I'm loading a texture atlas [XCode 5.1.1, IOS 6.1], using GLKTextureLoader, as per quite a few articles online, thus:
NSDictionary * options = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES],
GLKTextureLoaderOriginBottomLeft,
nil];
NSError * error;
NSString *path = [[NSBundle mainBundle] pathForResource:fileName ofType:nil];
self.textureInfo = [GLKTextureLoader textureWithContentsOfFile:path options:options error:&error];
if (self.textureInfo == nil) {
NSLog(@"Error loading file: %@ %@",fileName, [error localizedDescription]);
return nil;
}
I've searched and searched, but cannot find out how to get a pointer to the actually pixel data. I want to use glReadPixels to overwrite some of the pixel data from an offscreen framebuffer.
Max