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In the Intel backend, it makes the most sense to treat gl_TessLevelInner and gl_TessLevelOuter as ordinary shader inputs. For Radeon, it makes more sense to treat them as system values which get special handling. We already have a compiler option for this, but the Iris driver will need a capability bit so we can set it appropriately. Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
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