I believe depth clears should not be affected by pipe_depth_state::writemask.
I suspect that the only reason depth mask is not explicitly enable is because
it is a boolean, unlike color/stencil write mask which are proper bitmasks.
Therefore there is no additional information in depth write mask
Just want to check an inconsistency,
so GL clears respect glDepthMask, gallium docs don't explicitly
mention depth masking, they say clear isn't affected by color or
stencil write masks, should that sentence contain depth?
Dave.
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