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mesa/st: always use DXT5 when transcoding ASTC format

Tapani Pälli requested to merge tpalli/mesa:astc_alpha_fix into main

This fixes artifacts seen in games when using ASTC transcoding, we need to use DXT5 for proper alpha channel support.

Number of components is a block specific property, there is no easy way to see if we will require >1bit alpha support or not, so simply use DXT5 to have support in place.

Signed-off-by: Tapani Pälli tapani.palli@intel.com

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