src/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/glew.h>
  17 #include "glut_wrap.h"
  18
  19
  20 static GLint NumTextures = 20;
  21 static GLuint *TextureID = NULL;
  22 static GLint *TextureWidth = NULL, *TextureHeight = NULL;
  23 static GLboolean *TextureResidency = NULL;
  24 static GLint TexWidth = 128, TexHeight = 128;
  25 static GLfloat Zrot = 0;
  26 static GLboolean Anim = GL_TRUE;
  27 static GLint WinWidth = 500, WinHeight = 400;
  28 static GLboolean MipMap = GL_FALSE;
  29 static GLboolean LinearFilter = GL_FALSE;
  30 static GLboolean RandomSize = GL_FALSE;
  31 static GLint Rows, Columns;
  32 static GLint LowPriorityCount = 0;
  33 static GLint Win;
  34
  35
  36 static void Idle( void )
  37 {
  38    Zrot += 1.0;
  39    glutPostRedisplay();
  40 }
  41
  42
  43 static void Display( void )
  44 {
  45    GLfloat spacing = WinWidth / Columns;
  46    GLfloat size = spacing * 0.4;
  47    GLint i;
  48
  49    /* test residency */
  50    if (0)
  51    {
  52       GLboolean b;
  53       GLint i, resident;
  54       b = glAreTexturesResident(NumTextures, TextureID, TextureResidency);
  55       if (b) {
  56          printf("all resident\n");
  57       }
  58       else {
  59          resident = 0;
  60          for (i = 0; i < NumTextures; i++) {
  61             if (TextureResidency[i]) {
  62                resident++;
  63             }
  64          }
  65          printf("%d of %d texture resident\n", resident, NumTextures);
  66       }
  67    }
  68
  69    /* render the textured quads */
  70    glClear( GL_COLOR_BUFFER_BIT );
  71    for (i = 0; i < NumTextures; i++) {
  72       GLint row = i / Columns;
  73       GLint col = i % Columns;
  74       GLfloat x = col * spacing + spacing * 0.5;
  75       GLfloat y = row * spacing + spacing * 0.5;
  76
  77       GLfloat maxDim = (TextureWidth[i] > TextureHeight[i])
  78          ? TextureWidth[i] : TextureHeight[i];
  79       GLfloat w = TextureWidth[i] / maxDim;
  80       GLfloat h = TextureHeight[i] / maxDim;
  81
  82       glPushMatrix();
  83          glTranslatef(x, y, 0.0);
  84          glRotatef(Zrot, 0, 0, 1);
  85          glScalef(size, size, 1);
  86
  87          glBindTexture(GL_TEXTURE_2D, TextureID[i]);
  88          glBegin(GL_POLYGON);
  89 #if 0
  90          glTexCoord2f(0, 0);  glVertex2f(-1, -1);
  91          glTexCoord2f(1, 0);  glVertex2f( 1, -1);
  92          glTexCoord2f(1, 1);  glVertex2f( 1,  1);
  93          glTexCoord2f(0, 1);  glVertex2f(-1,  1);
  94 #else
  95          glTexCoord2f(0, 0);  glVertex2f(-w, -h);
  96          glTexCoord2f(1, 0);  glVertex2f( w, -h);
  97          glTexCoord2f(1, 1);  glVertex2f( w,  h);
  98          glTexCoord2f(0, 1);  glVertex2f(-w,  h);
  99 #endif
 100          glEnd();
 101       glPopMatrix();
 102    }
 103
 104    glutSwapBuffers();
 105 }
 106
 107
 108 static void Reshape( int width, int height )
 109 {
 110    WinWidth = width;
 111    WinHeight = height;
 112    glViewport( 0, 0, width, height );
 113    glMatrixMode( GL_PROJECTION );
 114    glLoadIdentity();
 115    glOrtho(0, width, 0, height, -1, 1);
 116    glMatrixMode( GL_MODELVIEW );
 117    glLoadIdentity();
 118 }
 119
 120
 121 /*
 122  * Return a random int in [min, max].
 123  */
 124 static int RandomInt(int min, int max)
 125 {
 126    int i = rand();
 127    int j = i % (max - min + 1);
 128    return min + j;
 129 }
 130
 131
 132 static void DeleteTextures(void)
 133 {
 134    glDeleteTextures(NumTextures, TextureID);
 135    free(TextureID);
 136    TextureID = NULL;
 137 }
 138
 139
 140
 141 static void Init( void )
 142 {
 143    GLint i;
 144
 145    if (RandomSize) {
 146       printf("Creating %d %s random-size textures, ", NumTextures,
 147              MipMap ? "Mipmapped" : "non-Mipmapped");
 148    }
 149    else {
 150       printf("Creating %d %s %d x %d textures, ", NumTextures,
 151              MipMap ? "Mipmapped" : "non-Mipmapped",
 152              TexWidth, TexHeight);
 153    }
 154
 155    if (LinearFilter) {
 156       printf("bilinear filtering\n");
 157    }
 158    else {
 159       printf("nearest filtering\n");
 160    }
 161
 162
 163    /* compute number of rows and columns of rects */
 164    {
 165       GLfloat area = (GLfloat) (WinWidth * WinHeight) / (GLfloat) NumTextures;
 166       GLfloat edgeLen = sqrt(area);
 167
 168       Columns = WinWidth / edgeLen;
 169       Rows = (NumTextures + Columns - 1) / Columns;
 170       printf("Rows: %d  Cols: %d\n", Rows, Columns);
 171    }
 172
 173
 174    if (!TextureID) {
 175       TextureID = (GLuint *) malloc(sizeof(GLuint) * NumTextures);
 176       assert(TextureID);
 177       glGenTextures(NumTextures, TextureID);
 178    }
 179
 180    if (!TextureResidency) {
 181       TextureResidency = (GLboolean *) malloc(sizeof(GLboolean) * NumTextures);
 182       assert(TextureResidency);
 183    }
 184
 185    if (!TextureWidth) {
 186       TextureWidth = (GLint *) malloc(sizeof(GLint) * NumTextures);
 187       assert(TextureWidth);
 188    }
 189    if (!TextureHeight) {
 190       TextureHeight = (GLint *) malloc(sizeof(GLint) * NumTextures);
 191       assert(TextureHeight);
 192    }
 193
 194    for (i = 0; i < NumTextures; i++) {
 195       GLubyte color[4];
 196       GLubyte *texImage;
 197       GLint j, row, col;
 198
 199       row = i / Columns;
 200       col = i % Columns;
 201
 202       glBindTexture(GL_TEXTURE_2D, TextureID[i]);
 203
 204       if (i < LowPriorityCount)
 205          glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_PRIORITY, 0.5F);
 206
 207       if (RandomSize) {
 208 #if 0
 209          int k = (glutGet(GLUT_ELAPSED_TIME) % 7) + 2;
 210          TexWidth  = 1 << k;
 211          TexHeight = 1 << k;
 212 #else
 213          TexWidth = 1 << RandomInt(2, 7);
 214          TexHeight = 1 << RandomInt(2, 7);
 215          printf("Random size of %3d: %d x %d\n", i, TexWidth, TexHeight);
 216 #endif
 217       }
 218
 219       TextureWidth[i] = TexWidth;
 220       TextureHeight[i] = TexHeight;
 221
 222       texImage = (GLubyte*) malloc(4 * TexWidth * TexHeight * sizeof(GLubyte));
 223       assert(texImage);
 224
 225       /* determine texture color */
 226       color[0] = (GLint) (255.0 * ((float) col / (Columns - 1)));
 227       color[1] = 127;
 228       color[2] = (GLint) (255.0 * ((float) row / (Rows - 1)));
 229       color[3] = 255;
 230
 231       /* fill in solid-colored teximage */
 232       for (j = 0; j < TexWidth * TexHeight; j++) {
 233          texImage[j*4+0] = color[0];
 234          texImage[j*4+1] = color[1];
 235          texImage[j*4+2] = color[2];
 236          texImage[j*4+3] = color[3];
 237      }
 238
 239       if (MipMap) {
 240          GLint level = 0;
 241          GLint w = TexWidth, h = TexHeight;
 242          while (1) {
 243             glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, w, h, 0,
 244                          GL_RGBA, GL_UNSIGNED_BYTE, texImage);
 245             if (w == 1 && h == 1)
 246                break;
 247             if (w > 1)
 248                w /= 2;
 249             if (h > 1)
 250                h /= 2;
 251             level++;
 252             /*printf("%d: %d x %d\n", level, w, h);*/
 253          }
 254          if (LinearFilter) {
 255             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
 256                             GL_LINEAR_MIPMAP_LINEAR);
 257             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 258          }
 259          else {
 260             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
 261                             GL_NEAREST_MIPMAP_NEAREST);
 262             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 263          }
 264       }
 265       else {
 266          /* Set corners to white */
 267          int k = 0;
 268          texImage[k+0] = texImage[k+1] = texImage[k+2] = texImage[k+3] = 255;
 269          k = (TexWidth - 1) * 4;
 270          texImage[k+0] = texImage[k+1] = texImage[k+2] = texImage[k+3] = 255;
 271          k = (TexWidth * TexHeight - TexWidth) * 4;
 272          texImage[k+0] = texImage[k+1] = texImage[k+2] = texImage[k+3] = 255;
 273          k = (TexWidth * TexHeight - 1) * 4;
 274          texImage[k+0] = texImage[k+1] = texImage[k+2] = texImage[k+3] = 255;
 275
 276          glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, TexWidth, TexHeight, 0,
 277                       GL_RGBA, GL_UNSIGNED_BYTE, texImage);
 278          if (LinearFilter) {
 279             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 280             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 281          }
 282          else {
 283             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 284             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 285          }
 286       }
 287
 288       free(texImage);
 289    }
 290
 291    glEnable(GL_TEXTURE_2D);
 292 }
 293
 294
 295 static void Key( unsigned char key, int x, int y )
 296 {
 297    const GLfloat step = 3.0;
 298    (void) x;
 299    (void) y;
 300    switch (key) {
 301       case 'a':
 302          Anim = !Anim;
 303          if (Anim)
 304             glutIdleFunc(Idle);
 305          else
 306             glutIdleFunc(NULL);
 307          break;
 308       case 's':
 309          Idle();
 310          break;
 311       case 'z':
 312          Zrot -= step;
 313          break;
 314       case 'Z':
 315          Zrot += step;
 316          break;
 317       case ' ':
 318          DeleteTextures();
 319          Init();
 320          break;
 321       case 27:
 322          DeleteTextures();
 323          glutDestroyWindow(Win);
 324          exit(0);
 325          break;
 326    }
 327    glutPostRedisplay();
 328 }
 329
 330
 331 int main( int argc, char *argv[] )
 332 {
 333    GLint i;
 334
 335    glutInit( &argc, argv );
 336    glutInitWindowPosition( 0, 0 );
 337    glutInitWindowSize( WinWidth, WinHeight );
 338    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
 339    Win = glutCreateWindow(argv[0]);
 340    glewInit();
 341    glutReshapeFunc( Reshape );
 342    glutKeyboardFunc( Key );
 343    glutDisplayFunc( Display );
 344    if (Anim)
 345       glutIdleFunc(Idle);
 346
 347    for (i = 1; i < argc; i++) {
 348       if (strcmp(argv[i], "-n") == 0) {
 349          NumTextures = atoi(argv[i+1]);
 350          if (NumTextures <= 0) {
 351             printf("Error, bad number of textures\n");
 352             return 1;
 353          }
 354          i++;
 355       }
 356       else if (strcmp(argv[i], "-mipmap") == 0) {
 357          MipMap = GL_TRUE;
 358       }
 359       else if (strcmp(argv[i], "-linear") == 0) {
 360          LinearFilter = GL_TRUE;
 361       }
 362       else if (strcmp(argv[i], "-size") == 0) {
 363          TexWidth = atoi(argv[i+1]);
 364          TexHeight = atoi(argv[i+2]);
 365          assert(TexWidth >= 1);
 366          assert(TexHeight >= 1);
 367          i += 2;
 368       }
 369       else if (strcmp(argv[i], "-randomsize") == 0) {
 370          RandomSize = GL_TRUE;
 371       }
 372       else if (strcmp(argv[i], "-lowpri") == 0) {
 373          LowPriorityCount = atoi(argv[i+1]);
 374          i++;
 375       }
 376       else {
 377          printf("Usage:\n");
 378          printf("  manytex [options]\n");
 379          printf("Options:\n");
 380          printf("  -n <number of texture objects>\n");
 381          printf("  -size <width> <height>  - specify texture size\n");
 382          printf("  -randomsize  - use random size textures\n");
 383          printf("  -mipmap      - generate mipmaps\n");
 384          printf("  -linear      - use linear filtering instead of nearest\n");
 385          printf("  -lowpri <n>  - Set lower priority on <n> textures\n");
 386          return 0;
 387       }
 388    }
 389
 390    Init();
 391
 392    glutMainLoop();
 393
 394    return 0;
 395 }