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The GPU (at least a3xx, but I think also a2xx) can render directly to
memory, bypassing tiling. Although it can't do this if blend, depth,
and a few other features of the pipeline are enabled. This direct
memory mode can be faster for some sorts of operations, such as simple
blits. In particular, this significantly speeds up XA by avoiding to
pull the entire dest pixmap into GMEM, render tiles, and write it all
back out again. This should also speed up resource copy-region and
blit.
Signed-off-by: Rob Clark <[email protected]>
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Split the parts that are specific to adreno a2xx series GPUs from the
parts that will be in common with a3xx, so that a3xx support can be
added more cleanly.
Signed-off-by: Rob Clark <[email protected]>
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Optimize out parts of the render target that are scissored out by taking
into account maximal scissor bounds in fd_gmem_render_tiles().
This is a big win on things like gnome-shell which frequently do partial
screen updates.
Signed-off-by: Rob Clark <[email protected]>
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Currently works on a220. Others in the a2xx family look pretty similar
and should be pretty straightforward to support with the same driver.
The a3xx has a new shader ISA, and while many registers appear similar,
the register addresses have been completely shuffled around. I am not
sure yet whether it is best to support with the same driver, but
different compiler, or whether it should be split into a different
driver.
v1: original
v2: build file updates from review comments, and remove GPL licensed
header files from msm kernel
v3: smarter temp/pred register assignment, fix clear and depth/stencil
format issues, resource_transfer fixes, scissor fixes
Signed-off-by: Rob Clark <[email protected]>
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