jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 1 | |
| 2 | /* Copyright (c) Mark J. Kilgard, 1997. */ |
| 3 | |
| 4 | /* This program is freely distributable without licensing fees |
| 5 | and is provided without guarantee or warrantee expressed or |
| 6 | implied. This program is -not- in the public domain. */ |
| 7 | |
| 8 | /* This example demonstrates how to render particle effects |
| 9 | with OpenGL. A cloud of pinkish/orange particles explodes with the |
| 10 | particles bouncing off the ground. When the EXT_point_parameters |
| 11 | is present , the particle size is attenuated based on eye distance. */ |
| 12 | |
| 13 | |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 14 | #include <stdio.h> |
| 15 | #include <stdlib.h> |
| 16 | #include <string.h> |
| 17 | #include <math.h> /* for cos(), sin(), and sqrt() */ |
Karl Schultz | 164ce12 | 2002-01-16 00:48:43 +0000 | [diff] [blame] | 18 | #ifdef _WIN32 |
| 19 | #include <windows.h> |
| 20 | #endif |
José Fonseca | 2e61d13 | 2009-01-24 16:39:49 +0000 | [diff] [blame] | 21 | #include <GL/glew.h> |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 22 | #include <GL/glut.h> |
| 23 | |
| 24 | /* Some <math.h> files do not define M_PI... */ |
| 25 | #ifndef M_PI |
| 26 | #define M_PI 3.14159265 |
| 27 | #endif |
| 28 | |
| 29 | #if 0 /* For debugging. */ |
| 30 | #undef GL_EXT_point_parameters |
| 31 | #endif |
| 32 | |
| 33 | static GLfloat angle = -150; /* in degrees */ |
| 34 | static int spin = 0; |
| 35 | static int moving, begin; |
| 36 | static int newModel = 1; |
| 37 | static float theTime; |
| 38 | static int repeat = 1; |
| 39 | static int blend = 1; |
| 40 | int useMipmaps = 1; |
| 41 | int linearFiltering = 1; |
| 42 | |
| 43 | static GLfloat constant[3] = { 1/5.0, 0.0, 0.0 }; |
| 44 | static GLfloat linear[3] = { 0.0, 1/5.0, 0.0 }; |
| 45 | static GLfloat theQuad[3] = { 0.25, 0.0, 1/60.0 }; |
| 46 | |
| 47 | #define MAX_POINTS 2000 |
| 48 | |
| 49 | static int numPoints = 200; |
| 50 | |
| 51 | static GLfloat pointList[MAX_POINTS][3]; |
| 52 | static GLfloat pointTime[MAX_POINTS]; |
| 53 | static GLfloat pointVelocity[MAX_POINTS][2]; |
| 54 | static GLfloat pointDirection[MAX_POINTS][2]; |
| 55 | static int colorList[MAX_POINTS]; |
| 56 | static int animate = 1, motion = 0; |
| 57 | |
| 58 | static GLfloat colorSet[][4] = { |
| 59 | /* Shades of red. */ |
| 60 | { 0.7, 0.2, 0.4, 0.5 }, |
| 61 | { 0.8, 0.0, 0.7, 0.5 }, |
| 62 | { 1.0, 0.0, 0.0, 0.5 }, |
| 63 | { 0.9, 0.3, 0.6, 0.5 }, |
| 64 | { 1.0, 0.4, 0.0, 0.5 }, |
| 65 | { 1.0, 0.0, 0.5, 0.5 }, |
| 66 | }; |
| 67 | |
| 68 | #define NUM_COLORS (sizeof(colorSet)/sizeof(colorSet[0])) |
| 69 | |
| 70 | #define DEAD (NUM_COLORS+1) |
| 71 | |
| 72 | |
| 73 | #if 0 /* drand48 might be better on Unix machines */ |
| 74 | #define RANDOM_RANGE(lo, hi) ((lo) + (hi - lo) * drand48()) |
| 75 | #else |
| 76 | static float float_rand(void) { return rand() / (float) RAND_MAX; } |
| 77 | #define RANDOM_RANGE(lo, hi) ((lo) + (hi - lo) * float_rand()) |
| 78 | #endif |
| 79 | |
| 80 | #define MEAN_VELOCITY 3.0 |
| 81 | #define GRAVITY 2.0 |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 82 | |
| 83 | /* Modeling units of ground extent in each X and Z direction. */ |
| 84 | #define EDGE 12 |
| 85 | |
Brian Paul | 02e8a03 | 2000-06-27 17:04:43 +0000 | [diff] [blame] | 86 | static void |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 87 | makePointList(void) |
| 88 | { |
| 89 | float angle, velocity, direction; |
| 90 | int i; |
| 91 | |
| 92 | motion = 1; |
| 93 | for (i=0; i<numPoints; i++) { |
| 94 | pointList[i][0] = 0.0; |
| 95 | pointList[i][1] = 0.0; |
| 96 | pointList[i][2] = 0.0; |
| 97 | pointTime[i] = 0.0; |
| 98 | angle = (RANDOM_RANGE(60.0, 70.0)) * M_PI/180.0; |
| 99 | direction = RANDOM_RANGE(0.0, 360.0) * M_PI/180.0; |
| 100 | pointDirection[i][0] = cos(direction); |
| 101 | pointDirection[i][1] = sin(direction); |
| 102 | velocity = MEAN_VELOCITY + RANDOM_RANGE(-0.8, 1.0); |
| 103 | pointVelocity[i][0] = velocity * cos(angle); |
| 104 | pointVelocity[i][1] = velocity * sin(angle); |
| 105 | colorList[i] = rand() % NUM_COLORS; |
| 106 | } |
| 107 | theTime = 0.0; |
| 108 | } |
| 109 | |
Brian Paul | 02e8a03 | 2000-06-27 17:04:43 +0000 | [diff] [blame] | 110 | static void |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 111 | updatePointList(void) |
| 112 | { |
| 113 | float distance; |
| 114 | int i; |
| 115 | |
Brian Paul | 92eddb0 | 2005-01-09 17:37:50 +0000 | [diff] [blame] | 116 | static double t0 = -1.; |
| 117 | double dt, t = glutGet(GLUT_ELAPSED_TIME) / 1000.0; |
| 118 | if (t0 < 0.0) |
| 119 | t0 = t; |
| 120 | dt = t - t0; |
| 121 | t0 = t; |
| 122 | |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 123 | motion = 0; |
| 124 | for (i=0; i<numPoints; i++) { |
| 125 | distance = pointVelocity[i][0] * theTime; |
| 126 | |
| 127 | /* X and Z */ |
| 128 | pointList[i][0] = pointDirection[i][0] * distance; |
| 129 | pointList[i][2] = pointDirection[i][1] * distance; |
| 130 | |
| 131 | /* Z */ |
| 132 | pointList[i][1] = |
| 133 | (pointVelocity[i][1] - 0.5 * GRAVITY * pointTime[i])*pointTime[i]; |
| 134 | |
| 135 | /* If we hit the ground, bounce the point upward again. */ |
| 136 | if (pointList[i][1] <= 0.0) { |
| 137 | if (distance > EDGE) { |
| 138 | /* Particle has hit ground past the distance duration of |
| 139 | the particles. Mark particle as dead. */ |
| 140 | colorList[i] = NUM_COLORS; /* Not moving. */ |
| 141 | continue; |
| 142 | } |
| 143 | |
| 144 | pointVelocity[i][1] *= 0.8; /* 80% of previous up velocity. */ |
| 145 | pointTime[i] = 0.0; /* Reset the particles sense of up time. */ |
| 146 | } |
| 147 | motion = 1; |
Brian Paul | 92eddb0 | 2005-01-09 17:37:50 +0000 | [diff] [blame] | 148 | pointTime[i] += dt; |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 149 | } |
Brian Paul | 92eddb0 | 2005-01-09 17:37:50 +0000 | [diff] [blame] | 150 | theTime += dt; |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 151 | if (!motion && !spin) { |
| 152 | if (repeat) { |
| 153 | makePointList(); |
| 154 | } else { |
| 155 | glutIdleFunc(NULL); |
| 156 | } |
| 157 | } |
| 158 | } |
| 159 | |
Brian Paul | 02e8a03 | 2000-06-27 17:04:43 +0000 | [diff] [blame] | 160 | static void |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 161 | idle(void) |
| 162 | { |
| 163 | updatePointList(); |
| 164 | if (spin) { |
| 165 | angle += 0.3; |
| 166 | newModel = 1; |
| 167 | } |
| 168 | glutPostRedisplay(); |
| 169 | } |
| 170 | |
Brian Paul | 02e8a03 | 2000-06-27 17:04:43 +0000 | [diff] [blame] | 171 | static void |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 172 | visible(int vis) |
| 173 | { |
| 174 | if (vis == GLUT_VISIBLE) { |
| 175 | if (animate && (motion || spin)) { |
| 176 | glutIdleFunc(idle); |
| 177 | } |
| 178 | } else { |
| 179 | glutIdleFunc(NULL); |
| 180 | } |
| 181 | } |
| 182 | |
Brian Paul | 02e8a03 | 2000-06-27 17:04:43 +0000 | [diff] [blame] | 183 | static void |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 184 | recalcModelView(void) |
| 185 | { |
| 186 | glPopMatrix(); |
| 187 | glPushMatrix(); |
| 188 | glRotatef(angle, 0.0, 1.0, 0.0); |
| 189 | newModel = 0; |
| 190 | } |
| 191 | |
Brian Paul | 02e8a03 | 2000-06-27 17:04:43 +0000 | [diff] [blame] | 192 | static void |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 193 | redraw(void) |
| 194 | { |
| 195 | int i; |
| 196 | |
Ian Romanick | f359165 | 2009-06-30 17:29:14 -0700 | [diff] [blame] | 197 | glDepthMask(GL_TRUE); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 198 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
| 199 | if (newModel) |
| 200 | recalcModelView(); |
| 201 | |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 202 | |
| 203 | /* Draw the floor. */ |
| 204 | /* glEnable(GL_TEXTURE_2D);*/ |
| 205 | glColor3f(0.5, 1.0, 0.5); |
| 206 | glBegin(GL_QUADS); |
| 207 | glTexCoord2f(0.0, 0.0); |
| 208 | glVertex3f(-EDGE, -0.05, -EDGE); |
| 209 | glTexCoord2f(20.0, 0.0); |
| 210 | glVertex3f(EDGE, -0.05, -EDGE); |
| 211 | glTexCoord2f(20.0, 20.0); |
| 212 | glVertex3f(EDGE, -0.05, EDGE); |
| 213 | glTexCoord2f(0.0, 20.0); |
| 214 | glVertex3f(-EDGE, -0.05, EDGE); |
| 215 | glEnd(); |
| 216 | |
| 217 | /* Allow particles to blend with each other. */ |
Ian Romanick | f359165 | 2009-06-30 17:29:14 -0700 | [diff] [blame] | 218 | glDepthMask(GL_FALSE); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 219 | |
| 220 | if (blend) |
| 221 | glEnable(GL_BLEND); |
| 222 | |
| 223 | glDisable(GL_TEXTURE_2D); |
| 224 | glBegin(GL_POINTS); |
| 225 | for (i=0; i<numPoints; i++) { |
| 226 | /* Draw alive particles. */ |
| 227 | if (colorList[i] != DEAD) { |
| 228 | glColor4fv(colorSet[colorList[i]]); |
| 229 | glVertex3fv(pointList[i]); |
| 230 | } |
| 231 | } |
| 232 | glEnd(); |
| 233 | |
| 234 | glDisable(GL_BLEND); |
| 235 | |
| 236 | glutSwapBuffers(); |
| 237 | } |
| 238 | |
| 239 | /* ARGSUSED2 */ |
Brian Paul | 02e8a03 | 2000-06-27 17:04:43 +0000 | [diff] [blame] | 240 | static void |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 241 | mouse(int button, int state, int x, int y) |
| 242 | { |
| 243 | /* Scene can be spun around Y axis using left |
| 244 | mouse button movement. */ |
| 245 | if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN) { |
| 246 | moving = 1; |
| 247 | begin = x; |
| 248 | } |
| 249 | if (button == GLUT_LEFT_BUTTON && state == GLUT_UP) { |
| 250 | moving = 0; |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | /* ARGSUSED1 */ |
Brian Paul | 02e8a03 | 2000-06-27 17:04:43 +0000 | [diff] [blame] | 255 | static void |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 256 | mouseMotion(int x, int y) |
| 257 | { |
| 258 | if (moving) { |
| 259 | angle = angle + (x - begin); |
| 260 | begin = x; |
| 261 | newModel = 1; |
| 262 | glutPostRedisplay(); |
| 263 | } |
| 264 | } |
| 265 | |
Brian Paul | 02e8a03 | 2000-06-27 17:04:43 +0000 | [diff] [blame] | 266 | static void |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 267 | menu(int option) |
| 268 | { |
| 269 | switch (option) { |
| 270 | case 0: |
| 271 | makePointList(); |
| 272 | break; |
Brian Paul | 92eddb0 | 2005-01-09 17:37:50 +0000 | [diff] [blame] | 273 | #ifdef GL_ARB_point_parameters |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 274 | case 1: |
Brian Paul | 66fa33e | 2002-12-03 03:13:17 +0000 | [diff] [blame] | 275 | glPointParameterfvARB(GL_POINT_DISTANCE_ATTENUATION_ARB, constant); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 276 | break; |
| 277 | case 2: |
Brian Paul | 66fa33e | 2002-12-03 03:13:17 +0000 | [diff] [blame] | 278 | glPointParameterfvARB(GL_POINT_DISTANCE_ATTENUATION_ARB, linear); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 279 | break; |
| 280 | case 3: |
Brian Paul | 66fa33e | 2002-12-03 03:13:17 +0000 | [diff] [blame] | 281 | glPointParameterfvARB(GL_POINT_DISTANCE_ATTENUATION_ARB, theQuad); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 282 | break; |
| 283 | #endif |
| 284 | case 4: |
| 285 | blend = 1; |
| 286 | break; |
| 287 | case 5: |
| 288 | blend = 0; |
| 289 | break; |
Brian Paul | 92eddb0 | 2005-01-09 17:37:50 +0000 | [diff] [blame] | 290 | #ifdef GL_ARB_point_parameters |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 291 | case 6: |
Brian Paul | 66fa33e | 2002-12-03 03:13:17 +0000 | [diff] [blame] | 292 | glPointParameterfARB(GL_POINT_FADE_THRESHOLD_SIZE_ARB, 1.0); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 293 | break; |
| 294 | case 7: |
Brian Paul | 66fa33e | 2002-12-03 03:13:17 +0000 | [diff] [blame] | 295 | glPointParameterfARB(GL_POINT_FADE_THRESHOLD_SIZE_ARB, 10.0); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 296 | break; |
| 297 | #endif |
| 298 | case 8: |
| 299 | glEnable(GL_POINT_SMOOTH); |
| 300 | break; |
| 301 | case 9: |
| 302 | glDisable(GL_POINT_SMOOTH); |
| 303 | break; |
| 304 | case 10: |
| 305 | glPointSize(2.0); |
| 306 | break; |
| 307 | case 11: |
| 308 | glPointSize(4.0); |
| 309 | break; |
| 310 | case 12: |
| 311 | glPointSize(8.0); |
| 312 | break; |
| 313 | case 13: |
| 314 | spin = 1 - spin; |
| 315 | if (animate && (spin || motion)) { |
| 316 | glutIdleFunc(idle); |
| 317 | } else { |
| 318 | glutIdleFunc(NULL); |
| 319 | } |
| 320 | break; |
| 321 | case 14: |
| 322 | numPoints = 200; |
| 323 | break; |
| 324 | case 15: |
| 325 | numPoints = 500; |
| 326 | break; |
| 327 | case 16: |
| 328 | numPoints = 1000; |
| 329 | break; |
| 330 | case 17: |
| 331 | numPoints = 2000; |
| 332 | break; |
| 333 | case 666: |
| 334 | exit(0); |
| 335 | } |
| 336 | glutPostRedisplay(); |
| 337 | } |
| 338 | |
| 339 | /* ARGSUSED1 */ |
Brian Paul | 02e8a03 | 2000-06-27 17:04:43 +0000 | [diff] [blame] | 340 | static void |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 341 | key(unsigned char c, int x, int y) |
| 342 | { |
| 343 | switch (c) { |
| 344 | case 13: |
| 345 | animate = 1 - animate; /* toggle. */ |
| 346 | if (animate && (motion || spin)) { |
| 347 | glutIdleFunc(idle); |
| 348 | } else { |
| 349 | glutIdleFunc(NULL); |
| 350 | } |
| 351 | break; |
| 352 | case ' ': |
| 353 | animate = 1; |
| 354 | makePointList(); |
| 355 | glutIdleFunc(idle); |
| 356 | break; |
| 357 | case 27: |
| 358 | exit(0); |
| 359 | } |
| 360 | } |
| 361 | |
| 362 | /* Nice floor texture tiling pattern. */ |
| 363 | static char *circles[] = { |
| 364 | "....xxxx........", |
| 365 | "..xxxxxxxx......", |
| 366 | ".xxxxxxxxxx.....", |
| 367 | ".xxx....xxx.....", |
| 368 | "xxx......xxx....", |
| 369 | "xxx......xxx....", |
| 370 | "xxx......xxx....", |
| 371 | "xxx......xxx....", |
| 372 | ".xxx....xxx.....", |
| 373 | ".xxxxxxxxxx.....", |
| 374 | "..xxxxxxxx......", |
| 375 | "....xxxx........", |
| 376 | "................", |
| 377 | "................", |
| 378 | "................", |
| 379 | "................", |
| 380 | }; |
| 381 | |
| 382 | static void |
| 383 | makeFloorTexture(void) |
| 384 | { |
| 385 | GLubyte floorTexture[16][16][3]; |
| 386 | GLubyte *loc; |
| 387 | int s, t; |
| 388 | |
| 389 | /* Setup RGB image for the texture. */ |
| 390 | loc = (GLubyte*) floorTexture; |
| 391 | for (t = 0; t < 16; t++) { |
| 392 | for (s = 0; s < 16; s++) { |
| 393 | if (circles[t][s] == 'x') { |
| 394 | /* Nice blue. */ |
| 395 | loc[0] = 0x1f; |
| 396 | loc[1] = 0x1f; |
| 397 | loc[2] = 0x8f; |
| 398 | } else { |
| 399 | /* Light gray. */ |
| 400 | loc[0] = 0xca; |
| 401 | loc[1] = 0xca; |
| 402 | loc[2] = 0xca; |
| 403 | } |
| 404 | loc += 3; |
| 405 | } |
| 406 | } |
| 407 | |
| 408 | glPixelStorei(GL_UNPACK_ALIGNMENT, 1); |
| 409 | |
| 410 | if (useMipmaps) { |
| 411 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, |
| 412 | GL_LINEAR_MIPMAP_LINEAR); |
| 413 | gluBuild2DMipmaps(GL_TEXTURE_2D, 3, 16, 16, |
| 414 | GL_RGB, GL_UNSIGNED_BYTE, floorTexture); |
| 415 | } else { |
| 416 | if (linearFiltering) { |
| 417 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
| 418 | } else { |
| 419 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
| 420 | } |
| 421 | glTexImage2D(GL_TEXTURE_2D, 0, 3, 16, 16, 0, |
| 422 | GL_RGB, GL_UNSIGNED_BYTE, floorTexture); |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | int |
| 427 | main(int argc, char **argv) |
| 428 | { |
| 429 | int i; |
Brian Paul | 263f432 | 2009-12-18 08:12:55 -0700 | [diff] [blame] | 430 | |
| 431 | glutInitWindowSize(300, 300); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 432 | glutInit(&argc, argv); |
| 433 | glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH | GLUT_MULTISAMPLE); |
| 434 | |
| 435 | for (i=1; i<argc; i++) { |
| 436 | if(!strcmp("-noms", argv[i])) { |
| 437 | glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); |
| 438 | printf("forcing no multisampling\n"); |
| 439 | } else if(!strcmp("-nomipmaps", argv[i])) { |
| 440 | useMipmaps = 0; |
| 441 | } else if(!strcmp("-nearest", argv[i])) { |
| 442 | linearFiltering = 0; |
| 443 | } |
| 444 | } |
| 445 | |
| 446 | glutCreateWindow("point burst"); |
José Fonseca | 2e61d13 | 2009-01-24 16:39:49 +0000 | [diff] [blame] | 447 | glewInit(); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 448 | glutDisplayFunc(redraw); |
| 449 | glutMouseFunc(mouse); |
| 450 | glutMotionFunc(mouseMotion); |
| 451 | glutVisibilityFunc(visible); |
| 452 | glutKeyboardFunc(key); |
| 453 | glutCreateMenu(menu); |
| 454 | glutAddMenuEntry("Reset time", 0); |
| 455 | glutAddMenuEntry("Constant", 1); |
| 456 | glutAddMenuEntry("Linear", 2); |
| 457 | glutAddMenuEntry("Quadratic", 3); |
| 458 | glutAddMenuEntry("Blend on", 4); |
| 459 | glutAddMenuEntry("Blend off", 5); |
| 460 | glutAddMenuEntry("Threshold 1", 6); |
| 461 | glutAddMenuEntry("Threshold 10", 7); |
| 462 | glutAddMenuEntry("Point smooth on", 8); |
| 463 | glutAddMenuEntry("Point smooth off", 9); |
| 464 | glutAddMenuEntry("Point size 2", 10); |
| 465 | glutAddMenuEntry("Point size 4", 11); |
| 466 | glutAddMenuEntry("Point size 8", 12); |
| 467 | glutAddMenuEntry("Toggle spin", 13); |
| 468 | glutAddMenuEntry("200 points ", 14); |
| 469 | glutAddMenuEntry("500 points ", 15); |
| 470 | glutAddMenuEntry("1000 points ", 16); |
| 471 | glutAddMenuEntry("2000 points ", 17); |
| 472 | glutAddMenuEntry("Quit", 666); |
| 473 | glutAttachMenu(GLUT_RIGHT_BUTTON); |
| 474 | |
Brian Paul | a394f54 | 2006-08-28 14:20:19 +0000 | [diff] [blame] | 475 | if (!glutExtensionSupported("GL_ARB_point_parameters")) { |
| 476 | fprintf(stderr, "Sorry, GL_ARB_point_parameters is not supported.\n"); |
| 477 | return -1; |
| 478 | } |
| 479 | |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 480 | glShadeModel(GL_FLAT); |
| 481 | glEnable(GL_DEPTH_TEST); |
| 482 | glEnable(GL_POINT_SMOOTH); |
| 483 | glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); |
| 484 | glPointSize(8.0); |
Brian Paul | 66fa33e | 2002-12-03 03:13:17 +0000 | [diff] [blame] | 485 | #if GL_ARB_point_parameters |
| 486 | glPointParameterfvARB(GL_POINT_DISTANCE_ATTENUATION_ARB, theQuad); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 487 | #endif |
| 488 | glMatrixMode(GL_PROJECTION); |
| 489 | gluPerspective( /* field of view in degree */ 40.0, |
| 490 | /* aspect ratio */ 1.0, |
| 491 | /* Z near */ 0.5, /* Z far */ 40.0); |
| 492 | glMatrixMode(GL_MODELVIEW); |
| 493 | gluLookAt(0.0, 1.0, 8.0, /* eye location */ |
| 494 | 0.0, 1.0, 0.0, /* center is at (0,0,0) */ |
| 495 | 0.0, 1.0, 0.); /* up is in postivie Y direction */ |
| 496 | glPushMatrix(); /* dummy push so we can pop on model |
| 497 | recalc */ |
| 498 | |
| 499 | makePointList(); |
| 500 | makeFloorTexture(); |
| 501 | |
| 502 | glutMainLoop(); |
| 503 | return 0; /* ANSI C requires main to return int. */ |
| 504 | } |