EAGLLayer 2 CGImage/UIImage anyone ?
Post: #1
I'm trying to capture my non opaque eaglView, so I can composite it together with background UIView's layers into a PNG file.
Someone suggested me using glReadPixels, till now, and I'm a novice, this is how my code looks like:
I'm getting an empty screen though. I have actually no way of knowing that I'm doing the right things converting the data form GLubyte to something readable by CoreCraphics, or maybe I am not using glReadPixels right.
Any help would be greatly appreciated !
Someone suggested me using glReadPixels, till now, and I'm a novice, this is how my code looks like:
Code:
-(UIImage *) getMyEAGLLayerAsAUIIamge {
CGRect myRect = [UIScreen mainScreen].applicationFrame;
NSInteger myDataLength = myRect.size.width * myRect.size.height * 4;
void *buffer = (GLubyte *) malloc(myDataLength);
// glReadBuffer(GL_FRONT);
glFinish();
glPixelStorei(GL_PACK_ALIGNMENT, 4);
glReadPixels(myRect.origin.x, myRect.origin.y, myRect.size.width, myRect.size.height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
NSData* myImageData = [NSData dataWithBytesNoCopy:(unsigned char const **)&buffer length:myDataLength freeWhenDone:YES];
if( [UIImage respondsToSelector:@selector(imageWithData:)])
NSLog(@"supported");
else NSLog(@"unsupported");
UIImage *myImage = [UIImage imageWithData:myImageData];
if( myImage != nil) { NSLog(@"Save EAGLImage failed to bind data to a IUImage"); }
return myImage;I'm getting an empty screen though. I have actually no way of knowing that I'm doing the right things converting the data form GLubyte to something readable by CoreCraphics, or maybe I am not using glReadPixels right.
Any help would be greatly appreciated !
