Accessing the Rendering buffer..

OpenGL OpenGL: Advanced Coding
1

Hi .
I wonder if there is a way to access the final OGL render before it’s drawn wit the SwapBuffers call.
I’ll explain, I need to do a some kind of radial blur on the final render, I have my own (old ASM dos) routines to do it.
Can I apply them without using DrawPixels routines ?? (They sound slow to me)

Thanks…

2

Nope, no way to access the doublebuffer, aswell as ANY buffer. But as you say, use glReadPixels, do the motionblur, and then use glDrawPixels.

3

I did distorion by copying the frame to tex mem and drawing a distorted mesh back to the frame buffer. Faster.

cheers,
John

4

Maybe the final solution is to generate a rendering, reading back the render result to a texture, applying the 2D fx and then draw a quad using the result as a texture…