/*
*	File:		Distance3.cpp
*	
*	Version:	1.0
* 
*	Created:	2/23/24
*	
*	Copyright:  Copyright © 2024 Airwindows, Airwindows uses the MIT license
* 
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/*=============================================================================
	Distance3.cpp
	
=============================================================================*/
#include "Distance3.h"


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

COMPONENT_ENTRY(Distance3)


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Distance3::Distance3
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Distance3::Distance3(AudioUnit component)
	: AUEffectBase(component)
{
	CreateElements();
	Globals()->UseIndexedParameters(kNumberOfParameters);
	SetParameter(kParam_One, kDefaultValue_ParamOne );
	SetParameter(kParam_Two, kDefaultValue_ParamTwo );
	SetParameter(kParam_Three, kDefaultValue_ParamThree );
         
#if AU_DEBUG_DISPATCHER
	mDebugDispatcher = new AUDebugDispatcher (this);
#endif
	
}


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Distance3::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			Distance3::GetParameterValueStrings(AudioUnitScope		inScope,
                                                                AudioUnitParameterID	inParameterID,
                                                                CFArrayRef *		outStrings)
{
        
    return kAudioUnitErr_InvalidProperty;
}



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Distance3::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			Distance3::GetParameterInfo(AudioUnitScope		inScope,
                                                        AudioUnitParameterID	inParameterID,
                                                        AudioUnitParameterInfo	&outParameterInfo )
{
	ComponentResult result = noErr;

	outParameterInfo.flags = 	kAudioUnitParameterFlag_IsWritable
						|		kAudioUnitParameterFlag_IsReadable;
    
    if (inScope == kAudioUnitScope_Global) {
        switch(inParameterID)
        {
			case kParam_One:
                AUBase::FillInParameterName (outParameterInfo, kParameterOneName, false);
				outParameterInfo.unit = kAudioUnitParameterUnit_CustomUnit;
				outParameterInfo.unitName = kParameterOneUnit;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 10.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamOne;
                break;
            case kParam_Two:
                AUBase::FillInParameterName (outParameterInfo, kParameterTwoName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 70.0;
                outParameterInfo.maxValue = 140.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamTwo;
                break;
            case kParam_Three:
                AUBase::FillInParameterName (outParameterInfo, kParameterThreeName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamThree;
                break;
           default:
                result = kAudioUnitErr_InvalidParameter;
                break;
            }
	} else {
        result = kAudioUnitErr_InvalidParameter;
    }
    


	return result;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Distance3::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			Distance3::GetPropertyInfo (AudioUnitPropertyID	inID,
                                                        AudioUnitScope		inScope,
                                                        AudioUnitElement	inElement,
                                                        UInt32 &		outDataSize,
                                                        Boolean &		outWritable)
{
	return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Distance3::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			Distance3::GetProperty(	AudioUnitPropertyID inID,
                                                        AudioUnitScope 		inScope,
                                                        AudioUnitElement 	inElement,
                                                        void *			outData )
{
	return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}

//	Distance3::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Distance3::Initialize()
{
    ComponentResult result = AUEffectBase::Initialize();
    if (result == noErr)
        Reset(kAudioUnitScope_Global, 0);
    return result;
}

#pragma mark ____Distance3EffectKernel



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Distance3::Distance3Kernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		Distance3::Distance3Kernel::Reset()
{
	prevresultAL = lastclampAL = clampAL = changeAL = lastAL = 0.0;
	prevresultBL = lastclampBL = clampBL = changeBL = lastBL = 0.0;
	prevresultCL = lastclampCL = clampCL = changeCL = lastCL = 0.0;

	for(int count = 0; count < dscBuf+2; count++) {
		dBaL[count] = 0.0;
		dBbL[count] = 0.0;
		dBcL[count] = 0.0;
	}
	dBaPosL = 0.0;
	dBbPosL = 0.0;
	dBcPosL = 0.0;
	dBaXL = 1;
	dBbXL = 1;
	dBcXL = 1;
	
	fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Distance3::Distance3Kernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		Distance3::Distance3Kernel::Process(	const Float32 	*inSourceP,
                                                    Float32		 	*inDestP,
                                                    UInt32 			inFramesToProcess,
                                                    UInt32			inNumChannels, 
                                                    bool			&ioSilence )
{
	UInt32 nSampleFrames = inFramesToProcess;
	const Float32 *sourceP = inSourceP;
	Float32 *destP = inDestP;
	double overallscale = 1.0;
	overallscale /= 44100.0;
	overallscale *= GetSampleRate();

	double softslew = (GetParameter( kParam_One )*10.0)+0.5;
	softslew *= overallscale;
	double outslew = softslew * (1.0-(GetParameter( kParam_One )*0.0333));
	double refdB = GetParameter( kParam_Two );
	double topdB = 0.000000075 * pow(10.0,refdB/20.0) * overallscale;
	double wet = GetParameter( kParam_Three );
	
	while (nSampleFrames-- > 0) {
		double inputSampleL = *sourceP;
		if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpd * 1.18e-17;
		double drySampleL = inputSampleL;
		
		inputSampleL *= softslew;
		lastclampAL = clampAL; clampAL = inputSampleL - lastAL;
		double postfilter = changeAL = fabs(clampAL - lastclampAL);
		postfilter += (softslew / 2.0);
		inputSampleL /= outslew;
		inputSampleL += (prevresultAL * postfilter);
		inputSampleL /= (postfilter + 1.0);
		prevresultAL = inputSampleL;
		//do an IIR like thing to further squish superdistant stuff
		
		inputSampleL *= topdB;
		if (inputSampleL < -0.222) inputSampleL = -0.222; if (inputSampleL > 0.222) inputSampleL = 0.222;
		//Air Discontinuity A begin
		dBaL[dBaXL] = inputSampleL; dBaPosL *= 0.5; dBaPosL += fabs((inputSampleL*((inputSampleL*0.25)-0.5))*0.5);
		int dBdly = floor(dBaPosL*dscBuf);
		double dBi = (dBaPosL*dscBuf)-dBdly;
		inputSampleL = dBaL[dBaXL-dBdly +((dBaXL-dBdly < 0)?dscBuf:0)]*(1.0-dBi);
		dBdly++; inputSampleL += dBaL[dBaXL-dBdly +((dBaXL-dBdly < 0)?dscBuf:0)]*dBi;
		dBaXL++; if (dBaXL < 0 || dBaXL >= dscBuf) dBaXL = 0;
		//Air Discontinuity A end
		inputSampleL /= topdB;
		
		inputSampleL *= softslew;
		lastclampBL = clampBL; clampBL = inputSampleL - lastBL;
		postfilter = changeBL = fabs(clampBL - lastclampBL);
		postfilter += (softslew / 2.0);
		lastBL = inputSampleL;
		inputSampleL /= outslew;
		inputSampleL += (prevresultBL * postfilter);
		inputSampleL /= (postfilter + 1.0);
		prevresultBL = inputSampleL;
		//do an IIR like thing to further squish superdistant stuff
		
		inputSampleL *= topdB;
		if (inputSampleL < -0.222) inputSampleL = -0.222; if (inputSampleL > 0.222) inputSampleL = 0.222;
		//Air Discontinuity B begin
		dBbL[dBbXL] = inputSampleL;  dBbPosL *= 0.5; dBbPosL += fabs((inputSampleL*((inputSampleL*0.25)-0.5))*0.5);
		dBdly = floor(dBbPosL*dscBuf); dBi = (dBbPosL*dscBuf)-dBdly;
		inputSampleL = dBbL[dBbXL-dBdly +((dBbXL-dBdly < 0)?dscBuf:0)]*(1.0-dBi);
		dBdly++; inputSampleL += dBbL[dBbXL-dBdly +((dBbXL-dBdly < 0)?dscBuf:0)]*dBi;
		dBbXL++; if (dBbXL < 0 || dBbXL >= dscBuf) dBbXL = 0;
		//Air Discontinuity B end
		inputSampleL /= topdB;
		
		inputSampleL *= softslew;
		lastclampCL = clampCL; clampCL = inputSampleL - lastCL;
		postfilter = changeCL = fabs(clampCL - lastclampCL);
		postfilter += (softslew / 2.0);
		lastCL = inputSampleL;
		inputSampleL /= softslew; //don't boost the final time!
		inputSampleL += (prevresultCL * postfilter);
		inputSampleL /= (postfilter + 1.0);
		prevresultCL = inputSampleL;
		//do an IIR like thing to further squish superdistant stuff
		
		inputSampleL *= topdB;
		if (inputSampleL < -0.222) inputSampleL = -0.222; if (inputSampleL > 0.222) inputSampleL = 0.222;		
		//Air Discontinuity C begin
		dBcL[dBcXL] = inputSampleL;  dBcPosL *= 0.5; dBcPosL += fabs((inputSampleL*((inputSampleL*0.25)-0.5))*0.5);
		dBdly = floor(dBcPosL*dscBuf); dBi = (dBcPosL*dscBuf)-dBdly;
		inputSampleL = dBcL[dBcXL-dBdly +((dBcXL-dBdly < 0)?dscBuf:0)]*(1.0-dBi);
		dBdly++; inputSampleL += dBcL[dBcXL-dBdly +((dBcXL-dBdly < 0)?dscBuf:0)]*dBi;
		dBcXL++; if (dBcXL < 0 || dBcXL >= dscBuf) dBcXL = 0;
		//Air Discontinuity C end
		inputSampleL /= topdB;
		
		if (wet < 1.0) inputSampleL = (drySampleL * (1.0-wet))+(inputSampleL*wet);
		
		//begin 32 bit floating point dither
		int expon; frexpf((float)inputSampleL, &expon);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		inputSampleL += ((double(fpd)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
		//end 32 bit floating point dither
		
		*destP = inputSampleL;
		
		sourceP += inNumChannels; destP += inNumChannels;
	}
}

