[Mesa-dev] [PATCH 00/20] RadeonSI: Optimized shader variants and other improvements

[Marek Olšák]

Hi,

Patches 1-10 are random improvements.

Patches 11-14 are cleanups.

Patches 15-20 add support for optimized shader variants compiled
asynchronously (without stalling rendering). 

The following optimizations are implemented for the shader variants:
- If user clipping is disabled, clip distances and the gl_ClipVertex
  code is removed from vertex shaders.
- All VS outputs not read by a PS are removed. All VS code that
  computes those including vertex attribute loads is removed
  automatically by dead-code elimination.
- If GL_RASTERIZER_DISCARD is set, all varyings are removed from
  vertex shaders.
- If doing depth-only rendering, it has the same behavior for
  vertex shaders as GL_RASTERIZER_DISCARD.

It's all about optimizing vertex shaders and VS output resources.

I've just realized I might have to limit the compilation of optimized
shader variants to only a limited number of threads, so that apps
aren't slowed down by this.

I hope this is just the beginning of many things we can do with
asynchronous compilation.

Please review.

Marek