[Mesa-dev] [PATCH 00/18] Gallium blitter optimizations
brianp at vmware.com
Fri Aug 18 15:56:09 UTC 2017
On 08/17/2017 12:31 PM, Marek Olšák wrote:
> Major u_blitter changes:
> - All draw calls except cubemap blits will now use the draw_rectangle
> callback. (cubemap blits are not used if the driver supports texture
> - The VS POSITION output always covers the whole 2D clip space,
> (-1,-1) -> (1,1). The final vertex positions and Z are determined by
> the viewport transformation.
> - If VertexID is supported, the VS POSITION output is derived from
> VertexID, and the vertex input with POSITION data is not present.
> - If the VS GENERIC output is not needed, it's not present.
> (previously it was always there)
> - If there are no VS inputs, the blitter doesn't change vertex buffer
> and vertex element states, leading to lower CPU overhead.
> (measurable with trivial apps like glxgears)
> RadeonSI changes:
> - We only used the draw_rectangle callback for decompress and resolve
> passes, and depth and color clears. Now we will always use it when
> the blitter invokes it.
> The overall impact on RadeonSI is that only slow color clears and
> texture blits use a vertex shader that has 1 vertex input. Moving that
> input into user SGPRs would be possible, but that's not done here.
> Please review.
If you can wait a bit, I'd like to apply your patches to my tree and do
some testing to make sure our driver can handle these changes.
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