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lavapipe: depth sampling

Mike Blumenkrantz requested to merge zmike/mesa:lavapipe-depth_sampling into master

This fixes using samplerviews with explicit depth-only formats set with depth-aspected imageviews, e.g.,. VK_FORMAT_D32_SFLOAT for VK_FORMAT_D32_SFLOAT_S8_UINT

I'm not 100% sure that this is correct since the spec doesn't explicitly say anything for or against it, but it seems like it should be based on:

  • every driver I've tested (ANV/RADV/NV blob) is fine with the behavior
  • there's no validation errors
  • every other mention of depth-only-aspected formats in the spec refers to only the depth component and format

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