progs/tests/arbnpot.c

   1 /*
   2  * Test NPOT textures with the GL_ARB_texture_non_power_of_two extension.
   3  * Brian Paul
   4  * 2 July 2003
   5  */
   6
   7 #include <assert.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <math.h>
  11 #include <GL/glut.h>
  12 #include "../util/readtex.c"
  13
  14 #define IMAGE_FILE "../images/girl.rgb"
  15
  16 static GLfloat Zrot = 0;
  17
  18 static void Display( void )
  19 {
  20    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
  21
  22    glPushMatrix();
  23    glRotatef(Zrot, 0, 0, 1);
  24    glBegin(GL_POLYGON);
  25    glTexCoord2f(0, 0);
  26    glVertex2f(-1, -1);
  27    glTexCoord2f(1, 0);
  28    glVertex2f(1, -1);
  29    glTexCoord2f(1, 1);
  30    glVertex2f(1, 1);
  31    glTexCoord2f(0, 1);
  32    glVertex2f(-1, 1);
  33    glEnd();
  34    glPopMatrix();
  35
  36    glutSwapBuffers();
  37 }
  38
  39
  40 static void Reshape( int width, int height )
  41 {
  42    glViewport( 0, 0, width, height );
  43    glMatrixMode( GL_PROJECTION );
  44    glLoadIdentity();
  45    glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 );
  46    glMatrixMode( GL_MODELVIEW );
  47    glLoadIdentity();
  48    glTranslatef( 0.0, 0.0, -7.0 );
  49 }
  50
  51
  52 static void Key( unsigned char key, int x, int y )
  53 {
  54    (void) x;
  55    (void) y;
  56    switch (key) {
  57       case 'z':
  58          Zrot -= 1.0;
  59          break;
  60       case 'Z':
  61          Zrot += 1.0;
  62          break;
  63       case 27:
  64          exit(0);
  65          break;
  66    }
  67    glutPostRedisplay();
  68 }
  69
  70
  71 static void Init( void )
  72 {
  73    GLubyte *image;
  74    int imgWidth, imgHeight, minDim, w;
  75    GLenum imgFormat;
  76
  77    if (!glutExtensionSupported("GL_ARB_texture_non_power_of_two")) {
  78       printf("Sorry, this program requires GL_ARB_texture_non_power_of_two\n");
  79       exit(1);
  80    }
  81
  82 #if 1
  83    image = LoadRGBImage( IMAGE_FILE, &imgWidth, &imgHeight, &imgFormat );
  84    if (!image) {
  85       printf("Couldn't read %s\n", IMAGE_FILE);
  86       exit(0);
  87    }
  88 #else
  89    int i, j;
  90    imgFormat = GL_RGB;
  91    imgWidth = 3;
  92    imgHeight = 3;
  93    image = malloc(imgWidth * imgHeight * 3);
  94    for (i = 0; i < imgHeight; i++) {
  95       for (j = 0; j < imgWidth; j++) {
  96          int k = (i * imgWidth + j) * 3;
  97          if ((i + j) & 1) {
  98             image[k+0] = 255;
  99             image[k+1] = 0;
 100             image[k+2] = 0;
 101          }
 102          else {
 103             image[k+0] = 0;
 104             image[k+1] = 255;
 105             image[k+2] = 0;
 106          }
 107       }
 108    }
 109 #endif
 110
 111    printf("Read %d x %d\n", imgWidth, imgHeight);
 112
 113    minDim = imgWidth < imgHeight ? imgWidth : imgHeight;
 114
 115    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 116
 117    /*
 118     * 1D Texture.  Test proxy first, if that works, test non-proxy target.
 119     */
 120    glTexImage1D(GL_PROXY_TEXTURE_1D, 0, GL_RGB, imgWidth, 0,
 121                 imgFormat, GL_UNSIGNED_BYTE, image);
 122    glGetTexLevelParameteriv(GL_PROXY_TEXTURE_1D, 0, GL_TEXTURE_WIDTH, &w);
 123    assert(w == imgWidth || w == 0);
 124
 125    if (w) {
 126       glTexImage1D(GL_TEXTURE_1D, 0, GL_RGB, imgWidth, 0,
 127                    imgFormat, GL_UNSIGNED_BYTE, image);
 128       assert(glGetError() == GL_NO_ERROR);
 129    }
 130
 131
 132    /*
 133     * 2D Texture
 134     */
 135    glTexImage2D(GL_PROXY_TEXTURE_2D, 0, GL_RGB, imgWidth, imgHeight, 0,
 136                 imgFormat, GL_UNSIGNED_BYTE, image);
 137    glGetTexLevelParameteriv(GL_PROXY_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &w);
 138    assert(w == imgWidth || w == 0);
 139
 140    if (w) {
 141       glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, imgWidth, imgHeight, 0,
 142                    imgFormat, GL_UNSIGNED_BYTE, image);
 143       assert(glGetError() == GL_NO_ERROR);
 144    }
 145
 146
 147    /*
 148     * 3D Texture
 149     */
 150    glTexImage3D(GL_PROXY_TEXTURE_3D, 0, GL_RGB, imgWidth, imgHeight, 1, 0,
 151                 imgFormat, GL_UNSIGNED_BYTE, image);
 152    glGetTexLevelParameteriv(GL_PROXY_TEXTURE_3D, 0, GL_TEXTURE_WIDTH, &w);
 153    assert(w == imgWidth || w == 0);
 154
 155    if (w) {
 156       glTexImage3D(GL_TEXTURE_3D, 0, GL_RGB, imgWidth, imgHeight, 1, 0,
 157                    imgFormat, GL_UNSIGNED_BYTE, image);
 158       assert(glGetError() == GL_NO_ERROR);
 159    }
 160
 161
 162    /*
 163     * Cube Texture
 164     */
 165    glTexImage2D(GL_PROXY_TEXTURE_CUBE_MAP, 0, GL_RGB,
 166                 minDim, minDim, 0,
 167                 imgFormat, GL_UNSIGNED_BYTE, image);
 168    glGetTexLevelParameteriv(GL_PROXY_TEXTURE_CUBE_MAP, 0, GL_TEXTURE_WIDTH, &w);
 169    assert(w == minDim || w == 0);
 170
 171    if (w) {
 172       glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, GL_RGB,
 173                    minDim, minDim, 0,
 174                    imgFormat, GL_UNSIGNED_BYTE, image);
 175       assert(glGetError() == GL_NO_ERROR);
 176    }
 177
 178    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 179    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 180    glEnable(GL_TEXTURE_2D);
 181 }
 182
 183
 184 int main( int argc, char *argv[] )
 185 {
 186    glutInit( &argc, argv );
 187    glutInitWindowPosition( 0, 0 );
 188    glutInitWindowSize( 400, 400 );
 189    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
 190    glutCreateWindow(argv[0]);
 191    glutReshapeFunc( Reshape );
 192    glutKeyboardFunc( Key );
 193    glutDisplayFunc( Display );
 194    Init();
 195    glutMainLoop();
 196    return 0;
 197 }