Convert gamma test to Nuklear

tests/CMakeLists.txt

@@ -21,7 +21,6 @@ set(TINYCTHREAD "${GLFW_SOURCE_DIR}/deps/tinycthread.h"
 add_executable(clipboard clipboard.c ${GETOPT} ${GLAD})
 add_executable(events events.c ${GETOPT} ${GLAD})
 add_executable(msaa msaa.c ${GETOPT} ${GLAD})
-add_executable(gamma gamma.c ${GETOPT} ${GLAD})
 add_executable(glfwinfo glfwinfo.c ${GETOPT} ${GLAD})
 add_executable(iconify iconify.c ${GETOPT} ${GLAD})
 add_executable(joysticks joysticks.c ${GLAD})
@@ -30,6 +29,7 @@ add_executable(reopen reopen.c ${GLAD})
 add_executable(cursor cursor.c ${GLAD})
 
 add_executable(empty WIN32 MACOSX_BUNDLE empty.c ${TINYCTHREAD} ${GLAD})
+add_executable(gamma WIN32 MACOSX_BUNDLE gamma.c ${GLAD})
 add_executable(icon WIN32 MACOSX_BUNDLE icon.c ${GLAD})
 add_executable(sharing WIN32 MACOSX_BUNDLE sharing.c ${GETOPT} ${GLAD})
 add_executable(tearing WIN32 MACOSX_BUNDLE tearing.c ${GETOPT} ${GLAD})
@@ -41,9 +41,10 @@ add_executable(windows WIN32 MACOSX_BUNDLE windows.c ${GETOPT} ${GLAD})
 target_link_libraries(empty "${CMAKE_THREAD_LIBS_INIT}" "${RT_LIBRARY}")
 target_link_libraries(threads "${CMAKE_THREAD_LIBS_INIT}" "${RT_LIBRARY}")
 
-set(WINDOWS_BINARIES empty icon sharing tearing threads timeout title windows)
-set(CONSOLE_BINARIES clipboard events msaa gamma glfwinfo
-                     iconify joysticks monitors reopen cursor)
+set(WINDOWS_BINARIES empty gamma icon sharing tearing threads timeout title
+                     windows)
+set(CONSOLE_BINARIES clipboard events msaa glfwinfo iconify joysticks monitors
+                     reopen cursor)
 
 if (VULKAN_FOUND)
     add_executable(vulkan WIN32 vulkan.c ${ICON})
@@ -65,6 +66,7 @@ endif()
 
 if (APPLE)
     set_target_properties(empty PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Empty Event")
+    set_target_properties(gamma PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Gamma")
     set_target_properties(sharing PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Sharing")
     set_target_properties(tearing PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Tearing")
     set_target_properties(threads PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Threads")

tests/gamma.c

@@ -31,33 +31,22 @@
 #include <glad/glad.h>
 #include <GLFW/glfw3.h>
 
+#define NK_IMPLEMENTATION
+#define NK_INCLUDE_FIXED_TYPES
+#define NK_INCLUDE_FONT_BAKING
+#define NK_INCLUDE_DEFAULT_FONT
+#define NK_INCLUDE_DEFAULT_ALLOCATOR
+#define NK_INCLUDE_VERTEX_BUFFER_OUTPUT
+#define NK_INCLUDE_STANDARD_VARARGS
+#include <nuklear.h>
+
+#define NK_GLFW_GL2_IMPLEMENTATION
+#include <nuklear_glfw_gl2.h>
+
 #include <stdio.h>
 #include <stdlib.h>
 
-#include "getopt.h"
-
-#define STEP_SIZE 0.1f
-
-static GLfloat gamma_value = 1.0f;
-
-static void usage(void)
-{
-    printf("Usage: gamma [-h] [-f]\n");
-    printf("Options:\n");
-    printf("  -f create full screen window\n");
-    printf("  -h show this help\n");
-}
-
-static void set_gamma(GLFWwindow* window, float value)
-{
-    GLFWmonitor* monitor = glfwGetWindowMonitor(window);
-    if (!monitor)
-        monitor = glfwGetPrimaryMonitor();
-
-    gamma_value = value;
-    printf("Gamma: %f\n", gamma_value);
-    glfwSetGamma(monitor, gamma_value);
-}
+static int windowed_xpos, windowed_ypos, windowed_width, windowed_height;
 
 static void error_callback(int error, const char* description)
 {
@@ -66,115 +55,103 @@ static void error_callback(int error, const char* description)
 
 static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
 {
-    if (action != GLFW_PRESS)
-        return;
+    if (action == GLFW_PRESS && key == GLFW_KEY_ESCAPE)
+        glfwSetWindowShouldClose(window, GLFW_TRUE);
+}
 
-    switch (key)
+static void chart_ramp_array(struct nk_context* nk,
+                             struct nk_color color,
+                             int count, unsigned short int* values)
+{
+    if (nk_chart_begin_colored(nk, NK_CHART_LINES,
+                               color, nk_rgb(255, 255, 255),
+                               count, 0, 65535))
     {
-        case GLFW_KEY_ESCAPE:
+        int i;
+        for (i = 0;  i < count;  i++)
         {
-            glfwSetWindowShouldClose(window, GLFW_TRUE);
-            break;
+            char buffer[1024];
+            if (nk_chart_push(nk, values[i]))
+            {
+                snprintf(buffer, sizeof(buffer), "#%u: %u (%0.5f) ",
+                         i, values[i], values[i] / 65535.f);
+                nk_tooltip(nk, buffer);
+            }
         }
 
-        case GLFW_KEY_KP_ADD:
-        case GLFW_KEY_UP:
-        case GLFW_KEY_Q:
-        {
-            set_gamma(window, gamma_value + STEP_SIZE);
-            break;
-        }
-
-        case GLFW_KEY_KP_SUBTRACT:
-        case GLFW_KEY_DOWN:
-        case GLFW_KEY_W:
-        {
-            if (gamma_value - STEP_SIZE > 0.f)
-                set_gamma(window, gamma_value - STEP_SIZE);
-
-            break;
-        }
+        nk_chart_end(nk);
     }
 }
 
-static void framebuffer_size_callback(GLFWwindow* window, int width, int height)
-{
-    glViewport(0, 0, width, height);
-}
-
 int main(int argc, char** argv)
 {
-    int width, height, ch;
     GLFWmonitor* monitor = NULL;
     GLFWwindow* window;
+    struct nk_context* nk;
+    struct nk_font_atlas* atlas;
+    float gamma_value = 1.f;
 
     glfwSetErrorCallback(error_callback);
 
     if (!glfwInit())
         exit(EXIT_FAILURE);
 
-    while ((ch = getopt(argc, argv, "fh")) != -1)
-    {
-        switch (ch)
-        {
-            case 'h':
-                usage();
-                exit(EXIT_SUCCESS);
-
-            case 'f':
-                monitor = glfwGetPrimaryMonitor();
-                break;
-
-            default:
-                usage();
-                exit(EXIT_FAILURE);
-        }
-    }
+    monitor = glfwGetPrimaryMonitor();
 
-    if (monitor)
-    {
-        const GLFWvidmode* mode = glfwGetVideoMode(monitor);
-
-        glfwWindowHint(GLFW_REFRESH_RATE, mode->refreshRate);
-        glfwWindowHint(GLFW_RED_BITS, mode->redBits);
-        glfwWindowHint(GLFW_GREEN_BITS, mode->greenBits);
-        glfwWindowHint(GLFW_BLUE_BITS, mode->blueBits);
-
-        width = mode->width;
-        height = mode->height;
-    }
-    else
-    {
-        width = 200;
-        height = 200;
-    }
-
-    window = glfwCreateWindow(width, height, "Gamma Test", monitor, NULL);
+    window = glfwCreateWindow(800, 400, "Gamma Test", NULL, NULL);
     if (!window)
     {
         glfwTerminate();
         exit(EXIT_FAILURE);
     }
 
-    set_gamma(window, 1.f);
-
     glfwMakeContextCurrent(window);
     gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
     glfwSwapInterval(1);
 
-    glfwSetKeyCallback(window, key_callback);
-    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
+    nk = nk_glfw3_init(window, NK_GLFW3_INSTALL_CALLBACKS);
+    nk_glfw3_font_stash_begin(&atlas);
+    nk_glfw3_font_stash_end();
 
-    glClearColor(0.5f, 0.5f, 0.5f, 0);
+    glfwSetKeyCallback(window, key_callback);
 
     while (!glfwWindowShouldClose(window))
     {
+        int width, height;
+        struct nk_panel layout;
+        struct nk_rect area;
+
+        glfwGetFramebufferSize(window, &width, &height);
+        area = nk_rect(0.f, 0.f, (float) width, (float) height);
+
         glClear(GL_COLOR_BUFFER_BIT);
+        nk_glfw3_new_frame();
+        if (nk_begin(nk, &layout, "", area, 0))
+        {
+            const GLFWgammaramp* ramp = glfwGetGammaRamp(monitor);
+            nk_window_set_bounds(nk, area);
+
+            nk_layout_row_dynamic(nk, 30, 2);
+            if (nk_slider_float(nk, 0.1f, &gamma_value, 5.f, 0.1f))
+                glfwSetGamma(monitor, gamma_value);
+            nk_labelf(nk, NK_TEXT_LEFT, "%0.1f", gamma_value);
+            nk_layout_row_end(nk);
+
+            nk_layout_row_dynamic(nk, height - 60.f, 3);
+            chart_ramp_array(nk, nk_rgb(255, 0, 0), ramp->size, ramp->red);
+            chart_ramp_array(nk, nk_rgb(0, 255, 0), ramp->size, ramp->green);
+            chart_ramp_array(nk, nk_rgb(0,0,  255), ramp->size, ramp->blue);
+            nk_layout_row_end(nk);
+        }
+
+        nk_end(nk);
+        nk_glfw3_render(NK_ANTI_ALIASING_ON, 10000, 1000);
 
         glfwSwapBuffers(window);
-        glfwWaitEvents();
+        glfwWaitEventsTimeout(1.0);
     }
 
+    nk_glfw3_shutdown();
     glfwTerminate();
     exit(EXIT_SUCCESS);
 }