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etnaviv: tell the truth if alpha-test is supported

Christian Gmeiner requested to merge austriancoder/mesa:lower-alpha-test-to-shader-if-needed into master

GPUs with the feature bit PE_NO_ALPHA_TEST set have no fixed-function alpha test unit and we want to let st lower it with a shader variant.

Fixes all fbo-alphatest-formats piglits like: spec@ext_framebuffer_object@fbo-alphatest-formats spec@ext_packed_float@fbo-alphatest-formats spec@ext_texture_srgb@fbo-alphatest-formats

This only works with the NIR compiler backend.

Signed-off-by: Christian Gmeiner christian.gmeiner@gmail.com

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