progs/demos/multiarb.c

   1 /* $Id: multiarb.c,v 1.8 2000/12/24 22:53:54 pesco Exp $ */
   2
   3 /*
   4  * GL_ARB_multitexture demo
   5  *
   6  * Command line options:
   7  *    -info      print GL implementation information
   8  *
   9  *
  10  * Brian Paul  November 1998  This program is in the public domain.
  11  */
  12
  13 /*
  14  * $Log: multiarb.c,v $
  15  * Revision 1.8  2000/12/24 22:53:54  pesco
  16  * * demos/Makefile.am (INCLUDES): Added -I$(top_srcdir)/util.
  17  * * demos/Makefile.X11, demos/Makefile.BeOS-R4, demos/Makefile.cygnus:
  18  * Essentially the same.
  19  * Program files updated to include "readtex.c", not "../util/readtex.c".
  20  * * demos/reflect.c: Likewise for "showbuffer.c".
  21  *
  22  *
  23  * * Makefile.am (EXTRA_DIST): Added top-level regular files.
  24  *
  25  * * include/GL/Makefile.am (INC_X11): Added glxext.h.
  26  *
  27  *
  28  * * src/GGI/include/ggi/mesa/Makefile.am (EXTRA_HEADERS): Include
  29  * Mesa GGI headers in dist even if HAVE_GGI is not given.
  30  *
  31  * * configure.in: Look for GLUT and demo source dirs in $srcdir.
  32  *
  33  * * src/swrast/Makefile.am (libMesaSwrast_la_SOURCES): Set to *.[ch].
  34  * More source list updates in various Makefile.am's.
  35  *
  36  * * Makefile.am (dist-hook): Remove CVS directory from distribution.
  37  * (DIST_SUBDIRS): List all possible subdirs here.
  38  * (SUBDIRS): Only list subdirs selected for build again.
  39  * The above two applied to all subdir Makefile.am's also.
  40  *
  41  * Revision 1.7  2000/11/01 16:02:01  brianp
  42  * print number of texture units
  43  *
  44  * Revision 1.6  2000/05/23 23:21:00  brianp
  45  * set default window pos
  46  *
  47  * Revision 1.5  2000/02/02 17:31:45  brianp
  48  * changed > to >=
  49  *
  50  * Revision 1.4  2000/02/02 01:07:21  brianp
  51  * limit Drift to [0, 1]
  52  *
  53  * Revision 1.3  1999/10/21 16:40:32  brianp
  54  * added -info command line option
  55  *
  56  * Revision 1.2  1999/10/13 12:02:13  brianp
  57  * use texture objects now
  58  *
  59  * Revision 1.1.1.1  1999/08/19 00:55:40  jtg
  60  * Imported sources
  61  *
  62  * Revision 1.3  1999/03/28 18:20:49  brianp
  63  * minor clean-up
  64  *
  65  * Revision 1.2  1998/11/05 04:34:04  brianp
  66  * moved image files to ../images/ directory
  67  *
  68  * Revision 1.1  1998/11/03 01:36:33  brianp
  69  * Initial revision
  70  *
  71  */
  72
  73
  74 #include <math.h>
  75 #include <stdio.h>
  76 #include <stdlib.h>
  77 #include <string.h>
  78 #include <GL/glut.h>
  79
  80 #include "readtex.c"   /* I know, this is a hack. */
  81
  82 #define TEXTURE_1_FILE "../images/girl.rgb"
  83 #define TEXTURE_2_FILE "../images/reflect.rgb"
  84
  85 #define TEX0 1
  86 #define TEX1 2
  87 #define TEXBOTH 3
  88 #define ANIMATE 10
  89 #define QUIT 100
  90
  91 static GLboolean Animate = GL_TRUE;
  92
  93 static GLfloat Drift = 0.0;
  94 static GLfloat Xrot = 20.0, Yrot = 30.0, Zrot = 0.0;
  95
  96
  97
  98 static void Idle( void )
  99 {
 100    if (Animate) {
 101       Drift += 0.05;
 102       if (Drift >= 1.0)
 103          Drift = 0.0;
 104
 105 #ifdef GL_ARB_multitexture
 106       glActiveTextureARB(GL_TEXTURE0_ARB);
 107 #endif
 108       glMatrixMode(GL_TEXTURE);
 109       glLoadIdentity();
 110       glTranslatef(Drift, 0.0, 0.0);
 111       glMatrixMode(GL_MODELVIEW);
 112
 113 #ifdef GL_ARB_multitexture
 114       glActiveTextureARB(GL_TEXTURE1_ARB);
 115 #endif
 116       glMatrixMode(GL_TEXTURE);
 117       glLoadIdentity();
 118       glTranslatef(0.0, Drift, 0.0);
 119       glMatrixMode(GL_MODELVIEW);
 120
 121       glutPostRedisplay();
 122    }
 123 }
 124
 125
 126 static void DrawObject(void)
 127 {
 128    glBegin(GL_QUADS);
 129
 130 #ifdef GL_ARB_multitexture
 131    glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0, 0.0);
 132    glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0, 0.0);
 133    glVertex2f(-1.0, -1.0);
 134
 135    glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 2.0, 0.0);
 136    glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0, 0.0);
 137    glVertex2f(1.0, -1.0);
 138
 139    glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 2.0, 2.0);
 140    glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0, 1.0);
 141    glVertex2f(1.0, 1.0);
 142
 143    glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0, 2.0);
 144    glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0, 1.0);
 145    glVertex2f(-1.0, 1.0);
 146 #else
 147    glTexCoord2f(0.0, 0.0);
 148    glVertex2f(-1.0, -1.0);
 149
 150    glTexCoord2f(1.0, 0.0);
 151    glVertex2f(1.0, -1.0);
 152
 153    glTexCoord2f(1.0, 1.0);
 154    glVertex2f(1.0, 1.0);
 155
 156    glTexCoord2f(0.0, 1.0);
 157    glVertex2f(-1.0, 1.0);
 158 #endif
 159
 160    glEnd();
 161 }
 162
 163
 164
 165 static void Display( void )
 166 {
 167    glClear( GL_COLOR_BUFFER_BIT );
 168
 169    glPushMatrix();
 170       glRotatef(Xrot, 1.0, 0.0, 0.0);
 171       glRotatef(Yrot, 0.0, 1.0, 0.0);
 172       glRotatef(Zrot, 0.0, 0.0, 1.0);
 173       glScalef(5.0, 5.0, 5.0);
 174       DrawObject();
 175    glPopMatrix();
 176
 177    glutSwapBuffers();
 178 }
 179
 180
 181 static void Reshape( int width, int height )
 182 {
 183    glViewport( 0, 0, width, height );
 184    glMatrixMode( GL_PROJECTION );
 185    glLoadIdentity();
 186    glFrustum( -1.0, 1.0, -1.0, 1.0, 10.0, 100.0 );
 187    /*glOrtho( -6.0, 6.0, -6.0, 6.0, 10.0, 100.0 );*/
 188    glMatrixMode( GL_MODELVIEW );
 189    glLoadIdentity();
 190    glTranslatef( 0.0, 0.0, -70.0 );
 191 }
 192
 193
 194 static void ModeMenu(int entry)
 195 {
 196    GLboolean enable0 = GL_FALSE, enable1 = GL_FALSE;
 197    if (entry==TEX0) {
 198       enable0 = GL_TRUE;
 199    }
 200    else if (entry==TEX1) {
 201       enable1 = GL_TRUE;
 202    }
 203    else if (entry==TEXBOTH) {
 204       enable0 = GL_TRUE;
 205       enable1 = GL_TRUE;
 206    }
 207    else if (entry==ANIMATE) {
 208       Animate = !Animate;
 209    }
 210    else if (entry==QUIT) {
 211       exit(0);
 212    }
 213
 214    if (entry != ANIMATE) {
 215 #ifdef GL_ARB_multitexture
 216       glActiveTextureARB(GL_TEXTURE0_ARB);
 217 #endif
 218       if (enable0) {
 219          glEnable(GL_TEXTURE_2D);
 220       }
 221       else
 222          glDisable(GL_TEXTURE_2D);
 223
 224 #ifdef GL_ARB_multitexture
 225       glActiveTextureARB(GL_TEXTURE1_ARB);
 226 #endif
 227       if (enable1) {
 228          glEnable(GL_TEXTURE_2D);
 229       }
 230       else
 231          glDisable(GL_TEXTURE_2D);
 232    }
 233
 234    glutPostRedisplay();
 235 }
 236
 237
 238 static void Key( unsigned char key, int x, int y )
 239 {
 240    (void) x;
 241    (void) y;
 242    switch (key) {
 243       case 27:
 244          exit(0);
 245          break;
 246    }
 247    glutPostRedisplay();
 248 }
 249
 250
 251 static void SpecialKey( int key, int x, int y )
 252 {
 253    float step = 3.0;
 254    (void) x;
 255    (void) y;
 256
 257    switch (key) {
 258       case GLUT_KEY_UP:
 259          Xrot += step;
 260          break;
 261       case GLUT_KEY_DOWN:
 262          Xrot -= step;
 263          break;
 264       case GLUT_KEY_LEFT:
 265          Yrot += step;
 266          break;
 267       case GLUT_KEY_RIGHT:
 268          Yrot -= step;
 269          break;
 270    }
 271    glutPostRedisplay();
 272 }
 273
 274
 275 static void Init( int argc, char *argv[] )
 276 {
 277    GLuint texObj[2];
 278    GLint units;
 279
 280    const char *exten = (const char *) glGetString(GL_EXTENSIONS);
 281    if (!strstr(exten, "GL_ARB_multitexture")) {
 282       printf("Sorry, GL_ARB_multitexture not supported by this renderer.\n");
 283       exit(1);
 284    }
 285
 286    glGetIntegerv(GL_MAX_TEXTURE_UNITS_ARB, &units);
 287    printf("%d texture units supported\n", units);
 288
 289    /* allocate two texture objects */
 290    glGenTextures(2, texObj);
 291
 292    /* setup texture obj 0 */
 293    glBindTexture(GL_TEXTURE_2D, texObj[0]);
 294 #ifdef LINEAR_FILTER
 295    /* linear filtering looks much nicer but is much slower for Mesa */
 296    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 297    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 298 #else
 299    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 300    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 301 #endif
 302
 303    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 304
 305    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 306
 307    if (!LoadRGBMipmaps(TEXTURE_1_FILE, GL_RGB)) {
 308       printf("Error: couldn't load texture image\n");
 309       exit(1);
 310    }
 311
 312
 313    /* setup texture obj 1 */
 314    glBindTexture(GL_TEXTURE_2D, texObj[1]);
 315 #ifdef LINEAR_FILTER
 316    /* linear filtering looks much nicer but is much slower for Mesa */
 317    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 318    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 319 #else
 320    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 321    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 322 #endif
 323
 324    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 325
 326    if (!LoadRGBMipmaps(TEXTURE_2_FILE, GL_RGB)) {
 327       printf("Error: couldn't load texture image\n");
 328       exit(1);
 329    }
 330
 331
 332    /* now bind the texture objects to the respective texture units */
 333 #ifdef GL_ARB_multitexture
 334    glActiveTextureARB(GL_TEXTURE0_ARB);
 335    glBindTexture(GL_TEXTURE_2D, texObj[0]);
 336    glActiveTextureARB(GL_TEXTURE1_ARB);
 337    glBindTexture(GL_TEXTURE_2D, texObj[1]);
 338 #endif
 339
 340    glShadeModel(GL_FLAT);
 341    glClearColor(0.3, 0.3, 0.4, 1.0);
 342
 343    ModeMenu(TEXBOTH);
 344
 345    if (argc > 1 && strcmp(argv[1], "-info")==0) {
 346       printf("GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
 347       printf("GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
 348       printf("GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
 349       printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
 350    }
 351 }
 352
 353
 354 int main( int argc, char *argv[] )
 355 {
 356    glutInit( &argc, argv );
 357    glutInitWindowSize( 300, 300 );
 358    glutInitWindowPosition( 0, 0 );
 359    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
 360    glutCreateWindow(argv[0] );
 361
 362    Init( argc, argv );
 363
 364    glutReshapeFunc( Reshape );
 365    glutKeyboardFunc( Key );
 366    glutSpecialFunc( SpecialKey );
 367    glutDisplayFunc( Display );
 368    glutIdleFunc( Idle );
 369
 370    glutCreateMenu(ModeMenu);
 371    glutAddMenuEntry("Texture 0", TEX0);
 372    glutAddMenuEntry("Texture 1", TEX1);
 373    glutAddMenuEntry("Multi-texture", TEXBOTH);
 374    glutAddMenuEntry("Toggle Animation", ANIMATE);
 375    glutAddMenuEntry("Quit", QUIT);
 376    glutAttachMenu(GLUT_RIGHT_BUTTON);
 377
 378    glutMainLoop();
 379    return 0;
 380 }