How to take a screen image with OpenGL?

[Johanovski]

Hi there!

I'm wondering if it's possible to take a screen image and then use it in OpenGL. I want to take a screenshot during the game loading so I can then print only the screenshot and release any other images that were loaded (so user will see the frozen game image but all game data will be released and no bad accesses will be thrown), it is possible? Are there any methods of taking the screenshot and then naming, saving and getting it?

Thanks!

[Mr Jack]

Why isn't the organizer method of taking a screen shot suitable in this case?

You could use glReadPixels or the Apple get screen shot function I can't remember the name of; but for what you want to do it sounds like it'd be a lot more hassle than just using the organizer.

[yarri]

Originally Posted by Johanovski

I'm wondering if it's possible to take a screen image and then use it in OpenGL.

I use something like this to capture the EAGLview screenshot and stuff it into a texture:

UIGraphicsBeginImageContext(myView.bounds.size);
[myView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Texture2D *tex = [[Texture2D alloc] initWithImage:viewImage];


--yarri