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cpputils / deps / glfw / deps / nuklear_glfw_gl2.h
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1/*
2 * Nuklear - v1.32.0 - public domain
3 * no warrenty implied; use at your own risk.
4 * authored from 2015-2017 by Micha Mettke
5 */
6/*
7 * ==============================================================
8 *
9 * API
10 *
11 * ===============================================================
12 */
13#ifndef NK_GLFW_GL2_H_
14#define NK_GLFW_GL2_H_
15
16#include <GLFW/glfw3.h>
17
18enum nk_glfw_init_state{
19 NK_GLFW3_DEFAULT = 0,
20 NK_GLFW3_INSTALL_CALLBACKS
21};
22NK_API struct nk_context* nk_glfw3_init(GLFWwindow *win, enum nk_glfw_init_state);
23NK_API void nk_glfw3_font_stash_begin(struct nk_font_atlas **atlas);
24NK_API void nk_glfw3_font_stash_end(void);
25
26NK_API void nk_glfw3_new_frame(void);
27NK_API void nk_glfw3_render(enum nk_anti_aliasing);
28NK_API void nk_glfw3_shutdown(void);
29
30NK_API void nk_glfw3_char_callback(GLFWwindow *win, unsigned int codepoint);
31NK_API void nk_gflw3_scroll_callback(GLFWwindow *win, double xoff, double yoff);
32
33#endif
34
35/*
36 * ==============================================================
37 *
38 * IMPLEMENTATION
39 *
40 * ===============================================================
41 */
42#ifdef NK_GLFW_GL2_IMPLEMENTATION
43
44#ifndef NK_GLFW_TEXT_MAX
45#define NK_GLFW_TEXT_MAX 256
46#endif
47#ifndef NK_GLFW_DOUBLE_CLICK_LO
48#define NK_GLFW_DOUBLE_CLICK_LO 0.02
49#endif
50#ifndef NK_GLFW_DOUBLE_CLICK_HI
51#define NK_GLFW_DOUBLE_CLICK_HI 0.2
52#endif
53
54struct nk_glfw_device {
55 struct nk_buffer cmds;
56 struct nk_draw_null_texture null;
57 GLuint font_tex;
58};
59
60struct nk_glfw_vertex {
61 float position[2];
62 float uv[2];
63 nk_byte col[4];
64};
65
66static struct nk_glfw {
67 GLFWwindow *win;
68 int width, height;
69 int display_width, display_height;
70 struct nk_glfw_device ogl;
71 struct nk_context ctx;
72 struct nk_font_atlas atlas;
73 struct nk_vec2 fb_scale;
74 unsigned int text[NK_GLFW_TEXT_MAX];
75 int text_len;
76 struct nk_vec2 scroll;
77 double last_button_click;
78 int is_double_click_down;
79 struct nk_vec2 double_click_pos;
80} glfw;
81
82NK_INTERN void
83nk_glfw3_device_upload_atlas(const void *image, int width, int height)
84{
85 struct nk_glfw_device *dev = &glfw.ogl;
86 glGenTextures(1, &dev->font_tex);
87 glBindTexture(GL_TEXTURE_2D, dev->font_tex);
88 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
89 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
90 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (GLsizei)width, (GLsizei)height, 0,
91 GL_RGBA, GL_UNSIGNED_BYTE, image);
92}
93
94NK_API void
95nk_glfw3_render(enum nk_anti_aliasing AA)
96{
97 /* setup global state */
98 struct nk_glfw_device *dev = &glfw.ogl;
99 glPushAttrib(GL_ENABLE_BIT|GL_COLOR_BUFFER_BIT|GL_TRANSFORM_BIT);
100 glDisable(GL_CULL_FACE);
101 glDisable(GL_DEPTH_TEST);
102 glEnable(GL_SCISSOR_TEST);
103 glEnable(GL_BLEND);
104 glEnable(GL_TEXTURE_2D);
105 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
106
107 /* setup viewport/project */
108 glViewport(0,0,(GLsizei)glfw.display_width,(GLsizei)glfw.display_height);
109 glMatrixMode(GL_PROJECTION);
110 glPushMatrix();
111 glLoadIdentity();
112 glOrtho(0.0f, glfw.width, glfw.height, 0.0f, -1.0f, 1.0f);
113 glMatrixMode(GL_MODELVIEW);
114 glPushMatrix();
115 glLoadIdentity();
116
117 glEnableClientState(GL_VERTEX_ARRAY);
118 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
119 glEnableClientState(GL_COLOR_ARRAY);
120 {
121 GLsizei vs = sizeof(struct nk_glfw_vertex);
122 size_t vp = offsetof(struct nk_glfw_vertex, position);
123 size_t vt = offsetof(struct nk_glfw_vertex, uv);
124 size_t vc = offsetof(struct nk_glfw_vertex, col);
125
126 /* convert from command queue into draw list and draw to screen */
127 const struct nk_draw_command *cmd;
128 const nk_draw_index *offset = NULL;
129 struct nk_buffer vbuf, ebuf;
130
131 /* fill convert configuration */
132 struct nk_convert_config config;
133 static const struct nk_draw_vertex_layout_element vertex_layout[] = {
134 {NK_VERTEX_POSITION, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_glfw_vertex, position)},
135 {NK_VERTEX_TEXCOORD, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_glfw_vertex, uv)},
136 {NK_VERTEX_COLOR, NK_FORMAT_R8G8B8A8, NK_OFFSETOF(struct nk_glfw_vertex, col)},
137 {NK_VERTEX_LAYOUT_END}
138 };
139 NK_MEMSET(&config, 0, sizeof(config));
140 config.vertex_layout = vertex_layout;
141 config.vertex_size = sizeof(struct nk_glfw_vertex);
142 config.vertex_alignment = NK_ALIGNOF(struct nk_glfw_vertex);
143 config.null = dev->null;
144 config.circle_segment_count = 22;
145 config.curve_segment_count = 22;
146 config.arc_segment_count = 22;
147 config.global_alpha = 1.0f;
148 config.shape_AA = AA;
149 config.line_AA = AA;
150
151 /* convert shapes into vertexes */
152 nk_buffer_init_default(&vbuf);
153 nk_buffer_init_default(&ebuf);
154 nk_convert(&glfw.ctx, &dev->cmds, &vbuf, &ebuf, &config);
155
156 /* setup vertex buffer pointer */
157 {const void *vertices = nk_buffer_memory_const(&vbuf);
158 glVertexPointer(2, GL_FLOAT, vs, (const void*)((const nk_byte*)vertices + vp));
159 glTexCoordPointer(2, GL_FLOAT, vs, (const void*)((const nk_byte*)vertices + vt));
160 glColorPointer(4, GL_UNSIGNED_BYTE, vs, (const void*)((const nk_byte*)vertices + vc));}
161
162 /* iterate over and execute each draw command */
163 offset = (const nk_draw_index*)nk_buffer_memory_const(&ebuf);
164 nk_draw_foreach(cmd, &glfw.ctx, &dev->cmds)
165 {
166 if (!cmd->elem_count) continue;
167 glBindTexture(GL_TEXTURE_2D, (GLuint)cmd->texture.id);
168 glScissor(
169 (GLint)(cmd->clip_rect.x * glfw.fb_scale.x),
170 (GLint)((glfw.height - (GLint)(cmd->clip_rect.y + cmd->clip_rect.h)) * glfw.fb_scale.y),
171 (GLint)(cmd->clip_rect.w * glfw.fb_scale.x),
172 (GLint)(cmd->clip_rect.h * glfw.fb_scale.y));
173 glDrawElements(GL_TRIANGLES, (GLsizei)cmd->elem_count, GL_UNSIGNED_SHORT, offset);
174 offset += cmd->elem_count;
175 }
176 nk_clear(&glfw.ctx);
177 nk_buffer_free(&vbuf);
178 nk_buffer_free(&ebuf);
179 }
180
181 /* default OpenGL state */
182 glDisableClientState(GL_VERTEX_ARRAY);
183 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
184 glDisableClientState(GL_COLOR_ARRAY);
185
186 glDisable(GL_CULL_FACE);
187 glDisable(GL_DEPTH_TEST);
188 glDisable(GL_SCISSOR_TEST);
189 glDisable(GL_BLEND);
190 glDisable(GL_TEXTURE_2D);
191
192 glBindTexture(GL_TEXTURE_2D, 0);
193 glMatrixMode(GL_MODELVIEW);
194 glPopMatrix();
195 glMatrixMode(GL_PROJECTION);
196 glPopMatrix();
197 glPopAttrib();
198}
199
200NK_API void
201nk_glfw3_char_callback(GLFWwindow *win, unsigned int codepoint)
202{
203 (void)win;
204 if (glfw.text_len < NK_GLFW_TEXT_MAX)
205 glfw.text[glfw.text_len++] = codepoint;
206}
207
208NK_API void
209nk_gflw3_scroll_callback(GLFWwindow *win, double xoff, double yoff)
210{
211 (void)win; (void)xoff;
212 glfw.scroll.x += (float)xoff;
213 glfw.scroll.y += (float)yoff;
214}
215
216NK_API void
217nk_glfw3_mouse_button_callback(GLFWwindow* window, int button, int action, int mods)
218{
219 double x, y;
220 if (button != GLFW_MOUSE_BUTTON_LEFT) return;
221 glfwGetCursorPos(window, &x, &y);
222 if (action == GLFW_PRESS) {
223 double dt = glfwGetTime() - glfw.last_button_click;
224 if (dt > NK_GLFW_DOUBLE_CLICK_LO && dt < NK_GLFW_DOUBLE_CLICK_HI) {
225 glfw.is_double_click_down = nk_true;
226 glfw.double_click_pos = nk_vec2((float)x, (float)y);
227 }
228 glfw.last_button_click = glfwGetTime();
229 } else glfw.is_double_click_down = nk_false;
230}
231
232NK_INTERN void
233nk_glfw3_clipbard_paste(nk_handle usr, struct nk_text_edit *edit)
234{
235 const char *text = glfwGetClipboardString(glfw.win);
236 if (text) nk_textedit_paste(edit, text, nk_strlen(text));
237 (void)usr;
238}
239
240NK_INTERN void
241nk_glfw3_clipbard_copy(nk_handle usr, const char *text, int len)
242{
243 char *str = 0;
244 (void)usr;
245 if (!len) return;
246 str = (char*)malloc((size_t)len+1);
247 if (!str) return;
248 NK_MEMCPY(str, text, (size_t)len);
249 str[len] = '\0';
250 glfwSetClipboardString(glfw.win, str);
251 free(str);
252}
253
254NK_API struct nk_context*
255nk_glfw3_init(GLFWwindow *win, enum nk_glfw_init_state init_state)
256{
257 glfw.win = win;
258 if (init_state == NK_GLFW3_INSTALL_CALLBACKS) {
259 glfwSetScrollCallback(win, nk_gflw3_scroll_callback);
260 glfwSetCharCallback(win, nk_glfw3_char_callback);
261 glfwSetMouseButtonCallback(win, nk_glfw3_mouse_button_callback);
262 }
263 nk_init_default(&glfw.ctx, 0);
264 glfw.ctx.clip.copy = nk_glfw3_clipbard_copy;
265 glfw.ctx.clip.paste = nk_glfw3_clipbard_paste;
266 glfw.ctx.clip.userdata = nk_handle_ptr(0);
267 nk_buffer_init_default(&glfw.ogl.cmds);
268
269 glfw.is_double_click_down = nk_false;
270 glfw.double_click_pos = nk_vec2(0, 0);
271
272 return &glfw.ctx;
273}
274
275NK_API void
276nk_glfw3_font_stash_begin(struct nk_font_atlas **atlas)
277{
278 nk_font_atlas_init_default(&glfw.atlas);
279 nk_font_atlas_begin(&glfw.atlas);
280 *atlas = &glfw.atlas;
281}
282
283NK_API void
284nk_glfw3_font_stash_end(void)
285{
286 const void *image; int w, h;
287 image = nk_font_atlas_bake(&glfw.atlas, &w, &h, NK_FONT_ATLAS_RGBA32);
288 nk_glfw3_device_upload_atlas(image, w, h);
289 nk_font_atlas_end(&glfw.atlas, nk_handle_id((int)glfw.ogl.font_tex), &glfw.ogl.null);
290 if (glfw.atlas.default_font)
291 nk_style_set_font(&glfw.ctx, &glfw.atlas.default_font->handle);
292}
293
294NK_API void
295nk_glfw3_new_frame(void)
296{
297 int i;
298 double x, y;
299 struct nk_context *ctx = &glfw.ctx;
300 struct GLFWwindow *win = glfw.win;
301
302 glfwGetWindowSize(win, &glfw.width, &glfw.height);
303 glfwGetFramebufferSize(win, &glfw.display_width, &glfw.display_height);
304 glfw.fb_scale.x = (float)glfw.display_width/(float)glfw.width;
305 glfw.fb_scale.y = (float)glfw.display_height/(float)glfw.height;
306
307 nk_input_begin(ctx);
308 for (i = 0; i < glfw.text_len; ++i)
309 nk_input_unicode(ctx, glfw.text[i]);
310
311 /* optional grabbing behavior */
312 if (ctx->input.mouse.grab)
313 glfwSetInputMode(glfw.win, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
314 else if (ctx->input.mouse.ungrab)
315 glfwSetInputMode(glfw.win, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
316
317 nk_input_key(ctx, NK_KEY_DEL, glfwGetKey(win, GLFW_KEY_DELETE) == GLFW_PRESS);
318 nk_input_key(ctx, NK_KEY_ENTER, glfwGetKey(win, GLFW_KEY_ENTER) == GLFW_PRESS);
319 nk_input_key(ctx, NK_KEY_TAB, glfwGetKey(win, GLFW_KEY_TAB) == GLFW_PRESS);
320 nk_input_key(ctx, NK_KEY_BACKSPACE, glfwGetKey(win, GLFW_KEY_BACKSPACE) == GLFW_PRESS);
321 nk_input_key(ctx, NK_KEY_UP, glfwGetKey(win, GLFW_KEY_UP) == GLFW_PRESS);
322 nk_input_key(ctx, NK_KEY_DOWN, glfwGetKey(win, GLFW_KEY_DOWN) == GLFW_PRESS);
323 nk_input_key(ctx, NK_KEY_TEXT_START, glfwGetKey(win, GLFW_KEY_HOME) == GLFW_PRESS);
324 nk_input_key(ctx, NK_KEY_TEXT_END, glfwGetKey(win, GLFW_KEY_END) == GLFW_PRESS);
325 nk_input_key(ctx, NK_KEY_SCROLL_START, glfwGetKey(win, GLFW_KEY_HOME) == GLFW_PRESS);
326 nk_input_key(ctx, NK_KEY_SCROLL_END, glfwGetKey(win, GLFW_KEY_END) == GLFW_PRESS);
327 nk_input_key(ctx, NK_KEY_SCROLL_DOWN, glfwGetKey(win, GLFW_KEY_PAGE_DOWN) == GLFW_PRESS);
328 nk_input_key(ctx, NK_KEY_SCROLL_UP, glfwGetKey(win, GLFW_KEY_PAGE_UP) == GLFW_PRESS);
329 nk_input_key(ctx, NK_KEY_SHIFT, glfwGetKey(win, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS||
330 glfwGetKey(win, GLFW_KEY_RIGHT_SHIFT) == GLFW_PRESS);
331
332 if (glfwGetKey(win, GLFW_KEY_LEFT_CONTROL) == GLFW_PRESS ||
333 glfwGetKey(win, GLFW_KEY_RIGHT_CONTROL) == GLFW_PRESS) {
334 nk_input_key(ctx, NK_KEY_COPY, glfwGetKey(win, GLFW_KEY_C) == GLFW_PRESS);
335 nk_input_key(ctx, NK_KEY_PASTE, glfwGetKey(win, GLFW_KEY_V) == GLFW_PRESS);
336 nk_input_key(ctx, NK_KEY_CUT, glfwGetKey(win, GLFW_KEY_X) == GLFW_PRESS);
337 nk_input_key(ctx, NK_KEY_TEXT_UNDO, glfwGetKey(win, GLFW_KEY_Z) == GLFW_PRESS);
338 nk_input_key(ctx, NK_KEY_TEXT_REDO, glfwGetKey(win, GLFW_KEY_R) == GLFW_PRESS);
339 nk_input_key(ctx, NK_KEY_TEXT_WORD_LEFT, glfwGetKey(win, GLFW_KEY_LEFT) == GLFW_PRESS);
340 nk_input_key(ctx, NK_KEY_TEXT_WORD_RIGHT, glfwGetKey(win, GLFW_KEY_RIGHT) == GLFW_PRESS);
341 nk_input_key(ctx, NK_KEY_TEXT_LINE_START, glfwGetKey(win, GLFW_KEY_B) == GLFW_PRESS);
342 nk_input_key(ctx, NK_KEY_TEXT_LINE_END, glfwGetKey(win, GLFW_KEY_E) == GLFW_PRESS);
343 } else {
344 nk_input_key(ctx, NK_KEY_LEFT, glfwGetKey(win, GLFW_KEY_LEFT) == GLFW_PRESS);
345 nk_input_key(ctx, NK_KEY_RIGHT, glfwGetKey(win, GLFW_KEY_RIGHT) == GLFW_PRESS);
346 nk_input_key(ctx, NK_KEY_COPY, 0);
347 nk_input_key(ctx, NK_KEY_PASTE, 0);
348 nk_input_key(ctx, NK_KEY_CUT, 0);
349 nk_input_key(ctx, NK_KEY_SHIFT, 0);
350 }
351
352 glfwGetCursorPos(win, &x, &y);
353 nk_input_motion(ctx, (int)x, (int)y);
354 if (ctx->input.mouse.grabbed) {
355 glfwSetCursorPos(glfw.win, (double)ctx->input.mouse.prev.x, (double)ctx->input.mouse.prev.y);
356 ctx->input.mouse.pos.x = ctx->input.mouse.prev.x;
357 ctx->input.mouse.pos.y = ctx->input.mouse.prev.y;
358 }
359
360 nk_input_button(ctx, NK_BUTTON_LEFT, (int)x, (int)y, glfwGetMouseButton(win, GLFW_MOUSE_BUTTON_LEFT) == GLFW_PRESS);
361 nk_input_button(ctx, NK_BUTTON_MIDDLE, (int)x, (int)y, glfwGetMouseButton(win, GLFW_MOUSE_BUTTON_MIDDLE) == GLFW_PRESS);
362 nk_input_button(ctx, NK_BUTTON_RIGHT, (int)x, (int)y, glfwGetMouseButton(win, GLFW_MOUSE_BUTTON_RIGHT) == GLFW_PRESS);
363 nk_input_button(ctx, NK_BUTTON_DOUBLE, (int)glfw.double_click_pos.x, (int)glfw.double_click_pos.y, glfw.is_double_click_down);
364 nk_input_scroll(ctx, glfw.scroll);
365 nk_input_end(&glfw.ctx);
366 glfw.text_len = 0;
367 glfw.scroll = nk_vec2(0,0);
368}
369
370NK_API
371void nk_glfw3_shutdown(void)
372{
373 struct nk_glfw_device *dev = &glfw.ogl;
374 nk_font_atlas_clear(&glfw.atlas);
375 nk_free(&glfw.ctx);
376 glDeleteTextures(1, &dev->font_tex);
377 nk_buffer_free(&dev->cmds);
378 NK_MEMSET(&glfw, 0, sizeof(glfw));
379}
380
381#endif