/* ========================================
 *  Desk - Desk.h
 *  Copyright (c) 2016 airwindows, All rights reserved
 * ======================================== */

#ifndef __Desk_H
#include "Desk.h"
#endif

void Desk::processReplacing(float **inputs, float **outputs, VstInt32 sampleFrames) 
{
    float* in1  =  inputs[0];
    float* in2  =  inputs[1];
    float* out1 = outputs[0];
    float* out2 = outputs[1];
	
	double gain = 0.135;
	double slewgain = 0.208;	
	double prevslew = 0.333;
	double balanceB = 0.0001;
	double overallscale = 1.0;
	overallscale /= 44100.0;
	overallscale *= getSampleRate();
	slewgain *= overallscale;
	prevslew *= overallscale;
	balanceB /= overallscale;
	double balanceA = 1.0 - balanceB;
	double slew;
	double bridgerectifier;
	double combsample;
	
	float fpTemp;
	long double fpOld = 0.618033988749894848204586; //golden ratio!
	long double fpNew = 1.0 - fpOld;	

	long double inputSampleL;
	long double inputSampleR;
	long double drySampleL;
	long double drySampleR;
	    
    while (--sampleFrames >= 0)
    {
		inputSampleL = *in1;
		inputSampleR = *in2;
		if (inputSampleL<1.2e-38 && -inputSampleL<1.2e-38) {
			static int noisesource = 0;
			//this declares a variable before anything else is compiled. It won't keep assigning
			//it to 0 for every sample, it's as if the declaration doesn't exist in this context,
			//but it lets me add this denormalization fix in a single place rather than updating
			//it in three different locations. The variable isn't thread-safe but this is only
			//a random seed and we can share it with whatever.
			noisesource = noisesource % 1700021; noisesource++;
			int residue = noisesource * noisesource;
			residue = residue % 170003; residue *= residue;
			residue = residue % 17011; residue *= residue;
			residue = residue % 1709; residue *= residue;
			residue = residue % 173; residue *= residue;
			residue = residue % 17;
			double applyresidue = residue;
			applyresidue *= 0.00000001;
			applyresidue *= 0.00000001;
			inputSampleL = applyresidue;
		}
		if (inputSampleR<1.2e-38 && -inputSampleR<1.2e-38) {
			static int noisesource = 0;
			noisesource = noisesource % 1700021; noisesource++;
			int residue = noisesource * noisesource;
			residue = residue % 170003; residue *= residue;
			residue = residue % 17011; residue *= residue;
			residue = residue % 1709; residue *= residue;
			residue = residue % 173; residue *= residue;
			residue = residue % 17;
			double applyresidue = residue;
			applyresidue *= 0.00000001;
			applyresidue *= 0.00000001;
			inputSampleR = applyresidue;
			//this denormalization routine produces a white noise at -300 dB which the noise
			//shaping will interact with to produce a bipolar output, but the noise is actually
			//all positive. That should stop any variables from going denormal, and the routine
			//only kicks in if digital black is input. As a final touch, if you save to 24-bit
			//the silence will return to being digital black again.
		}
		drySampleL = inputSampleL;
		drySampleR = inputSampleR;
		
		//begin L
		slew = inputSampleL - lastSampleL;
		lastSampleL = inputSampleL;
		//Set up direct reference for slew
		
		bridgerectifier = fabs(slew*slewgain);
		if (bridgerectifier > 1.57079633) bridgerectifier = 1.0;
		else bridgerectifier = sin(bridgerectifier);
		if (slew > 0) slew = bridgerectifier/slewgain;
		else slew = -(bridgerectifier/slewgain);
		
		inputSampleL = (lastOutSampleL*balanceA) + (lastSampleL*balanceB) + slew;
		//go from last slewed, but include some raw values
		lastOutSampleL = inputSampleL;
		//Set up slewed reference
		
		combsample = fabs(drySampleL*lastSampleL);
		if (combsample > 1.0) combsample = 1.0;
		//bailout for very high input gains
		inputSampleL -= (lastSlewL * combsample * prevslew);
		lastSlewL = slew;
		//slew interaction with previous slew
		
		inputSampleL *= gain;
		bridgerectifier = fabs(inputSampleL);
		if (bridgerectifier > 1.57079633) bridgerectifier = 1.0;
		else bridgerectifier = sin(bridgerectifier);
		
		if (inputSampleL > 0) inputSampleL = bridgerectifier;
		else inputSampleL = -bridgerectifier;
		//drive section
		inputSampleL /= gain;
		//end L
		
		//begin R
		slew = inputSampleR - lastSampleR;
		lastSampleR = inputSampleR;
		//Set up direct reference for slew
		
		bridgerectifier = fabs(slew*slewgain);
		if (bridgerectifier > 1.57079633) bridgerectifier = 1.0;
		else bridgerectifier = sin(bridgerectifier);
		if (slew > 0) slew = bridgerectifier/slewgain;
		else slew = -(bridgerectifier/slewgain);
		
		inputSampleR = (lastOutSampleR*balanceA) + (lastSampleR*balanceB) + slew;
		//go from last slewed, but include some raw values
		lastOutSampleR = inputSampleR;
		//Set up slewed reference
		
		combsample = fabs(drySampleR*lastSampleR);
		if (combsample > 1.0) combsample = 1.0;
		//bailout for very high input gains
		inputSampleR -= (lastSlewR * combsample * prevslew);
		lastSlewR = slew;
		//slew interaction with previous slew
		
		inputSampleR *= gain;
		bridgerectifier = fabs(inputSampleR);
		if (bridgerectifier > 1.57079633) bridgerectifier = 1.0;
		else bridgerectifier = sin(bridgerectifier);
		
		if (inputSampleR > 0) inputSampleR = bridgerectifier;
		else inputSampleR = -bridgerectifier;
		//drive section
		inputSampleR /= gain;
		//end R
		
		//noise shaping to 32-bit floating point
		if (fpFlip) {
			fpTemp = inputSampleL;
			fpNShapeLA = (fpNShapeLA*fpOld)+((inputSampleL-fpTemp)*fpNew);
			inputSampleL += fpNShapeLA;
			fpTemp = inputSampleR;
			fpNShapeRA = (fpNShapeRA*fpOld)+((inputSampleR-fpTemp)*fpNew);
			inputSampleR += fpNShapeRA;
		}
		else {
			fpTemp = inputSampleL;
			fpNShapeLB = (fpNShapeLB*fpOld)+((inputSampleL-fpTemp)*fpNew);
			inputSampleL += fpNShapeLB;
			fpTemp = inputSampleR;
			fpNShapeRB = (fpNShapeRB*fpOld)+((inputSampleR-fpTemp)*fpNew);
			inputSampleR += fpNShapeRB;
		}
		fpFlip = !fpFlip;
		//end noise shaping on 32 bit output

		*out1 = inputSampleL;
		*out2 = inputSampleR;

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

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

	double gain = 0.135;
	double slewgain = 0.208;	
	double prevslew = 0.333;
	double balanceB = 0.0001;
	double overallscale = 1.0;
	overallscale /= 44100.0;
	overallscale *= getSampleRate();
	slewgain *= overallscale;
	prevslew *= overallscale;
	balanceB /= overallscale;
	double balanceA = 1.0 - balanceB;
	double slew;
	double bridgerectifier;
	double combsample;
	
	double fpTemp; //this is different from singlereplacing
	long double fpOld = 0.618033988749894848204586; //golden ratio!
	long double fpNew = 1.0 - fpOld;	

	long double inputSampleL;
	long double inputSampleR;
	long double drySampleL;
	long double drySampleR;
	
    while (--sampleFrames >= 0)
    {
		inputSampleL = *in1;
		inputSampleR = *in2;
		if (inputSampleL<1.2e-38 && -inputSampleL<1.2e-38) {
			static int noisesource = 0;
			//this declares a variable before anything else is compiled. It won't keep assigning
			//it to 0 for every sample, it's as if the declaration doesn't exist in this context,
			//but it lets me add this denormalization fix in a single place rather than updating
			//it in three different locations. The variable isn't thread-safe but this is only
			//a random seed and we can share it with whatever.
			noisesource = noisesource % 1700021; noisesource++;
			int residue = noisesource * noisesource;
			residue = residue % 170003; residue *= residue;
			residue = residue % 17011; residue *= residue;
			residue = residue % 1709; residue *= residue;
			residue = residue % 173; residue *= residue;
			residue = residue % 17;
			double applyresidue = residue;
			applyresidue *= 0.00000001;
			applyresidue *= 0.00000001;
			inputSampleL = applyresidue;
		}
		if (inputSampleR<1.2e-38 && -inputSampleR<1.2e-38) {
			static int noisesource = 0;
			noisesource = noisesource % 1700021; noisesource++;
			int residue = noisesource * noisesource;
			residue = residue % 170003; residue *= residue;
			residue = residue % 17011; residue *= residue;
			residue = residue % 1709; residue *= residue;
			residue = residue % 173; residue *= residue;
			residue = residue % 17;
			double applyresidue = residue;
			applyresidue *= 0.00000001;
			applyresidue *= 0.00000001;
			inputSampleR = applyresidue;
			//this denormalization routine produces a white noise at -300 dB which the noise
			//shaping will interact with to produce a bipolar output, but the noise is actually
			//all positive. That should stop any variables from going denormal, and the routine
			//only kicks in if digital black is input. As a final touch, if you save to 24-bit
			//the silence will return to being digital black again.
		}
		drySampleL = inputSampleL;
		drySampleR = inputSampleR;

		//begin L
		slew = inputSampleL - lastSampleL;
		lastSampleL = inputSampleL;
		//Set up direct reference for slew
		
		bridgerectifier = fabs(slew*slewgain);
		if (bridgerectifier > 1.57079633) bridgerectifier = 1.0;
		else bridgerectifier = sin(bridgerectifier);
		if (slew > 0) slew = bridgerectifier/slewgain;
		else slew = -(bridgerectifier/slewgain);
		
		inputSampleL = (lastOutSampleL*balanceA) + (lastSampleL*balanceB) + slew;
		//go from last slewed, but include some raw values
		lastOutSampleL = inputSampleL;
		//Set up slewed reference
		
		combsample = fabs(drySampleL*lastSampleL);
		if (combsample > 1.0) combsample = 1.0;
		//bailout for very high input gains
		inputSampleL -= (lastSlewL * combsample * prevslew);
		lastSlewL = slew;
		//slew interaction with previous slew
		
		inputSampleL *= gain;
		bridgerectifier = fabs(inputSampleL);
		if (bridgerectifier > 1.57079633) bridgerectifier = 1.0;
		else bridgerectifier = sin(bridgerectifier);
		
		if (inputSampleL > 0) inputSampleL = bridgerectifier;
		else inputSampleL = -bridgerectifier;
		//drive section
		inputSampleL /= gain;
		//end L
		
		//begin R
		slew = inputSampleR - lastSampleR;
		lastSampleR = inputSampleR;
		//Set up direct reference for slew
		
		bridgerectifier = fabs(slew*slewgain);
		if (bridgerectifier > 1.57079633) bridgerectifier = 1.0;
		else bridgerectifier = sin(bridgerectifier);
		if (slew > 0) slew = bridgerectifier/slewgain;
		else slew = -(bridgerectifier/slewgain);
		
		inputSampleR = (lastOutSampleR*balanceA) + (lastSampleR*balanceB) + slew;
		//go from last slewed, but include some raw values
		lastOutSampleR = inputSampleR;
		//Set up slewed reference
		
		combsample = fabs(drySampleR*lastSampleR);
		if (combsample > 1.0) combsample = 1.0;
		//bailout for very high input gains
		inputSampleR -= (lastSlewR * combsample * prevslew);
		lastSlewR = slew;
		//slew interaction with previous slew
		
		inputSampleR *= gain;
		bridgerectifier = fabs(inputSampleR);
		if (bridgerectifier > 1.57079633) bridgerectifier = 1.0;
		else bridgerectifier = sin(bridgerectifier);
		
		if (inputSampleR > 0) inputSampleR = bridgerectifier;
		else inputSampleR = -bridgerectifier;
		//drive section
		inputSampleR /= gain;
		//end R

		//noise shaping to 64-bit floating point
		if (fpFlip) {
			fpTemp = inputSampleL;
			fpNShapeLA = (fpNShapeLA*fpOld)+((inputSampleL-fpTemp)*fpNew);
			inputSampleL += fpNShapeLA;
			fpTemp = inputSampleR;
			fpNShapeRA = (fpNShapeRA*fpOld)+((inputSampleR-fpTemp)*fpNew);
			inputSampleR += fpNShapeRA;
		}
		else {
			fpTemp = inputSampleL;
			fpNShapeLB = (fpNShapeLB*fpOld)+((inputSampleL-fpTemp)*fpNew);
			inputSampleL += fpNShapeLB;
			fpTemp = inputSampleR;
			fpNShapeRB = (fpNShapeRB*fpOld)+((inputSampleR-fpTemp)*fpNew);
			inputSampleR += fpNShapeRB;
		}
		fpFlip = !fpFlip;
		//end noise shaping on 64 bit output

		*out1 = inputSampleL;
		*out2 = inputSampleR;

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