Blender V4.3
node_ramp_util.h
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1/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
2 *
3 * SPDX-License-Identifier: Apache-2.0 */
4
5/* NOTE: svm_ramp.h, svm_ramp_util.h and node_ramp_util.h must stay consistent */
6
7color rgb_ramp_lookup(color ramp[], float at, int interpolate, int extrapolate)
8{
9 float f = at;
10 int table_size = arraylength(ramp);
11
12 if ((f < 0.0 || f > 1.0) && extrapolate) {
13 color t0, dy;
14 if (f < 0.0) {
15 t0 = ramp[0];
16 dy = t0 - ramp[1];
17 f = -f;
18 }
19 else {
20 t0 = ramp[table_size - 1];
21 dy = t0 - ramp[table_size - 2];
22 f = f - 1.0;
23 }
24 return t0 + dy * f * (table_size - 1);
25 }
26
27 f = clamp(at, 0.0, 1.0) * (table_size - 1);
28
29 /* clamp int as well in case of NaN */
30 int i = (int)f;
31 if (i < 0) {
32 i = 0;
33 }
34 if (i >= table_size) {
35 i = table_size - 1;
36 }
37 float t = f - (float)i;
38
39 color result = ramp[i];
40
41 if (interpolate && t > 0.0) {
42 result = (1.0 - t) * result + t * ramp[i + 1];
43 }
44
45 return result;
46}
47
48float rgb_ramp_lookup(float ramp[], float at, int interpolate, int extrapolate)
49{
50 float f = at;
51 int table_size = arraylength(ramp);
52
53 if ((f < 0.0 || f > 1.0) && extrapolate) {
54 float t0, dy;
55 if (f < 0.0) {
56 t0 = ramp[0];
57 dy = t0 - ramp[1];
58 f = -f;
59 }
60 else {
61 t0 = ramp[table_size - 1];
62 dy = t0 - ramp[table_size - 2];
63 f = f - 1.0;
64 }
65 return t0 + dy * f * (table_size - 1);
66 }
67
68 f = clamp(at, 0.0, 1.0) * (table_size - 1);
69
70 /* clamp int as well in case of NaN */
71 int i = (int)f;
72 if (i < 0) {
73 i = 0;
74 }
75 if (i >= table_size) {
76 i = table_size - 1;
77 }
78 float t = f - (float)i;
79
80 float result = ramp[i];
81
82 if (interpolate && t > 0.0) {
83 result = (1.0 - t) * result + t * ramp[i + 1];
84 }
85
86 return result;
87}
result
double result
Definition BLI_expr_pylike_eval_test.cc:351
color
Group Output data from inside of a node group A color picker Mix two input colors RGB to Convert a color s luminance to a grayscale value Generate a normal vector and a dot product Brightness Control the brightness and contrast of the input color Vector Map input vector components with curves Camera Retrieve information about the camera and how it relates to the current shading point s position Clamp a value between a minimum and a maximum Vector Perform vector math operation Invert Invert a color
Definition NOD_static_types.h:46
float
draw_view in_light_buf[] float
Definition eevee_light_culling_info.hh:42
int
draw_view push_constant(Type::INT, "radiance_src") .push_constant(Type capture_info_buf storage_buf(1, Qualifier::READ, "ObjectBounds", "bounds_buf[]") .push_constant(Type draw_view int
Definition eevee_lightprobe_volume_info.hh:143
rgb_ramp_lookup
color rgb_ramp_lookup(color ramp[], float at, int interpolate, int extrapolate)
Definition node_ramp_util.h:7
clamp
ccl_device_inline int clamp(int a, int mn, int mx)
Definition util/math.h:379
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