progs/demos/multiarb.c

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