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panfrost: Un/pack 8-bit UNORM

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Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5265>
This commit is contained in:
Alyssa Rosenzweig
2020-05-13 14:06:55 -04:00
committed by Marge Bot
parent f01aabb829
commit e937dd521b
1 changed files with 20 additions and 0 deletions
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src/panfrost/util/pan_lower_framebuffer.c
+20
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@@ -231,6 +231,26 @@ pan_unpack_pure_8(nir_builder *b, nir_ssa_def *pack, unsigned num_components)
return nir_channels(b, unpacked, (1 << num_components) - 1);
}
/* UNORM 8 is unpacked to f16 vec4. We could directly use the un/pack_unorm_4x8
* ops provided we replicate appropriately, but for packing we'd rather stay in
* 8/16-bit whereas the NIR op forces 32-bit, so we do it manually */
static nir_ssa_def *
pan_pack_unorm_8(nir_builder *b, nir_ssa_def *v)
{
return pan_replicate_4(b, nir_pack_32_4x8(b,
nir_f2u8(b, nir_fround_even(b, nir_fmul(b, nir_fsat(b,
pan_fill_4(b, v)), nir_imm_float16(b, 255.0))))));
}
static nir_ssa_def *
pan_unpack_unorm_8(nir_builder *b, nir_ssa_def *pack, unsigned num_components)
{
assert(num_components <= 4);
nir_ssa_def *unpacked = nir_unpack_unorm_4x8(b, nir_channel(b, pack, 0));
return nir_f2f16(b, unpacked);
}
/* Generic dispatches for un/pack regardless of format */
static nir_ssa_def *