New MR: https://gitlab.freedesktop.org/mesa/mesa/merge_requests/17
This MR begins the process of being able to optimize external memory access by first moving us over to using deref instructions for UBO/SSBO access. Many of the patches are cleanups or fairly small refactors of NIR or SPIR-V. More notable changes include: Reworking some NIR variable modes to properly distinguish between UBOs and other uniforms Adding support to glsl_type for explicit strides/offsets on types. Adding a new ptr-as-array deref type to NIR Adding a new nir_opt_deref pass to optimize ptr-as-array derefs Relaxing several NIR validation rules Adding support for cast derefs to a couple of passes Adding UBO/SSBO deref support to spirv_to_nir but hidden behind a flag Enabling the new path in ANV. All in all, I think I finally have a version of this that I'm actually happy with. It took several iterations to figure out how I wanted to best describe the type information coming out of SPIR-V. The glsl_type modifications ended up being not nearly as bad as I expected so I went that route. Happy reviewing! --Jason
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