[Mesa-dev] [PATCH] swr: correct setting of independentAlphaBlendEnable

[Ilia Mirkin]

This setting is for whether color and alpha have different blend
settings, not for whether blending is enabled on a per-RT basis.

Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
---

This fixes gl-1.0-blend-func. Not 100% sure why this setting is a thing, as
opposed to just looking at the values directly, but ... wtvr.

 src/gallium/drivers/swr/swr_state.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/swr/swr_state.cpp b/src/gallium/drivers/swr/swr_state.cpp
index d19acfb..65327f3 100644
--- a/src/gallium/drivers/swr/swr_state.cpp
+++ b/src/gallium/drivers/swr/swr_state.cpp
@@ -1318,7 +1318,12 @@ swr_update_derived(struct pipe_context *pipe,
             compileState.desc.alphaTestEnable =
                ctx->depth_stencil->alpha.enabled;
             compileState.desc.independentAlphaBlendEnable =
-               ctx->blend->pipe.independent_blend_enable;
+               (compileState.blendState.sourceBlendFactor !=
+                compileState.blendState.sourceAlphaBlendFactor) ||
+               (compileState.blendState.destBlendFactor !=
+                compileState.blendState.destAlphaBlendFactor) ||
+               (compileState.blendState.colorBlendFunc !=
+                compileState.blendState.alphaBlendFunc);
             compileState.desc.alphaToCoverageEnable =
                ctx->blend->pipe.alpha_to_coverage;
             compileState.desc.sampleMaskEnable = 0; // XXX
-- 
2.7.3