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

#ifndef __SingleEndedTriode_H
#include "SingleEndedTriode.h"
#endif

void SingleEndedTriode::processReplacing(float **inputs, float **outputs, VstInt32 sampleFrames) 
{
    float* in1  =  inputs[0];
    float* in2  =  inputs[1];
    float* out1 = outputs[0];
    float* out2 = outputs[1];
	double intensity = pow(A,2)*8.0;
	double triode = intensity;
	intensity +=0.001;
	double softcrossover = pow(B,3)/8.0;
	double hardcrossover = pow(C,7)/8.0;
	double wet = D;
	double dry = 1.0 - wet;
	
    while (--sampleFrames >= 0)
    {
		long double inputSampleL = *in1;
		long double 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.
		}
		double drySampleL = inputSampleL;
		double drySampleR = inputSampleR;
		
		if (triode > 0.0)
		{
			inputSampleL *= intensity;
			inputSampleR *= intensity;
			inputSampleL -= 0.5;
			inputSampleR -= 0.5;
			
			long double bridgerectifier = fabs(inputSampleL);
			if (bridgerectifier > 1.57079633) bridgerectifier = 1.57079633;
			bridgerectifier = sin(bridgerectifier);
			if (inputSampleL > 0) inputSampleL = bridgerectifier;
			else inputSampleL = -bridgerectifier;

			bridgerectifier = fabs(inputSampleR);
			if (bridgerectifier > 1.57079633) bridgerectifier = 1.57079633;
			bridgerectifier = sin(bridgerectifier);
			if (inputSampleR > 0) inputSampleR = bridgerectifier;
			else inputSampleR = -bridgerectifier;

			inputSampleL += postsine;
			inputSampleR += postsine;
			inputSampleL /= intensity;
			inputSampleR /= intensity;
		}
		
		if (softcrossover > 0.0)
		{
			long double bridgerectifier = fabs(inputSampleL);
			if (bridgerectifier > 0.0) bridgerectifier -= (softcrossover*(bridgerectifier+sqrt(bridgerectifier)));
			if (bridgerectifier < 0.0) bridgerectifier = 0;
			if (inputSampleL > 0.0) inputSampleL = bridgerectifier;
			else inputSampleL = -bridgerectifier;				

			bridgerectifier = fabs(inputSampleR);
			if (bridgerectifier > 0.0) bridgerectifier -= (softcrossover*(bridgerectifier+sqrt(bridgerectifier)));
			if (bridgerectifier < 0.0) bridgerectifier = 0;
			if (inputSampleR > 0.0) inputSampleR = bridgerectifier;
			else inputSampleR = -bridgerectifier;				
		}
		
		
		if (hardcrossover > 0.0)
		{
			long double bridgerectifier = fabs(inputSampleL);
			bridgerectifier -= hardcrossover;
			if (bridgerectifier < 0.0) bridgerectifier = 0.0;
			if (inputSampleL > 0.0) inputSampleL = bridgerectifier;
			else inputSampleL = -bridgerectifier;				

			bridgerectifier = fabs(inputSampleR);
			bridgerectifier -= hardcrossover;
			if (bridgerectifier < 0.0) bridgerectifier = 0.0;
			if (inputSampleR > 0.0) inputSampleR = bridgerectifier;
			else inputSampleR = -bridgerectifier;				
		}
		
		if (wet !=1.0) {
			inputSampleL = (inputSampleL * wet) + (drySampleL * dry);
			inputSampleR = (inputSampleR * wet) + (drySampleR * dry);
		}
		
		//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 SingleEndedTriode::processDoubleReplacing(double **inputs, double **outputs, VstInt32 sampleFrames) 
{
    double* in1  =  inputs[0];
    double* in2  =  inputs[1];
    double* out1 = outputs[0];
    double* out2 = outputs[1];
	double intensity = pow(A,2)*8.0;
	double triode = intensity;
	intensity +=0.001;
	double softcrossover = pow(B,3)/8.0;
	double hardcrossover = pow(C,7)/8.0;
	double wet = D;
	double dry = 1.0 - wet;

    while (--sampleFrames >= 0)
    {
		long double inputSampleL = *in1;
		long double 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.
		}
		double drySampleL = inputSampleL;
		double drySampleR = inputSampleR;
		
		if (triode > 0.0)
		{
			inputSampleL *= intensity;
			inputSampleR *= intensity;
			inputSampleL -= 0.5;
			inputSampleR -= 0.5;
			
			long double bridgerectifier = fabs(inputSampleL);
			if (bridgerectifier > 1.57079633) bridgerectifier = 1.57079633;
			bridgerectifier = sin(bridgerectifier);
			if (inputSampleL > 0) inputSampleL = bridgerectifier;
			else inputSampleL = -bridgerectifier;
			
			bridgerectifier = fabs(inputSampleR);
			if (bridgerectifier > 1.57079633) bridgerectifier = 1.57079633;
			bridgerectifier = sin(bridgerectifier);
			if (inputSampleR > 0) inputSampleR = bridgerectifier;
			else inputSampleR = -bridgerectifier;
			
			inputSampleL += postsine;
			inputSampleR += postsine;
			inputSampleL /= intensity;
			inputSampleR /= intensity;
		}
		
		if (softcrossover > 0.0)
		{
			long double bridgerectifier = fabs(inputSampleL);
			if (bridgerectifier > 0.0) bridgerectifier -= (softcrossover*(bridgerectifier+sqrt(bridgerectifier)));
			if (bridgerectifier < 0.0) bridgerectifier = 0;
			if (inputSampleL > 0.0) inputSampleL = bridgerectifier;
			else inputSampleL = -bridgerectifier;				
			
			bridgerectifier = fabs(inputSampleR);
			if (bridgerectifier > 0.0) bridgerectifier -= (softcrossover*(bridgerectifier+sqrt(bridgerectifier)));
			if (bridgerectifier < 0.0) bridgerectifier = 0;
			if (inputSampleR > 0.0) inputSampleR = bridgerectifier;
			else inputSampleR = -bridgerectifier;				
		}
		
		
		if (hardcrossover > 0.0)
		{
			long double bridgerectifier = fabs(inputSampleL);
			bridgerectifier -= hardcrossover;
			if (bridgerectifier < 0.0) bridgerectifier = 0.0;
			if (inputSampleL > 0.0) inputSampleL = bridgerectifier;
			else inputSampleL = -bridgerectifier;				
			
			bridgerectifier = fabs(inputSampleR);
			bridgerectifier -= hardcrossover;
			if (bridgerectifier < 0.0) bridgerectifier = 0.0;
			if (inputSampleR > 0.0) inputSampleR = bridgerectifier;
			else inputSampleR = -bridgerectifier;				
		}
		
		if (wet !=1.0) {
			inputSampleL = (inputSampleL * wet) + (drySampleL * dry);
			inputSampleR = (inputSampleR * wet) + (drySampleR * dry);
		}
		
		//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++;
    }
}