/* ========================================
 *  Cabs2 - Cabs2.h
 *  Copyright (c) airwindows, Airwindows uses the MIT license
 * ======================================== */

#ifndef __Cabs2_H
#include "Cabs2.h"
#endif

void Cabs2::processReplacing(float **inputs, float **outputs, VstInt32 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 lFreq = pow(fmax(A,0.002),overallscale); //the lowpass
	double hFreq = pow(B,overallscale+2.0); //the highpass
	
    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;
		
		if (hFreq > 0.0) {
			double lowSampleL = inputSampleL;
			double lowSampleR = inputSampleR;
			for(int count = 0; count < 21; count++) {
				iirHAngleL[count] = (iirHAngleL[count]*(1.0-hFreq))+((lowSampleL-iirHPositionL[count])*hFreq);
				lowSampleL = ((iirHPositionL[count]+(iirHAngleL[count]*hFreq))*(1.0-hFreq))+(lowSampleL*hFreq);
				iirHPositionL[count] = ((iirHPositionL[count]+(iirHAngleL[count]*hFreq))*(1.0-hFreq))+(lowSampleL*hFreq);
				inputSampleL -= (lowSampleL * (1.0/21.0));//left
				iirHAngleR[count] = (iirHAngleR[count]*(1.0-hFreq))+((lowSampleR-iirHPositionR[count])*hFreq);
				lowSampleR = ((iirHPositionR[count]+(iirHAngleR[count]*hFreq))*(1.0-hFreq))+(lowSampleR*hFreq);
				iirHPositionR[count] = ((iirHPositionR[count]+(iirHAngleR[count]*hFreq))*(1.0-hFreq))+(lowSampleR*hFreq);
				inputSampleR -= (lowSampleR * (1.0/21.0));//right
			} //the highpass
			hBypass = false;
		} else {
			if (!hBypass) {
				hBypass = true;
				for(int count = 0; count < 22; count++) {
					iirHPositionL[count] = 0.0;
					iirHAngleL[count] = 0.0;
					iirHPositionR[count] = 0.0;
					iirHAngleR[count] = 0.0;
				}
			} //blank out highpass if jut switched off
		}
		
		if (lFreq < 1.0) {
			for(int count = 0; count < 13; count++) {
				iirLAngleL[count] = (iirLAngleL[count]*(1.0-lFreq))+((inputSampleL-iirLPositionL[count])*lFreq);
				inputSampleL = ((iirLPositionL[count]+(iirLAngleL[count]*lFreq))*(1.0-lFreq))+(inputSampleL*lFreq);
				iirLPositionL[count] = ((iirLPositionL[count]+(iirLAngleL[count]*lFreq))*(1.0-lFreq))+(inputSampleL*lFreq);//left
				iirLAngleR[count] = (iirLAngleR[count]*(1.0-lFreq))+((inputSampleR-iirLPositionR[count])*lFreq);
				inputSampleR = ((iirLPositionR[count]+(iirLAngleR[count]*lFreq))*(1.0-lFreq))+(inputSampleR*lFreq);
				iirLPositionR[count] = ((iirLPositionR[count]+(iirLAngleR[count]*lFreq))*(1.0-lFreq))+(inputSampleR*lFreq);//right
			} //the lowpass
			lBypass = false;
		} else {
			if (!lBypass) {
				lBypass = true;
				for(int count = 0; count < 14; count++) {
					iirLPositionL[count] = 0.0;
					iirLAngleL[count] = 0.0;
					iirLPositionR[count] = 0.0;
					iirLAngleR[count] = 0.0;
				}
			} //blank out lowpass if just switched off
		}
		
		//begin 32 bit stereo floating point dither
		int expon; frexpf((float)inputSampleL, &expon);
		fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
		inputSampleL += ((double(fpdL)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
		frexpf((float)inputSampleR, &expon);
		fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
		inputSampleR += ((double(fpdR)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
		//end 32 bit stereo floating point dither
		
		*out1 = inputSampleL;
		*out2 = inputSampleR;

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

void Cabs2::processDoubleReplacing(double **inputs, double **outputs, VstInt32 sampleFrames) 
{
    double* in1  =  inputs[0];
    double* in2  =  inputs[1];
    double* out1 = outputs[0];
    double* out2 = outputs[1];

	double overallscale = 1.0;
	overallscale /= 44100.0;
	overallscale *= getSampleRate();
	
	double lFreq = pow(fmax(A,0.002),overallscale); //the lowpass
	double hFreq = pow(B,overallscale+2.0); //the highpass
	
    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;
		
		if (hFreq > 0.0) {
			double lowSampleL = inputSampleL;
			double lowSampleR = inputSampleR;
			for(int count = 0; count < 21; count++) {
				iirHAngleL[count] = (iirHAngleL[count]*(1.0-hFreq))+((lowSampleL-iirHPositionL[count])*hFreq);
				lowSampleL = ((iirHPositionL[count]+(iirHAngleL[count]*hFreq))*(1.0-hFreq))+(lowSampleL*hFreq);
				iirHPositionL[count] = ((iirHPositionL[count]+(iirHAngleL[count]*hFreq))*(1.0-hFreq))+(lowSampleL*hFreq);
				inputSampleL -= (lowSampleL * (1.0/21.0));//left
				iirHAngleR[count] = (iirHAngleR[count]*(1.0-hFreq))+((lowSampleR-iirHPositionR[count])*hFreq);
				lowSampleR = ((iirHPositionR[count]+(iirHAngleR[count]*hFreq))*(1.0-hFreq))+(lowSampleR*hFreq);
				iirHPositionR[count] = ((iirHPositionR[count]+(iirHAngleR[count]*hFreq))*(1.0-hFreq))+(lowSampleR*hFreq);
				inputSampleR -= (lowSampleR * (1.0/21.0));//right
			} //the highpass
			hBypass = false;
		} else {
			if (!hBypass) {
				hBypass = true;
				for(int count = 0; count < 22; count++) {
					iirHPositionL[count] = 0.0;
					iirHAngleL[count] = 0.0;
					iirHPositionR[count] = 0.0;
					iirHAngleR[count] = 0.0;
				}
			} //blank out highpass if jut switched off
		}
		
		if (lFreq < 1.0) {
			for(int count = 0; count < 13; count++) {
				iirLAngleL[count] = (iirLAngleL[count]*(1.0-lFreq))+((inputSampleL-iirLPositionL[count])*lFreq);
				inputSampleL = ((iirLPositionL[count]+(iirLAngleL[count]*lFreq))*(1.0-lFreq))+(inputSampleL*lFreq);
				iirLPositionL[count] = ((iirLPositionL[count]+(iirLAngleL[count]*lFreq))*(1.0-lFreq))+(inputSampleL*lFreq);//left
				iirLAngleR[count] = (iirLAngleR[count]*(1.0-lFreq))+((inputSampleR-iirLPositionR[count])*lFreq);
				inputSampleR = ((iirLPositionR[count]+(iirLAngleR[count]*lFreq))*(1.0-lFreq))+(inputSampleR*lFreq);
				iirLPositionR[count] = ((iirLPositionR[count]+(iirLAngleR[count]*lFreq))*(1.0-lFreq))+(inputSampleR*lFreq);//right
			} //the lowpass
			lBypass = false;
		} else {
			if (!lBypass) {
				lBypass = true;
				for(int count = 0; count < 14; count++) {
					iirLPositionL[count] = 0.0;
					iirLAngleL[count] = 0.0;
					iirLPositionR[count] = 0.0;
					iirLAngleR[count] = 0.0;
				}
			} //blank out lowpass if just switched off
		}
		
		//begin 64 bit stereo floating point dither
		//int expon; frexp((double)inputSampleL, &expon);
		fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
		//inputSampleL += ((double(fpdL)-uint32_t(0x7fffffff)) * 1.1e-44l * pow(2,expon+62));
		//frexp((double)inputSampleR, &expon);
		fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
		//inputSampleR += ((double(fpdR)-uint32_t(0x7fffffff)) * 1.1e-44l * pow(2,expon+62));
		//end 64 bit stereo floating point dither
		
		*out1 = inputSampleL;
		*out2 = inputSampleR;

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