From: Mihai Cartoaje (mcartoaj@mat.ulaval.ca)
Date: Wed 08 Aug 2001 - 20:29:37 IDT
also sprach Gregory Huczynski:
> I'm writing directly to video memory and only change one pointer to update a
> frame; in contrast, in the first version, I have to do a memory copy to update
> a frame. Any ideas why double buffering in video memory is actually slower?
Perhaps your display routine is complicated and it is slower on the PCI bus than
in memory. What is your system, what is it you draw, and what do the vga speed
test demo programs show?
The fastest way would be to have PCI bus mastering, IMO, but that hasn't been
implemented yet.
Mihai
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