teapot.c revision 32001f49 
1/*
2 * This program is under the GNU GPL.
3 * Use at your own risk.
4 *
5 * written by David Bucciarelli (tech.hmw@plus.it)
6 *            Humanware s.r.l.
7 */
8
9#include <stdio.h>
10#include <stdlib.h>
11#include <math.h>
12#include <time.h>
13#include <string.h>
14
15#ifdef WIN32
16#include <windows.h>
17#endif
18
19#include "glut_wrap.h"
20#include "readtex.h"
21
22#ifdef XMESA
23#include "GL/xmesa.h"
24static int fullscreen=1;
25#endif
26
27static int WIDTH=640;
28static int HEIGHT=480;
29
30static GLint T0 = 0;
31static GLint Frames = 0;
32
33#define BASESIZE 10.0
34
35#define BASERES 12
36#define TEAPOTRES 3
37
38#ifndef M_PI
39#define M_PI 3.1415926535
40#endif
41
42extern void shadowmatrix(GLfloat [4][4], GLfloat [4], GLfloat [4]);
43extern void findplane(GLfloat [4], GLfloat [3], GLfloat [3], GLfloat [3]);
44
45
46static int win=0;
47
48static float obs[3]={5.0,0.0,1.0};
49static float dir[3];
50static float v=0.0;
51static float alpha=-90.0;
52static float beta=90.0;
53
54static GLfloat baseshadow[4][4];
55static GLfloat lightpos[4]={2.3,0.0,3.0,1.0};
56static GLfloat lightdir[3]={-2.3,0.0,-3.0};
57static GLfloat lightalpha=0.0;
58
59static int fog=1;
60static int bfcull=1;
61static int usetex=1;
62static int help=1;
63static int joyavailable=0;
64static int joyactive=0;
65
66static GLuint t1id,t2id;
67static GLuint teapotdlist,basedlist,lightdlist;
68
69
70
71/******************** begin shadow code ********************/
72
73/* Taken from the projshadow.c - by Tom McReynolds, SGI */
74
75/* Modified by David Bucciarelli */
76
77enum {
78  X, Y, Z, W
79};
80enum {
81  A, B, C, D
82};
83
84/* create a matrix that will project the desired shadow */
85void
86shadowmatrix(GLfloat shadowMat[4][4],
87  GLfloat groundplane[4],
88  GLfloat lightpos[4])
89{
90  GLfloat dot;
91
92  /* find dot product between light position vector and ground plane normal */
93  dot = groundplane[X] * lightpos[X] +
94    groundplane[Y] * lightpos[Y] +
95    groundplane[Z] * lightpos[Z] +
96    groundplane[W] * lightpos[W];
97
98  shadowMat[0][0] = dot - lightpos[X] * groundplane[X];
99  shadowMat[1][0] = 0.f - lightpos[X] * groundplane[Y];
100  shadowMat[2][0] = 0.f - lightpos[X] * groundplane[Z];
101  shadowMat[3][0] = 0.f - lightpos[X] * groundplane[W];
102
103  shadowMat[X][1] = 0.f - lightpos[Y] * groundplane[X];
104  shadowMat[1][1] = dot - lightpos[Y] * groundplane[Y];
105  shadowMat[2][1] = 0.f - lightpos[Y] * groundplane[Z];
106  shadowMat[3][1] = 0.f - lightpos[Y] * groundplane[W];
107
108  shadowMat[X][2] = 0.f - lightpos[Z] * groundplane[X];
109  shadowMat[1][2] = 0.f - lightpos[Z] * groundplane[Y];
110  shadowMat[2][2] = dot - lightpos[Z] * groundplane[Z];
111  shadowMat[3][2] = 0.f - lightpos[Z] * groundplane[W];
112
113  shadowMat[X][3] = 0.f - lightpos[W] * groundplane[X];
114  shadowMat[1][3] = 0.f - lightpos[W] * groundplane[Y];
115  shadowMat[2][3] = 0.f - lightpos[W] * groundplane[Z];
116  shadowMat[3][3] = dot - lightpos[W] * groundplane[W];
117
118}
119
120/* find the plane equation given 3 points */
121void
122findplane(GLfloat plane[4],
123  GLfloat v0[3], GLfloat v1[3], GLfloat v2[3])
124{
125  GLfloat vec0[3], vec1[3];
126
127  /* need 2 vectors to find cross product */
128  vec0[X] = v1[X] - v0[X];
129  vec0[Y] = v1[Y] - v0[Y];
130  vec0[Z] = v1[Z] - v0[Z];
131
132  vec1[X] = v2[X] - v0[X];
133  vec1[Y] = v2[Y] - v0[Y];
134  vec1[Z] = v2[Z] - v0[Z];
135
136  /* find cross product to get A, B, and C of plane equation */
137  plane[A] = vec0[Y] * vec1[Z] - vec0[Z] * vec1[Y];
138  plane[B] = -(vec0[X] * vec1[Z] - vec0[Z] * vec1[X]);
139  plane[C] = vec0[X] * vec1[Y] - vec0[Y] * vec1[X];
140
141  plane[D] = -(plane[A] * v0[X] + plane[B] * v0[Y] + plane[C] * v0[Z]);
142}
143
144/******************** end shadow code ********************/
145
146
147static void calcposobs(void)
148{
149  dir[0]=sin(alpha*M_PI/180.0);
150  dir[1]=cos(alpha*M_PI/180.0)*sin(beta*M_PI/180.0);
151  dir[2]=cos(beta*M_PI/180.0);
152
153  obs[0]+=v*dir[0];
154  obs[1]+=v*dir[1];
155  obs[2]+=v*dir[2];
156}
157
158static void special(int k, int x, int y)
159{
160  switch(k) {
161  case GLUT_KEY_LEFT:
162    alpha-=2.0;
163    break;
164  case GLUT_KEY_RIGHT:
165    alpha+=2.0;
166    break;
167  case GLUT_KEY_DOWN:
168    beta-=2.0;
169    break;
170  case GLUT_KEY_UP:
171    beta+=2.0;
172    break;
173  }
174}
175
176static void cleanup(void)
177{
178  glDeleteTextures(1, &t1id);
179  glDeleteTextures(1, &t2id);
180  glDeleteLists(teapotdlist, 1);
181  glDeleteLists(basedlist, 1);
182  glDeleteLists(lightdlist, 1);
183}
184
185static void key(unsigned char k, int x, int y)
186{
187  switch(k) {
188  case 27:
189    cleanup();
190    exit(0);
191    break;
192
193  case 'a':
194    v+=0.005;
195    break;
196  case 'z':
197    v-=0.005;
198    break;
199
200  case 'j':
201    joyactive=(!joyactive);
202    break;
203  case 'h':
204    help=(!help);
205    break;
206  case 'f':
207    fog=(!fog);
208    break;
209  case 't':
210    usetex=(!usetex);
211    break;
212  case 'b':
213    if(bfcull) {
214      glDisable(GL_CULL_FACE);
215      bfcull=0;
216    } else {
217      glEnable(GL_CULL_FACE);
218      bfcull=1;
219    }
220    break;
221#ifdef XMESA
222  case ' ':
223    XMesaSetFXmode(fullscreen ? XMESA_FX_FULLSCREEN : XMESA_FX_WINDOW);
224    fullscreen=(!fullscreen);
225    break;
226#endif
227  }
228}
229
230static void reshape(int w, int h)
231{
232  WIDTH=w;
233  HEIGHT=h;
234  glMatrixMode(GL_PROJECTION);
235  glLoadIdentity();
236  gluPerspective(45.0,w/(float)h,0.2,40.0);
237  glMatrixMode(GL_MODELVIEW);
238  glLoadIdentity();
239  glViewport(0,0,w,h);
240}
241
242static void printstring(void *font, char *string)
243{
244  int len,i;
245
246  len=(int)strlen(string);
247  for(i=0;i<len;i++)
248    glutBitmapCharacter(font,string[i]);
249}
250
251static void printhelp(void)
252{
253  glEnable(GL_BLEND);
254  glColor4f(0.5,0.5,0.5,0.5);
255  glRecti(40,40,600,440);
256  glDisable(GL_BLEND);
257
258  glColor3f(1.0,0.0,0.0);
259  glRasterPos2i(300,420);
260  printstring(GLUT_BITMAP_TIMES_ROMAN_24,"Help");
261
262  glRasterPos2i(60,390);
263  printstring(GLUT_BITMAP_TIMES_ROMAN_24,"h - Toggle Help");
264  glRasterPos2i(60,360);
265  printstring(GLUT_BITMAP_TIMES_ROMAN_24,"t - Toggle Textures");
266  glRasterPos2i(60,330);
267  printstring(GLUT_BITMAP_TIMES_ROMAN_24,"f - Toggle Fog");
268  glRasterPos2i(60,300);
269  printstring(GLUT_BITMAP_TIMES_ROMAN_24,"b - Toggle Back face culling");
270  glRasterPos2i(60,270);
271  printstring(GLUT_BITMAP_TIMES_ROMAN_24,"Arrow Keys - Rotate");
272  glRasterPos2i(60,240);
273  printstring(GLUT_BITMAP_TIMES_ROMAN_24,"a - Increase velocity");
274  glRasterPos2i(60,210);
275  printstring(GLUT_BITMAP_TIMES_ROMAN_24,"z - Decrease velocity");
276
277  glRasterPos2i(60,180);
278  if(joyavailable)
279    printstring(GLUT_BITMAP_TIMES_ROMAN_24,"j - Toggle jostick control (Joystick control available)");
280  else
281    printstring(GLUT_BITMAP_TIMES_ROMAN_24,"(No Joystick control available)");
282}
283
284static void drawbase(void)
285{
286  static const GLfloat amb[4] = { 1, .5, 0.2, 1 };
287  static const GLfloat diff[4] = { 1, .4, 0.2, 1 };
288  int i,j;
289  float x,y,dx,dy;
290
291  glBindTexture(GL_TEXTURE_2D,t1id);
292
293  glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, amb);
294  glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, diff);
295  dx=BASESIZE/BASERES;
296  dy=-BASESIZE/BASERES;
297  for(y=BASESIZE/2.0,j=0;j<BASERES;y+=dy,j++) {
298    glBegin(GL_QUAD_STRIP);
299    glColor3f(1.0,1.0,1.0);
300    glNormal3f(0.0,0.0,1.0);
301    for(x=-BASESIZE/2.0,i=0;i<BASERES;x+=dx,i++) {
302      glTexCoord2f(x,y);
303      glVertex3f(x,y,0.0);
304
305      glTexCoord2f(x,y+dy);
306      glVertex3f(x,y+dy,0.0);
307    }
308    glEnd();
309  }
310}
311
312static void drawteapot(void)
313{
314  static const GLfloat amb[4] = {  0.2, 0.2, 0.2, 1 };
315  static const GLfloat diff[4] = { 0.8, 0.3, 0.5, 1 };
316  static float xrot=0.0;
317  static float zrot=0.0;
318
319  glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, amb);
320  glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, diff);
321
322  glPushMatrix();
323  glRotatef(lightalpha,0.0,0.0,1.0);
324  glMultMatrixf((GLfloat *)baseshadow);
325  glRotatef(-lightalpha,0.0,0.0,1.0);
326
327  glTranslatef(0.0,0.0,1.0);
328  glRotatef(xrot,1.0,0.0,0.0);
329  glRotatef(zrot,0.0,0.0,1.0);
330
331  glDisable(GL_TEXTURE_2D);
332  glDisable(GL_DEPTH_TEST);
333  glDisable(GL_LIGHTING);
334
335  glColor3f(0.0,0.0,0.0);
336  glCallList(teapotdlist);
337
338  glEnable(GL_DEPTH_TEST);
339  glEnable(GL_LIGHTING);
340  if(usetex)
341    glEnable(GL_TEXTURE_2D);
342
343  glPopMatrix();
344
345  glPushMatrix();
346  glTranslatef(0.0,0.0,1.0);
347  glRotatef(xrot,1.0,0.0,0.0);
348  glRotatef(zrot,0.0,0.0,1.0);
349
350  glCallList(teapotdlist);
351  glPopMatrix();
352
353  xrot+=2.0;
354  zrot+=1.0;
355}
356
357static void drawlight1(void)
358{
359  glPushMatrix();
360  glRotatef(lightalpha,0.0,0.0,1.0);
361  glLightfv(GL_LIGHT0,GL_POSITION,lightpos);
362  glLightfv(GL_LIGHT0,GL_SPOT_DIRECTION,lightdir);
363
364  glPopMatrix();
365}
366
367static void drawlight2(void)
368{
369  glPushMatrix();
370  glRotatef(lightalpha,0.0,0.0,1.0);
371  glTranslatef(lightpos[0],lightpos[1],lightpos[2]);
372
373  glDisable(GL_TEXTURE_2D);
374  glCallList(lightdlist);
375  if(usetex)
376    glEnable(GL_TEXTURE_2D);
377
378  glPopMatrix();
379
380  lightalpha+=1.0;
381}
382
383static void dojoy(void)
384{
385#ifdef WIN32
386  static UINT max[2]={0,0};
387  static UINT min[2]={0xffffffff,0xffffffff},center[2];
388  MMRESULT res;
389  JOYINFO joy;
390
391  res=joyGetPos(JOYSTICKID1,&joy);
392
393  if(res==JOYERR_NOERROR) {
394    joyavailable=1;
395
396    if(max[0]<joy.wXpos)
397      max[0]=joy.wXpos;
398    if(min[0]>joy.wXpos)
399      min[0]=joy.wXpos;
400    center[0]=(max[0]+min[0])/2;
401
402    if(max[1]<joy.wYpos)
403      max[1]=joy.wYpos;
404    if(min[1]>joy.wYpos)
405      min[1]=joy.wYpos;
406    center[1]=(max[1]+min[1])/2;
407
408    if(joyactive) {
409      if(fabs(center[0]-(float)joy.wXpos)>0.1*(max[0]-min[0]))
410	alpha-=2.5*(center[0]-(float)joy.wXpos)/(max[0]-min[0]);
411      if(fabs(center[1]-(float)joy.wYpos)>0.1*(max[1]-min[1]))
412	beta+=2.5*(center[1]-(float)joy.wYpos)/(max[1]-min[1]);
413
414      if(joy.wButtons & JOY_BUTTON1)
415	v+=0.005;
416      if(joy.wButtons & JOY_BUTTON2)
417	v-=0.005;
418    }
419  } else
420    joyavailable=0;
421#endif
422}
423
424static void draw(void)
425{
426  static char frbuf[80] = "";
427
428  dojoy();
429
430  glEnable(GL_DEPTH_TEST);
431  glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
432
433  if(usetex)
434    glEnable(GL_TEXTURE_2D);
435  else
436    glDisable(GL_TEXTURE_2D);
437
438  if(fog)
439    glEnable(GL_FOG);
440  else
441    glDisable(GL_FOG);
442
443  glEnable(GL_LIGHTING);
444
445  glShadeModel(GL_SMOOTH);
446
447  glPushMatrix();
448  calcposobs();
449
450  gluLookAt(obs[0],obs[1],obs[2],
451	    obs[0]+dir[0],obs[1]+dir[1],obs[2]+dir[2],
452	    0.0,0.0,1.0);
453
454  drawlight1();
455  glCallList(basedlist);
456  drawteapot();
457  drawlight2();
458  glPopMatrix();
459
460  glDisable(GL_LIGHTING);
461  glDisable(GL_TEXTURE_2D);
462  glDisable(GL_DEPTH_TEST);
463  glDisable(GL_FOG);
464  glShadeModel(GL_FLAT);
465
466  glMatrixMode(GL_PROJECTION);
467  glLoadIdentity();
468  glOrtho(-0.5,639.5,-0.5,479.5,-1.0,1.0);
469  glMatrixMode(GL_MODELVIEW);
470  glLoadIdentity();
471
472  glColor3f(1.0,0.0,0.0);
473  glRasterPos2i(10,10);
474  printstring(GLUT_BITMAP_HELVETICA_18,frbuf);
475  glRasterPos2i(350,470);
476  printstring(GLUT_BITMAP_HELVETICA_10,"Teapot V1.2 Written by David Bucciarelli (tech.hmw@plus.it)");
477
478  if(help)
479    printhelp();
480
481  reshape(WIDTH,HEIGHT);
482
483  glutSwapBuffers();
484
485   Frames++;
486
487   {
488      GLint t = glutGet(GLUT_ELAPSED_TIME);
489      if (t - T0 >= 2000) {
490         GLfloat seconds = (t - T0) / 1000.0;
491         GLfloat fps = Frames / seconds;
492         sprintf(frbuf, "Frame rate: %f", fps);
493         printf("%s\n", frbuf);
494         T0 = t;
495         Frames = 0;
496      }
497   }
498}
499
500static void inittextures(void)
501{
502  glGenTextures(1,&t1id);
503  glBindTexture(GL_TEXTURE_2D,t1id);
504
505  glPixelStorei(GL_UNPACK_ALIGNMENT,4);
506  if (!LoadRGBMipmaps(DEMOS_DATA_DIR "tile.rgb", GL_RGB)) {
507    fprintf(stderr,"Error reading a texture.\n");
508    exit(-1);
509  }
510
511  glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_REPEAT);
512  glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_REPEAT);
513
514  glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_LINEAR);
515  glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
516
517  glTexEnvf(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);
518
519  glGenTextures(1,&t2id);
520  glBindTexture(GL_TEXTURE_2D,t2id);
521
522  glPixelTransferf(GL_RED_SCALE, 0.75);
523  glPixelTransferf(GL_RED_BIAS, 0.25);
524  glPixelTransferf(GL_GREEN_SCALE, 0.75);
525  glPixelTransferf(GL_GREEN_BIAS, 0.25);
526  glPixelTransferf(GL_BLUE_SCALE, 0.75);
527  glPixelTransferf(GL_BLUE_BIAS, 0.25);
528
529  if (!LoadRGBMipmaps(DEMOS_DATA_DIR "bw.rgb", GL_RGB)) {
530    fprintf(stderr,"Error reading a texture.\n");
531    exit(-1);
532  }
533
534  glPixelTransferf(GL_RED_SCALE, 1.0);
535  glPixelTransferf(GL_RED_BIAS, 0.0);
536  glPixelTransferf(GL_GREEN_SCALE, 1.0);
537  glPixelTransferf(GL_GREEN_BIAS, 0.0);
538  glPixelTransferf(GL_BLUE_SCALE, 1.0);
539  glPixelTransferf(GL_BLUE_BIAS, 0.0);
540
541
542  glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_REPEAT);
543  glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_REPEAT);
544
545  glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_LINEAR);
546  glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
547
548  glTexEnvf(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);
549}
550
551static void initlight(void)
552{
553  float matamb[4] ={0.5, 0.5, 0.5, 1.0};
554  float matdiff[4]={0.9, 0.2, 0.2, 1.0};
555  float matspec[4]={1.0,1.0,1.0,1.0};
556
557  float lamb[4] ={1.5, 1.5, 1.5, 1.0};
558  float ldiff[4]={1.0, 1.0, 1.0, 1.0};
559  float lspec[4]={1.0, 1.0, 1.0, 1.0};
560
561  glLightf(GL_LIGHT0,GL_SPOT_CUTOFF,70.0);
562  glLightf(GL_LIGHT0,GL_SPOT_EXPONENT,20.0);
563  glLightfv(GL_LIGHT0,GL_AMBIENT,lamb);
564  glLightfv(GL_LIGHT0,GL_DIFFUSE,ldiff);
565  glLightfv(GL_LIGHT0,GL_SPECULAR,lspec);
566
567  glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 15.0);
568  glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, matdiff);
569  glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, matspec);
570  glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, matamb);
571
572  glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lamb);
573  glEnable(GL_LIGHT0);
574}
575
576static void initdlists(void)
577{
578  GLUquadricObj *lcone,*lbase;
579  GLfloat plane[4];
580  GLfloat v0[3]={0.0,0.0,0.0};
581  GLfloat v1[3]={1.0,0.0,0.0};
582  GLfloat v2[3]={0.0,1.0,0.0};
583
584  findplane(plane,v0,v1,v2);
585  shadowmatrix(baseshadow,plane,lightpos);
586
587  teapotdlist=glGenLists(1);
588  glNewList(teapotdlist,GL_COMPILE);
589  glRotatef(90.0,1.0,0.0,0.0);
590  glCullFace(GL_FRONT);
591  glBindTexture(GL_TEXTURE_2D,t2id);
592  glutSolidTeapot(0.75);
593  glCullFace(GL_BACK);
594  glEndList();
595
596  basedlist=glGenLists(1);
597  glNewList(basedlist,GL_COMPILE);
598  drawbase();
599  glEndList();
600
601  lightdlist=glGenLists(1);
602  glNewList(lightdlist,GL_COMPILE);
603  glDisable(GL_LIGHTING);
604
605  lcone=gluNewQuadric();
606  lbase=gluNewQuadric();
607  glRotatef(45.0,0.0,1.0,0.0);
608
609  glColor3f(1.0,1.0,1.0);
610  glCullFace(GL_FRONT);
611  gluDisk(lbase,0.0,0.2,12.0,1.0);
612  glCullFace(GL_BACK);
613
614  glColor3f(0.5,0.0,0.0);
615  gluCylinder(lcone,0.2,0.0,0.5,12,1);
616
617  gluDeleteQuadric(lcone);
618  gluDeleteQuadric(lbase);
619
620  glEnable(GL_LIGHTING);
621  glEndList();
622}
623
624int main(int ac, char **av)
625{
626  float fogcolor[4]={0.025,0.025,0.025,1.0};
627
628  fprintf(stderr,"Teapot V1.2\nWritten by David Bucciarelli (tech.hmw@plus.it)\n");
629
630  /*
631    if(!SetPriorityClass(GetCurrentProcess(),REALTIME_PRIORITY_CLASS)) {
632    fprintf(stderr,"Error setting the process class.\n");
633    return 0;
634    }
635
636    if(!SetThreadPriority(GetCurrentThread(),THREAD_PRIORITY_TIME_CRITICAL)) {
637    fprintf(stderr,"Error setting the process priority.\n");
638    return 0;
639    }
640    */
641
642  glutInitWindowSize(WIDTH,HEIGHT);
643  glutInit(&ac,av);
644
645  glutInitDisplayMode(GLUT_RGB|GLUT_DEPTH|GLUT_DOUBLE);
646
647  if(!(win=glutCreateWindow("Teapot"))) {
648    fprintf(stderr,"Error, couldn't open window\n");
649	return -1;
650  }
651
652  reshape(WIDTH,HEIGHT);
653
654  glShadeModel(GL_SMOOTH);
655  glEnable(GL_DEPTH_TEST);
656  glEnable(GL_CULL_FACE);
657  glEnable(GL_TEXTURE_2D);
658
659  glEnable(GL_FOG);
660  glFogi(GL_FOG_MODE,GL_EXP2);
661  glFogfv(GL_FOG_COLOR,fogcolor);
662
663  glFogf(GL_FOG_DENSITY,0.04);
664  glHint(GL_FOG_HINT,GL_NICEST);
665  glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
666
667  calcposobs();
668
669  inittextures();
670  initlight();
671
672  initdlists();
673
674  glClearColor(fogcolor[0],fogcolor[1],fogcolor[2],fogcolor[3]);
675
676  glutReshapeFunc(reshape);
677  glutDisplayFunc(draw);
678  glutKeyboardFunc(key);
679  glutSpecialFunc(special);
680  glutIdleFunc(draw);
681
682  glutMainLoop();
683  cleanup();
684
685  return 0;
686}
687