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Draft: panfrost: add hw sampling of YUV textures on bifrost

Open Italo Nicola requested to merge italove/mesa:pan_yuv into main

This MR adds a new texture descriptor for sampling single and multiplane YUV textures on bifrost. When sampling from YUV textures, the stride /offset alignment requirement may be smaller than the usual 64-bytes, so this MR also changes that requirement for the relevant formats.

The gallium/st patch is needed for making PIPE_FORMAT_NV21 behave similar to PIPE_FORMAT_NV12, by doing CSC in the shader but making use of the hw YUV texture sampler.

cc @cphealy @alyssa

Currently missing:

  • Support for some of the YUYV swizzled variants
  • Finish and cleanup pandecode patch
Edited by Italo Nicola