/*
*	File:		Elliptical.cpp
*	
*	Version:	1.0
* 
*	Created:	2/13/25
*	
*	Copyright:  Copyright © 2025 Airwindows, Airwindows uses the MIT license
* 
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/*=============================================================================
	Elliptical.cpp
	
=============================================================================*/
#include "Elliptical.h"


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

COMPONENT_ENTRY(Elliptical)


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Elliptical::Elliptical
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Elliptical::Elliptical(AudioUnit component)
	: AUEffectBase(component)
{
	CreateElements();
	Globals()->UseIndexedParameters(kNumberOfParameters);
	SetParameter(kParam_A, kDefaultValue_ParamA );
	SetParameter(kParam_B, kDefaultValue_ParamB );
         
#if AU_DEBUG_DISPATCHER
	mDebugDispatcher = new AUDebugDispatcher (this);
#endif
	
}


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



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

	outParameterInfo.flags = 	kAudioUnitParameterFlag_IsWritable
						|		kAudioUnitParameterFlag_IsReadable;
    
    if (inScope == kAudioUnitScope_Global) {
        switch(inParameterID)
        {
            case kParam_A:
                AUBase::FillInParameterName (outParameterInfo, kParameterAName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamA;
                break;
            case kParam_B:
                AUBase::FillInParameterName (outParameterInfo, kParameterBName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamB;
                break;
           default:
                result = kAudioUnitErr_InvalidParameter;
                break;
            }
	} else {
        result = kAudioUnitErr_InvalidParameter;
    }
    


	return result;
}

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

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// state that plugin supports only stereo-in/stereo-out processing
UInt32 Elliptical::SupportedNumChannels(const AUChannelInfo ** outInfo)
{
	if (outInfo != NULL)
	{
		static AUChannelInfo info;
		info.inChannels = 2;
		info.outChannels = 2;
		*outInfo = &info;
	}

	return 1;
}

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

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

#pragma mark ____EllipticalEffectKernel



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Elliptical::EllipticalKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult		Elliptical::Reset(AudioUnitScope inScope, AudioUnitElement inElement)
{
	iirA = 0.0;
	iirB = 0.0;
	iirC = 0.0;
	iirD = 0.0;
	iirE = 0.0;
	iirF = 0.0;
	iirG = 0.0;
	iirH = 0.0;
	fpFlip = true;
	
	fpdL = 1.0; while (fpdL < 16386) fpdL = rand()*UINT32_MAX;
	fpdR = 1.0; while (fpdR < 16386) fpdR = rand()*UINT32_MAX;
	return noErr;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Elliptical::ProcessBufferLists
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
OSStatus		Elliptical::ProcessBufferLists(AudioUnitRenderActionFlags & ioActionFlags,
													const AudioBufferList & inBuffer,
                                                    AudioBufferList & outBuffer,
                                                    UInt32 			inFramesToProcess)
{
	Float32 * inputL = (Float32*)(inBuffer.mBuffers[0].mData);
	Float32 * inputR = (Float32*)(inBuffer.mBuffers[1].mData);
	Float32 * outputL = (Float32*)(outBuffer.mBuffers[0].mData);
	Float32 * outputR = (Float32*)(outBuffer.mBuffers[1].mData);
	UInt32 nSampleFrames = inFramesToProcess;
	double overallscale = 1.0;
	overallscale /= 44100.0;
	overallscale *= GetSampleRate();
	
	double rangescale = 0.1 / overallscale;
	double cutoff = pow(GetParameter( kParam_A ),3);
	double slope = pow(GetParameter( kParam_B ),3) * 6.0;
	double newA = cutoff * rangescale;
	double newB = newA; //other part of interleaved IIR is the same
	double fpOld = 0.618033988749894848204586; //golden ratio!
	double newC = cutoff * rangescale; //first extra pole is the same
	cutoff = (cutoff * fpOld) + (0.00001 * (1.0-fpOld));
	double newD = cutoff * rangescale;
	cutoff = (cutoff * fpOld) + (0.00001 * (1.0-fpOld));
	double newE = cutoff * rangescale;
	cutoff = (cutoff * fpOld) + (0.00001 * (1.0-fpOld));
	double newF = cutoff * rangescale;
	cutoff = (cutoff * fpOld) + (0.00001 * (1.0-fpOld));
	double newG = cutoff * rangescale;
	cutoff = (cutoff * fpOld) + (0.00001 * (1.0-fpOld));
	double newH = cutoff * rangescale;
	//converge toward the unvarying fixed cutoff value
	double polesC = slope; if (slope > 1.0) polesC = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
	double polesD = slope; if (slope > 1.0) polesD = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
	double polesE = slope; if (slope > 1.0) polesE = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
	double polesF = slope; if (slope > 1.0) polesF = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
	double polesG = slope; if (slope > 1.0) polesG = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
	double polesH = slope; if (slope > 1.0) polesH = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
	//each one will either be 0.0, the fractional slope value, or 1
		
	while (nSampleFrames-- > 0) {
		double inputSampleL = *inputL;
		double inputSampleR = *inputR;
		if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpdL * 1.18e-17;
		if (fabs(inputSampleR)<1.18e-23) inputSampleR = fpdR * 1.18e-17;
		
		double mid = inputSampleL + inputSampleR;
		double side = inputSampleL - inputSampleR;
		//assign mid and side.Between these sections, you can do mid/side processing
		double temp = side;
		double correction;
		
		if (fpFlip) {
			iirA = (iirA * (1.0 - newA)) + (temp * newA); temp -= iirA; correction = iirA;
		} else {
			iirB = (iirB * (1.0 - newB)) + (temp * newB); temp -= iirB; correction = iirB;
		}
		iirC = (iirC * (1.0 - newC)) + (temp * newC); temp -= iirC;
		iirD = (iirD * (1.0 - newD)) + (temp * newD); temp -= iirD;
		iirE = (iirE * (1.0 - newE)) + (temp * newE); temp -= iirE;
		iirF = (iirF * (1.0 - newF)) + (temp * newF); temp -= iirF;
		iirG = (iirG * (1.0 - newG)) + (temp * newG); temp -= iirG;
		iirH = (iirH * (1.0 - newH)) + (temp * newH); temp -= iirH;
		//set up all the iir filters in case they are used
		
		if (polesC == 1.0) correction += iirC; if (polesC > 0.0 && polesC < 1.0) correction += (iirC * polesC);
		if (polesD == 1.0) correction += iirD; if (polesD > 0.0 && polesD < 1.0) correction += (iirD * polesD);
		if (polesE == 1.0) correction += iirE; if (polesE > 0.0 && polesE < 1.0) correction += (iirE * polesE);
		if (polesF == 1.0) correction += iirF; if (polesF > 0.0 && polesF < 1.0) correction += (iirF * polesF);
		if (polesG == 1.0) correction += iirG; if (polesG > 0.0 && polesG < 1.0) correction += (iirG * polesG);
		if (polesH == 1.0) correction += iirH; if (polesH > 0.0 && polesH < 1.0) correction += (iirH * polesH);
		//each of these are added directly if they're fully engaged,
		//multiplied by 0-1 if they are the interpolated one, or skipped if they are beyond the interpolated one.
		//the purpose is to do all the math at the floating point exponent nearest to the tiny value in use.
		//also, it's formatted that way to easily substitute the next variable: this could be written as a loop
		//with everything an array value. However, this makes just as much sense for this few poles.
		
		side -= correction;
		fpFlip = !fpFlip;
		
		inputSampleL = (mid+side)/2.0;
		inputSampleR = (mid-side)/2.0;
		//unassign mid and side
		
		//begin 32 bit stereo floating point dither
		int expon; frexpf((float)inputSampleL, &expon);
		fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
		inputSampleL += ((double(fpdL)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
		frexpf((float)inputSampleR, &expon);
		fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
		inputSampleR += ((double(fpdR)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
		//end 32 bit stereo floating point dither
		
		*outputL = inputSampleL;
		*outputR = inputSampleR;
		//direct stereo out
		
		inputL += 1;
		inputR += 1;
		outputL += 1;
		outputR += 1;
	}
	return noErr;
}

