aboutsummaryrefslogtreecommitdiff
path: root/nx-X11/extras/Mesa_6.4.2/progs/demos/pointblast.c
blob: 715813f1763ed539ff95fd6372b4c5ec32d48e9c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498

/* Copyright (c) Mark J. Kilgard, 1997.  */

/* This program is freely distributable without licensing fees 
   and is provided without guarantee or warrantee expressed or 
   implied. This program is -not- in the public domain. */

/* This example demonstrates how to render particle effects
   with OpenGL.  A cloud of pinkish/orange particles explodes with the
   particles bouncing off the ground.  When the EXT_point_parameters
   is present , the particle size is attenuated based on eye distance. */


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>       /* for cos(), sin(), and sqrt() */
#ifdef _WIN32
#include <windows.h>
#endif
#define GL_GLEXT_PROTOTYPES
#include <GL/glut.h>

/* Some <math.h> files do not define M_PI... */
#ifndef M_PI
#define M_PI 3.14159265
#endif

#if 0  /* For debugging. */
#undef GL_EXT_point_parameters
#endif

static GLfloat angle = -150;   /* in degrees */
static int spin = 0;
static int moving, begin;
static int newModel = 1;
static float theTime;
static int repeat = 1;
static int blend = 1;
int useMipmaps = 1;
int linearFiltering = 1;

static GLfloat constant[3] = { 1/5.0, 0.0, 0.0 };
static GLfloat linear[3] = { 0.0, 1/5.0, 0.0 };
static GLfloat theQuad[3] = { 0.25, 0.0, 1/60.0 };

#define MAX_POINTS 2000

static int numPoints = 200;

static GLfloat pointList[MAX_POINTS][3];
static GLfloat pointTime[MAX_POINTS];
static GLfloat pointVelocity[MAX_POINTS][2];
static GLfloat pointDirection[MAX_POINTS][2];
static int colorList[MAX_POINTS];
static int animate = 1, motion = 0;

static GLfloat colorSet[][4] = {
  /* Shades of red. */
  { 0.7, 0.2, 0.4, 0.5 },
  { 0.8, 0.0, 0.7, 0.5 },
  { 1.0, 0.0, 0.0, 0.5 },
  { 0.9, 0.3, 0.6, 0.5 },
  { 1.0, 0.4, 0.0, 0.5 },
  { 1.0, 0.0, 0.5, 0.5 },
};

#define NUM_COLORS (sizeof(colorSet)/sizeof(colorSet[0]))

#define DEAD (NUM_COLORS+1)


#if 0  /* drand48 might be better on Unix machines */
#define RANDOM_RANGE(lo, hi) ((lo) + (hi - lo) * drand48())
#else
static float float_rand(void) { return rand() / (float) RAND_MAX; }
#define RANDOM_RANGE(lo, hi) ((lo) + (hi - lo) * float_rand())
#endif

#define MEAN_VELOCITY 3.0
#define GRAVITY 2.0

/* Modeling units of ground extent in each X and Z direction. */
#define EDGE 12

static void
makePointList(void)
{
  float angle, velocity, direction;
  int i;

  motion = 1;
  for (i=0; i<numPoints; i++) {
    pointList[i][0] = 0.0;
    pointList[i][1] = 0.0;
    pointList[i][2] = 0.0;
    pointTime[i] = 0.0;
    angle = (RANDOM_RANGE(60.0, 70.0)) * M_PI/180.0;
    direction = RANDOM_RANGE(0.0, 360.0) * M_PI/180.0;
    pointDirection[i][0] = cos(direction);
    pointDirection[i][1] = sin(direction);
    velocity = MEAN_VELOCITY + RANDOM_RANGE(-0.8, 1.0);
    pointVelocity[i][0] = velocity * cos(angle);
    pointVelocity[i][1] = velocity * sin(angle);
    colorList[i] = rand() % NUM_COLORS;
  }
  theTime = 0.0;
}

static void
updatePointList(void)
{
  float distance;
  int i;

  static double t0 = -1.;
  double dt, t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
  if (t0 < 0.0)
    t0 = t;
  dt = t - t0;
  t0 = t;

  motion = 0;
  for (i=0; i<numPoints; i++) {
    distance = pointVelocity[i][0] * theTime;

    /* X and Z */
    pointList[i][0] = pointDirection[i][0] * distance;
    pointList[i][2] = pointDirection[i][1] * distance;

    /* Z */
    pointList[i][1] =
      (pointVelocity[i][1] - 0.5 * GRAVITY * pointTime[i])*pointTime[i];

    /* If we hit the ground, bounce the point upward again. */
    if (pointList[i][1] <= 0.0) {
      if (distance > EDGE) {
        /* Particle has hit ground past the distance duration of
          the particles.  Mark particle as dead. */
       colorList[i] = NUM_COLORS;  /* Not moving. */
       continue;
      }

      pointVelocity[i][1] *= 0.8;  /* 80% of previous up velocity. */
      pointTime[i] = 0.0;  /* Reset the particles sense of up time. */
    }
    motion = 1;
    pointTime[i] += dt;
  }
  theTime += dt;
  if (!motion && !spin) {
    if (repeat) {
      makePointList();
    } else {
      glutIdleFunc(NULL);
    }
  }
}

static void
idle(void)
{
  updatePointList();
  if (spin) {
    angle += 0.3;
    newModel = 1;
  }
  glutPostRedisplay();
}

static void
visible(int vis)
{
  if (vis == GLUT_VISIBLE) {
    if (animate && (motion || spin)) {
      glutIdleFunc(idle);
    }
  } else {
    glutIdleFunc(NULL);
  }
}

static void
recalcModelView(void)
{
  glPopMatrix();
  glPushMatrix();
  glRotatef(angle, 0.0, 1.0, 0.0);
  newModel = 0;
}

static void
redraw(void)
{
  int i;

  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  if (newModel)
    recalcModelView();

  glDepthMask(GL_FALSE);

  /* Draw the floor. */
/*  glEnable(GL_TEXTURE_2D);*/
  glColor3f(0.5, 1.0, 0.5);
  glBegin(GL_QUADS);
    glTexCoord2f(0.0, 0.0);
    glVertex3f(-EDGE, -0.05, -EDGE);
    glTexCoord2f(20.0, 0.0);
    glVertex3f(EDGE, -0.05, -EDGE);
    glTexCoord2f(20.0, 20.0);
    glVertex3f(EDGE, -0.05, EDGE);
    glTexCoord2f(0.0, 20.0);
    glVertex3f(-EDGE, -0.05, EDGE);
  glEnd();

  /* Allow particles to blend with each other. */
  glDepthMask(GL_TRUE);

  if (blend)
     glEnable(GL_BLEND);

  glDisable(GL_TEXTURE_2D);
  glBegin(GL_POINTS);
    for (i=0; i<numPoints; i++) {
      /* Draw alive particles. */
      if (colorList[i] != DEAD) {
        glColor4fv(colorSet[colorList[i]]);
        glVertex3fv(pointList[i]);
      }
    }
  glEnd();

  glDisable(GL_BLEND);

  glutSwapBuffers();
}

/* ARGSUSED2 */
static void
mouse(int button, int state, int x, int y)
{
  /* Scene can be spun around Y axis using left
     mouse button movement. */
  if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN) {
    moving = 1;
    begin = x;
  }
  if (button == GLUT_LEFT_BUTTON && state == GLUT_UP) {
    moving = 0;
  }
}

/* ARGSUSED1 */
static void
mouseMotion(int x, int y)
{
  if (moving) {
    angle = angle + (x - begin);
    begin = x;
    newModel = 1;
    glutPostRedisplay();
  }
}

static void
menu(int option)
{
  switch (option) {
  case 0:
    makePointList();
    break;
#ifdef GL_ARB_point_parameters
  case 1:
    glPointParameterfvARB(GL_POINT_DISTANCE_ATTENUATION_ARB, constant);
    break;
  case 2:
    glPointParameterfvARB(GL_POINT_DISTANCE_ATTENUATION_ARB, linear);
    break;
  case 3:
    glPointParameterfvARB(GL_POINT_DISTANCE_ATTENUATION_ARB, theQuad);
    break;
#endif
  case 4:
    blend = 1;
    break;
  case 5:
    blend = 0;
    break;
#ifdef GL_ARB_point_parameters
  case 6:
    glPointParameterfARB(GL_POINT_FADE_THRESHOLD_SIZE_ARB, 1.0);
    break;
  case 7:
    glPointParameterfARB(GL_POINT_FADE_THRESHOLD_SIZE_ARB, 10.0);
    break;
#endif
  case 8:
    glEnable(GL_POINT_SMOOTH);
    break;
  case 9:
    glDisable(GL_POINT_SMOOTH);
    break;
  case 10:
    glPointSize(2.0);
    break;
  case 11:
    glPointSize(4.0);
    break;
  case 12:
    glPointSize(8.0);
    break;
  case 13:
    spin = 1 - spin;
    if (animate && (spin || motion)) {
      glutIdleFunc(idle);
    } else {
      glutIdleFunc(NULL);
    }
    break;
  case 14:
    numPoints = 200;
    break;
  case 15:
    numPoints = 500;
    break;
  case 16:
    numPoints = 1000;
    break;
  case 17:
    numPoints = 2000;
    break;
  case 666:
    exit(0);
  }
  glutPostRedisplay();
}

/* ARGSUSED1 */
static void
key(unsigned char c, int x, int y)
{
  switch (c) {
  case 13:
    animate = 1 - animate;  /* toggle. */
    if (animate && (motion || spin)) {
      glutIdleFunc(idle);
    } else {
      glutIdleFunc(NULL);
    }
    break;
  case ' ':
    animate = 1;
    makePointList();
    glutIdleFunc(idle);
    break;
  case 27:
    exit(0);
  }
}

/* Nice floor texture tiling pattern. */
static char *circles[] = {
  "....xxxx........",
  "..xxxxxxxx......",
  ".xxxxxxxxxx.....",
  ".xxx....xxx.....",
  "xxx......xxx....",
  "xxx......xxx....",
  "xxx......xxx....",
  "xxx......xxx....",
  ".xxx....xxx.....",
  ".xxxxxxxxxx.....",
  "..xxxxxxxx......",
  "....xxxx........",
  "................",
  "................",
  "................",
  "................",
};

static void
makeFloorTexture(void)
{
  GLubyte floorTexture[16][16][3];
  GLubyte *loc;
  int s, t;

  /* Setup RGB image for the texture. */
  loc = (GLubyte*) floorTexture;
  for (t = 0; t < 16; t++) {
    for (s = 0; s < 16; s++) {
      if (circles[t][s] == 'x') {
        /* Nice blue. */
        loc[0] = 0x1f;
        loc[1] = 0x1f;
        loc[2] = 0x8f;
      } else {
        /* Light gray. */
        loc[0] = 0xca;
        loc[1] = 0xca;
        loc[2] = 0xca;
      }
      loc += 3;
    }
  }

  glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

  if (useMipmaps) {
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
      GL_LINEAR_MIPMAP_LINEAR);
    gluBuild2DMipmaps(GL_TEXTURE_2D, 3, 16, 16,
      GL_RGB, GL_UNSIGNED_BYTE, floorTexture);
  } else {
    if (linearFiltering) {
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    } else {
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    }
    glTexImage2D(GL_TEXTURE_2D, 0, 3, 16, 16, 0,
      GL_RGB, GL_UNSIGNED_BYTE, floorTexture);
  }
}

int
main(int argc, char **argv)
{
  int i;
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH | GLUT_MULTISAMPLE);
  glutInitWindowPosition(0, 0);
  glutInitWindowSize(300, 300);

  for (i=1; i<argc; i++) {
    if(!strcmp("-noms", argv[i])) {
      glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
      printf("forcing no multisampling\n");
    } else if(!strcmp("-nomipmaps", argv[i])) {
      useMipmaps = 0;
    } else if(!strcmp("-nearest", argv[i])) {
      linearFiltering = 0;
    }
  }

  glutCreateWindow("point burst");
  glutDisplayFunc(redraw);
  glutMouseFunc(mouse);
  glutMotionFunc(mouseMotion);
  glutVisibilityFunc(visible);
  glutKeyboardFunc(key);
  glutCreateMenu(menu);
  glutAddMenuEntry("Reset time", 0);
  glutAddMenuEntry("Constant", 1);
  glutAddMenuEntry("Linear", 2);
  glutAddMenuEntry("Quadratic", 3);
  glutAddMenuEntry("Blend on", 4);
  glutAddMenuEntry("Blend off", 5);
  glutAddMenuEntry("Threshold 1", 6);
  glutAddMenuEntry("Threshold 10", 7);
  glutAddMenuEntry("Point smooth on", 8);
  glutAddMenuEntry("Point smooth off", 9);
  glutAddMenuEntry("Point size 2", 10);
  glutAddMenuEntry("Point size 4", 11);
  glutAddMenuEntry("Point size 8", 12);
  glutAddMenuEntry("Toggle spin", 13);
  glutAddMenuEntry("200 points ", 14);
  glutAddMenuEntry("500 points ", 15);
  glutAddMenuEntry("1000 points ", 16);
  glutAddMenuEntry("2000 points ", 17);
  glutAddMenuEntry("Quit", 666);
  glutAttachMenu(GLUT_RIGHT_BUTTON);

  glShadeModel(GL_FLAT);
  glEnable(GL_DEPTH_TEST);
  glEnable(GL_POINT_SMOOTH);
  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  glPointSize(8.0);
#if GL_ARB_point_parameters
  glPointParameterfvARB(GL_POINT_DISTANCE_ATTENUATION_ARB, theQuad);
#endif
  glMatrixMode(GL_PROJECTION);
  gluPerspective( /* field of view in degree */ 40.0,
  /* aspect ratio */ 1.0,
    /* Z near */ 0.5, /* Z far */ 40.0);
  glMatrixMode(GL_MODELVIEW);
  gluLookAt(0.0, 1.0, 8.0, /* eye location */
    0.0, 1.0, 0.0,      /* center is at (0,0,0) */
    0.0, 1.0, 0.);      /* up is in postivie Y direction */
  glPushMatrix();       /* dummy push so we can pop on model
                           recalc */

  makePointList();
  makeFloorTexture();

  glutMainLoop();
  return 0;             /* ANSI C requires main to return int. */
}