same texture binding on every "quad" - ios

Question

I have 6 squares made up of 2 trangles, each of which is supposed to have a different texture mapped onto it. Instead, each texture is having the last binded texture on it instead of its own. Heres my drawView and setView:
- (void)drawView:(GLView*)view
{
glBindTexture(GL_TEXTURE_2D, texture[0]);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
static const Vertex3D vertices[] = {
{0,0, 1}, //TL
{ 1024,0, 1}, //TR
{0,-1024, 1}, //BL
{ 1024.0f, -1024.0f, 1} //BR
};
static const GLfloat texCoords[] = {
0.0, 1.0,
1.0, 1.0,
0.0, 0.0,
1.0, 0.0
};
glVertexPointer(3, GL_FLOAT, 0, vertices);
glTexCoordPointer(2, GL_FLOAT, 0, texCoords);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
}
- (void)setupView:(GLView*)view {
// Bind the number of textures we need.
glGenTextures(1, &texture[0]);
glBindTexture(GL_TEXTURE_2D, texture[0]);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_GENERATE_MIPMAP,GL_TRUE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glLoadIdentity();
NSString *path = [[NSBundle mainBundle] pathForResource:filename ofType:#"jpg"];
NSData *texData = [[NSData alloc] initWithContentsOfFile:path];
UIImage *image = [[UIImage alloc] initWithData:texData];
if (image == nil)
NSLog(#"Do real error checking here");
GLuint width = CGImageGetWidth(image.CGImage);
GLuint height = CGImageGetHeight(image.CGImage);
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
void *imageData = malloc( height * width * 4 );
CGContextRef context = CGBitmapContextCreate( imageData, width, height, 8, 4 * width, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big );
// Flip the Y-axis
CGContextTranslateCTM (context, 0, height);
CGContextScaleCTM (context, 1.0, -1.0);
CGColorSpaceRelease( colorSpace );
CGContextClearRect( context, CGRectMake( 0, 0, width, height ) );
CGContextDrawImage( context, CGRectMake( 0, 0, width, height ), image.CGImage );
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, imageData);
CGContextRelease(context);
free(imageData);
}

Answer 1

You're always using texture[0], so you will indeed get the same texture every time. You need to pass the id of the texture you want to glBindTexture ().

Answer 2

I think the problem is related to the texture binding and in particular to this line:
glBindTexture(GL_TEXTURE_2D, texture[0]);
Double check that you use the right value of the gluint required for the texture binding.
Are you using shaders? In case double check it as well though it is most probably not the case.
I suggest to use texture atlas in order to not kill the overall engine's performances by binding every time a different texture in the GPU.