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/*
* Copyright © 2017 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "nir_builder.h"
#include "util/format_rgb9e5.h"
static inline nir_ssa_def *
nir_shift(nir_builder *b, nir_ssa_def *value, int left_shift)
{
if (left_shift > 0)
return nir_ishl(b, value, nir_imm_int(b, left_shift));
else if (left_shift < 0)
return nir_ushr(b, value, nir_imm_int(b, -left_shift));
else
return value;
}
static inline nir_ssa_def *
nir_mask_shift(struct nir_builder *b, nir_ssa_def *src,
uint32_t mask, int left_shift)
{
return nir_shift(b, nir_iand(b, src, nir_imm_int(b, mask)), left_shift);
}
static inline nir_ssa_def *
nir_mask_shift_or(struct nir_builder *b, nir_ssa_def *dst, nir_ssa_def *src,
uint32_t src_mask, int src_left_shift)
{
return nir_ior(b, nir_mask_shift(b, src, src_mask, src_left_shift), dst);
}
static inline nir_ssa_def *
nir_format_mask_uvec(nir_builder *b, nir_ssa_def *src, const unsigned *bits)
{
nir_const_value mask;
for (unsigned i = 0; i < src->num_components; i++) {
assert(bits[i] < 32);
mask.u32[i] = (1u << bits[i]) - 1;
}
return nir_iand(b, src, nir_build_imm(b, src->num_components, 32, mask));
}
static inline nir_ssa_def *
nir_format_sign_extend_ivec(nir_builder *b, nir_ssa_def *src,
const unsigned *bits)
{
assert(src->num_components <= 4);
nir_ssa_def *comps[4];
for (unsigned i = 0; i < src->num_components; i++) {
nir_ssa_def *shift = nir_imm_int(b, src->bit_size - bits[i]);
comps[i] = nir_ishr(b, nir_ishl(b, nir_channel(b, src, i), shift), shift);
}
return nir_vec(b, comps, src->num_components);
}
static inline nir_ssa_def *
nir_format_unpack_int(nir_builder *b, nir_ssa_def *packed,
const unsigned *bits, unsigned num_components,
bool sign_extend)
{
assert(num_components >= 1 && num_components <= 4);
const unsigned bit_size = packed->bit_size;
nir_ssa_def *comps[4];
if (bits[0] >= bit_size) {
assert(bits[0] == bit_size);
assert(num_components == 1);
return packed;
}
unsigned next_chan = 0;
unsigned offset = 0;
for (unsigned i = 0; i < num_components; i++) {
assert(bits[i] < bit_size);
assert(offset + bits[i] <= bit_size);
nir_ssa_def *chan = nir_channel(b, packed, next_chan);
nir_ssa_def *lshift = nir_imm_int(b, bit_size - (offset + bits[i]));
nir_ssa_def *rshift = nir_imm_int(b, bit_size - bits[i]);
if (sign_extend)
comps[i] = nir_ishr(b, nir_ishl(b, chan, lshift), rshift);
else
comps[i] = nir_ushr(b, nir_ishl(b, chan, lshift), rshift);
offset += bits[i];
if (offset >= bit_size) {
next_chan++;
offset -= bit_size;
}
}
return nir_vec(b, comps, num_components);
}
static inline nir_ssa_def *
nir_format_unpack_uint(nir_builder *b, nir_ssa_def *packed,
const unsigned *bits, unsigned num_components)
{
return nir_format_unpack_int(b, packed, bits, num_components, false);
}
static inline nir_ssa_def *
nir_format_unpack_sint(nir_builder *b, nir_ssa_def *packed,
const unsigned *bits, unsigned num_components)
{
return nir_format_unpack_int(b, packed, bits, num_components, true);
}
static inline nir_ssa_def *
nir_format_pack_uint_unmasked(nir_builder *b, nir_ssa_def *color,
const unsigned *bits, unsigned num_components)
{
assert(num_components >= 1 && num_components <= 4);
nir_ssa_def *packed = nir_imm_int(b, 0);
unsigned offset = 0;
for (unsigned i = 0; i < num_components; i++) {
packed = nir_ior(b, packed, nir_shift(b, nir_channel(b, color, i),
offset));
offset += bits[i];
}
assert(offset <= packed->bit_size);
return packed;
}
static inline nir_ssa_def *
nir_format_pack_uint(nir_builder *b, nir_ssa_def *color,
const unsigned *bits, unsigned num_components)
{
return nir_format_pack_uint_unmasked(b, nir_format_mask_uvec(b, color, bits),
bits, num_components);
}
static inline nir_ssa_def *
nir_format_bitcast_uvec_unmasked(nir_builder *b, nir_ssa_def *src,
unsigned src_bits, unsigned dst_bits)
{
assert(src->bit_size >= src_bits && src->bit_size >= dst_bits);
assert(src_bits == 8 || src_bits == 16 || src_bits == 32);
assert(dst_bits == 8 || dst_bits == 16 || dst_bits == 32);
if (src_bits == dst_bits)
return src;
const unsigned dst_components =
DIV_ROUND_UP(src->num_components * src_bits, dst_bits);
assert(dst_components <= 4);
nir_ssa_def *dst_chan[4] = {0};
if (dst_bits > src_bits) {
unsigned shift = 0;
unsigned dst_idx = 0;
for (unsigned i = 0; i < src->num_components; i++) {
nir_ssa_def *shifted = nir_ishl(b, nir_channel(b, src, i),
nir_imm_int(b, shift));
if (shift == 0) {
dst_chan[dst_idx] = shifted;
} else {
dst_chan[dst_idx] = nir_ior(b, dst_chan[dst_idx], shifted);
}
shift += src_bits;
if (shift >= dst_bits) {
dst_idx++;
shift = 0;
}
}
} else {
nir_ssa_def *mask = nir_imm_int(b, ~0u >> (32 - dst_bits));
unsigned src_idx = 0;
unsigned shift = 0;
for (unsigned i = 0; i < dst_components; i++) {
dst_chan[i] = nir_iand(b, nir_ushr(b, nir_channel(b, src, src_idx),
nir_imm_int(b, shift)),
mask);
shift += dst_bits;
if (shift >= src_bits) {
src_idx++;
shift = 0;
}
}
}
return nir_vec(b, dst_chan, dst_components);
}
static inline nir_ssa_def *
_nir_format_norm_factor(nir_builder *b, const 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, const 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, const 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, const 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, const 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)));
}
/* Converts a vector of floats to a vector of half-floats packed in the low 16
* bits.
*/
static inline nir_ssa_def *
nir_format_float_to_half(nir_builder *b, nir_ssa_def *f)
{
nir_ssa_def *zero = nir_imm_float(b, 0);
nir_ssa_def *f16comps[4];
for (unsigned i = 0; i < f->num_components; i++)
f16comps[i] = nir_pack_half_2x16_split(b, nir_channel(b, f, i), zero);
return nir_vec(b, f16comps, f->num_components);
}
static inline nir_ssa_def *
nir_format_linear_to_srgb(nir_builder *b, nir_ssa_def *c)
{
nir_ssa_def *linear = nir_fmul(b, c, nir_imm_float(b, 12.92f));
nir_ssa_def *curved =
nir_fsub(b, nir_fmul(b, nir_imm_float(b, 1.055f),
nir_fpow(b, c, nir_imm_float(b, 1.0 / 2.4))),
nir_imm_float(b, 0.055f));
return nir_fsat(b, nir_bcsel(b, nir_flt(b, c, nir_imm_float(b, 0.0031308f)),
linear, curved));
}
static inline nir_ssa_def *
nir_format_srgb_to_linear(nir_builder *b, nir_ssa_def *c)
{
nir_ssa_def *linear = nir_fdiv(b, c, nir_imm_float(b, 12.92f));
nir_ssa_def *curved =
nir_fpow(b, nir_fdiv(b, nir_fadd(b, c, nir_imm_float(b, 0.055f)),
nir_imm_float(b, 1.055f)),
nir_imm_float(b, 2.4f));
return nir_fsat(b, nir_bcsel(b, nir_fge(b, nir_imm_float(b, 0.04045f), c),
linear, curved));
}
/* Clamps a vector of uints so they don't extend beyond the given number of
* bits per channel.
*/
static inline nir_ssa_def *
nir_format_clamp_uint(nir_builder *b, nir_ssa_def *f, const unsigned *bits)
{
if (bits[0] == 32)
return f;
nir_const_value max;
for (unsigned i = 0; i < f->num_components; i++) {
assert(bits[i] < 32);
max.u32[i] = (1 << bits[i]) - 1;
}
return nir_umin(b, f, nir_build_imm(b, f->num_components, 32, max));
}
/* Clamps a vector of sints so they don't extend beyond the given number of
* bits per channel.
*/
static inline nir_ssa_def *
nir_format_clamp_sint(nir_builder *b, nir_ssa_def *f, const unsigned *bits)
{
if (bits[0] == 32)
return f;
nir_const_value min, max;
for (unsigned i = 0; i < f->num_components; i++) {
assert(bits[i] < 32);
max.i32[i] = (1 << (bits[i] - 1)) - 1;
min.i32[i] = -(1 << (bits[i] - 1));
}
f = nir_imin(b, f, nir_build_imm(b, f->num_components, 32, max));
f = nir_imax(b, f, nir_build_imm(b, f->num_components, 32, min));
return f;
}
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, 0x003ff800, -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_11f11f10f(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;
}
static inline nir_ssa_def *
nir_format_pack_r9g9b9e5(nir_builder *b, nir_ssa_def *color)
{
/* See also float3_to_rgb9e5 */
/* First, we need to clamp it to range. */
nir_ssa_def *clamped = nir_fmin(b, color, nir_imm_float(b, MAX_RGB9E5));
/* Get rid of negatives and NaN */
clamped = nir_bcsel(b, nir_ult(b, nir_imm_int(b, 0x7f800000), color),
nir_imm_float(b, 0), clamped);
/* maxrgb.u = MAX3(rc.u, gc.u, bc.u); */
nir_ssa_def *maxu = nir_umax(b, nir_channel(b, clamped, 0),
nir_umax(b, nir_channel(b, clamped, 1),
nir_channel(b, clamped, 2)));
/* maxrgb.u += maxrgb.u & (1 << (23-9)); */
maxu = nir_iadd(b, maxu, nir_iand(b, maxu, nir_imm_int(b, 1 << 14)));
/* exp_shared = MAX2((maxrgb.u >> 23), -RGB9E5_EXP_BIAS - 1 + 127) +
* 1 + RGB9E5_EXP_BIAS - 127;
*/
nir_ssa_def *exp_shared =
nir_iadd(b, nir_umax(b, nir_ushr(b, maxu, nir_imm_int(b, 23)),
nir_imm_int(b, -RGB9E5_EXP_BIAS - 1 + 127)),
nir_imm_int(b, 1 + RGB9E5_EXP_BIAS - 127));
/* revdenom_biasedexp = 127 - (exp_shared - RGB9E5_EXP_BIAS -
* RGB9E5_MANTISSA_BITS) + 1;
*/
nir_ssa_def *revdenom_biasedexp =
nir_isub(b, nir_imm_int(b, 127 + RGB9E5_EXP_BIAS +
RGB9E5_MANTISSA_BITS + 1),
exp_shared);
/* revdenom.u = revdenom_biasedexp << 23; */
nir_ssa_def *revdenom =
nir_ishl(b, revdenom_biasedexp, nir_imm_int(b, 23));
/* rm = (int) (rc.f * revdenom.f);
* gm = (int) (gc.f * revdenom.f);
* bm = (int) (bc.f * revdenom.f);
*/
nir_ssa_def *mantissa =
nir_f2i32(b, nir_fmul(b, clamped, revdenom));
/* rm = (rm & 1) + (rm >> 1);
* gm = (gm & 1) + (gm >> 1);
* bm = (bm & 1) + (bm >> 1);
*/
mantissa = nir_iadd(b, nir_iand(b, mantissa, nir_imm_int(b, 1)),
nir_ushr(b, mantissa, nir_imm_int(b, 1)));
nir_ssa_def *packed = nir_channel(b, mantissa, 0);
packed = nir_mask_shift_or(b, packed, nir_channel(b, mantissa, 1), ~0, 9);
packed = nir_mask_shift_or(b, packed, nir_channel(b, mantissa, 2), ~0, 18);
packed = nir_mask_shift_or(b, packed, exp_shared, ~0, 27);
return packed;
}
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