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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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6
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
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
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