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

#include "Parametric.h"

#ifdef SHR3D_SFX_CORE_AIRWINDOWS

namespace airwinconsolidated::Parametric {

void Parametric::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();
	
	high[biqs_freq] = (((pow(A,3)*14500.0)+1500.0)/getSampleRate());
	if (high[biqs_freq] < 0.0001) high[biqs_freq] = 0.0001;
	high[biqs_nonlin] = B;
	high[biqs_level] = (high[biqs_nonlin]*2.0)-1.0;
	if (high[biqs_level] > 0.0) high[biqs_level] *= 2.0;
	high[biqs_reso] = ((0.5+(high[biqs_nonlin]*0.5)+sqrt(high[biqs_freq]))-(1.0-pow(1.0-C,2.0)))+0.5+(high[biqs_nonlin]*0.5);
	double K = tan(M_PI * high[biqs_freq]);
	double norm = 1.0 / (1.0 + K / (high[biqs_reso]*1.93185165) + K * K);
	high[biqs_a0] = K / (high[biqs_reso]*1.93185165) * norm;
	high[biqs_b1] = 2.0 * (K * K - 1.0) * norm;
	high[biqs_b2] = (1.0 - K / (high[biqs_reso]*1.93185165) + K * K) * norm;
	norm = 1.0 / (1.0 + K / (high[biqs_reso]*0.70710678) + K * K);
	high[biqs_c0] = K / (high[biqs_reso]*0.70710678) * norm;
	high[biqs_d1] = 2.0 * (K * K - 1.0) * norm;
	high[biqs_d2] = (1.0 - K / (high[biqs_reso]*0.70710678) + K * K) * norm;
	norm = 1.0 / (1.0 + K / (high[biqs_reso]*0.51763809) + K * K);
	high[biqs_e0] = K / (high[biqs_reso]*0.51763809) * norm;
	high[biqs_f1] = 2.0 * (K * K - 1.0) * norm;
	high[biqs_f2] = (1.0 - K / (high[biqs_reso]*0.51763809) + K * K) * norm;
	//high
	
	hmid[biqs_freq] = (((pow(D,3)*6400.0)+600.0)/getSampleRate());
	if (hmid[biqs_freq] < 0.0001) hmid[biqs_freq] = 0.0001;
	hmid[biqs_nonlin] = E;
	hmid[biqs_level] = (hmid[biqs_nonlin]*2.0)-1.0;
	if (hmid[biqs_level] > 0.0) hmid[biqs_level] *= 2.0;
	hmid[biqs_reso] = ((0.5+(hmid[biqs_nonlin]*0.5)+sqrt(hmid[biqs_freq]))-(1.0-pow(1.0-F,2.0)))+0.5+(hmid[biqs_nonlin]*0.5);
	K = tan(M_PI * hmid[biqs_freq]);
	norm = 1.0 / (1.0 + K / (hmid[biqs_reso]*1.93185165) + K * K);
	hmid[biqs_a0] = K / (hmid[biqs_reso]*1.93185165) * norm;
	hmid[biqs_b1] = 2.0 * (K * K - 1.0) * norm;
	hmid[biqs_b2] = (1.0 - K / (hmid[biqs_reso]*1.93185165) + K * K) * norm;
	norm = 1.0 / (1.0 + K / (hmid[biqs_reso]*0.70710678) + K * K);
	hmid[biqs_c0] = K / (hmid[biqs_reso]*0.70710678) * norm;
	hmid[biqs_d1] = 2.0 * (K * K - 1.0) * norm;
	hmid[biqs_d2] = (1.0 - K / (hmid[biqs_reso]*0.70710678) + K * K) * norm;
	norm = 1.0 / (1.0 + K / (hmid[biqs_reso]*0.51763809) + K * K);
	hmid[biqs_e0] = K / (hmid[biqs_reso]*0.51763809) * norm;
	hmid[biqs_f1] = 2.0 * (K * K - 1.0) * norm;
	hmid[biqs_f2] = (1.0 - K / (hmid[biqs_reso]*0.51763809) + K * K) * norm;
	//hmid
	
	lmid[biqs_freq] = (((pow(G,3)*2200.0)+20.0)/getSampleRate());
	if (lmid[biqs_freq] < 0.00001) lmid[biqs_freq] = 0.00001;
	lmid[biqs_nonlin] = H;
	lmid[biqs_level] = (lmid[biqs_nonlin]*2.0)-1.0;
	if (lmid[biqs_level] > 0.0) lmid[biqs_level] *= 2.0;
	lmid[biqs_reso] = ((0.5+(lmid[biqs_nonlin]*0.5)+sqrt(lmid[biqs_freq]))-(1.0-pow(1.0-I,2.0)))+0.5+(lmid[biqs_nonlin]*0.5);
	K = tan(M_PI * lmid[biqs_freq]);
	norm = 1.0 / (1.0 + K / (lmid[biqs_reso]*1.93185165) + K * K);
	lmid[biqs_a0] = K / (lmid[biqs_reso]*1.93185165) * norm;
	lmid[biqs_b1] = 2.0 * (K * K - 1.0) * norm;
	lmid[biqs_b2] = (1.0 - K / (lmid[biqs_reso]*1.93185165) + K * K) * norm;
	norm = 1.0 / (1.0 + K / (lmid[biqs_reso]*0.70710678) + K * K);
	lmid[biqs_c0] = K / (lmid[biqs_reso]*0.70710678) * norm;
	lmid[biqs_d1] = 2.0 * (K * K - 1.0) * norm;
	lmid[biqs_d2] = (1.0 - K / (lmid[biqs_reso]*0.70710678) + K * K) * norm;
	norm = 1.0 / (1.0 + K / (lmid[biqs_reso]*0.51763809) + K * K);
	lmid[biqs_e0] = K / (lmid[biqs_reso]*0.51763809) * norm;
	lmid[biqs_f1] = 2.0 * (K * K - 1.0) * norm;
	lmid[biqs_f2] = (1.0 - K / (lmid[biqs_reso]*0.51763809) + K * K) * norm;
	//lmid
	
	double wet = J;
	
    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;

		//begin Stacked Biquad With Reversed Neutron Flow L
		high[biqs_outL] = inputSampleL * fabs(high[biqs_level]);
		high[biqs_dis] = fabs(high[biqs_a0] * (1.0+(high[biqs_outL]*high[biqs_nonlin])));
		if (high[biqs_dis] > 1.0) high[biqs_dis] = 1.0;
		high[biqs_temp] = (high[biqs_outL] * high[biqs_dis]) + high[biqs_aL1];
		high[biqs_aL1] = high[biqs_aL2] - (high[biqs_temp]*high[biqs_b1]);
		high[biqs_aL2] = (high[biqs_outL] * -high[biqs_dis]) - (high[biqs_temp]*high[biqs_b2]);
		high[biqs_outL] = high[biqs_temp];
		high[biqs_dis] = fabs(high[biqs_c0] * (1.0+(high[biqs_outL]*high[biqs_nonlin])));
		if (high[biqs_dis] > 1.0) high[biqs_dis] = 1.0;
		high[biqs_temp] = (high[biqs_outL] * high[biqs_dis]) + high[biqs_cL1];
		high[biqs_cL1] = high[biqs_cL2] - (high[biqs_temp]*high[biqs_d1]);
		high[biqs_cL2] = (high[biqs_outL] * -high[biqs_dis]) - (high[biqs_temp]*high[biqs_d2]);
		high[biqs_outL] = high[biqs_temp];
		high[biqs_dis] = fabs(high[biqs_e0] * (1.0+(high[biqs_outL]*high[biqs_nonlin])));
		if (high[biqs_dis] > 1.0) high[biqs_dis] = 1.0;
		high[biqs_temp] = (high[biqs_outL] * high[biqs_dis]) + high[biqs_eL1];
		high[biqs_eL1] = high[biqs_eL2] - (high[biqs_temp]*high[biqs_f1]);
		high[biqs_eL2] = (high[biqs_outL] * -high[biqs_dis]) - (high[biqs_temp]*high[biqs_f2]);
		high[biqs_outL] = high[biqs_temp]; high[biqs_outL] *= high[biqs_level];
		if (high[biqs_level] > 1.0) high[biqs_outL] *= high[biqs_level];
		//end Stacked Biquad With Reversed Neutron Flow L
		
		//begin Stacked Biquad With Reversed Neutron Flow L
		hmid[biqs_outL] = inputSampleL * fabs(hmid[biqs_level]);
		hmid[biqs_dis] = fabs(hmid[biqs_a0] * (1.0+(hmid[biqs_outL]*hmid[biqs_nonlin])));
		if (hmid[biqs_dis] > 1.0) hmid[biqs_dis] = 1.0;
		hmid[biqs_temp] = (hmid[biqs_outL] * hmid[biqs_dis]) + hmid[biqs_aL1];
		hmid[biqs_aL1] = hmid[biqs_aL2] - (hmid[biqs_temp]*hmid[biqs_b1]);
		hmid[biqs_aL2] = (hmid[biqs_outL] * -hmid[biqs_dis]) - (hmid[biqs_temp]*hmid[biqs_b2]);
		hmid[biqs_outL] = hmid[biqs_temp];
		hmid[biqs_dis] = fabs(hmid[biqs_c0] * (1.0+(hmid[biqs_outL]*hmid[biqs_nonlin])));
		if (hmid[biqs_dis] > 1.0) hmid[biqs_dis] = 1.0;
		hmid[biqs_temp] = (hmid[biqs_outL] * hmid[biqs_dis]) + hmid[biqs_cL1];
		hmid[biqs_cL1] = hmid[biqs_cL2] - (hmid[biqs_temp]*hmid[biqs_d1]);
		hmid[biqs_cL2] = (hmid[biqs_outL] * -hmid[biqs_dis]) - (hmid[biqs_temp]*hmid[biqs_d2]);
		hmid[biqs_outL] = hmid[biqs_temp];
		hmid[biqs_dis] = fabs(hmid[biqs_e0] * (1.0+(hmid[biqs_outL]*hmid[biqs_nonlin])));
		if (hmid[biqs_dis] > 1.0) hmid[biqs_dis] = 1.0;
		hmid[biqs_temp] = (hmid[biqs_outL] * hmid[biqs_dis]) + hmid[biqs_eL1];
		hmid[biqs_eL1] = hmid[biqs_eL2] - (hmid[biqs_temp]*hmid[biqs_f1]);
		hmid[biqs_eL2] = (hmid[biqs_outL] * -hmid[biqs_dis]) - (hmid[biqs_temp]*hmid[biqs_f2]);
		hmid[biqs_outL] = hmid[biqs_temp]; hmid[biqs_outL] *= hmid[biqs_level];
		if (hmid[biqs_level] > 1.0) hmid[biqs_outL] *= hmid[biqs_level];
		//end Stacked Biquad With Reversed Neutron Flow L
		
		//begin Stacked Biquad With Reversed Neutron Flow L
		lmid[biqs_outL] = inputSampleL * fabs(lmid[biqs_level]);
		lmid[biqs_dis] = fabs(lmid[biqs_a0] * (1.0+(lmid[biqs_outL]*lmid[biqs_nonlin])));
		if (lmid[biqs_dis] > 1.0) lmid[biqs_dis] = 1.0;
		lmid[biqs_temp] = (lmid[biqs_outL] * lmid[biqs_dis]) + lmid[biqs_aL1];
		lmid[biqs_aL1] = lmid[biqs_aL2] - (lmid[biqs_temp]*lmid[biqs_b1]);
		lmid[biqs_aL2] = (lmid[biqs_outL] * -lmid[biqs_dis]) - (lmid[biqs_temp]*lmid[biqs_b2]);
		lmid[biqs_outL] = lmid[biqs_temp];
		lmid[biqs_dis] = fabs(lmid[biqs_c0] * (1.0+(lmid[biqs_outL]*lmid[biqs_nonlin])));
		if (lmid[biqs_dis] > 1.0) lmid[biqs_dis] = 1.0;
		lmid[biqs_temp] = (lmid[biqs_outL] * lmid[biqs_dis]) + lmid[biqs_cL1];
		lmid[biqs_cL1] = lmid[biqs_cL2] - (lmid[biqs_temp]*lmid[biqs_d1]);
		lmid[biqs_cL2] = (lmid[biqs_outL] * -lmid[biqs_dis]) - (lmid[biqs_temp]*lmid[biqs_d2]);
		lmid[biqs_outL] = lmid[biqs_temp];
		lmid[biqs_dis] = fabs(lmid[biqs_e0] * (1.0+(lmid[biqs_outL]*lmid[biqs_nonlin])));
		if (lmid[biqs_dis] > 1.0) lmid[biqs_dis] = 1.0;
		lmid[biqs_temp] = (lmid[biqs_outL] * lmid[biqs_dis]) + lmid[biqs_eL1];
		lmid[biqs_eL1] = lmid[biqs_eL2] - (lmid[biqs_temp]*lmid[biqs_f1]);
		lmid[biqs_eL2] = (lmid[biqs_outL] * -lmid[biqs_dis]) - (lmid[biqs_temp]*lmid[biqs_f2]);
		lmid[biqs_outL] = lmid[biqs_temp]; lmid[biqs_outL] *= lmid[biqs_level];
		if (lmid[biqs_level] > 1.0) lmid[biqs_outL] *= lmid[biqs_level];
		//end Stacked Biquad With Reversed Neutron Flow L
		
		//begin Stacked Biquad With Reversed Neutron Flow R
		high[biqs_outR] = inputSampleR * fabs(high[biqs_level]);
		high[biqs_dis] = fabs(high[biqs_a0] * (1.0+(high[biqs_outR]*high[biqs_nonlin])));
		if (high[biqs_dis] > 1.0) high[biqs_dis] = 1.0;
		high[biqs_temp] = (high[biqs_outR] * high[biqs_dis]) + high[biqs_aR1];
		high[biqs_aR1] = high[biqs_aR2] - (high[biqs_temp]*high[biqs_b1]);
		high[biqs_aR2] = (high[biqs_outR] * -high[biqs_dis]) - (high[biqs_temp]*high[biqs_b2]);
		high[biqs_outR] = high[biqs_temp];
		high[biqs_dis] = fabs(high[biqs_c0] * (1.0+(high[biqs_outR]*high[biqs_nonlin])));
		if (high[biqs_dis] > 1.0) high[biqs_dis] = 1.0;
		high[biqs_temp] = (high[biqs_outR] * high[biqs_dis]) + high[biqs_cR1];
		high[biqs_cR1] = high[biqs_cR2] - (high[biqs_temp]*high[biqs_d1]);
		high[biqs_cR2] = (high[biqs_outR] * -high[biqs_dis]) - (high[biqs_temp]*high[biqs_d2]);
		high[biqs_outR] = high[biqs_temp];
		high[biqs_dis] = fabs(high[biqs_e0] * (1.0+(high[biqs_outR]*high[biqs_nonlin])));
		if (high[biqs_dis] > 1.0) high[biqs_dis] = 1.0;
		high[biqs_temp] = (high[biqs_outR] * high[biqs_dis]) + high[biqs_eR1];
		high[biqs_eR1] = high[biqs_eR2] - (high[biqs_temp]*high[biqs_f1]);
		high[biqs_eR2] = (high[biqs_outR] * -high[biqs_dis]) - (high[biqs_temp]*high[biqs_f2]);
		high[biqs_outR] = high[biqs_temp]; high[biqs_outR] *= high[biqs_level];
		if (high[biqs_level] > 1.0) high[biqs_outR] *= high[biqs_level];
		//end Stacked Biquad With Reversed Neutron Flow R
		
		//begin Stacked Biquad With Reversed Neutron Flow R
		hmid[biqs_outR] = inputSampleR * fabs(hmid[biqs_level]);
		hmid[biqs_dis] = fabs(hmid[biqs_a0] * (1.0+(hmid[biqs_outR]*hmid[biqs_nonlin])));
		if (hmid[biqs_dis] > 1.0) hmid[biqs_dis] = 1.0;
		hmid[biqs_temp] = (hmid[biqs_outR] * hmid[biqs_dis]) + hmid[biqs_aR1];
		hmid[biqs_aR1] = hmid[biqs_aR2] - (hmid[biqs_temp]*hmid[biqs_b1]);
		hmid[biqs_aR2] = (hmid[biqs_outR] * -hmid[biqs_dis]) - (hmid[biqs_temp]*hmid[biqs_b2]);
		hmid[biqs_outR] = hmid[biqs_temp];
		hmid[biqs_dis] = fabs(hmid[biqs_c0] * (1.0+(hmid[biqs_outR]*hmid[biqs_nonlin])));
		if (hmid[biqs_dis] > 1.0) hmid[biqs_dis] = 1.0;
		hmid[biqs_temp] = (hmid[biqs_outR] * hmid[biqs_dis]) + hmid[biqs_cR1];
		hmid[biqs_cR1] = hmid[biqs_cR2] - (hmid[biqs_temp]*hmid[biqs_d1]);
		hmid[biqs_cR2] = (hmid[biqs_outR] * -hmid[biqs_dis]) - (hmid[biqs_temp]*hmid[biqs_d2]);
		hmid[biqs_outR] = hmid[biqs_temp];
		hmid[biqs_dis] = fabs(hmid[biqs_e0] * (1.0+(hmid[biqs_outR]*hmid[biqs_nonlin])));
		if (hmid[biqs_dis] > 1.0) hmid[biqs_dis] = 1.0;
		hmid[biqs_temp] = (hmid[biqs_outR] * hmid[biqs_dis]) + hmid[biqs_eR1];
		hmid[biqs_eR1] = hmid[biqs_eR2] - (hmid[biqs_temp]*hmid[biqs_f1]);
		hmid[biqs_eR2] = (hmid[biqs_outR] * -hmid[biqs_dis]) - (hmid[biqs_temp]*hmid[biqs_f2]);
		hmid[biqs_outR] = hmid[biqs_temp]; hmid[biqs_outR] *= hmid[biqs_level];
		if (hmid[biqs_level] > 1.0) hmid[biqs_outR] *= hmid[biqs_level];
		//end Stacked Biquad With Reversed Neutron Flow R
		
		//begin Stacked Biquad With Reversed Neutron Flow R
		lmid[biqs_outR] = inputSampleR * fabs(lmid[biqs_level]);
		lmid[biqs_dis] = fabs(lmid[biqs_a0] * (1.0+(lmid[biqs_outR]*lmid[biqs_nonlin])));
		if (lmid[biqs_dis] > 1.0) lmid[biqs_dis] = 1.0;
		lmid[biqs_temp] = (lmid[biqs_outR] * lmid[biqs_dis]) + lmid[biqs_aR1];
		lmid[biqs_aR1] = lmid[biqs_aR2] - (lmid[biqs_temp]*lmid[biqs_b1]);
		lmid[biqs_aR2] = (lmid[biqs_outR] * -lmid[biqs_dis]) - (lmid[biqs_temp]*lmid[biqs_b2]);
		lmid[biqs_outR] = lmid[biqs_temp];
		lmid[biqs_dis] = fabs(lmid[biqs_c0] * (1.0+(lmid[biqs_outR]*lmid[biqs_nonlin])));
		if (lmid[biqs_dis] > 1.0) lmid[biqs_dis] = 1.0;
		lmid[biqs_temp] = (lmid[biqs_outR] * lmid[biqs_dis]) + lmid[biqs_cR1];
		lmid[biqs_cR1] = lmid[biqs_cR2] - (lmid[biqs_temp]*lmid[biqs_d1]);
		lmid[biqs_cR2] = (lmid[biqs_outR] * -lmid[biqs_dis]) - (lmid[biqs_temp]*lmid[biqs_d2]);
		lmid[biqs_outR] = lmid[biqs_temp];
		lmid[biqs_dis] = fabs(lmid[biqs_e0] * (1.0+(lmid[biqs_outR]*lmid[biqs_nonlin])));
		if (lmid[biqs_dis] > 1.0) lmid[biqs_dis] = 1.0;
		lmid[biqs_temp] = (lmid[biqs_outR] * lmid[biqs_dis]) + lmid[biqs_eR1];
		lmid[biqs_eR1] = lmid[biqs_eR2] - (lmid[biqs_temp]*lmid[biqs_f1]);
		lmid[biqs_eR2] = (lmid[biqs_outR] * -lmid[biqs_dis]) - (lmid[biqs_temp]*lmid[biqs_f2]);
		lmid[biqs_outR] = lmid[biqs_temp]; lmid[biqs_outR] *= lmid[biqs_level];
		if (lmid[biqs_level] > 1.0) lmid[biqs_outR] *= lmid[biqs_level];
		//end Stacked Biquad With Reversed Neutron Flow R
		
		double parametric = high[biqs_outL] + hmid[biqs_outL] + lmid[biqs_outL];
		inputSampleL += (parametric * wet); //purely a parallel filter stage here
		parametric = high[biqs_outR] + hmid[biqs_outR] + lmid[biqs_outR];
		inputSampleR += (parametric * wet); //purely a parallel filter stage here
		
		//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
