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Accum buffer

Started by RamboBones Feb 17, 2003 at 3:29 AM 2 replies 250+ views

Original Post

Feb 17, 2003 at 3:29 AM

I''ve been having some problems with the accumulation buffer. High on the list is it running at a speed of about 1 FPS. Actually that''s the only thing on the list :E. I''m trying to implement a simply motion blur effect using glAccum(GL_MULT,0.9f); Then render 100 triangle texture mapped object glAccum(GL_ACCUM,0.1f); glAccum(GL_RETURN,1.0f); Now I can see that the accumulater buffer would be doing all those operations on a pixel by pixel basis but, shouldn''t it be faster than that. I''ve tested it on a ge force 4 and it still runs slow. Can anyone shed some light?

QWERTY

Feb 17, 2003 at 3:58 AM

AFAIK accum buffer is not supported by today''s hardware so all the computations are done entirely in software, therefore the low speed. I suggest you useing another technique to do motion blur such as rendering your objects to texture and then blending a few of previous frames on screen.

Maximus

Feb 17, 2003 at 4:54 AM

The Radeon9500/9700 cards are the only consumer cards that support a hardware accumulation buffer, afaik.

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"When I have a problem on an Nvidia, I assume that it is my fault. With anyone else''s drivers, I assume it is their fault" - John Carmack

RamboBones

Author

RamboBones

Feb 17, 2003 at 2:22 PM

Thanks guys, hopefully the accumulation buffer will become more common.

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