/* ========================================
 *  Mackity - Mackity.h
 *  Copyright (c) 2016 airwindows, Airwindows uses the MIT license
 * ======================================== */

#include "Mackity.h"

#ifdef SHR3D_SFX_CORE_AIRWINDOWS

namespace airwinconsolidated::Mackity {

void Mackity::processBlock(float **inputs, float **outputs, int 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 inTrim = A*10.0;
	double outPad = B;
	inTrim *= inTrim;
	
	double iirAmountA = 0.001860867/overallscale;
	double iirAmountB = 0.000287496/overallscale;
	
	biquadB[0] = biquadA[0] = 19160.0 / getSampleRate();
    biquadA[1] = 0.431684981684982;
	biquadB[1] = 1.1582298;
	
	double K = tan(M_PI * biquadA[0]); //lowpass
	double norm = 1.0 / (1.0 + K / biquadA[1] + K * K);
	biquadA[2] = K * K * norm;
	biquadA[3] = 2.0 * biquadA[2];
	biquadA[4] = biquadA[2];
	biquadA[5] = 2.0 * (K * K - 1.0) * norm;
	biquadA[6] = (1.0 - K / biquadA[1] + K * K) * norm;
	
	K = tan(M_PI * biquadB[0]);
	norm = 1.0 / (1.0 + K / biquadB[1] + K * K);
	biquadB[2] = K * K * norm;
	biquadB[3] = 2.0 * biquadB[2];
	biquadB[4] = biquadB[2];
	biquadB[5] = 2.0 * (K * K - 1.0) * norm;
	biquadB[6] = (1.0 - K / biquadB[1] + K * K) * norm;
	
    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 (fabs(iirSampleAL)<1.18e-37) iirSampleAL = 0.0;
		iirSampleAL = (iirSampleAL * (1.0 - iirAmountA)) + (inputSampleL * iirAmountA);
		inputSampleL -= iirSampleAL;
		if (fabs(iirSampleAR)<1.18e-37) iirSampleAR = 0.0;
		iirSampleAR = (iirSampleAR * (1.0 - iirAmountA)) + (inputSampleR * iirAmountA);
		inputSampleR -= iirSampleAR;
		
		if (inTrim != 1.0) {inputSampleL *= inTrim; inputSampleR *= inTrim;}
		
		double outSampleL = biquadA[2]*inputSampleL+biquadA[3]*biquadA[7]+biquadA[4]*biquadA[8]-biquadA[5]*biquadA[9]-biquadA[6]*biquadA[10];
		biquadA[8] = biquadA[7]; biquadA[7] = inputSampleL; inputSampleL = outSampleL; biquadA[10] = biquadA[9]; biquadA[9] = inputSampleL; //DF1 left
		
		double outSampleR = biquadA[2]*inputSampleR+biquadA[3]*biquadA[11]+biquadA[4]*biquadA[12]-biquadA[5]*biquadA[13]-biquadA[6]*biquadA[14];
		biquadA[12] = biquadA[11]; biquadA[11] = inputSampleR; inputSampleR = outSampleR; biquadA[14] = biquadA[13]; biquadA[13] = inputSampleR; //DF1 right
		
		if (inputSampleL > 1.0) inputSampleL = 1.0;
		if (inputSampleL < -1.0) inputSampleL = -1.0;
		inputSampleL -= pow(inputSampleL,5)*0.1768;
		if (inputSampleR > 1.0) inputSampleR = 1.0;
		if (inputSampleR < -1.0) inputSampleR = -1.0;
		inputSampleR -= pow(inputSampleR,5)*0.1768;
		
		outSampleL = biquadB[2]*inputSampleL+biquadB[3]*biquadB[7]+biquadB[4]*biquadB[8]-biquadB[5]*biquadB[9]-biquadB[6]*biquadB[10];
		biquadB[8] = biquadB[7]; biquadB[7] = inputSampleL; inputSampleL = outSampleL; biquadB[10] = biquadB[9]; biquadB[9] = inputSampleL; //DF1 left
		
		outSampleR = biquadB[2]*inputSampleR+biquadB[3]*biquadB[11]+biquadB[4]*biquadB[12]-biquadB[5]*biquadB[13]-biquadB[6]*biquadB[14];
		biquadB[12] = biquadB[11]; biquadB[11] = inputSampleR; inputSampleR = outSampleR; biquadB[14] = biquadB[13]; biquadB[13] = inputSampleR; //DF1 right
		
		if (fabs(iirSampleBL)<1.18e-37) iirSampleBL = 0.0;
		iirSampleBL = (iirSampleBL * (1.0 - iirAmountB)) + (inputSampleL * iirAmountB);
		inputSampleL -= iirSampleBL;
		if (fabs(iirSampleBR)<1.18e-37) iirSampleBR = 0.0;
		iirSampleBR = (iirSampleBR * (1.0 - iirAmountB)) + (inputSampleR * iirAmountB);
		inputSampleR -= iirSampleBR;
		
		if (outPad != 1.0) {inputSampleL *= outPad; inputSampleR *= outPad;}
		
		//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
