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/*
* Copyright © 2018 Red Hat Inc.
*
* 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.h"
#include "nir_builtin_builder.h"
nir_ssa_def*
nir_cross(nir_builder *b, nir_ssa_def *x, nir_ssa_def *y)
{
unsigned yzx[3] = { 1, 2, 0 };
unsigned zxy[3] = { 2, 0, 1 };
return nir_fsub(b, nir_fmul(b, nir_swizzle(b, x, yzx, 3, true),
nir_swizzle(b, y, zxy, 3, true)),
nir_fmul(b, nir_swizzle(b, x, zxy, 3, true),
nir_swizzle(b, y, yzx, 3, true)));
}
nir_ssa_def*
nir_fast_length(nir_builder *b, nir_ssa_def *vec)
{
switch (vec->num_components) {
case 1: return nir_fsqrt(b, nir_fmul(b, vec, vec));
case 2: return nir_fsqrt(b, nir_fdot2(b, vec, vec));
case 3: return nir_fsqrt(b, nir_fdot3(b, vec, vec));
case 4: return nir_fsqrt(b, nir_fdot4(b, vec, vec));
default:
unreachable("Invalid number of components");
}
}
nir_ssa_def*
nir_smoothstep(nir_builder *b, nir_ssa_def *edge0, nir_ssa_def *edge1, nir_ssa_def *x)
{
nir_ssa_def *f2 = nir_imm_floatN_t(b, 2.0, x->bit_size);
nir_ssa_def *f3 = nir_imm_floatN_t(b, 3.0, x->bit_size);
/* t = clamp((x - edge0) / (edge1 - edge0), 0, 1) */
nir_ssa_def *t =
nir_fsat(b, nir_fdiv(b, nir_fsub(b, x, edge0),
nir_fsub(b, edge1, edge0)));
/* result = t * t * (3 - 2 * t) */
return nir_fmul(b, t, nir_fmul(b, t, nir_fsub(b, f3, nir_fmul(b, f2, t))));
}
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