Octane & Accumulation buffer

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Isabelle Lafon (isabelle++at++discreet.com)
Wed, 09 Jun 1999 13:27:37 -0400

Hi,

Did anybody already have this problem ?

Using the accumulation buffer on Octane ( 2 300 MHZ IP30 Processors,
Graphics board: EMXI, IRIX 6.5, and Frame Buffer configuration with
16bits r,g,b,a accumulation buffer) drops drastically the performances.

pfDraw();
                               => 60.0/60.0Hz Lock Draw =1.5ms

pfDraw();
glAccum( GL_LOAD, fadeValue );
glAccum( GL_RETURN, 1.0f );
                               => 4.3/60.0Hz Lock Draw =230.9ms

Using accumulation buffer has no impact on Onyx 2 - Draw times
(60.0/60.0Hz
Lock Draw =0.7ms) are the same for both case on an Onyx 2.

I was expecting a little drop of performance on the Octane but not a so
huge one.

Thanks in advance for any informations about this behavior.
Any suggestions to eliminate or dicrease this performance drop will
be very appreciate.

Isabelle.

-- 
Isabelle Lafon                 Discreet Logic
Tel: (514) 954-7157            10 Duke
Fax: (514) 393-0110            Montreal (Quebec)
isabelle++at++discreet.com          Canada, H3C 2L7

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