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_clipboard_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_clipboard_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_clipboard_copy; 265 glfw.ctx.clip.paste = nk_glfw3_clipboard_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 382