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panfrost: Un/pack RGB10_A2_UNORM

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It's a funny one.

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 2020-05-14 17:35:25 -04:00 • committed by Marge Bot
parent 7de0e5500b
commit 91cc678551
1 changed files with 58 additions and 0 deletions
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58
src/panfrost/util/pan_lower_framebuffer.c
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@ -333,6 +333,60 @@ pan_unpack_unorm_565(nir_builder *b, nir_ssa_def *v)
nir_imm_ivec4(b, 3, 2, 3, 0));
}
/* RGB10_A2 is packed in the tilebuffer as the bottom 3 bytes being the top
* 8-bits of RGB and the top byte being RGBA as 2-bits packed. As imirkin
* pointed out, this means free conversion to RGBX8 */
static nir_ssa_def *
pan_pack_unorm_1010102(nir_builder *b, nir_ssa_def *v)
{
nir_ssa_def *scale = nir_imm_vec4_16(b, 1023.0, 1023.0, 1023.0, 3.0);
nir_ssa_def *s = nir_f2u32(b, nir_fround_even(b, nir_f2f32(b, nir_fmul(b, nir_fsat(b, v), scale))));
nir_ssa_def *top8 = nir_ushr(b, s, nir_imm_ivec4(b, 0x2, 0x2, 0x2, 0x2));
nir_ssa_def *top8_rgb = nir_pack_32_4x8(b, nir_u2u8(b, top8));
nir_ssa_def *bottom2 = nir_iand(b, s, nir_imm_ivec4(b, 0x3, 0x3, 0x3, 0x3));
nir_ssa_def *top =
nir_ior(b,
nir_ior(b,
nir_ishl(b, nir_channel(b, bottom2, 0), nir_imm_int(b, 24 + 0)),
nir_ishl(b, nir_channel(b, bottom2, 1), nir_imm_int(b, 24 + 2))),
nir_ior(b,
nir_ishl(b, nir_channel(b, bottom2, 2), nir_imm_int(b, 24 + 4)),
nir_ishl(b, nir_channel(b, bottom2, 3), nir_imm_int(b, 24 + 6))));
nir_ssa_def *p = nir_ior(b, top, top8_rgb);
return pan_replicate_4(b, p);
}
static nir_ssa_def *
pan_unpack_unorm_1010102(nir_builder *b, nir_ssa_def *packed)
{
nir_ssa_def *p = nir_channel(b, packed, 0);
nir_ssa_def *bytes = nir_unpack_32_4x8(b, p);
nir_ssa_def *ubytes = nir_u2u16(b, bytes);
nir_ssa_def *shifts = nir_ushr(b, pan_replicate_4(b, nir_channel(b, ubytes, 3)),
nir_imm_ivec4(b, 0, 2, 4, 6));
nir_ssa_def *precision = nir_iand(b, shifts,
nir_i2i16(b, nir_imm_ivec4(b, 0x3, 0x3, 0x3, 0x3)));
nir_ssa_def *top_rgb = nir_ishl(b, nir_channels(b, ubytes, 0x7), nir_imm_int(b, 2));
top_rgb = nir_ior(b, nir_channels(b, precision, 0x7), top_rgb);
nir_ssa_def *chans [4] = {
nir_channel(b, top_rgb, 0),
nir_channel(b, top_rgb, 1),
nir_channel(b, top_rgb, 2),
nir_channel(b, precision, 3)
};
nir_ssa_def *scale = nir_imm_vec4(b, 1.0 / 1023.0, 1.0 / 1023.0, 1.0 / 1023.0, 1.0 / 3.0);
return nir_f2f16(b, nir_fmul(b, nir_u2f32(b, nir_vec(b, chans, 4)), scale));
}
/* Generic dispatches for un/pack regardless of format */
static bool
@ -386,6 +440,8 @@ pan_unpack(nir_builder *b,
return pan_unpack_unorm_5551(b, packed);
case PIPE_FORMAT_B5G6R5_UNORM:
return pan_unpack_unorm_565(b, packed);
case PIPE_FORMAT_R10G10B10A2_UNORM:
return pan_unpack_unorm_1010102(b, packed);
default:
break;
}
@ -429,6 +485,8 @@ pan_pack(nir_builder *b,
return pan_pack_unorm_5551(b, unpacked);
case PIPE_FORMAT_B5G6R5_UNORM:
return pan_pack_unorm_565(b, unpacked);
case PIPE_FORMAT_R10G10B10A2_UNORM:
return pan_pack_unorm_1010102(b, unpacked);
default:
break;
}