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authorIan Romanick <ian.d.romanick@intel.com>2010-08-02 18:48:25 -0700
committerIan Romanick <ian.d.romanick@intel.com>2010-08-04 16:47:27 -0700
commit5a7758efbe14dee026245a4f4f4fb3ccf7b2c23b (patch)
treebe214c6f3ea4be5ec4472afa5b3426d5191380f5 /src/mesa/tnl
parent8e9ce2eb56a087c2544112700ae1abe3f96648dd (diff)
glsl2: Add ir_assignment::write_mask and associated methods
Replace swizzles on the LHS with additional swizzles on the RHS and a write mask in the assignment instruction. As part of this add ir_assignment::set_lhs. Ideally we'd make ir_assignment::lhs private to prevent erroneous writes, but that would require a lot of code butchery at this point. Add ir_assignment constructor that takes an explicit write mask. This is required for ir_assignment::clone, but it can also be used in other places. Without this, ir_assignment clones lose their write masks, and incorrect IR is generated in optimization passes. Add ir_assignment::whole_variable_written method. This method gets the variable on the LHS if the whole variable is written or NULL otherwise. This is different from ir->lhs->whole_variable_referenced() because the latter has no knowledge of the write mask stored in the ir_assignment. Gut all code from ir_to_mesa that handled swizzles on the LHS of assignments. There is probably some other refactoring that could be done here, but that can be left for another day.
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