[Mesa-dev] MR: ARB_gl_spirv xfb improvement

[apinheiro]

https://gitlab.freedesktop.org/mesa/mesa/merge_requests/63

This series started as just trying to use the general NIR xfb gathering
pass, added for Vulkan consumption, and ended fixing some corner cases
on such gathering, and on the ARB_gl_spirv support for xfb itself. All
that can be tested on piglit here:
https://github.com/Igalia/piglit/tree/apinheiro/xfb

For now a personal branch. It is mostly done, but it is pending the
double checking before sending to review.

As part of this series, we also change how input arrays of blocks are
splitted, in order to support interpolators qualifiers for such case.

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