2083cfb6eb
also move some of the GLSL builtins over we will need for implementing
some OpenCL builtins
v2: replace NIR_IMM_FP by nir_imm_floatN_t in ported code
fix up changes caused by swizzle rework
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
66 lines
2.5 KiB
C
66 lines
2.5 KiB
C
/*
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* Copyright © 2018 Red Hat Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "nir.h"
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#include "nir_builtin_builder.h"
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nir_ssa_def*
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nir_cross(nir_builder *b, nir_ssa_def *x, nir_ssa_def *y)
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{
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unsigned yzx[3] = { 1, 2, 0 };
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unsigned zxy[3] = { 2, 0, 1 };
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return nir_fsub(b, nir_fmul(b, nir_swizzle(b, x, yzx, 3, true),
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nir_swizzle(b, y, zxy, 3, true)),
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nir_fmul(b, nir_swizzle(b, x, zxy, 3, true),
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nir_swizzle(b, y, yzx, 3, true)));
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}
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nir_ssa_def*
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nir_fast_length(nir_builder *b, nir_ssa_def *vec)
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{
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switch (vec->num_components) {
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case 1: return nir_fsqrt(b, nir_fmul(b, vec, vec));
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case 2: return nir_fsqrt(b, nir_fdot2(b, vec, vec));
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case 3: return nir_fsqrt(b, nir_fdot3(b, vec, vec));
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case 4: return nir_fsqrt(b, nir_fdot4(b, vec, vec));
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default:
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unreachable("Invalid number of components");
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}
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}
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nir_ssa_def*
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nir_smoothstep(nir_builder *b, nir_ssa_def *edge0, nir_ssa_def *edge1, nir_ssa_def *x)
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{
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nir_ssa_def *f2 = nir_imm_floatN_t(b, 2.0, x->bit_size);
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nir_ssa_def *f3 = nir_imm_floatN_t(b, 3.0, x->bit_size);
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/* t = clamp((x - edge0) / (edge1 - edge0), 0, 1) */
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nir_ssa_def *t =
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nir_fsat(b, nir_fdiv(b, nir_fsub(b, x, edge0),
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nir_fsub(b, edge1, edge0)));
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/* result = t * t * (3 - 2 * t) */
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return nir_fmul(b, t, nir_fmul(b, t, nir_fsub(b, f3, nir_fmul(b, f2, t))));
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}
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