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1e5fd2f839
In order to get support everywhere, this gets a bit complicated. On Sky Lake and later, everything is fine because HALIGN/VALIGN are specified in surface elements and are required to be at least 4 so any offsetting we may need to do falls neatly within the heavy restrictions placed on the X/Y Offset parameter of RENDER_SURFACE_STATE. On Broadwell and earlier, HALIGN/VALIGN are specified in pixels and are hard-coded to align to exactly the block size of the compressed texture. This means that, when reinterpreted as a non-compressed texture, the tile offsets may be anything and we can't rely on X/Y Offset. In order to work around this issue, we fall back to linear where we can trivially offset to whatever element we so choose. However, since linear texturing performance is terrible, we create a tiled shadow copy of the image to use for texturing. Whenever the user does a layout transition from anything to SHADER_READ_ONLY_OPTIMAL, we use blorp to copy the contents of the texture from the linear copy to the tiled shadow copy. This assumes that the client will use the image far more for texturing than as a storage image or render target. Even though we don't need the shadow copy on Sky Lake, we implement it this way first to make testing easier. Due to the hardware restriction that ASTC must not be linear, ASTC does not work yet. Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> |
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| getopt | ||
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| intel | ||
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| mesa | ||
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