progs/tests/multipal.c

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