I am trying to get a fragment program to modify the pixels drawn using a glDrawPixels() call. The spec seems to imply that this should work, but my pixels remain the same.
The fragment shader is definately working as a rectangle drawn using glBegin(GL_TRIANGLE_STRIP), glVertex2f(), glEnd() is shaded.
Any ideas anyone?
This is using a GeForce FX5800 on Linux, using the latest driver 53.28