1 /* nuklear - v1.05 - public domain */
2 #include <stdio.h>
3 #include <stdlib.h>
4 #include <stdint.h>
5 #include <stdarg.h>
6 #include <string.h>
7 #include <math.h>
8 #include <assert.h>
9 #include <math.h>
10 #include <time.h>
11 #include <limits.h>
12
13 #include <GL/glew.h>
14 #include <GLFW/glfw3.h>
15
16 #define NK_PRIVATE
17 #define NK_INCLUDE_FIXED_TYPES
18 #define NK_INCLUDE_STANDARD_IO
19 #define NK_INCLUDE_DEFAULT_ALLOCATOR
20 #define NK_INCLUDE_VERTEX_BUFFER_OUTPUT
21 #define NK_INCLUDE_FONT_BAKING
22 #define NK_INCLUDE_DEFAULT_FONT
23 #define NK_IMPLEMENTATION
24 #include "../nuklear.h"
25
26 #define STB_IMAGE_IMPLEMENTATION
27 #include "stb_image.h"
28
29 /* macros */
30 #define WINDOW_WIDTH 1200
31 #define WINDOW_HEIGHT 800
32
33 #define MAX_VERTEX_MEMORY 512 * 1024
34 #define MAX_ELEMENT_MEMORY 128 * 1024
35
36 #define UNUSED(a) (void)a
37 #define MIN(a,b) ((a) < (b) ? (a) : (b))
38 #define MAX(a,b) ((a) < (b) ? (b) : (a))
39 #define LEN(a) (sizeof(a)/sizeof(a)[0])
40
41 #define NK_SHADER_VERSION "#version 150\n"
42
43 /* ===============================================================
44 *
45 * DEVICE
46 *
47 * ===============================================================*/
48 struct nk_glfw_vertex {
49 float position[2];
50 float uv[2];
51 nk_byte col[4];
52 };
53
54 struct device {
55 struct nk_buffer cmds;
56 struct nk_draw_null_texture null;
57 GLuint vbo, vao, ebo;
58 GLuint prog;
59 GLuint vert_shdr;
60 GLuint frag_shdr;
61 GLint attrib_pos;
62 GLint attrib_uv;
63 GLint attrib_col;
64 GLint uniform_tex;
65 GLint uniform_proj;
66 GLuint font_tex;
67 };
68
69 static void
die(const char * fmt,...)70 die(const char *fmt, ...)
71 {
72 va_list ap;
73 va_start(ap, fmt);
74 vfprintf(stderr, fmt, ap);
75 va_end(ap);
76 fputs("\n", stderr);
77 exit(EXIT_FAILURE);
78 }
79
80 static struct nk_image
icon_load(const char * filename)81 icon_load(const char *filename)
82 {
83 int x,y,n;
84 GLuint tex;
85 unsigned char *data = stbi_load(filename, &x, &y, &n, 0);
86 if (!data) die("[SDL]: failed to load image: %s", filename);
87
88 glGenTextures(1, &tex);
89 glBindTexture(GL_TEXTURE_2D, tex);
90 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
91 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_NEAREST);
92 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
93 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
94 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, x, y, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
95 glGenerateMipmap(GL_TEXTURE_2D);
96 stbi_image_free(data);
97 return nk_image_id((int)tex);
98 }
99
100 static void
device_init(struct device * dev)101 device_init(struct device *dev)
102 {
103 GLint status;
104 static const GLchar *vertex_shader =
105 NK_SHADER_VERSION
106 "uniform mat4 ProjMtx;\n"
107 "in vec2 Position;\n"
108 "in vec2 TexCoord;\n"
109 "in vec4 Color;\n"
110 "out vec2 Frag_UV;\n"
111 "out vec4 Frag_Color;\n"
112 "void main() {\n"
113 " Frag_UV = TexCoord;\n"
114 " Frag_Color = Color;\n"
115 " gl_Position = ProjMtx * vec4(Position.xy, 0, 1);\n"
116 "}\n";
117 static const GLchar *fragment_shader =
118 NK_SHADER_VERSION
119 "precision mediump float;\n"
120 "uniform sampler2D Texture;\n"
121 "in vec2 Frag_UV;\n"
122 "in vec4 Frag_Color;\n"
123 "out vec4 Out_Color;\n"
124 "void main(){\n"
125 " Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
126 "}\n";
127
128 nk_buffer_init_default(&dev->cmds);
129 dev->prog = glCreateProgram();
130 dev->vert_shdr = glCreateShader(GL_VERTEX_SHADER);
131 dev->frag_shdr = glCreateShader(GL_FRAGMENT_SHADER);
132 glShaderSource(dev->vert_shdr, 1, &vertex_shader, 0);
133 glShaderSource(dev->frag_shdr, 1, &fragment_shader, 0);
134 glCompileShader(dev->vert_shdr);
135 glCompileShader(dev->frag_shdr);
136 glGetShaderiv(dev->vert_shdr, GL_COMPILE_STATUS, &status);
137 assert(status == GL_TRUE);
138 glGetShaderiv(dev->frag_shdr, GL_COMPILE_STATUS, &status);
139 assert(status == GL_TRUE);
140 glAttachShader(dev->prog, dev->vert_shdr);
141 glAttachShader(dev->prog, dev->frag_shdr);
142 glLinkProgram(dev->prog);
143 glGetProgramiv(dev->prog, GL_LINK_STATUS, &status);
144 assert(status == GL_TRUE);
145
146 dev->uniform_tex = glGetUniformLocation(dev->prog, "Texture");
147 dev->uniform_proj = glGetUniformLocation(dev->prog, "ProjMtx");
148 dev->attrib_pos = glGetAttribLocation(dev->prog, "Position");
149 dev->attrib_uv = glGetAttribLocation(dev->prog, "TexCoord");
150 dev->attrib_col = glGetAttribLocation(dev->prog, "Color");
151
152 {
153 /* buffer setup */
154 GLsizei vs = sizeof(struct nk_glfw_vertex);
155 size_t vp = offsetof(struct nk_glfw_vertex, position);
156 size_t vt = offsetof(struct nk_glfw_vertex, uv);
157 size_t vc = offsetof(struct nk_glfw_vertex, col);
158
159 glGenBuffers(1, &dev->vbo);
160 glGenBuffers(1, &dev->ebo);
161 glGenVertexArrays(1, &dev->vao);
162
163 glBindVertexArray(dev->vao);
164 glBindBuffer(GL_ARRAY_BUFFER, dev->vbo);
165 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, dev->ebo);
166
167 glEnableVertexAttribArray((GLuint)dev->attrib_pos);
168 glEnableVertexAttribArray((GLuint)dev->attrib_uv);
169 glEnableVertexAttribArray((GLuint)dev->attrib_col);
170
171 glVertexAttribPointer((GLuint)dev->attrib_pos, 2, GL_FLOAT, GL_FALSE, vs, (void*)vp);
172 glVertexAttribPointer((GLuint)dev->attrib_uv, 2, GL_FLOAT, GL_FALSE, vs, (void*)vt);
173 glVertexAttribPointer((GLuint)dev->attrib_col, 4, GL_UNSIGNED_BYTE, GL_TRUE, vs, (void*)vc);
174 }
175
176 glBindTexture(GL_TEXTURE_2D, 0);
177 glBindBuffer(GL_ARRAY_BUFFER, 0);
178 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
179 glBindVertexArray(0);
180 }
181
182 static void
device_upload_atlas(struct device * dev,const void * image,int width,int height)183 device_upload_atlas(struct device *dev, const void *image, int width, int height)
184 {
185 glGenTextures(1, &dev->font_tex);
186 glBindTexture(GL_TEXTURE_2D, dev->font_tex);
187 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
188 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
189 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (GLsizei)width, (GLsizei)height, 0,
190 GL_RGBA, GL_UNSIGNED_BYTE, image);
191 }
192
193 static void
device_shutdown(struct device * dev)194 device_shutdown(struct device *dev)
195 {
196 glDetachShader(dev->prog, dev->vert_shdr);
197 glDetachShader(dev->prog, dev->frag_shdr);
198 glDeleteShader(dev->vert_shdr);
199 glDeleteShader(dev->frag_shdr);
200 glDeleteProgram(dev->prog);
201 glDeleteTextures(1, &dev->font_tex);
202 glDeleteBuffers(1, &dev->vbo);
203 glDeleteBuffers(1, &dev->ebo);
204 nk_buffer_free(&dev->cmds);
205 }
206
207 static void
device_draw(struct device * dev,struct nk_context * ctx,int width,int height,enum nk_anti_aliasing AA)208 device_draw(struct device *dev, struct nk_context *ctx, int width, int height,
209 enum nk_anti_aliasing AA)
210 {
211 GLfloat ortho[4][4] = {
212 {2.0f, 0.0f, 0.0f, 0.0f},
213 {0.0f,-2.0f, 0.0f, 0.0f},
214 {0.0f, 0.0f,-1.0f, 0.0f},
215 {-1.0f,1.0f, 0.0f, 1.0f},
216 };
217 ortho[0][0] /= (GLfloat)width;
218 ortho[1][1] /= (GLfloat)height;
219
220 /* setup global state */
221 glEnable(GL_BLEND);
222 glBlendEquation(GL_FUNC_ADD);
223 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
224 glDisable(GL_CULL_FACE);
225 glDisable(GL_DEPTH_TEST);
226 glEnable(GL_SCISSOR_TEST);
227 glActiveTexture(GL_TEXTURE0);
228
229 /* setup program */
230 glUseProgram(dev->prog);
231 glUniform1i(dev->uniform_tex, 0);
232 glUniformMatrix4fv(dev->uniform_proj, 1, GL_FALSE, &ortho[0][0]);
233 {
234 /* convert from command queue into draw list and draw to screen */
235 const struct nk_draw_command *cmd;
236 void *vertices, *elements;
237 const nk_draw_index *offset = NULL;
238
239 /* allocate vertex and element buffer */
240 glBindVertexArray(dev->vao);
241 glBindBuffer(GL_ARRAY_BUFFER, dev->vbo);
242 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, dev->ebo);
243
244 glBufferData(GL_ARRAY_BUFFER, MAX_VERTEX_MEMORY, NULL, GL_STREAM_DRAW);
245 glBufferData(GL_ELEMENT_ARRAY_BUFFER, MAX_ELEMENT_MEMORY, NULL, GL_STREAM_DRAW);
246
247 /* load draw vertices & elements directly into vertex + element buffer */
248 vertices = glMapBuffer(GL_ARRAY_BUFFER, GL_WRITE_ONLY);
249 elements = glMapBuffer(GL_ELEMENT_ARRAY_BUFFER, GL_WRITE_ONLY);
250 {
251 /* fill convert configuration */
252 struct nk_convert_config config;
253 static const struct nk_draw_vertex_layout_element vertex_layout[] = {
254 {NK_VERTEX_POSITION, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_glfw_vertex, position)},
255 {NK_VERTEX_TEXCOORD, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_glfw_vertex, uv)},
256 {NK_VERTEX_COLOR, NK_FORMAT_R8G8B8A8, NK_OFFSETOF(struct nk_glfw_vertex, col)},
257 {NK_VERTEX_LAYOUT_END}
258 };
259 NK_MEMSET(&config, 0, sizeof(config));
260 config.vertex_layout = vertex_layout;
261 config.vertex_size = sizeof(struct nk_glfw_vertex);
262 config.vertex_alignment = NK_ALIGNOF(struct nk_glfw_vertex);
263 config.null = dev->null;
264 config.circle_segment_count = 22;
265 config.curve_segment_count = 22;
266 config.arc_segment_count = 22;
267 config.global_alpha = 1.0f;
268 config.shape_AA = AA;
269 config.line_AA = AA;
270
271 /* setup buffers to load vertices and elements */
272 {struct nk_buffer vbuf, ebuf;
273 nk_buffer_init_fixed(&vbuf, vertices, MAX_VERTEX_MEMORY);
274 nk_buffer_init_fixed(&ebuf, elements, MAX_ELEMENT_MEMORY);
275 nk_convert(ctx, &dev->cmds, &vbuf, &ebuf, &config);}
276 }
277 glUnmapBuffer(GL_ARRAY_BUFFER);
278 glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);
279
280 /* iterate over and execute each draw command */
281 nk_draw_foreach(cmd, ctx, &dev->cmds)
282 {
283 if (!cmd->elem_count) continue;
284 glBindTexture(GL_TEXTURE_2D, (GLuint)cmd->texture.id);
285 glScissor(
286 (GLint)(cmd->clip_rect.x),
287 (GLint)((height - (GLint)(cmd->clip_rect.y + cmd->clip_rect.h))),
288 (GLint)(cmd->clip_rect.w),
289 (GLint)(cmd->clip_rect.h));
290 glDrawElements(GL_TRIANGLES, (GLsizei)cmd->elem_count, GL_UNSIGNED_SHORT, offset);
291 offset += cmd->elem_count;
292 }
293 nk_clear(ctx);
294 }
295
296 /* default OpenGL state */
297 glUseProgram(0);
298 glBindBuffer(GL_ARRAY_BUFFER, 0);
299 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
300 glBindVertexArray(0);
301 glDisable(GL_BLEND);
302 glDisable(GL_SCISSOR_TEST);
303 }
304
305 /* glfw callbacks (I don't know if there is a easier way to access text and scroll )*/
error_callback(int e,const char * d)306 static void error_callback(int e, const char *d){printf("Error %d: %s\n", e, d);}
text_input(GLFWwindow * win,unsigned int codepoint)307 static void text_input(GLFWwindow *win, unsigned int codepoint)
308 {nk_input_unicode((struct nk_context*)glfwGetWindowUserPointer(win), codepoint);}
scroll_input(GLFWwindow * win,double _,double yoff)309 static void scroll_input(GLFWwindow *win, double _, double yoff)
310 {UNUSED(_);nk_input_scroll((struct nk_context*)glfwGetWindowUserPointer(win), nk_vec2(0, (float)yoff));}
311
312 static void
pump_input(struct nk_context * ctx,GLFWwindow * win)313 pump_input(struct nk_context *ctx, GLFWwindow *win)
314 {
315 double x, y;
316 nk_input_begin(ctx);
317 glfwPollEvents();
318
319 nk_input_key(ctx, NK_KEY_DEL, glfwGetKey(win, GLFW_KEY_DELETE) == GLFW_PRESS);
320 nk_input_key(ctx, NK_KEY_ENTER, glfwGetKey(win, GLFW_KEY_ENTER) == GLFW_PRESS);
321 nk_input_key(ctx, NK_KEY_TAB, glfwGetKey(win, GLFW_KEY_TAB) == GLFW_PRESS);
322 nk_input_key(ctx, NK_KEY_BACKSPACE, glfwGetKey(win, GLFW_KEY_BACKSPACE) == GLFW_PRESS);
323 nk_input_key(ctx, NK_KEY_LEFT, glfwGetKey(win, GLFW_KEY_LEFT) == GLFW_PRESS);
324 nk_input_key(ctx, NK_KEY_RIGHT, glfwGetKey(win, GLFW_KEY_RIGHT) == GLFW_PRESS);
325 nk_input_key(ctx, NK_KEY_UP, glfwGetKey(win, GLFW_KEY_UP) == GLFW_PRESS);
326 nk_input_key(ctx, NK_KEY_DOWN, glfwGetKey(win, GLFW_KEY_DOWN) == GLFW_PRESS);
327
328 if (glfwGetKey(win, GLFW_KEY_LEFT_CONTROL) == GLFW_PRESS ||
329 glfwGetKey(win, GLFW_KEY_RIGHT_CONTROL) == GLFW_PRESS) {
330 nk_input_key(ctx, NK_KEY_COPY, glfwGetKey(win, GLFW_KEY_C) == GLFW_PRESS);
331 nk_input_key(ctx, NK_KEY_PASTE, glfwGetKey(win, GLFW_KEY_P) == GLFW_PRESS);
332 nk_input_key(ctx, NK_KEY_CUT, glfwGetKey(win, GLFW_KEY_X) == GLFW_PRESS);
333 nk_input_key(ctx, NK_KEY_CUT, glfwGetKey(win, GLFW_KEY_E) == GLFW_PRESS);
334 nk_input_key(ctx, NK_KEY_SHIFT, 1);
335 } else {
336 nk_input_key(ctx, NK_KEY_COPY, 0);
337 nk_input_key(ctx, NK_KEY_PASTE, 0);
338 nk_input_key(ctx, NK_KEY_CUT, 0);
339 nk_input_key(ctx, NK_KEY_SHIFT, 0);
340 }
341
342 glfwGetCursorPos(win, &x, &y);
343 nk_input_motion(ctx, (int)x, (int)y);
344 nk_input_button(ctx, NK_BUTTON_LEFT, (int)x, (int)y, glfwGetMouseButton(win, GLFW_MOUSE_BUTTON_LEFT) == GLFW_PRESS);
345 nk_input_button(ctx, NK_BUTTON_MIDDLE, (int)x, (int)y, glfwGetMouseButton(win, GLFW_MOUSE_BUTTON_MIDDLE) == GLFW_PRESS);
346 nk_input_button(ctx, NK_BUTTON_RIGHT, (int)x, (int)y, glfwGetMouseButton(win, GLFW_MOUSE_BUTTON_RIGHT) == GLFW_PRESS);
347 nk_input_end(ctx);
348 }
349
350 struct nk_canvas {
351 struct nk_command_buffer *painter;
352 struct nk_vec2 item_spacing;
353 struct nk_vec2 panel_padding;
354 struct nk_style_item window_background;
355 };
356
357 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)358 canvas_begin(struct nk_context *ctx, struct nk_canvas *canvas, nk_flags flags,
359 int x, int y, int width, int height, struct nk_color background_color)
360 {
361 /* save style properties which will be overwritten */
362 canvas->panel_padding = ctx->style.window.padding;
363 canvas->item_spacing = ctx->style.window.spacing;
364 canvas->window_background = ctx->style.window.fixed_background;
365
366 /* use the complete window space and set background */
367 ctx->style.window.spacing = nk_vec2(0,0);
368 ctx->style.window.padding = nk_vec2(0,0);
369 ctx->style.window.fixed_background = nk_style_item_color(background_color);
370
371 /* create/update window and set position + size */
372 flags = flags & ~NK_WINDOW_DYNAMIC;
373 nk_window_set_bounds(ctx, "Window", nk_rect(x, y, width, height));
374 nk_begin(ctx, "Window", nk_rect(x, y, width, height), NK_WINDOW_NO_SCROLLBAR|flags);
375
376 /* allocate the complete window space for drawing */
377 {struct nk_rect total_space;
378 total_space = nk_window_get_content_region(ctx);
379 nk_layout_row_dynamic(ctx, total_space.h, 1);
380 nk_widget(&total_space, ctx);
381 canvas->painter = nk_window_get_canvas(ctx);}
382 }
383
384 static void
canvas_end(struct nk_context * ctx,struct nk_canvas * canvas)385 canvas_end(struct nk_context *ctx, struct nk_canvas *canvas)
386 {
387 nk_end(ctx);
388 ctx->style.window.spacing = canvas->panel_padding;
389 ctx->style.window.padding = canvas->item_spacing;
390 ctx->style.window.fixed_background = canvas->window_background;
391 }
392
main(int argc,char * argv[])393 int main(int argc, char *argv[])
394 {
395 /* Platform */
396 static GLFWwindow *win;
397 int width = 0, height = 0;
398
399 /* GUI */
400 struct device device;
401 struct nk_font_atlas atlas;
402 struct nk_context ctx;
403
404 /* GLFW */
405 glfwSetErrorCallback(error_callback);
406 if (!glfwInit()) {
407 fprintf(stdout, "[GFLW] failed to init!\n");
408 exit(1);
409 }
410 glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
411 glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
412 glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
413 win = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "Demo", NULL, NULL);
414 glfwMakeContextCurrent(win);
415 glfwSetWindowUserPointer(win, &ctx);
416 glfwSetCharCallback(win, text_input);
417 glfwSetScrollCallback(win, scroll_input);
418 glfwGetWindowSize(win, &width, &height);
419
420 /* OpenGL */
421 glViewport(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT);
422 glewExperimental = 1;
423 if (glewInit() != GLEW_OK) {
424 fprintf(stderr, "Failed to setup GLEW\n");
425 exit(1);
426 }
427
428 /* GUI */
429 {device_init(&device);
430 {const void *image; int w, h;
431 struct nk_font *font;
432 nk_font_atlas_init_default(&atlas);
433 nk_font_atlas_begin(&atlas);
434 font = nk_font_atlas_add_default(&atlas, 13, 0);
435 image = nk_font_atlas_bake(&atlas, &w, &h, NK_FONT_ATLAS_RGBA32);
436 device_upload_atlas(&device, image, w, h);
437 nk_font_atlas_end(&atlas, nk_handle_id((int)device.font_tex), &device.null);
438 nk_init_default(&ctx, &font->handle);
439
440 glEnable(GL_TEXTURE_2D);
441 while (!glfwWindowShouldClose(win))
442 {
443 /* input */
444 pump_input(&ctx, win);
445
446 /* draw */
447 {struct nk_canvas canvas;
448 canvas_begin(&ctx, &canvas, 0, 0, 0, width, height, nk_rgb(250,250,250));
449 {
450 nk_fill_rect(canvas.painter, nk_rect(15,15,210,210), 5, nk_rgb(247, 230, 154));
451 nk_fill_rect(canvas.painter, nk_rect(20,20,200,200), 5, nk_rgb(188, 174, 118));
452 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));
453 nk_fill_rect(canvas.painter, nk_rect(250,20,100,100), 0, nk_rgb(0,0,255));
454 nk_fill_circle(canvas.painter, nk_rect(20,250,100,100), nk_rgb(255,0,0));
455 nk_fill_triangle(canvas.painter, 250, 250, 350, 250, 300, 350, nk_rgb(0,255,0));
456 nk_fill_arc(canvas.painter, 300, 180, 50, 0, 3.141592654f * 3.0f / 4.0f, nk_rgb(255,255,0));
457
458 {float points[12];
459 points[0] = 200; points[1] = 250;
460 points[2] = 250; points[3] = 350;
461 points[4] = 225; points[5] = 350;
462 points[6] = 200; points[7] = 300;
463 points[8] = 175; points[9] = 350;
464 points[10] = 150; points[11] = 350;
465 nk_fill_polygon(canvas.painter, points, 6, nk_rgb(0,0,0));}
466
467 nk_stroke_line(canvas.painter, 15, 10, 200, 10, 2.0f, nk_rgb(189,45,75));
468 nk_stroke_rect(canvas.painter, nk_rect(370, 20, 100, 100), 10, 3, nk_rgb(0,0,255));
469 nk_stroke_curve(canvas.painter, 380, 200, 405, 270, 455, 120, 480, 200, 2, nk_rgb(0,150,220));
470 nk_stroke_circle(canvas.painter, nk_rect(20, 370, 100, 100), 5, nk_rgb(0,255,120));
471 nk_stroke_triangle(canvas.painter, 370, 250, 470, 250, 420, 350, 6, nk_rgb(255,0,143));
472 }
473 canvas_end(&ctx, &canvas);}
474
475 /* Draw */
476 glfwGetWindowSize(win, &width, &height);
477 glViewport(0, 0, width, height);
478 glClear(GL_COLOR_BUFFER_BIT);
479 glClearColor(0.2f, 0.2f, 0.2f, 1.0f);
480 device_draw(&device, &ctx, width, height, NK_ANTI_ALIASING_ON);
481 glfwSwapBuffers(win);
482 }}}
483 nk_font_atlas_clear(&atlas);
484 nk_free(&ctx);
485 device_shutdown(&device);
486 glfwTerminate();
487 return 0;
488 }
489
490