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comparison main.c @ 14:d055228ca9a6

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printing text with custom font
author Dennis C. M. <dennis@denniscm.com>
date Sun, 25 Jun 2023 15:51:39 +0100
parents 074bde2db09a
children e2fcfcb43fee
comparison
equal deleted inserted replaced
13:074bde2db09a 14:d055228ca9a6
43 struct BubbleSortInfo { 43 struct BubbleSortInfo {
44 int step; 44 int step;
45 int i; 45 int i;
46 }; 46 };
47 47
48 struct BubbleSortInfo bs = {0, 0}; 48 struct BubbleSortInfo bs = {1, 0};
49 49
50 void bubble_sort() { 50 void bubble_sort() {
51 if (bs.i < arr_size - bs.step - 1) { 51 if (bs.i < arr_size - bs.step - 1) {
52 int current = arr[bs.i]; 52 int current = arr[bs.i];
53 int next = arr[bs.i + 1]; 53 int next = arr[bs.i + 1];
105 105
106 106
107 /* Render functions */ 107 /* Render functions */
108 108
109 void render_text(int x, int y, char* text) { 109 void render_text(int x, int y, char* text) {
110 glRasterPos2f(x, y);
111 110
112 // Get glyph index from character code 111 // Get glyph index from character code
113 FT_UInt glyph_index = FT_Get_Char_Index(ft_face, 'o'); 112 FT_UInt glyph_index = FT_Get_Char_Index(ft_face, 'A');
113
114 if (glyph_index == 0) {
115 fprintf(stderr, "Given character code has no glyph image in the face\n");
116 exit(1);
117 }
114 118
115 // Load glyph image 119 // Load glyph image
116 if (FT_Load_Glyph(ft_face, glyph_index, FT_LOAD_DEFAULT)) { 120 if (FT_Load_Glyph(ft_face, glyph_index, FT_LOAD_DEFAULT)) {
117 fprintf(stderr, "Failed to load glyph.\n"); 121 fprintf(stderr, "Failed to load glyph.\n");
118 exit(1); 122 exit(1);
119 } 123 }
120 124
121
122 // Render glyph 125 // Render glyph
123 if (FT_Render_Glyph(ft_face->glyph, FT_RENDER_MODE_NORMAL)) { 126 if (FT_Render_Glyph(ft_face->glyph, FT_RENDER_MODE_NORMAL)) {
124 fprintf(stderr, "Failed to load glyph.\n"); 127 fprintf(stderr, "Failed to render glyph.\n");
125 exit(1); 128 exit(1);
126 } 129 }
127 130
128 FT_GlyphSlot ft_slot = ft_face->glyph; 131 FT_GlyphSlot slot = ft_face->glyph;
129 FT_Bitmap* glyph_bitmap = &ft_slot->bitmap; 132 FT_Bitmap* glyph_bitmap = &slot->bitmap;
130 133
131 glDrawPixels(glyph_bitmap->width, glyph_bitmap->rows, GL_LUMINANCE, GL_UNSIGNED_BYTE, glyph_bitmap->buffer); 134 glRasterPos2f(x, y);
135 glDrawPixels(
136 glyph_bitmap->width,
137 glyph_bitmap->rows,
138 GL_LUMINANCE,
139 GL_UNSIGNED_BYTE,
140 glyph_bitmap->buffer
141 );
132 } 142 }
133 143
134 144
135 void display() { 145 void display() {
136 glClear(GL_COLOR_BUFFER_BIT); 146 glClear(GL_COLOR_BUFFER_BIT);
147
137 glBegin(GL_QUADS); 148 glBegin(GL_QUADS);
138 149
139 int x = 0; 150 int x = 0;
140 for (int i = 0; i < arr_size; i++) { 151 for (int i = 0; i < arr_size; i++) {
141 152
229 } 240 }
230 241
231 242
232 /* Set up functions */ 243 /* Set up functions */
233 244
234 void init_gl() { 245 void setup_gl() {
235 246
236 // Set background dark 247 // Set background dark
237 glClearColor(0.0, 0.0, 0.0, 1.0); 248 glClearColor(0.0, 0.0, 0.0, 1.0);
238 249
239 // Set point color and size to 1 pixel 250 // Set point color and size to 1 pixel
248 * Creates projection matrix 259 * Creates projection matrix
249 * x increases from left to right (0 to WINDOW_WIDTH) 260 * x increases from left to right (0 to WINDOW_WIDTH)
250 * y increases from bottom to top (0 to WINDOW_HEIGHT) 261 * y increases from bottom to top (0 to WINDOW_HEIGHT)
251 */ 262 */
252 gluOrtho2D(0, WINDOW_WIDTH, 0, WINDOW_HEIGHT); 263 gluOrtho2D(0, WINDOW_WIDTH, 0, WINDOW_HEIGHT);
253 } 264
254 265 /*
255 266 * This fucking line... I spent a day rendering random symbols
256 void init_freetype() { 267 * because the padding that adds FreeType to each row of the bitmap
268 * does not match the padding expected by GL.
269 */
270
271 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
272 }
273
274
275 void setup_freetype() {
257 276
258 // Init library 277 // Init library
259 if (FT_Init_FreeType(&ft_library)) { 278 if (FT_Init_FreeType(&ft_library)) {
260 fprintf(stderr, "Failed to initialize FreeType library\n"); 279 fprintf(stderr, "Failed to initialize FreeType library\n");
261 exit(1); 280 exit(1);
262 } 281 }
263 282
264 // Load font 283 // Load font
265 if (FT_New_Face(ft_library, "JetBrainsMono-Medium.ttf", 0, &ft_face)) { 284 if (FT_New_Face(ft_library, "fonts/JetBrainsMono-Regular.ttf", 0, &ft_face)) {
266 fprintf(stderr, "Failed to load font\n"); 285 fprintf(stderr, "Failed to load font\n");
267 exit(1); 286 exit(1);
268 } 287 }
269 288
270 // Set font size 289 // Set font size
284 glutInit(&argc, argv); 303 glutInit(&argc, argv);
285 glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB); 304 glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
286 glutInitWindowSize(WINDOW_WIDTH, WINDOW_HEIGHT); 305 glutInitWindowSize(WINDOW_WIDTH, WINDOW_HEIGHT);
287 glutCreateWindow("Algorithm animator"); 306 glutCreateWindow("Algorithm animator");
288 307
289 init_gl(); 308 setup_gl();
290 init_freetype(); 309 setup_freetype();
291 310
292 glutDisplayFunc(display); 311 glutDisplayFunc(display);
293 glutKeyboardFunc(keyboard); 312 glutKeyboardFunc(keyboard);
294 glutIdleFunc(idle); 313 glutIdleFunc(idle);
295 glutMainLoop(); 314 glutMainLoop();