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nir/format_convert: Add [us]norm conversion helpers

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Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Jason Ekstrand
2018-08-13 16:13:50 -05:00
parent 152fdeddbb
commit 7bd0363d6f
1 changed files with 56 additions and 0 deletions
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56
src/compiler/nir/nir_format_convert.h
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@@ -201,6 +201,62 @@ nir_format_bitcast_uvec_unmasked(nir_builder *b, nir_ssa_def *src,
return nir_vec(b, dst_chan, dst_components);
}
static inline nir_ssa_def *
_nir_format_norm_factor(nir_builder *b, unsigned *bits,
unsigned num_components,
bool is_signed)
{
nir_const_value factor;
for (unsigned i = 0; i < num_components; i++) {
assert(bits[i] < 32);
factor.f32[i] = (1ul << (bits[i] - is_signed)) - 1;
}
return nir_build_imm(b, num_components, 32, factor);
}
static inline nir_ssa_def *
nir_format_unorm_to_float(nir_builder *b, nir_ssa_def *u, unsigned *bits)
{
nir_ssa_def *factor =
_nir_format_norm_factor(b, bits, u->num_components, false);
return nir_fdiv(b, nir_u2f32(b, u), factor);
}
static inline nir_ssa_def *
nir_format_snorm_to_float(nir_builder *b, nir_ssa_def *s, unsigned *bits)
{
nir_ssa_def *factor =
_nir_format_norm_factor(b, bits, s->num_components, true);
return nir_fmax(b, nir_fdiv(b, nir_i2f32(b, s), factor),
nir_imm_float(b, -1.0f));
}
static inline nir_ssa_def *
nir_format_float_to_unorm(nir_builder *b, nir_ssa_def *f, unsigned *bits)
{
nir_ssa_def *factor =
_nir_format_norm_factor(b, bits, f->num_components, false);
/* Clamp to the range [0, 1] */
f = nir_fsat(b, f);
return nir_f2u32(b, nir_fround_even(b, nir_fmul(b, f, factor)));
}
static inline nir_ssa_def *
nir_format_float_to_snorm(nir_builder *b, nir_ssa_def *f, unsigned *bits)
{
nir_ssa_def *factor =
_nir_format_norm_factor(b, bits, f->num_components, true);
/* Clamp to the range [-1, 1] */
f = nir_fmin(b, nir_fmax(b, f, nir_imm_float(b, -1)), nir_imm_float(b, 1));
return nir_f2i32(b, nir_fround_even(b, nir_fmul(b, f, factor)));
}
static inline nir_ssa_def *
nir_format_linear_to_srgb(nir_builder *b, nir_ssa_def *c)
{