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| author | Brian Paul <brianp@vmware.com> | 2016-09-15 15:32:59 -0600 |
|---|---|---|
| committer | Brian Paul <brianp@vmware.com> | 2016-09-16 08:44:26 -0600 |
| commit | 702ff0b9a017814851d119065cfeb7cd8afc95ce (patch) | |
| tree | 85d0a8ee2f80770dd87040dcc5608683e20d84fd /src/gallium/docs | |
| parent | 187c2781210a05f1e144f87fffdd4f513d2380c4 (diff) | |
| download | external_mesa3d-702ff0b9a017814851d119065cfeb7cd8afc95ce.zip external_mesa3d-702ff0b9a017814851d119065cfeb7cd8afc95ce.tar.gz external_mesa3d-702ff0b9a017814851d119065cfeb7cd8afc95ce.tar.bz2 | |
gallium/docs: document alpha_to_coverage and alpha_to_one blend state
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>
Diffstat (limited to 'src/gallium/docs')
| -rw-r--r-- | src/gallium/docs/source/cso/blend.rst | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/gallium/docs/source/cso/blend.rst b/src/gallium/docs/source/cso/blend.rst index dce999c..7316e5c 100644 --- a/src/gallium/docs/source/cso/blend.rst +++ b/src/gallium/docs/source/cso/blend.rst @@ -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 ------------------------ |