/*
*	File:		Gatelope.cpp
*	
*	Version:	1.0
* 
*	Created:	11/29/18
*	
*	Copyright:  Copyright © 2018 Airwindows, Airwindows uses the MIT license
* 
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/*=============================================================================
	Gatelope.cpp
	
=============================================================================*/
#include "Gatelope.h"


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

AUDIOCOMPONENT_ENTRY(AUBaseFactory, Gatelope)


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


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



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Gatelope::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			Gatelope::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_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamOne;
                break;
            case kParam_Two:
                AUBase::FillInParameterName (outParameterInfo, kParameterTwoName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                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;
           case kParam_Four:
                AUBase::FillInParameterName (outParameterInfo, kParameterFourName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamFour;
                break;
           case kParam_Five:
                AUBase::FillInParameterName (outParameterInfo, kParameterFiveName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamFive;
                break;
           default:
                result = kAudioUnitErr_InvalidParameter;
                break;
            }
	} else {
        result = kAudioUnitErr_InvalidParameter;
    }
    


	return result;
}

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

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

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

#pragma mark ____GatelopeEffectKernel



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Gatelope::GatelopeKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		Gatelope::GatelopeKernel::Reset()
{
	iirLowpassA = 0.0;
	iirLowpassB = 0.0;
	iirHighpassA = 0.0;
	iirHighpassB = 0.0;
	treblefreq = 1.0;
	bassfreq = 0.0;
	flip = false;
	fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Gatelope::GatelopeKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		Gatelope::GatelopeKernel::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();
	//speed settings around release
	Float64 threshold = pow(GetParameter( kParam_One ),2);
	//gain settings around threshold
	Float64 trebledecay = pow(1.0-GetParameter( kParam_Two ),2)/4196.0;
	Float64 bassdecay =  pow(1.0-GetParameter( kParam_Three ),2)/8192.0;
	Float64 slowAttack = (pow(GetParameter( kParam_Four ),3)*3)+0.003;
	Float64 wet = GetParameter( kParam_Five );
	slowAttack /= overallscale;
	trebledecay /= overallscale;
	bassdecay /= overallscale;
	trebledecay += 1.0;
	bassdecay += 1.0;
	Float64 attackSpeed;

	while (nSampleFrames-- > 0) {
		double inputSample = *sourceP;

		if (fabs(inputSample)<1.18e-23) inputSample = fpd * 1.18e-17;
		double drySample = inputSample;
		
		attackSpeed = slowAttack - (fabs(inputSample)*slowAttack*0.5);
		
		if (attackSpeed < 0.0) attackSpeed = 0.0;
		//softening onset click depending on how hard we're getting it
		
		if (flip)
		{
			if (fabs(inputSample) > threshold)
			{
				treblefreq += attackSpeed;
				if (treblefreq > 2.0) treblefreq = 2.0;
				bassfreq -= attackSpeed;
				bassfreq -= attackSpeed;
				if (bassfreq < 0.0) bassfreq = 0.0;
				iirLowpassA = inputSample;
				iirLowpassB = inputSample;
				iirHighpassA = 0.0;
				iirHighpassB = 0.0;
			}
			else
			{
				treblefreq -= bassfreq;
				treblefreq /= trebledecay;
				treblefreq += bassfreq;
				bassfreq -= treblefreq;
				bassfreq /= bassdecay;
				bassfreq += treblefreq;
			}
			
			if (treblefreq >= 1.0) iirLowpassA = inputSample;
			else iirLowpassA = (iirLowpassA * (1.0 - treblefreq)) + (inputSample * treblefreq);
			
			if (bassfreq > 1.0) bassfreq = 1.0;
			
			if (bassfreq > 0.0) iirHighpassA = (iirHighpassA * (1.0 - bassfreq)) + (inputSample * bassfreq);
			else iirHighpassA = 0.0;
			
			if (treblefreq > bassfreq) inputSample = (iirLowpassA - iirHighpassA);
			else inputSample = 0.0;
		}
		else
		{
			if (fabs(inputSample) > threshold)
			{
				treblefreq += attackSpeed;
				if (treblefreq > 2.0) treblefreq = 2.0;
				bassfreq -= attackSpeed;
				bassfreq -= attackSpeed;
				if (bassfreq < 0.0) bassfreq = 0.0;
				iirLowpassA = inputSample;
				iirLowpassB = inputSample;
				iirHighpassA = 0.0;
				iirHighpassB = 0.0;
			}
			else
			{
				treblefreq -= bassfreq;
				treblefreq /= trebledecay;
				treblefreq += bassfreq;
				bassfreq -= treblefreq;
				bassfreq /= bassdecay;
				bassfreq += treblefreq;
			}
			
			if (treblefreq >= 1.0) iirLowpassB = inputSample;
			else iirLowpassB = (iirLowpassB * (1.0 - treblefreq)) + (inputSample * treblefreq);
			
			if (bassfreq > 1.0) bassfreq = 1.0;

			if (bassfreq > 0.0) iirHighpassB = (iirHighpassB * (1.0 - bassfreq)) + (inputSample * bassfreq);
			else iirHighpassB = 0.0;
			
			if (treblefreq > bassfreq) inputSample = (iirLowpassB - iirHighpassB);
			else inputSample = 0.0;
		}
		//done full gated envelope filtered effect
		inputSample  = ((1-wet)*drySample)+(wet*inputSample);
		//we're going to set up a dry/wet control instead of a min. threshold
		
		flip = !flip;
		
		//begin 32 bit floating point dither
		int expon; frexpf((float)inputSample, &expon);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		inputSample += ((double(fpd)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
		//end 32 bit floating point dither
		
		*destP = inputSample;
		
		sourceP += inNumChannels; destP += inNumChannels;
	}
}

