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gallium: document dual source blending restrictions on gallium

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As per Brian's suggestion, document the restrictions on dual src blending.

Signed-off-by: Dave Airlie <airlied@redhat.com>
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Dave Airlie
2012-04-13 17:13:01 +01:00
parent d1cc87c0b6
commit 1f2b539451
1 changed files with 5 additions and 1 deletions
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src/gallium/docs/source/cso/blend.rst
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@@ -12,7 +12,11 @@ Blend Factors
The blend factors largely follow the same pattern as their counterparts The blend factors largely follow the same pattern as their counterparts
in other modern and legacy drawing APIs. in other modern and legacy drawing APIs.
XXX blurb about dual-source blends Dual source blend factors are supported for up to 1 MRT, although
you can advertise > 1 MRT, the stack cannot handle them for a few reasons.
There is no definition on how the 1D array of shader outputs should be mapped
to something that would be a 2D array (location, index). No current hardware
exposes > 1 MRT, and we should revisit this issue if anyone ever does.
Logical Operations Logical Operations
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