Blender  V3.3
math_cdf.cpp
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1 /* SPDX-License-Identifier: Apache-2.0
2  * Copyright 2011-2022 Blender Foundation */
3 
4 #include "util/math_cdf.h"
5 
6 #include "util/algorithm.h"
7 #include "util/math.h"
8 
10 
11 /* Invert pre-calculated CDF function. */
12 void util_cdf_invert(const int resolution,
13  const float from,
14  const float to,
15  const vector<float> &cdf,
16  const bool make_symmetric,
17  vector<float> &inv_cdf)
18 {
19  const float inv_resolution = 1.0f / (float)resolution;
20  const float range = to - from;
21  inv_cdf.resize(resolution);
22  if (make_symmetric) {
23  const int half_size = (resolution - 1) / 2;
24  for (int i = 0; i <= half_size; i++) {
25  float x = i / (float)half_size;
26  int index = upper_bound(cdf.begin(), cdf.end(), x) - cdf.begin();
27  float t;
28  if (index < cdf.size() - 1) {
29  t = (x - cdf[index]) / (cdf[index + 1] - cdf[index]);
30  }
31  else {
32  t = 0.0f;
33  index = cdf.size() - 1;
34  }
35  float y = ((index + t) / (resolution - 1)) * (2.0f * range);
36  inv_cdf[half_size + i] = 0.5f * (1.0f + y);
37  inv_cdf[half_size - i] = 0.5f * (1.0f - y);
38  }
39  }
40  else {
41  for (int i = 0; i < resolution; i++) {
42  float x = from + range * (float)i * inv_resolution;
43  int index = upper_bound(cdf.begin(), cdf.end(), x) - cdf.begin();
44  float t;
45  if (index < cdf.size() - 1) {
46  t = (x - cdf[index]) / (cdf[index + 1] - cdf[index]);
47  }
48  else {
49  t = 0.0f;
50  index = resolution;
51  }
52  inv_cdf[i] = (index + t) * inv_resolution;
53  }
54  }
55 }
56 
typedef float(TangentPoint)[2]
_GL_VOID GLfloat value _GL_VOID_RET _GL_VOID const GLuint GLboolean *residences _GL_BOOL_RET _GL_VOID GLsizei GLfloat GLfloat GLfloat GLfloat const GLubyte *bitmap _GL_VOID_RET _GL_VOID GLenum const void *lists _GL_VOID_RET _GL_VOID const GLdouble *equation _GL_VOID_RET _GL_VOID GLdouble GLdouble blue _GL_VOID_RET _GL_VOID GLfloat GLfloat blue _GL_VOID_RET _GL_VOID GLint GLint blue _GL_VOID_RET _GL_VOID GLshort GLshort blue _GL_VOID_RET _GL_VOID GLubyte GLubyte blue _GL_VOID_RET _GL_VOID GLuint GLuint blue _GL_VOID_RET _GL_VOID GLushort GLushort blue _GL_VOID_RET _GL_VOID GLbyte GLbyte GLbyte alpha _GL_VOID_RET _GL_VOID GLdouble GLdouble GLdouble alpha _GL_VOID_RET _GL_VOID GLfloat GLfloat GLfloat alpha _GL_VOID_RET _GL_VOID GLint GLint GLint alpha _GL_VOID_RET _GL_VOID GLshort GLshort GLshort alpha _GL_VOID_RET _GL_VOID GLubyte GLubyte GLubyte alpha _GL_VOID_RET _GL_VOID GLuint GLuint GLuint alpha _GL_VOID_RET _GL_VOID GLushort GLushort GLushort alpha _GL_VOID_RET _GL_VOID GLenum mode _GL_VOID_RET _GL_VOID GLint y
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#define CCL_NAMESPACE_END
Definition: cuda/compat.h:9
StackEntry * from
CCL_NAMESPACE_BEGIN void util_cdf_invert(const int resolution, const float from, const float to, const vector< float > &cdf, const bool make_symmetric, vector< float > &inv_cdf)
Definition: math_cdf.cpp:12