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panfrost: Un/pack pure 8-bit

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Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5265>
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Alyssa Rosenzweig 2020-05-13 13:55:51 -04:00 • committed by Marge Bot
parent 9a6483bb47
commit f01aabb829
1 changed files with 37 additions and 0 deletions
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37
src/panfrost/util/pan_lower_framebuffer.c
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@ -194,6 +194,43 @@ pan_unpack_pure_16(nir_builder *b, nir_ssa_def *pack, unsigned num_components)
return nir_vec(b, unpacked, 4);
}
/* And likewise for x8. pan_fill_4 fills a 4-channel vector with a n-channel
* vector (n <= 4), replicating as needed. pan_replicate_4 constructs a
* 4-channel vector from a scalar via replication */
static nir_ssa_def *
pan_fill_4(nir_builder *b, nir_ssa_def *v)
{
nir_ssa_def *q[4];
assert(v->num_components <= 4);
for (unsigned j = 0; j < 4; ++j)
q[j] = nir_channel(b, v, j % v->num_components);
return nir_vec(b, q, 4);
}
static nir_ssa_def *
pan_replicate_4(nir_builder *b, nir_ssa_def *v)
{
nir_ssa_def *replicated[4] = { v, v, v, v };
return nir_vec(b, replicated, 4);
}
static nir_ssa_def *
pan_pack_pure_8(nir_builder *b, nir_ssa_def *v)
{
return pan_replicate_4(b, nir_pack_32_4x8(b, pan_fill_4(b, v)));
}
static nir_ssa_def *
pan_unpack_pure_8(nir_builder *b, nir_ssa_def *pack, unsigned num_components)
{
assert(num_components <= 4);
nir_ssa_def *unpacked = nir_unpack_32_4x8(b, nir_channel(b, pack, 0));
return nir_channels(b, unpacked, (1 << num_components) - 1);
}
/* Generic dispatches for un/pack regardless of format */
static nir_ssa_def *