/* ========================================
 *  Console5Buss - Console5Buss.h
 *  Copyright (c) 2016 airwindows, All rights reserved
 * ======================================== */

#ifndef __Console5Buss_H
#include "Console5Buss.h"
#endif

void Console5Buss::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 inputgain = A;
	double differenceL;
	double differenceR;
	double nearZeroL;
	double nearZeroR;
	double servoTrim = 0.0000001 / overallscale;
	double bassTrim = 0.005 / overallscale;
	long double inputSampleL;
	long double inputSampleR;
	
	if (settingchase != inputgain) {
		chasespeed *= 2.0;
		settingchase = inputgain;
	}
	if (chasespeed > 2500.0) chasespeed = 2500.0;
	if (gainchase < 0.0) gainchase = inputgain;
	
    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.
		}
		
		chasespeed *= 0.9999;
		chasespeed -= 0.01;
		if (chasespeed < 350.0) chasespeed = 350.0;
		//we have our chase speed compensated for recent fader activity
		
		gainchase = (((gainchase*chasespeed)+inputgain)/(chasespeed+1.0));
		//gainchase is chasing the target, as a simple multiply gain factor
		
		if (1.0 != gainchase) {
			inputSampleL *= gainchase;
			inputSampleR *= gainchase;
		}
		//done with trim control
		
		if (inputSampleL > 1.0) inputSampleL = 1.0;
		if (inputSampleL < -1.0) inputSampleL = -1.0;
		inputSampleL = asin(inputSampleL);
		//amplitude aspect

		if (inputSampleR > 1.0) inputSampleR = 1.0;
		if (inputSampleR < -1.0) inputSampleR = -1.0;
		inputSampleR = asin(inputSampleR);
		//amplitude aspect
		
		differenceL = lastSampleBussL - inputSampleL;
		differenceR = lastSampleBussR - inputSampleR;
		lastSampleBussL = inputSampleL;
		lastSampleBussR = inputSampleR;
		//derive slew part off direct sample measurement + from last time
		
		if (differenceL > 1.57079633) differenceL = 1.57079633;
		if (differenceL < -1.57079633) differenceL = -1.57079633;
		if (differenceR > 1.57079633) differenceR = 1.57079633;
		if (differenceR < -1.57079633) differenceR = -1.57079633;

		differenceL = lastFXBussL + sin(differenceL);
		differenceR = lastFXBussR + sin(differenceR);
		//we're about to use this twice and then not use difference again, so we'll reuse it
		//enhance slew is arcsin(): cutting it back is sin()
		
		iirCorrectL += inputSampleL - differenceL;
		iirCorrectR += inputSampleR - differenceR;
		inputSampleL = differenceL;
		inputSampleR = differenceR;
		//apply the slew to stored value: can develop DC offsets.
		//store the change we made so we can dial it back
				
		lastFXBussL = inputSampleL;		
		lastFXBussR = inputSampleR;		
		if (lastFXBussL > 1.0) lastFXBussL = 1.0;
		if (lastFXBussL < -1.0) lastFXBussL = -1.0;
		if (lastFXBussR > 1.0) lastFXBussR = 1.0;
		if (lastFXBussR < -1.0) lastFXBussR = -1.0;
		//build new signal off what was present in output last time
		
		nearZeroL = pow(fabs(fabs(lastFXBussL)-1.0), 2);
		nearZeroR = pow(fabs(fabs(lastFXBussR)-1.0), 2);
		//if the sample is very near zero this number is higher.
		if (iirCorrectL > 0) iirCorrectL -= servoTrim;
		if (iirCorrectL < 0) iirCorrectL += servoTrim;
		if (iirCorrectR > 0) iirCorrectR -= servoTrim;
		if (iirCorrectR < 0) iirCorrectR += servoTrim;
		//cut back the servo by which we're pulling back the DC
		lastFXBussL += (iirCorrectL * 0.0000005);
		lastFXBussR += (iirCorrectR * 0.0000005);
		//apply the servo to the stored value, pulling back the DC
		lastFXBussL *= (1.0 - (nearZeroL * bassTrim));
		lastFXBussR *= (1.0 - (nearZeroR * bassTrim));
		//this cuts back the DC offset directly, relative to how near zero we are
		
		//stereo 32 bit dither, made small and tidy.
		int expon; frexpf((float)inputSampleL, &expon);
		long double dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
		inputSampleL += (dither-fpNShapeL); fpNShapeL = dither;
		frexpf((float)inputSampleR, &expon);
		dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
		inputSampleR += (dither-fpNShapeR); fpNShapeR = dither;
		//end 32 bit dither

		*out1 = inputSampleL;
		*out2 = inputSampleR;

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

void Console5Buss::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 inputgain = A;
	double differenceL;
	double differenceR;
	double nearZeroL;
	double nearZeroR;
	double servoTrim = 0.0000001 / overallscale;
	double bassTrim = 0.005 / overallscale;
	long double inputSampleL;
	long double inputSampleR;
	
	if (settingchase != inputgain) {
		chasespeed *= 2.0;
		settingchase = inputgain;
	}
	if (chasespeed > 2500.0) chasespeed = 2500.0;
	if (gainchase < 0.0) gainchase = inputgain;
	
    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.
		}
		
		chasespeed *= 0.9999;
		chasespeed -= 0.01;
		if (chasespeed < 350.0) chasespeed = 350.0;
		//we have our chase speed compensated for recent fader activity
		
		gainchase = (((gainchase*chasespeed)+inputgain)/(chasespeed+1.0));
		//gainchase is chasing the target, as a simple multiply gain factor
		
		if (1.0 != gainchase) {
			inputSampleL *= gainchase;
			inputSampleR *= gainchase;
		}
		//done with trim control
		
		if (inputSampleL > 1.0) inputSampleL = 1.0;
		if (inputSampleL < -1.0) inputSampleL = -1.0;
		inputSampleL = asin(inputSampleL);
		//amplitude aspect
		
		if (inputSampleR > 1.0) inputSampleR = 1.0;
		if (inputSampleR < -1.0) inputSampleR = -1.0;
		inputSampleR = asin(inputSampleR);
		//amplitude aspect
		
		differenceL = lastSampleBussL - inputSampleL;
		differenceR = lastSampleBussR - inputSampleR;
		lastSampleBussL = inputSampleL;
		lastSampleBussR = inputSampleR;
		//derive slew part off direct sample measurement + from last time
		
		if (differenceL > 1.57079633) differenceL = 1.57079633;
		if (differenceL < -1.57079633) differenceL = -1.57079633;
		if (differenceR > 1.57079633) differenceR = 1.57079633;
		if (differenceR < -1.57079633) differenceR = -1.57079633;
		
		differenceL = lastFXBussL + sin(differenceL);
		differenceR = lastFXBussR + sin(differenceR);
		//we're about to use this twice and then not use difference again, so we'll reuse it
		//enhance slew is arcsin(): cutting it back is sin()
		
		iirCorrectL += inputSampleL - differenceL;
		iirCorrectR += inputSampleR - differenceR;
		inputSampleL = differenceL;
		inputSampleR = differenceR;
		//apply the slew to stored value: can develop DC offsets.
		//store the change we made so we can dial it back
		
		lastFXBussL = inputSampleL;		
		lastFXBussR = inputSampleR;		
		if (lastFXBussL > 1.0) lastFXBussL = 1.0;
		if (lastFXBussL < -1.0) lastFXBussL = -1.0;
		if (lastFXBussR > 1.0) lastFXBussR = 1.0;
		if (lastFXBussR < -1.0) lastFXBussR = -1.0;
		//build new signal off what was present in output last time
		
		nearZeroL = pow(fabs(fabs(lastFXBussL)-1.0), 2);
		nearZeroR = pow(fabs(fabs(lastFXBussR)-1.0), 2);
		//if the sample is very near zero this number is higher.
		if (iirCorrectL > 0) iirCorrectL -= servoTrim;
		if (iirCorrectL < 0) iirCorrectL += servoTrim;
		if (iirCorrectR > 0) iirCorrectR -= servoTrim;
		if (iirCorrectR < 0) iirCorrectR += servoTrim;
		//cut back the servo by which we're pulling back the DC
		lastFXBussL += (iirCorrectL * 0.0000005);
		lastFXBussR += (iirCorrectR * 0.0000005);
		//apply the servo to the stored value, pulling back the DC
		lastFXBussL *= (1.0 - (nearZeroL * bassTrim));
		lastFXBussR *= (1.0 - (nearZeroR * bassTrim));
		//this cuts back the DC offset directly, relative to how near zero we are
		
		//stereo 64 bit dither, made small and tidy.
		int expon; frexp((double)inputSampleL, &expon);
		long double dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
		dither /= 536870912.0; //needs this to scale to 64 bit zone
		inputSampleL += (dither-fpNShapeL); fpNShapeL = dither;
		frexp((double)inputSampleR, &expon);
		dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
		dither /= 536870912.0; //needs this to scale to 64 bit zone
		inputSampleR += (dither-fpNShapeR); fpNShapeR = dither;
		//end 64 bit dither
		
		*out1 = inputSampleL;
		*out2 = inputSampleR;

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