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-rw-r--r--nuklear/example/canvas.c489
1 files changed, 489 insertions, 0 deletions
diff --git a/nuklear/example/canvas.c b/nuklear/example/canvas.c
new file mode 100644
index 0000000..c5f5634
--- /dev/null
+++ b/nuklear/example/canvas.c
@@ -0,0 +1,489 @@
+/* nuklear - v1.05 - 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_PRIVATE
+#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])
+
+#define NK_SHADER_VERSION "#version 150\n"
+
+/* ===============================================================
+ *
+ * DEVICE
+ *
+ * ===============================================================*/
+struct nk_glfw_vertex {
+ float position[2];
+ float uv[2];
+ nk_byte col[4];
+};
+
+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 struct nk_image
+icon_load(const char *filename)
+{
+ int x,y,n;
+ GLuint tex;
+ unsigned char *data = stbi_load(filename, &x, &y, &n, 0);
+ if (!data) die("[SDL]: 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 nk_image_id((int)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_glfw_vertex);
+ size_t vp = offsetof(struct nk_glfw_vertex, position);
+ size_t vt = offsetof(struct nk_glfw_vertex, uv);
+ size_t vc = offsetof(struct nk_glfw_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,
+ 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 convert configuration */
+ struct nk_convert_config config;
+ static const struct nk_draw_vertex_layout_element vertex_layout[] = {
+ {NK_VERTEX_POSITION, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_glfw_vertex, position)},
+ {NK_VERTEX_TEXCOORD, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_glfw_vertex, uv)},
+ {NK_VERTEX_COLOR, NK_FORMAT_R8G8B8A8, NK_OFFSETOF(struct nk_glfw_vertex, col)},
+ {NK_VERTEX_LAYOUT_END}
+ };
+ NK_MEMSET(&config, 0, sizeof(config));
+ config.vertex_layout = vertex_layout;
+ config.vertex_size = sizeof(struct nk_glfw_vertex);
+ config.vertex_alignment = NK_ALIGNOF(struct nk_glfw_vertex);
+ config.null = dev->null;
+ config.circle_segment_count = 22;
+ config.curve_segment_count = 22;
+ config.arc_segment_count = 22;
+ config.global_alpha = 1.0f;
+ config.shape_AA = AA;
+ config.line_AA = AA;
+
+ /* 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),
+ (GLint)((height - (GLint)(cmd->clip_rect.y + cmd->clip_rect.h))),
+ (GLint)(cmd->clip_rect.w),
+ (GLint)(cmd->clip_rect.h));
+ 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);}
+
+static void
+pump_input(struct nk_context *ctx, GLFWwindow *win)
+{
+ 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) == GLFW_PRESS) {
+ 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);
+}
+
+struct nk_canvas {
+ struct nk_command_buffer *painter;
+ struct nk_vec2 item_spacing;
+ struct nk_vec2 panel_padding;
+ struct nk_style_item window_background;
+};
+
+static void
+canvas_begin(struct nk_context *ctx, struct nk_canvas *canvas, nk_flags flags,
+ int x, int y, int width, int height, struct nk_color background_color)
+{
+ /* save style properties which will be overwritten */
+ canvas->panel_padding = ctx->style.window.padding;
+ canvas->item_spacing = ctx->style.window.spacing;
+ canvas->window_background = ctx->style.window.fixed_background;
+
+ /* use the complete window space and set background */
+ ctx->style.window.spacing = nk_vec2(0,0);
+ ctx->style.window.padding = nk_vec2(0,0);
+ ctx->style.window.fixed_background = nk_style_item_color(background_color);
+
+ /* create/update window and set position + size */
+ flags = flags & ~NK_WINDOW_DYNAMIC;
+ nk_begin(ctx, "Window", nk_rect(x, y, width, height), NK_WINDOW_NO_SCROLLBAR|flags);
+ nk_window_set_bounds(ctx, nk_rect(x, y, width, height));
+
+ /* allocate the complete window space for drawing */
+ {struct nk_rect total_space;
+ total_space = nk_window_get_content_region(ctx);
+ nk_layout_row_dynamic(ctx, total_space.h, 1);
+ nk_widget(&total_space, ctx);
+ canvas->painter = nk_window_get_canvas(ctx);}
+}
+
+static void
+canvas_end(struct nk_context *ctx, struct nk_canvas *canvas)
+{
+ nk_end(ctx);
+ ctx->style.window.spacing = canvas->panel_padding;
+ ctx->style.window.padding = canvas->item_spacing;
+ ctx->style.window.fixed_background = canvas->window_background;
+}
+
+int main(int argc, char *argv[])
+{
+ /* Platform */
+ static GLFWwindow *win;
+ int width = 0, height = 0;
+
+ /* GUI */
+ struct device device;
+ struct nk_font_atlas atlas;
+ struct nk_context ctx;
+
+ /* 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);
+ 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);
+
+ /* 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;
+ struct nk_font *font;
+ nk_font_atlas_init_default(&atlas);
+ nk_font_atlas_begin(&atlas);
+ font = nk_font_atlas_add_default(&atlas, 13, 0);
+ 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);
+
+ glEnable(GL_TEXTURE_2D);
+ while (!glfwWindowShouldClose(win))
+ {
+ /* input */
+ pump_input(&ctx, win);
+
+ /* draw */
+ {struct nk_canvas canvas;
+ canvas_begin(&ctx, &canvas, 0, 0, 0, width, height, nk_rgb(250,250,250));
+ {
+ nk_fill_rect(canvas.painter, nk_rect(15,15,210,210), 5, nk_rgb(247, 230, 154));
+ nk_fill_rect(canvas.painter, nk_rect(20,20,200,200), 5, nk_rgb(188, 174, 118));
+ nk_draw_text(canvas.painter, nk_rect(30, 30, 150, 20), "Text to draw", 12, &font->handle, nk_rgb(188,174,118), nk_rgb(0,0,0));
+ nk_fill_rect(canvas.painter, nk_rect(250,20,100,100), 0, nk_rgb(0,0,255));
+ nk_fill_circle(canvas.painter, nk_rect(20,250,100,100), nk_rgb(255,0,0));
+ nk_fill_triangle(canvas.painter, 250, 250, 350, 250, 300, 350, nk_rgb(0,255,0));
+ nk_fill_arc(canvas.painter, 300, 180, 50, 0, 3.141592654f * 3.0f / 4.0f, nk_rgb(255,255,0));
+
+ {float points[12];
+ points[0] = 200; points[1] = 250;
+ points[2] = 250; points[3] = 350;
+ points[4] = 225; points[5] = 350;
+ points[6] = 200; points[7] = 300;
+ points[8] = 175; points[9] = 350;
+ points[10] = 150; points[11] = 350;
+ nk_fill_polygon(canvas.painter, points, 6, nk_rgb(0,0,0));}
+
+ nk_stroke_line(canvas.painter, 15, 10, 200, 10, 2.0f, nk_rgb(189,45,75));
+ nk_stroke_rect(canvas.painter, nk_rect(370, 20, 100, 100), 10, 3, nk_rgb(0,0,255));
+ nk_stroke_curve(canvas.painter, 380, 200, 405, 270, 455, 120, 480, 200, 2, nk_rgb(0,150,220));
+ nk_stroke_circle(canvas.painter, nk_rect(20, 370, 100, 100), 5, nk_rgb(0,255,120));
+ nk_stroke_triangle(canvas.painter, 370, 250, 470, 250, 420, 350, 6, nk_rgb(255,0,143));
+ }
+ canvas_end(&ctx, &canvas);}
+
+ /* Draw */
+ glfwGetWindowSize(win, &width, &height);
+ glViewport(0, 0, width, height);
+ glClear(GL_COLOR_BUFFER_BIT);
+ glClearColor(0.2f, 0.2f, 0.2f, 1.0f);
+ device_draw(&device, &ctx, width, height, NK_ANTI_ALIASING_ON);
+ glfwSwapBuffers(win);
+ }}}
+ nk_font_atlas_clear(&atlas);
+ nk_free(&ctx);
+ device_shutdown(&device);
+ glfwTerminate();
+ return 0;
+}
+
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