node_noise.h

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/*
 * Copyright 2011-2013 Blender Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#include "vector2.h"
#include "vector4.h"
 
#define vector3 point
 
float safe_noise(float p)
{
  float f = noise("noise", p);
  if (isinf(f))
    return 0.5;
  return f;
}
 
float safe_noise(vector2 p)
{
  float f = noise("noise", p.x, p.y);
  if (isinf(f))
    return 0.5;
  return f;
}
 
float safe_noise(vector3 p)
{
  float f = noise("noise", p);
  if (isinf(f))
    return 0.5;
  return f;
}
 
float safe_noise(vector4 p)
{
  float f = noise("noise", vector3(p.x, p.y, p.z), p.w);
  if (isinf(f))
    return 0.5;
  return f;
}
 
float safe_snoise(float p)
{
  float f = noise("snoise", p);
  if (isinf(f))
    return 0.0;
  return f;
}
 
float safe_snoise(vector2 p)
{
  float f = noise("snoise", p.x, p.y);
  if (isinf(f))
    return 0.0;
  return f;
}
 
float safe_snoise(vector3 p)
{
  float f = noise("snoise", p);
  if (isinf(f))
    return 0.0;
  return f;
}
 
float safe_snoise(vector4 p)
{
  float f = noise("snoise", vector3(p.x, p.y, p.z), p.w);
  if (isinf(f))
    return 0.0;
  return f;
}
 
/* The fractal_noise functions are all exactly the same except for the input type. */
float fractal_noise(float p, float details, float roughness)
{
  float fscale = 1.0;
  float amp = 1.0;
  float maxamp = 0.0;
  float sum = 0.0;
  float octaves = clamp(details, 0.0, 16.0);
  int n = (int)octaves;
  for (int i = 0; i <= n; i++) {
    float t = safe_noise(fscale * p);
    sum += t * amp;
    maxamp += amp;
    amp *= clamp(roughness, 0.0, 1.0);
    fscale *= 2.0;
  }
  float rmd = octaves - floor(octaves);
  if (rmd != 0.0) {
    float t = safe_noise(fscale * p);
    float sum2 = sum + t * amp;
    sum /= maxamp;
    sum2 /= maxamp + amp;
    return (1.0 - rmd) * sum + rmd * sum2;
  }
  else {
    return sum / maxamp;
  }
}
 
/* The fractal_noise functions are all exactly the same except for the input type. */
float fractal_noise(vector2 p, float details, float roughness)
{
  float fscale = 1.0;
  float amp = 1.0;
  float maxamp = 0.0;
  float sum = 0.0;
  float octaves = clamp(details, 0.0, 16.0);
  int n = (int)octaves;
  for (int i = 0; i <= n; i++) {
    float t = safe_noise(fscale * p);
    sum += t * amp;
    maxamp += amp;
    amp *= clamp(roughness, 0.0, 1.0);
    fscale *= 2.0;
  }
  float rmd = octaves - floor(octaves);
  if (rmd != 0.0) {
    float t = safe_noise(fscale * p);
    float sum2 = sum + t * amp;
    sum /= maxamp;
    sum2 /= maxamp + amp;
    return (1.0 - rmd) * sum + rmd * sum2;
  }
  else {
    return sum / maxamp;
  }
}
 
/* The fractal_noise functions are all exactly the same except for the input type. */
float fractal_noise(vector3 p, float details, float roughness)
{
  float fscale = 1.0;
  float amp = 1.0;
  float maxamp = 0.0;
  float sum = 0.0;
  float octaves = clamp(details, 0.0, 16.0);
  int n = (int)octaves;
  for (int i = 0; i <= n; i++) {
    float t = safe_noise(fscale * p);
    sum += t * amp;
    maxamp += amp;
    amp *= clamp(roughness, 0.0, 1.0);
    fscale *= 2.0;
  }
  float rmd = octaves - floor(octaves);
  if (rmd != 0.0) {
    float t = safe_noise(fscale * p);
    float sum2 = sum + t * amp;
    sum /= maxamp;
    sum2 /= maxamp + amp;
    return (1.0 - rmd) * sum + rmd * sum2;
  }
  else {
    return sum / maxamp;
  }
}
 
/* The fractal_noise functions are all exactly the same except for the input type. */
float fractal_noise(vector4 p, float details, float roughness)
{
  float fscale = 1.0;
  float amp = 1.0;
  float maxamp = 0.0;
  float sum = 0.0;
  float octaves = clamp(details, 0.0, 16.0);
  int n = (int)octaves;
  for (int i = 0; i <= n; i++) {
    float t = safe_noise(fscale * p);
    sum += t * amp;
    maxamp += amp;
    amp *= clamp(roughness, 0.0, 1.0);
    fscale *= 2.0;
  }
  float rmd = octaves - floor(octaves);
  if (rmd != 0.0) {
    float t = safe_noise(fscale * p);
    float sum2 = sum + t * amp;
    sum /= maxamp;
    sum2 /= maxamp + amp;
    return (1.0 - rmd) * sum + rmd * sum2;
  }
  else {
    return sum / maxamp;
  }
}
 
#undef vector3