The clear FS shaders will statically use slot numbers from 0 up to the
number of supported render targets. However, the driver will remap those
slots to the actual render targets being cleared.
This means that ir3 should not make any assumptions about the static
slot number in those cases. This is especially important when
implementing alias.rt, which statically encodes the render target.
Add an new ir3_shader_option (fragdata_dynamic_remap) which allows the
driver to indicate to ir3 that it will perform such dynamic remapping.
Signed-off-by: Job Noorman <jnoorman@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31222>
b8b3fe20b2