Is it possible to read back buffers/textures on the CPU?

[wyvernbw]

Thank you for work on this library. It's great and has a lot of potential :)

I wish to know if there's a way to read back data sent to the gpu. Is it possible to have the shader draw something to a buffer, read it back on the cpu and for example save it to an image? I've looked at the framebuffer examples but i don't really get how you can get data out of them.