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-rw-r--r--src/gallium/docs/source/context.rst5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/gallium/docs/source/context.rst b/src/gallium/docs/source/context.rst
index 9d069b37d7e..0ac73402422 100644
--- a/src/gallium/docs/source/context.rst
+++ b/src/gallium/docs/source/context.rst
@@ -64,7 +64,10 @@ objects. They all follow simple, one-method binding calls, e.g.
* ``set_stencil_ref`` sets the stencil front and back reference values
which are used as comparison values in stencil test.
* ``set_blend_color``
-* ``set_sample_mask``
+* ``set_sample_mask`` sets the per-context multisample sample mask. Note
+ that this takes effect even if multisampling is not explicitly enabled if
+ the frambuffer surface(s) are multisampled. Also, this mask is AND-ed
+ with the optional fragment shader sample mask output (when emitted).
* ``set_min_samples`` sets the minimum number of samples that must be run.
* ``set_clip_state``
* ``set_polygon_stipple``