unai: Use 8.8 RGB triplet format for gouraud shading Use a new 'gcol_t' type which fits in 64 bits, and encode each color component into a 8.8 fixed-point format. This boosts the precision of the gouraud shading algorithm, at almost zero cost. Fixes #320. Signed-off-by: Paul Cercueil <paul@crapouillou.net>
gpu_unai: sync with libretro
rename gpu_senquack to gpu_unai to reduce the pain of syncing with libretro
rename gpu_unai to gpu_unai_old Because libretro's gpu_unai is different, making syncing the branches a PITA.