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nir/format_convert: Add pack/unpack for R11F_G11F_B10F 

Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
This commit is contained in:
Jason Ekstrand 2018-01-25 22:32:16 -08:00
parent 98156b0019
commit 4e337b42f9
1 changed files with 38 additions and 0 deletions
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38
src/compiler/nir/nir_format_convert.h
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@ -130,3 +130,41 @@ nir_format_srgb_to_linear(nir_builder *b, nir_ssa_def *c)
return nir_fsat(b, nir_bcsel(b, nir_fge(b, nir_imm_float(b, 0.04045f), c),
linear, curved));
}
static inline nir_ssa_def *
nir_format_unpack_11f11f10f(nir_builder *b, nir_ssa_def *packed)
{
nir_ssa_def *chans[3];
chans[0] = nir_mask_shift(b, packed, 0x000007ff, 4);
chans[1] = nir_mask_shift(b, packed, 0x003ff100, -7);
chans[2] = nir_mask_shift(b, packed, 0xffc00000, -17);
for (unsigned i = 0; i < 3; i++)
chans[i] = nir_unpack_half_2x16_split_x(b, chans[i]);
return nir_vec(b, chans, 3);
}
static inline nir_ssa_def *
nir_format_pack_r11g11b10f(nir_builder *b, nir_ssa_def *color)
{
/* 10 and 11-bit floats are unsigned. Clamp to non-negative */
nir_ssa_def *clamped = nir_fmax(b, color, nir_imm_float(b, 0));
nir_ssa_def *undef = nir_ssa_undef(b, 1, color->bit_size);
nir_ssa_def *p1 = nir_pack_half_2x16_split(b, nir_channel(b, clamped, 0),
nir_channel(b, clamped, 1));
nir_ssa_def *p2 = nir_pack_half_2x16_split(b, nir_channel(b, clamped, 2),
undef);
/* A 10 or 11-bit float has the same exponent as a 16-bit float but with
* fewer mantissa bits and no sign bit. All we have to do is throw away
* the sign bit and the bottom mantissa bits and shift it into place.
*/
nir_ssa_def *packed = nir_imm_int(b, 0);
packed = nir_mask_shift_or(b, packed, p1, 0x00007ff0, -4);
packed = nir_mask_shift_or(b, packed, p1, 0x7ff00000, -9);
packed = nir_mask_shift_or(b, packed, p2, 0x00007fe0, 17);
return packed;
}