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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.
*/
CCL_NAMESPACE_BEGIN
/* The fractal_noise_[1-4] functions are all exactly the same except for the input type. */
ccl_device_noinline float fractal_noise_1d(float p, float octaves, float roughness)
{
float fscale = 1.0f;
float amp = 1.0f;
float maxamp = 0.0f;
float sum = 0.0f;
octaves = clamp(octaves, 0.0f, 16.0f);
int n = float_to_int(octaves);
for (int i = 0; i <= n; i++) {
float t = noise_1d(fscale * p);
sum += t * amp;
maxamp += amp;
amp *= clamp(roughness, 0.0f, 1.0f);
fscale *= 2.0f;
}
float rmd = octaves - floorf(octaves);
if (rmd != 0.0f) {
float t = noise_1d(fscale * p);
float sum2 = sum + t * amp;
sum /= maxamp;
sum2 /= maxamp + amp;
return (1.0f - rmd) * sum + rmd * sum2;
}
else {
return sum / maxamp;
}
}
/* The fractal_noise_[1-4] functions are all exactly the same except for the input type. */
ccl_device_noinline float fractal_noise_2d(float2 p, float octaves, float roughness)
{
float fscale = 1.0f;
float amp = 1.0f;
float maxamp = 0.0f;
float sum = 0.0f;
octaves = clamp(octaves, 0.0f, 16.0f);
int n = float_to_int(octaves);
for (int i = 0; i <= n; i++) {
float t = noise_2d(fscale * p);
sum += t * amp;
maxamp += amp;
amp *= clamp(roughness, 0.0f, 1.0f);
fscale *= 2.0f;
}
float rmd = octaves - floorf(octaves);
if (rmd != 0.0f) {
float t = noise_2d(fscale * p);
float sum2 = sum + t * amp;
sum /= maxamp;
sum2 /= maxamp + amp;
return (1.0f - rmd) * sum + rmd * sum2;
}
else {
return sum / maxamp;
}
}
/* The fractal_noise_[1-4] functions are all exactly the same except for the input type. */
ccl_device_noinline float fractal_noise_3d(float3 p, float octaves, float roughness)
{
float fscale = 1.0f;
float amp = 1.0f;
float maxamp = 0.0f;
float sum = 0.0f;
octaves = clamp(octaves, 0.0f, 16.0f);
int n = float_to_int(octaves);
for (int i = 0; i <= n; i++) {
float t = noise_3d(fscale * p);
sum += t * amp;
maxamp += amp;
amp *= clamp(roughness, 0.0f, 1.0f);
fscale *= 2.0f;
}
float rmd = octaves - floorf(octaves);
if (rmd != 0.0f) {
float t = noise_3d(fscale * p);
float sum2 = sum + t * amp;
sum /= maxamp;
sum2 /= maxamp + amp;
return (1.0f - rmd) * sum + rmd * sum2;
}
else {
return sum / maxamp;
}
}
/* The fractal_noise_[1-4] functions are all exactly the same except for the input type. */
ccl_device_noinline float fractal_noise_4d(float4 p, float octaves, float roughness)
{
float fscale = 1.0f;
float amp = 1.0f;
float maxamp = 0.0f;
float sum = 0.0f;
octaves = clamp(octaves, 0.0f, 16.0f);
int n = float_to_int(octaves);
for (int i = 0; i <= n; i++) {
float t = noise_4d(fscale * p);
sum += t * amp;
maxamp += amp;
amp *= clamp(roughness, 0.0f, 1.0f);
fscale *= 2.0f;
}
float rmd = octaves - floorf(octaves);
if (rmd != 0.0f) {
float t = noise_4d(fscale * p);
float sum2 = sum + t * amp;
sum /= maxamp;
sum2 /= maxamp + amp;
return (1.0f - rmd) * sum + rmd * sum2;
}
else {
return sum / maxamp;
}
}
CCL_NAMESPACE_END
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