If measuring the windows driver, which supports flip and copy
with a simple benchmark (one square with texture of 1024x1024) in fullscreen mode 1280x1024 32bpp
on a "slow memory like 855GM", Flip works much faster (100% .. 200%) than Copy. 160fps vs 55fps
Do you know how could i get more info about intel graphics to better understand
this topic (caching?), perhaps to find a solution ?
How long can it take to update the frame buffer address in a intel card ?
If in windows the flip works fast perhaps there is something missing.
Please any benchmark you are willing to run with the windows driver, tell me.
On 7/24/06, Ian Romanick <
[EMAIL PROTECTED]> wrote:
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Joan Bertran wrote:
> Taking into account that intel graphics cards
> are shared memory, so they don't have the bandwith
> of other gpu's the glSwapBuffers can take a
> precious time to finish if pageFlip is not
> available.
keithw did some experiments in this area some years ago. It turns that
that, due to the way the Intel chipsets do cachine, it's *faster* to do
copies than flips. I seem to recall the break-even point being for full
screen apps larger than 1280x800 or something similar. Even at that
point the difference was very small.
There are other things that could be done to the Intel driver ( e.g.,
modify it to do region-based rendering) that would improve performance
by a larger margin in more situations than adding page flipping support.
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