pan/bi: Use src1/dest_invert instead of src_invert[]

This maps more closely to the hardware, which makes for easier packing.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6749>
6 files changed