TG101/Reverb.h at main · TaleTN/TG101 · GitHub

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// Copyright (C) 2025, 2026 Theo Niessink <theo@taletn.com>
// This work is free. You can redistribute it and/or modify it under the
// terms of the Do What The Fuck You Want To Public License, Version 2,
// as published by Sam Hocevar. See http://www.wtfpl.net/ for more details.

#pragma once

#include "System.h"
#include "WDL/wdltypes.h"

namespace TG101 {

class Reverb
{
public:
	Reverb();
	~Reverb();

	void SetSampleRate(double sampleRate);

	void SetReverbType(EReverbType type);
	void SetReverbFeedback(const unsigned short coeff[4][2], int num = 4);
	void SetOutputLevel(int level);

	inline void MuteOutput() { mOutputLevel = 0.0f; }

	void Reset();
	void Process(float input, float output[2]);

	#ifndef NDEBUG
	void ExtractIR(const char* filename, int maxLen = 0);
	#endif

private:
	struct DelayLine
	{
		int mIdx, mLen;
	};

	struct CombFilter
	{
		DelayLine mDelay;
		int mTap[2];

		float mFeedback, mGain;
		double WDL_FIXALIGN mFilterState;
	}
	WDL_FIXALIGN;

	int SetDiffuserType(int type, double ratio);
	int SetCombFilterType(int type, double ratio);

	static double GetLowPassCoeff(double cutoff, double ratio);

	float* ProcessDelayLine(float input, float* output, DelayLine* delay, float* buf);

	float* ProcessReverb(float input, float output[2], int type, float* buf);
	float* ProcessDelay(float input, float output[2], int type, float* buf);

	float* ProcessEarlyReflect(float input, float output[3], int type, float* buf);
	float* ProcessDelayFeedback(float input, float output[2], const float coeff[2], float* buf);

	static float ProcessLowPassFilter(float input, double* state, double coeff);

	static float* ProcessDiffuser(float input, float* output, DelayLine* diff, float* buf, const float coeff[4]);
	static float* ProcessCombFilter(float input, float output[2], CombFilter* comb, float* buf, double damp);

	int mReverbType, mBufSize;
	float* mBuf;

	DelayLine mLatency;

	DelayLine mDelay;
	int mDelayTap[2];

	DelayLine mPreDelay;

	double WDL_FIXALIGN mLowPassState, mLowPassCoeff[2];
	DelayLine mInputDiff[2];

	double WDL_FIXALIGN mHighDamp;
	CombFilter mComb[4];

	DelayLine mOutputDiff[2];
	float mOutputLevel;

	double WDL_FIXALIGN mSampleRatio;

	static const double mNativeSampleRate;
	static const unsigned short mMaxDelayTbl[9];
	static const unsigned short mERDelayTbl[8][3];
	static const float mERGainTbl[3][4];
	static const float mDelayFeedbackTbl[2][2];
	static const double mLowPassCutoffTbl[2];
	static const unsigned short mDiffDelayTbl[3][4];
	static const float mDiffCoeffTbl[4][4];
	static const double mCombDampTbl[6];
	static const unsigned short mCombDelayTbl[3][4][3];
	static const unsigned short mDampCutoffTbl[6];
	static const float mCombFeedbackTbl[6];
	static const float mDelayMixTbl[2][4];
	static const unsigned char mOutputLevelTbl[13];
}
WDL_FIXALIGN;

} // namespace TG101