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6d6aef7974
Haswell supports EXT_texture_swizzle and legacy DEPTH_TEXTURE_MODE swizzling by setting SURFACE_STATE entries. This means we don't have to bake the swizzle settings into the shader code by emitting MOV instructions, and thus don't have to recompile shaders whenever the swizzles change. Unfortunately, we can't handle GL_ALPHA this way: unlike all the others, which store the comparison result in the .r channel (and possibly others as well), GL_ALPHA puts it in the .a channel. The GLSL 1.30+ style functions which return a float always simply return the .r channel, which would be zero if we handled this as a surface override. In this case, fall back to doing it the old way. DEPTH_TEXTURE_MODE = GL_ALPHA isn't an interesting performance path anyway. Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> |
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| mesa | ||
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