a501a2dbff
This adds a new mirror image extension type for shaders and geometry nodes (next to the existing repeat, extend and clip options). See D16432 for a more detailed explanation of `wrap_mirror`. This also adds a new sampler flag `GPU_SAMPLER_MIRROR_REPEAT`. It acts as a modifier to `GPU_SAMPLER_REPEAT`, so any `REPEAT` flag must be set for the `MIRROR` flag to have an effect. Differential Revision: https://developer.blender.org/D16432