/*
*	File:		PearEQ.cpp
*	
*	Version:	1.0
* 
*	Created:	10/1/25
*	
*	Copyright:  Copyright © 2025 Airwindows, Airwindows uses the MIT license
* 
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/*=============================================================================
	PearEQ.cpp
	
=============================================================================*/
#include "PearEQ.h"


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

COMPONENT_ENTRY(PearEQ)


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	PearEQ::PearEQ
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PearEQ::PearEQ(AudioUnit component)
	: AUEffectBase(component)
{
	CreateElements();
	Globals()->UseIndexedParameters(kNumberOfParameters);
	SetParameter(kParam_A, kDefaultValue_ParamA );
	SetParameter(kParam_B, kDefaultValue_ParamB );
	SetParameter(kParam_C, kDefaultValue_ParamC );
	SetParameter(kParam_D, kDefaultValue_ParamD );
	SetParameter(kParam_E, kDefaultValue_ParamE );
	SetParameter(kParam_F, kDefaultValue_ParamF );
         
#if AU_DEBUG_DISPATCHER
	mDebugDispatcher = new AUDebugDispatcher (this);
#endif
	
}


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



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	PearEQ::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			PearEQ::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;
            case kParam_C:
                AUBase::FillInParameterName (outParameterInfo, kParameterCName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamC;
                break;
            case kParam_D:
                AUBase::FillInParameterName (outParameterInfo, kParameterDName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamD;
                break;
            case kParam_E:
                AUBase::FillInParameterName (outParameterInfo, kParameterEName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamE;
                break;
            case kParam_F:
                AUBase::FillInParameterName (outParameterInfo, kParameterFName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamF;
                break;
           default:
                result = kAudioUnitErr_InvalidParameter;
                break;
            }
	} else {
        result = kAudioUnitErr_InvalidParameter;
    }
    


	return result;
}

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

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

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

#pragma mark ____PearEQEffectKernel



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	PearEQ::PearEQKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		PearEQ::PearEQKernel::Reset()
{
	for (int x = 0; x < pear_total; x++) {
		pearA[x] = 0.0;
		pearB[x] = 0.0;
		pearC[x] = 0.0;
		pearD[x] = 0.0;
		pearE[x] = 0.0;
	}
	
	fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	PearEQ::PearEQKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		PearEQ::PearEQKernel::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 topLevl = sqrt(GetParameter( kParam_A )+0.5);
	pearA[levl] = sqrt(GetParameter( kParam_B )+0.5);
	pearB[levl] = sqrt(GetParameter( kParam_C )+0.5);
	pearC[levl] = sqrt(GetParameter( kParam_D )+0.5);
	pearD[levl] = sqrt(GetParameter( kParam_E )+0.5);
	pearE[levl] = sqrt(GetParameter( kParam_F )+0.5);
	
	double freqFactor = sqrt(overallscale)+(overallscale*0.5);
	pearA[freq] = pow(0.564,freqFactor+0.85);
	pearB[freq] = pow(0.564,freqFactor+1.9);
	pearC[freq] = pow(0.564,freqFactor+4.1);
	pearD[freq] = pow(0.564,freqFactor+6.2);
	pearE[freq] = pow(0.564,freqFactor+7.7);
	
	while (nSampleFrames-- > 0) {
		double inputSampleL = *sourceP;
		if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpd * 1.18e-17;
		
		for (int x = 0; x < pear_max; x += 2) {
			//begin Pear filter stages
			pearA[figL] = inputSampleL;
			pearA[slew] = ((pearA[figL]-pearA[x])+pearA[x+1])*pearA[freq]*0.5;
			pearA[x] = pearA[figL] = (pearA[freq]*pearA[figL])+((1.0-pearA[freq])*(pearA[x]+pearA[x+1]));
			pearA[x+1] = pearA[slew];
			inputSampleL -= pearA[figL];
			
			pearB[figL] = pearA[figL];
			pearB[slew] = ((pearB[figL]-pearB[x])+pearB[x+1])*pearB[freq]*0.5;
			pearB[x] = pearB[figL] = (pearB[freq]*pearA[figL])+((1.0-pearB[freq])*(pearB[x]+pearB[x+1]));
			pearB[x+1] = pearB[slew];
			pearA[figL] -= pearB[figL];
			
			pearC[figL] = pearB[figL];
			pearC[slew] = ((pearC[figL]-pearC[x])+pearC[x+1])*pearC[freq]*0.5;
			pearC[x] = pearC[figL] = (pearC[freq]*pearB[figL])+((1.0-pearC[freq])*(pearC[x]+pearC[x+1]));
			pearC[x+1] = pearC[slew];
			pearB[figL] -= pearC[figL];
			
			pearD[figL] = pearC[figL];
			pearD[slew] = ((pearD[figL]-pearD[x])+pearD[x+1])*pearD[freq]*0.5;
			pearD[x] = pearD[figL] = (pearD[freq]*pearC[figL])+((1.0-pearD[freq])*(pearD[x]+pearD[x+1]));
			pearD[x+1] = pearD[slew];
			pearC[figL] -= pearD[figL];
			
			pearE[figL] = pearD[figL];
			pearE[slew] = ((pearE[figL]-pearE[x])+pearE[x+1])*pearE[freq]*0.5;
			pearE[x] = pearE[figL] = (pearE[freq]*pearD[figL])+((1.0-pearE[freq])*(pearE[x]+pearE[x+1]));
			pearE[x+1] = pearE[slew];
			pearD[figL] -= pearE[figL];
			
			inputSampleL *= topLevl;
			inputSampleL += (pearA[figL]*pearA[levl]);
			inputSampleL += (pearB[figL]*pearB[levl]);
			inputSampleL += (pearC[figL]*pearC[levl]);
			inputSampleL += (pearD[figL]*pearD[levl]);
			inputSampleL += (pearE[figL]*pearE[levl]);
		}
		
		//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;
	}
}

