progs/tests/multipal.c

   1 /* $Id: multipal.c,v 1.6 2003/12/08 09:03:36 joukj Exp $ */
   2
   3 /*
   4  * Test multitexture and paletted textures.
   5  */
   6
   7 #include <assert.h>
   8 #include <math.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #ifdef __VMS
  13 # include <stddef.h>    /* for ptrdiff_t, referenced by GL.h when GL_GLEXT_LEGACY defined */
  14 #else
  15 # include <malloc.h>    /* for ptrdiff_t, referenced by GL.h when GL_GLEXT_LEGACY defined */
  16 #endif
  17 #ifdef _WIN32
  18 #include <windows.h>
  19 #endif
  20 #define GL_GLEXT_LEGACY
  21 #include <GL/glut.h>
  22
  23 #include "../util/readtex.c"   /* I know, this is a hack. */
  24
  25 #define TEXTURE_1_FILE "../images/tile.rgb"
  26 #define TEXTURE_2_FILE "../images/reflect.rgb"
  27
  28 #define TEX0 1
  29 #define TEX1 2
  30 #define TEXBOTH 3
  31 #define ANIMATE 10
  32 #define QUIT 100
  33
  34 static GLboolean Animate = GL_TRUE;
  35
  36 static GLfloat Drift = 0.0;
  37 static GLfloat Xrot = 20.0, Yrot = 30.0, Zrot = 0.0;
  38
  39
  40
  41 static void Idle( void )
  42 {
  43    if (Animate) {
  44       Drift += 0.05;
  45       if (Drift >= 1.0)
  46          Drift = 0.0;
  47
  48 #ifdef GL_ARB_multitexture
  49       glActiveTextureARB(GL_TEXTURE0_ARB);
  50 #endif
  51       glMatrixMode(GL_TEXTURE);
  52       glLoadIdentity();
  53       glTranslatef(Drift, 0.0, 0.0);
  54       glMatrixMode(GL_MODELVIEW);
  55
  56 #ifdef GL_ARB_multitexture
  57       glActiveTextureARB(GL_TEXTURE1_ARB);
  58 #endif
  59       glMatrixMode(GL_TEXTURE);
  60       glLoadIdentity();
  61       glTranslatef(0.0, Drift, 0.0);
  62       glMatrixMode(GL_MODELVIEW);
  63
  64       glutPostRedisplay();
  65    }
  66 }
  67
  68
  69 static void DrawObject(void)
  70 {
  71    glBegin(GL_QUADS);
  72
  73 #ifdef GL_ARB_multitexture
  74    glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0, 0.0);
  75    glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0, 0.0);
  76    glVertex2f(-1.0, -1.0);
  77
  78    glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 2.0, 0.0);
  79    glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0, 0.0);
  80    glVertex2f(1.0, -1.0);
  81
  82    glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 2.0, 2.0);
  83    glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0, 1.0);
  84    glVertex2f(1.0, 1.0);
  85
  86    glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0, 2.0);
  87    glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0, 1.0);
  88    glVertex2f(-1.0, 1.0);
  89 #else
  90    glTexCoord2f(0.0, 0.0);
  91    glVertex2f(-1.0, -1.0);
  92
  93    glTexCoord2f(1.0, 0.0);
  94    glVertex2f(1.0, -1.0);
  95
  96    glTexCoord2f(1.0, 1.0);
  97    glVertex2f(1.0, 1.0);
  98
  99    glTexCoord2f(0.0, 1.0);
 100    glVertex2f(-1.0, 1.0);
 101 #endif
 102
 103    glEnd();
 104 }
 105
 106
 107
 108 static void Display( void )
 109 {
 110    glClear( GL_COLOR_BUFFER_BIT );
 111
 112    glPushMatrix();
 113       glRotatef(Xrot, 1.0, 0.0, 0.0);
 114       glRotatef(Yrot, 0.0, 1.0, 0.0);
 115       glRotatef(Zrot, 0.0, 0.0, 1.0);
 116       glScalef(5.0, 5.0, 5.0);
 117       DrawObject();
 118    glPopMatrix();
 119
 120    glutSwapBuffers();
 121 }
 122
 123
 124 static void Reshape( int width, int height )
 125 {
 126    glViewport( 0, 0, width, height );
 127    glMatrixMode( GL_PROJECTION );
 128    glLoadIdentity();
 129    glFrustum( -1.0, 1.0, -1.0, 1.0, 10.0, 100.0 );
 130    /*glOrtho( -6.0, 6.0, -6.0, 6.0, 10.0, 100.0 );*/
 131    glMatrixMode( GL_MODELVIEW );
 132    glLoadIdentity();
 133    glTranslatef( 0.0, 0.0, -70.0 );
 134 }
 135
 136
 137 static void ModeMenu(int entry)
 138 {
 139    GLboolean enable0 = GL_FALSE, enable1 = GL_FALSE;
 140    if (entry==TEX0) {
 141       enable0 = GL_TRUE;
 142    }
 143    else if (entry==TEX1) {
 144       enable1 = GL_TRUE;
 145    }
 146    else if (entry==TEXBOTH) {
 147       enable0 = GL_TRUE;
 148       enable1 = GL_TRUE;
 149    }
 150    else if (entry==ANIMATE) {
 151       Animate = !Animate;
 152    }
 153    else if (entry==QUIT) {
 154       exit(0);
 155    }
 156
 157    if (entry != ANIMATE) {
 158 #ifdef GL_ARB_multitexture
 159       glActiveTextureARB(GL_TEXTURE0_ARB);
 160 #endif
 161       if (enable0) {
 162          glEnable(GL_TEXTURE_2D);
 163       }
 164       else
 165          glDisable(GL_TEXTURE_2D);
 166
 167 #ifdef GL_ARB_multitexture
 168       glActiveTextureARB(GL_TEXTURE1_ARB);
 169 #endif
 170       if (enable1) {
 171          glEnable(GL_TEXTURE_2D);
 172       }
 173       else
 174          glDisable(GL_TEXTURE_2D);
 175    }
 176
 177    glutPostRedisplay();
 178 }
 179
 180
 181 static void Key( unsigned char key, int x, int y )
 182 {
 183    (void) x;
 184    (void) y;
 185    switch (key) {
 186       case 27:
 187          exit(0);
 188          break;
 189    }
 190    glutPostRedisplay();
 191 }
 192
 193
 194 static void SpecialKey( int key, int x, int y )
 195 {
 196    float step = 3.0;
 197    (void) x;
 198    (void) y;
 199
 200    switch (key) {
 201       case GLUT_KEY_UP:
 202          Xrot += step;
 203          break;
 204       case GLUT_KEY_DOWN:
 205          Xrot -= step;
 206          break;
 207       case GLUT_KEY_LEFT:
 208          Yrot += step;
 209          break;
 210       case GLUT_KEY_RIGHT:
 211          Yrot -= step;
 212          break;
 213    }
 214    glutPostRedisplay();
 215 }
 216
 217
 218 static void load_tex(const char *fname, int channel)
 219 {
 220    GLubyte *image;
 221    GLenum format;
 222    GLint w, h;
 223    GLubyte *grayImage;
 224    int i;
 225    GLubyte table[256][4];
 226
 227    image = LoadRGBImage(fname, &w, &h, &format);
 228    if (!image)
 229       exit(1);
 230
 231    printf("%s %d x %d\n", fname, w, h);
 232    grayImage = malloc(w * h * 1);
 233    assert(grayImage);
 234    for (i = 0; i < w * h; i++) {
 235       int g = (image[i*3+0] + image[i*3+1] + image[i*3+2]) / 3;
 236       assert(g < 256);
 237       grayImage[i] = g;
 238    }
 239
 240    glTexImage2D(GL_TEXTURE_2D, 0, GL_COLOR_INDEX, w, h, 0, GL_COLOR_INDEX,
 241                 GL_UNSIGNED_BYTE, grayImage);
 242
 243    for (i = 0; i < 256; i++) {
 244       table[i][0] = channel ? i : 0;
 245       table[i][1] = i;
 246       table[i][2] = channel ? 0 : i;
 247       table[i][3] = 255;
 248    }
 249
 250    glColorTableEXT(GL_TEXTURE_2D,    /* target */
 251                    GL_RGBA,          /* internal format */
 252                    256,              /* table size */
 253                    GL_RGBA,          /* table format */
 254                    GL_UNSIGNED_BYTE, /* table type */
 255                    table);           /* the color table */
 256
 257    free(grayImage);
 258    free(image);
 259 }
 260
 261
 262
 263 static void Init( int argc, char *argv[] )
 264 {
 265    GLuint texObj[2];
 266    GLint units;
 267
 268    if (!glutExtensionSupported("GL_ARB_multitexture")) {
 269       printf("Sorry, GL_ARB_multitexture not supported by this renderer.\n");
 270       exit(1);
 271    }
 272    if (!glutExtensionSupported("GL_EXT_paletted_texture")) {
 273       printf("Sorry, GL_EXT_paletted_texture not supported by this renderer.\n");
 274       exit(1);
 275    }
 276
 277    glGetIntegerv(GL_MAX_TEXTURE_UNITS_ARB, &units);
 278    printf("%d texture units supported\n", units);
 279
 280    /* allocate two texture objects */
 281    glGenTextures(2, texObj);
 282
 283    /* setup texture obj 0 */
 284    glBindTexture(GL_TEXTURE_2D, texObj[0]);
 285 #ifdef LINEAR_FILTER
 286    /* linear filtering looks much nicer but is much slower for Mesa */
 287    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 288    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 289 foo
 290 #else
 291    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 292    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 293 #endif
 294
 295    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 296
 297    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 298
 299    load_tex(TEXTURE_1_FILE, 0);
 300 #if 0
 301    if (!LoadRGBMipmaps(TEXTURE_1_FILE, GL_RGB)) {
 302       printf("Error: couldn't load texture image\n");
 303       exit(1);
 304    }
 305 #endif
 306
 307    /* setup texture obj 1 */
 308    glBindTexture(GL_TEXTURE_2D, texObj[1]);
 309 #ifdef LINEAR_FILTER
 310    /* linear filtering looks much nicer but is much slower for Mesa */
 311    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 312    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 313 foo
 314 #else
 315    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 316    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 317 #endif
 318
 319    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 320
 321    load_tex(TEXTURE_2_FILE, 1);
 322 #if 0
 323    if (!LoadRGBMipmaps(TEXTURE_2_FILE, GL_RGB)) {
 324       printf("Error: couldn't load texture image\n");
 325       exit(1);
 326    }
 327 #endif
 328
 329    /* now bind the texture objects to the respective texture units */
 330 #ifdef GL_ARB_multitexture
 331    glActiveTextureARB(GL_TEXTURE0_ARB);
 332    glBindTexture(GL_TEXTURE_2D, texObj[0]);
 333    glActiveTextureARB(GL_TEXTURE1_ARB);
 334    glBindTexture(GL_TEXTURE_2D, texObj[1]);
 335 #endif
 336
 337    glShadeModel(GL_FLAT);
 338    glClearColor(0.3, 0.3, 0.4, 1.0);
 339
 340    ModeMenu(TEXBOTH);
 341
 342    if (argc > 1 && strcmp(argv[1], "-info")==0) {
 343       printf("GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
 344       printf("GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
 345       printf("GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
 346       printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
 347    }
 348 }
 349
 350
 351 int main( int argc, char *argv[] )
 352 {
 353    glutInit( &argc, argv );
 354    glutInitWindowSize( 300, 300 );
 355    glutInitWindowPosition( 0, 0 );
 356    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
 357    glutCreateWindow(argv[0] );
 358
 359    Init( argc, argv );
 360
 361    glutReshapeFunc( Reshape );
 362    glutKeyboardFunc( Key );
 363    glutSpecialFunc( SpecialKey );
 364    glutDisplayFunc( Display );
 365    glutIdleFunc( Idle );
 366
 367    glutCreateMenu(ModeMenu);
 368    glutAddMenuEntry("Texture 0", TEX0);
 369    glutAddMenuEntry("Texture 1", TEX1);
 370    glutAddMenuEntry("Multi-texture", TEXBOTH);
 371    glutAddMenuEntry("Toggle Animation", ANIMATE);
 372    glutAddMenuEntry("Quit", QUIT);
 373    glutAttachMenu(GLUT_RIGHT_BUTTON);
 374
 375    glutMainLoop();
 376    return 0;
 377 }