gistfile1.m

- (void)setupTexture
{
	CGDataProviderRef provider = CGDataProviderCreateWithFilename([imagePath UTF8String]);
    CGImageRef image = CGImageCreateWithPNGDataProvider(provider, NULL, true, kCGRenderingIntentDefault);
    CGDataProviderRelease(provider);
	size_t width = CGImageGetWidth(image);
	size_t height = CGImageGetHeight(image);
	
	realloc(textureData, width * height * 4);
	CGContextRef textureContext = CGBitmapContextCreate(textureData, width, height, 8, width * 4, CGColorSpaceCreateDeviceRGB(), kCGImageAlphaPremultipliedLast);
	CGContextDrawImage(textureContext, CGRectMake(0, 0, width, height), image);
	CGImageRelease(image);
	CGContextRelease(textureContext);
}