mesa: bptc fixes for decompress rgba_unorm and rgb_float

Save bit_offset between iterations fixes for piglit:
* LIBGL_ALWAYS_SOFTWARE=true GALLIUM_DRIVER=softpipe piglit/bin/bptc-float-modes
* LIBGL_ALWAYS_SOFTWARE=true GALLIUM_DRIVER=llvmpipe piglit/bin/bptc-float-modes

Memset to zero in reserved mode for rgba_unorm fixes for VK-GL-CTS with libvulkan_val:
* dEQP-VK.texture.compressed.bc7_unorm_block_2d_pot
* dEQP-VK.texture.compressed.bc7_srgb_block_2d_pot
* dEQP-VK.texture.compressed.bc7_unorm_block_2d_npot
* dEQP-VK.texture.compressed.bc7_srgb_block_2d_npot

Signed-off-by: Denis Pauk <pauk.denis@gmail.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Acked-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6809>
1 file changed