iPhone OpenGL: textures de carrelage

Question

Je suis un peu coincé sur les textures de carrelage. Fondamentalement je veux carreler des textures quand je transforme un objet. Donc un carré 1x1x1 quand je glScale à 20,20,20, je voudrais que la texture colle. La texture est configuré comme un 1x1,

- (void)loadTextures:(NSString *)textureName andWithIndex:(int)index { 

// load image as a CG ref 
CGImageRef textureImage = [UIImage imageNamed:textureName].CGImage; 
// if failed, bail 
if (!textureImage) { 
    NSLog(@"Error: failed to load texture"); 
    return; 
} 


// figure out the width and height 
int texWidth = CGImageGetWidth(textureImage); 
int texHeight = CGImageGetHeight(textureImage); 

// alloc space for the texture 
GLubyte *textureData = (GLubyte *)malloc(texWidth * texHeight * 4); 

// create a CA context ref 
CGContextRef textureContext = CGBitmapContextCreate( 
       textureData, texWidth, texHeight, 8, texWidth * 4, 
       CGImageGetColorSpace(textureImage), 
       kCGImageAlphaPremultipliedLast 
      ); 

// draw the image to in-memory buffer 
CGContextDrawImage(textureContext, CGRectMake(0,0,texWidth,texHeight), textureImage); 

// done with context - release it 
CGContextRelease(textureContext); 

// have GL create handle for our texture 
glGenTextures(1, &textures[index]); 

// tell GL that the image is 2D 
glBindTexture(GL_TEXTURE_2D, textures[index]); 

// send our data down to GL, copy into graphics hardware 
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texWidth, texHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, textureData); 

// free our in-memory copy of the data 
free(textureData); 

// specify min/max filters 
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); 
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); 

// tell GL to turn on textures 
glEnable(GL_TEXTURE_2D); 
} 

Answer 1

glMatrixMode(GL_TEXTURE); 
glLoadIdentity(); 
glScalef(20,20,1); 
glMatrixMode(GL_MODELVIEW);