Multi-pass rendering again !

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Space Magic Team (arnaud++at++pobox.oleane.com)
Wed, 12 Mar 1997 11:00:52 +0100

Thank you to Javier Castellar and Moshe Nissim for all the performance
details which aren't obvious for me in the hardware documentation...
Another question that I have concerns the maximum performance I can expect
from a framebuffer copy into the texture memory.
At this time, I use an internal format PFTEX_RGB8 for my texture, and I
obtain a time of 14ms for the transfer of a 1024x1024 texture with 2 RM6s.
Is it logical ?
Does this time depend linearly of the number of RM ?
How doest it vary in function of internal format of texels ?
If I take the hardware documentation, it precises that one RM6 has a 80Mb
transfer rate between frame buffer and texture memory, so for 3 eight bits
components texels and 2 RM6s, the practical time that I have corresponds to
a transfer rate of 180 Mb and not 160 Mb ?
Am I exploding the performances of the IR (I don't believe so) or am I
making a mistake in my computations ?
Thanx.

                                           Philippe Poutignat
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