This is the third revision of my changes to add support for gl_ClipDistance with Gallium. The difference between this set and v2 is that this set does not add a new TGSI_PROPERTY indicating the number of clip distances used. Instead, the UsageMask of the CLIPDIST output registers is set to indicate which clip distances are used. Some changes to ureg were necessary to set the UsageMask to a value other than XYZW.
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