src/tests/manytex.c

   1 /* $Id: manytex.c,v 1.4 2002/10/18 17:47:36 kschultz Exp $ */
   2
   3 /*
   4  * test handling of many texture maps
   5  * Also tests texture priority and residency.
   6  *
   7  * Brian Paul
   8  * August 2, 2000
   9  */
  10
  11
  12 #include <assert.h>
  13 #include <stdio.h>
  14 #include <stdlib.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
  33
  34 static void Idle( void )
  35 {
  36    Zrot += 1.0;
  37    glutPostRedisplay();
  38 }
  39
  40
  41 static void Display( void )
  42 {
  43    GLfloat spacing = WinWidth / Columns;
  44    GLfloat size = spacing * 0.4;
  45    GLint i;
  46
  47    /* test residency */
  48    if (0)
  49    {
  50       GLboolean b;
  51       GLint i, resident;
  52       b = glAreTexturesResident(NumTextures, TextureID, TextureResidency);
  53       if (b) {
  54          printf("all resident\n");
  55       }
  56       else {
  57          resident = 0;
  58          for (i = 0; i < NumTextures; i++) {
  59             if (TextureResidency[i]) {
  60                resident++;
  61             }
  62          }
  63          printf("%d of %d texture resident\n", resident, NumTextures);
  64       }
  65    }
  66
  67    /* render the textured quads */
  68    glClear( GL_COLOR_BUFFER_BIT );
  69    for (i = 0; i < NumTextures; i++) {
  70       GLint row = i / Columns;
  71       GLint col = i % Columns;
  72       GLfloat x = col * spacing + spacing * 0.5;
  73       GLfloat y = row * spacing + spacing * 0.5;
  74
  75       GLfloat maxDim = (TextureWidth[i] > TextureHeight[i])
  76          ? TextureWidth[i] : TextureHeight[i];
  77       GLfloat w = TextureWidth[i] / maxDim;
  78       GLfloat h = TextureHeight[i] / maxDim;
  79
  80       glPushMatrix();
  81          glTranslatef(x, y, 0.0);
  82          glRotatef(Zrot, 0, 0, 1);
  83          glScalef(size, size, 1);
  84
  85          glBindTexture(GL_TEXTURE_2D, TextureID[i]);
  86          glBegin(GL_POLYGON);
  87 #if 0
  88          glTexCoord2f(0, 0);  glVertex2f(-1, -1);
  89          glTexCoord2f(1, 0);  glVertex2f( 1, -1);
  90          glTexCoord2f(1, 1);  glVertex2f( 1,  1);
  91          glTexCoord2f(0, 1);  glVertex2f(-1,  1);
  92 #else
  93          glTexCoord2f(0, 0);  glVertex2f(-w, -h);
  94          glTexCoord2f(1, 0);  glVertex2f( w, -h);
  95          glTexCoord2f(1, 1);  glVertex2f( w,  h);
  96          glTexCoord2f(0, 1);  glVertex2f(-w,  h);
  97 #endif
  98          glEnd();
  99       glPopMatrix();
 100    }
 101
 102    glutSwapBuffers();
 103 }
 104
 105
 106 static void Reshape( int width, int height )
 107 {
 108    WinWidth = width;
 109    WinHeight = height;
 110    glViewport( 0, 0, width, height );
 111    glMatrixMode( GL_PROJECTION );
 112    glLoadIdentity();
 113    glOrtho(0, width, 0, height, -1, 1);
 114    glMatrixMode( GL_MODELVIEW );
 115    glLoadIdentity();
 116 }
 117
 118
 119 /*
 120  * Return a random int in [min, max].
 121  */
 122 static int RandomInt(int min, int max)
 123 {
 124    int i = rand();
 125    int j = i % (max - min + 1);
 126    return min + j;
 127 }
 128
 129
 130
 131 static void Init( void )
 132 {
 133    GLint i;
 134
 135    if (RandomSize) {
 136       printf("Creating %d %s random-size textures, ", NumTextures,
 137              MipMap ? "Mipmapped" : "non-Mipmapped");
 138    }
 139    else {
 140       printf("Creating %d %s %d x %d textures, ", NumTextures,
 141              MipMap ? "Mipmapped" : "non-Mipmapped",
 142              TexWidth, TexHeight);
 143    }
 144
 145    if (LinearFilter) {
 146       printf("bilinear filtering\n");
 147    }
 148    else {
 149       printf("nearest filtering\n");
 150    }
 151
 152
 153    /* compute number of rows and columns of rects */
 154    {
 155       GLfloat area = (GLfloat) (WinWidth * WinHeight) / (GLfloat) NumTextures;
 156       GLfloat edgeLen = sqrt(area);
 157
 158       Columns = WinWidth / edgeLen;
 159       Rows = (NumTextures + Columns - 1) / Columns;
 160       printf("Rows: %d  Cols: %d\n", Rows, Columns);
 161    }
 162
 163
 164    if (!TextureID) {
 165       TextureID = (GLuint *) malloc(sizeof(GLuint) * NumTextures);
 166       assert(TextureID);
 167       glGenTextures(NumTextures, TextureID);
 168    }
 169
 170    if (!TextureResidency) {
 171       TextureResidency = (GLboolean *) malloc(sizeof(GLboolean) * NumTextures);
 172       assert(TextureResidency);
 173    }
 174
 175    if (!TextureWidth) {
 176       TextureWidth = (GLint *) malloc(sizeof(GLint) * NumTextures);
 177       assert(TextureWidth);
 178    }
 179    if (!TextureHeight) {
 180       TextureHeight = (GLint *) malloc(sizeof(GLint) * NumTextures);
 181       assert(TextureHeight);
 182    }
 183
 184    for (i = 0; i < NumTextures; i++) {
 185       GLubyte color[4];
 186       GLubyte *texImage;
 187       GLint j, row, col;
 188
 189       row = i / Columns;
 190       col = i % Columns;
 191
 192       glBindTexture(GL_TEXTURE_2D, TextureID[i]);
 193
 194       if (i < LowPriorityCount)
 195          glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_PRIORITY, 0.5F);
 196
 197       if (RandomSize) {
 198 #if 0
 199          int k = (glutGet(GLUT_ELAPSED_TIME) % 7) + 2;
 200          TexWidth  = 1 << k;
 201          TexHeight = 1 << k;
 202 #else
 203          TexWidth = 1 << RandomInt(2, 7);
 204          TexHeight = 1 << RandomInt(2, 7);
 205          printf("Random size of %3d: %d x %d\n", i, TexWidth, TexHeight);
 206 #endif
 207       }
 208
 209       TextureWidth[i] = TexWidth;
 210       TextureHeight[i] = TexHeight;
 211
 212       texImage = (GLubyte*) malloc(4 * TexWidth * TexHeight * sizeof(GLubyte));
 213       assert(texImage);
 214
 215       /* determine texture color */
 216       color[0] = (GLint) (255.0 * ((float) col / (Columns - 1)));
 217       color[1] = 127;
 218       color[2] = (GLint) (255.0 * ((float) row / (Rows - 1)));
 219       color[3] = 255;
 220
 221       /* fill in solid-colored teximage */
 222       for (j = 0; j < TexWidth * TexHeight; j++) {
 223          texImage[j*4+0] = color[0];
 224          texImage[j*4+1] = color[1];
 225          texImage[j*4+2] = color[2];
 226          texImage[j*4+3] = color[3];
 227      }
 228
 229       if (MipMap) {
 230          GLint level = 0;
 231          GLint w = TexWidth, h = TexHeight;
 232          while (1) {
 233             glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, w, h, 0,
 234                          GL_RGBA, GL_UNSIGNED_BYTE, texImage);
 235             if (w == 1 && h == 1)
 236                break;
 237             if (w > 1)
 238                w /= 2;
 239             if (h > 1)
 240                h /= 2;
 241             level++;
 242             /*printf("%d: %d x %d\n", level, w, h);*/
 243          }
 244          if (LinearFilter) {
 245             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
 246                             GL_LINEAR_MIPMAP_LINEAR);
 247             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 248          }
 249          else {
 250             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
 251                             GL_NEAREST_MIPMAP_NEAREST);
 252             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 253          }
 254       }
 255       else {
 256          /* Set corners to white */
 257          int k = 0;
 258          texImage[k+0] = texImage[k+1] = texImage[k+2] = texImage[k+3] = 255;
 259          k = (TexWidth - 1) * 4;
 260          texImage[k+0] = texImage[k+1] = texImage[k+2] = texImage[k+3] = 255;
 261          k = (TexWidth * TexHeight - TexWidth) * 4;
 262          texImage[k+0] = texImage[k+1] = texImage[k+2] = texImage[k+3] = 255;
 263          k = (TexWidth * TexHeight - 1) * 4;
 264          texImage[k+0] = texImage[k+1] = texImage[k+2] = texImage[k+3] = 255;
 265
 266          glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, TexWidth, TexHeight, 0,
 267                       GL_RGBA, GL_UNSIGNED_BYTE, texImage);
 268          if (LinearFilter) {
 269             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 270             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 271          }
 272          else {
 273             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 274             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 275          }
 276       }
 277
 278       free(texImage);
 279    }
 280
 281    glEnable(GL_TEXTURE_2D);
 282 }
 283
 284
 285 static void Key( unsigned char key, int x, int y )
 286 {
 287    const GLfloat step = 3.0;
 288    (void) x;
 289    (void) y;
 290    switch (key) {
 291       case 'a':
 292          Anim = !Anim;
 293          if (Anim)
 294             glutIdleFunc(Idle);
 295          else
 296             glutIdleFunc(NULL);
 297          break;
 298       case 's':
 299          Idle();
 300          break;
 301       case 'z':
 302          Zrot -= step;
 303          break;
 304       case 'Z':
 305          Zrot += step;
 306          break;
 307       case ' ':
 308          Init();
 309          break;
 310       case 27:
 311          exit(0);
 312          break;
 313    }
 314    glutPostRedisplay();
 315 }
 316
 317
 318 int main( int argc, char *argv[] )
 319 {
 320    GLint i;
 321
 322    glutInit( &argc, argv );
 323    glutInitWindowPosition( 0, 0 );
 324    glutInitWindowSize( WinWidth, WinHeight );
 325    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
 326    glutCreateWindow(argv[0]);
 327    glutReshapeFunc( Reshape );
 328    glutKeyboardFunc( Key );
 329    glutDisplayFunc( Display );
 330    if (Anim)
 331       glutIdleFunc(Idle);
 332
 333    for (i = 1; i < argc; i++) {
 334       if (strcmp(argv[i], "-n") == 0) {
 335          NumTextures = atoi(argv[i+1]);
 336          if (NumTextures <= 0) {
 337             printf("Error, bad number of textures\n");
 338             return 1;
 339          }
 340          i++;
 341       }
 342       else if (strcmp(argv[i], "-mipmap") == 0) {
 343          MipMap = GL_TRUE;
 344       }
 345       else if (strcmp(argv[i], "-linear") == 0) {
 346          LinearFilter = GL_TRUE;
 347       }
 348       else if (strcmp(argv[i], "-size") == 0) {
 349          TexWidth = atoi(argv[i+1]);
 350          TexHeight = atoi(argv[i+2]);
 351          assert(TexWidth >= 1);
 352          assert(TexHeight >= 1);
 353          i += 2;
 354       }
 355       else if (strcmp(argv[i], "-randomsize") == 0) {
 356          RandomSize = GL_TRUE;
 357       }
 358       else if (strcmp(argv[i], "-lowpri") == 0) {
 359          LowPriorityCount = atoi(argv[i+1]);
 360          i++;
 361       }
 362       else {
 363          printf("Usage:\n");
 364          printf("  manytex [options]\n");
 365          printf("Options:\n");
 366          printf("  -n <number of texture objects>\n");
 367          printf("  -size <width> <height>  - specify texture size\n");
 368          printf("  -randomsize  - use random size textures\n");
 369          printf("  -mipmap      - generate mipmaps\n");
 370          printf("  -linear      - use linear filtering instead of nearest\n");
 371          printf("  -lowpri <n>  - Set lower priority on <n> textures\n");
 372          return 0;
 373       }
 374    }
 375
 376    Init();
 377
 378    glutMainLoop();
 379
 380    return 0;
 381 }