-static nir_ssa_def *radv_meta_build_resolve_srgb_conversion(nir_builder *b,
- nir_ssa_def *input)
-{
- nir_const_value v;
- unsigned i;
- v.u32[0] = 0x3b4d2e1c; // 0.00313080009
-
- nir_ssa_def *cmp[3];
- for (i = 0; i < 3; i++)
- cmp[i] = nir_flt(b, nir_channel(b, input, i),
- nir_build_imm(b, 1, 32, v));
-
- nir_ssa_def *ltvals[3];
- v.f32[0] = 12.92;
- for (i = 0; i < 3; i++)
- ltvals[i] = nir_fmul(b, nir_channel(b, input, i),
- nir_build_imm(b, 1, 32, v));
-
- nir_ssa_def *gtvals[3];
-
- for (i = 0; i < 3; i++) {
- v.f32[0] = 1.0/2.4;
- gtvals[i] = nir_fpow(b, nir_channel(b, input, i),
- nir_build_imm(b, 1, 32, v));
- v.f32[0] = 1.055;
- gtvals[i] = nir_fmul(b, gtvals[i],
- nir_build_imm(b, 1, 32, v));
- v.f32[0] = 0.055;
- gtvals[i] = nir_fsub(b, gtvals[i],
- nir_build_imm(b, 1, 32, v));
- }
-
- nir_ssa_def *comp[4];
- for (i = 0; i < 3; i++)
- comp[i] = nir_bcsel(b, cmp[i], ltvals[i], gtvals[i]);
- comp[3] = nir_channels(b, input, 3);
- return nir_vec(b, comp, 4);
-}
-