progs/tests/texrect.c

   1
   2 /* GL_NV_texture_rectangle test
   3  *
   4  * Brian Paul
   5  * 14 June 2002
   6  */
   7
   8
   9 #define GL_GLEXT_PROTOTYPES
  10 #include <math.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <GL/glut.h>
  15 #include "readtex.h"
  16
  17 #define TEXTURE_0_FILE "../images/girl.rgb"
  18 #define TEXTURE_1_FILE "../images/reflect.rgb"
  19
  20 #define TEX0 1
  21 #define TEX7 8
  22 #define ANIMATE 10
  23 #define CLAMP 20
  24 #define CLAMP_TO_EDGE 21
  25 #define CLAMP_TO_BORDER 22
  26 #define LINEAR_FILTER 30
  27 #define NEAREST_FILTER 31
  28 #define QUIT 100
  29
  30 static GLboolean Animate = GL_FALSE;
  31 static GLint NumUnits = 2;
  32 static GLboolean TexEnabled[8];
  33 static GLint Width[8], Height[8];  /* image sizes */
  34 static GLenum Format[8];
  35
  36 static GLfloat Xrot = 00.0, Yrot = 00.0, Zrot = 0.0;
  37
  38
  39 static void Idle( void )
  40 {
  41    Zrot = glutGet(GLUT_ELAPSED_TIME) * 0.01;
  42    glutPostRedisplay();
  43 }
  44
  45
  46 static void DrawObject(void)
  47 {
  48    GLint i;
  49    GLfloat d = 10;  /* so we can see how borders are handled */
  50
  51    glColor3f(.1, .1, .1);  /* modulate this */
  52
  53    glPushMatrix();
  54
  55       glRotatef(Zrot, 0, 0, 1);
  56
  57       glBegin(GL_QUADS);
  58
  59       for (i = 0; i < NumUnits; i++)
  60          glMultiTexCoord2fARB(GL_TEXTURE0_ARB + i, -d, -d);
  61       glVertex2f(-1.0, -1.0);
  62
  63       for (i = 0; i < NumUnits; i++)
  64          glMultiTexCoord2fARB(GL_TEXTURE0_ARB + i, Width[i]+d, -d);
  65       glVertex2f(1.0, -1.0);
  66
  67       for (i = 0; i < NumUnits; i++)
  68          glMultiTexCoord2fARB(GL_TEXTURE0_ARB + i, Width[i]+d, Height[i]+d);
  69       glVertex2f(1.0, 1.0);
  70
  71       for (i = 0; i < NumUnits; i++)
  72          glMultiTexCoord2fARB(GL_TEXTURE0_ARB + i, -d, Height[i]+d);
  73       glVertex2f(-1.0, 1.0);
  74
  75       glEnd();
  76    glPopMatrix();
  77 }
  78
  79
  80 static void Display( void )
  81 {
  82    glClear( GL_COLOR_BUFFER_BIT );
  83
  84    glPushMatrix();
  85       glRotatef(Xrot, 1.0, 0.0, 0.0);
  86       glRotatef(Yrot, 0.0, 1.0, 0.0);
  87       glRotatef(Zrot, 0.0, 0.0, 1.0);
  88       glScalef(5.0, 5.0, 5.0);
  89       DrawObject();
  90    glPopMatrix();
  91
  92    glutSwapBuffers();
  93 }
  94
  95
  96 static void Reshape( int width, int height )
  97 {
  98    glViewport( 0, 0, width, height );
  99    glMatrixMode( GL_PROJECTION );
 100    glLoadIdentity();
 101    glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 100.0 );
 102    glMatrixMode( GL_MODELVIEW );
 103    glLoadIdentity();
 104    glTranslatef( 0.0, 0.0, -35.0 );
 105 }
 106
 107
 108 static void ModeMenu(int entry)
 109 {
 110    GLint i;
 111    if (entry >= TEX0 && entry < TEX0 + NumUnits) {
 112       /* toggle */
 113       i = entry - TEX0;
 114       TexEnabled[i] = !TexEnabled[i];
 115       glActiveTextureARB(GL_TEXTURE0_ARB + i);
 116       if (TexEnabled[i]) {
 117          glEnable(GL_TEXTURE_RECTANGLE_NV);
 118       }
 119       else {
 120          glDisable(GL_TEXTURE_RECTANGLE_NV);
 121       }
 122       printf("Enabled: ");
 123       for (i = 0; i < NumUnits; i++)
 124          printf("%d ", (int) TexEnabled[i]);
 125       printf("\n");
 126    }
 127    else if (entry==ANIMATE) {
 128       Animate = !Animate;
 129       if (Animate)
 130          glutIdleFunc(Idle);
 131       else
 132          glutIdleFunc(NULL);
 133    }
 134    else if (entry==CLAMP) {
 135       for (i = 0; i < NumUnits; i++) {
 136          glActiveTextureARB(GL_TEXTURE0_ARB + i);
 137          glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_WRAP_S, GL_CLAMP);
 138          glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_WRAP_T, GL_CLAMP);
 139       }
 140    }
 141    else if (entry==CLAMP_TO_EDGE) {
 142       for (i = 0; i < NumUnits; i++) {
 143          glActiveTextureARB(GL_TEXTURE0_ARB + i);
 144          glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 145          glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 146       }
 147    }
 148    else if (entry==CLAMP_TO_BORDER) {
 149       for (i = 0; i < NumUnits; i++) {
 150          glActiveTextureARB(GL_TEXTURE0_ARB + i);
 151          glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
 152          glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
 153       }
 154    }
 155    else if (entry==NEAREST_FILTER) {
 156       for (i = 0; i < NumUnits; i++) {
 157          glActiveTextureARB(GL_TEXTURE0_ARB + i);
 158          glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 159          glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 160       }
 161    }
 162    else if (entry==LINEAR_FILTER) {
 163       for (i = 0; i < NumUnits; i++) {
 164          glActiveTextureARB(GL_TEXTURE0_ARB + i);
 165          glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 166          glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 167       }
 168    }
 169
 170    else if (entry==QUIT) {
 171       exit(0);
 172    }
 173
 174    glutPostRedisplay();
 175 }
 176
 177
 178 static void Key( unsigned char key, int x, int y )
 179 {
 180    (void) x;
 181    (void) y;
 182    switch (key) {
 183       case 'z':
 184          Zrot -= 1.0;
 185          break;
 186       case 'Z':
 187          Zrot += 1.0;
 188          break;
 189       case 'a':
 190          Animate = !Animate;
 191          if (Animate)
 192             glutIdleFunc(Idle);
 193          else
 194             glutIdleFunc(NULL);
 195          break;
 196       case 27:
 197          exit(0);
 198          break;
 199    }
 200    glutPostRedisplay();
 201 }
 202
 203
 204 static void SpecialKey( int key, int x, int y )
 205 {
 206    float step = 3.0;
 207    (void) x;
 208    (void) y;
 209
 210    switch (key) {
 211       case GLUT_KEY_UP:
 212          Xrot += step;
 213          break;
 214       case GLUT_KEY_DOWN:
 215          Xrot -= step;
 216          break;
 217       case GLUT_KEY_LEFT:
 218          Yrot += step;
 219          break;
 220       case GLUT_KEY_RIGHT:
 221          Yrot -= step;
 222          break;
 223    }
 224    glutPostRedisplay();
 225 }
 226
 227
 228 static void Init( int argc, char *argv[] )
 229 {
 230    const GLenum wrap = GL_CLAMP;
 231    GLuint texObj[8];
 232    GLint size, i;
 233
 234    if (!glutExtensionSupported("GL_ARB_multitexture")) {
 235       printf("Sorry, GL_ARB_multitexture needed by this program\n");
 236       exit(1);
 237    }
 238
 239    if (!glutExtensionSupported("GL_NV_texture_rectangle")) {
 240       printf("Sorry, GL_NV_texture_rectangle needed by this program\n");
 241       exit(1);
 242    }
 243
 244    glGetIntegerv(GL_MAX_TEXTURE_UNITS_ARB, &NumUnits);
 245    printf("%d texture units supported, using 2.\n", NumUnits);
 246    if (NumUnits > 2)
 247       NumUnits = 2;
 248
 249    glGetIntegerv(GL_MAX_RECTANGLE_TEXTURE_SIZE_NV, &size);
 250    printf("%d x %d max texture rectangle size\n", size, size);
 251
 252    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 253
 254    for (i = 0; i < NumUnits; i++) {
 255       TexEnabled[i] = GL_TRUE;
 256    }
 257
 258    /* allocate two texture objects */
 259    glGenTextures(NumUnits, texObj);
 260
 261    /* setup the texture objects */
 262    for (i = 0; i < NumUnits; i++) {
 263
 264       glActiveTextureARB(GL_TEXTURE0_ARB + i);
 265
 266       glBindTexture(GL_TEXTURE_RECTANGLE_NV, texObj[i]);
 267       glTexParameteri(GL_TEXTURE_RECTANGLE_NV,
 268                       GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 269       glTexParameteri(GL_TEXTURE_RECTANGLE_NV,
 270                       GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 271       glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_WRAP_S, wrap);
 272       glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_WRAP_T, wrap);
 273
 274       if (i == 0) {
 275          GLubyte *img = LoadRGBImage(TEXTURE_0_FILE, &Width[0], &Height[0],
 276                                      &Format[0]);
 277          if (!img) {
 278             printf("Error: couldn't load texture image\n");
 279             exit(1);
 280          }
 281          printf("Texture %d:  %s (%d x %d)\n", i,
 282                 TEXTURE_0_FILE, Width[0], Height[0]);
 283          glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, GL_RGB,
 284                       Width[0], Height[0], 0,
 285                       Format[0], GL_UNSIGNED_BYTE, img);
 286       }
 287       else {
 288          GLubyte *img = LoadRGBImage(TEXTURE_1_FILE, &Width[1], &Height[1],
 289                                      &Format[1]);
 290          if (!img) {
 291             printf("Error: couldn't load texture image\n");
 292             exit(1);
 293          }
 294          printf("Texture %d:  %s (%d x %d)\n", i,
 295                 TEXTURE_1_FILE, Width[1], Height[1]);
 296          glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, GL_RGB,
 297                       Width[1], Height[1], 0,
 298                       Format[1], GL_UNSIGNED_BYTE, img);
 299       }
 300
 301       if (i < 1)
 302          glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_ADD);
 303       else
 304          glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_ADD);
 305
 306       if (TexEnabled[i])
 307          glEnable(GL_TEXTURE_RECTANGLE_NV);
 308    }
 309
 310    glShadeModel(GL_FLAT);
 311    glClearColor(0.3, 0.3, 0.4, 1.0);
 312
 313    if (argc > 1 && strcmp(argv[1], "-info")==0) {
 314       printf("GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
 315       printf("GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
 316       printf("GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
 317       printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
 318    }
 319 }
 320
 321
 322 int main( int argc, char *argv[] )
 323 {
 324    GLint i;
 325
 326    glutInit( &argc, argv );
 327    glutInitWindowSize( 300, 300 );
 328    glutInitWindowPosition( 0, 0 );
 329    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
 330    glutCreateWindow(argv[0] );
 331
 332    Init( argc, argv );
 333
 334    glutReshapeFunc( Reshape );
 335    glutKeyboardFunc( Key );
 336    glutSpecialFunc( SpecialKey );
 337    glutDisplayFunc( Display );
 338    if (Animate)
 339       glutIdleFunc( Idle );
 340
 341    glutCreateMenu(ModeMenu);
 342
 343    for (i = 0; i < NumUnits; i++) {
 344       char s[100];
 345       sprintf(s, "Toggle Texture %d", i);
 346       glutAddMenuEntry(s, TEX0 + i);
 347    }
 348    glutAddMenuEntry("Toggle Animation", ANIMATE);
 349    glutAddMenuEntry("GL_CLAMP", CLAMP);
 350    glutAddMenuEntry("GL_CLAMP_TO_EDGE", CLAMP_TO_EDGE);
 351    glutAddMenuEntry("GL_CLAMP_TO_BORDER", CLAMP_TO_BORDER);
 352    glutAddMenuEntry("GL_NEAREST", NEAREST_FILTER);
 353    glutAddMenuEntry("GL_LINEAR", LINEAR_FILTER);
 354    glutAddMenuEntry("Quit", QUIT);
 355    glutAttachMenu(GLUT_RIGHT_BUTTON);
 356
 357    glutMainLoop();
 358    return 0;
 359 }