diff options
| author | Boris Brezillon <[email protected]> | 2020-01-24 09:22:48 +0100 |
|---|---|---|
| committer | Marge Bot <[email protected]> | 2020-01-27 15:24:54 +0000 |
| commit | aa973fc14e140753d3c5b47eda79e451c1dc61ed (patch) | |
| tree | 07af1ad1d4b580a24d6e0a284b9dad001c28bf53 /src/panfrost/midgard/helpers.h | |
| parent | 2dc63d39d31d56ce44154372c1d1771c73d22a68 (diff) | |
panfrost/midgard: Add a condense_writemask() helper
This way we can convert an 8-bit writemask (Midgard specific
representation) into the more common 1-bit/component representation.
8-bit mode is not supported yet, as we're not sure how the writemask is
encoded for this mode.
Signed-off-by: Boris Brezillon <[email protected]>
Reviewed-by: Alyssa Rosenzweig <[email protected]>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3536>
Diffstat (limited to 'src/panfrost/midgard/helpers.h')
| -rw-r--r-- | src/panfrost/midgard/helpers.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/panfrost/midgard/helpers.h b/src/panfrost/midgard/helpers.h index d2bfc18273e..66223f3fd78 100644 --- a/src/panfrost/midgard/helpers.h +++ b/src/panfrost/midgard/helpers.h @@ -254,6 +254,28 @@ expand_writemask(unsigned mask, unsigned channels) return o; } +/* Tansform an expanded writemask (duplicated 8-bit format) into its condensed + * form (one bit per component) */ + +static inline unsigned +condense_writemask(unsigned expanded_mask, + unsigned bits_per_component) +{ + if (bits_per_component == 8) + unreachable("XXX TODO: sort out how 8-bit constant encoding works"); + + unsigned slots_per_component = bits_per_component / 16; + unsigned max_comp = (16 * 8) / bits_per_component; + unsigned condensed_mask = 0; + + for (unsigned i = 0; i < max_comp; i++) { + if (expanded_mask & (1 << (i * slots_per_component))) + condensed_mask |= (1 << i); + } + + return condensed_mask; +} + /* Coerce structs to integer */ static inline unsigned |