Comment 146 for bug 217908
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#146 |
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a60fb26
(Get the code!)
(In reply to comment #13)
> 8 isn't big enough since the EXA pitch alignment is 64 bytes.
Argh. Try the 16x16 test. I also forgot this doesn't matter for >= R300, so I was hitting acceleration even with 2x2.
(In reply to comment #14)
> Some documentation about hardware restrictions would be quite cool - I am
> currently working on a Java2D XRender backend - and optimal performance across
> different driver/gpu combinations causes a lot of guessing.
In general, older hardware tends to only support repeat with power-of-two dimensions. And pre-R300 Radeons have this peculiarity where you can't choose an explicit pitch for power-of-two textures, the hardware just rounds up the width to the next multiple of 32 bytes. For other reasons, we can currently only use multiples of 64 bytes for the pitch, so if those pitches don't match (and the height is > 1) we can't do repeat. See RADEONPitchMatc
(In reply to comment #12)
> Sorry, I probably should have mentioned this earlier. This is a known bug in
> pixman:
>
> http://
So it looks like this patch already gets us ahead of software fallbacks, at least on >= R300. :)