37 lines
773 B
C++
37 lines
773 B
C++
#include "NoiseOscillator.h"
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namespace serum
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{
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void NoiseOscillator::reset()
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{
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pinkB0 = pinkB1 = pinkB2 = 0.0f;
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}
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void NoiseOscillator::noteOn (juce::uint32 seed)
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{
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rng.setSeed (seed);
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}
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void NoiseOscillator::processAdd (int type, float level, float& out) noexcept
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{
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if (level <= 0.0f)
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return;
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const float white = rng.nextFloat() * 2.0f - 1.0f;
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float s = white;
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if (type == (int) NoiseType::Pink)
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{
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// Paul Kellet's economy pink-noise filter.
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pinkB0 = 0.99765f * pinkB0 + white * 0.0990460f;
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pinkB1 = 0.96300f * pinkB1 + white * 0.2965164f;
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pinkB2 = 0.57000f * pinkB2 + white * 1.0526913f;
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s = pinkB0 + pinkB1 + pinkB2 + white * 0.1848f;
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}
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out += s * level;
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}
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} // namespace serum
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