A lot of space was wasted due to 16-byte alignment for slots. This new
layout tries to match glthread. Highlights:
- the slot size changed to 8 bytes (was 16), so less padding
- the header size changed to 4 bytes (was 8), so some calls can use
the remaining 4 bytes in the slot for parameters
- draw merging merges up to 307 draws (was 256) due to space savings
- parameters in structures are sorted based on implicit type alignment
(uint8_t first, pointers last) to make it easier to utilize the 4 bytes
after the header and to remove holes
- some structures use smaller types for parameters than pipe_context where
it's safe (e.g. clear uses float instead of double for depth)
Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.eric.pelloux-prayer@amd.com>
Acked-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10606>
Marek Olšák
1233c90ab4