progs/demos/multiarb.c

   1 /* $Id: multiarb.c,v 1.10 2001/06/20 19:12:30 brianp 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 1.10  2001/06/20 19:12:30  brianp
  16  * also print GL_MAX_TEXTURE_SIZE
  17  *
  18  * Revision 1.9  2001/06/13 14:33:16  brianp
  19  * moved glTexEnvi calls to better logical locations
  20  *
  21  * Revision 1.8  2000/12/24 22:53:54  pesco
  22  * * demos/Makefile.am (INCLUDES): Added -I$(top_srcdir)/util.
  23  * * demos/Makefile.X11, demos/Makefile.BeOS-R4, demos/Makefile.cygnus:
  24  * Essentially the same.
  25  * Program files updated to include "readtex.c", not "../util/readtex.c".
  26  * * demos/reflect.c: Likewise for "showbuffer.c".
  27  *
  28  *
  29  * * Makefile.am (EXTRA_DIST): Added top-level regular files.
  30  *
  31  * * include/GL/Makefile.am (INC_X11): Added glxext.h.
  32  *
  33  *
  34  * * src/GGI/include/ggi/mesa/Makefile.am (EXTRA_HEADERS): Include
  35  * Mesa GGI headers in dist even if HAVE_GGI is not given.
  36  *
  37  * * configure.in: Look for GLUT and demo source dirs in $srcdir.
  38  *
  39  * * src/swrast/Makefile.am (libMesaSwrast_la_SOURCES): Set to *.[ch].
  40  * More source list updates in various Makefile.am's.
  41  *
  42  * * Makefile.am (dist-hook): Remove CVS directory from distribution.
  43  * (DIST_SUBDIRS): List all possible subdirs here.
  44  * (SUBDIRS): Only list subdirs selected for build again.
  45  * The above two applied to all subdir Makefile.am's also.
  46  *
  47  * Revision 1.7  2000/11/01 16:02:01  brianp
  48  * print number of texture units
  49  *
  50  * Revision 1.6  2000/05/23 23:21:00  brianp
  51  * set default window pos
  52  *
  53  * Revision 1.5  2000/02/02 17:31:45  brianp
  54  * changed > to >=
  55  *
  56  * Revision 1.4  2000/02/02 01:07:21  brianp
  57  * limit Drift to [0, 1]
  58  *
  59  * Revision 1.3  1999/10/21 16:40:32  brianp
  60  * added -info command line option
  61  *
  62  * Revision 1.2  1999/10/13 12:02:13  brianp
  63  * use texture objects now
  64  *
  65  * Revision 1.1.1.1  1999/08/19 00:55:40  jtg
  66  * Imported sources
  67  *
  68  * Revision 1.3  1999/03/28 18:20:49  brianp
  69  * minor clean-up
  70  *
  71  * Revision 1.2  1998/11/05 04:34:04  brianp
  72  * moved image files to ../images/ directory
  73  *
  74  * Revision 1.1  1998/11/03 01:36:33  brianp
  75  * Initial revision
  76  *
  77  */
  78
  79
  80 #include <math.h>
  81 #include <stdio.h>
  82 #include <stdlib.h>
  83 #include <string.h>
  84 #include <GL/glut.h>
  85
  86 #include "readtex.c"   /* I know, this is a hack. */
  87
  88 #define TEXTURE_1_FILE "../images/girl.rgb"
  89 #define TEXTURE_2_FILE "../images/reflect.rgb"
  90
  91 #define TEX0 1
  92 #define TEX1 2
  93 #define TEXBOTH 3
  94 #define ANIMATE 10
  95 #define QUIT 100
  96
  97 static GLboolean Animate = GL_TRUE;
  98
  99 static GLfloat Drift = 0.0;
 100 static GLfloat Xrot = 20.0, Yrot = 30.0, Zrot = 0.0;
 101
 102
 103
 104 static void Idle( void )
 105 {
 106    if (Animate) {
 107       Drift += 0.05;
 108       if (Drift >= 1.0)
 109          Drift = 0.0;
 110
 111 #ifdef GL_ARB_multitexture
 112       glActiveTextureARB(GL_TEXTURE0_ARB);
 113 #endif
 114       glMatrixMode(GL_TEXTURE);
 115       glLoadIdentity();
 116       glTranslatef(Drift, 0.0, 0.0);
 117       glMatrixMode(GL_MODELVIEW);
 118
 119 #ifdef GL_ARB_multitexture
 120       glActiveTextureARB(GL_TEXTURE1_ARB);
 121 #endif
 122       glMatrixMode(GL_TEXTURE);
 123       glLoadIdentity();
 124       glTranslatef(0.0, Drift, 0.0);
 125       glMatrixMode(GL_MODELVIEW);
 126
 127       glutPostRedisplay();
 128    }
 129 }
 130
 131
 132 static void DrawObject(void)
 133 {
 134    glBegin(GL_QUADS);
 135
 136 #ifdef GL_ARB_multitexture
 137    glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0, 0.0);
 138    glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0, 0.0);
 139    glVertex2f(-1.0, -1.0);
 140
 141    glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 2.0, 0.0);
 142    glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0, 0.0);
 143    glVertex2f(1.0, -1.0);
 144
 145    glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 2.0, 2.0);
 146    glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0, 1.0);
 147    glVertex2f(1.0, 1.0);
 148
 149    glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0, 2.0);
 150    glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0, 1.0);
 151    glVertex2f(-1.0, 1.0);
 152 #else
 153    glTexCoord2f(0.0, 0.0);
 154    glVertex2f(-1.0, -1.0);
 155
 156    glTexCoord2f(1.0, 0.0);
 157    glVertex2f(1.0, -1.0);
 158
 159    glTexCoord2f(1.0, 1.0);
 160    glVertex2f(1.0, 1.0);
 161
 162    glTexCoord2f(0.0, 1.0);
 163    glVertex2f(-1.0, 1.0);
 164 #endif
 165
 166    glEnd();
 167 }
 168
 169
 170
 171 static void Display( void )
 172 {
 173    glClear( GL_COLOR_BUFFER_BIT );
 174
 175    glPushMatrix();
 176       glRotatef(Xrot, 1.0, 0.0, 0.0);
 177       glRotatef(Yrot, 0.0, 1.0, 0.0);
 178       glRotatef(Zrot, 0.0, 0.0, 1.0);
 179       glScalef(5.0, 5.0, 5.0);
 180       DrawObject();
 181    glPopMatrix();
 182
 183    glutSwapBuffers();
 184 }
 185
 186
 187 static void Reshape( int width, int height )
 188 {
 189    glViewport( 0, 0, width, height );
 190    glMatrixMode( GL_PROJECTION );
 191    glLoadIdentity();
 192    glFrustum( -1.0, 1.0, -1.0, 1.0, 10.0, 100.0 );
 193    /*glOrtho( -6.0, 6.0, -6.0, 6.0, 10.0, 100.0 );*/
 194    glMatrixMode( GL_MODELVIEW );
 195    glLoadIdentity();
 196    glTranslatef( 0.0, 0.0, -70.0 );
 197 }
 198
 199
 200 static void ModeMenu(int entry)
 201 {
 202    GLboolean enable0 = GL_FALSE, enable1 = GL_FALSE;
 203    if (entry==TEX0) {
 204       enable0 = GL_TRUE;
 205    }
 206    else if (entry==TEX1) {
 207       enable1 = GL_TRUE;
 208    }
 209    else if (entry==TEXBOTH) {
 210       enable0 = GL_TRUE;
 211       enable1 = GL_TRUE;
 212    }
 213    else if (entry==ANIMATE) {
 214       Animate = !Animate;
 215    }
 216    else if (entry==QUIT) {
 217       exit(0);
 218    }
 219
 220    if (entry != ANIMATE) {
 221 #ifdef GL_ARB_multitexture
 222       glActiveTextureARB(GL_TEXTURE0_ARB);
 223 #endif
 224       if (enable0) {
 225          glEnable(GL_TEXTURE_2D);
 226       }
 227       else
 228          glDisable(GL_TEXTURE_2D);
 229
 230 #ifdef GL_ARB_multitexture
 231       glActiveTextureARB(GL_TEXTURE1_ARB);
 232 #endif
 233       if (enable1) {
 234          glEnable(GL_TEXTURE_2D);
 235       }
 236       else
 237          glDisable(GL_TEXTURE_2D);
 238    }
 239
 240    glutPostRedisplay();
 241 }
 242
 243
 244 static void Key( unsigned char key, int x, int y )
 245 {
 246    (void) x;
 247    (void) y;
 248    switch (key) {
 249       case 27:
 250          exit(0);
 251          break;
 252    }
 253    glutPostRedisplay();
 254 }
 255
 256
 257 static void SpecialKey( int key, int x, int y )
 258 {
 259    float step = 3.0;
 260    (void) x;
 261    (void) y;
 262
 263    switch (key) {
 264       case GLUT_KEY_UP:
 265          Xrot += step;
 266          break;
 267       case GLUT_KEY_DOWN:
 268          Xrot -= step;
 269          break;
 270       case GLUT_KEY_LEFT:
 271          Yrot += step;
 272          break;
 273       case GLUT_KEY_RIGHT:
 274          Yrot -= step;
 275          break;
 276    }
 277    glutPostRedisplay();
 278 }
 279
 280
 281 static void Init( int argc, char *argv[] )
 282 {
 283    GLuint texObj[2];
 284    GLint units, size;
 285
 286    const char *exten = (const char *) glGetString(GL_EXTENSIONS);
 287    if (!strstr(exten, "GL_ARB_multitexture")) {
 288       printf("Sorry, GL_ARB_multitexture not supported by this renderer.\n");
 289       exit(1);
 290    }
 291
 292    glGetIntegerv(GL_MAX_TEXTURE_UNITS_ARB, &units);
 293    printf("%d texture units supported\n", units);
 294
 295    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &size);
 296    printf("%d x %d max texture size\n", size, size);
 297
 298    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 299
 300    /* allocate two texture objects */
 301    glGenTextures(2, texObj);
 302
 303    /* setup texture obj 0 */
 304    glBindTexture(GL_TEXTURE_2D, texObj[0]);
 305 #ifdef LINEAR_FILTER
 306    /* linear filtering looks much nicer but is much slower for Mesa */
 307    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 308    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 309 #else
 310    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 311    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 312 #endif
 313    if (!LoadRGBMipmaps(TEXTURE_1_FILE, GL_RGB)) {
 314       printf("Error: couldn't load texture image\n");
 315       exit(1);
 316    }
 317
 318
 319    /* setup texture obj 1 */
 320    glBindTexture(GL_TEXTURE_2D, texObj[1]);
 321 #ifdef LINEAR_FILTER
 322    /* linear filtering looks much nicer but is much slower for Mesa */
 323    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 324    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 325 #else
 326    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 327    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 328 #endif
 329    if (!LoadRGBMipmaps(TEXTURE_2_FILE, GL_RGB)) {
 330       printf("Error: couldn't load texture image\n");
 331       exit(1);
 332    }
 333
 334
 335    /* now bind the texture objects to the respective texture units */
 336 #ifdef GL_ARB_multitexture
 337    glActiveTextureARB(GL_TEXTURE0_ARB);
 338    glBindTexture(GL_TEXTURE_2D, texObj[0]);
 339    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 340    glActiveTextureARB(GL_TEXTURE1_ARB);
 341    glBindTexture(GL_TEXTURE_2D, texObj[1]);
 342    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 343 #endif
 344
 345    glShadeModel(GL_FLAT);
 346    glClearColor(0.3, 0.3, 0.4, 1.0);
 347
 348    ModeMenu(TEXBOTH);
 349
 350    if (argc > 1 && strcmp(argv[1], "-info")==0) {
 351       printf("GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
 352       printf("GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
 353       printf("GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
 354       printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
 355    }
 356 }
 357
 358
 359 int main( int argc, char *argv[] )
 360 {
 361    glutInit( &argc, argv );
 362    glutInitWindowSize( 300, 300 );
 363    glutInitWindowPosition( 0, 0 );
 364    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
 365    glutCreateWindow(argv[0] );
 366
 367    Init( argc, argv );
 368
 369    glutReshapeFunc( Reshape );
 370    glutKeyboardFunc( Key );
 371    glutSpecialFunc( SpecialKey );
 372    glutDisplayFunc( Display );
 373    glutIdleFunc( Idle );
 374
 375    glutCreateMenu(ModeMenu);
 376    glutAddMenuEntry("Texture 0", TEX0);
 377    glutAddMenuEntry("Texture 1", TEX1);
 378    glutAddMenuEntry("Multi-texture", TEXBOTH);
 379    glutAddMenuEntry("Toggle Animation", ANIMATE);
 380    glutAddMenuEntry("Quit", QUIT);
 381    glutAttachMenu(GLUT_RIGHT_BUTTON);
 382
 383    glutMainLoop();
 384    return 0;
 385 }