glDrawPixels(),Is this function should be used in the last of rendering? If I want to render after operating with pixels, but the picture which I get in the screen is the fragment which I get with the function glDrawPixels().The rendering after this function doesn't work. My operate order is: first rendering ---> glReadPixels() ---> glDrawPixels() ---> second rendering. I just want to know what should I do if I want to get the correct rendering. [Edited by - goyg on July 18, 2008 8:05:22 PM]

I think I have found the reason why the second rendering fail.
glDrawPixels() send the pixels to the fragment ,but it doesn't have any other buffers(z-buffer and the others).When do the second rendering , the fragment test will drop the second rendering. So the the second rendering doesn't work.