render improvements

[Cameron]

Bring m video game thingy too (the transparent cartridge).

-Cameron

On Tuesday April 19 2005 1:58 pm, Alan Cox wrote:
> On Maw, 2005-04-19 at 16:01, Owen Taylor wrote:
> > Well, no, it's just mildly bad, assuming that you have enough free
> > scratch space to copy the pixmap into video ram immediately before
> > compositing it... if compositing is just limited by system => video
> > bandwidth, that still is pretty good.
>
> You might be better off tiling for large operations anyway. The loop
> then becomes close to maximally efficient when using DMA and DRI to
> retrieve tiles from the video ram
>
> 	kick DMA off for tile n+1
> 	Render tile n
> 	polled wait DMA complete n+1
>
> overlapping full speed bus transfers with software rendering.
>
>
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