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panfrost: Emulate GL_CLAMP on Bifrost

Alyssa Rosenzweig requested to merge alyssa/mesa:glclamp into main

Hardware support was removed with Midgard. Use mesa/st to emulate GL_CLAMP with nir_lower_tex automatically (the Zink lowering), and disable GL_MIRROR_CLAMP which isn't lowered correctly.

Fixes texwrap Piglit tests on G52.

Fixes: f9ceab7b ("panfrost: Fix CLAMP wrap mode") Signed-off-by: Alyssa Rosenzweig alyssa@collabora.com

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