From 7bd0363d6fdc7594273e6ef8a6dbd5bd9eb89856 Mon Sep 17 00:00:00 2001 From: Jason Ekstrand Date: Mon, 13 Aug 2018 16:13:50 -0500 Subject: [PATCH] nir/format_convert: Add [us]norm conversion helpers Reviewed-by: Kenneth Graunke --- src/compiler/nir/nir_format_convert.h | 56 +++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) diff --git a/src/compiler/nir/nir_format_convert.h b/src/compiler/nir/nir_format_convert.h index f2eafcbf5b4..d01cbfaa267 100644 --- a/src/compiler/nir/nir_format_convert.h +++ b/src/compiler/nir/nir_format_convert.h @@ -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) { -- 2.30.2