A good question. I have no idea what d3d10 does there (since a conversion from alpha to coverage doesn't really make sense as the alpha values don't actually go from 0 to 1). I suppose they could be translated away in the state tracker as well since the combination doesn't make sense (albeit we don't do that for d3d10 - maybe this behavior isn't tested).
But in any case, this documentation is an improvement. (alpha_to_one is not possible with d3d10, therefore the semantics could be different, but it probably makes sense it follows the same rules.) Reviewed-by: Roland Scheidegger <srol...@vmware.com> Am 15.09.2016 um 23:35 schrieb Ilia Mirkin: > What about integer RTs? I had to add a hack in nouveau to make it > disable those when RT0 is an integer. It'd be more convenient if they > were turned off in the first place. > > On Thu, Sep 15, 2016 at 5:34 PM, Brian Paul <bri...@vmware.com> wrote: >> 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. >> --- >> 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 >> ------------------------ >> -- _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
