nir_builtin_builder.c revision 01e04c3f 
1/*
2 * Copyright © 2018 Red Hat Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 */
23
24#include "nir.h"
25#include "nir_builtin_builder.h"
26
27nir_ssa_def*
28nir_cross(nir_builder *b, nir_ssa_def *x, nir_ssa_def *y)
29{
30   unsigned yzx[3] = { 1, 2, 0 };
31   unsigned zxy[3] = { 2, 0, 1 };
32
33   return nir_fsub(b, nir_fmul(b, nir_swizzle(b, x, yzx, 3, true),
34                                  nir_swizzle(b, y, zxy, 3, true)),
35                      nir_fmul(b, nir_swizzle(b, x, zxy, 3, true),
36                                  nir_swizzle(b, y, yzx, 3, true)));
37}
38
39nir_ssa_def*
40nir_fast_length(nir_builder *b, nir_ssa_def *vec)
41{
42   switch (vec->num_components) {
43   case 1: return nir_fsqrt(b, nir_fmul(b, vec, vec));
44   case 2: return nir_fsqrt(b, nir_fdot2(b, vec, vec));
45   case 3: return nir_fsqrt(b, nir_fdot3(b, vec, vec));
46   case 4: return nir_fsqrt(b, nir_fdot4(b, vec, vec));
47   default:
48      unreachable("Invalid number of components");
49   }
50}
51
52nir_ssa_def*
53nir_smoothstep(nir_builder *b, nir_ssa_def *edge0, nir_ssa_def *edge1, nir_ssa_def *x)
54{
55   nir_ssa_def *f2 = nir_imm_floatN_t(b, 2.0, x->bit_size);
56   nir_ssa_def *f3 = nir_imm_floatN_t(b, 3.0, x->bit_size);
57
58   /* t = clamp((x - edge0) / (edge1 - edge0), 0, 1) */
59   nir_ssa_def *t =
60      nir_fsat(b, nir_fdiv(b, nir_fsub(b, x, edge0),
61                              nir_fsub(b, edge1, edge0)));
62
63   /* result = t * t * (3 - 2 * t) */
64   return nir_fmul(b, t, nir_fmul(b, t, nir_fsub(b, f3, nir_fmul(b, f2, t))));
65}
66