/* ========================================
 *  Console6Buss - Console6Buss.h
 *  Copyright (c) airwindows, Airwindows uses the MIT license
 * ======================================== */

#include "Console6Buss.h"

#ifdef SHR3D_SFX_CORE_AIRWINDOWS

namespace airwinconsolidated::Console6Buss {

void Console6Buss::processBlock(float **inputs, float **outputs, int sampleFrames) 
{
    float* in1  =  inputs[0];
    float* in2  =  inputs[1];
    float* out1 = outputs[0];
    float* out2 = outputs[1];

	double gain = A;
    
    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 (gain != 1.0) {
			inputSampleL *= gain;
			inputSampleR *= gain;
		}
		
		//encode/decode courtesy of torridgristle under the MIT license
		//Inverse Square 1-(1-x)^2 and 1-(1-x)^0.5
		//Reformulated using 'Herbie' for better accuracy near zero
		
		if (inputSampleL > 1.0) inputSampleL = 1.0;
		else if (inputSampleL > 0.0) inputSampleL = inputSampleL / (1.0 + sqrt(1.0 - inputSampleL));
		
		if (inputSampleL < -1.0) inputSampleL = -1.0;
		else if (inputSampleL < 0.0) inputSampleL = inputSampleL / (sqrt((inputSampleL + 1.0)) + 1.0);
		
		if (inputSampleR > 1.0) inputSampleR = 1.0;
		else if (inputSampleR > 0.0) inputSampleR = inputSampleR / (1.0 + sqrt(1.0 - inputSampleR));
		
		if (inputSampleR < -1.0) inputSampleR = -1.0;
		else if (inputSampleR < 0.0) inputSampleR = inputSampleR / (sqrt((inputSampleR + 1.0)) + 1.0);
		
		//begin 32 bit stereo floating point dither
		int expon; frexpf((float)inputSampleL, &expon);
		fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
		inputSampleL += double((double(fpdL)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2.0,expon+62.0));
		frexpf((float)inputSampleR, &expon);
		fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
		inputSampleR += double((double(fpdR)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2.0,expon+62.0));
		//end 32 bit stereo floating point dither
		
		*out1 = float(inputSampleL);
		*out2 = float(inputSampleR);

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

} // end namespace

#endif // SHR3D_SFX_CORE_AIRWINDOWS
