Metal-RT implementation for curve intersect has an additional self
intersection check happening in curve_ribbon_accept(). It is done
for all curve types that has PRIMITIVE_CURVE_RIBBON bit set on them,
including Thick Linear curves. However, the logic in the function is
hardcoded to handle flat ribbon curves with the Catmull Rom basis.
This change makes it so curve_ribbon_accept() is only called for the
ribbon curve type, not when type has ribbon bit set.
Additionally, other places where curve type was checked as a bitmask
were fixed.
Ref #146072
Pull Request: https://projects.blender.org/blender/blender/pulls/146140
15fd8ad7a1