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gallium/docs: document behavior of set_sample_mask() 

The sample mask is used even if msaa is not explicity enabled when we
have a framebuffer with multisampled surfaces.  That's DX behavior and
what the Radeon drivers do.  Not sure about other drivers at this point.

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
This commit is contained in:
Brian Paul 2017-12-12 20:32:06 -07:00
parent 0f2bd31baf
commit c27a6c45c2
1 changed files with 4 additions and 1 deletions
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5
src/gallium/docs/source/context.rst
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@ -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``