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Added GWEN style skinning example #155

This commit adds a GWEN UI style skinning example. It is
certainly not perfect right now (especially windows suck) but
it is probably useful for a general overview. One thing that is
pretty clear for me now is that I need a way to read in a style from
file or memory since manually setting up properties, colors
and images is quite a pain.
vurtun 9 years ago
parent
commit
2e7dd3dc04
2 changed files with 805 additions and 0 deletions
  1. 805 0
      example/skinning.c
  2. BIN
      example/skins/gwen.png

+ 805 - 0
example/skinning.c

@@ -0,0 +1,805 @@
+/* nuklear - v1.00 - public domain */
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdarg.h>
+#include <string.h>
+#include <math.h>
+#include <assert.h>
+#include <math.h>
+#include <time.h>
+#include <limits.h>
+
+#include <GL/glew.h>
+#include <GLFW/glfw3.h>
+
+#define NK_INCLUDE_FIXED_TYPES
+#define NK_INCLUDE_STANDARD_IO
+#define NK_INCLUDE_DEFAULT_ALLOCATOR
+#define NK_INCLUDE_VERTEX_BUFFER_OUTPUT
+#define NK_INCLUDE_FONT_BAKING
+#define NK_INCLUDE_DEFAULT_FONT
+#define NK_IMPLEMENTATION
+#include "../nuklear.h"
+
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"
+
+/* macros */
+#define WINDOW_WIDTH 1200
+#define WINDOW_HEIGHT 800
+
+#define MAX_VERTEX_MEMORY 512 * 1024
+#define MAX_ELEMENT_MEMORY 128 * 1024
+
+#define UNUSED(a) (void)a
+#define MIN(a,b) ((a) < (b) ? (a) : (b))
+#define MAX(a,b) ((a) < (b) ? (b) : (a))
+#define LEN(a) (sizeof(a)/sizeof(a)[0])
+
+#ifdef __APPLE__
+  #define NK_SHADER_VERSION "#version 150\n"
+#else
+  #define NK_SHADER_VERSION "#version 300 es\n"
+#endif
+
+struct media {
+    GLint skin;
+    struct nk_image menu;
+    struct nk_image check;
+    struct nk_image check_cursor;
+    struct nk_image option;
+    struct nk_image option_cursor;
+    struct nk_image header;
+    struct nk_image window;
+    struct nk_image scrollbar_inc_button;
+    struct nk_image scrollbar_inc_button_hover;
+    struct nk_image scrollbar_dec_button;
+    struct nk_image scrollbar_dec_button_hover;
+    struct nk_image button;
+    struct nk_image button_hover;
+    struct nk_image button_active;
+    struct nk_image tab_minimize;
+    struct nk_image tab_maximize;
+    struct nk_image slider;
+    struct nk_image slider_hover;
+    struct nk_image slider_active;
+};
+
+
+/* ===============================================================
+ *
+ *                          DEVICE
+ *
+ * ===============================================================*/
+struct device {
+    struct nk_buffer cmds;
+    struct nk_draw_null_texture null;
+    GLuint vbo, vao, ebo;
+    GLuint prog;
+    GLuint vert_shdr;
+    GLuint frag_shdr;
+    GLint attrib_pos;
+    GLint attrib_uv;
+    GLint attrib_col;
+    GLint uniform_tex;
+    GLint uniform_proj;
+    GLuint font_tex;
+};
+
+static void
+die(const char *fmt, ...)
+{
+    va_list ap;
+    va_start(ap, fmt);
+    vfprintf(stderr, fmt, ap);
+    va_end(ap);
+    fputs("\n", stderr);
+    exit(EXIT_FAILURE);
+}
+
+static GLuint
+image_load(const char *filename)
+{
+    int x,y,n;
+    GLuint tex;
+    unsigned char *data = stbi_load(filename, &x, &y, &n, 0);
+    if (!data) die("failed to load image: %s", filename);
+
+    glGenTextures(1, &tex);
+    glBindTexture(GL_TEXTURE_2D, tex);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_NEAREST);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, x, y, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
+    glGenerateMipmap(GL_TEXTURE_2D);
+    stbi_image_free(data);
+    return tex;
+}
+
+static void
+device_init(struct device *dev)
+{
+    GLint status;
+    static const GLchar *vertex_shader =
+        NK_SHADER_VERSION
+        "uniform mat4 ProjMtx;\n"
+        "in vec2 Position;\n"
+        "in vec2 TexCoord;\n"
+        "in vec4 Color;\n"
+        "out vec2 Frag_UV;\n"
+        "out vec4 Frag_Color;\n"
+        "void main() {\n"
+        "   Frag_UV = TexCoord;\n"
+        "   Frag_Color = Color;\n"
+        "   gl_Position = ProjMtx * vec4(Position.xy, 0, 1);\n"
+        "}\n";
+    static const GLchar *fragment_shader =
+        NK_SHADER_VERSION
+        "precision mediump float;\n"
+        "uniform sampler2D Texture;\n"
+        "in vec2 Frag_UV;\n"
+        "in vec4 Frag_Color;\n"
+        "out vec4 Out_Color;\n"
+        "void main(){\n"
+        "   Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
+        "}\n";
+
+    nk_buffer_init_default(&dev->cmds);
+    dev->prog = glCreateProgram();
+    dev->vert_shdr = glCreateShader(GL_VERTEX_SHADER);
+    dev->frag_shdr = glCreateShader(GL_FRAGMENT_SHADER);
+    glShaderSource(dev->vert_shdr, 1, &vertex_shader, 0);
+    glShaderSource(dev->frag_shdr, 1, &fragment_shader, 0);
+    glCompileShader(dev->vert_shdr);
+    glCompileShader(dev->frag_shdr);
+    glGetShaderiv(dev->vert_shdr, GL_COMPILE_STATUS, &status);
+    assert(status == GL_TRUE);
+    glGetShaderiv(dev->frag_shdr, GL_COMPILE_STATUS, &status);
+    assert(status == GL_TRUE);
+    glAttachShader(dev->prog, dev->vert_shdr);
+    glAttachShader(dev->prog, dev->frag_shdr);
+    glLinkProgram(dev->prog);
+    glGetProgramiv(dev->prog, GL_LINK_STATUS, &status);
+    assert(status == GL_TRUE);
+
+    dev->uniform_tex = glGetUniformLocation(dev->prog, "Texture");
+    dev->uniform_proj = glGetUniformLocation(dev->prog, "ProjMtx");
+    dev->attrib_pos = glGetAttribLocation(dev->prog, "Position");
+    dev->attrib_uv = glGetAttribLocation(dev->prog, "TexCoord");
+    dev->attrib_col = glGetAttribLocation(dev->prog, "Color");
+
+    {
+        /* buffer setup */
+        GLsizei vs = sizeof(struct nk_draw_vertex);
+        size_t vp = offsetof(struct nk_draw_vertex, position);
+        size_t vt = offsetof(struct nk_draw_vertex, uv);
+        size_t vc = offsetof(struct nk_draw_vertex, col);
+
+        glGenBuffers(1, &dev->vbo);
+        glGenBuffers(1, &dev->ebo);
+        glGenVertexArrays(1, &dev->vao);
+
+        glBindVertexArray(dev->vao);
+        glBindBuffer(GL_ARRAY_BUFFER, dev->vbo);
+        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, dev->ebo);
+
+        glEnableVertexAttribArray((GLuint)dev->attrib_pos);
+        glEnableVertexAttribArray((GLuint)dev->attrib_uv);
+        glEnableVertexAttribArray((GLuint)dev->attrib_col);
+
+        glVertexAttribPointer((GLuint)dev->attrib_pos, 2, GL_FLOAT, GL_FALSE, vs, (void*)vp);
+        glVertexAttribPointer((GLuint)dev->attrib_uv, 2, GL_FLOAT, GL_FALSE, vs, (void*)vt);
+        glVertexAttribPointer((GLuint)dev->attrib_col, 4, GL_UNSIGNED_BYTE, GL_TRUE, vs, (void*)vc);
+    }
+
+    glBindTexture(GL_TEXTURE_2D, 0);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+    glBindVertexArray(0);
+}
+
+static void
+device_upload_atlas(struct device *dev, const void *image, int width, int height)
+{
+    glGenTextures(1, &dev->font_tex);
+    glBindTexture(GL_TEXTURE_2D, dev->font_tex);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (GLsizei)width, (GLsizei)height, 0,
+                GL_RGBA, GL_UNSIGNED_BYTE, image);
+}
+
+static void
+device_shutdown(struct device *dev)
+{
+    glDetachShader(dev->prog, dev->vert_shdr);
+    glDetachShader(dev->prog, dev->frag_shdr);
+    glDeleteShader(dev->vert_shdr);
+    glDeleteShader(dev->frag_shdr);
+    glDeleteProgram(dev->prog);
+    glDeleteTextures(1, &dev->font_tex);
+    glDeleteBuffers(1, &dev->vbo);
+    glDeleteBuffers(1, &dev->ebo);
+    nk_buffer_free(&dev->cmds);
+}
+
+static void
+device_draw(struct device *dev, struct nk_context *ctx, int width, int height,
+    struct nk_vec2 scale, enum nk_anti_aliasing AA)
+{
+    GLfloat ortho[4][4] = {
+        {2.0f, 0.0f, 0.0f, 0.0f},
+        {0.0f,-2.0f, 0.0f, 0.0f},
+        {0.0f, 0.0f,-1.0f, 0.0f},
+        {-1.0f,1.0f, 0.0f, 1.0f},
+    };
+    ortho[0][0] /= (GLfloat)width;
+    ortho[1][1] /= (GLfloat)height;
+
+    /* setup global state */
+    glEnable(GL_BLEND);
+    glBlendEquation(GL_FUNC_ADD);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    glDisable(GL_CULL_FACE);
+    glDisable(GL_DEPTH_TEST);
+    glEnable(GL_SCISSOR_TEST);
+    glActiveTexture(GL_TEXTURE0);
+
+    /* setup program */
+    glUseProgram(dev->prog);
+    glUniform1i(dev->uniform_tex, 0);
+    glUniformMatrix4fv(dev->uniform_proj, 1, GL_FALSE, &ortho[0][0]);
+    {
+        /* convert from command queue into draw list and draw to screen */
+        const struct nk_draw_command *cmd;
+        void *vertices, *elements;
+        const nk_draw_index *offset = NULL;
+
+        /* allocate vertex and element buffer */
+        glBindVertexArray(dev->vao);
+        glBindBuffer(GL_ARRAY_BUFFER, dev->vbo);
+        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, dev->ebo);
+
+        glBufferData(GL_ARRAY_BUFFER, MAX_VERTEX_MEMORY, NULL, GL_STREAM_DRAW);
+        glBufferData(GL_ELEMENT_ARRAY_BUFFER, MAX_ELEMENT_MEMORY, NULL, GL_STREAM_DRAW);
+
+        /* load draw vertices & elements directly into vertex + element buffer */
+        vertices = glMapBuffer(GL_ARRAY_BUFFER, GL_WRITE_ONLY);
+        elements = glMapBuffer(GL_ELEMENT_ARRAY_BUFFER, GL_WRITE_ONLY);
+        {
+            /* fill converting configuration */
+            struct nk_convert_config config;
+            memset(&config, 0, sizeof(config));
+            config.global_alpha = 1.0f;
+            config.shape_AA = AA;
+            config.line_AA = AA;
+            config.circle_segment_count = 22;
+            config.curve_segment_count = 22;
+            config.arc_segment_count = 22;
+            config.null = dev->null;
+
+            /* setup buffers to load vertices and elements */
+            {struct nk_buffer vbuf, ebuf;
+            nk_buffer_init_fixed(&vbuf, vertices, MAX_VERTEX_MEMORY);
+            nk_buffer_init_fixed(&ebuf, elements, MAX_ELEMENT_MEMORY);
+            nk_convert(ctx, &dev->cmds, &vbuf, &ebuf, &config);}
+        }
+        glUnmapBuffer(GL_ARRAY_BUFFER);
+        glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);
+
+        /* iterate over and execute each draw command */
+        nk_draw_foreach(cmd, ctx, &dev->cmds)
+        {
+            if (!cmd->elem_count) continue;
+            glBindTexture(GL_TEXTURE_2D, (GLuint)cmd->texture.id);
+            glScissor(
+                (GLint)(cmd->clip_rect.x * scale.x),
+                (GLint)((height - (GLint)(cmd->clip_rect.y + cmd->clip_rect.h)) * scale.y),
+                (GLint)(cmd->clip_rect.w * scale.x),
+                (GLint)(cmd->clip_rect.h * scale.y));
+            glDrawElements(GL_TRIANGLES, (GLsizei)cmd->elem_count, GL_UNSIGNED_SHORT, offset);
+            offset += cmd->elem_count;
+        }
+        nk_clear(ctx);
+    }
+
+    /* default OpenGL state */
+    glUseProgram(0);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+    glBindVertexArray(0);
+    glDisable(GL_BLEND);
+    glDisable(GL_SCISSOR_TEST);
+}
+
+/* glfw callbacks (I don't know if there is a easier way to access text and scroll )*/
+static void error_callback(int e, const char *d){printf("Error %d: %s\n", e, d);}
+static void text_input(GLFWwindow *win, unsigned int codepoint)
+{nk_input_unicode((struct nk_context*)glfwGetWindowUserPointer(win), codepoint);}
+static void scroll_input(GLFWwindow *win, double _, double yoff)
+{UNUSED(_);nk_input_scroll((struct nk_context*)glfwGetWindowUserPointer(win), (float)yoff);}
+
+int main(int argc, char *argv[])
+{
+    /* Platform */
+    static GLFWwindow *win;
+    int width = 0, height = 0;
+    int display_width=0, display_height=0;
+
+    /* GUI */
+    struct device device;
+    struct nk_font_atlas atlas;
+    struct media media;
+    struct nk_context ctx;
+    struct nk_font *font;
+
+    /* GLFW */
+    glfwSetErrorCallback(error_callback);
+    if (!glfwInit()) {
+        fprintf(stdout, "[GFLW] failed to init!\n");
+        exit(1);
+    }
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+#ifdef __APPLE__
+    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
+#endif
+    win = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "Demo", NULL, NULL);
+    glfwMakeContextCurrent(win);
+    glfwSetWindowUserPointer(win, &ctx);
+    glfwSetCharCallback(win, text_input);
+    glfwSetScrollCallback(win, scroll_input);
+    glfwGetWindowSize(win, &width, &height);
+    glfwGetFramebufferSize(win, &display_width, &display_height);
+
+    /* OpenGL */
+    glViewport(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT);
+    glewExperimental = 1;
+    if (glewInit() != GLEW_OK) {
+        fprintf(stderr, "Failed to setup GLEW\n");
+        exit(1);
+    }
+
+    /* GUI */
+    {device_init(&device);
+    {const void *image; int w, h;
+    const char *font_path = (argc > 1) ? argv[1]: 0;
+    nk_font_atlas_init_default(&atlas);
+    nk_font_atlas_begin(&atlas);
+    if (font_path) font = nk_font_atlas_add_from_file(&atlas, font_path, 13.0f, NULL);
+    else font = nk_font_atlas_add_default(&atlas, 13.0f, NULL);
+    image = nk_font_atlas_bake(&atlas, &w, &h, NK_FONT_ATLAS_RGBA32);
+    device_upload_atlas(&device, image, w, h);
+    nk_font_atlas_end(&atlas, nk_handle_id((int)device.font_tex), &device.null);}
+    nk_init_default(&ctx, &font->handle);}
+
+    {   /* skin */
+        glEnable(GL_TEXTURE_2D);
+        media.skin = image_load("../skins/gwen.png");
+        media.check = nk_subimage_id(media.skin, 512,512, nk_rect(464,32,15,15));
+        media.check_cursor = nk_subimage_id(media.skin, 512,512, nk_rect(450,34,11,11));
+        media.option = nk_subimage_id(media.skin, 512,512, nk_rect(464,64,15,15));
+        media.option_cursor = nk_subimage_id(media.skin, 512,512, nk_rect(451,67,9,9));
+        media.header = nk_subimage_id(media.skin, 512,512, nk_rect(128,0,127,24));
+        media.window = nk_subimage_id(media.skin, 512,512, nk_rect(128,23,127,104));
+        media.scrollbar_inc_button = nk_subimage_id(media.skin, 512,512, nk_rect(464,256,15,15));
+        media.scrollbar_inc_button_hover = nk_subimage_id(media.skin, 512,512, nk_rect(464,320,15,15));
+        media.scrollbar_dec_button = nk_subimage_id(media.skin, 512,512, nk_rect(464,224,15,15));
+        media.scrollbar_dec_button_hover = nk_subimage_id(media.skin, 512,512, nk_rect(464,288,15,15));
+        media.button = nk_subimage_id(media.skin, 512,512, nk_rect(384,336,127,31));
+        media.button_hover = nk_subimage_id(media.skin, 512,512, nk_rect(384,368,127,31));
+        media.button_active = nk_subimage_id(media.skin, 512,512, nk_rect(384,400,127,31));
+        media.tab_minimize = nk_subimage_id(media.skin, 512,512, nk_rect(451, 99, 9, 9));
+        media.tab_maximize = nk_subimage_id(media.skin, 512,512, nk_rect(467,99,9,9));
+        media.slider = nk_subimage_id(media.skin, 512,512, nk_rect(418,33,11,14));
+        media.slider_hover = nk_subimage_id(media.skin, 512,512, nk_rect(418,49,11,14));
+        media.slider_active = nk_subimage_id(media.skin, 512,512, nk_rect(418,64,11,14));
+
+        /* window */
+        ctx.style.window.background = nk_rgb(204,204,204);
+        ctx.style.window.fixed_background = nk_style_item_image(media.window);
+        ctx.style.window.border_color = nk_rgb(67,67,67);
+        ctx.style.window.combo_border_color = nk_rgb(67,67,67);
+        ctx.style.window.contextual_border_color = nk_rgb(67,67,67);
+        ctx.style.window.menu_border_color = nk_rgb(67,67,67);
+        ctx.style.window.group_border_color = nk_rgb(67,67,67);
+        ctx.style.window.tooltip_border_color = nk_rgb(67,67,67);
+        ctx.style.window.scrollbar_size = nk_vec2(16,16);
+        ctx.style.window.border_color = nk_rgba(0,0,0,0);
+        ctx.style.window.padding = nk_vec2(8,4);
+        ctx.style.window.border = 3;
+
+        /* window header */
+        ctx.style.window.header;
+        ctx.style.window.header.normal = nk_style_item_image(media.header);
+        ctx.style.window.header.hover = nk_style_item_image(media.header);
+        ctx.style.window.header.active = nk_style_item_image(media.header);
+        ctx.style.window.header.label_normal = nk_rgb(95,95,95);
+        ctx.style.window.header.label_hover = nk_rgb(95,95,95);
+        ctx.style.window.header.label_active = nk_rgb(95,95,95);
+
+        /* scrollbar */
+        ctx.style.scrollv.normal          = nk_style_item_color(nk_rgb(184,184,184));
+        ctx.style.scrollv.hover           = nk_style_item_color(nk_rgb(184,184,184));
+        ctx.style.scrollv.active          = nk_style_item_color(nk_rgb(184,184,184));
+        ctx.style.scrollv.cursor_normal   = nk_style_item_color(nk_rgb(220,220,220));
+        ctx.style.scrollv.cursor_hover    = nk_style_item_color(nk_rgb(235,235,235));
+        ctx.style.scrollv.cursor_active   = nk_style_item_color(nk_rgb(99,202,255));
+        ctx.style.scrollv.dec_symbol      = NK_SYMBOL_NONE;
+        ctx.style.scrollv.inc_symbol      = NK_SYMBOL_NONE;
+        ctx.style.scrollv.show_buttons    = nk_true;
+        ctx.style.scrollv.border_color    = nk_rgb(81,81,81);
+        ctx.style.scrollv.cursor_border_color = nk_rgb(81,81,81);
+        ctx.style.scrollv.border          = 1;
+        ctx.style.scrollv.rounding        = 0;
+        ctx.style.scrollv.border_cursor   = 1;
+        ctx.style.scrollv.rounding_cursor = 2;
+
+        /* scrollbar buttons */
+        ctx.style.scrollv.inc_button.normal          = nk_style_item_image(media.scrollbar_inc_button);
+        ctx.style.scrollv.inc_button.hover           = nk_style_item_image(media.scrollbar_inc_button_hover);
+        ctx.style.scrollv.inc_button.active          = nk_style_item_image(media.scrollbar_inc_button_hover);
+        ctx.style.scrollv.inc_button.border_color    = nk_rgba(0,0,0,0);
+        ctx.style.scrollv.inc_button.text_background = nk_rgba(0,0,0,0);
+        ctx.style.scrollv.inc_button.text_normal     = nk_rgba(0,0,0,0);
+        ctx.style.scrollv.inc_button.text_hover      = nk_rgba(0,0,0,0);
+        ctx.style.scrollv.inc_button.text_active     = nk_rgba(0,0,0,0);
+        ctx.style.scrollv.inc_button.border          = 0.0f;
+
+        ctx.style.scrollv.dec_button.normal          = nk_style_item_image(media.scrollbar_dec_button);
+        ctx.style.scrollv.dec_button.hover           = nk_style_item_image(media.scrollbar_dec_button_hover);
+        ctx.style.scrollv.dec_button.active          = nk_style_item_image(media.scrollbar_dec_button_hover);
+        ctx.style.scrollv.dec_button.border_color    = nk_rgba(0,0,0,0);
+        ctx.style.scrollv.dec_button.text_background = nk_rgba(0,0,0,0);
+        ctx.style.scrollv.dec_button.text_normal     = nk_rgba(0,0,0,0);
+        ctx.style.scrollv.dec_button.text_hover      = nk_rgba(0,0,0,0);
+        ctx.style.scrollv.dec_button.text_active     = nk_rgba(0,0,0,0);
+        ctx.style.scrollv.dec_button.border          = 0.0f;
+
+        /* checkbox toggle */
+        {struct nk_style_toggle *toggle;
+        toggle = &ctx.style.checkbox;
+        toggle->normal          = nk_style_item_image(media.check);
+        toggle->hover           = nk_style_item_image(media.check);
+        toggle->active          = nk_style_item_image(media.check);
+        toggle->cursor_normal   = nk_style_item_image(media.check_cursor);
+        toggle->cursor_hover    = nk_style_item_image(media.check_cursor);
+        toggle->text_normal     = nk_rgb(95,95,95);
+        toggle->text_hover      = nk_rgb(95,95,95);
+        toggle->text_active     = nk_rgb(95,95,95);}
+
+        /* option toggle */
+        {struct nk_style_toggle *toggle;
+        toggle = &ctx.style.option;
+        toggle->normal          = nk_style_item_image(media.option);
+        toggle->hover           = nk_style_item_image(media.option);
+        toggle->active          = nk_style_item_image(media.option);
+        toggle->cursor_normal   = nk_style_item_image(media.option_cursor);
+        toggle->cursor_hover    = nk_style_item_image(media.option_cursor);
+        toggle->text_normal     = nk_rgb(95,95,95);
+        toggle->text_hover      = nk_rgb(95,95,95);
+        toggle->text_active     = nk_rgb(95,95,95);}
+
+        /* default button */
+        ctx.style.button.normal = nk_style_item_image(media.button);
+        ctx.style.button.hover = nk_style_item_image(media.button_hover);
+        ctx.style.button.active = nk_style_item_image(media.button_active);
+        ctx.style.button.border_color = nk_rgba(0,0,0,0);
+        ctx.style.button.text_background = nk_rgba(0,0,0,0);
+        ctx.style.button.text_normal = nk_rgb(95,95,95);
+        ctx.style.button.text_hover = nk_rgb(95,95,95);
+        ctx.style.button.text_active = nk_rgb(95,95,95);
+
+        /* contextual button */
+        ctx.style.contextual_button.normal = nk_style_item_color(nk_rgb(206,206,206));
+        ctx.style.contextual_button.hover = nk_style_item_color(nk_rgb(229,229,229));
+        ctx.style.contextual_button.active = nk_style_item_color(nk_rgb(99,202,255));
+        ctx.style.contextual_button.border_color = nk_rgba(0,0,0,0);
+        ctx.style.contextual_button.text_background = nk_rgba(0,0,0,0);
+        ctx.style.contextual_button.text_normal = nk_rgb(95,95,95);
+        ctx.style.contextual_button.text_hover = nk_rgb(95,95,95);
+        ctx.style.contextual_button.text_active = nk_rgb(95,95,95);
+
+        /* menu button */
+        ctx.style.menu_button.normal = nk_style_item_color(nk_rgb(206,206,206));
+        ctx.style.menu_button.hover = nk_style_item_color(nk_rgb(229,229,229));
+        ctx.style.menu_button.active = nk_style_item_color(nk_rgb(99,202,255));
+        ctx.style.menu_button.border_color = nk_rgba(0,0,0,0);
+        ctx.style.menu_button.text_background = nk_rgba(0,0,0,0);
+        ctx.style.menu_button.text_normal = nk_rgb(95,95,95);
+        ctx.style.menu_button.text_hover = nk_rgb(95,95,95);
+        ctx.style.menu_button.text_active = nk_rgb(95,95,95);
+
+        /* tree */
+        ctx.style.tab.text = nk_rgb(95,95,95);
+        ctx.style.tab.tab_minimize_button.normal = nk_style_item_image(media.tab_minimize);
+        ctx.style.tab.tab_minimize_button.hover = nk_style_item_image(media.tab_minimize);
+        ctx.style.tab.tab_minimize_button.active = nk_style_item_image(media.tab_minimize);
+        ctx.style.tab.tab_minimize_button.text_background = nk_rgba(0,0,0,0);
+        ctx.style.tab.tab_minimize_button.text_normal = nk_rgba(0,0,0,0);
+        ctx.style.tab.tab_minimize_button.text_hover = nk_rgba(0,0,0,0);
+        ctx.style.tab.tab_minimize_button.text_active = nk_rgba(0,0,0,0);
+
+        ctx.style.tab.tab_maximize_button.normal = nk_style_item_image(media.tab_maximize);
+        ctx.style.tab.tab_maximize_button.hover = nk_style_item_image(media.tab_maximize);
+        ctx.style.tab.tab_maximize_button.active = nk_style_item_image(media.tab_maximize);
+        ctx.style.tab.tab_maximize_button.text_background = nk_rgba(0,0,0,0);
+        ctx.style.tab.tab_maximize_button.text_normal = nk_rgba(0,0,0,0);
+        ctx.style.tab.tab_maximize_button.text_hover = nk_rgba(0,0,0,0);
+        ctx.style.tab.tab_maximize_button.text_active = nk_rgba(0,0,0,0);
+
+        ctx.style.tab.node_minimize_button.normal = nk_style_item_image(media.tab_minimize);
+        ctx.style.tab.node_minimize_button.hover = nk_style_item_image(media.tab_minimize);
+        ctx.style.tab.node_minimize_button.active = nk_style_item_image(media.tab_minimize);
+        ctx.style.tab.node_minimize_button.text_background = nk_rgba(0,0,0,0);
+        ctx.style.tab.node_minimize_button.text_normal = nk_rgba(0,0,0,0);
+        ctx.style.tab.node_minimize_button.text_hover = nk_rgba(0,0,0,0);
+        ctx.style.tab.node_minimize_button.text_active = nk_rgba(0,0,0,0);
+
+        ctx.style.tab.node_maximize_button.normal = nk_style_item_image(media.tab_maximize);
+        ctx.style.tab.node_maximize_button.hover = nk_style_item_image(media.tab_maximize);
+        ctx.style.tab.node_maximize_button.active = nk_style_item_image(media.tab_maximize);
+        ctx.style.tab.node_maximize_button.text_background = nk_rgba(0,0,0,0);
+        ctx.style.tab.node_maximize_button.text_normal = nk_rgba(0,0,0,0);
+        ctx.style.tab.node_maximize_button.text_hover = nk_rgba(0,0,0,0);
+        ctx.style.tab.node_maximize_button.text_active = nk_rgba(0,0,0,0);
+
+        /* selectable */
+        ctx.style.selectable.normal = nk_style_item_color(nk_rgb(206,206,206));
+        ctx.style.selectable.hover = nk_style_item_color(nk_rgb(206,206,206));
+        ctx.style.selectable.pressed = nk_style_item_color(nk_rgb(206,206,206));
+        ctx.style.selectable.normal_active = nk_style_item_color(nk_rgb(185,205,248));
+        ctx.style.selectable.hover_active = nk_style_item_color(nk_rgb(185,205,248));
+        ctx.style.selectable.pressed_active = nk_style_item_color(nk_rgb(185,205,248));
+        ctx.style.selectable.text_normal = nk_rgb(95,95,95);
+        ctx.style.selectable.text_hover = nk_rgb(95,95,95);
+        ctx.style.selectable.text_pressed = nk_rgb(95,95,95);
+        ctx.style.selectable.text_normal_active = nk_rgb(95,95,95);
+        ctx.style.selectable.text_hover_active = nk_rgb(95,95,95);
+        ctx.style.selectable.text_pressed_active = nk_rgb(95,95,95);
+
+        /* slider */
+        ctx.style.slider.normal          = nk_style_item_hide();
+        ctx.style.slider.hover           = nk_style_item_hide();
+        ctx.style.slider.active          = nk_style_item_hide();
+        ctx.style.slider.bar_normal      = nk_rgb(156,156,156);
+        ctx.style.slider.bar_hover       = nk_rgb(156,156,156);
+        ctx.style.slider.bar_active      = nk_rgb(156,156,156);
+        ctx.style.slider.bar_filled      = nk_rgb(156,156,156);
+        ctx.style.slider.cursor_normal   = nk_style_item_image(media.slider);
+        ctx.style.slider.cursor_hover    = nk_style_item_image(media.slider_hover);
+        ctx.style.slider.cursor_active   = nk_style_item_image(media.slider_active);
+        ctx.style.slider.cursor_size     = nk_vec2(16.5f,21);
+        ctx.style.slider.bar_height      = 1;
+
+        /* progressbar */
+        ctx.style.progress.normal = nk_style_item_color(nk_rgb(231,231,231));
+        ctx.style.progress.hover = nk_style_item_color(nk_rgb(231,231,231));
+        ctx.style.progress.active = nk_style_item_color(nk_rgb(231,231,231));
+        ctx.style.progress.cursor_normal = nk_style_item_color(nk_rgb(63,242,93));
+        ctx.style.progress.cursor_hover = nk_style_item_color(nk_rgb(63,242,93));
+        ctx.style.progress.cursor_active = nk_style_item_color(nk_rgb(63,242,93));
+        ctx.style.progress.border_color = nk_rgb(114,116,115);
+        ctx.style.progress.padding = nk_vec2(0,0);
+        ctx.style.progress.border = 2;
+        ctx.style.progress.rounding = 1;
+
+        /* combo */
+        ctx.style.combo.normal = nk_style_item_color(nk_rgb(216,216,216));
+        ctx.style.combo.hover = nk_style_item_color(nk_rgb(216,216,216));
+        ctx.style.combo.active = nk_style_item_color(nk_rgb(216,216,216));
+        ctx.style.combo.border_color = nk_rgb(95,95,95);
+        ctx.style.combo.label_normal = nk_rgb(95,95,95);
+        ctx.style.combo.label_hover = nk_rgb(95,95,95);
+        ctx.style.combo.label_active = nk_rgb(95,95,95);
+        ctx.style.combo.border = 1;
+        ctx.style.combo.rounding = 1;
+
+        /* combo button */
+        ctx.style.combo.button.normal = nk_style_item_color(nk_rgb(216,216,216));
+        ctx.style.combo.button.hover = nk_style_item_color(nk_rgb(216,216,216));
+        ctx.style.combo.button.active = nk_style_item_color(nk_rgb(216,216,216));
+        ctx.style.combo.button.text_background = nk_rgb(216,216,216);
+        ctx.style.combo.button.text_normal = nk_rgb(95,95,95);
+        ctx.style.combo.button.text_hover = nk_rgb(95,95,95);
+        ctx.style.combo.button.text_active = nk_rgb(95,95,95);
+
+        /* property */
+        ctx.style.property.normal = nk_style_item_color(nk_rgb(216,216,216));
+        ctx.style.property.hover = nk_style_item_color(nk_rgb(216,216,216));
+        ctx.style.property.active = nk_style_item_color(nk_rgb(216,216,216));
+        ctx.style.property.border_color = nk_rgb(81,81,81);
+        ctx.style.property.label_normal = nk_rgb(95,95,95);
+        ctx.style.property.label_hover = nk_rgb(95,95,95);
+        ctx.style.property.label_active = nk_rgb(95,95,95);
+        ctx.style.property.sym_left = NK_SYMBOL_TRIANGLE_LEFT;
+        ctx.style.property.sym_right = NK_SYMBOL_TRIANGLE_RIGHT;
+        ctx.style.property.rounding = 10;
+        ctx.style.property.border = 1;
+
+        /* edit */
+        ctx.style.edit.normal = nk_style_item_color(nk_rgb(240,240,240));
+        ctx.style.edit.hover = nk_style_item_color(nk_rgb(240,240,240));
+        ctx.style.edit.active = nk_style_item_color(nk_rgb(240,240,240));
+        ctx.style.edit.border_color = nk_rgb(62,62,62);
+        ctx.style.edit.cursor_normal = nk_rgb(99,202,255);
+        ctx.style.edit.cursor_hover = nk_rgb(99,202,255);
+        ctx.style.edit.cursor_text_normal = nk_rgb(95,95,95);
+        ctx.style.edit.cursor_text_hover = nk_rgb(95,95,95);
+        ctx.style.edit.text_normal = nk_rgb(95,95,95);
+        ctx.style.edit.text_hover = nk_rgb(95,95,95);
+        ctx.style.edit.text_active = nk_rgb(95,95,95);
+        ctx.style.edit.selected_normal = nk_rgb(99,202,255);
+        ctx.style.edit.selected_hover = nk_rgb(99,202,255);
+        ctx.style.edit.selected_text_normal = nk_rgb(95,95,95);
+        ctx.style.edit.selected_text_hover = nk_rgb(95,95,95);
+        ctx.style.edit.border = 1;
+        ctx.style.edit.rounding = 2;
+
+        /* property buttons */
+        ctx.style.property.dec_button.normal = nk_style_item_color(nk_rgb(216,216,216));
+        ctx.style.property.dec_button.hover = nk_style_item_color(nk_rgb(216,216,216));
+        ctx.style.property.dec_button.active = nk_style_item_color(nk_rgb(216,216,216));
+        ctx.style.property.dec_button.text_background = nk_rgba(0,0,0,0);
+        ctx.style.property.dec_button.text_normal = nk_rgb(95,95,95);
+        ctx.style.property.dec_button.text_hover = nk_rgb(95,95,95);
+        ctx.style.property.dec_button.text_active = nk_rgb(95,95,95);
+        ctx.style.property.inc_button = ctx.style.property.dec_button;
+
+        /* property edit */
+        ctx.style.property.edit.normal = nk_style_item_color(nk_rgb(216,216,216));
+        ctx.style.property.edit.hover = nk_style_item_color(nk_rgb(216,216,216));
+        ctx.style.property.edit.active = nk_style_item_color(nk_rgb(216,216,216));
+        ctx.style.property.edit.border_color = nk_rgba(0,0,0,0);
+        ctx.style.property.edit.cursor_normal = nk_rgb(95,95,95);
+        ctx.style.property.edit.cursor_hover = nk_rgb(95,95,95);
+        ctx.style.property.edit.cursor_text_normal = nk_rgb(216,216,216);
+        ctx.style.property.edit.cursor_text_hover = nk_rgb(216,216,216);
+        ctx.style.property.edit.text_normal = nk_rgb(95,95,95);
+        ctx.style.property.edit.text_hover = nk_rgb(95,95,95);
+        ctx.style.property.edit.text_active = nk_rgb(95,95,95);
+        ctx.style.property.edit.selected_normal = nk_rgb(95,95,95);
+        ctx.style.property.edit.selected_hover = nk_rgb(95,95,95);
+        ctx.style.property.edit.selected_text_normal = nk_rgb(216,216,216);
+        ctx.style.property.edit.selected_text_hover = nk_rgb(216,216,216);
+
+        /* chart */
+        ctx.style.chart.background = nk_style_item_color(nk_rgb(216,216,216));
+        ctx.style.chart.border_color = nk_rgb(81,81,81);
+        ctx.style.chart.color = nk_rgb(95,95,95);
+        ctx.style.chart.selected_color = nk_rgb(255,0,0);
+        ctx.style.chart.border = 1;
+    }
+
+    while (!glfwWindowShouldClose(win))
+    {
+        /* High DPI displays */
+        struct nk_vec2 scale;
+        glfwGetWindowSize(win, &width, &height);
+        glfwGetFramebufferSize(win, &display_width, &display_height);
+        scale.x = (float)display_width/(float)width;
+        scale.y = (float)display_height/(float)height;
+
+        /* Input */
+        {double x, y;
+        nk_input_begin(&ctx);
+        glfwPollEvents();
+        nk_input_key(&ctx, NK_KEY_DEL, glfwGetKey(win, GLFW_KEY_DELETE) == GLFW_PRESS);
+        nk_input_key(&ctx, NK_KEY_ENTER, glfwGetKey(win, GLFW_KEY_ENTER) == GLFW_PRESS);
+        nk_input_key(&ctx, NK_KEY_TAB, glfwGetKey(win, GLFW_KEY_TAB) == GLFW_PRESS);
+        nk_input_key(&ctx, NK_KEY_BACKSPACE, glfwGetKey(win, GLFW_KEY_BACKSPACE) == GLFW_PRESS);
+        nk_input_key(&ctx, NK_KEY_LEFT, glfwGetKey(win, GLFW_KEY_LEFT) == GLFW_PRESS);
+        nk_input_key(&ctx, NK_KEY_RIGHT, glfwGetKey(win, GLFW_KEY_RIGHT) == GLFW_PRESS);
+        nk_input_key(&ctx, NK_KEY_UP, glfwGetKey(win, GLFW_KEY_UP) == GLFW_PRESS);
+        nk_input_key(&ctx, NK_KEY_DOWN, glfwGetKey(win, GLFW_KEY_DOWN) == GLFW_PRESS);
+        if (glfwGetKey(win, GLFW_KEY_LEFT_CONTROL) == GLFW_PRESS ||
+            glfwGetKey(win, GLFW_KEY_RIGHT_CONTROL)) {
+            nk_input_key(&ctx, NK_KEY_COPY, glfwGetKey(win, GLFW_KEY_C) == GLFW_PRESS);
+            nk_input_key(&ctx, NK_KEY_PASTE, glfwGetKey(win, GLFW_KEY_P) == GLFW_PRESS);
+            nk_input_key(&ctx, NK_KEY_CUT, glfwGetKey(win, GLFW_KEY_X) == GLFW_PRESS);
+            nk_input_key(&ctx, NK_KEY_CUT, glfwGetKey(win, GLFW_KEY_E) == GLFW_PRESS);
+            nk_input_key(&ctx, NK_KEY_SHIFT, 1);
+        } else {
+            nk_input_key(&ctx, NK_KEY_COPY, 0);
+            nk_input_key(&ctx, NK_KEY_PASTE, 0);
+            nk_input_key(&ctx, NK_KEY_CUT, 0);
+            nk_input_key(&ctx, NK_KEY_SHIFT, 0);
+        }
+        glfwGetCursorPos(win, &x, &y);
+        nk_input_motion(&ctx, (int)x, (int)y);
+        nk_input_button(&ctx, NK_BUTTON_LEFT, (int)x, (int)y, glfwGetMouseButton(win, GLFW_MOUSE_BUTTON_LEFT) == GLFW_PRESS);
+        nk_input_button(&ctx, NK_BUTTON_MIDDLE, (int)x, (int)y, glfwGetMouseButton(win, GLFW_MOUSE_BUTTON_MIDDLE) == GLFW_PRESS);
+        nk_input_button(&ctx, NK_BUTTON_RIGHT, (int)x, (int)y, glfwGetMouseButton(win, GLFW_MOUSE_BUTTON_RIGHT) == GLFW_PRESS);
+        nk_input_end(&ctx);}
+
+        /* GUI */
+        {struct nk_panel layout, tab;
+        if (nk_begin(&ctx, &layout, "Demo", nk_rect(50, 50, 300, 400),
+            NK_WINDOW_BORDER|NK_WINDOW_MOVABLE|NK_WINDOW_TITLE))
+        {
+            int i;
+            float id;
+            static int slider = 10;
+            static int field_len;
+            static nk_size prog_value = 60;
+            static int current_weapon = 0;
+            static char field_buffer[64];
+            static float pos;
+            static const char *weapons[] = {"Fist","Pistol","Shotgun","Plasma","BFG"};
+            const float step = (2*3.141592654f) / 32;
+
+            nk_layout_row_static(&ctx, 30, 120, 1);
+            if (nk_button_label(&ctx, "button", NK_BUTTON_DEFAULT))
+                fprintf(stdout, "button pressed\n");
+
+            nk_layout_row_dynamic(&ctx, 30, 2);
+            nk_check_label(&ctx, "inactive", 0);
+            nk_check_label(&ctx, "active", 1);
+            nk_option_label(&ctx, "active", 1);
+            nk_option_label(&ctx, "inactive", 0);
+
+            nk_layout_row_dynamic(&ctx, 30, 1);
+            nk_slider_int(&ctx, 0, &slider, 16, 1);
+            nk_layout_row_dynamic(&ctx, 20, 1);
+            nk_progress(&ctx, &prog_value, 100, NK_MODIFIABLE);
+
+            nk_layout_row_dynamic(&ctx, 25, 1);
+            nk_edit_string(&ctx, NK_EDIT_FIELD, field_buffer, &field_len, 64, nk_filter_default);
+            nk_property_float(&ctx, "#X:", -1024.0f, &pos, 1024.0f, 1, 1);
+            current_weapon = nk_combo(&ctx, weapons, LEN(weapons), current_weapon, 25);
+
+            nk_layout_row_dynamic(&ctx, 100, 1);
+            if (nk_chart_begin_colored(&ctx, NK_CHART_LINES, nk_rgb(255,0,0), nk_rgb(150,0,0), 32, 0.0f, 1.0f)) {
+                nk_chart_add_slot_colored(&ctx, NK_CHART_LINES, nk_rgb(0,0,255), nk_rgb(0,0,150),32, -1.0f, 1.0f);
+                nk_chart_add_slot_colored(&ctx, NK_CHART_LINES, nk_rgb(0,255,0), nk_rgb(0,150,0), 32, -1.0f, 1.0f);
+                for (id = 0, i = 0; i < 32; ++i) {
+                    nk_chart_push_slot(&ctx, (float)fabs(sin(id)), 0);
+                    nk_chart_push_slot(&ctx, (float)cos(id), 1);
+                    nk_chart_push_slot(&ctx, (float)sin(id), 2);
+                    id += step;
+                }
+            }
+            nk_chart_end(&ctx);
+
+            nk_layout_row_dynamic(&ctx, 250, 1);
+            if (nk_group_begin(&ctx, &tab, "Standard", NK_WINDOW_BORDER|NK_WINDOW_BORDER))
+            {
+                if (nk_tree_push(&ctx, NK_TREE_NODE, "Window", NK_MAXIMIZED)) {
+                    static int selected[8];
+                    if (nk_tree_push(&ctx, NK_TREE_NODE, "Next", NK_MAXIMIZED)) {
+                        nk_layout_row_dynamic(&ctx, 20, 1);
+                        for (i = 0; i < 4; ++i)
+                            nk_selectable_label(&ctx, (selected[i]) ? "Selected": "Unselected", NK_TEXT_LEFT, &selected[i]);
+                        nk_tree_pop(&ctx);
+                    }
+                    if (nk_tree_push(&ctx, NK_TREE_NODE, "Previous", NK_MAXIMIZED)) {
+                        nk_layout_row_dynamic(&ctx, 20, 1);
+                        for (i = 4; i < 8; ++i)
+                            nk_selectable_label(&ctx, (selected[i]) ? "Selected": "Unselected", NK_TEXT_LEFT, &selected[i]);
+                        nk_tree_pop(&ctx);
+                    }
+                    nk_tree_pop(&ctx);
+                }
+                nk_group_end(&ctx);
+            }
+        }
+        nk_end(&ctx);}
+
+        /* Draw */
+        glViewport(0, 0, display_width, display_height);
+        glClear(GL_COLOR_BUFFER_BIT);
+        glClearColor(0.5882, 0.6666, 0.6666, 1.0f);
+        device_draw(&device, &ctx, width, height, scale, NK_ANTI_ALIASING_ON);
+        glfwSwapBuffers(win);
+    }
+    glDeleteTextures(1,(const GLuint*)&media.skin);
+    nk_font_atlas_clear(&atlas);
+    nk_free(&ctx);
+    device_shutdown(&device);
+    glfwTerminate();
+    return 0;
+}
+

BIN
example/skins/gwen.png