---
src/compiler/nir/nir_format_convert.h | 38 +++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/src/compiler/nir/nir_format_convert.h
b/src/compiler/nir/nir_format_convert.h
index 07618dc..0ffd0db 100644
--- a/src/compiler/nir/nir_format_convert.h
+++ b/src/compiler/nir/nir_format_convert.h
@@ -130,3 +130,41 @@ nir_format_srgb_to_linear(nir_builder *b, nir_ssa_def *c)
return nir_fsat(b, nir_bcsel(b, nir_flt(b, c, nir_imm_float(b, 0.04045f)),
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 exponent 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, 0x00007ff0, 17);
+
+ return packed;
+}
--
2.5.0.400.gff86faf
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