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

#ifndef __BeziComp_H
#include "BeziComp.h"
#endif

void BeziComp::processReplacing(float **inputs, float **outputs, VstInt32 sampleFrames) 
{
    float* in1  =  inputs[0];
    float* in2  =  inputs[1];
    float* out1 = outputs[0];
    float* out2 = outputs[1];

	VstInt32 inFramesToProcess = sampleFrames; //vst doesn't give us this as a separate variable so we'll make it
	double overallscale = 1.0;
	overallscale /= 44100.0;
	overallscale *= getSampleRate();
	int spacing = floor(overallscale); //should give us working basic scaling, usually 2 or 4
	if (spacing < 1) spacing = 1; if (spacing > 16) spacing = 16;
	
	double bezCThresh = pow(A,2.0) * 64.0;
	double bezMakeUp = sqrt(bezCThresh+1.0);
	double bezRez = (pow(B,6.0)+0.0001)/overallscale; if (bezRez > 1.0) bezRez = 1.0;
	double wet = C;
	
    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;
		
		bezComp[bez_cycle] += bezRez;
		bezComp[bez_SampL] += (fmax(fabs(inputSampleL),fabs(inputSampleR)) * bezRez);
		
		if (bezComp[bez_cycle] > 1.0) {
			bezComp[bez_cycle] -= 1.0;
			bezComp[bez_CL] = bezComp[bez_BL];
			bezComp[bez_BL] = bezComp[bez_AL];
			bezComp[bez_AL] = bezComp[bez_SampL];
			bezComp[bez_SampL] = 0.0;
		}
		double CBL = (bezComp[bez_CL]*(1.0-bezComp[bez_cycle]))+(bezComp[bez_BL]*bezComp[bez_cycle]);
		double BAL = (bezComp[bez_BL]*(1.0-bezComp[bez_cycle]))+(bezComp[bez_AL]*bezComp[bez_cycle]);
		double CBAL = (bezComp[bez_BL]+(CBL*(1.0-bezComp[bez_cycle]))+(BAL*bezComp[bez_cycle]))*0.5;
		
		inputSampleL *= 1.0-(fmin(CBAL*bezCThresh,1.0));
		inputSampleL *= bezMakeUp;
		inputSampleR *= 1.0-(fmin(CBAL*bezCThresh,1.0));
		inputSampleR *= bezMakeUp;
		
		if (wet < 1.0) {
			inputSampleL = (inputSampleL * wet) + (drySampleL * (1.0-wet));
			inputSampleR = (inputSampleR * wet) + (drySampleR * (1.0-wet));
		}
		
		//begin ClipOnly2 stereo as a little, compressed chunk that can be dropped into code
		if (inputSampleL > 4.0) inputSampleL = 4.0; if (inputSampleL < -4.0) inputSampleL = -4.0;
		if (wasPosClipL == true) { //current will be over
			if (inputSampleL<lastSampleL) lastSampleL=0.7058208+(inputSampleL*0.2609148);
			else lastSampleL = 0.2491717+(lastSampleL*0.7390851);
		} wasPosClipL = false;
		if (inputSampleL>0.9549925859) {wasPosClipL=true;inputSampleL=0.7058208+(lastSampleL*0.2609148);}
		if (wasNegClipL == true) { //current will be -over
			if (inputSampleL > lastSampleL) lastSampleL=-0.7058208+(inputSampleL*0.2609148);
			else lastSampleL=-0.2491717+(lastSampleL*0.7390851);
		} wasNegClipL = false;
		if (inputSampleL<-0.9549925859) {wasNegClipL=true;inputSampleL=-0.7058208+(lastSampleL*0.2609148);}
		intermediateL[spacing] = inputSampleL;
        inputSampleL = lastSampleL; //Latency is however many samples equals one 44.1k sample
		for (int x = spacing; x > 0; x--) intermediateL[x-1] = intermediateL[x];
		lastSampleL = intermediateL[0]; //run a little buffer to handle this
		
		if (inputSampleR > 4.0) inputSampleR = 4.0; if (inputSampleR < -4.0) inputSampleR = -4.0;
		if (wasPosClipR == true) { //current will be over
			if (inputSampleR<lastSampleR) lastSampleR=0.7058208+(inputSampleR*0.2609148);
			else lastSampleR = 0.2491717+(lastSampleR*0.7390851);
		} wasPosClipR = false;
		if (inputSampleR>0.9549925859) {wasPosClipR=true;inputSampleR=0.7058208+(lastSampleR*0.2609148);}
		if (wasNegClipR == true) { //current will be -over
			if (inputSampleR > lastSampleR) lastSampleR=-0.7058208+(inputSampleR*0.2609148);
			else lastSampleR=-0.2491717+(lastSampleR*0.7390851);
		} wasNegClipR = false;
		if (inputSampleR<-0.9549925859) {wasNegClipR=true;inputSampleR=-0.7058208+(lastSampleR*0.2609148);}
		intermediateR[spacing] = inputSampleR;
		inputSampleR = lastSampleR; //Latency is however many samples equals one 44.1k sample
		for (int x = spacing; x > 0; x--) intermediateR[x-1] = intermediateR[x];
		lastSampleR = intermediateR[0]; //run a little buffer to handle this
		//end ClipOnly2 stereo as a little, compressed chunk that can be dropped into code
		
		//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 BeziComp::processDoubleReplacing(double **inputs, double **outputs, VstInt32 sampleFrames) 
{
    double* in1  =  inputs[0];
    double* in2  =  inputs[1];
    double* out1 = outputs[0];
    double* out2 = outputs[1];

	VstInt32 inFramesToProcess = sampleFrames; //vst doesn't give us this as a separate variable so we'll make it
	double overallscale = 1.0;
	overallscale /= 44100.0;
	overallscale *= getSampleRate();
	int spacing = floor(overallscale); //should give us working basic scaling, usually 2 or 4
	if (spacing < 1) spacing = 1; if (spacing > 16) spacing = 16;
	
	double bezCThresh = pow(A,2.0) * 64.0;
	double bezMakeUp = sqrt(bezCThresh+1.0);
	double bezRez = (pow(B,6.0)+0.0001)/overallscale; if (bezRez > 1.0) bezRez = 1.0;
	double wet = C;
	
    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;
		
		bezComp[bez_cycle] += bezRez;
		bezComp[bez_SampL] += (fmax(fabs(inputSampleL),fabs(inputSampleR)) * bezRez);
		
		if (bezComp[bez_cycle] > 1.0) {
			bezComp[bez_cycle] -= 1.0;
			bezComp[bez_CL] = bezComp[bez_BL];
			bezComp[bez_BL] = bezComp[bez_AL];
			bezComp[bez_AL] = bezComp[bez_SampL];
			bezComp[bez_SampL] = 0.0;
		}
		double CBL = (bezComp[bez_CL]*(1.0-bezComp[bez_cycle]))+(bezComp[bez_BL]*bezComp[bez_cycle]);
		double BAL = (bezComp[bez_BL]*(1.0-bezComp[bez_cycle]))+(bezComp[bez_AL]*bezComp[bez_cycle]);
		double CBAL = (bezComp[bez_BL]+(CBL*(1.0-bezComp[bez_cycle]))+(BAL*bezComp[bez_cycle]))*0.5;
		
		inputSampleL *= 1.0-(fmin(CBAL*bezCThresh,1.0));
		inputSampleL *= bezMakeUp;
		inputSampleR *= 1.0-(fmin(CBAL*bezCThresh,1.0));
		inputSampleR *= bezMakeUp;
		
		if (wet < 1.0) {
			inputSampleL = (inputSampleL * wet) + (drySampleL * (1.0-wet));
			inputSampleR = (inputSampleR * wet) + (drySampleR * (1.0-wet));
		}
		
		//begin ClipOnly2 stereo as a little, compressed chunk that can be dropped into code
		if (inputSampleL > 4.0) inputSampleL = 4.0; if (inputSampleL < -4.0) inputSampleL = -4.0;
		if (wasPosClipL == true) { //current will be over
			if (inputSampleL<lastSampleL) lastSampleL=0.7058208+(inputSampleL*0.2609148);
			else lastSampleL = 0.2491717+(lastSampleL*0.7390851);
		} wasPosClipL = false;
		if (inputSampleL>0.9549925859) {wasPosClipL=true;inputSampleL=0.7058208+(lastSampleL*0.2609148);}
		if (wasNegClipL == true) { //current will be -over
			if (inputSampleL > lastSampleL) lastSampleL=-0.7058208+(inputSampleL*0.2609148);
			else lastSampleL=-0.2491717+(lastSampleL*0.7390851);
		} wasNegClipL = false;
		if (inputSampleL<-0.9549925859) {wasNegClipL=true;inputSampleL=-0.7058208+(lastSampleL*0.2609148);}
		intermediateL[spacing] = inputSampleL;
        inputSampleL = lastSampleL; //Latency is however many samples equals one 44.1k sample
		for (int x = spacing; x > 0; x--) intermediateL[x-1] = intermediateL[x];
		lastSampleL = intermediateL[0]; //run a little buffer to handle this
		
		if (inputSampleR > 4.0) inputSampleR = 4.0; if (inputSampleR < -4.0) inputSampleR = -4.0;
		if (wasPosClipR == true) { //current will be over
			if (inputSampleR<lastSampleR) lastSampleR=0.7058208+(inputSampleR*0.2609148);
			else lastSampleR = 0.2491717+(lastSampleR*0.7390851);
		} wasPosClipR = false;
		if (inputSampleR>0.9549925859) {wasPosClipR=true;inputSampleR=0.7058208+(lastSampleR*0.2609148);}
		if (wasNegClipR == true) { //current will be -over
			if (inputSampleR > lastSampleR) lastSampleR=-0.7058208+(inputSampleR*0.2609148);
			else lastSampleR=-0.2491717+(lastSampleR*0.7390851);
		} wasNegClipR = false;
		if (inputSampleR<-0.9549925859) {wasNegClipR=true;inputSampleR=-0.7058208+(lastSampleR*0.2609148);}
		intermediateR[spacing] = inputSampleR;
		inputSampleR = lastSampleR; //Latency is however many samples equals one 44.1k sample
		for (int x = spacing; x > 0; x--) intermediateR[x-1] = intermediateR[x];
		lastSampleR = intermediateR[0]; //run a little buffer to handle this
		//end ClipOnly2 stereo as a little, compressed chunk that can be dropped into code
		
		//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++;
    }
}