GLPaint save image

Question

I\'m trying to develop a complex painting application on the iPhone. I\'m currently drawing using Quartz (e.g. CGContext...). Unfortunately the Quartz overhead is

Answer 1

It's definitely possible. The trick is to use glReadPixels to pull the image data out of the OpenGL framebuffer into memory you can use. Once you have a pointer to the image data, you can use CGDataProviderCreateWithData and CGImageCreate to create a CGImage from the data. I'm working on an OpenGL-based drawing app that uses this technique a lot!