From: faculaganymede (faculaganymede++at++yahoo.com)
Date: 12/16/2003 18:30:01
Hello all,
I need to manipulate the RGBA color components of the
framebuffer so the scene that's supposed to be
rendered has the final RGBA = (orig RGBA * 4x4
matrix).
So far, I've tried several methods (as followed), but
none of them produce the required frame rate. The
targeted frame rate is 200Hz for a frame size of
512x512, but I can only get 60Hz-100Hz using these
methods for a very simple application, on an Onyx300
InfiniteReality3. Anyone has any thoughts or
suggestions on this?
1. Using glCopyPixels() and GL color matrix transform,
...
glMatrixMode(GL_COLOR);
glPushMatrix();
glLoadMatrixf((const GLfloat*)colorMat);
...
2. Using GL accumulation buffer along with its
multiplication and addition operations.
3. Using Auxiliary buffer, pfDraw to GL_AUX0 and then
copy the pixel data back to the color buffers after a
matrix transformation.
=====
Thanks,
faculaganymede
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