/* ========================================
 *  DubCenter - DubCenter.h
 *  Copyright (c) 2016 airwindows, Airwindows uses the MIT license
 * ======================================== */

#include "DubCenter.h"

#ifdef SHR3D_SFX_CORE_AIRWINDOWS

namespace airwinconsolidated::DubCenter {

void DubCenter::processBlock(float **inputs, float **outputs, int sampleFrames) 
{
    float* in1  =  inputs[0];
    float* in2  =  inputs[1];
    float* out1 = outputs[0];
    float* out2 = outputs[1];

	double overallscale = 1.0;
	overallscale /= 44100.0;
	overallscale *= getSampleRate();

	double driveone = pow(A*3.0,2);
	double driveoutput = (B*2.0)-1.0;
	double iirAmount = ((C*0.33)+0.1)/overallscale;
	double ataLowpassL;
	double ataLowpassR;
	double ataLowpass;
	double randy;
	double invrandy;
	double HeadBump = 0.0;
	double BassGain = D * 0.1;
	double HeadBumpFreq = ((E*0.1)+0.0001)/overallscale;
	double iirBmount = HeadBumpFreq/44.1;
	double altBmount = 1.0 - iirBmount;
	double BassOutGain = (F*2.0)-1.0;
	double SubBump = 0.0;
	double SubGain = G * 0.1;
	double SubBumpFreq = ((H*0.1)+0.0001)/overallscale;
	double iirCmount = SubBumpFreq/44.1;
	double altCmount = 1.0 - iirCmount;
	double SubOutGain = (I*2.0)-1.0;
	double clamp = 0.0;
	double out;
	double fuzz = 0.111;
	double wet = J;
	double glitch = 0.60;
	double tempSample;
	
    
    while (--sampleFrames >= 0)
    {
		double inputSampleL = *in1;
		double inputSampleR = *in2;

		if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpdL * 1.18e-17;
		if (fabs(inputSampleR)<1.18e-23) inputSampleR = fpdR * 1.18e-17;
		double drySampleL = inputSampleL;
		double drySampleR = inputSampleR;
		
		// here's the plan.
		// Grind Boost
		// Grind Output Level
		// Bass Split Freq
		// Bass Drive
		// Bass Voicing
		// Bass Output Level
		// Sub Oct Drive
		// Sub Voicing
		// Sub Output Level
		// Dry/Wet
		
		oscGate += fabs((inputSampleL + inputSampleR) * 5.0);
		oscGate -= 0.001;
		if (oscGate > 1.0) oscGate = 1.0;
		if (oscGate < 0) oscGate = 0;
		//got a value that only goes down low when there's silence or near silence on input
		clamp = 1.0-oscGate;
		clamp *= 0.00001;
		//set up the thing to choke off oscillations- belt and suspenders affair
		
		
		if (flip)
		{
			tempSample = inputSampleL;
			iirDriveSampleAL = (iirDriveSampleAL * (1 - iirAmount)) + (inputSampleL * iirAmount);
			inputSampleL -= iirDriveSampleAL;
			iirDriveSampleCL = (iirDriveSampleCL * (1 - iirAmount)) + (inputSampleL * iirAmount);
			inputSampleL -= iirDriveSampleCL;
			iirDriveSampleEL = (iirDriveSampleEL * (1 - iirAmount)) + (inputSampleL * iirAmount);
			inputSampleL -= iirDriveSampleEL;
			ataLowpassL = tempSample - inputSampleL;
			
			tempSample = inputSampleR;
			iirDriveSampleAR = (iirDriveSampleAR * (1 - iirAmount)) + (inputSampleR * iirAmount);
			inputSampleR -= iirDriveSampleAR;
			iirDriveSampleCR = (iirDriveSampleCR * (1 - iirAmount)) + (inputSampleR * iirAmount);
			inputSampleR -= iirDriveSampleCR;
			iirDriveSampleER = (iirDriveSampleER * (1 - iirAmount)) + (inputSampleR * iirAmount);
			inputSampleR -= iirDriveSampleER;
			ataLowpassR = tempSample - inputSampleR;
		}
		else
		{
			tempSample = inputSampleL;
			iirDriveSampleBL = (iirDriveSampleBL * (1 - iirAmount)) + (inputSampleL * iirAmount);
			inputSampleL -= iirDriveSampleBL;
			iirDriveSampleDL = (iirDriveSampleDL * (1 - iirAmount)) + (inputSampleL * iirAmount);
			inputSampleL -= iirDriveSampleDL;
			iirDriveSampleFL = (iirDriveSampleFL * (1 - iirAmount)) + (inputSampleL * iirAmount);
			inputSampleL -= iirDriveSampleFL;
			ataLowpassL = tempSample - inputSampleL;
			
			tempSample = inputSampleR;
			iirDriveSampleBR = (iirDriveSampleBR * (1 - iirAmount)) + (inputSampleR * iirAmount);
			inputSampleR -= iirDriveSampleBR;
			iirDriveSampleDR = (iirDriveSampleDR * (1 - iirAmount)) + (inputSampleR * iirAmount);
			inputSampleR -= iirDriveSampleDR;
			iirDriveSampleFR = (iirDriveSampleFR * (1 - iirAmount)) + (inputSampleR * iirAmount);
			inputSampleR -= iirDriveSampleFR;
			ataLowpassR = tempSample - inputSampleR;
		}
		//highpass section
		
		if (inputSampleL > 1.0) {inputSampleL = 1.0;}
		if (inputSampleL < -1.0) {inputSampleL = -1.0;}
		if (inputSampleR > 1.0) {inputSampleR = 1.0;}
		if (inputSampleR < -1.0) {inputSampleR = -1.0;}
		
		out = driveone;
		while (out > glitch)
		{
			out -= glitch;
			inputSampleL -= (inputSampleL * (fabs(inputSampleL) * glitch) * (fabs(inputSampleL) * glitch) );
			inputSampleL *= (1.0+glitch);
		}
		//that's taken care of the really high gain stuff
		inputSampleL -= (inputSampleL * (fabs(inputSampleL) * out) * (fabs(inputSampleL) * out) );
		inputSampleL *= (1.0+out);
		
		
		out = driveone;
		while (out > glitch)
		{
			out -= glitch;
			inputSampleR -= (inputSampleR * (fabs(inputSampleR) * glitch) * (fabs(inputSampleR) * glitch) );
			inputSampleR *= (1.0+glitch);
		}
		//that's taken care of the really high gain stuff
		inputSampleR -= (inputSampleR * (fabs(inputSampleR) * out) * (fabs(inputSampleR) * out) );
		inputSampleR *= (1.0+out);
		
		ataLowpass = (ataLowpassL + ataLowpassR) / 2.0;
		
		if (ataLowpass > 0)
		{if (WasNegative){SubOctave = !SubOctave;} WasNegative = false;}
		else {WasNegative = true;}
		//set up polarities for sub-bass version
		randy = (double(fpdL)/UINT32_MAX)*fuzz; //0 to 1 the noise, may not be needed
		invrandy = (1.0-randy);
		randy /= 2.0;
		//set up the noise
		
		iirSampleA = (iirSampleA * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleA;
		iirSampleB = (iirSampleB * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleB;
		iirSampleC = (iirSampleC * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleC;
		iirSampleD = (iirSampleD * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleD;
		iirSampleE = (iirSampleE * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleE;
		iirSampleF = (iirSampleF * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleF;
		iirSampleG = (iirSampleG * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleG;
		iirSampleH = (iirSampleH * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleH;
		iirSampleI = (iirSampleI * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleI;
		iirSampleJ = (iirSampleJ * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleJ;
		iirSampleK = (iirSampleK * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleK;
		iirSampleL = (iirSampleL * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleL;
		iirSampleM = (iirSampleM * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleM;
		iirSampleN = (iirSampleN * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleN;
		iirSampleO = (iirSampleO * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleO;
		iirSampleP = (iirSampleP * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleP;
		iirSampleQ = (iirSampleQ * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleQ;
		iirSampleR = (iirSampleR * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleR;
		iirSampleS = (iirSampleS * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleS;
		iirSampleT = (iirSampleT * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleT;
		iirSampleU = (iirSampleU * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleU;
		iirSampleV = (iirSampleV * altBmount) + (ataLowpass * iirBmount); ataLowpass -= iirSampleV;
		
		switch (bflip)
		{
			case 1:				
				iirHeadBumpA += (ataLowpass * BassGain);
				iirHeadBumpA -= (iirHeadBumpA * iirHeadBumpA * iirHeadBumpA * HeadBumpFreq);
				iirHeadBumpA = (invrandy * iirHeadBumpA) + (randy * iirHeadBumpB) + (randy * iirHeadBumpC);
				if (iirHeadBumpA > 0) iirHeadBumpA -= clamp;
				if (iirHeadBumpA < 0) iirHeadBumpA += clamp;
				HeadBump = iirHeadBumpA;
				break;
			case 2:
				iirHeadBumpB += (ataLowpass * BassGain);
				iirHeadBumpB -= (iirHeadBumpB * iirHeadBumpB * iirHeadBumpB * HeadBumpFreq);
				iirHeadBumpB = (randy * iirHeadBumpA) + (invrandy * iirHeadBumpB) + (randy * iirHeadBumpC);
				if (iirHeadBumpB > 0) iirHeadBumpB -= clamp;
				if (iirHeadBumpB < 0) iirHeadBumpB += clamp;
				HeadBump = iirHeadBumpB;
				break;
			case 3:
				iirHeadBumpC += (ataLowpass * BassGain);
				iirHeadBumpC -= (iirHeadBumpC * iirHeadBumpC * iirHeadBumpC * HeadBumpFreq);
				iirHeadBumpC = (randy * iirHeadBumpA) + (randy * iirHeadBumpB) + (invrandy * iirHeadBumpC);
				if (iirHeadBumpC > 0) iirHeadBumpC -= clamp;
				if (iirHeadBumpC < 0) iirHeadBumpC += clamp;
				HeadBump = iirHeadBumpC;
				break;
		}
		
		iirSampleW = (iirSampleW * altBmount) + (HeadBump * iirBmount); HeadBump -= iirSampleW;
		iirSampleX = (iirSampleX * altBmount) + (HeadBump * iirBmount); HeadBump -= iirSampleX;
		
		SubBump = HeadBump;
		iirSampleY = (iirSampleY * altCmount) + (SubBump * iirCmount); SubBump -= iirSampleY;
		
		SubBump = fabs(SubBump);
		if (SubOctave == false) {SubBump = -SubBump;}
		
		switch (bflip)
		{
			case 1:				
				iirSubBumpA += (SubBump * SubGain);
				iirSubBumpA -= (iirSubBumpA * iirSubBumpA * iirSubBumpA * SubBumpFreq);
				iirSubBumpA = (invrandy * iirSubBumpA) + (randy * iirSubBumpB) + (randy * iirSubBumpC);
				if (iirSubBumpA > 0) iirSubBumpA -= clamp;
				if (iirSubBumpA < 0) iirSubBumpA += clamp;
				SubBump = iirSubBumpA;
				break;
			case 2:
				iirSubBumpB += (SubBump * SubGain);
				iirSubBumpB -= (iirSubBumpB * iirSubBumpB * iirSubBumpB * SubBumpFreq);
				iirSubBumpB = (randy * iirSubBumpA) + (invrandy * iirSubBumpB) + (randy * iirSubBumpC);
				if (iirSubBumpB > 0) iirSubBumpB -= clamp;
				if (iirSubBumpB < 0) iirSubBumpB += clamp;
				SubBump = iirSubBumpB;
				break;
			case 3:
				iirSubBumpC += (SubBump * SubGain);
				iirSubBumpC -= (iirSubBumpC * iirSubBumpC * iirSubBumpC * SubBumpFreq);
				iirSubBumpC = (randy * iirSubBumpA) + (randy * iirSubBumpB) + (invrandy * iirSubBumpC);
				if (iirSubBumpC > 0) iirSubBumpC -= clamp;
				if (iirSubBumpC < 0) iirSubBumpC += clamp;
				SubBump = iirSubBumpC;
				break;
		}
		
		iirSampleZ = (iirSampleZ * altCmount) + (SubBump * iirCmount); SubBump -= iirSampleZ;
		
		inputSampleL *= driveoutput; //start with the drive section then add lows and subs
		inputSampleR *= driveoutput; //start with the drive section then add lows and subs
		
		inputSampleL += ((HeadBump + lastHeadBump) * BassOutGain);
		inputSampleL += ((SubBump + lastSubBump) * SubOutGain);
		
		inputSampleR += ((HeadBump + lastHeadBump) * BassOutGain);
		inputSampleR += ((SubBump + lastSubBump) * SubOutGain);
		
		lastHeadBump = HeadBump;
		lastSubBump = SubBump;
		
		if (wet != 1.0) {
			inputSampleL = (inputSampleL * wet) + (drySampleL * (1.0-wet));
			inputSampleR = (inputSampleR * wet) + (drySampleR * (1.0-wet));
		}
		//Dry/Wet control, defaults to the last slider
		
		flip = !flip;
		bflip++;
		if (bflip < 1 || bflip > 3) bflip = 1;
		
		//begin 32 bit stereo floating point dither
		int expon; frexpf((float)inputSampleL, &expon);
		fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
		inputSampleL += double((double(fpdL)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2.0,expon+62.0));
		frexpf((float)inputSampleR, &expon);
		fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
		inputSampleR += double((double(fpdR)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2.0,expon+62.0));
		//end 32 bit stereo floating point dither
		
		*out1 = float(inputSampleL);
		*out2 = float(inputSampleR);

		in1++;
		in2++;
		out1++;
		out2++;
    }
}

} // end namespace

#endif // SHR3D_SFX_CORE_AIRWINDOWS
