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

#include "Isolator.h"

#ifdef SHR3D_SFX_CORE_AIRWINDOWS

namespace airwinconsolidated::Isolator {

void Isolator::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();

 	bool bypass = (A == 1.0);
	double high = B;
	double low = C; //this gives us shelving, and
	//the ability to use the isolator as a highpass
	if (high > 0.0) bypass = false;
	if (low < 1.0) bypass = false;
	
	biquadA[0] = pow(A,(2.0*sqrt(overallscale)))*0.4999;
	if (biquadA[0] < 0.001) biquadA[0] = 0.001;
	biquadC[0] = biquadB[0] = biquadA[0];
	
    biquadA[1] = 0.5;
	biquadB[1] = 0.618033988749894848204586;
	biquadC[1] = 1.618033988749894848204586;
	
	double K = tan(M_PI * biquadA[0]); //lowpass
	double norm = 1.0 / (1.0 + K / biquadA[1] + K * K);
	biquadA[2] = K * K * norm;
	biquadA[3] = 2.0 * biquadA[2];
	biquadA[4] = biquadA[2];
	biquadA[5] = 2.0 * (K * K - 1.0) * norm;
	biquadA[6] = (1.0 - K / biquadA[1] + K * K) * norm;
	
	K = tan(M_PI * biquadA[0]);
	norm = 1.0 / (1.0 + K / biquadB[1] + K * K);
	biquadB[2] = K * K * norm;
	biquadB[3] = 2.0 * biquadB[2];
	biquadB[4] = biquadB[2];
	biquadB[5] = 2.0 * (K * K - 1.0) * norm;
	biquadB[6] = (1.0 - K / biquadB[1] + K * K) * norm;
	
	K = tan(M_PI * biquadC[0]);
	norm = 1.0 / (1.0 + K / biquadC[1] + K * K);
	biquadC[2] = K * K * norm;
	biquadC[3] = 2.0 * biquadC[2];
	biquadC[4] = biquadC[2];
	biquadC[5] = 2.0 * (K * K - 1.0) * norm;
	biquadC[6] = (1.0 - K / biquadC[1] + K * K) * norm;
	
	// there is a form for highpass
	// but I would suggest subtracting the lowpass from dry
		
    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 = *in1;
		double drySampleR = *in2;
		
		inputSampleL = sin(inputSampleL);
		inputSampleR = sin(inputSampleR);
		//encode Console5: good cleanness
		
		double outSampleL = biquadA[2]*inputSampleL+biquadA[3]*biquadA[7]+biquadA[4]*biquadA[8]-biquadA[5]*biquadA[9]-biquadA[6]*biquadA[10];
		biquadA[8] = biquadA[7]; biquadA[7] = inputSampleL; inputSampleL = outSampleL; biquadA[10] = biquadA[9]; biquadA[9] = inputSampleL; //DF1 left
		
		outSampleL = biquadB[2]*inputSampleL+biquadB[3]*biquadB[7]+biquadB[4]*biquadB[8]-biquadB[5]*biquadB[9]-biquadB[6]*biquadB[10];
		biquadB[8] = biquadB[7]; biquadB[7] = inputSampleL; inputSampleL = outSampleL; biquadB[10] = biquadB[9]; biquadB[9] = inputSampleL; //DF1 left
		
		outSampleL = biquadC[2]*inputSampleL+biquadC[3]*biquadC[7]+biquadC[4]*biquadC[8]-biquadC[5]*biquadC[9]-biquadC[6]*biquadC[10];
		biquadC[8] = biquadC[7]; biquadC[7] = inputSampleL; inputSampleL = outSampleL; biquadC[10] = biquadC[9]; biquadC[9] = inputSampleL; //DF1 left
		
		double outSampleR = biquadA[2]*inputSampleR+biquadA[3]*biquadA[11]+biquadA[4]*biquadA[12]-biquadA[5]*biquadA[13]-biquadA[6]*biquadA[14];
		biquadA[12] = biquadA[11]; biquadA[11] = inputSampleR; inputSampleR = outSampleR; biquadA[14] = biquadA[13]; biquadA[13] = inputSampleR; //DF1 right
		
		outSampleR = biquadB[2]*inputSampleR+biquadB[3]*biquadB[11]+biquadB[4]*biquadB[12]-biquadB[5]*biquadB[13]-biquadB[6]*biquadB[14];
		biquadB[12] = biquadB[11]; biquadB[11] = inputSampleR; inputSampleR = outSampleR; biquadB[14] = biquadB[13]; biquadB[13] = inputSampleR; //DF1 right
		
		outSampleR = biquadC[2]*inputSampleR+biquadC[3]*biquadC[11]+biquadC[4]*biquadC[12]-biquadC[5]*biquadC[13]-biquadC[6]*biquadC[14];
		biquadC[12] = biquadC[11]; biquadC[11] = inputSampleR; inputSampleR = outSampleR; biquadC[14] = biquadC[13]; biquadC[13] = inputSampleR; //DF1 right
		
		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;
		
		inputSampleL = asin(inputSampleL);
		inputSampleR = asin(inputSampleR);
		//amplitude aspect
		
		if (bypass) {
			inputSampleL = drySampleL;
			inputSampleR = drySampleR;
		} else {
			inputSampleL = (inputSampleL * low) + ((drySampleL - inputSampleL)*high);
			inputSampleR = (inputSampleR * low) + ((drySampleR - inputSampleR)*high);
		}
		
		//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
