0xb4,0x37,0x36,0xb2,0x32,0xb9,0xaf,0xaf,0x14,0x22,0x70,0x6f,0x73,
+    0x69,0x74,0x69,0x6f,0x6e,0x43,0xa8,0x45,0x50,0x3c,0xe5,0x5b,0x84,0x25,0x50,0xc0,
+    0x40,0x89,0x14,0x49,0x99,0x94,0x30,0x60,0x42,0x57,0x86,0x37,0xf6,0xf6,0x26,0x47,
+    0x06,0x33,0x84,0x5a,0x02,0xc5,0x53,0xbe,0x25,0x58,0x02,0x05,0x0c,0x94,0x48,0x91,
+    0x94,0x49,0x19,0x03,0x1a,0x63,0x6f,0x6c,0x6f,0x72,0x30,0x43,0xa8,0x65,0x50,0x3c,
+    0xe5,0x5b,0x86,0x25,0x50,0xc0,0x40,0x89,0x94,0x4b,0x99,0x94,0x32,0xa0,0x12,0x96,
+    0x26,0xe7,0x22,0x56,0x67,0x66,0x56,0x26,0xc7,0x27,0x2c,0x4d,0xce,0x45,0xac,0xce,
+    0xcc,0xac,0x4c,0xee,0x6b,0x2e,0x4d,0xaf,0x8c,0x48,0x58,0x9a,0x9c,0x8b,0x5c,0x59,
+    0x18,0x19,0xa9,0xb0,0x34,0x39,0x97,0x39,0x3a,0xb9,0xba,0x31,0xba,0x2f,0xba,0x3c,
+    0xb8,0xb2,0xaf,0x34,0x37,0xb3,0x37,0x22,0x66,0x6c,0x6f,0x61,0x74,0x34,0x78,0x34,
+    0x1c,0xda,0xec,0xe0,0x86,0x28,0x8b,0xb0,0x10,0x8b,0xa0,0xac,0x81,0xc2,0x06,0x8c,
+    0xc2,0xd2,0xe4,0x5c,0xc2,0xe4,0xce,0xbe,0xe8,0xf2,0xe0,0xca,0xbe,0xe6,0xd2,0xf4,
+    0xca,0x78,0x85,0xa5,0xc9,0xb9,0x84,0xc9,0x9d,0x7d,0xd1,0xe5,0xc1,0x95,0x7d,0x85,
+    0xb1,0xa5,0x9d,0xb9,0x7d,0xcd,0xa5,0xe9,0x95,0x31,0xb1,0x9b,0xfb,0x82,0x0b,0x93,
+    0x0b,0x6b,0x9b,0xe3,0xf0,0x25,0x13,0x33,0x84,0x0c,0x96,0x43,0x39,0x03,0x05,0x0d,
+    0x16,0x42,0xf9,0x16,0x61,0x09,0x94,0x34,0x50,0xd4,0x40,0x69,0x03,0xc5,0x0d,0x16,
+    0x42,0x79,0x83,0x05,0x51,0x22,0x05,0x0e,0x94,0x49,0x89,0x83,0x21,0x88,0x22,0x06,
+    0x0a,0x19,0x28,0x66,0xa0,0xc8,0xc1,0x10,0x23,0x01,0x94,0x4e,0x99,0x03,0x3e,0x6f,
+    0x6d,0x6e,0x69,0x70,0x6f,0x74,0x65,0x6e,0x74,0x20,0x63,0x68,0x61,0x72,0x7c,0xa6,
+    0xd2,0xda,0xe0,0xd8,0xca,0x40,0x86,0x56,0x56,0x40,0xa8,0x84,0x82,0x82,0x86,0x08,
+    0x8a,0x1d,0x0c,0x31,0x94,0x3a,0x50,0xee,0xa0,0x49,0x86,0x18,0x0a,0x1e,0x28,0x78,
+    0xd0,0x24,0x23,0x22,0x76,0x60,0x07,0x7b,0x68,0x07,0x37,0x68,0x87,0x77,0x20,0x87,
+    0x7a,0x60,0x87,0x72,0x70,0x03,0x73,0x60,0x87,0x70,0x38,0x87,0x79,0x98,0x22,0x04,
+    0xc3,0x08,0x85,0x1d,0xd8,0xc1,0x1e,0xda,0xc1,0x0d,0xd2,0x81,0x1c,0xca,0xc1,0x1d,
+    0xe8,0x61,0x4a,0x50,0x8c,0x58,0xc2,0x21,0x1d,0xe4,0xc1,0x0d,0xec,0xa1,0x1c,0xe4,
+    0x61,0x1e,0xd2,0xe1,0x1d,0xdc,0x61,0x4a,0x60,0x8c,0xa0,0xc2,0x21,0x1d,0xe4,0xc1,
+    0x0d,0xd8,0x21,0x1c,0xdc,0xe1,0x1c,0xea,0x21,0x1c,0xce,0xa1,0x1c,0x7e,0xc1,0x1e,
+    0xca,0x41,0x1e,0xe6,0x21,0x1d,0xde,0xc1,0x1d,0xa6,0x04,0xc8,0x88,0x29,0x1c,0xd2,
+    0x41,0x1e,0xdc,0x60,0x1c,0xde,0xa1,0x1d,0xe0,0x21,0x1d,0xd8,0xa1,0x1c,0x7e,0xe1,
+    0x1d,0xe0,0x81,0x1e,0xd2,0xe1,0x1d,0xdc,0x61,0x1e,0xa6,0x0c,0x0a,0xe3,0x8c,0x50,
+    0xc2,0x21,0x1d,0xe4,0xc1,0x0d,0xec,0xa1,0x1c,0xe4,0x81,0x1e,0xca,0x01,0x1f,0xa6,
+    0x04,0x74,0x00,0x00,0x79,0x18,0x00,0x00,0x7b,0x00,0x00,0x00,0x33,0x08,0x80,0x1c,
+    0xc4,0xe1,0x1c,0x66,0x14,0x01,0x3d,0x88,0x43,0x38,0x84,0xc3,0x8c,0x42,0x80,0x07,
+    0x79,0x78,0x07,0x73,0x98,0x71,0x0c,0xe6,0x00,0x0f,0xed,0x10,0x0e,0xf4,0x80,0x0e,
+    0x33,0x0c,0x42,0x1e,0xc2,0xc1,0x1d,0xce,0xa1,0x1c,0x66,0x30,0x05,0x3d,0x88,0x43,
+    0x38,0x84,0x83,0x1b,0xcc,0x03,0x3d,0xc8,0x43,0x3d,0x8c,0x03,0x3d,0xcc,0x78,0x8c,
+    0x74,0x70,0x07,0x7b,0x08,0x07,0x79,0x48,0x87,0x70,0x70,0x07,0x7a,0x70,0x03,0x76,
+    0x78,0x87,0x70,0x20,0x87,0x19,0xcc,0x11,0x0e,0xec,0x90,0x0e,0xe1,0x30,0x0f,0x6e,
+    0x30,0x0f,0xe3,0xf0,0x0e,0xf0,0x50,0x0e,0x33,0x10,0xc4,0x1d,0xde,0x21,0x1c,0xd8,
+    0x21,0x1d,0xc2,0x61,0x1e,0x66,0x30,0x89,0x3b,0xbc,0x83,0x3b,0xd0,0x43,0x39,0xb4,
+    0x03,0x3c,0xbc,0x83,0x3c,0x84,0x03,0x3b,0xcc,0xf0,0x14,0x76,0x60,0x07,0x7b,0x68,
+    0x07,0x37,0x68,0x87,0x72,0x68,0x07,0x37,0x80,0x87,0x70,0x90,0x87,0x70,0x60,0x07,
+    0x76,0x28,0x07,0x76,0xf8,0x05,0x76,0x78,0x87,0x77,0x80,0x87,0x5f,0x08,0x87,0x71,
+    0x18,0x87,0x72,0x98,0x87,0x79,0x98,0x81,0x2c,0xee,0xf0,0x0e,0xee,0xe0,0x0e,0xf5,
+    0xc0,0x0e,0xec,0x30,0x03,0x62,0xc8,0xa1,0x1c,0xe4,0xa1,0x1c,0xcc,0xa1,0x1c,0xe4,
+    0xa1,0x1c,0xdc,0x61,0x1c,0xca,0x21,0x1c,0xc4,0x81,0x1d,0xca,0x61,0x06,0xd6,0x90,
+    0x43,0x39,0xc8,0x43,0x39,0x98,0x43,0x39,0xc8,0x43,0x39,0xb8,0xc3,0x38,0x94,0x43,
+    0x38,0x88,0x03,0x3b,0x94,0xc3,0x2f,0xbc,0x83,0x3c,0xfc,0x82,0x3b,0xd4,0x03,0x3b,
+    0xb0,0xc3,0x0c,0xc7,0x69,0x87,0x70,0x58,0x87,0x72,0x70,0x83,0x74,0x68,0x07,0x78,
+    0x60,0x87,0x74,0x18,0x87,0x74,0xa0,0x87,0x19,0xce,0x53,0x0f,0xee,0x00,0x0f,0xf2,
+    0x50,0x0e,0xe4,0x90,0x0e,0xe3,0x40,0x0f,0xe1,0x20,0x0e,0xec,0x50,0x0e,0x33,0x20,
+    0x28,0x1d,0xdc,0xc1,0x1e,0xc2,0x41,0x1e,0xd2,0x21,0x1c,0xdc,0x81,0x1e,0xdc,0xe0,
+    0x1c,0xe4,0xe1,0x1d,0xea,0x01,0x1e,0x66,0x18,0x51,0x38,0xb0,0x43,0x3a,0x9c,0x83,
+    0x3b,0xcc,0x50,0x24,0x76,0x60,0x07,0x7b,0x68,0x07,0x37,0x60,0x87,0x77,0x78,0x07,
+    0x78,0x98,0x51,0x4c,0xf4,0x90,0x0f,0xf0,0x50,0x0e,0x33,0x1e,0x6a,0x1e,0xca,0x61,
+    0x1c,0xe8,0x21,0x1d,0xde,0xc1,0x1d,0x7e,0x01,0x1e,0xe4,0xa1,0x1c,0xcc,0x21,0x1d,
+    0xf0,0x61,0x06,0x54,0x85,0x83,0x38,0xcc,0xc3,0x3b,0xb0,0x43,0x3d,0xd0,0x43,0x39,
+    0xfc,0xc2,0x3c,0xe4,0x43,0x3b,0x88,0xc3,0x3b,0xb0,0xc3,0x8c,0xc5,0x0a,0x87,0x79,
+    0x98,0x87,0x77,0x18,0x87,0x74,0x08,0x07,0x7a,0x28,0x07,0x72,0x98,0x81,0x5c,0xe3,
+    0x10,0x0e,0xec,0xc0,0x0e,0xe5,0x50,0x0e,0xf3,0x30,0x23,0xc1,0xd2,0x41,0x1e,0xe4,
+    0xe1,0x17,0xd8,0xe1,0x1d,0xde,0x01,0x1e,0x66,0x50,0x59,0x38,0xa4,0x83,0x3c,0xb8,
+    0x81,0x39,0xd4,0x83,0x3b,0x8c,0x03,0x3d,0xa4,0xc3,0x3b,0xb8,0xc3,0x2f,0x9c,0x83,
+    0x3c,0xbc,0x43,0x3d,0xc0,0xc3,0x3c,0x00,0x71,0x20,0x00,0x00,0x02,0x00,0x00,0x00,
+    0x06,0x50,0x30,0x00,0xd2,0xd0,0x00,0x00,0x61,0x20,0x00,0x00,0x1e,0x00,0x00,0x00,
+    0x13,0x04,0x41,0x2c,0x10,0x00,0x00,0x00,0x05,0x00,0x00,0x00,0xf4,0xc6,0x22,0x82,
+    0x20,0x08,0x46,0x00,0xa8,0x95,0x40,0x19,0xd0,0x98,0x01,0xa0,0x30,0x03,0x00,0x00,
+    0xe3,0x15,0x07,0x33,0x4d,0x0c,0x05,0x65,0x90,0x81,0x19,0x0e,0x13,0x02,0xf9,0x8c,
+    0x57,0x2c,0xd0,0x75,0x21,0x14,0x94,0x41,0x06,0xe8,0x60,0x4c,0x08,0xe4,0x63,0x41,
+    0x01,0x9f,0xf1,0x0a,0xa8,0xe2,0x38,0x86,0x82,0x62,0x43,0x00,0x9f,0xd9,0x06,0xa7,
+    0x02,0x66,0x1b,0x82,0x2a,0x98,0x6d,0x08,0x06,0x21,0x83,0x80,0x18,0x00,0x00,0x00,
+    0x04,0x00,0x00,0x00,0x5b,0x86,0x20,0xc8,0x83,0x2d,0x43,0x11,0xe4,0xc1,0x96,0x41,
+    0x09,0xf2,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+};
+static const uint8_t _sspine_fs_bytecode_metal_macos[3257] = {
+    0x4d,0x54,0x4c,0x42,0x01,0x80,0x02,0x00,0x02,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0xb9,0x0c,0x00,0x00,0x00,0x00,0x00,0x00,0x58,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x6d,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xc9,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x08,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xd1,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x08,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xd9,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0xe0,0x0b,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x6d,0x00,0x00,0x00,
+    0x4e,0x41,0x4d,0x45,0x06,0x00,0x6d,0x61,0x69,0x6e,0x30,0x00,0x54,0x59,0x50,0x45,
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+    0xa6,0x6c,0x82,0x26,0x6d,0x92,0xa6,0x8d,0x4b,0xdd,0x5c,0x99,0x1c,0x0a,0xdb,0xdb,
+    0x98,0x5b,0x4c,0x0a,0x8b,0xb1,0x37,0xb6,0x37,0xb9,0x21,0xd2,0x43,0x4c,0xd6,0xd4,
+    0x4d,0xd8,0x94,0x4d,0xd0,0x14,0x4d,0xd2,0xe4,0x51,0x09,0x4b,0x93,0x73,0x11,0xab,
+    0x33,0x33,0x2b,0x93,0xe3,0x13,0x96,0x26,0xe7,0x22,0x56,0x67,0x66,0x56,0x26,0xf7,
+    0x35,0x97,0xa6,0x57,0x46,0x29,0x2c,0x4d,0xce,0x85,0xed,0x6d,0x2c,0x8c,0x2e,0xed,
+    0xcd,0xed,0x2b,0xcd,0x8d,0xac,0x0c,0x8f,0x48,0x58,0x9a,0x9c,0x8b,0x5c,0x59,0x18,
+    0x19,0xa9,0xb0,0x34,0x39,0x97,0x39,0x3a,0xb9,0xba,0x31,0xba,0x2f,0xba,0x3c,0xb8,
+    0xb2,0xaf,0x34,0x37,0xb3,0x37,0x16,0x66,0x6c,0x6f,0x61,0x74,0x1c,0xe0,0xda,0xc2,
+    0x86,0x28,0xcf,0xf0,0x14,0xcf,0x30,0x95,0xc1,0x64,0x06,0x8c,0xc2,0xd2,0xe4,0x5c,
+    0xc2,0xe4,0xce,0xbe,0xe8,0xf2,0xe0,0xca,0xbe,0xe6,0xd2,0xf4,0xca,0x78,0x85,0xa5,
+    0xc9,0xb9,0x84,0xc9,0x9d,0x7d,0xd1,0xe5,0xc1,0x95,0x7d,0x85,0xb1,0xa5,0x9d,0xb9,
+    0x7d,0xcd,0xa5,0xe9,0x95,0x31,0x31,0x9b,0xfb,0x82,0x0b,0x93,0x0b,0x6b,0x9b,0xe3,
+    0xf0,0x55,0x03,0x33,0x84,0x0c,0x1e,0x63,0x02,0x83,0x29,0x0c,0x9e,0x62,0x12,0x83,
+    0x67,0x78,0x88,0x69,0x0c,0x26,0x32,0x98,0xce,0x60,0x42,0x83,0xa7,0x98,0xd2,0xe0,
+    0x29,0x26,0x68,0x52,0x83,0x49,0x9a,0xd6,0x80,0x4b,0x58,0x9a,0x9c,0x0b,0x5d,0x19,
+    0x1e,0x5d,0x9d,0x5c,0x19,0x95,0xb0,0x34,0x39,0x97,0xb9,0xb0,0x36,0x38,0xb6,0x32,
+    0x62,0x74,0x65,0x78,0x74,0x75,0x72,0x65,0x32,0x64,0x3c,0x66,0x6c,0x6f,0x61,0x74,
+    0x2c,0x20,0x73,0x61,0x6d,0x70,0x6c,0x65,0x3e,0x1c,0xe8,0xca,0xf0,0x86,0x50,0x0f,
+    0x32,0xb5,0xc1,0x24,0x06,0xcf,0xf0,0x10,0x93,0x1b,0x4c,0xd0,0xf4,0x06,0x93,0x34,
+    0xc1,0x01,0x97,0xb0,0x34,0x39,0x97,0xb9,0xb0,0x36,0x38,0xb6,0x32,0x39,0x1e,0x73,
+    0x61,0x6d,0x70,0x6c,0x65,0x72,0x44,0xe8,0xca,0xf0,0xa6,0xda,0xe0,0xd8,0xe4,0x86,
+    0x48,0x4f,0x31,0xc9,0xc1,0x24,0x06,0xcf,0xf0,0x10,0x13,0x34,0xcd,0xc1,0x24,0x4d,
+    0x74,0x30,0x44,0x99,0xb8,0xe9,0x9b,0xd8,0x60,0x8a,0x83,0xa9,0x0e,0x86,0x18,0x0b,
+    0x30,0x55,0x93,0x1d,0xd0,0xf9,0xd2,0xa2,0x9a,0xca,0x31,0x9b,0xfb,0x82,0x0b,0x93,
+    0x0b,0x6b,0x9b,0xe3,0xf3,0xd6,0xe6,0x96,0x06,0xf7,0x46,0x57,0xe6,0x46,0x07,0x32,
+    0x86,0x16,0x26,0xc7,0x67,0x2a,0xad,0x0d,0x8e,0xad,0x0c,0x64,0x68,0x65,0x05,0x84,
+    0x4a,0x28,0x28,0x68,0x88,0x30,0xe9,0xc1,0x10,0x63,0xca,0x83,0x69,0x0f,0xb0,0x64,
+    0x88,0x31,0x95,0xc1,0xc4,0x07,0x58,0x32,0xc4,0x98,0xf0,0x60,0xea,0x03,0x2c,0x19,
+    0x62,0x4c,0x7e,0x30,0xf5,0x01,0x96,0x8c,0x88,0xd8,0x81,0x1d,0xec,0xa1,0x1d,0xdc,
+    0xa0,0x1d,0xde,0x81,0x1c,0xea,0x81,0x1d,0xca,0xc1,0x0d,0xcc,0x81,0x1d,0xc2,0xe1,
+    0x1c,0xe6,0x61,0x8a,0x10,0x0c,0x23,0x14,0x76,0x60,0x07,0x7b,0x68,0x07,0x37,0x48,
+    0x07,0x72,0x28,0x07,0x77,0xa0,0x87,0x29,0x41,0x31,0x62,0x09,0x87,0x74,0x90,0x07,
+    0x37,0xb0,0x87,0x72,0x90,0x87,0x79,0x48,0x87,0x77,0x70,0x87,0x29,0x81,0x31,0x82,
+    0x0a,0x87,0x74,0x90,0x07,0x37,0x60,0x87,0x70,0x70,0x87,0x73,0xa8,0x87,0x70,0x38,
+    0x87,0x72,0xf8,0x05,0x7b,0x28,0x07,0x79,0x98,0x87,0x74,0x78,0x07,0x77,0x98,0x12,
+    0x20,0x23,0xa6,0x70,0x48,0x07,0x79,0x70,0x83,0x71,0x78,0x87,0x76,0x80,0x87,0x74,
+    0x60,0x87,0x72,0xf8,0x85,0x77,0x80,0x07,0x7a,0x48,0x87,0x77,0x70,0x87,0x79,0x98,
+    0x32,0x28,0x8c,0x33,0x82,0x09,0x87,0x74,0x90,0x07,0x37,0x30,0x07,0x79,0x08,0x87,
+    0x73,0x68,0x87,0x72,0x70,0x07,0x7a,0x98,0x12,0xdc,0x01,0x00,0x00,0x79,0x18,0x00,
+    0x00,0x7b,0x00,0x00,0x00,0x33,0x08,0x80,0x1c,0xc4,0xe1,0x1c,0x66,0x14,0x01,0x3d,
+    0x88,0x43,0x38,0x84,0xc3,0x8c,0x42,0x80,0x07,0x79,0x78,0x07,0x73,0x98,0x71,0x0c,
+    0xe6,0x00,0x0f,0xed,0x10,0x0e,0xf4,0x80,0x0e,0x33,0x0c,0x42,0x1e,0xc2,0xc1,0x1d,
+    0xce,0xa1,0x1c,0x66,0x30,0x05,0x3d,0x88,0x43,0x38,0x84,0x83,0x1b,0xcc,0x03,0x3d,
+    0xc8,0x43,0x3d,0x8c,0x03,0x3d,0xcc,0x78,0x8c,0x74,0x70,0x07,0x7b,0x08,0x07,0x79,
+    0x48,0x87,0x70,0x70,0x07,0x7a,0x70,0x03,0x76,0x78,0x87,0x70,0x20,0x87,0x19,0xcc,
+    0x11,0x0e,0xec,0x90,0x0e,0xe1,0x30,0x0f,0x6e,0x30,0x0f,0xe3,0xf0,0x0e,0xf0,0x50,
+    0x0e,0x33,0x10,0xc4,0x1d,0xde,0x21,0x1c,0xd8,0x21,0x1d,0xc2,0x61,0x1e,0x66,0x30,
+    0x89,0x3b,0xbc,0x83,0x3b,0xd0,0x43,0x39,0xb4,0x03,0x3c,0xbc,0x83,0x3c,0x84,0x03,
+    0x3b,0xcc,0xf0,0x14,0x76,0x60,0x07,0x7b,0x68,0x07,0x37,0x68,0x87,0x72,0x68,0x07,
+    0x37,0x80,0x87,0x70,0x90,0x87,0x70,0x60,0x07,0x76,0x28,0x07,0x76,0xf8,0x05,0x76,
+    0x78,0x87,0x77,0x80,0x87,0x5f,0x08,0x87,0x71,0x18,0x87,0x72,0x98,0x87,0x79,0x98,
+    0x81,0x2c,0xee,0xf0,0x0e,0xee,0xe0,0x0e,0xf5,0xc0,0x0e,0xec,0x30,0x03,0x62,0xc8,
+    0xa1,0x1c,0xe4,0xa1,0x1c,0xcc,0xa1,0x1c,0xe4,0xa1,0x1c,0xdc,0x61,0x1c,0xca,0x21,
+    0x1c,0xc4,0x81,0x1d,0xca,0x61,0x06,0xd6,0x90,0x43,0x39,0xc8,0x43,0x39,0x98,0x43,
+    0x39,0xc8,0x43,0x39,0xb8,0xc3,0x38,0x94,0x43,0x38,0x88,0x03,0x3b,0x94,0xc3,0x2f,
+    0xbc,0x83,0x3c,0xfc,0x82,0x3b,0xd4,0x03,0x3b,0xb0,0xc3,0x0c,0xc7,0x69,0x87,0x70,
+    0x58,0x87,0x72,0x70,0x83,0x74,0x68,0x07,0x78,0x60,0x87,0x74,0x18,0x87,0x74,0xa0,
+    0x87,0x19,0xce,0x53,0x0f,0xee,0x00,0x0f,0xf2,0x50,0x0e,0xe4,0x90,0x0e,0xe3,0x40,
+    0x0f,0xe1,0x20,0x0e,0xec,0x50,0x0e,0x33,0x20,0x28,0x1d,0xdc,0xc1,0x1e,0xc2,0x41,
+    0x1e,0xd2,0x21,0x1c,0xdc,0x81,0x1e,0xdc,0xe0,0x1c,0xe4,0xe1,0x1d,0xea,0x01,0x1e,
+    0x66,0x18,0x51,0x38,0xb0,0x43,0x3a,0x9c,0x83,0x3b,0xcc,0x50,0x24,0x76,0x60,0x07,
+    0x7b,0x68,0x07,0x37,0x60,0x87,0x77,0x78,0x07,0x78,0x98,0x51,0x4c,0xf4,0x90,0x0f,
+    0xf0,0x50,0x0e,0x33,0x1e,0x6a,0x1e,0xca,0x61,0x1c,0xe8,0x21,0x1d,0xde,0xc1,0x1d,
+    0x7e,0x01,0x1e,0xe4,0xa1,0x1c,0xcc,0x21,0x1d,0xf0,0x61,0x06,0x54,0x85,0x83,0x38,
+    0xcc,0xc3,0x3b,0xb0,0x43,0x3d,0xd0,0x43,0x39,0xfc,0xc2,0x3c,0xe4,0x43,0x3b,0x88,
+    0xc3,0x3b,0xb0,0xc3,0x8c,0xc5,0x0a,0x87,0x79,0x98,0x87,0x77,0x18,0x87,0x74,0x08,
+    0x07,0x7a,0x28,0x07,0x72,0x98,0x81,0x5c,0xe3,0x10,0x0e,0xec,0xc0,0x0e,0xe5,0x50,
+    0x0e,0xf3,0x30,0x23,0xc1,0xd2,0x41,0x1e,0xe4,0xe1,0x17,0xd8,0xe1,0x1d,0xde,0x01,
+    0x1e,0x66,0x50,0x59,0x38,0xa4,0x83,0x3c,0xb8,0x81,0x39,0xd4,0x83,0x3b,0x8c,0x03,
+    0x3d,0xa4,0xc3,0x3b,0xb8,0xc3,0x2f,0x9c,0x83,0x3c,0xbc,0x43,0x3d,0xc0,0xc3,0x3c,
+    0x00,0x71,0x20,0x00,0x00,0x0b,0x00,0x00,0x00,0x26,0xb0,0x01,0x48,0xe4,0x4b,0x00,
+    0xf3,0x2c,0xc4,0x3f,0x11,0xd7,0x44,0x45,0xc4,0x6f,0x0f,0x7e,0x85,0x17,0xb7,0x6d,
+    0x00,0x05,0x03,0x20,0x0d,0x6d,0x01,0x0d,0x80,0x44,0x3e,0x83,0x5c,0x7e,0x85,0x17,
+    0xb7,0x0d,0x00,0x00,0x00,0x61,0x20,0x00,0x00,0x25,0x00,0x00,0x00,0x13,0x04,0x41,
+    0x2c,0x10,0x00,0x00,0x00,0x0c,0x00,0x00,0x00,0x74,0x47,0x00,0xc6,0x22,0x80,0x40,
+    0x38,0xe6,0x20,0x06,0xc2,0xa8,0xc8,0xd5,0xc0,0x08,0x00,0xbd,0x19,0x00,0x82,0x23,
+    0x00,0x54,0xc7,0x1a,0x80,0x40,0x18,0x6b,0x18,0x86,0x81,0xec,0x0c,0x00,0x89,0x19,
+    0x00,0x0a,0x33,0x00,0x04,0x46,0x00,0x00,0x00,0x23,0x06,0xca,0x10,0x6c,0x8f,0x23,
+    0x29,0x47,0x12,0x58,0x20,0xc9,0x67,0x90,0x21,0x20,0x90,0x41,0x06,0xa1,0x40,0x4c,
+    0x08,0xe4,0x33,0xc8,0x10,0x24,0xd0,0x20,0x43,0x50,0x48,0x16,0x60,0xf2,0x19,0x6f,
+    0xc0,0x38,0x31,0xa0,0x60,0xcc,0x31,0x30,0x01,0x19,0x0c,0x32,0x04,0x0d,0x36,0x62,
+    0x60,0x08,0x01,0x1a,0x2c,0x45,0x30,0xdb,0x00,0x05,0x40,0x06,0x01,0x31,0x00,0x00,
+    0x00,0x02,0x00,0x00,0x00,0x5b,0x86,0x24,0xf8,0x03,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+};
+static const uint8_t _sspine_vs_bytecode_metal_ios[3068] = {
+    0x4d,0x54,0x4c,0x42,0x01,0x00,0x02,0x00,0x02,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0xfc,0x0b,0x00,0x00,0x00,0x00,0x00,0x00,0x58,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x6d,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xc9,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x3b,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x04,0x01,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x08,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x0c,0x01,0x00,0x00,0x00,0x00,0x00,0x00,
+    0xf0,0x0a,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x6d,0x00,0x00,0x00,
+    0x4e,0x41,0x4d,0x45,0x06,0x00,0x6d,0x61,0x69,0x6e,0x30,0x00,0x54,0x59,0x50,0x45,
+    0x01,0x00,0x00,0x48,0x41,0x53,0x48,0x20,0x00,0x96,0x65,0x31,0x3a,0xaa,0x1f,0x1f,
+    0x56,0xb5,0xb0,0x40,0x9b,0xfd,0xd1,0x68,0xc7,0x7d,0x4c,0x0f,0x15,0x45,0xbb,0x02,
+    0x8a,0x0a,0x18,0xa7,0xf2,0xf6,0x03,0x3e,0x76,0x4f,0x46,0x46,0x54,0x18,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x56,0x45,0x52,0x53,0x08,0x00,0x01,0x00,0x08,
+    0x00,0x01,0x00,0x00,0x00,0x45,0x4e,0x44,0x54,0x37,0x00,0x00,0x00,0x56,0x41,0x54,
+    0x54,0x22,0x00,0x03,0x00,0x70,0x6f,0x73,0x69,0x74,0x69,0x6f,0x6e,0x00,0x00,0x80,
+    0x74,0x65,0x78,0x63,0x6f,0x6f,0x72,0x64,0x30,0x00,0x01,0x80,0x63,0x6f,0x6c,0x6f,
+    0x72,0x30,0x00,0x02,0x80,0x56,0x41,0x54,0x59,0x05,0x00,0x03,0x00,0x04,0x04,0x06,
+    0x45,0x4e,0x44,0x54,0x04,0x00,0x00,0x00,0x45,0x4e,0x44,0x54,0xde,0xc0,0x17,0x0b,
+    0x00,0x00,0x00,0x00,0x14,0x00,0x00,0x00,0xd8,0x0a,0x00,0x00,0xff,0xff,0xff,0xff,
+    0x42,0x43,0xc0,0xde,0x21,0x0c,0x00,0x00,0xb3,0x02,0x00,0x00,0x0b,0x82,0x20,0x00,
+    0x02,0x00,0x00,0x00,0x12,0x00,0x00,0x00,0x07,0x81,0x23,0x91,0x41,0xc8,0x04,0x49,
+    0x06,0x10,0x32,0x39,0x92,0x01,0x84,0x0c,0x25,0x05,0x08,0x19,0x1e,0x04,0x8b,0x62,
+    0x80,0x14,0x45,0x02,0x42,0x92,0x0b,0x42,0xa4,0x10,0x32,0x14,0x38,0x08,0x18,0x49,
+    0x0a,0x32,0x44,0x24,0x48,0x0a,0x90,0x21,0x23,0xc4,0x52,0x80,0x0c,0x19,0x21,0x72,
+    0x24,0x07,0xc8,0x48,0x11,0x62,0xa8,0xa0,0xa8,0x40,0xc6,0xf0,0x01,0x00,0x00,0x00,
+    0x51,0x18,0x00,0x00,0x82,0x00,0x00,0x00,0x1b,0xc8,0x25,0xf8,0xff,0xff,0xff,0xff,
+    0x01,0x90,0x80,0x8a,0x18,0x87,0x77,0x90,0x07,0x79,0x28,0x87,0x71,0xa0,0x07,0x76,
+    0xc8,0x87,0x36,0x90,0x87,0x77,0xa8,0x07,0x77,0x20,0x87,0x72,0x20,0x87,0x36,0x20,
+    0x87,0x74,0xb0,0x87,0x74,0x20,0x87,0x72,0x68,0x83,0x79,0x88,0x07,0x79,0xa0,0x87,
+    0x36,0x30,0x07,0x78,0x68,0x83,0x76,0x08,0x07,0x7a,0x40,0x07,0xc0,0x1c,0xc2,0x81,
+    0x1d,0xe6,0xa1,0x1c,0x00,0x82,0x1c,0xd2,0x61,0x1e,0xc2,0x41,0x1c,0xd8,0xa1,0x1c,
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+    0x03,0x73,0x60,0x87,0x70,0x38,0x87,0x79,0x98,0x22,0x04,0xc3,0x08,0x85,0x1d,0xd8,
+    0xc1,0x1e,0xda,0xc1,0x0d,0xd2,0x81,0x1c,0xca,0xc1,0x1d,0xe8,0x61,0x4a,0x50,0x8c,
+    0x58,0xc2,0x21,0x1d,0xe4,0xc1,0x0d,0xec,0xa1,0x1c,0xe4,0x61,0x1e,0xd2,0xe1,0x1d,
+    0xdc,0x61,0x4a,0x60,0x8c,0xa0,0xc2,0x21,0x1d,0xe4,0xc1,0x0d,0xd8,0x21,0x1c,0xdc,
+    0xe1,0x1c,0xea,0x21,0x1c,0xce,0xa1,0x1c,0x7e,0xc1,0x1e,0xca,0x41,0x1e,0xe6,0x21,
+    0x1d,0xde,0xc1,0x1d,0xa6,0x04,0xc8,0x88,0x29,0x1c,0xd2,0x41,0x1e,0xdc,0x60,0x1c,
+    0xde,0xa1,0x1d,0xe0,0x21,0x1d,0xd8,0xa1,0x1c,0x7e,0xe1,0x1d,0xe0,0x81,0x1e,0xd2,
+    0xe1,0x1d,0xdc,0x61,0x1e,0xa6,0x0c,0x0a,0xe3,0x8c,0x50,0xc2,0x21,0x1d,0xe4,0xc1,
+    0x0d,0xec,0xa1,0x1c,0xe4,0x81,0x1e,0xca,0x01,0x1f,0xa6,0x04,0x74,0x00,0x00,0x00,
+    0x79,0x18,0x00,0x00,0x7b,0x00,0x00,0x00,0x33,0x08,0x80,0x1c,0xc4,0xe1,0x1c,0x66,
+    0x14,0x01,0x3d,0x88,0x43,0x38,0x84,0xc3,0x8c,0x42,0x80,0x07,0x79,0x78,0x07,0x73,
+    0x98,0x71,0x0c,0xe6,0x00,0x0f,0xed,0x10,0x0e,0xf4,0x80,0x0e,0x33,0x0c,0x42,0x1e,
+    0xc2,0xc1,0x1d,0xce,0xa1,0x1c,0x66,0x30,0x05,0x3d,0x88,0x43,0x38,0x84,0x83,0x1b,
+    0xcc,0x03,0x3d,0xc8,0x43,0x3d,0x8c,0x03,0x3d,0xcc,0x78,0x8c,0x74,0x70,0x07,0x7b,
+    0x08,0x07,0x79,0x48,0x87,0x70,0x70,0x07,0x7a,0x70,0x03,0x76,0x78,0x87,0x70,0x20,
+    0x87,0x19,0xcc,0x11,0x0e,0xec,0x90,0x0e,0xe1,0x30,0x0f,0x6e,0x30,0x0f,0xe3,0xf0,
+    0x0e,0xf0,0x50,0x0e,0x33,0x10,0xc4,0x1d,0xde,0x21,0x1c,0xd8,0x21,0x1d,0xc2,0x61,
+    0x1e,0x66,0x30,0x89,0x3b,0xbc,0x83,0x3b,0xd0,0x43,0x39,0xb4,0x03,0x3c,0xbc,0x83,
+    0x3c,0x84,0x03,0x3b,0xcc,0xf0,0x14,0x76,0x60,0x07,0x7b,0x68,0x07,0x37,0x68,0x87,
+    0x72,0x68,0x07,0x37,0x80,0x87,0x70,0x90,0x87,0x70,0x60,0x07,0x76,0x28,0x07,0x76,
+    0xf8,0x05,0x76,0x78,0x87,0x77,0x80,0x87,0x5f,0x08,0x87,0x71,0x18,0x87,0x72,0x98,
+    0x87,0x79,0x98,0x81,0x2c,0xee,0xf0,0x0e,0xee,0xe0,0x0e,0xf5,0xc0,0x0e,0xec,0x30,
+    0x03,0x62,0xc8,0xa1,0x1c,0xe4,0xa1,0x1c,0xcc,0xa1,0x1c,0xe4,0xa1,0x1c,0xdc,0x61,
+    0x1c,0xca,0x21,0x1c,0xc4,0x81,0x1d,0xca,0x61,0x06,0xd6,0x90,0x43,0x39,0xc8,0x43,
+    0x39,0x98,0x43,0x39,0xc8,0x43,0x39,0xb8,0xc3,0x38,0x94,0x43,0x38,0x88,0x03,0x3b,
+    0x94,0xc3,0x2f,0xbc,0x83,0x3c,0xfc,0x82,0x3b,0xd4,0x03,0x3b,0xb0,0xc3,0x0c,0xc7,
+    0x69,0x87,0x70,0x58,0x87,0x72,0x70,0x83,0x74,0x68,0x07,0x78,0x60,0x87,0x74,0x18,
+    0x87,0x74,0xa0,0x87,0x19,0xce,0x53,0x0f,0xee,0x00,0x0f,0xf2,0x50,0x0e,0xe4,0x90,
+    0x0e,0xe3,0x40,0x0f,0xe1,0x20,0x0e,0xec,0x50,0x0e,0x33,0x20,0x28,0x1d,0xdc,0xc1,
+    0x1e,0xc2,0x41,0x1e,0xd2,0x21,0x1c,0xdc,0x81,0x1e,0xdc,0xe0,0x1c,0xe4,0xe1,0x1d,
+    0xea,0x01,0x1e,0x66,0x18,0x51,0x38,0xb0,0x43,0x3a,0x9c,0x83,0x3b,0xcc,0x50,0x24,
+    0x76,0x60,0x07,0x7b,0x68,0x07,0x37,0x60,0x87,0x77,0x78,0x07,0x78,0x98,0x51,0x4c,
+    0xf4,0x90,0x0f,0xf0,0x50,0x0e,0x33,0x1e,0x6a,0x1e,0xca,0x61,0x1c,0xe8,0x21,0x1d,
+    0xde,0xc1,0x1d,0x7e,0x01,0x1e,0xe4,0xa1,0x1c,0xcc,0x21,0x1d,0xf0,0x61,0x06,0x54,
+    0x85,0x83,0x38,0xcc,0xc3,0x3b,0xb0,0x43,0x3d,0xd0,0x43,0x39,0xfc,0xc2,0x3c,0xe4,
+    0x43,0x3b,0x88,0xc3,0x3b,0xb0,0xc3,0x8c,0xc5,0x0a,0x87,0x79,0x98,0x87,0x77,0x18,
+    0x87,0x74,0x08,0x07,0x7a,0x28,0x07,0x72,0x98,0x81,0x5c,0xe3,0x10,0x0e,0xec,0xc0,
+    0x0e,0xe5,0x50,0x0e,0xf3,0x30,0x23,0xc1,0xd2,0x41,0x1e,0xe4,0xe1,0x17,0xd8,0xe1,
+    0x1d,0xde,0x01,0x1e,0x66,0x50,0x59,0x38,0xa4,0x83,0x3c,0xb8,0x81,0x39,0xd4,0x83,
+    0x3b,0x8c,0x03,0x3d,0xa4,0xc3,0x3b,0xb8,0xc3,0x2f,0x9c,0x83,0x3c,0xbc,0x43,0x3d,
+    0xc0,0xc3,0x3c,0x00,0x71,0x20,0x00,0x00,0x02,0x00,0x00,0x00,0x06,0x50,0x30,0x00,
+    0xd2,0xd0,0x00,0x00,0x61,0x20,0x00,0x00,0x1e,0x00,0x00,0x00,0x13,0x04,0x41,0x2c,
+    0x10,0x00,0x00,0x00,0x05,0x00,0x00,0x00,0xf4,0xc6,0x22,0x82,0x20,0x08,0x46,0x00,
+    0xa8,0x95,0x40,0x19,0xd0,0x98,0x01,0xa0,0x30,0x03,0x00,0x00,0xe3,0x15,0x07,0x33,
+    0x4d,0x0c,0x05,0x65,0x90,0x81,0x19,0x0e,0x13,0x02,0xf9,0x8c,0x57,0x2c,0xd0,0x75,
+    0x21,0x14,0x94,0x41,0x06,0xe8,0x60,0x4c,0x08,0xe4,0x63,0x41,0x01,0x9f,0xf1,0x0a,
+    0xa8,0xe2,0x38,0x86,0x82,0x62,0x43,0x00,0x9f,0xd9,0x06,0xa7,0x02,0x66,0x1b,0x82,
+    0x2a,0x98,0x6d,0x08,0x06,0x21,0x83,0x80,0x18,0x00,0x00,0x00,0x04,0x00,0x00,0x00,
+    0x5b,0x86,0x20,0xc8,0x83,0x2d,0x43,0x11,0xe4,0xc1,0x96,0x41,0x09,0xf2,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+};
+static const uint8_t _sspine_fs_bytecode_metal_ios[3257] = {
+    0x4d,0x54,0x4c,0x42,0x01,0x00,0x02,0x00,0x02,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0xb9,0x0c,0x00,0x00,0x00,0x00,0x00,0x00,0x58,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x6d,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xc9,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x08,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xd1,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x08,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xd9,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0xe0,0x0b,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x6d,0x00,0x00,0x00,
+    0x4e,0x41,0x4d,0x45,0x06,0x00,0x6d,0x61,0x69,0x6e,0x30,0x00,0x54,0x59,0x50,0x45,
+    0x01,0x00,0x01,0x48,0x41,0x53,0x48,0x20,0x00,0xd9,0xfc,0xdf,0x3c,0xd7,0xa7,0xa7,
+    0x8d,0xdf,0x35,0x03,0xca,0x84,0xdd,0x0c,0x35,0xa5,0xf8,0x0e,0x6e,0x0d,0x77,0x9a,
+    0x47,0x0e,0xe1,0x20,0xf6,0x87,0xac,0x7a,0x9e,0x4f,0x46,0x46,0x54,0x18,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x56,0x45,0x52,0x53,0x08,0x00,0x01,0x00,0x08,
+    0x00,0x01,0x00,0x00,0x00,0x45,0x4e,0x44,0x54,0x04,0x00,0x00,0x00,0x45,0x4e,0x44,
+    0x54,0x04,0x00,0x00,0x00,0x45,0x4e,0x44,0x54,0xde,0xc0,0x17,0x0b,0x00,0x00,0x00,
+    0x00,0x14,0x00,0x00,0x00,0xc0,0x0b,0x00,0x00,0xff,0xff,0xff,0xff,0x42,0x43,0xc0,
+    0xde,0x21,0x0c,0x00,0x00,0xed,0x02,0x00,0x00,0x0b,0x82,0x20,0x00,0x02,0x00,0x00,
+    0x00,0x12,0x00,0x00,0x00,0x07,0x81,0x23,0x91,0x41,0xc8,0x04,0x49,0x06,0x10,0x32,
+    0x39,0x92,0x01,0x84,0x0c,0x25,0x05,0x08,0x19,0x1e,0x04,0x8b,0x62,0x80,0x14,0x45,
+    0x02,0x42,0x92,0x0b,0x42,0xa4,0x10,0x32,0x14,0x38,0x08,0x18,0x49,0x0a,0x32,0x44,
+    0x24,0x48,0x0a,0x90,0x21,0x23,0xc4,0x52,0x80,0x0c,0x19,0x21,0x72,0x24,0x07,0xc8,
+    0x48,0x11,0x62,0xa8,0xa0,0xa8,0x40,0xc6,0xf0,0x01,0x00,0x00,0x00,0x51,0x18,0x00,
+    0x00,0x8e,0x00,0x00,0x00,0x1b,0xcc,0x25,0xf8,0xff,0xff,0xff,0xff,0x01,0x60,0x00,
+    0x09,0xa8,0x88,0x71,0x78,0x07,0x79,0x90,0x87,0x72,0x18,0x07,0x7a,0x60,0x87,0x7c,
+    0x68,0x03,0x79,0x78,0x87,0x7a,0x70,0x07,0x72,0x28,0x07,0x72,0x68,0x03,0x72,0x48,
+    0x07,0x7b,0x48,0x07,0x72,0x28,0x87,0x36,0x98,0x87,0x78,0x90,0x07,0x7a,0x68,0x03,
+    0x73,0x80,0x87,0x36,0x68,0x87,0x70,0xa0,0x07,0x74,0x00,0xcc,0x21,0x1c,0xd8,0x61,
+    0x1e,0xca,0x01,0x20,0xc8,0x21,0x1d,0xe6,0x21,0x1c,0xc4,0x81,0x1d,0xca,0xa1,0x0d,
+    0xe8,0x21,0x1c,0xd2,0x81,0x1d,0xda,0x60,0x1c,0xc2,0x81,0x1d,0xd8,0x61,0x1e,0x00,
+    0x73,0x08,0x07,0x76,0x98,0x87,0x72,0x00,0x08,0x76,0x28,0x87,0x79,0x98,0x87,0x36,
+    0x80,0x07,0x79,0x28,0x87,0x71,0x48,0x87,0x79,0x28,0x87,0x36,0x30,0x07,0x78,0x68,
+    0x87,0x70,0x20,0x07,0xc0,0x1c,0xc2,0x81,0x1d,0xe6,0xa1,0x1c,0x00,0xc2,0x1d,0xde,
+    0xa1,0x0d,0xcc,0x41,0x1e,0xc2,0xa1,0x1d,0xca,0xa1,0x0d,0xe0,0xe1,0x1d,0xd2,0xc1,
+    0x1d,0xe8,0xa1,0x1c,0xe4,0xa1,0x0d,0xca,0x81,0x1d,0xd2,0xa1,0x1d,0x00,0x7a,0x90,
+    0x87,0x7a,0x28,0x07,0x60,0x70,0x87,0x77,0x68,0x03,0x73,0x90,0x87,0x70,0x68,0x87,
+    0x72,0x68,0x03,0x78,0x78,0x87,0x74,0x70,0x07,0x7a,0x28,0x07,0x79,0x68,0x83,0x72,
+    0x60,0x87,0x74,0x68,0x87,0x36,0x70,0x87,0x77,0x70,0x87,0x36,0x60,0x87,0x72,0x08,
+    0x07,0x73,0x00,0x08,0x77,0x78,0x87,0x36,0x48,0x07,0x77,0x30,0x87,0x79,0x68,0x03,
+    0x73,0x80,0x87,0x36,0x68,0x87,0x70,0xa0,0x07,0x74,0x00,0xe8,0x41,0x1e,0xea,0xa1,
+    0x1c,0x00,0xc2,0x1d,0xde,0xa1,0x0d,0xd4,0xa1,0x1e,0xda,0x01,0x1e,0xda,0x80,0x1e,
+    0xc2,0x41,0x1c,0xd8,0xa1,0x1c,0xe6,0x01,0x30,0x87,0x70,0x60,0x87,0x79,0x28,0x07,
+    0x80,0x70,0x87,0x77,0x68,0x03,0x77,0x08,0x07,0x77,0x98,0x87,0x36,0x30,0x07,0x78,
+    0x68,0x83,0x76,0x08,0x07,0x7a,0x40,0x07,0x80,0x1e,0xe4,0xa1,0x1e,0xca,0x01,0x20,
+    0xdc,0xe1,0x1d,0xda,0x60,0x1e,0xd2,0xe1,0x1c,0xdc,0xa1,0x1c,0xc8,0xa1,0x0d,0xf4,
+    0xa1,0x1c,0xe4,0xe1,0x1d,0xe6,0xa1,0x0d,0xcc,0x01,0x1e,0xda,0xa0,0x1d,0xc2,0x81,
+    0x1e,0xd0,0x01,0xa0,0x07,0x79,0xa8,0x87,0x72,0x00,0x08,0x77,0x78,0x87,0x36,0xa0,
+    0x07,0x79,0x08,0x07,0x78,0x80,0x87,0x74,0x70,0x87,0x73,0x68,0x83,0x76,0x08,0x07,
+    0x7a,0x40,0x07,0x80,0x1e,0xe4,0xa1,0x1e,0xca,0x01,0x20,0xe6,0x81,0x1e,0xc2,0x61,
+    0x1c,0xd6,0xa1,0x0d,0xe0,0x41,0x1e,0xde,0x81,0x1e,0xca,0x61,0x1c,0xe8,0xe1,0x1d,
+    0xe4,0xa1,0x0d,0xc4,0xa1,0x1e,0xcc,0xc1,0x1c,0xca,0x41,0x1e,0xda,0x60,0x1e,0xd2,
+    0x41,0x1f,0xca,0x01,0xc0,0x03,0x80,0xa8,0x07,0x77,0x98,0x87,0x70,0x30,0x87,0x72,
+    0x68,0x03,0x73,0x80,0x87,0x36,0x68,0x87,0x70,0xa0,0x07,0x74,0x00,0xe8,0x41,0x1e,
+    0xea,0xa1,0x1c,0x00,0xa2,0x1e,0xe6,0xa1,0x1c,0xda,0x60,0x1e,0xde,0xc1,0x1c,0xe8,
+    0xa1,0x0d,0xcc,0x81,0x1d,0xde,0x21,0x1c,0xe8,0x01,0x30,0x87,0x70,0x60,0x87,0x79,
+    0x28,0x07,0x60,0x03,0x22,0x0c,0x40,0x02,0x2c,0x40,0xb5,0xc1,0x18,0x08,0x60,0x01,
+    0xaa,0x0d,0x06,0x51,0x00,0x0b,0x50,0x6d,0x30,0x8a,0xff,0xff,0xff,0xff,0x1f,0x00,
+    0x09,0xa0,0x36,0x20,0xc6,0xff,0xff,0xff,0xff,0x0f,0x00,0x03,0x48,0x40,0xb5,0xc1,
+    0x38,0x02,0x60,0x01,0xaa,0x0d,0x06,0x22,0x00,0x0b,0x50,0x01,0x00,0x49,0x18,0x00,
+    0x00,0x03,0x00,0x00,0x00,0x13,0x88,0x40,0x18,0x88,0x09,0x41,0x31,0x61,0x30,0x0e,
+    0x04,0x89,0x20,0x00,0x00,0x27,0x00,0x00,0x00,0x32,0x22,0x48,0x09,0x20,0x64,0x85,
+    0x04,0x93,0x22,0xa4,0x84,0x04,0x93,0x22,0xe3,0x84,0xa1,0x90,0x14,0x12,0x4c,0x8a,
+    0x8c,0x0b,0x84,0xa4,0x4c,0x10,0x6c,0x33,0x00,0xc3,0x08,0x04,0x60,0x83,0x30,0x8c,
+    0x20,0x00,0x07,0x49,0x53,0x44,0x09,0x93,0x5f,0x48,0xff,0x03,0x44,0x00,0x23,0xa1,
+    0x00,0x0c,0x22,0x10,0xc2,0x51,0xd2,0x14,0x51,0xc2,0xe4,0xff,0x13,0x71,0x4d,0x54,
+    0x44,0xfc,0xf6,0xf0,0x4f,0x63,0x04,0xc0,0x20,0x82,0x11,0x5c,0x24,0x4d,0x11,0x25,
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+static const char _sspine_vs_source_metal_sim[716] = {
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+static const char _sspine_fs_source_metal_sim[721] = {
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+    0x74,0x20,0x5f,0x33,0x34,0x20,0x3d,0x20,0x5f,0x32,0x35,0x2e,0x77,0x3b,0x0a,0x23,
+    0x6c,0x69,0x6e,0x65,0x20,0x31,0x36,0x20,0x22,0x73,0x73,0x70,0x69,0x6e,0x65,0x2e,
+    0x67,0x6c,0x73,0x6c,0x22,0x0a,0x20,0x20,0x20,0x20,0x6f,0x75,0x74,0x2e,0x66,0x72,
+    0x61,0x67,0x5f,0x63,0x6f,0x6c,0x6f,0x72,0x20,0x3d,0x20,0x6d,0x69,0x78,0x28,0x5f,
+    0x32,0x35,0x2c,0x20,0x66,0x6c,0x6f,0x61,0x74,0x34,0x28,0x5f,0x32,0x35,0x2e,0x78,
+    0x79,0x7a,0x20,0x2a,0x20,0x5f,0x33,0x34,0x2c,0x20,0x5f,0x33,0x34,0x29,0x20,0x2a,
+    0x20,0x69,0x6e,0x2e,0x63,0x6f,0x6c,0x6f,0x72,0x2c,0x20,0x66,0x6c,0x6f,0x61,0x74,
+    0x34,0x28,0x5f,0x35,0x30,0x2e,0x70,0x6d,0x61,0x29,0x29,0x3b,0x0a,0x20,0x20,0x20,
+    0x20,0x72,0x65,0x74,0x75,0x72,0x6e,0x20,0x6f,0x75,0x74,0x3b,0x0a,0x7d,0x0a,0x0a,
+    0x00,
+};
+#elif defined(SOKOL_WGPU)
+FIXME
+#elif defined(SOKOL_DUMMY_BACKEND)
+static const char* _sspine_vs_source_dummy = "";
+static const char* _sspine_fs_source_dummy = "";
+#else
+#error "Please define one of SOKOL_GLCORE33, SOKOL_GLES2, SOKOL_GLES3, SOKOL_D3D11, SOKOL_METAL, SOKOL_WGPU or SOKOL_DUMMY_BACKEND!"
+#endif
+
+#define _sspine_def(val, def) (((val) == 0) ? (def) : (val))
+#define _SSPINE_INIT_COOKIE (0xABBAABBA)
+#define _SSPINE_INVALID_SLOT_INDEX (0)
+#define _SSPINE_DEFAULT_CONTEXT_POOL_SIZE (4)
+#define _SSPINE_DEFAULT_ATLAS_POOL_SIZE (64)
+#define _SSPINE_DEFAULT_SKELETON_POOL_SIZE (64)
+#define _SSPINE_DEFAULT_SKINSET_POOL_SIZE (64)
+#define _SSPINE_DEFAULT_INSTANCE_POOL_SIZE (1024)
+#define _SSPINE_DEFAULT_MAX_VERTICES (1<<16)
+#define _SSPINE_DEFAULT_MAX_COMMANDS (1<<14)
+#define _SSPINE_MAX_TRIGGERED_EVENTS (16)
+#define _SSPINE_SLOT_SHIFT (16)
+#define _SSPINE_MAX_POOL_SIZE (1<<_SSPINE_SLOT_SHIFT)
+#define _SSPINE_SLOT_MASK (_SSPINE_MAX_POOL_SIZE-1)
+
+#if defined(SOKOL_DEBUG)
+#define _SSPINE_XMACRO(code) #code,
+static const char* _sspine_error_ids[] = {
+    _SSPINE_ERRORS
+};
+#undef _SSPINE_XMACRO
+#endif // SOKOL_DEBUG
+
+typedef struct {
+    float mvp[16];
+} _sspine_vsparams_t;
+
+typedef struct {
+    float pma;
+    uint8_t _pad[12];
+} _sspine_fsparams_t;
+
+typedef struct {
+    uint32_t id;
+    sspine_resource_state state;
+} _sspine_slot_t;
+
+typedef struct {
+    int size;
+    int queue_top;
+    uint32_t* gen_ctrs;
+    int* free_queue;
+} _sspine_pool_t;
+
+typedef struct {
+    _sspine_slot_t slot;
+    sspine_atlas_overrides overrides;
+    spAtlas* sp_atlas;
+    int num_pages;
+} _sspine_atlas_t;
+
+typedef struct {
+    _sspine_pool_t pool;
+    _sspine_atlas_t* items;
+} _sspine_atlas_pool_t;
+
+typedef struct {
+    uint32_t id;
+    _sspine_atlas_t* ptr;
+} _sspine_atlas_ref_t;
+
+typedef struct {
+    _sspine_slot_t slot;
+    _sspine_atlas_ref_t atlas;
+    spSkeletonData* sp_skel_data;
+    spAnimationStateData* sp_anim_data;
+    struct {
+        int num;
+        sspine_vec2* ptr;
+    } tform_buf;
+} _sspine_skeleton_t;
+
+typedef struct {
+    _sspine_pool_t pool;
+    _sspine_skeleton_t* items;
+} _sspine_skeleton_pool_t;
+
+typedef struct {
+    uint32_t id;
+    _sspine_skeleton_t* ptr;
+} _sspine_skeleton_ref_t;
+
+typedef struct {
+    _sspine_slot_t slot;
+    _sspine_skeleton_ref_t skel;
+    spSkin* sp_skin;
+} _sspine_skinset_t;
+
+typedef struct {
+    _sspine_pool_t pool;
+    _sspine_skinset_t* items;
+} _sspine_skinset_pool_t;
+
+typedef struct {
+    uint32_t id;
+    _sspine_skinset_t* ptr;
+} _sspine_skinset_ref_t;
+
+typedef struct {
+    _sspine_slot_t slot;
+    _sspine_atlas_ref_t atlas;
+    _sspine_skeleton_ref_t skel;
+    _sspine_skinset_ref_t skinset;
+    spSkeleton* sp_skel;
+    spAnimationState* sp_anim_state;
+    spSkeletonClipping* sp_clip;
+    int cur_triggered_event_index;
+    sspine_triggered_event_info triggered_events[_SSPINE_MAX_TRIGGERED_EVENTS];
+} _sspine_instance_t;
+
+typedef struct {
+    _sspine_pool_t pool;
+    _sspine_instance_t* items;
+} _sspine_instance_pool_t;
+
+typedef struct {
+    sspine_vec2 pos;
+    sspine_vec2 uv;
+    uint32_t color;
+} _sspine_vertex_t;
+
+typedef struct {
+    _sspine_vertex_t* ptr;
+    int index;
+} _sspine_alloc_vertices_result_t;
+
+typedef struct {
+    uint32_t* ptr;
+    int index;
+} _sspine_alloc_indices_result_t;
+
+typedef struct {
+    int layer;
+    sg_pipeline pip;
+    sg_image img;
+    float pma; // pma = 0.0: use texture color as is, pma = 1.0: multiply texture rgb by texture alpha in fragment shader
+    int base_element;
+    int num_elements;
+} _sspine_command_t;
+
+typedef struct {
+    _sspine_slot_t slot;
+    float transform[16];
+    struct {
+        int num;
+        int cur;
+        uint32_t rewind_frame_count;
+        _sspine_vertex_t* ptr;
+    } vertices;
+    struct {
+        int num;
+        int cur;
+        uint32_t rewind_frame_count;
+        uint32_t* ptr;
+    } indices;
+    struct {
+        int num;
+        int cur;
+        uint32_t rewind_frame_count;
+        _sspine_command_t* ptr;
+    } commands;
+    uint32_t update_frame_count;
+    sg_buffer vbuf;
+    sg_buffer ibuf;
+    struct {
+        sg_pipeline normal_additive;
+        sg_pipeline multiply;
+    } pip;
+    sg_bindings bind;
+} _sspine_context_t;
+
+typedef struct {
+    _sspine_pool_t pool;
+    _sspine_context_t* items;
+} _sspine_context_pool_t;
+
+typedef struct {
+    uint32_t init_cookie;
+    uint32_t frame_count;
+    sspine_desc desc;
+    sspine_context def_ctx_id;
+    sspine_context cur_ctx_id;
+    _sspine_context_t* cur_ctx;   // may be 0!
+    sg_shader shd;
+    _sspine_context_pool_t context_pool;
+    _sspine_atlas_pool_t atlas_pool;
+    _sspine_skeleton_pool_t skeleton_pool;
+    _sspine_skinset_pool_t skinset_pool;
+    _sspine_instance_pool_t instance_pool;
+} _sspine_t;
+static _sspine_t _sspine;
+
+// dummy spine-c platform implementation functions
+void _spAtlasPage_createTexture(spAtlasPage* self, const char* path) {
+    // nothing to do here
+    (void)self; (void)path;
+}
+
+char* _spUtil_readFile(const char* path, int* length) {
+    (void)path;
+    *length = 0;
+    return 0;
+}
+
+//=== HELPER FUNCTION ==========================================================
+#define _SSPINE_PANIC(code) _sspine_log(SSPINE_ERROR_ ##code, SSPINE_LOGLEVEL_PANIC, __LINE__)
+#define _SSPINE_ERROR(code) _sspine_log(SSPINE_ERROR_ ##code, SSPINE_LOGLEVEL_ERROR, __LINE__)
+#define _SSPINE_WARN(code) _sspine_log(SSPINE_ERROR_ ##code, SSPINE_LOGLEVEL_WARN, __LINE__)
+#define _SSPINE_INFO(code) _sspine_log(SSPINE_ERROR_ ##code, SSPINE_LOGLEVEL_INFO, __LINE__)
+
+static void _sspine_log(sspine_error error_code, sspine_loglevel log_level, int line_nr) {
+    if (_sspine.desc.logger.func) {
+        #if defined(SOKOL_DEBUG)
+            const char* filename = __FILE__;
+            const char* error_id = _sspine_error_ids[error_code];
+        #else
+            const char* filename = "";
+            const char* error_id = "";
+        #endif
+        _sspine.desc.logger.func("sspine", log_level, error_code, error_id, line_nr, filename, _sspine.desc.logger.user_data);
+    }
+    else {
+        // default logging function, uses printf only if debugging is enabled to save executable size
+        const char* loglevel_str;
+        switch (log_level) {
+            case SSPINE_LOGLEVEL_PANIC: loglevel_str = "panic"; break;
+            case SSPINE_LOGLEVEL_ERROR: loglevel_str = "error"; break;
+            case SSPINE_LOGLEVEL_WARN:  loglevel_str = "warning"; break;
+            default: loglevel_str = "info"; break;
+        }
+        #if defined(SOKOL_DEBUG)
+        const char* error_id = _sspine_error_ids[error_code];
+        #if defined(_MSC_VER)
+            // Visual Studio compiler error format
+            fprintf(stderr, "[sspine] %s(%d): %s: %s\n", __FILE__, line_nr, loglevel_str, error_id);
+        #else
+            // GCC error format
+            fprintf(stderr, "[sspine] %s:%d:0: %s: %s\n", __FILE__, line_nr, loglevel_str, error_id);
+        #endif
+        #else
+            fputs("[sspine] ", stderr);
+            fputs(loglevel_str, stderr);
+            fputs(" (build in debug mode for more info)\n", stderr);
+        #endif // SOKOL_DEBUG
+
+        // for log level PANIC it would be 'undefined behaviour' to continue
+        if (log_level == SSPINE_LOGLEVEL_PANIC) {
+            abort();
+        }
+    }
+}
+
+static void _sspine_clear(void* ptr, size_t size) {
+    SOKOL_ASSERT(ptr && (size > 0));
+    memset(ptr, 0, size);
+}
+
+/* Copy a string into a fixed size buffer with guaranteed zero-
+   termination.
+
+   Return false if the string didn't fit into the buffer and had to be clamped.
+
+   FIXME: Currently UTF-8 strings might become invalid if the string
+   is clamped, because the last zero-byte might be written into
+   the middle of a multi-byte sequence.
+*/
+static bool _sspine_strcpy(const char* src, char* dst, int max_len) {
+    SOKOL_ASSERT(src && dst && (max_len > 0));
+    char* const end = &(dst[max_len-1]);
+    char c = 0;
+    for (int i = 0; i < max_len; i++) {
+        c = *src;
+        if (c != 0) {
+            src++;
+        }
+        *dst++ = c;
+    }
+    // truncated?
+    if (c != 0) {
+        *end = 0;
+        return false;
+    }
+    else {
+        return true;
+    }
+}
+
+static sspine_string _sspine_string(const char* cstr) {
+    sspine_string res;
+    _sspine_clear(&res, sizeof(res));
+    if (cstr) {
+        res.valid = true;
+        res.truncated = !_sspine_strcpy(cstr, res.cstr, sizeof(res.cstr));
+        res.len = (uint8_t)strlen(res.cstr);
+    }
+    return res;
+}
+
+static void* _sspine_malloc(size_t size) {
+    SOKOL_ASSERT(size > 0);
+    void* ptr;
+    if (_sspine.desc.allocator.alloc) {
+        ptr = _sspine.desc.allocator.alloc(size, _sspine.desc.allocator.user_data);
+    }
+    else {
+        ptr = malloc(size);
+    }
+    SOKOL_ASSERT(ptr);
+    return ptr;
+}
+
+static void* _sspine_malloc_clear(size_t size) {
+    void* ptr = _sspine_malloc(size);
+    _sspine_clear(ptr, size);
+    return ptr;
+}
+
+static void _sspine_free(void* ptr) {
+    if (_sspine.desc.allocator.free) {
+        _sspine.desc.allocator.free(ptr, _sspine.desc.allocator.user_data);
+    }
+    else {
+        free(ptr);
+    }
+}
+
+static bool _sspine_atlas_ref_valid(const _sspine_atlas_ref_t* ref) {
+    return ref->ptr && (ref->ptr->slot.id == ref->id);
+}
+
+static bool _sspine_skeleton_ref_valid(const _sspine_skeleton_ref_t* ref) {
+    return ref->ptr && (ref->ptr->slot.id == ref->id);
+}
+
+static bool _sspine_skinset_ref_valid(const _sspine_skinset_ref_t* ref) {
+    return ref->ptr && (ref->ptr->slot.id == ref->id);
+}
+
+static bool _sspine_skeleton_and_deps_valid(_sspine_skeleton_t* skeleton) {
+    return skeleton && _sspine_atlas_ref_valid(&skeleton->atlas);
+}
+
+static bool _sspine_skinset_and_deps_valid(_sspine_skinset_t* skinset) {
+    return skinset && _sspine_skeleton_ref_valid(&skinset->skel);
+}
+
+static bool _sspine_instance_and_deps_valid(_sspine_instance_t* instance) {
+    return instance &&
+        _sspine_atlas_ref_valid(&instance->atlas) &&
+        _sspine_skeleton_ref_valid(&instance->skel) &&
+        ((instance->skinset.id == SSPINE_INVALID_ID) || _sspine_skinset_ref_valid(&instance->skinset));
+}
+
+static sspine_image _sspine_image(uint32_t atlas_id, int index) {
+    sspine_image img = { atlas_id, index };
+    return img;
+}
+
+static sspine_atlas_page _sspine_atlas_page(uint32_t atlas_id, int index) {
+    sspine_atlas_page page = { atlas_id, index };
+    return page;
+}
+
+static sspine_anim _sspine_anim(uint32_t skeleton_id, int index) {
+    sspine_anim anim = { skeleton_id, index };
+    return anim;
+}
+
+static sspine_bone _sspine_bone(uint32_t skeleton_id, int index) {
+    sspine_bone bone = { skeleton_id, index };
+    return bone;
+}
+
+static sspine_slot _sspine_slot(uint32_t skeleton_id, int index) {
+    sspine_slot slot = { skeleton_id, index };
+    return slot;
+}
+
+static sspine_event _sspine_event(uint32_t skeleton_id, int index) {
+    sspine_event event = { skeleton_id, index };
+    return event;
+}
+
+static sspine_iktarget _sspine_iktarget(uint32_t skeleton_id, int index) {
+    sspine_iktarget iktarget = { skeleton_id, index };
+    return iktarget;
+}
+
+static sspine_skin _sspine_skin(uint32_t skeleton_id, int index) {
+    sspine_skin skin = { skeleton_id, index };
+    return skin;
+}
+
+//=== HANDLE POOL FUNCTIONS ====================================================
+static void _sspine_init_pool(_sspine_pool_t* pool, int num) {
+    SOKOL_ASSERT(pool && (num >= 1));
+    // slot 0 is reserved for the 'invalid id', so bump the pool size by 1
+    pool->size = num + 1;
+    pool->queue_top = 0;
+    // generation counters indexable by pool slot index, slot 0 is reserved
+    size_t gen_ctrs_size = sizeof(uint32_t) * (size_t)pool->size;
+    pool->gen_ctrs = (uint32_t*) _sspine_malloc_clear(gen_ctrs_size);
+    // it's not a bug to only reserve 'num' here
+    pool->free_queue = (int*) _sspine_malloc_clear(sizeof(int) * (size_t)num);
+    // never allocate the zero-th pool item since the invalid id is 0
+    for (int i = pool->size-1; i >= 1; i--) {
+        pool->free_queue[pool->queue_top++] = i;
+    }
+}
+
+static void _sspine_discard_pool(_sspine_pool_t* pool) {
+    SOKOL_ASSERT(pool);
+    SOKOL_ASSERT(pool->free_queue);
+    _sspine_free(pool->free_queue);
+    pool->free_queue = 0;
+    SOKOL_ASSERT(pool->gen_ctrs);
+    _sspine_free(pool->gen_ctrs);
+    pool->gen_ctrs = 0;
+    pool->size = 0;
+    pool->queue_top = 0;
+}
+
+static int _sspine_pool_alloc_index(_sspine_pool_t* pool) {
+    SOKOL_ASSERT(pool);
+    SOKOL_ASSERT(pool->free_queue);
+    if (pool->queue_top > 0) {
+        int slot_index = pool->free_queue[--pool->queue_top];
+        SOKOL_ASSERT((slot_index > 0) && (slot_index < pool->size));
+        return slot_index;
+    }
+    else {
+        // pool exhausted
+        return _SSPINE_INVALID_SLOT_INDEX;
+    }
+}
+
+static void _sspine_pool_free_index(_sspine_pool_t* pool, int slot_index) {
+    SOKOL_ASSERT((slot_index > _SSPINE_INVALID_SLOT_INDEX) && (slot_index < pool->size));
+    SOKOL_ASSERT(pool);
+    SOKOL_ASSERT(pool->free_queue);
+    SOKOL_ASSERT(pool->queue_top < pool->size);
+    #ifdef SOKOL_DEBUG
+    // debug check against double-free
+    for (int i = 0; i < pool->queue_top; i++) {
+        SOKOL_ASSERT(pool->free_queue[i] != slot_index);
+    }
+    #endif
+    pool->free_queue[pool->queue_top++] = slot_index;
+    SOKOL_ASSERT(pool->queue_top <= (pool->size-1));
+}
+
+/* initiailize a pool slot:
+    - bump the slot's generation counter
+    - create a resource id from the generation counter and slot index
+    - set the slot's id to this id
+    - set the slot's state to ALLOC
+    - return the handle id
+*/
+static uint32_t _sspine_slot_init(_sspine_pool_t* pool, _sspine_slot_t* slot, int slot_index) {
+    /* FIXME: add handling for an overflowing generation counter,
+       for now, just overflow (another option is to disable
+       the slot)
+    */
+    SOKOL_ASSERT(pool && pool->gen_ctrs);
+    SOKOL_ASSERT((slot_index > _SSPINE_INVALID_SLOT_INDEX) && (slot_index < pool->size));
+    SOKOL_ASSERT((slot->state == SSPINE_RESOURCESTATE_INITIAL) && (slot->id == SSPINE_INVALID_ID));
+    uint32_t ctr = ++pool->gen_ctrs[slot_index];
+    slot->id = (ctr<<_SSPINE_SLOT_SHIFT)|(slot_index & _SSPINE_SLOT_MASK);
+    slot->state = SSPINE_RESOURCESTATE_ALLOC;
+    return slot->id;
+}
+
+// extract slot index from id
+static int _sspine_slot_index(uint32_t id) {
+    int slot_index = (int) (id & _SSPINE_SLOT_MASK);
+    SOKOL_ASSERT(_SSPINE_INVALID_SLOT_INDEX != slot_index);
+    return slot_index;
+}
+
+static void _sspine_init_item_pool(_sspine_pool_t* pool, int pool_size, void** items_ptr, size_t item_size_bytes) {
+    // NOTE: the pools will have an additional item, since slot 0 is reserved
+    SOKOL_ASSERT(pool && (pool->size == 0));
+    SOKOL_ASSERT((pool_size > 0) && (pool_size < _SSPINE_MAX_POOL_SIZE));
+    SOKOL_ASSERT(items_ptr && (*items_ptr == 0));
+    SOKOL_ASSERT(item_size_bytes > 0);
+    _sspine_init_pool(pool, pool_size);
+    const size_t pool_size_bytes = item_size_bytes * (size_t)pool->size;
+    *items_ptr = _sspine_malloc_clear(pool_size_bytes);
+}
+
+static void _sspine_discard_item_pool(_sspine_pool_t* pool, void** items_ptr) {
+    SOKOL_ASSERT(pool && (pool->size != 0));
+    SOKOL_ASSERT(items_ptr && (*items_ptr != 0));
+    _sspine_free(*items_ptr); *items_ptr = 0;
+    _sspine_discard_pool(pool);
+}
+
+//== CONTEXT POOL FUNCTIONS ====================================================
+static void _sspine_setup_context_pool(int pool_size) {
+    _sspine_context_pool_t* p = &_sspine.context_pool;
+    _sspine_init_item_pool(&p->pool, pool_size, (void**)&p->items, sizeof(_sspine_context_t));
+}
+
+static void _sspine_discard_context_pool(void) {
+    _sspine_context_pool_t* p = &_sspine.context_pool;
+    _sspine_discard_item_pool(&p->pool, (void**)&p->items);
+}
+
+static sspine_context _sspine_make_context_handle(uint32_t id) {
+    sspine_context handle = { id };
+    return handle;
+}
+
+static _sspine_context_t* _sspine_context_at(uint32_t id) {
+    SOKOL_ASSERT(SSPINE_INVALID_ID != id);
+    const _sspine_context_pool_t* p = &_sspine.context_pool;
+    int slot_index = _sspine_slot_index(id);
+    SOKOL_ASSERT((slot_index > _SSPINE_INVALID_SLOT_INDEX) && (slot_index < p->pool.size));
+    return &p->items[slot_index];
+}
+
+static _sspine_context_t* _sspine_lookup_context(uint32_t id) {
+    if (SSPINE_INVALID_ID != id) {
+        _sspine_context_t* ctx = _sspine_context_at(id);
+        if (ctx->slot.id == id) {
+            return ctx;
+        }
+    }
+    return 0;
+}
+
+static sspine_context _sspine_alloc_context(void) {
+    _sspine_context_pool_t* p = &_sspine.context_pool;
+    int slot_index = _sspine_pool_alloc_index(&p->pool);
+    if (_SSPINE_INVALID_SLOT_INDEX != slot_index) {
+        uint32_t id = _sspine_slot_init(&p->pool, &p->items[slot_index].slot, slot_index);
+        return _sspine_make_context_handle(id);
+    }
+    else {
+        // pool exhausted
+        return _sspine_make_context_handle(SSPINE_INVALID_ID);
+    }
+}
+
+static sspine_resource_state _sspine_init_context(_sspine_context_t* ctx, const sspine_context_desc* desc) {
+    SOKOL_ASSERT(ctx && (ctx->slot.state == SSPINE_RESOURCESTATE_ALLOC));
+    SOKOL_ASSERT(desc);
+
+    // setup vertex, index and command storage
+    ctx->vertices.num = desc->max_vertices;
+    ctx->indices.num = ctx->vertices.num * 3;
+    ctx->commands.num = desc->max_commands;
+
+    const size_t vbuf_size = (size_t)ctx->vertices.num * sizeof(_sspine_vertex_t);
+    const size_t ibuf_size = (size_t)ctx->indices.num * sizeof(uint32_t);
+    const size_t cbuf_size = (size_t)ctx->commands.num * sizeof(_sspine_command_t);
+
+    ctx->vertices.ptr = (_sspine_vertex_t*) _sspine_malloc(vbuf_size);
+    ctx->indices.ptr = (uint32_t*) _sspine_malloc(ibuf_size);
+    ctx->commands.ptr = (_sspine_command_t*) _sspine_malloc(cbuf_size);
+
+    sg_buffer_desc vbuf_desc;
+    _sspine_clear(&vbuf_desc, sizeof(vbuf_desc));
+    vbuf_desc.type = SG_BUFFERTYPE_VERTEXBUFFER;
+    vbuf_desc.usage = SG_USAGE_STREAM;
+    vbuf_desc.size = vbuf_size;
+    vbuf_desc.label = "sspine-vbuf";
+    ctx->vbuf = sg_make_buffer(&vbuf_desc);
+    ctx->bind.vertex_buffers[0] = ctx->vbuf;
+
+    sg_buffer_desc ibuf_desc;
+    _sspine_clear(&ibuf_desc, sizeof(ibuf_desc));
+    ibuf_desc.type = SG_BUFFERTYPE_INDEXBUFFER;
+    ibuf_desc.usage = SG_USAGE_STREAM;
+    ibuf_desc.size = ibuf_size;
+    ibuf_desc.label = "sspine-ibuf";
+    ctx->ibuf = sg_make_buffer(&ibuf_desc);
+    ctx->bind.index_buffer = ctx->ibuf;
+
+    // for blend modes, see: https://wiki.libsdl.org/SDL_BlendMode
+    //
+    // NOTE: we're configuring the blend mode for premultiplied alpha,
+    // and then do the premultiplication in the fragment shader
+    // if needed
+    sg_pipeline_desc pip_desc;
+    _sspine_clear(&pip_desc, sizeof(pip_desc));
+    pip_desc.shader = _sspine.shd;
+    pip_desc.layout.buffers[0].stride = sizeof(_sspine_vertex_t);
+    pip_desc.layout.attrs[0].format = SG_VERTEXFORMAT_FLOAT2;
+    pip_desc.layout.attrs[1].format = SG_VERTEXFORMAT_FLOAT2;
+    pip_desc.layout.attrs[2].format = SG_VERTEXFORMAT_UBYTE4N;
+    pip_desc.index_type = SG_INDEXTYPE_UINT32;
+    pip_desc.sample_count = desc->sample_count;
+    pip_desc.depth.pixel_format = desc->depth_format;
+    pip_desc.colors[0].pixel_format = desc->color_format;
+    pip_desc.colors[0].write_mask = desc->color_write_mask;
+    pip_desc.colors[0].blend.enabled = true;
+    pip_desc.colors[0].blend.src_factor_rgb = SG_BLENDFACTOR_ONE;
+    pip_desc.colors[0].blend.dst_factor_rgb = SG_BLENDFACTOR_ONE_MINUS_SRC_ALPHA;
+    pip_desc.colors[0].blend.src_factor_alpha = SG_BLENDFACTOR_ONE;
+    pip_desc.colors[0].blend.dst_factor_alpha = SG_BLENDFACTOR_ONE_MINUS_SRC_ALPHA;
+    pip_desc.label = "sspine-pip-normal/additive";
+    ctx->pip.normal_additive = sg_make_pipeline(&pip_desc);
+
+    pip_desc.colors[0].blend.src_factor_rgb = SG_BLENDFACTOR_ZERO;
+    pip_desc.colors[0].blend.dst_factor_rgb = SG_BLENDFACTOR_SRC_COLOR;
+    pip_desc.colors[0].blend.src_factor_alpha = SG_BLENDFACTOR_ZERO;
+    pip_desc.colors[0].blend.dst_factor_alpha = SG_BLENDFACTOR_ONE;
+    pip_desc.label = "sspine-pip-multiply";
+    ctx->pip.multiply = sg_make_pipeline(&pip_desc);
+
+    return SSPINE_RESOURCESTATE_VALID;
+}
+
+static void _sspine_deinit_context(_sspine_context_t* ctx) {
+    // NOTE: it's ok to call sg_destroy functions with invalid handles
+    sg_destroy_pipeline(ctx->pip.normal_additive);
+    sg_destroy_pipeline(ctx->pip.multiply);
+    sg_destroy_buffer(ctx->ibuf);
+    sg_destroy_buffer(ctx->vbuf);
+    if (ctx->commands.ptr) {
+        _sspine_free(ctx->commands.ptr);
+        ctx->commands.ptr = 0;
+    }
+    if (ctx->indices.ptr) {
+        _sspine_free(ctx->indices.ptr);
+        ctx->indices.ptr = 0;
+    }
+    if (ctx->vertices.ptr) {
+        _sspine_free(ctx->vertices.ptr);
+        ctx->vertices.ptr = 0;
+    }
+}
+
+static void _sspine_destroy_context(sspine_context ctx_id) {
+    _sspine_context_t* ctx = _sspine_lookup_context(ctx_id.id);
+    if (ctx) {
+        _sspine_deinit_context(ctx);
+        _sspine_context_pool_t* p = &_sspine.context_pool;
+        _sspine_clear(ctx, sizeof(_sspine_context_t));
+        _sspine_pool_free_index(&p->pool, _sspine_slot_index(ctx_id.id));
+    }
+}
+
+static void _sspine_destroy_all_contexts(void) {
+    _sspine_context_pool_t* p = &_sspine.context_pool;
+    for (int i = 0; i < p->pool.size; i++) {
+        _sspine_context_t* ctx = &p->items[i];
+        _sspine_destroy_context(_sspine_make_context_handle(ctx->slot.id));
+    }
+}
+
+static sspine_context_desc _sspine_context_desc_defaults(const sspine_context_desc* desc) {
+    sspine_context_desc res = *desc;
+    res.max_vertices = _sspine_def(desc->max_vertices, _SSPINE_DEFAULT_MAX_VERTICES);
+    res.max_commands = _sspine_def(desc->max_commands, _SSPINE_DEFAULT_MAX_COMMANDS);
+    return res;
+}
+
+static bool _sspine_is_default_context(sspine_context ctx_id) {
+    return ctx_id.id == 0x00010001;
+}
+
+//=== ATLAS POOL FUNCTIONS =====================================================
+static void _sspine_setup_atlas_pool(int pool_size) {
+    _sspine_atlas_pool_t* p = &_sspine.atlas_pool;
+    _sspine_init_item_pool(&p->pool, pool_size, (void**)&p->items, sizeof(_sspine_atlas_t));
+}
+
+static void _sspine_discard_atlas_pool(void) {
+    _sspine_atlas_pool_t* p = &_sspine.atlas_pool;
+    _sspine_discard_item_pool(&p->pool, (void**)&p->items);
+}
+
+static sspine_atlas _sspine_make_atlas_handle(uint32_t id) {
+    sspine_atlas handle = { id };
+    return handle;
+}
+
+static _sspine_atlas_t* _sspine_atlas_at(uint32_t id) {
+    SOKOL_ASSERT(SSPINE_INVALID_ID != id);
+    const _sspine_atlas_pool_t* p = &_sspine.atlas_pool;
+    int slot_index = _sspine_slot_index(id);
+    SOKOL_ASSERT((slot_index > _SSPINE_INVALID_SLOT_INDEX) && (slot_index < p->pool.size));
+    return &p->items[slot_index];
+}
+
+static _sspine_atlas_t* _sspine_lookup_atlas(uint32_t id) {
+    if (SSPINE_INVALID_ID != id) {
+        _sspine_atlas_t* atlas = _sspine_atlas_at(id);
+        if (atlas->slot.id == id) {
+            return atlas;
+        }
+    }
+    return 0;
+}
+
+static sspine_atlas _sspine_alloc_atlas(void) {
+    _sspine_atlas_pool_t* p = &_sspine.atlas_pool;
+    int slot_index = _sspine_pool_alloc_index(&p->pool);
+    if (_SSPINE_INVALID_SLOT_INDEX != slot_index) {
+        uint32_t id = _sspine_slot_init(&p->pool, &p->items[slot_index].slot, slot_index);
+        return _sspine_make_atlas_handle(id);
+    }
+    else {
+        // pool exhausted
+        return _sspine_make_atlas_handle(SSPINE_INVALID_ID);
+    }
+}
+
+void _spAtlasPage_disposeTexture(spAtlasPage* self) {
+    if (self->rendererObject != 0) {
+        const sg_image img = { (uint32_t)(uintptr_t)self->rendererObject };
+        sg_destroy_image(img);
+    }
+}
+
+static sspine_resource_state _sspine_init_atlas(_sspine_atlas_t* atlas, const sspine_atlas_desc* desc) {
+    SOKOL_ASSERT(atlas && (atlas->slot.state == SSPINE_RESOURCESTATE_ALLOC));
+    SOKOL_ASSERT(desc);
+    SOKOL_ASSERT(atlas->sp_atlas == 0);
+
+    if ((0 == desc->data.ptr) || (0 == desc->data.size)) {
+        _SSPINE_ERROR(ATLAS_DESC_NO_DATA);
+        return SSPINE_RESOURCESTATE_FAILED;
+    }
+    atlas->overrides = desc->override;
+
+    // NOTE: Spine doesn't detect when invalid or corrupt data is passed here,
+    // not much we can do about this...
+    atlas->sp_atlas = spAtlas_create((const char*)desc->data.ptr, (int)desc->data.size, "", 0);
+    if (0 == atlas->sp_atlas) {
+        _SSPINE_ERROR(SPINE_ATLAS_CREATION_FAILED);
+        return SSPINE_RESOURCESTATE_FAILED;
+    }
+
+    // allocate a sokol-gfx image handle for each page, but the actual image initialization
+    // needs to be delegated to the application
+    for (spAtlasPage* page = atlas->sp_atlas->pages; page != 0; page = page->next) {
+        atlas->num_pages++;
+        const sg_image img = sg_alloc_image();
+        if (sg_query_image_state(img) != SG_RESOURCESTATE_ALLOC) {
+            _SSPINE_ERROR(SG_ALLOC_IMAGE_FAILED);
+            return SSPINE_RESOURCESTATE_FAILED;
+        }
+        page->rendererObject = (void*)(uintptr_t)img.id;
+        if (desc->override.premul_alpha_enabled) {
+            // NOTE: -1 is spine-c convention for 'true'
+            page->pma = -1;
+        }
+        else if (desc->override.premul_alpha_disabled) {
+            page->pma = 0;
+        }
+    }
+    return SSPINE_RESOURCESTATE_VALID;
+}
+
+static void _sspine_deinit_atlas(_sspine_atlas_t* atlas) {
+    if (atlas->sp_atlas) {
+        spAtlas_dispose(atlas->sp_atlas);
+        atlas->sp_atlas = 0;
+    }
+}
+
+static void _sspine_destroy_atlas(sspine_atlas atlas_id) {
+    _sspine_atlas_t* atlas = _sspine_lookup_atlas(atlas_id.id);
+    if (atlas) {
+        _sspine_deinit_atlas(atlas);
+        _sspine_atlas_pool_t* p = &_sspine.atlas_pool;
+        _sspine_clear(atlas, sizeof(_sspine_atlas_t));
+        _sspine_pool_free_index(&p->pool, _sspine_slot_index(atlas_id.id));
+    }
+}
+
+static void _sspine_destroy_all_atlases(void) {
+    _sspine_atlas_pool_t* p = &_sspine.atlas_pool;
+    for (int i = 0; i < p->pool.size; i++) {
+        _sspine_atlas_t* atlas = &p->items[i];
+        _sspine_destroy_atlas(_sspine_make_atlas_handle(atlas->slot.id));
+    }
+}
+
+static sspine_atlas_desc _sspine_atlas_desc_defaults(const sspine_atlas_desc* desc) {
+    sspine_atlas_desc res = *desc;
+    return res;
+}
+
+static spAtlasPage* _sspine_lookup_atlas_page(uint32_t atlas_id, int page_index) {
+    _sspine_atlas_t* atlas = _sspine_lookup_atlas(atlas_id);
+    if (atlas) {
+        if ((page_index >= 0) && (page_index < atlas->num_pages)) {
+            int i = 0;
+            for (spAtlasPage* page = atlas->sp_atlas->pages; page != 0; page = page->next, i++) {
+                if (i == page_index) {
+                    return page;
+                }
+            }
+        }
+    }
+    return 0;
+}
+
+//=== SKELETON POOL FUNCTIONS ==================================================
+static void _sspine_setup_skeleton_pool(int pool_size) {
+    _sspine_skeleton_pool_t* p = &_sspine.skeleton_pool;
+    _sspine_init_item_pool(&p->pool, pool_size, (void**)&p->items, sizeof(_sspine_skeleton_t));
+}
+
+static void _sspine_discard_skeleton_pool(void) {
+    _sspine_skeleton_pool_t* p = &_sspine.skeleton_pool;
+    _sspine_discard_item_pool(&p->pool, (void**)&p->items);
+}
+
+static sspine_skeleton _sspine_make_skeleton_handle(uint32_t id) {
+    sspine_skeleton handle = { id };
+    return handle;
+}
+
+static _sspine_skeleton_t* _sspine_skeleton_at(uint32_t id) {
+    SOKOL_ASSERT(SSPINE_INVALID_ID != id);
+    const _sspine_skeleton_pool_t* p = &_sspine.skeleton_pool;
+    int slot_index = _sspine_slot_index(id);
+    SOKOL_ASSERT((slot_index > _SSPINE_INVALID_SLOT_INDEX) && (slot_index < p->pool.size));
+    return &p->items[slot_index];
+}
+
+static _sspine_skeleton_t* _sspine_lookup_skeleton(uint32_t id) {
+    if (SSPINE_INVALID_ID != id) {
+        _sspine_skeleton_t* skeleton = _sspine_skeleton_at(id);
+        if (skeleton->slot.id == id) {
+            return skeleton;
+        }
+    }
+    return 0;
+}
+
+static sspine_skeleton _sspine_alloc_skeleton(void) {
+    _sspine_skeleton_pool_t* p = &_sspine.skeleton_pool;
+    int slot_index = _sspine_pool_alloc_index(&p->pool);
+    if (_SSPINE_INVALID_SLOT_INDEX != slot_index) {
+        uint32_t id = _sspine_slot_init(&p->pool, &p->items[slot_index].slot, slot_index);
+        return _sspine_make_skeleton_handle(id);
+    }
+    else {
+        // pool exhausted
+        return _sspine_make_skeleton_handle(SSPINE_INVALID_ID);
+    }
+}
+
+static sspine_resource_state _sspine_init_skeleton(_sspine_skeleton_t* skeleton, const sspine_skeleton_desc* desc) {
+    SOKOL_ASSERT(skeleton && (skeleton->slot.state == SSPINE_RESOURCESTATE_ALLOC));
+    SOKOL_ASSERT(desc);
+
+    if ((0 == desc->json_data) && ((0 == desc->binary_data.ptr) || (0 == desc->binary_data.size))) {
+        _SSPINE_ERROR(SKELETON_DESC_NO_DATA);
+        return SSPINE_RESOURCESTATE_FAILED;
+    }
+    if (desc->atlas.id == SSPINE_INVALID_ID) {
+        _SSPINE_ERROR(SKELETON_DESC_NO_ATLAS);
+        return SSPINE_RESOURCESTATE_FAILED;
+    }
+
+    skeleton->atlas.id = desc->atlas.id;
+    skeleton->atlas.ptr = _sspine_lookup_atlas(skeleton->atlas.id);
+    if (!_sspine_atlas_ref_valid(&skeleton->atlas)) {
+        _SSPINE_ERROR(SKELETON_ATLAS_NOT_VALID);
+        return SSPINE_RESOURCESTATE_FAILED;
+    }
+    _sspine_atlas_t* atlas = skeleton->atlas.ptr;
+    if (SSPINE_RESOURCESTATE_VALID != atlas->slot.state) {
+        _SSPINE_ERROR(SKELETON_ATLAS_NOT_VALID);
+        return SSPINE_RESOURCESTATE_FAILED;
+    }
+    SOKOL_ASSERT(atlas->sp_atlas);
+
+    if (desc->json_data) {
+        spSkeletonJson* skel_json = spSkeletonJson_create(atlas->sp_atlas);
+        SOKOL_ASSERT(skel_json);
+        skel_json->scale = desc->prescale;
+        skeleton->sp_skel_data = spSkeletonJson_readSkeletonData(skel_json, desc->json_data);
+        spSkeletonJson_dispose(skel_json); skel_json = 0;
+        if (0 == skeleton->sp_skel_data) {
+            _SSPINE_ERROR(SPINE_SKELETON_DATA_CREATION_FAILED);
+            return SSPINE_RESOURCESTATE_FAILED;
+        }
+    }
+    else {
+        spSkeletonBinary* skel_bin = spSkeletonBinary_create(atlas->sp_atlas);
+        SOKOL_ASSERT(skel_bin);
+        skel_bin->scale = desc->prescale;
+        skeleton->sp_skel_data = spSkeletonBinary_readSkeletonData(skel_bin, desc->binary_data.ptr, (int)desc->binary_data.size);
+        spSkeletonBinary_dispose(skel_bin); skel_bin = 0;
+        if (0 == skeleton->sp_skel_data) {
+            _SSPINE_ERROR(SPINE_SKELETON_DATA_CREATION_FAILED);
+            return SSPINE_RESOURCESTATE_FAILED;
+        }
+    }
+    SOKOL_ASSERT(skeleton->sp_skel_data);
+
+    skeleton->sp_anim_data = spAnimationStateData_create(skeleton->sp_skel_data);
+    SOKOL_ASSERT(skeleton->sp_anim_data);
+    skeleton->sp_anim_data->defaultMix = desc->anim_default_mix;
+
+    // get the max number of vertices in any mesh attachment
+    int max_vertex_count = 4;   // number of vertices in a 'region attachment' (a 2-triangle quad)
+    const spSkeletonData* sp_skel_data = skeleton->sp_skel_data;
+    for (int skinIndex = 0; skinIndex < sp_skel_data->skinsCount; skinIndex++) {
+        const spSkin* sp_skin = sp_skel_data->skins[skinIndex];
+        const spSkinEntry* skin_entry = spSkin_getAttachments(sp_skin);
+        if (skin_entry) do {
+            if (skin_entry->attachment) {
+                if (skin_entry->attachment->type == SP_ATTACHMENT_MESH) {
+                    const spMeshAttachment* mesh_attachment = (spMeshAttachment*)skin_entry->attachment;
+                    // worldVerticesLength is number of floats
+                    SOKOL_ASSERT((mesh_attachment->super.worldVerticesLength & 1) == 0);
+                    const int num_vertices = mesh_attachment->super.worldVerticesLength / 2;
+                    if (num_vertices > max_vertex_count) {
+                        max_vertex_count = num_vertices;
+                    }
+                }
+            }
+        } while ((skin_entry = skin_entry->next) != 0);
+    }
+
+    // allocate a shared vertex transform buffer (big enough to hold vertices for biggest mesh attachment)
+    skeleton->tform_buf.num = max_vertex_count;
+    skeleton->tform_buf.ptr = (sspine_vec2*) _sspine_malloc((size_t)skeleton->tform_buf.num * sizeof(sspine_vec2));
+
+    return SSPINE_RESOURCESTATE_VALID;
+}
+
+static void _sspine_deinit_skeleton(_sspine_skeleton_t* skeleton) {
+    if (skeleton->tform_buf.ptr) {
+        _sspine_free(skeleton->tform_buf.ptr);
+        skeleton->tform_buf.ptr = 0;
+    }
+    if (skeleton->sp_anim_data) {
+        spAnimationStateData_dispose(skeleton->sp_anim_data);
+        skeleton->sp_anim_data = 0;
+    }
+    if (skeleton->sp_skel_data) {
+        spSkeletonData_dispose(skeleton->sp_skel_data);
+        skeleton->sp_skel_data = 0;
+    }
+}
+
+static void _sspine_destroy_skeleton(sspine_skeleton skeleton_id) {
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id.id);
+    if (skeleton) {
+        _sspine_deinit_skeleton(skeleton);
+        _sspine_skeleton_pool_t* p = &_sspine.skeleton_pool;
+        _sspine_clear(skeleton, sizeof(_sspine_skeleton_t));
+        _sspine_pool_free_index(&p->pool, _sspine_slot_index(skeleton_id.id));
+    }
+}
+
+static void _sspine_destroy_all_skeletons(void) {
+    _sspine_skeleton_pool_t* p = &_sspine.skeleton_pool;
+    for (int i = 0; i < p->pool.size; i++) {
+        _sspine_skeleton_t* skeleton = &p->items[i];
+        _sspine_destroy_skeleton(_sspine_make_skeleton_handle(skeleton->slot.id));
+    }
+}
+
+static sspine_skeleton_desc _sspine_skeleton_desc_defaults(const sspine_skeleton_desc* desc) {
+    sspine_skeleton_desc res = *desc;
+    res.prescale = _sspine_def(desc->prescale, 1.0f);
+    res.anim_default_mix = _sspine_def(desc->anim_default_mix, 0.2f);
+    return res;
+}
+
+static spBoneData* _sspine_lookup_bone_data(uint32_t skeleton_id, int bone_index) {
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data && skeleton->sp_skel_data->bones);
+        if ((bone_index >= 0) && (bone_index <= skeleton->sp_skel_data->bonesCount)) {
+            return skeleton->sp_skel_data->bones[bone_index];
+        }
+    }
+    return 0;
+}
+
+static spSlotData* _sspine_lookup_slot_data(uint32_t skeleton_id, int slot_index) {
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data && skeleton->sp_skel_data->slots);
+        if ((slot_index >= 0) && (slot_index <= skeleton->sp_skel_data->slotsCount)) {
+            return skeleton->sp_skel_data->slots[slot_index];
+        }
+    }
+    return 0;
+}
+
+static spEventData* _sspine_lookup_event_data(uint32_t skeleton_id, int event_index) {
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data && skeleton->sp_skel_data->events);
+        if ((event_index >= 0) && (event_index < skeleton->sp_skel_data->eventsCount)) {
+            return skeleton->sp_skel_data->events[event_index];
+        }
+    }
+    return 0;
+}
+
+static spIkConstraintData* _sspine_lookup_ikconstraint_data(uint32_t skeleton_id, int iktarget_index) {
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data && skeleton->sp_skel_data->ikConstraints);
+        if ((iktarget_index >= 0) && (iktarget_index < skeleton->sp_skel_data->ikConstraintsCount)) {
+            return skeleton->sp_skel_data->ikConstraints[iktarget_index];
+        }
+    }
+    return 0;
+}
+
+static spSkin* _sspine_lookup_skin(uint32_t skeleton_id, int skin_index) {
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data && skeleton->sp_skel_data->skins);
+        if ((skin_index >= 0) && (skin_index < skeleton->sp_skel_data->skinsCount)) {
+            return skeleton->sp_skel_data->skins[skin_index];
+        }
+    }
+    return 0;
+}
+
+//=== SKINSET POOL FUNCTIONS ===================================================
+static void _sspine_setup_skinset_pool(int pool_size) {
+    _sspine_skinset_pool_t* p = &_sspine.skinset_pool;
+    _sspine_init_item_pool(&p->pool, pool_size, (void**)&p->items, sizeof(_sspine_skinset_t));
+}
+
+static void _sspine_discard_skinset_pool(void) {
+    _sspine_skinset_pool_t* p = &_sspine.skinset_pool;
+    _sspine_discard_item_pool(&p->pool, (void**)&p->items);
+}
+
+static sspine_skinset _sspine_make_skinset_handle(uint32_t id) {
+    sspine_skinset handle = { id };
+    return handle;
+}
+
+static _sspine_skinset_t* _sspine_skinset_at(uint32_t id) {
+    SOKOL_ASSERT(SSPINE_INVALID_ID != id);
+    const _sspine_skinset_pool_t* p = &_sspine.skinset_pool;
+    int slot_index = _sspine_slot_index(id);
+    SOKOL_ASSERT((slot_index > _SSPINE_INVALID_SLOT_INDEX) && (slot_index < p->pool.size));
+    return &p->items[slot_index];
+}
+
+static _sspine_skinset_t* _sspine_lookup_skinset(uint32_t id) {
+    if (SSPINE_INVALID_ID != id) {
+        _sspine_skinset_t* skinset = _sspine_skinset_at(id);
+        if (skinset->slot.id == id) {
+            return skinset;
+        }
+    }
+    return 0;
+}
+
+static sspine_skinset _sspine_alloc_skinset(void) {
+    _sspine_skinset_pool_t* p = &_sspine.skinset_pool;
+    int slot_index = _sspine_pool_alloc_index(&p->pool);
+    if (_SSPINE_INVALID_SLOT_INDEX != slot_index) {
+        uint32_t id = _sspine_slot_init(&p->pool, &p->items[slot_index].slot, slot_index);
+        return _sspine_make_skinset_handle(id);
+    }
+    else {
+        // pool exhausted
+        return _sspine_make_skinset_handle(SSPINE_INVALID_ID);
+    }
+}
+
+static sspine_resource_state _sspine_init_skinset(_sspine_skinset_t* skinset, const sspine_skinset_desc* desc) {
+    SOKOL_ASSERT(skinset && (skinset->slot.state == SSPINE_RESOURCESTATE_ALLOC));
+    SOKOL_ASSERT(desc);
+
+    if (desc->skeleton.id == SSPINE_INVALID_ID) {
+        _SSPINE_ERROR(SKINSET_DESC_NO_SKELETON);
+        return SSPINE_RESOURCESTATE_FAILED;
+    }
+    skinset->skel.id = desc->skeleton.id;
+    skinset->skel.ptr = _sspine_lookup_skeleton(desc->skeleton.id);
+    if (!_sspine_skeleton_ref_valid(&skinset->skel)) {
+        _SSPINE_ERROR(SKINSET_SKELETON_NOT_VALID);
+        return SSPINE_RESOURCESTATE_FAILED;
+    }
+    _sspine_skeleton_t* skel = skinset->skel.ptr;
+    if (SSPINE_RESOURCESTATE_VALID != skel->slot.state) {
+        _SSPINE_ERROR(SKINSET_SKELETON_NOT_VALID);
+        return SSPINE_RESOURCESTATE_FAILED;
+    }
+    SOKOL_ASSERT(skel->sp_skel_data);
+    skinset->sp_skin = spSkin_create("skinset");
+    for (int i = 0; i < SSPINE_MAX_SKINSET_SKINS; i++) {
+        if (desc->skins[i].skeleton_id != SSPINE_INVALID_ID) {
+            spSkin* skin = _sspine_lookup_skin(desc->skins[i].skeleton_id, desc->skins[i].index);
+            if (0 == skin) {
+                _SSPINE_ERROR(SKINSET_INVALID_SKIN_HANDLE);
+                return SSPINE_RESOURCESTATE_FAILED;
+            }
+            spSkin_addSkin(skinset->sp_skin, skin);
+        }
+    }
+    return SSPINE_RESOURCESTATE_VALID;
+}
+
+static void _sspine_deinit_skinset(_sspine_skinset_t* skinset) {
+    if (skinset->sp_skin) {
+        spSkin_clear(skinset->sp_skin);
+        spSkin_dispose(skinset->sp_skin);
+        skinset->sp_skin = 0;
+    }
+}
+
+static void _sspine_destroy_skinset(sspine_skinset skinset_id) {
+    _sspine_skinset_t* skinset = _sspine_lookup_skinset(skinset_id.id);
+    if (skinset) {
+        _sspine_deinit_skinset(skinset);
+        _sspine_skinset_pool_t* p = &_sspine.skinset_pool;
+        _sspine_clear(skinset, sizeof(_sspine_skinset_t));
+        _sspine_pool_free_index(&p->pool, _sspine_slot_index(skinset_id.id));
+    }
+}
+
+static void _sspine_destroy_all_skinsets(void) {
+    _sspine_skinset_pool_t* p = &_sspine.skinset_pool;
+    for (int i = 0; i < p->pool.size; i++) {
+        _sspine_skinset_t* skinset = &p->items[i];
+        _sspine_destroy_skinset(_sspine_make_skinset_handle(skinset->slot.id));
+    }
+}
+
+static sspine_skinset_desc _sspine_skinset_desc_defaults(const sspine_skinset_desc* desc) {
+    sspine_skinset_desc res = *desc;
+    return res;
+}
+
+//=== INSTANCE POOL FUNCTIONS ==================================================
+static void _sspine_setup_instance_pool(int pool_size) {
+    _sspine_instance_pool_t* p = &_sspine.instance_pool;
+    _sspine_init_item_pool(&p->pool, pool_size, (void**)&p->items, sizeof(_sspine_instance_t));
+}
+
+static void _sspine_discard_instance_pool(void) {
+    _sspine_instance_pool_t* p = &_sspine.instance_pool;
+    _sspine_discard_item_pool(&p->pool, (void**)&p->items);
+}
+
+static sspine_instance _sspine_make_instance_handle(uint32_t id) {
+    sspine_instance handle = { id };
+    return handle;
+}
+
+static _sspine_instance_t* _sspine_instance_at(uint32_t id) {
+    SOKOL_ASSERT(SSPINE_INVALID_ID != id);
+    const _sspine_instance_pool_t* p = &_sspine.instance_pool;
+    int slot_index = _sspine_slot_index(id);
+    SOKOL_ASSERT((slot_index > _SSPINE_INVALID_SLOT_INDEX) && (slot_index < p->pool.size));
+    return &p->items[slot_index];
+}
+
+static _sspine_instance_t* _sspine_lookup_instance(uint32_t id) {
+    if (SSPINE_INVALID_ID != id) {
+        _sspine_instance_t* instance = _sspine_instance_at(id);
+        if (instance->slot.id == id) {
+            return instance;
+        }
+    }
+    return 0;
+}
+
+static sspine_instance _sspine_alloc_instance(void) {
+    _sspine_instance_pool_t* p = &_sspine.instance_pool;
+    sspine_instance res;
+    int slot_index = _sspine_pool_alloc_index(&p->pool);
+    if (_SSPINE_INVALID_SLOT_INDEX != slot_index) {
+        uint32_t id = _sspine_slot_init(&p->pool, &p->items[slot_index].slot, slot_index);
+        res = _sspine_make_instance_handle(id);
+    }
+    else {
+        // pool exhausted
+        res = _sspine_make_instance_handle(SSPINE_INVALID_ID);
+    }
+    return res;
+}
+
+static void _sspine_rewind_triggered_events(_sspine_instance_t* instance) {
+    instance->cur_triggered_event_index = 0;
+    _sspine_clear(instance->triggered_events, sizeof(instance->triggered_events));
+}
+
+static sspine_triggered_event_info* _sspine_next_triggered_event_info(_sspine_instance_t* instance) {
+    if (instance->cur_triggered_event_index < _SSPINE_MAX_TRIGGERED_EVENTS) {
+        return &instance->triggered_events[instance->cur_triggered_event_index++];
+    }
+    else {
+        return 0;
+    }
+}
+
+static void _sspine_event_listener(spAnimationState* sp_anim_state, spEventType sp_event_type, spTrackEntry* sp_track_entry, spEvent* sp_event) {
+    if (sp_event_type == SP_ANIMATION_EVENT) {
+        SOKOL_ASSERT(sp_anim_state && sp_track_entry && sp_event); (void)sp_track_entry;
+        SOKOL_ASSERT(sp_event->data && sp_event->data->name);
+        _sspine_instance_t* instance = _sspine_lookup_instance((uint32_t)(uintptr_t)sp_anim_state->userData);
+        if (_sspine_instance_and_deps_valid(instance)) {
+            sspine_triggered_event_info* info = _sspine_next_triggered_event_info(instance);
+            if (info) {
+                // FIXME: this sucks, but we really need the event index
+                _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(instance->skel.id);
+                SOKOL_ASSERT(skeleton && skeleton->sp_skel_data->events);
+                const spEventData* sp_event_data = sp_event->data;
+                for (int i = 0; i < skeleton->sp_skel_data->eventsCount; i++) {
+                    if (sp_event_data == skeleton->sp_skel_data->events[i]) {
+                        info->event = _sspine_event(skeleton->slot.id, i);
+                        break;
+                    }
+                }
+                SOKOL_ASSERT(info->event.skeleton_id != SSPINE_INVALID_ID);
+                info->valid = true;
+                info->time = sp_event->time;
+                info->int_value = sp_event->intValue;
+                info->float_value = sp_event->floatValue;
+                info->volume = sp_event->volume;
+                info->balance = sp_event->balance;
+                info->string_value = _sspine_string(sp_event->stringValue);
+                if (info->string_value.truncated) {
+                    _SSPINE_WARN(STRING_TRUNCATED);
+                }
+            }
+        }
+    }
+}
+
+static sspine_resource_state _sspine_init_instance(_sspine_instance_t* instance, const sspine_instance_desc* desc) {
+    SOKOL_ASSERT(instance && (instance->slot.state == SSPINE_RESOURCESTATE_ALLOC));
+    SOKOL_ASSERT(desc);
+
+    if (desc->skeleton.id == SSPINE_INVALID_ID) {
+        _SSPINE_ERROR(INSTANCE_DESC_NO_SKELETON);
+        return SSPINE_RESOURCESTATE_FAILED;
+    }
+    instance->skel.id = desc->skeleton.id;
+    instance->skel.ptr = _sspine_lookup_skeleton(instance->skel.id);
+    if (!_sspine_skeleton_ref_valid(&instance->skel)) {
+        _SSPINE_ERROR(INSTANCE_SKELETON_NOT_VALID);
+        return SSPINE_RESOURCESTATE_FAILED;
+    }
+    _sspine_skeleton_t* skel = instance->skel.ptr;
+    if (SSPINE_RESOURCESTATE_VALID != skel->slot.state) {
+        _SSPINE_ERROR(INSTANCE_SKELETON_NOT_VALID);
+        return SSPINE_RESOURCESTATE_FAILED;
+    }
+    instance->atlas = skel->atlas;
+    if (!_sspine_atlas_ref_valid(&instance->atlas)) {
+        _SSPINE_ERROR(INSTANCE_ATLAS_NOT_VALID);
+        return SSPINE_RESOURCESTATE_FAILED;
+    }
+    if (SSPINE_RESOURCESTATE_VALID != instance->atlas.ptr->slot.state) {
+        _SSPINE_ERROR(INSTANCE_ATLAS_NOT_VALID);
+        return SSPINE_RESOURCESTATE_FAILED;
+    }
+    SOKOL_ASSERT(skel->sp_skel_data);
+    SOKOL_ASSERT(skel->sp_anim_data);
+
+    instance->sp_skel = spSkeleton_create(skel->sp_skel_data);
+    if (0 == instance->sp_skel) {
+        _SSPINE_ERROR(SPINE_SKELETON_CREATION_FAILED);
+        return SSPINE_RESOURCESTATE_FAILED;
+    }
+    instance->sp_anim_state = spAnimationState_create(skel->sp_anim_data);
+    if (0 == instance->sp_anim_state) {
+        _SSPINE_ERROR(SPINE_ANIMATIONSTATE_CREATION_FAILED);
+        return SSPINE_RESOURCESTATE_FAILED;
+    }
+    instance->sp_clip = spSkeletonClipping_create();
+    if (0 == instance->sp_clip) {
+        _SSPINE_ERROR(SPINE_SKELETONCLIPPING_CREATION_FAILED);
+        return SSPINE_RESOURCESTATE_FAILED;
+    }
+
+    instance->sp_anim_state->userData = (void*)(uintptr_t)instance->slot.id;
+    instance->sp_anim_state->listener = _sspine_event_listener;
+
+    spSkeleton_setToSetupPose(instance->sp_skel);
+    spAnimationState_update(instance->sp_anim_state, 0.0f);
+    spAnimationState_apply(instance->sp_anim_state, instance->sp_skel);
+    spSkeleton_updateWorldTransform(instance->sp_skel);
+
+    return SSPINE_RESOURCESTATE_VALID;
+}
+
+static void _sspine_deinit_instance(_sspine_instance_t* instance) {
+    if (instance->sp_clip) {
+        spSkeletonClipping_dispose(instance->sp_clip);
+        instance->sp_clip = 0;
+    }
+    if (instance->sp_anim_state) {
+        spAnimationState_dispose(instance->sp_anim_state);
+        instance->sp_anim_state = 0;
+    }
+    if (instance->sp_skel) {
+        spSkeleton_dispose(instance->sp_skel);
+        instance->sp_skel = 0;
+    }
+}
+
+static void _sspine_destroy_instance(sspine_instance instance_id) {
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+    if (instance) {
+        _sspine_deinit_instance(instance);
+        _sspine_instance_pool_t* p = &_sspine.instance_pool;
+        _sspine_clear(instance, sizeof(_sspine_instance_t));
+        _sspine_pool_free_index(&p->pool, _sspine_slot_index(instance_id.id));
+    }
+}
+
+static void _sspine_destroy_all_instances(void) {
+    _sspine_instance_pool_t* p = &_sspine.instance_pool;
+    for (int i = 0; i < p->pool.size; i++) {
+        _sspine_instance_t* instance = &p->items[i];
+        _sspine_destroy_instance(_sspine_make_instance_handle(instance->slot.id));
+    }
+}
+
+static spAnimation* _sspine_lookup_skeleton_anim(uint32_t skeleton_id, int anim_index) {
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data);
+        if ((anim_index >= 0) && (anim_index < skeleton->sp_skel_data->animationsCount)) {
+            return skeleton->sp_skel_data->animations[anim_index];
+        }
+    }
+    return 0;
+}
+
+static spAnimation* _sspine_lookup_instance_anim(uint32_t instance_id, uint32_t skeleton_id, int anim_index) {
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id);
+    if (_sspine_instance_and_deps_valid(instance) && (instance->skel.id == skeleton_id)) {
+        SOKOL_ASSERT(instance->sp_skel && instance->sp_skel->data);
+        if ((anim_index >= 0) && (anim_index < instance->sp_skel->data->animationsCount)) {
+            return instance->sp_skel->data->animations[anim_index];
+        }
+    }
+    return 0;
+}
+
+static spBone* _sspine_lookup_bone(uint32_t instance_id, uint32_t skeleton_id, int bone_index) {
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id);
+    if (_sspine_instance_and_deps_valid(instance) && (instance->skel.id == skeleton_id)) {
+        SOKOL_ASSERT(instance->sp_skel && instance->sp_skel->bones);
+        if ((bone_index >= 0) && (bone_index <= instance->sp_skel->bonesCount)) {
+            return instance->sp_skel->bones[bone_index];
+        }
+    }
+    return 0;
+}
+
+static spSlot* _sspine_lookup_slot(uint32_t instance_id, uint32_t skeleton_id, int slot_index) {
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id);
+    if (_sspine_instance_and_deps_valid(instance) && (instance->skel.id == skeleton_id)) {
+        SOKOL_ASSERT(instance->sp_skel && instance->sp_skel->slots);
+        if ((slot_index >= 0) && (slot_index <= instance->sp_skel->slotsCount)) {
+            return instance->sp_skel->slots[slot_index];
+        }
+    }
+    return 0;
+}
+
+static spIkConstraint* _sspine_lookup_ikconstraint(uint32_t instance_id, uint32_t skeleton_id, int iktarget_index) {
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id);
+    if (_sspine_instance_and_deps_valid(instance) && (instance->skel.id == skeleton_id)) {
+        SOKOL_ASSERT(instance->sp_skel && instance->sp_skel->ikConstraints);
+        if ((iktarget_index >= 0) && (iktarget_index < instance->sp_skel->ikConstraintsCount)) {
+            return instance->sp_skel->ikConstraints[iktarget_index];
+        }
+    }
+    return 0;
+}
+
+static sspine_instance_desc _sspine_instance_desc_defaults(const sspine_instance_desc* desc) {
+    sspine_instance_desc res = *desc;
+    return res;
+}
+
+// return sspine_desc with patched defaults
+static sspine_desc _sspine_desc_defaults(const sspine_desc* desc) {
+    SOKOL_ASSERT((desc->allocator.alloc && desc->allocator.free) || (!desc->allocator.alloc && !desc->allocator.free));
+    sspine_desc res = *desc;
+    res.max_vertices = _sspine_def(desc->max_vertices, _SSPINE_DEFAULT_MAX_VERTICES);
+    res.max_commands = _sspine_def(desc->max_commands, _SSPINE_DEFAULT_MAX_COMMANDS);
+    res.context_pool_size = _sspine_def(desc->context_pool_size, _SSPINE_DEFAULT_CONTEXT_POOL_SIZE);
+    res.atlas_pool_size = _sspine_def(desc->atlas_pool_size, _SSPINE_DEFAULT_ATLAS_POOL_SIZE);
+    res.skeleton_pool_size = _sspine_def(desc->skeleton_pool_size, _SSPINE_DEFAULT_SKELETON_POOL_SIZE);
+    res.skinset_pool_size = _sspine_def(desc->skinset_pool_size, _SSPINE_DEFAULT_SKINSET_POOL_SIZE);
+    res.instance_pool_size = _sspine_def(desc->instance_pool_size, _SSPINE_DEFAULT_INSTANCE_POOL_SIZE);
+    return res;
+}
+
+static sspine_context_desc _sspine_as_context_desc(const sspine_desc* desc) {
+    sspine_context_desc ctx_desc;
+    _sspine_clear(&ctx_desc, sizeof(ctx_desc));
+    ctx_desc.max_vertices = desc->max_vertices;
+    ctx_desc.max_commands = desc->max_commands;
+    ctx_desc.color_format = desc->color_format;
+    ctx_desc.depth_format = desc->depth_format;
+    ctx_desc.sample_count = desc->sample_count;
+    ctx_desc.color_write_mask = desc->color_write_mask;
+    return ctx_desc;
+}
+
+static sg_filter _sspine_as_image_filter(spAtlasFilter filter) {
+    switch (filter) {
+        case SP_ATLAS_UNKNOWN_FILTER: return _SG_FILTER_DEFAULT;
+        case SP_ATLAS_NEAREST: return SG_FILTER_NEAREST;
+        case SP_ATLAS_LINEAR: return SG_FILTER_LINEAR;
+        case SP_ATLAS_MIPMAP: return SG_FILTER_LINEAR_MIPMAP_NEAREST;
+        case SP_ATLAS_MIPMAP_NEAREST_NEAREST: return SG_FILTER_NEAREST_MIPMAP_NEAREST;
+        case SP_ATLAS_MIPMAP_LINEAR_NEAREST: return SG_FILTER_LINEAR_MIPMAP_NEAREST;
+        case SP_ATLAS_MIPMAP_NEAREST_LINEAR: return SG_FILTER_NEAREST_MIPMAP_LINEAR;
+        case SP_ATLAS_MIPMAP_LINEAR_LINEAR: return SG_FILTER_LINEAR_MIPMAP_LINEAR;
+        default: return _SG_FILTER_DEFAULT;
+    }
+}
+
+static sg_wrap _sspine_as_image_wrap(spAtlasWrap wrap) {
+    switch (wrap) {
+        case SP_ATLAS_MIRROREDREPEAT: return SG_WRAP_MIRRORED_REPEAT;
+        case SP_ATLAS_CLAMPTOEDGE: return SG_WRAP_CLAMP_TO_EDGE;
+        case SP_ATLAS_REPEAT: return SG_WRAP_REPEAT;
+        default: return _SG_WRAP_DEFAULT;
+    }
+}
+
+static void _sspine_init_image_info(const _sspine_atlas_t* atlas, int index, sspine_image_info* info, bool with_overrides) {
+    spAtlasPage* page = _sspine_lookup_atlas_page(atlas->slot.id, index);
+    SOKOL_ASSERT(page);
+    SOKOL_ASSERT(page->name);
+    info->valid = true;
+    info->sgimage.id = (uint32_t)(uintptr_t)page->rendererObject;
+    if (with_overrides && (atlas->overrides.min_filter != _SG_FILTER_DEFAULT)) {
+        info->min_filter = atlas->overrides.min_filter;
+    }
+    else {
+        info->min_filter = _sspine_as_image_filter(page->minFilter);
+    }
+    if (with_overrides && (atlas->overrides.mag_filter != _SG_FILTER_DEFAULT)) {
+        info->mag_filter = atlas->overrides.mag_filter;
+    }
+    else {
+        info->mag_filter = _sspine_as_image_filter(page->magFilter);
+    }
+    if (with_overrides && (atlas->overrides.wrap_u != _SG_WRAP_DEFAULT)) {
+        info->wrap_u = atlas->overrides.wrap_u;
+    }
+    else {
+        info->wrap_u = _sspine_as_image_wrap(page->uWrap);
+    }
+    if (with_overrides && (atlas->overrides.wrap_v != _SG_WRAP_DEFAULT)) {
+        info->wrap_v = atlas->overrides.wrap_v;
+    }
+    else {
+        info->wrap_v = _sspine_as_image_wrap(page->vWrap);
+    }
+    info->width = page->width;
+    info->height = page->height;
+    // NOTE: override already happened in atlas init
+    info->premul_alpha = page->pma != 0;
+    info->filename = _sspine_string(page->name);
+    if (info->filename.truncated) {
+        _SSPINE_WARN(STRING_TRUNCATED);
+    }
+}
+
+static void _sspine_check_rewind_commands(_sspine_context_t* ctx) {
+    if (_sspine.frame_count != ctx->commands.rewind_frame_count) {
+        ctx->commands.cur = 0;
+        ctx->commands.rewind_frame_count = _sspine.frame_count;
+    }
+}
+
+static _sspine_command_t* _sspine_next_command(_sspine_context_t* ctx) {
+    _sspine_check_rewind_commands(ctx);
+    if ((ctx->commands.cur + 1) <= ctx->commands.num) {
+        return &(ctx->commands.ptr[ctx->commands.cur++]);
+    }
+    else {
+        _SSPINE_ERROR(COMMAND_BUFFER_OVERFLOW);
+        return 0;
+    }
+}
+
+static _sspine_command_t* _sspine_prev_command(_sspine_context_t* ctx) {
+    _sspine_check_rewind_commands(ctx);
+    if ((ctx->commands.cur > 0) && (ctx->commands.cur <= ctx->commands.num)) {
+        return &ctx->commands.ptr[ctx->commands.cur - 1];
+    }
+    else {
+        return 0;
+    }
+}
+
+static void _sspine_check_rewind_vertices(_sspine_context_t* ctx) {
+    if (_sspine.frame_count != ctx->vertices.rewind_frame_count) {
+        ctx->vertices.cur = 0;
+        ctx->vertices.rewind_frame_count = _sspine.frame_count;
+    }
+}
+
+static _sspine_alloc_vertices_result_t _sspine_alloc_vertices(_sspine_context_t* ctx, int num) {
+    _sspine_check_rewind_vertices(ctx);
+    _sspine_alloc_vertices_result_t res;
+    _sspine_clear(&res, sizeof(res));
+    if ((ctx->vertices.cur + num) <= ctx->vertices.num) {
+        res.ptr = &(ctx->vertices.ptr[ctx->vertices.cur]);
+        res.index = ctx->vertices.cur;
+        ctx->vertices.cur += num;
+    }
+    else {
+        _SSPINE_ERROR(VERTEX_BUFFER_OVERFLOW);
+    }
+    return res;
+}
+
+static void _sspine_check_rewind_indices(_sspine_context_t* ctx) {
+    if (_sspine.frame_count != ctx->indices.rewind_frame_count) {
+        ctx->indices.cur = 0;
+        ctx->indices.rewind_frame_count = _sspine.frame_count;
+    }
+}
+
+static _sspine_alloc_indices_result_t _sspine_alloc_indices(_sspine_context_t* ctx, int num) {
+    _sspine_check_rewind_indices(ctx);
+    _sspine_alloc_indices_result_t res;
+    _sspine_clear(&res, sizeof(res));
+    if ((ctx->indices.cur + num) <= ctx->indices.num) {
+        res.ptr = &(ctx->indices.ptr[ctx->indices.cur]);
+        res.index = ctx->indices.cur;
+        ctx->indices.cur += num;
+    }
+    else {
+        _SSPINE_ERROR(INDEX_BUFFER_OVERFLOW);
+    }
+    return res;
+}
+
+static void _sspine_draw_instance(_sspine_context_t* ctx, _sspine_instance_t* instance, int layer) {
+    SOKOL_ASSERT(_sspine_instance_and_deps_valid(instance));
+    SOKOL_ASSERT(instance->sp_skel);
+    SOKOL_ASSERT(instance->sp_anim_state);
+    SOKOL_ASSERT(instance->sp_clip);
+
+    // see: https://github.com/EsotericSoftware/spine-runtimes/blob/4.1/spine-sdl/src/spine-sdl-c.c
+    const spSkeleton* sp_skel = instance->sp_skel;
+    float* tform_buf = (float*)instance->skel.ptr->tform_buf.ptr;
+    const int max_tform_buf_verts = instance->skel.ptr->tform_buf.num;
+    SOKOL_UNUSED(max_tform_buf_verts); // only used in asserts
+    const int tform_buf_stride = 2; // each element is 2 floats
+    spSkeletonClipping* sp_clip = instance->sp_clip;
+    for (int slot_index = 0; slot_index < sp_skel->slotsCount; slot_index++) {
+        spSlot* sp_slot = sp_skel->drawOrder[slot_index];
+        if (!sp_slot->attachment) {
+            spSkeletonClipping_clipEnd(sp_clip, sp_slot);
+            continue;
+        }
+
+        // early out if the slot alpha is 0 or the bone is not active
+        // FIXME: does alpha 0 actually mean 'invisible' for all blend modes?
+        if ((sp_slot->color.a == 0) || (!sp_slot->bone->active)) {
+            spSkeletonClipping_clipEnd(sp_clip, sp_slot);
+            continue;
+        }
+
+        int num_vertices = 0;
+        float* uvs = 0;
+        float* vertices = 0;
+        int num_indices = 0;
+        const uint16_t* indices = 0;
+        const spColor* att_color = 0;
+        sg_image img = { SG_INVALID_ID };
+        bool premul_alpha = false;
+        if (sp_slot->attachment->type == SP_ATTACHMENT_REGION) {
+            static const uint16_t quad_indices[] = { 0, 1, 2, 2, 3, 0 };
+            spRegionAttachment* region = (spRegionAttachment*)sp_slot->attachment;
+            att_color = &region->color;
+            // FIXME(?) early out if the slot alpha is 0
+            if (att_color->a == 0) {
+                spSkeletonClipping_clipEnd(sp_clip, sp_slot);
+                continue;
+            }
+            spRegionAttachment_computeWorldVertices(region, sp_slot, tform_buf, 0, tform_buf_stride);
+            vertices = tform_buf;
+            num_vertices = 4;
+            indices = &quad_indices[0];
+            num_indices = 6;
+            uvs = region->uvs;
+            const spAtlasPage* sp_page = ((spAtlasRegion*)region->rendererObject)->page;
+            img.id = (uint32_t)(uintptr_t)sp_page->rendererObject;
+            premul_alpha = sp_page->pma != 0;
+        }
+        else if (sp_slot->attachment->type == SP_ATTACHMENT_MESH) {
+            spMeshAttachment* mesh = (spMeshAttachment*)sp_slot->attachment;
+            att_color = &mesh->color;
+            // FIXME(?) early out if the slot alpha is 0
+            if (att_color->a == 0) {
+                spSkeletonClipping_clipEnd(sp_clip, sp_slot);
+                continue;
+            }
+
+            const int num_floats = mesh->super.worldVerticesLength;
+            num_vertices = num_floats / 2;
+            SOKOL_ASSERT(num_vertices <= max_tform_buf_verts);
+            spVertexAttachment_computeWorldVertices(&mesh->super, sp_slot, 0, num_floats, tform_buf, 0, tform_buf_stride);
+            vertices = tform_buf;
+            indices = mesh->triangles;
+            num_indices = mesh->trianglesCount; // actually indicesCount???
+            uvs = mesh->uvs;
+            const spAtlasPage* sp_page = ((spAtlasRegion*)mesh->rendererObject)->page;
+            img.id = (uint32_t)(uintptr_t)sp_page->rendererObject;
+            premul_alpha = sp_page->pma != 0;
+        }
+        else if (sp_slot->attachment->type == SP_ATTACHMENT_CLIPPING) {
+            spClippingAttachment* clip_attachment = (spClippingAttachment*) sp_slot->attachment;
+            spSkeletonClipping_clipStart(sp_clip, sp_slot, clip_attachment);
+            continue;
+        }
+        else {
+            spSkeletonClipping_clipEnd(sp_clip, sp_slot);
+            continue;
+        }
+        SOKOL_ASSERT(vertices && (num_vertices > 0));
+        SOKOL_ASSERT(indices && (num_indices > 0));
+        SOKOL_ASSERT(uvs);
+        SOKOL_ASSERT(img.id != SG_INVALID_ID);
+
+        if (spSkeletonClipping_isClipping(sp_clip)) {
+            spSkeletonClipping_clipTriangles(sp_clip, tform_buf, num_vertices * 2, (uint16_t*)indices, num_indices, uvs, tform_buf_stride);
+            vertices = sp_clip->clippedVertices->items;
+            num_vertices = sp_clip->clippedVertices->size / 2;
+            uvs = sp_clip->clippedUVs->items;
+            indices = sp_clip->clippedTriangles->items;
+            num_indices = sp_clip->clippedTriangles->size;
+        }
+        SOKOL_ASSERT(vertices);
+        SOKOL_ASSERT(indices);
+        SOKOL_ASSERT(uvs);
+        SOKOL_ASSERT(img.id != SG_INVALID_ID);
+
+        // there might be no geometry to render after clipping
+        if ((0 == num_vertices) || (0 == num_indices)) {
+            spSkeletonClipping_clipEnd(sp_clip, sp_slot);
+            continue;
+        }
+
+        const _sspine_alloc_vertices_result_t dst_vertices = _sspine_alloc_vertices(ctx, num_vertices);
+        const _sspine_alloc_indices_result_t dst_indices = _sspine_alloc_indices(ctx, num_indices);
+        if ((0 == dst_vertices.ptr) || (0 == dst_indices.ptr)) {
+            spSkeletonClipping_clipEnd(sp_clip, sp_slot);
+            continue;
+        }
+
+        // write transformed and potentially clipped vertices and indices
+        const uint8_t r = (uint8_t)(sp_skel->color.r * sp_slot->color.r * att_color->r * 255.0f);
+        const uint8_t g = (uint8_t)(sp_skel->color.g * sp_slot->color.g * att_color->g * 255.0f);
+        const uint8_t b = (uint8_t)(sp_skel->color.b * sp_slot->color.b * att_color->b * 255.0f);
+        const uint8_t a = (uint8_t)(sp_skel->color.a * sp_slot->color.a * att_color->a * 255.0f);
+        const uint32_t color = (((uint32_t)a<<24) | ((uint32_t)b<<16) | ((uint32_t)g<<8) | (uint32_t)r);
+        for (int vi = 0; vi < num_vertices; vi++) {
+            dst_vertices.ptr[vi].pos.x = vertices[vi*2];
+            dst_vertices.ptr[vi].pos.y = vertices[vi*2 + 1];
+            dst_vertices.ptr[vi].color = color;
+            dst_vertices.ptr[vi].uv.x  = uvs[vi*2];
+            dst_vertices.ptr[vi].uv.y  = uvs[vi*2 + 1];
+        }
+        for (int ii = 0; ii < num_indices; ii++) {
+            dst_indices.ptr[ii] = (uint32_t)indices[ii] + (uint32_t)dst_vertices.index;
+        }
+
+        sg_pipeline pip = { SG_INVALID_ID };
+        // NOTE: pma == 0.0: use color from texture as is
+        //       pma == 1.0: multiply texture rgb by texture alpha in fragment shader
+        float pma = 0.0f;
+        switch (sp_slot->data->blendMode) {
+            case SP_BLEND_MODE_NORMAL:
+            case SP_BLEND_MODE_ADDITIVE:
+            case SP_BLEND_MODE_SCREEN:
+                pip = ctx->pip.normal_additive;
+                pma = premul_alpha ? 0.0f : 1.0f;   // NOT A BUG
+                break;
+            case SP_BLEND_MODE_MULTIPLY:
+                pip = ctx->pip.multiply;
+                pma = 0.0f;     // always use texture color as is
+                break;
+        }
+
+        // write new draw command, or merge with previous draw command
+        _sspine_command_t* prev_cmd = _sspine_prev_command(ctx);
+        if (prev_cmd && (prev_cmd->layer == layer) && (prev_cmd->pip.id == pip.id) && (prev_cmd->img.id == img.id) && (prev_cmd->pma == pma)) {
+            // merge with previous command
+            prev_cmd->num_elements += num_indices;
+        }
+        else {
+            // record a new command
+            _sspine_command_t* cmd_ptr = _sspine_next_command(ctx);
+            if (cmd_ptr) {
+                cmd_ptr->layer = layer;
+                cmd_ptr->pip = pip;
+                cmd_ptr->img = img;
+                cmd_ptr->pma = pma;
+                cmd_ptr->base_element = dst_indices.index;
+                cmd_ptr->num_elements = num_indices;
+            }
+        }
+        spSkeletonClipping_clipEnd(sp_clip, sp_slot);
+    }
+    spSkeletonClipping_clipEnd2(sp_clip);
+}
+
+// compute orthographic projection matrix
+static void _sspine_layer_transform_to_proj(const sspine_layer_transform* tform, float* res) {
+    const float left   = -tform->origin.x;
+    const float right  = tform->size.x - tform->origin.x;
+    const float top    = -tform->origin.y;
+    const float bottom = tform->size.y - tform->origin.y;
+    const float znear  = -1.0f;
+    const float zfar   = 1.0f;
+    res[0]  = 2.0f / (right - left);
+    res[1]  = 0.0f;
+    res[2]  = 0.0f;
+    res[3]  = 0.0f;
+    res[4]  = 0.0f;
+    res[5]  = 2.0f / (top - bottom);
+    res[6]  = 0.0f;
+    res[7]  = 0.0f;
+    res[8]  = 0.0f;
+    res[9]  = 0.0f;
+    res[10] = -2.0f / (zfar - znear);
+    res[11] = 0.0f;
+    res[12] = -(right + left) / (right - left);
+    res[13] = -(top + bottom) / (top - bottom);
+    res[14] = -(zfar + znear) / (zfar - znear);
+    res[15] = 1.0f;
+}
+
+static _sspine_vsparams_t _sspine_compute_vsparams(const sspine_layer_transform* tform) {
+    _sspine_vsparams_t p;
+    _sspine_clear(&p, sizeof(p));
+    _sspine_layer_transform_to_proj(tform, p.mvp);
+    return p;
+}
+
+static void _sspine_draw_layer(_sspine_context_t* ctx, int layer, const sspine_layer_transform* tform) {
+    if ((ctx->vertices.cur > 0) && (ctx->commands.cur > 0)) {
+        sg_push_debug_group("sokol-spine");
+
+        if (ctx->update_frame_count != _sspine.frame_count) {
+            ctx->update_frame_count = _sspine.frame_count;
+            const sg_range vtx_range = { ctx->vertices.ptr, (size_t)ctx->vertices.cur * sizeof(_sspine_vertex_t) };
+            sg_update_buffer(ctx->vbuf, &vtx_range);
+            const sg_range idx_range = { ctx->indices.ptr, (size_t)ctx->indices.cur * sizeof(uint32_t) };
+            sg_update_buffer(ctx->ibuf, &idx_range);
+        }
+
+        _sspine_vsparams_t vsparams = _sspine_compute_vsparams(tform);
+        const sg_range vsparams_range = { &vsparams, sizeof(vsparams) };
+        _sspine_fsparams_t fsparams;
+        _sspine_clear(&fsparams, sizeof(fsparams));
+        const sg_range fsparams_range = { &fsparams, sizeof(fsparams) };
+
+        uint32_t cur_pip_id = SG_INVALID_ID;
+        uint32_t cur_img_id = SG_INVALID_ID;
+        float cur_pma = -1.0f;
+        for (int i = 0; i < ctx->commands.cur; i++) {
+            const _sspine_command_t* cmd = &ctx->commands.ptr[i];
+            if ((layer == cmd->layer) && (sg_query_image_state(cmd->img) == SG_RESOURCESTATE_VALID)) {
+                if (cur_pip_id != cmd->pip.id) {
+                    sg_apply_pipeline(cmd->pip);
+                    cur_pip_id = cmd->pip.id;
+                    sg_apply_uniforms(SG_SHADERSTAGE_VS, 0, &vsparams_range);
+                    cur_img_id = SG_INVALID_ID;
+                }
+                if (cur_img_id != cmd->img.id) {
+                    ctx->bind.fs_images[0] = cmd->img;
+                    sg_apply_bindings(&ctx->bind);
+                    cur_img_id = cmd->img.id;
+                }
+                if (cur_pma != cmd->pma) {
+                    fsparams.pma = cmd->pma;
+                    sg_apply_uniforms(SG_SHADERSTAGE_FS, 0, &fsparams_range);
+                    cur_pma = cmd->pma;
+                }
+                if (cmd->num_elements > 0) {
+                    sg_draw(cmd->base_element, cmd->num_elements, 1);
+                }
+            }
+        }
+        sg_pop_debug_group();
+    }
+}
+
+static void _sspine_init_shared(void) {
+    sg_shader_desc shd_desc;
+    _sspine_clear(&shd_desc, sizeof(shd_desc));
+    shd_desc.attrs[0].name = "position";
+    shd_desc.attrs[1].name = "texcoord0";
+    shd_desc.attrs[2].name = "color0";
+    shd_desc.attrs[0].sem_name = "TEXCOORD";
+    shd_desc.attrs[0].sem_index = 0;
+    shd_desc.attrs[1].sem_name = "TEXCOORD";
+    shd_desc.attrs[1].sem_index = 1;
+    shd_desc.attrs[2].sem_name = "TEXCOORD";
+    shd_desc.attrs[2].sem_index = 2;
+    shd_desc.vs.uniform_blocks[0].size = sizeof(_sspine_vsparams_t);
+    shd_desc.vs.uniform_blocks[0].layout = SG_UNIFORMLAYOUT_STD140;
+    shd_desc.vs.uniform_blocks[0].uniforms[0].name = "vs_params";
+    shd_desc.vs.uniform_blocks[0].uniforms[0].type = SG_UNIFORMTYPE_FLOAT4;
+    shd_desc.vs.uniform_blocks[0].uniforms[0].array_count = 4;
+    shd_desc.fs.uniform_blocks[0].size = 16;
+    shd_desc.fs.uniform_blocks[0].layout = SG_UNIFORMLAYOUT_STD140;
+    shd_desc.fs.uniform_blocks[0].uniforms[0].name = "fs_params";
+    shd_desc.fs.uniform_blocks[0].uniforms[0].type = SG_UNIFORMTYPE_FLOAT4;
+    shd_desc.fs.uniform_blocks[0].uniforms[0].array_count = 1;
+    shd_desc.fs.images[0].name = "tex";
+    shd_desc.fs.images[0].image_type = SG_IMAGETYPE_2D;
+    shd_desc.fs.images[0].sampler_type = SG_SAMPLERTYPE_FLOAT;
+    shd_desc.label = "sspine-shader";
+    #if defined(SOKOL_GLCORE33)
+        shd_desc.vs.source = _sspine_vs_source_glsl330;
+        shd_desc.fs.source = _sspine_fs_source_glsl330;
+    #elif defined(SOKOL_GLES2) || defined(SOKOL_GLES3)
+        shd_desc.vs.source = _sspine_vs_source_glsl100;
+        shd_desc.fs.source = _sspine_fs_source_glsl100;
+    #elif defined(SOKOL_METAL)
+        shd_desc.vs.entry = "main0";
+        shd_desc.fs.entry = "main0";
+        switch (sg_query_backend()) {
+            case SG_BACKEND_METAL_MACOS:
+                shd_desc.vs.bytecode = SG_RANGE(_sspine_vs_bytecode_metal_macos);
+                shd_desc.fs.bytecode = SG_RANGE(_sspine_fs_bytecode_metal_macos);
+                break;
+            case SG_BACKEND_METAL_IOS:
+                //FIXME
+                //shd_desc.vs.bytecode = SG_RANGE(_sspine_vs_bytecode_metal_ios);
+                //shd_desc.fs.bytecode = SG_RANGE(_sspine_fs_bytecode_metal_ios);
+                break;
+            default:
+                // FIXME
+                //shd_desc.vs.source = _sspine_vs_source_metal_sim;
+                //shd_desc.fs.source = _sspine_fs_source_metal_sim;
+                break;
+        }
+    #elif defined(SOKOL_D3D11)
+        shd_desc.vs.bytecode = SG_RANGE(_sspine_vs_bytecode_hlsl4);
+        shd_desc.fs.bytecode = SG_RANGE(_sspine_fs_bytecode_hlsl4);
+    #elif defined(SOKOL_WGPU)
+        shd_desc.vs.bytecode = SG_RANGE(_sspine_vs_bytecode_wgpu);
+        shd_desc.fs.bytecode = SG_RANGE(_sspine_fs_bytecode_wgpu);
+    #else
+        shd_desc.vs.source = _sspine_vs_source_dummy;
+        shd_desc.fs.source = _sspine_fs_source_dummy;
+    #endif
+    _sspine.shd = sg_make_shader(&shd_desc);
+}
+
+static void _sspine_destroy_shared(void) {
+    sg_destroy_shader(_sspine.shd);
+}
+
+//== PUBLIC FUNCTIONS ==========================================================
+
+SOKOL_API_IMPL void sspine_setup(const sspine_desc* desc) {
+    SOKOL_ASSERT(desc);
+    spBone_setYDown(1);
+    _sspine_clear(&_sspine, sizeof(_sspine));
+    _sspine.init_cookie = _SSPINE_INIT_COOKIE;
+    _sspine.desc = _sspine_desc_defaults(desc);
+    _sspine_init_shared();
+    _sspine_setup_context_pool(_sspine.desc.context_pool_size);
+    _sspine_setup_atlas_pool(_sspine.desc.atlas_pool_size);
+    _sspine_setup_skeleton_pool(_sspine.desc.skeleton_pool_size);
+    _sspine_setup_skinset_pool(_sspine.desc.skinset_pool_size);
+    _sspine_setup_instance_pool(_sspine.desc.instance_pool_size);
+    const sspine_context_desc ctx_desc = _sspine_as_context_desc(&_sspine.desc);
+    _sspine.def_ctx_id = sspine_make_context(&ctx_desc);
+    SOKOL_ASSERT(_sspine_is_default_context(_sspine.def_ctx_id));
+    sspine_set_context(_sspine.def_ctx_id);
+}
+
+SOKOL_API_IMPL void sspine_shutdown(void) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_destroy_all_instances();
+    _sspine_destroy_all_skinsets();
+    _sspine_destroy_all_skeletons();
+    _sspine_destroy_all_atlases();
+    _sspine_destroy_all_contexts();
+    _sspine_discard_instance_pool();
+    _sspine_discard_skinset_pool();
+    _sspine_discard_skeleton_pool();
+    _sspine_discard_atlas_pool();
+    _sspine_discard_context_pool();
+    _sspine_destroy_shared();
+    _sspine.init_cookie = 0;
+}
+
+SOKOL_API_IMPL sspine_context sspine_make_context(const sspine_context_desc* desc) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    SOKOL_ASSERT(desc);
+    const sspine_context_desc desc_def = _sspine_context_desc_defaults(desc);
+    sspine_context ctx_id = _sspine_alloc_context();
+    _sspine_context_t* ctx = _sspine_lookup_context(ctx_id.id);
+    if (ctx) {
+        ctx->slot.state = _sspine_init_context(ctx, &desc_def);
+        SOKOL_ASSERT((ctx->slot.state == SSPINE_RESOURCESTATE_VALID) || (ctx->slot.state == SSPINE_RESOURCESTATE_FAILED));
+        if (ctx->slot.state == SSPINE_RESOURCESTATE_FAILED) {
+            _sspine_deinit_context(ctx);
+        }
+    }
+    else {
+        ctx->slot.state = SSPINE_RESOURCESTATE_FAILED;
+        _SSPINE_ERROR(CONTEXT_POOL_EXHAUSTED);
+    }
+    return ctx_id;
+}
+
+SOKOL_API_IMPL void sspine_destroy_context(sspine_context ctx_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    if (_sspine_is_default_context(ctx_id)) {
+        _SSPINE_ERROR(CANNOT_DESTROY_DEFAULT_CONTEXT);
+        return;
+    }
+    _sspine_destroy_context(ctx_id);
+    // re-validate the current context pointer (this will return a nullptr
+    // if we just destroyed the current context)
+    _sspine.cur_ctx = _sspine_lookup_context(_sspine.cur_ctx_id.id);
+}
+
+SOKOL_API_IMPL void sspine_set_context(sspine_context ctx_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    if (_sspine_is_default_context(ctx_id)) {
+        _sspine.cur_ctx_id = _sspine.def_ctx_id;
+    }
+    else {
+        _sspine.cur_ctx_id = ctx_id;
+    }
+    // this will return null if the handle isn't valid
+    _sspine.cur_ctx = _sspine_lookup_context(_sspine.cur_ctx_id.id);
+}
+
+SOKOL_API_IMPL sspine_context sspine_get_context(void) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    return _sspine.cur_ctx_id;
+}
+
+SOKOL_API_IMPL sspine_context sspine_default_context(void) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    return _sspine_make_context_handle(0x00010001);
+}
+
+SOKOL_API_IMPL sspine_context_info sspine_get_context_info(sspine_context ctx_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    sspine_context_info res;
+    _sspine_clear(&res, sizeof(res));
+    const _sspine_context_t* ctx = _sspine_lookup_context(ctx_id.id);
+    if (ctx) {
+        res.num_vertices = ctx->vertices.cur;
+        res.num_indices  = ctx->indices.cur;
+        res.num_commands = ctx->commands.cur;
+    }
+    return res;
+}
+
+SOKOL_API_IMPL void sspine_new_frame(void) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine.frame_count++;
+}
+
+SOKOL_API_IMPL void sspine_set_skinset(sspine_instance instance_id, sspine_skinset skinset_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+    _sspine_skinset_t* skinset = _sspine_lookup_skinset(skinset_id.id);
+    if (_sspine_instance_and_deps_valid(instance) && _sspine_skinset_and_deps_valid(skinset) && (instance->skel.id == skinset->skel.id)) {
+        SOKOL_ASSERT(instance->sp_skel);
+        SOKOL_ASSERT(instance->sp_anim_state);
+        SOKOL_ASSERT(skinset->sp_skin);
+        spSkeleton_setSkin(instance->sp_skel, 0);
+        spSkeleton_setSkin(instance->sp_skel, skinset->sp_skin);
+        spSkeleton_setSlotsToSetupPose(instance->sp_skel);
+        spAnimationState_apply(instance->sp_anim_state, instance->sp_skel);
+    }
+}
+
+SOKOL_API_IMPL void sspine_update_instance(sspine_instance instance_id, float delta_time) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+    if (_sspine_instance_and_deps_valid(instance)) {
+        SOKOL_ASSERT(instance->sp_skel);
+        SOKOL_ASSERT(instance->sp_anim_state);
+        _sspine_rewind_triggered_events(instance);
+        spAnimationState_update(instance->sp_anim_state, delta_time);
+        spAnimationState_apply(instance->sp_anim_state, instance->sp_skel);
+        spSkeleton_updateWorldTransform(instance->sp_skel);
+    }
+}
+
+SOKOL_API_IMPL int sspine_num_triggered_events(sspine_instance instance_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+    if (_sspine_instance_and_deps_valid(instance)) {
+        SOKOL_ASSERT((instance->cur_triggered_event_index >= 0) && (instance->cur_triggered_event_index <= _SSPINE_MAX_TRIGGERED_EVENTS));
+        return instance->cur_triggered_event_index;
+    }
+    return 0;
+}
+
+SOKOL_API_IMPL sspine_triggered_event_info sspine_get_triggered_event_info(sspine_instance instance_id, int triggered_event_index) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+    sspine_triggered_event_info res;
+    _sspine_clear(&res, sizeof(res));
+    if (_sspine_instance_and_deps_valid(instance)) {
+        if ((triggered_event_index >= 0) && (triggered_event_index < instance->cur_triggered_event_index)) {
+            res = instance->triggered_events[triggered_event_index];
+        }
+    }
+    return res;
+}
+
+SOKOL_API_IMPL void sspine_draw_instance_in_layer(sspine_instance instance_id, int layer) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_context_t* ctx = _sspine.cur_ctx;
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+    if (ctx && _sspine_instance_and_deps_valid(instance)) {
+        _sspine_draw_instance(ctx, instance, layer);
+    }
+}
+
+SOKOL_API_IMPL sspine_mat4 sspine_layer_transform_to_mat4(const sspine_layer_transform* tform) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    sspine_mat4 res;
+    _sspine_layer_transform_to_proj(tform, res.m);
+    return res;
+}
+
+SOKOL_API_IMPL void sspine_context_draw_instance_in_layer(sspine_context ctx_id, sspine_instance instance_id, int layer) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_context_t* ctx = _sspine_lookup_context(ctx_id.id);
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+    if (ctx && _sspine_instance_and_deps_valid(instance)) {
+        _sspine_draw_instance(ctx, instance, layer);
+    }
+}
+
+SOKOL_API_IMPL void sspine_draw_layer(int layer, const sspine_layer_transform* tform) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    SOKOL_ASSERT(tform);
+    _sspine_context_t* ctx = _sspine.cur_ctx;
+    if (ctx) {
+        _sspine_draw_layer(ctx, layer, tform);
+    }
+}
+
+SOKOL_API_IMPL void sspine_context_draw_layer(sspine_context ctx_id, int layer, const sspine_layer_transform* tform) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    SOKOL_ASSERT(tform);
+    _sspine_context_t* ctx = _sspine_lookup_context(ctx_id.id);
+    if (ctx) {
+        _sspine_draw_layer(ctx, layer, tform);
+    }
+}
+
+SOKOL_API_IMPL sspine_atlas sspine_make_atlas(const sspine_atlas_desc* desc) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    SOKOL_ASSERT(desc);
+    const sspine_atlas_desc desc_def = _sspine_atlas_desc_defaults(desc);
+    sspine_atlas atlas_id = _sspine_alloc_atlas();
+    _sspine_atlas_t* atlas = _sspine_lookup_atlas(atlas_id.id);
+    if (atlas) {
+        atlas->slot.state = _sspine_init_atlas(atlas, &desc_def);
+        SOKOL_ASSERT((atlas->slot.state == SSPINE_RESOURCESTATE_VALID) || (atlas->slot.state == SSPINE_RESOURCESTATE_FAILED));
+        if (atlas->slot.state == SSPINE_RESOURCESTATE_FAILED) {
+            _sspine_deinit_atlas(atlas);
+        }
+    }
+    else {
+        _SSPINE_ERROR(ATLAS_POOL_EXHAUSTED);
+    }
+    return atlas_id;
+}
+
+SOKOL_API_IMPL void sspine_destroy_atlas(sspine_atlas atlas_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_destroy_atlas(atlas_id);
+}
+
+SOKOL_API_IMPL sspine_skeleton sspine_make_skeleton(const sspine_skeleton_desc* desc) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    SOKOL_ASSERT(desc);
+    const sspine_skeleton_desc desc_def = _sspine_skeleton_desc_defaults(desc);
+    sspine_skeleton skeleton_id = _sspine_alloc_skeleton();
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id.id);
+    if (skeleton) {
+        skeleton->slot.state = _sspine_init_skeleton(skeleton, &desc_def);
+        SOKOL_ASSERT((skeleton->slot.state == SSPINE_RESOURCESTATE_VALID) || (skeleton->slot.state == SSPINE_RESOURCESTATE_FAILED));
+        if (skeleton->slot.state == SSPINE_RESOURCESTATE_FAILED) {
+            _sspine_deinit_skeleton(skeleton);
+        }
+    }
+    else {
+        _SSPINE_ERROR(SKELETON_POOL_EXHAUSTED);
+    }
+    return skeleton_id;
+}
+
+SOKOL_API_IMPL void sspine_destroy_skeleton(sspine_skeleton skeleton_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_destroy_skeleton(skeleton_id);
+}
+
+SOKOL_API_IMPL sspine_skinset sspine_make_skinset(const sspine_skinset_desc* desc) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    SOKOL_ASSERT(desc);
+    const sspine_skinset_desc desc_def = _sspine_skinset_desc_defaults(desc);
+    sspine_skinset skinset_id = _sspine_alloc_skinset();
+    _sspine_skinset_t* skinset = _sspine_lookup_skinset(skinset_id.id);
+    if (skinset) {
+        skinset->slot.state = _sspine_init_skinset(skinset, &desc_def);
+        SOKOL_ASSERT((skinset->slot.state == SSPINE_RESOURCESTATE_VALID) || (skinset->slot.state == SSPINE_RESOURCESTATE_FAILED));
+        if (skinset->slot.state == SSPINE_RESOURCESTATE_FAILED) {
+            _sspine_deinit_skinset(skinset);
+        }
+    }
+    else {
+        _SSPINE_ERROR(SKINSET_POOL_EXHAUSTED);
+    }
+    return skinset_id;
+}
+
+SOKOL_API_IMPL void sspine_destroy_skinset(sspine_skinset skinset_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_destroy_skinset(skinset_id);
+}
+
+SOKOL_API_IMPL sspine_instance sspine_make_instance(const sspine_instance_desc* desc) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    SOKOL_ASSERT(desc);
+    const sspine_instance_desc desc_def = _sspine_instance_desc_defaults(desc);
+    sspine_instance instance_id = _sspine_alloc_instance();
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+    if (instance) {
+        instance->slot.state = _sspine_init_instance(instance, &desc_def);
+        SOKOL_ASSERT((instance->slot.state == SSPINE_RESOURCESTATE_VALID) || (instance->slot.state == SSPINE_RESOURCESTATE_FAILED));
+        if (instance->slot.state == SSPINE_RESOURCESTATE_FAILED) {
+            _sspine_deinit_instance(instance);
+        }
+    }
+    else {
+        _SSPINE_ERROR(INSTANCE_POOL_EXHAUSTED);
+    }
+    return instance_id;
+}
+
+SOKOL_API_IMPL void sspine_destroy_instance(sspine_instance instance_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_destroy_instance(instance_id);
+}
+
+SOKOL_API_IMPL sspine_resource_state sspine_get_context_resource_state(sspine_context ctx_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    const _sspine_context_t* ctx = _sspine_lookup_context(ctx_id.id);
+    if (ctx) {
+        return ctx->slot.state;
+    }
+    else {
+        return SSPINE_RESOURCESTATE_INVALID;
+    }
+}
+
+SOKOL_API_IMPL sspine_resource_state sspine_get_atlas_resource_state(sspine_atlas atlas_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    const _sspine_atlas_t* atlas = _sspine_lookup_atlas(atlas_id.id);
+    if (atlas) {
+        return atlas->slot.state;
+    }
+    else {
+        return SSPINE_RESOURCESTATE_INVALID;
+    }
+}
+
+SOKOL_API_IMPL sspine_resource_state sspine_get_skeleton_resource_state(sspine_skeleton skeleton_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    const _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id.id);
+    if (skeleton) {
+        return skeleton->slot.state;
+    }
+    else {
+        return SSPINE_RESOURCESTATE_INVALID;
+    }
+}
+
+SOKOL_API_IMPL sspine_resource_state sspine_get_skinset_resource_state(sspine_skinset skinset_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    const _sspine_skinset_t* skinset = _sspine_lookup_skinset(skinset_id.id);
+    if (skinset) {
+        return skinset->slot.state;
+    }
+    else {
+        return SSPINE_RESOURCESTATE_INVALID;
+    }
+}
+
+SOKOL_API_IMPL sspine_resource_state sspine_get_instance_resource_state(sspine_instance instance_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    const _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+    if (instance) {
+        return instance->slot.state;
+    }
+    else {
+        return SSPINE_RESOURCESTATE_INVALID;
+    }
+}
+
+SOKOL_API_IMPL bool sspine_context_valid(sspine_context ctx_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    return sspine_get_context_resource_state(ctx_id) == SSPINE_RESOURCESTATE_VALID;
+}
+
+SOKOL_API_IMPL bool sspine_atlas_valid(sspine_atlas atlas_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    return sspine_get_atlas_resource_state(atlas_id) == SSPINE_RESOURCESTATE_VALID;
+}
+
+SOKOL_API_IMPL bool sspine_skeleton_valid(sspine_skeleton skeleton_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    return sspine_get_skeleton_resource_state(skeleton_id) == SSPINE_RESOURCESTATE_VALID;
+}
+
+SOKOL_API_IMPL bool sspine_skinset_valid(sspine_skinset skinset_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    return sspine_get_skinset_resource_state(skinset_id) == SSPINE_RESOURCESTATE_VALID;
+}
+
+SOKOL_API_IMPL bool sspine_instance_valid(sspine_instance instance_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    return sspine_get_instance_resource_state(instance_id) == SSPINE_RESOURCESTATE_VALID;
+}
+
+SOKOL_API_IMPL sspine_atlas sspine_get_skeleton_atlas(sspine_skeleton skeleton_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id.id);
+    sspine_atlas res;
+    _sspine_clear(&res, sizeof(res));
+    if (skeleton) {
+        res.id = skeleton->atlas.id;
+    }
+    return res;
+}
+
+SOKOL_API_IMPL sspine_skeleton sspine_get_instance_skeleton(sspine_instance instance_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+    sspine_skeleton res;
+    _sspine_clear(&res, sizeof(res));
+    if (instance) {
+        res.id = instance->skel.id;
+    }
+    return res;
+}
+
+SOKOL_API_IMPL int sspine_num_images(sspine_atlas atlas_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_atlas_t* atlas = _sspine_lookup_atlas(atlas_id.id);
+    if (atlas) {
+        return atlas->num_pages;
+    }
+    return 0;
+}
+
+SOKOL_API_IMPL sspine_image sspine_image_by_index(sspine_atlas atlas_id, int index) {
+    return _sspine_image(atlas_id.id, index);
+}
+
+SOKOL_API_IMPL bool sspine_image_valid(sspine_image image) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_atlas_t* atlas = _sspine_lookup_atlas(image.atlas_id);
+    return atlas && (image.index >= 0) && (image.index < atlas->num_pages);
+}
+
+SOKOL_API_IMPL bool sspine_image_equal(sspine_image first, sspine_image second) {
+    return (first.atlas_id == second.atlas_id) && (first.index == second.index);
+}
+
+SOKOL_API_IMPL sspine_image_info sspine_get_image_info(sspine_image image) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_atlas_t* atlas = _sspine_lookup_atlas(image.atlas_id);
+    sspine_image_info img_info;
+    _sspine_clear(&img_info, sizeof(img_info));
+    if (atlas && (image.index >= 0) && (image.index < atlas->num_pages)) {
+        _sspine_init_image_info(atlas, image.index, &img_info, true);
+    }
+    return img_info;
+}
+
+SOKOL_API_IMPL int sspine_num_atlas_pages(sspine_atlas atlas_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_atlas_t* atlas = _sspine_lookup_atlas(atlas_id.id);
+    if (atlas) {
+        return atlas->num_pages;
+    }
+    else {
+        return 0;
+    }
+}
+
+SOKOL_API_IMPL sspine_atlas_page sspine_atlas_page_by_index(sspine_atlas atlas_id, int index) {
+    return _sspine_atlas_page(atlas_id.id, index);
+}
+
+SOKOL_API_IMPL bool sspine_atlas_page_valid(sspine_atlas_page page) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_atlas_t* atlas = _sspine_lookup_atlas(page.atlas_id);
+    if (atlas) {
+        return (page.index >= 0) && (page.index < atlas->num_pages);
+    }
+    return false;
+}
+
+SOKOL_API_IMPL bool sspine_atlas_page_equal(sspine_atlas_page first, sspine_atlas_page second) {
+    return (first.atlas_id == second.atlas_id) && (first.index == second.index);
+}
+
+SOKOL_API_IMPL sspine_atlas_page_info sspine_get_atlas_page_info(sspine_atlas_page page) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    sspine_atlas_page_info res;
+    _sspine_clear(&res, sizeof(res));
+    const spAtlasPage* sp_page = _sspine_lookup_atlas_page(page.atlas_id, page.index);
+    if (sp_page) {
+        // at this point, atlas is guaranteed to be valid
+        const _sspine_atlas_t* atlas = _sspine_lookup_atlas(page.atlas_id);
+        res.valid = true;
+        res.atlas.id = page.atlas_id;
+        // write image info without overrides
+        _sspine_init_image_info(atlas, page.index, &res.image, false);
+        // ...and provide the overrides separately
+        res.overrides = atlas->overrides;
+    }
+    return res;
+}
+
+SOKOL_API_IMPL void sspine_set_position(sspine_instance instance_id, sspine_vec2 position) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+    if (_sspine_instance_and_deps_valid(instance)) {
+        SOKOL_ASSERT(instance->sp_skel);
+        instance->sp_skel->x = position.x;
+        instance->sp_skel->y = position.y;
+    }
+}
+
+SOKOL_API_IMPL void sspine_set_scale(sspine_instance instance_id, sspine_vec2 scale) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+    if (instance) {
+        SOKOL_ASSERT(instance->sp_skel);
+        instance->sp_skel->scaleX = scale.x;
+        instance->sp_skel->scaleY = scale.y;
+    }
+}
+
+SOKOL_API_IMPL void sspine_set_color(sspine_instance instance_id, sspine_color color) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+    if (instance) {
+        SOKOL_ASSERT(instance->sp_skel);
+        instance->sp_skel->color.r = color.r;
+        instance->sp_skel->color.g = color.g;
+        instance->sp_skel->color.b = color.b;
+        instance->sp_skel->color.a = color.a;
+    }
+}
+
+SOKOL_API_IMPL sspine_vec2 sspine_get_position(sspine_instance instance_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+    sspine_vec2 v = { 0.0f, 0.0f };
+    if (instance) {
+        SOKOL_ASSERT(instance->sp_skel);
+        v.x = instance->sp_skel->x;
+        v.y = instance->sp_skel->y;
+    }
+    return v;
+}
+
+SOKOL_API_IMPL sspine_vec2 sspine_get_scale(sspine_instance instance_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+    sspine_vec2 v = { 0.0f, 0.0f };
+    if (instance) {
+        SOKOL_ASSERT(instance->sp_skel);
+        v.x = instance->sp_skel->scaleX;
+        v.y = instance->sp_skel->scaleY;
+    }
+    return v;
+}
+
+SOKOL_API_IMPL  sspine_color sspine_get_color(sspine_instance instance_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+    sspine_color c = { 0.0f, 0.0f, 0.0f, 0.0f };
+    if (instance) {
+        SOKOL_ASSERT(instance->sp_skel);
+        c.r = instance->sp_skel->color.r;
+        c.g = instance->sp_skel->color.g;
+        c.b = instance->sp_skel->color.b;
+        c.a = instance->sp_skel->color.a;
+    }
+    return c;
+}
+
+SOKOL_API_IMPL int sspine_num_anims(sspine_skeleton skeleton_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id.id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data);
+        return skeleton->sp_skel_data->animationsCount;
+    }
+    return 0;
+}
+
+SOKOL_API_IMPL sspine_anim sspine_anim_by_name(sspine_skeleton skeleton_id, const char* name) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    SOKOL_ASSERT(name);
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id.id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        // NOTE: there's a spSkeletonData_findAnimation function, but that doesn't
+        // give us access to the index, so we'll need to do the loop ourselves
+        SOKOL_ASSERT(skeleton->sp_skel_data);
+        const spSkeletonData* sp_skel_data = skeleton->sp_skel_data;
+        const int num_anims = sp_skel_data->animationsCount;
+        SOKOL_ASSERT(sp_skel_data->animations);
+        for (int i = 0; i < num_anims; i++) {
+            SOKOL_ASSERT(sp_skel_data->animations[i]);
+            SOKOL_ASSERT(sp_skel_data->animations[i]->name);
+            if (0 == strcmp(sp_skel_data->animations[i]->name, name)) {
+                return _sspine_anim(skeleton_id.id, i);
+            }
+        }
+    }
+    return _sspine_anim(0, 0);
+}
+
+SOKOL_API_IMPL sspine_anim sspine_anim_by_index(sspine_skeleton skeleton_id, int index) {
+    return _sspine_anim(skeleton_id.id, index);
+}
+
+SOKOL_API_IMPL bool sspine_anim_valid(sspine_anim anim) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(anim.skeleton_id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data);
+        return (anim.index >= 0) && (anim.index < skeleton->sp_skel_data->animationsCount);
+    }
+    return false;
+}
+
+SOKOL_API_IMPL bool sspine_anim_equal(sspine_anim first, sspine_anim second) {
+    return (first.skeleton_id == second.skeleton_id) && (first.index == second.index);
+}
+
+SOKOL_API_IMPL sspine_anim_info sspine_get_anim_info(sspine_anim anim) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    sspine_anim_info res;
+    _sspine_clear(&res, sizeof(res));
+    const spAnimation* sp_anim = _sspine_lookup_skeleton_anim(anim.skeleton_id, anim.index);
+    if (sp_anim) {
+        res.valid = true;
+        res.index = anim.index;
+        res.duration = sp_anim->duration;
+        res.name = _sspine_string(sp_anim->name);
+        if (res.name.truncated) {
+            _SSPINE_WARN(STRING_TRUNCATED);
+        }
+    }
+    return res;
+}
+
+SOKOL_API_IMPL void sspine_clear_animation_tracks(sspine_instance instance_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+    if (_sspine_instance_and_deps_valid(instance)) {
+        SOKOL_ASSERT(instance->sp_anim_state);
+        spAnimationState_clearTracks(instance->sp_anim_state);
+    }
+}
+
+SOKOL_API_IMPL void sspine_clear_animation_track(sspine_instance instance_id, int track_index) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+    if (_sspine_instance_and_deps_valid(instance)) {
+        SOKOL_ASSERT(instance->sp_anim_state);
+        spAnimationState_clearTrack(instance->sp_anim_state, track_index);
+    }
+}
+
+SOKOL_API_IMPL void sspine_set_animation(sspine_instance instance_id, sspine_anim anim, int track_index, bool loop) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    spAnimation* sp_anim = _sspine_lookup_instance_anim(instance_id.id, anim.skeleton_id, anim.index);
+    if (sp_anim) {
+        // NOTE: at this point, instance is guaranteed to be valid
+        _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+        SOKOL_ASSERT(instance);
+        spAnimationState_setAnimation(instance->sp_anim_state, track_index, sp_anim, loop?1:0);
+    }
+}
+
+SOKOL_API_IMPL void sspine_add_animation(sspine_instance instance_id, sspine_anim anim, int track_index, bool loop, float delay) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    spAnimation* sp_anim = _sspine_lookup_instance_anim(instance_id.id, anim.skeleton_id, anim.index);
+    if (sp_anim) {
+        // NOTE: at this point, instance is guaranteed to be valid
+        _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+        SOKOL_ASSERT(instance);
+        SOKOL_ASSERT(instance->sp_anim_state);
+        spAnimationState_addAnimation(instance->sp_anim_state, track_index, sp_anim, loop?1:0, delay);
+    }
+}
+
+SOKOL_API_IMPL void sspine_set_empty_animation(sspine_instance instance_id, int track_index, float mix_duration) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+    if (_sspine_instance_and_deps_valid(instance)) {
+        SOKOL_ASSERT(instance->sp_anim_state);
+        spAnimationState_setEmptyAnimation(instance->sp_anim_state, track_index, mix_duration);
+    }
+}
+
+SOKOL_API_IMPL void sspine_add_empty_animation(sspine_instance instance_id, int track_index, float mix_duration, float delay) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+    if (_sspine_instance_and_deps_valid(instance)) {
+        SOKOL_ASSERT(instance->sp_anim_state);
+        spAnimationState_addEmptyAnimation(instance->sp_anim_state, track_index, mix_duration, delay);
+    }
+}
+
+SOKOL_API_IMPL int sspine_num_bones(sspine_skeleton skeleton_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id.id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data);
+        return skeleton->sp_skel_data->bonesCount;
+    }
+    return 0;
+}
+
+SOKOL_API_IMPL sspine_bone sspine_bone_by_name(sspine_skeleton skeleton_id, const char* name) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    SOKOL_ASSERT(name);
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id.id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data);
+        spBoneData* sp_bone_data = spSkeletonData_findBone(skeleton->sp_skel_data, name);
+        if (sp_bone_data) {
+            return _sspine_bone(skeleton_id.id, sp_bone_data->index);
+        }
+    }
+    return _sspine_bone(0, 0);
+}
+
+SOKOL_API_IMPL sspine_bone sspine_bone_by_index(sspine_skeleton skeleton_id, int index) {
+    return _sspine_bone(skeleton_id.id, index);
+}
+
+SOKOL_API_IMPL bool sspine_bone_valid(sspine_bone bone) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(bone.skeleton_id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data);
+        return (bone.index >= 0) && (bone.index < skeleton->sp_skel_data->bonesCount);
+    }
+    return false;
+}
+
+SOKOL_API_IMPL bool sspine_bone_equal(sspine_bone first, sspine_bone second) {
+    return (first.skeleton_id == second.skeleton_id) && (first.index == second.index);
+}
+
+SOKOL_API_IMPL sspine_bone_info sspine_get_bone_info(sspine_bone bone) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    sspine_bone_info res;
+    _sspine_clear(&res, sizeof(res));
+    const spBoneData* sp_bone_data = _sspine_lookup_bone_data(bone.skeleton_id, bone.index);
+    if (sp_bone_data) {
+        SOKOL_ASSERT(sp_bone_data->index == bone.index);
+        SOKOL_ASSERT(sp_bone_data->name);
+        res.valid = true;
+        res.index = sp_bone_data->index;
+        if (sp_bone_data->parent) {
+            res.parent_bone = _sspine_bone(bone.skeleton_id, sp_bone_data->parent->index);
+        }
+        res.length = sp_bone_data->length;
+        res.pose.position.x = sp_bone_data->x;
+        res.pose.position.y = sp_bone_data->y;
+        res.pose.rotation = sp_bone_data->rotation;
+        res.pose.scale.x = sp_bone_data->scaleX;
+        res.pose.scale.y = sp_bone_data->scaleY;
+        res.pose.shear.x = sp_bone_data->shearX;
+        res.pose.shear.y = sp_bone_data->shearY;
+        res.color.r = sp_bone_data->color.r;
+        res.color.g = sp_bone_data->color.g;
+        res.color.b = sp_bone_data->color.b;
+        res.color.a = sp_bone_data->color.a;
+        res.name = _sspine_string(sp_bone_data->name);
+        if (res.name.truncated) {
+            _SSPINE_WARN(STRING_TRUNCATED);
+        }
+    }
+    return res;
+}
+
+SOKOL_API_IMPL void sspine_set_bone_transform(sspine_instance instance_id, sspine_bone bone, const sspine_bone_transform* transform) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    SOKOL_ASSERT(transform);
+    spBone* sp_bone = _sspine_lookup_bone(instance_id.id, bone.skeleton_id, bone.index);
+    if (sp_bone) {
+        sp_bone->x = transform->position.x;
+        sp_bone->y = transform->position.y;
+        sp_bone->rotation = transform->rotation;
+        sp_bone->scaleX = transform->scale.x;
+        sp_bone->scaleY = transform->scale.y;
+        sp_bone->shearX = transform->shear.x;
+        sp_bone->shearY = transform->shear.y;
+    }
+}
+
+SOKOL_API_IMPL void sspine_set_bone_position(sspine_instance instance_id, sspine_bone bone, sspine_vec2 position) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    spBone* sp_bone = _sspine_lookup_bone(instance_id.id, bone.skeleton_id, bone.index);
+    if (sp_bone) {
+        sp_bone->x = position.x;
+        sp_bone->y = position.y;
+    }
+}
+
+SOKOL_API_IMPL void sspine_set_bone_rotation(sspine_instance instance_id, sspine_bone bone, float rotation) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    spBone* sp_bone = _sspine_lookup_bone(instance_id.id, bone.skeleton_id, bone.index);
+    if (sp_bone) {
+        sp_bone->rotation = rotation;
+    }
+}
+
+SOKOL_API_IMPL void sspine_set_bone_scale(sspine_instance instance_id, sspine_bone bone, sspine_vec2 scale) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    spBone* sp_bone = _sspine_lookup_bone(instance_id.id, bone.skeleton_id, bone.index);
+    if (sp_bone) {
+        sp_bone->scaleX = scale.x;
+        sp_bone->scaleY = scale.y;
+    }
+}
+
+SOKOL_API_IMPL void sspine_set_bone_shear(sspine_instance instance_id, sspine_bone bone, sspine_vec2 shear) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    spBone* sp_bone = _sspine_lookup_bone(instance_id.id, bone.skeleton_id, bone.index);
+    if (sp_bone) {
+        sp_bone->shearX = shear.x;
+        sp_bone->shearY = shear.y;
+    }
+}
+
+SOKOL_API_IMPL sspine_bone_transform sspine_get_bone_transform(sspine_instance instance_id, sspine_bone bone) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    sspine_bone_transform res;
+    _sspine_clear(&res, sizeof(res));
+    spBone* sp_bone = _sspine_lookup_bone(instance_id.id, bone.skeleton_id, bone.index);
+    if (sp_bone) {
+        res.position.x = sp_bone->x;
+        res.position.y = sp_bone->y;
+        res.rotation = sp_bone->rotation;
+        res.scale.x = sp_bone->scaleX;
+        res.scale.y = sp_bone->scaleY;
+        res.shear.x = sp_bone->shearX;
+        res.shear.y = sp_bone->shearY;
+    }
+    return res;
+}
+
+SOKOL_API_IMPL sspine_vec2 sspine_get_bone_position(sspine_instance instance_id, sspine_bone bone) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    sspine_vec2 res;
+    _sspine_clear(&res, sizeof(res));
+    spBone* sp_bone = _sspine_lookup_bone(instance_id.id, bone.skeleton_id, bone.index);
+    if (sp_bone) {
+        res.x = sp_bone->x;
+        res.y = sp_bone->y;
+    }
+    return res;
+}
+
+SOKOL_API_IMPL float sspine_get_bone_rotation(sspine_instance instance_id, sspine_bone bone) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    spBone* sp_bone = _sspine_lookup_bone(instance_id.id, bone.skeleton_id, bone.index);
+    if (sp_bone) {
+        return sp_bone->rotation;
+    }
+    else {
+        return 0.0f;
+    }
+}
+
+SOKOL_API_IMPL sspine_vec2 sspine_get_bone_scale(sspine_instance instance_id, sspine_bone bone) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    sspine_vec2 res;
+    _sspine_clear(&res, sizeof(res));
+    spBone* sp_bone = _sspine_lookup_bone(instance_id.id, bone.skeleton_id, bone.index);
+    if (sp_bone) {
+        res.x = sp_bone->scaleX;
+        res.y = sp_bone->scaleY;
+    }
+    return res;
+}
+
+SOKOL_API_IMPL sspine_vec2 sspine_get_bone_shear(sspine_instance instance_id, sspine_bone bone) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    sspine_vec2 res;
+    _sspine_clear(&res, sizeof(res));
+    spBone* sp_bone = _sspine_lookup_bone(instance_id.id, bone.skeleton_id, bone.index);
+    if (sp_bone) {
+        res.x = sp_bone->shearX;
+        res.y = sp_bone->shearY;
+    }
+    return res;
+}
+
+SOKOL_API_IMPL sspine_vec2 sspine_get_bone_world_position(sspine_instance instance_id, sspine_bone bone) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    sspine_vec2 res;
+    _sspine_clear(&res, sizeof(res));
+    spBone* sp_bone = _sspine_lookup_bone(instance_id.id, bone.skeleton_id, bone.index);
+    if (sp_bone) {
+        res.x = sp_bone->worldX;
+        res.y = sp_bone->worldY;
+    }
+    return res;
+}
+
+SOKOL_API_IMPL sspine_vec2 sspine_bone_local_to_world(sspine_instance instance_id, sspine_bone bone, sspine_vec2 local_pos) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    sspine_vec2 res;
+    _sspine_clear(&res, sizeof(res));
+    spBone* sp_bone = _sspine_lookup_bone(instance_id.id, bone.skeleton_id, bone.index);
+    if (sp_bone) {
+        spBone_localToWorld(sp_bone, local_pos.x, local_pos.y, &res.x, &res.y);
+    }
+    return res;
+}
+
+SOKOL_API_IMPL sspine_vec2 sspine_bone_world_to_local(sspine_instance instance_id, sspine_bone bone, sspine_vec2 world_pos) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    sspine_vec2 res;
+    _sspine_clear(&res, sizeof(res));
+    spBone* sp_bone = _sspine_lookup_bone(instance_id.id, bone.skeleton_id, bone.index);
+    if (sp_bone) {
+        spBone_worldToLocal(sp_bone, world_pos.x, world_pos.y, &res.x, &res.y);
+    }
+    return res;
+}
+
+SOKOL_API_IMPL int sspine_num_slots(sspine_skeleton skeleton_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id.id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data);
+        return skeleton->sp_skel_data->slotsCount;
+    }
+    return 0;
+}
+
+SOKOL_API_IMPL sspine_slot sspine_slot_by_name(sspine_skeleton skeleton_id, const char* name) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    SOKOL_ASSERT(name);
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id.id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data);
+        spSlotData* sp_slot_data = spSkeletonData_findSlot(skeleton->sp_skel_data, name);
+        if (sp_slot_data) {
+            return _sspine_slot(skeleton_id.id, sp_slot_data->index);
+        }
+    }
+    return _sspine_slot(0, 0);
+}
+
+SOKOL_API_IMPL sspine_slot sspine_slot_by_index(sspine_skeleton skeleton_id, int index) {
+    return _sspine_slot(skeleton_id.id, index);
+}
+
+SOKOL_API_IMPL bool sspine_slot_valid(sspine_slot slot) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(slot.skeleton_id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data);
+        return (slot.index >= 0) && (slot.index < skeleton->sp_skel_data->slotsCount);
+    }
+    return false;
+}
+
+SOKOL_API_IMPL bool sspine_slot_equal(sspine_slot first, sspine_slot second) {
+    return (first.skeleton_id == second.skeleton_id) && (first.index == second.index);
+}
+
+SOKOL_API_IMPL sspine_slot_info sspine_get_slot_info(sspine_slot slot) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    sspine_slot_info res;
+    _sspine_clear(&res, sizeof(res));
+    const spSlotData* sp_slot_data = _sspine_lookup_slot_data(slot.skeleton_id, slot.index);
+    if (sp_slot_data) {
+        SOKOL_ASSERT(sp_slot_data->index == slot.index);
+        SOKOL_ASSERT(sp_slot_data->name);
+        SOKOL_ASSERT(sp_slot_data->boneData);
+        res.valid = true;
+        res.index = sp_slot_data->index;
+        res.bone = _sspine_bone(slot.skeleton_id, sp_slot_data->boneData->index);
+        res.color.r = sp_slot_data->color.r;
+        res.color.g = sp_slot_data->color.g;
+        res.color.b = sp_slot_data->color.b;
+        res.color.a = sp_slot_data->color.a;
+        res.attachment_name = _sspine_string(sp_slot_data->attachmentName);
+        if (res.attachment_name.truncated) {
+            _SSPINE_WARN(STRING_TRUNCATED);
+        }
+        res.name = _sspine_string(sp_slot_data->name);
+        if (res.name.truncated) {
+            _SSPINE_WARN(STRING_TRUNCATED);
+        }
+    }
+    return res;
+}
+
+SOKOL_API_IMPL void sspine_set_slot_color(sspine_instance instance_id, sspine_slot slot, sspine_color color) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    spSlot* sp_slot = _sspine_lookup_slot(instance_id.id, slot.skeleton_id, slot.index);
+    if (sp_slot) {
+        sp_slot->color.r = color.r;
+        sp_slot->color.g = color.g;
+        sp_slot->color.b = color.b;
+        sp_slot->color.a = color.a;
+    }
+}
+
+SOKOL_API_IMPL sspine_color sspine_get_slot_color(sspine_instance instance_id, sspine_slot slot) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    sspine_color color;
+    _sspine_clear(&color, sizeof(color));
+    spSlot* sp_slot = _sspine_lookup_slot(instance_id.id, slot.skeleton_id, slot.index);
+    if (sp_slot) {
+        color.r = sp_slot->color.r;
+        color.g = sp_slot->color.g;
+        color.b = sp_slot->color.b;
+        color.a = sp_slot->color.a;
+    }
+    return color;
+}
+
+SOKOL_API_IMPL int sspine_num_events(sspine_skeleton skeleton_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id.id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data);
+        return skeleton->sp_skel_data->eventsCount;
+    }
+    return 0;
+}
+
+SOKOL_API_IMPL sspine_event sspine_event_by_name(sspine_skeleton skeleton_id, const char* name) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    SOKOL_ASSERT(name);
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id.id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data);
+        SOKOL_ASSERT(skeleton->sp_skel_data->events);
+        // spEventData has no embedded index, so we need to loop over the events
+        for (int i = 0; i < skeleton->sp_skel_data->eventsCount; i++) {
+            SOKOL_ASSERT(skeleton->sp_skel_data->events[i]);
+            SOKOL_ASSERT(skeleton->sp_skel_data->events[i]->name);
+            if (0 == strcmp(skeleton->sp_skel_data->events[i]->name, name)) {
+                return _sspine_event(skeleton_id.id, i);
+            }
+        }
+    }
+    return _sspine_event(0, 0);
+}
+
+SOKOL_API_IMPL sspine_event sspine_event_by_index(sspine_skeleton skeleton_id, int index) {
+    return _sspine_event(skeleton_id.id, index);
+}
+
+SOKOL_API_IMPL bool sspine_event_valid(sspine_event event) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(event.skeleton_id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data);
+        return (event.index >= 0) && (event.index < skeleton->sp_skel_data->eventsCount);
+    }
+    return false;
+}
+
+SOKOL_API_IMPL bool sspine_event_equal(sspine_event first, sspine_event second) {
+    return (first.skeleton_id == second.skeleton_id) && (first.index == second.index);
+}
+
+SOKOL_API_IMPL sspine_event_info sspine_get_event_info(sspine_event event) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    sspine_event_info res;
+    _sspine_clear(&res, sizeof(res));
+    const spEventData* sp_event_data = _sspine_lookup_event_data(event.skeleton_id, event.index);
+    if (sp_event_data) {
+        res.valid = true;
+        res.index = event.index;
+        res.int_value = sp_event_data->intValue;
+        res.float_value = sp_event_data->floatValue;
+        res.volume = sp_event_data->volume;
+        res.balance = sp_event_data->balance;
+        res.name = _sspine_string(sp_event_data->name);
+        if (res.name.truncated) {
+            _SSPINE_WARN(STRING_TRUNCATED);
+        }
+        res.string_value = _sspine_string(sp_event_data->stringValue);
+        if (res.string_value.truncated) {
+            _SSPINE_WARN(STRING_TRUNCATED);
+        }
+        res.audio_path = _sspine_string(sp_event_data->audioPath);
+        if (res.audio_path.truncated) {
+            _SSPINE_WARN(STRING_TRUNCATED);
+        }
+    }
+    return res;
+}
+
+SOKOL_API_IMPL int sspine_num_iktargets(sspine_skeleton skeleton_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id.id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data);
+        return skeleton->sp_skel_data->ikConstraintsCount;
+    }
+    return 0;
+}
+
+SOKOL_API_IMPL sspine_iktarget sspine_iktarget_by_name(sspine_skeleton skeleton_id, const char* name) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    SOKOL_ASSERT(name);
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id.id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data);
+        SOKOL_ASSERT(skeleton->sp_skel_data->ikConstraints);
+        // spIkConstraintData has no embedded index, so we need to loop over the events
+        for (int i = 0; i < skeleton->sp_skel_data->ikConstraintsCount; i++) {
+            SOKOL_ASSERT(skeleton->sp_skel_data->ikConstraints[i]);
+            SOKOL_ASSERT(skeleton->sp_skel_data->ikConstraints[i]->name);
+            if (0 == strcmp(skeleton->sp_skel_data->ikConstraints[i]->name, name)) {
+                return _sspine_iktarget(skeleton_id.id, i);
+            }
+        }
+    }
+    return _sspine_iktarget(0, 0);
+}
+
+SOKOL_API_IMPL sspine_iktarget sspine_iktarget_by_index(sspine_skeleton skeleton_id, int index) {
+    return _sspine_iktarget(skeleton_id.id, index);
+}
+
+SOKOL_API_IMPL bool sspine_iktarget_valid(sspine_iktarget iktarget) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(iktarget.skeleton_id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data);
+        return (iktarget.index >= 0) && (iktarget.index < skeleton->sp_skel_data->ikConstraintsCount);
+    }
+    return false;
+}
+
+SOKOL_API_IMPL bool sspine_iktarget_equal(sspine_iktarget first, sspine_iktarget second) {
+    return (first.skeleton_id == second.skeleton_id) && (first.index == second.index);
+}
+
+SOKOL_API_IMPL sspine_iktarget_info sspine_get_iktarget_info(sspine_iktarget iktarget) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    sspine_iktarget_info res;
+    _sspine_clear(&res, sizeof(res));
+    const spIkConstraintData* ik_data = _sspine_lookup_ikconstraint_data(iktarget.skeleton_id, iktarget.index);
+    if (ik_data) {
+        res.valid = true;
+        res.index = iktarget.index;
+        res.target_bone = _sspine_bone(iktarget.skeleton_id, ik_data->target->index);
+        res.name = _sspine_string(ik_data->name);
+        if (res.name.truncated) {
+            _SSPINE_WARN(STRING_TRUNCATED);
+        }
+    }
+    return res;
+}
+
+SOKOL_API_IMPL void sspine_set_iktarget_world_pos(sspine_instance instance_id, sspine_iktarget iktarget, sspine_vec2 world_pos) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    spIkConstraint* ik_data = _sspine_lookup_ikconstraint(instance_id.id, iktarget.skeleton_id, iktarget.index);
+    if (ik_data) {
+        spBone* bone = ik_data->target;
+        spBone* parent_bone = bone->parent;
+        if (parent_bone) {
+            spBone_worldToLocal(parent_bone, world_pos.x, world_pos.y, &bone->x, &bone->y);
+        }
+    }
+}
+
+SOKOL_API_IMPL int sspine_num_skins(sspine_skeleton skeleton_id) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id.id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data);
+        return skeleton->sp_skel_data->skinsCount;
+    }
+    return 0;
+}
+
+SOKOL_API_IMPL sspine_skin sspine_skin_by_name(sspine_skeleton skeleton_id, const char* name) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    SOKOL_ASSERT(name);
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skeleton_id.id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data);
+        SOKOL_ASSERT(skeleton->sp_skel_data->skins);
+        // spSkin has no embedded index, so we need to loop over the skins
+        for (int i = 0; i < skeleton->sp_skel_data->skinsCount; i++) {
+            SOKOL_ASSERT(skeleton->sp_skel_data->skins[i]);
+            SOKOL_ASSERT(skeleton->sp_skel_data->skins[i]->name);
+            if (0 == strcmp(skeleton->sp_skel_data->skins[i]->name, name)) {
+                return _sspine_skin(skeleton_id.id, i);
+            }
+        }
+    }
+    return _sspine_skin(0, 0);
+}
+
+SOKOL_API_IMPL sspine_skin sspine_skin_by_index(sspine_skeleton skeleton_id, int index) {
+    return _sspine_skin(skeleton_id.id, index);
+}
+
+SOKOL_API_IMPL bool sspine_skin_valid(sspine_skin skin) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_skeleton_t* skeleton = _sspine_lookup_skeleton(skin.skeleton_id);
+    if (_sspine_skeleton_and_deps_valid(skeleton)) {
+        SOKOL_ASSERT(skeleton->sp_skel_data);
+        return (skin.index >= 0) && (skin.index < skeleton->sp_skel_data->skinsCount);
+    }
+    return false;
+}
+
+SOKOL_API_IMPL bool sspine_skin_equal(sspine_skin first, sspine_skin second) {
+    return (first.skeleton_id == second.skeleton_id) && (first.index == second.index);
+}
+
+SOKOL_API_IMPL sspine_skin_info sspine_get_skin_info(sspine_skin skin) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    sspine_skin_info res;
+    _sspine_clear(&res, sizeof(res));
+    const spSkin* sp_skin = _sspine_lookup_skin(skin.skeleton_id, skin.index);
+    if (sp_skin) {
+        res.valid = true;
+        res.index = skin.index;
+        res.name = _sspine_string(sp_skin->name);
+        if (res.name.truncated) {
+            _SSPINE_WARN(STRING_TRUNCATED);
+        }
+    }
+    return res;
+}
+
+SOKOL_SPINE_API_DECL void sspine_set_skin(sspine_instance instance_id, sspine_skin skin) {
+    SOKOL_ASSERT(_SSPINE_INIT_COOKIE == _sspine.init_cookie);
+    _sspine_instance_t* instance = _sspine_lookup_instance(instance_id.id);
+    if (_sspine_instance_and_deps_valid(instance) && (instance->skel.id == skin.skeleton_id)) {
+        SOKOL_ASSERT(instance->sp_skel);
+        SOKOL_ASSERT(instance->sp_anim_state);
+        // clear any currently set skinset
+        instance->skinset.id = SSPINE_INVALID_ID;
+        instance->skinset.ptr = 0;
+        spSkin* sp_skin = _sspine_lookup_skin(skin.skeleton_id, skin.index);
+        if (sp_skin) {
+            spSkeleton_setSkin(instance->sp_skel, 0);
+            spSkeleton_setSkin(instance->sp_skel, sp_skin);
+            spSkeleton_setSlotsToSetupPose(instance->sp_skel);
+            spAnimationState_apply(instance->sp_anim_state, instance->sp_skel);
+        }
+    }
+}
+
+#endif // SOKOL_SPINE_IMPL
+#endif // SOKOL_SPINE_INCLUDED