progs/tests/manytex.c

   1
   2 /*
   3  * test handling of many texture maps
   4  * Also tests texture priority and residency.
   5  *
   6  * Brian Paul
   7  * August 2, 2000
   8  */
   9
  10
  11 #include <assert.h>
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <math.h>
  16 #include <GL/glut.h>
  17
  18
  19 static GLint NumTextures = 20;
  20 static GLuint *TextureID = NULL;
  21 static GLint *TextureWidth = NULL, *TextureHeight = NULL;
  22 static GLboolean *TextureResidency = NULL;
  23 static GLint TexWidth = 128, TexHeight = 128;
  24 static GLfloat Zrot = 0;
  25 static GLboolean Anim = GL_TRUE;
  26 static GLint WinWidth = 500, WinHeight = 400;
  27 static GLboolean MipMap = GL_FALSE;
  28 static GLboolean LinearFilter = GL_FALSE;
  29 static GLboolean RandomSize = GL_FALSE;
  30 static GLint Rows, Columns;
  31 static GLint LowPriorityCount = 0;
  32 static GLint Win;
  33
  34
  35 static void Idle( void )
  36 {
  37    Zrot += 1.0;
  38    glutPostRedisplay();
  39 }
  40
  41
  42 static void Display( void )
  43 {
  44    GLfloat spacing = WinWidth / Columns;
  45    GLfloat size = spacing * 0.4;
  46    GLint i;
  47
  48    /* test residency */
  49    if (0)
  50    {
  51       GLboolean b;
  52       GLint i, resident;
  53       b = glAreTexturesResident(NumTextures, TextureID, TextureResidency);
  54       if (b) {
  55          printf("all resident\n");
  56       }
  57       else {
  58          resident = 0;
  59          for (i = 0; i < NumTextures; i++) {
  60             if (TextureResidency[i]) {
  61                resident++;
  62             }
  63          }
  64          printf("%d of %d texture resident\n", resident, NumTextures);
  65       }
  66    }
  67
  68    /* render the textured quads */
  69    glClear( GL_COLOR_BUFFER_BIT );
  70    for (i = 0; i < NumTextures; i++) {
  71       GLint row = i / Columns;
  72       GLint col = i % Columns;
  73       GLfloat x = col * spacing + spacing * 0.5;
  74       GLfloat y = row * spacing + spacing * 0.5;
  75
  76       GLfloat maxDim = (TextureWidth[i] > TextureHeight[i])
  77          ? TextureWidth[i] : TextureHeight[i];
  78       GLfloat w = TextureWidth[i] / maxDim;
  79       GLfloat h = TextureHeight[i] / maxDim;
  80
  81       glPushMatrix();
  82          glTranslatef(x, y, 0.0);
  83          glRotatef(Zrot, 0, 0, 1);
  84          glScalef(size, size, 1);
  85
  86          glBindTexture(GL_TEXTURE_2D, TextureID[i]);
  87          glBegin(GL_POLYGON);
  88 #if 0
  89          glTexCoord2f(0, 0);  glVertex2f(-1, -1);
  90          glTexCoord2f(1, 0);  glVertex2f( 1, -1);
  91          glTexCoord2f(1, 1);  glVertex2f( 1,  1);
  92          glTexCoord2f(0, 1);  glVertex2f(-1,  1);
  93 #else
  94          glTexCoord2f(0, 0);  glVertex2f(-w, -h);
  95          glTexCoord2f(1, 0);  glVertex2f( w, -h);
  96          glTexCoord2f(1, 1);  glVertex2f( w,  h);
  97          glTexCoord2f(0, 1);  glVertex2f(-w,  h);
  98 #endif
  99          glEnd();
 100       glPopMatrix();
 101    }
 102
 103    glutSwapBuffers();
 104 }
 105
 106
 107 static void Reshape( int width, int height )
 108 {
 109    WinWidth = width;
 110    WinHeight = height;
 111    glViewport( 0, 0, width, height );
 112    glMatrixMode( GL_PROJECTION );
 113    glLoadIdentity();
 114    glOrtho(0, width, 0, height, -1, 1);
 115    glMatrixMode( GL_MODELVIEW );
 116    glLoadIdentity();
 117 }
 118
 119
 120 /*
 121  * Return a random int in [min, max].
 122  */
 123 static int RandomInt(int min, int max)
 124 {
 125    int i = rand();
 126    int j = i % (max - min + 1);
 127    return min + j;
 128 }
 129
 130
 131 static void DeleteTextures(void)
 132 {
 133    glDeleteTextures(NumTextures, TextureID);
 134    free(TextureID);
 135    TextureID = NULL;
 136 }
 137
 138
 139
 140 static void Init( void )
 141 {
 142    GLint i;
 143
 144    if (RandomSize) {
 145       printf("Creating %d %s random-size textures, ", NumTextures,
 146              MipMap ? "Mipmapped" : "non-Mipmapped");
 147    }
 148    else {
 149       printf("Creating %d %s %d x %d textures, ", NumTextures,
 150              MipMap ? "Mipmapped" : "non-Mipmapped",
 151              TexWidth, TexHeight);
 152    }
 153
 154    if (LinearFilter) {
 155       printf("bilinear filtering\n");
 156    }
 157    else {
 158       printf("nearest filtering\n");
 159    }
 160
 161
 162    /* compute number of rows and columns of rects */
 163    {
 164       GLfloat area = (GLfloat) (WinWidth * WinHeight) / (GLfloat) NumTextures;
 165       GLfloat edgeLen = sqrt(area);
 166
 167       Columns = WinWidth / edgeLen;
 168       Rows = (NumTextures + Columns - 1) / Columns;
 169       printf("Rows: %d  Cols: %d\n", Rows, Columns);
 170    }
 171
 172
 173    if (!TextureID) {
 174       TextureID = (GLuint *) malloc(sizeof(GLuint) * NumTextures);
 175       assert(TextureID);
 176       glGenTextures(NumTextures, TextureID);
 177    }
 178
 179    if (!TextureResidency) {
 180       TextureResidency = (GLboolean *) malloc(sizeof(GLboolean) * NumTextures);
 181       assert(TextureResidency);
 182    }
 183
 184    if (!TextureWidth) {
 185       TextureWidth = (GLint *) malloc(sizeof(GLint) * NumTextures);
 186       assert(TextureWidth);
 187    }
 188    if (!TextureHeight) {
 189       TextureHeight = (GLint *) malloc(sizeof(GLint) * NumTextures);
 190       assert(TextureHeight);
 191    }
 192
 193    for (i = 0; i < NumTextures; i++) {
 194       GLubyte color[4];
 195       GLubyte *texImage;
 196       GLint j, row, col;
 197
 198       row = i / Columns;
 199       col = i % Columns;
 200
 201       glBindTexture(GL_TEXTURE_2D, TextureID[i]);
 202
 203       if (i < LowPriorityCount)
 204          glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_PRIORITY, 0.5F);
 205
 206       if (RandomSize) {
 207 #if 0
 208          int k = (glutGet(GLUT_ELAPSED_TIME) % 7) + 2;
 209          TexWidth  = 1 << k;
 210          TexHeight = 1 << k;
 211 #else
 212          TexWidth = 1 << RandomInt(2, 7);
 213          TexHeight = 1 << RandomInt(2, 7);
 214          printf("Random size of %3d: %d x %d\n", i, TexWidth, TexHeight);
 215 #endif
 216       }
 217
 218       TextureWidth[i] = TexWidth;
 219       TextureHeight[i] = TexHeight;
 220
 221       texImage = (GLubyte*) malloc(4 * TexWidth * TexHeight * sizeof(GLubyte));
 222       assert(texImage);
 223
 224       /* determine texture color */
 225       color[0] = (GLint) (255.0 * ((float) col / (Columns - 1)));
 226       color[1] = 127;
 227       color[2] = (GLint) (255.0 * ((float) row / (Rows - 1)));
 228       color[3] = 255;
 229
 230       /* fill in solid-colored teximage */
 231       for (j = 0; j < TexWidth * TexHeight; j++) {
 232          texImage[j*4+0] = color[0];
 233          texImage[j*4+1] = color[1];
 234          texImage[j*4+2] = color[2];
 235          texImage[j*4+3] = color[3];
 236      }
 237
 238       if (MipMap) {
 239          GLint level = 0;
 240          GLint w = TexWidth, h = TexHeight;
 241          while (1) {
 242             glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, w, h, 0,
 243                          GL_RGBA, GL_UNSIGNED_BYTE, texImage);
 244             if (w == 1 && h == 1)
 245                break;
 246             if (w > 1)
 247                w /= 2;
 248             if (h > 1)
 249                h /= 2;
 250             level++;
 251             /*printf("%d: %d x %d\n", level, w, h);*/
 252          }
 253          if (LinearFilter) {
 254             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
 255                             GL_LINEAR_MIPMAP_LINEAR);
 256             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 257          }
 258          else {
 259             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
 260                             GL_NEAREST_MIPMAP_NEAREST);
 261             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 262          }
 263       }
 264       else {
 265          /* Set corners to white */
 266          int k = 0;
 267          texImage[k+0] = texImage[k+1] = texImage[k+2] = texImage[k+3] = 255;
 268          k = (TexWidth - 1) * 4;
 269          texImage[k+0] = texImage[k+1] = texImage[k+2] = texImage[k+3] = 255;
 270          k = (TexWidth * TexHeight - TexWidth) * 4;
 271          texImage[k+0] = texImage[k+1] = texImage[k+2] = texImage[k+3] = 255;
 272          k = (TexWidth * TexHeight - 1) * 4;
 273          texImage[k+0] = texImage[k+1] = texImage[k+2] = texImage[k+3] = 255;
 274
 275          glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, TexWidth, TexHeight, 0,
 276                       GL_RGBA, GL_UNSIGNED_BYTE, texImage);
 277          if (LinearFilter) {
 278             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 279             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 280          }
 281          else {
 282             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 283             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 284          }
 285       }
 286
 287       free(texImage);
 288    }
 289
 290    glEnable(GL_TEXTURE_2D);
 291 }
 292
 293
 294 static void Key( unsigned char key, int x, int y )
 295 {
 296    const GLfloat step = 3.0;
 297    (void) x;
 298    (void) y;
 299    switch (key) {
 300       case 'a':
 301          Anim = !Anim;
 302          if (Anim)
 303             glutIdleFunc(Idle);
 304          else
 305             glutIdleFunc(NULL);
 306          break;
 307       case 's':
 308          Idle();
 309          break;
 310       case 'z':
 311          Zrot -= step;
 312          break;
 313       case 'Z':
 314          Zrot += step;
 315          break;
 316       case ' ':
 317          DeleteTextures();
 318          Init();
 319          break;
 320       case 27:
 321          DeleteTextures();
 322          glutDestroyWindow(Win);
 323          exit(0);
 324          break;
 325    }
 326    glutPostRedisplay();
 327 }
 328
 329
 330 int main( int argc, char *argv[] )
 331 {
 332    GLint i;
 333
 334    glutInit( &argc, argv );
 335    glutInitWindowPosition( 0, 0 );
 336    glutInitWindowSize( WinWidth, WinHeight );
 337    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
 338    Win = glutCreateWindow(argv[0]);
 339    glutReshapeFunc( Reshape );
 340    glutKeyboardFunc( Key );
 341    glutDisplayFunc( Display );
 342    if (Anim)
 343       glutIdleFunc(Idle);
 344
 345    for (i = 1; i < argc; i++) {
 346       if (strcmp(argv[i], "-n") == 0) {
 347          NumTextures = atoi(argv[i+1]);
 348          if (NumTextures <= 0) {
 349             printf("Error, bad number of textures\n");
 350             return 1;
 351          }
 352          i++;
 353       }
 354       else if (strcmp(argv[i], "-mipmap") == 0) {
 355          MipMap = GL_TRUE;
 356       }
 357       else if (strcmp(argv[i], "-linear") == 0) {
 358          LinearFilter = GL_TRUE;
 359       }
 360       else if (strcmp(argv[i], "-size") == 0) {
 361          TexWidth = atoi(argv[i+1]);
 362          TexHeight = atoi(argv[i+2]);
 363          assert(TexWidth >= 1);
 364          assert(TexHeight >= 1);
 365          i += 2;
 366       }
 367       else if (strcmp(argv[i], "-randomsize") == 0) {
 368          RandomSize = GL_TRUE;
 369       }
 370       else if (strcmp(argv[i], "-lowpri") == 0) {
 371          LowPriorityCount = atoi(argv[i+1]);
 372          i++;
 373       }
 374       else {
 375          printf("Usage:\n");
 376          printf("  manytex [options]\n");
 377          printf("Options:\n");
 378          printf("  -n <number of texture objects>\n");
 379          printf("  -size <width> <height>  - specify texture size\n");
 380          printf("  -randomsize  - use random size textures\n");
 381          printf("  -mipmap      - generate mipmaps\n");
 382          printf("  -linear      - use linear filtering instead of nearest\n");
 383          printf("  -lowpri <n>  - Set lower priority on <n> textures\n");
 384          return 0;
 385       }
 386    }
 387
 388    Init();
 389
 390    glutMainLoop();
 391
 392    return 0;
 393 }