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gallium/docs: document alpha_to_coverage and alpha_to_one blend state

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The gallium interface defines these like DX10.  Note that OpenGL ignores
these options if MSAA is disabled or the dest buffer doesn't support
MSAA.

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
This commit is contained in:
Brian Paul
2016-09-15 15:32:59 -06:00
parent 187c278121
commit 702ff0b9a0
1 changed files with 12 additions and 0 deletions
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src/gallium/docs/source/cso/blend.rst
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@@ -88,6 +88,18 @@ independent_blend_enable
the first member of the rt array contains valid data.
rt
Contains the per-rendertarget blend state.
alpha_to_coverage
If enabled, the fragment's alpha value is used to override the fragment's
coverage mask. The coverage mask will be all zeros if the alpha value is
zero. The coverage mask will be all ones if the alpha value is one.
Otherwise, the number of bits set in the coverage mask will be proportional
to the alpha value. Note that this step happens regardless of whether
multisample is enabled or the destination buffer is multisampled.
alpha_to_one
If enabled, the fragment's alpha value will be set to one. As with
alpha_to_coverage, this step happens regardless of whether multisample
is enabled or the destination buffer is multisampled.
Per-rendertarget Members
------------------------