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An initial implementation made by Dave Airlie.
For it to be used, a color-only clear must be invoked and exactly one
point-sampled render target must be set. The render target must be
macrotiled (for us to overcome alignment issues) and bpp must be either
16 or 32.
I can't see a difference in performance. :(
Conflicts:
src/gallium/drivers/r300/r300_blit.c
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The real difference here is that ZTOP is now enabled if all stencil ops
are set to KEEP. This improves performance.
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Ideally, HiZ should go in r300_hyperz.c next to ZTOP.
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