tree cba6ed5bbae83c7c8f943b2f580f7a1cfffc0a2a
parent 263986eb6e456ec2aa4a77deb0be739e000fb927
author LoopDawg <sk_opengl@khasekhemwy.net> 1507242352 -0600
committer LoopDawg <sk_opengl@khasekhemwy.net> 1507310596 -0600

HLSL: split textures used for both shadow and non-shadow modes

A single texture can statically appear in code mixed with a shadow sampler
and a non-shadow sampler.  This would be create invalid SPIR-V, unless
one of them is provably dead.

The previous detection of this happened before DCE, so some shaders would
trigger the error even though they wouldn't after DCE.  To handle that
case, this PR splits the texture into two: one with each mode.  It sets
"needsLegalization" (if that happens for any texture) to warn that this shader
will need post-compilation legalization.

If the texture is only used with one of the two modes, behavior is as it
was before.