Mesa (master): gallium/docs: document alpha_to_coverage and alpha_to_one blend state

[Brian Paul]

Module: Mesa
Branch: master
Commit: 702ff0b9a017814851d119065cfeb7cd8afc95ce
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=702ff0b9a017814851d119065cfeb7cd8afc95ce

Author: Brian Paul <brianp at vmware.com>
Date:   Thu Sep 15 15:32:59 2016 -0600

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 at vmware.com>

---

 src/gallium/docs/source/cso/blend.rst | 12 ++++++++++++
 1 file changed, 12 insertions(+)

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
 ------------------------