This field also affects triangle strip and triangle fan ordering, so we
would get the incorrect (D3D) order with tessellation and geometry
shaders both enabled. Instead flip clockwise/counterclockwise when
the domain origin is upper-left, as radv does.
Because the register is only emitted when tessellation is active which
forces sysmem, it shouldn't regress performance to emit it directly
instead of using a draw state. We're already very tight on draw states.
Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22301>
Connor Abbott
5704d0ad27