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e57b98bad3
We were fixing up the blend factor to ZERO, however this only works correctly with fixed point render buffers where the input values are clamped to 0/1 (because src_alpha_saturate is min(As, 1-Ad) so can be negative with unclamped inputs). Haven't seen any failure anywhere due to that with fixed point SNORM buffers (which clamp inputs to -1/1) but it should apply there as well (snorm blending is rare, even opengl 4.3 doesn't require snorm rendertargets at all, d3d10 requires them but they are not blendable). Doesn't look like piglit hits this though (some internal testing hits the float case at least). (With legacy OpenGL we could theoretically still use the fixup to zero if the fragment color clamp is enabled, but we can't detect that easily since we don't support native clamping hence it gets baked into the shader.) Reviewed-by: Jose Fonseca <jfonseca@vmware.com> Reviewed-by: Zack Rusin <zackr@vmware.com> |
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