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// Copyright 2014 Intel Corporation All Rights Reserved
//
// Intel makes no representations about the suitability of this software for any purpose.
// THIS SOFTWARE IS PROVIDED ""AS IS."" INTEL SPECIFICALLY DISCLAIMS ALL WARRANTIES,
// EXPRESS OR IMPLIED, AND ALL LIABILITY, INCLUDING CONSEQUENTIAL AND OTHER INDIRECT DAMAGES,
// FOR THE USE OF THIS SOFTWARE, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PROPRIETARY
// RIGHTS, AND INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
// Intel does not assume any responsibility for any errors which may appear in this software
// nor any responsibility to update it.
#pragma once
#include "simplexnoise1234.h"
// Very simple multi-octave simplex noise helper
// Returns noise in the range [0, 1] vs. the usual [-1, 1]
template <size_t N = 4>
class NoiseOctaves
{
private:
float mWeights[N];
float mWeightNorm;
public:
NoiseOctaves(float persistence = 0.5f)
{
float weightSum = 0.0f;
for (size_t i = 0; i < N; ++i) {
mWeights[i] = persistence;
weightSum += persistence;
persistence *= persistence;
}
mWeightNorm = 0.5f / weightSum; // Will normalize to [-0.5, 0.5]
}
// Returns [0, 1]
float operator()(float x, float y, float z) const
{
float r = 0.0f;
for (size_t i = 0; i < N; ++i) {
r += mWeights[i] * snoise3(x, y, z);
x *= 2.0f; y *= 2.0f; z *= 2.0f;
}
return r * mWeightNorm + 0.5f;
}
// Returns [0, 1]
float operator()(float x, float y, float z, float w) const
{
float r = 0.0f;
for (size_t i = 0; i < N; ++i) {
r += mWeights[i] * snoise4(x, y, z, w);
x *= 2.0f; y *= 2.0f; z *= 2.0f; w *= 2.0f;
}
return r * mWeightNorm + 0.5f;
}
};
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