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Fork and join phases in hull shaders allow dynamic indexing for all output registers, not just the tessellation factor built-ins. Moreover, the patch constant output register space is shared with join phases, which can read back the outputs computed in the fork phases, also allowing dynamic indexing. In order to support this in a not overly complex way, use a private array representing the entire patch constant space, and use epilogue functions to assign them to the actual output variables. Signed-off-by: Philip Rebohle <philip.rebohle@tu-dortmund.de> Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>