/*
*	File:		Aura.cpp
*	
*	Version:	1.0
* 
*	Created:	10/7/15
*	
*	Copyright:  Copyright © 2015 Airwindows, Airwindows uses the MIT license
* 
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/*=============================================================================
	Aura.cpp
	
=============================================================================*/
#include "Aura.h"


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

AUDIOCOMPONENT_ENTRY(AUBaseFactory, Aura)


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


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



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Aura::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			Aura::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;
			default:
                result = kAudioUnitErr_InvalidParameter;
                break;
		}
	} else {
        result = kAudioUnitErr_InvalidParameter;
    }
    


	return result;
}

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

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

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

#pragma mark ____AuraEffectKernel



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Aura::AuraKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		Aura::AuraKernel::Reset()
{
	for(int count = 0; count < 21; count++) {b[count] = 0.0; f[count] = 0.0;}
	lastSample = 0.0;
	previousVelocity = 0.0;	
	fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Aura::AuraKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		Aura::AuraKernel::Process(	const Float32 	*inSourceP,
                                                    Float32		 	*inDestP,
                                                    UInt32 			inFramesToProcess,
                                                    UInt32			inNumChannels, 
                                                    bool			&ioSilence )
{
	UInt32 nSampleFrames = inFramesToProcess;
	const Float32 *sourceP = inSourceP;
	Float32 *destP = inDestP;
	Float64 correction;
	Float64 accumulatorSample;
	Float64 velocity;
	Float64 trim = GetParameter( kParam_One );
	Float64 wet = GetParameter( kParam_Two );
	//removed unnecessary dry variable
	Float64 overallscale = trim * 10.0;
	Float64 gain = overallscale + (pow(wet,3) * 0.187859642462067);
	trim *= (1.0 - (pow(wet,3) * 0.187859642462067));
	double inputSample;
	Float64 drySample;
	
	if (gain < 1.0) gain = 1.0;
	if (gain > 1.0) {f[0] = 1.0; gain -= 1.0;} else {f[0] = gain; gain = 0.0;}
	if (gain > 1.0) {f[1] = 1.0; gain -= 1.0;} else {f[1] = gain; gain = 0.0;}
	if (gain > 1.0) {f[2] = 1.0; gain -= 1.0;} else {f[2] = gain; gain = 0.0;}
	if (gain > 1.0) {f[3] = 1.0; gain -= 1.0;} else {f[3] = gain; gain = 0.0;}
	if (gain > 1.0) {f[4] = 1.0; gain -= 1.0;} else {f[4] = gain; gain = 0.0;}
	if (gain > 1.0) {f[5] = 1.0; gain -= 1.0;} else {f[5] = gain; gain = 0.0;}
	if (gain > 1.0) {f[6] = 1.0; gain -= 1.0;} else {f[6] = gain; gain = 0.0;}
	if (gain > 1.0) {f[7] = 1.0; gain -= 1.0;} else {f[7] = gain; gain = 0.0;}
	if (gain > 1.0) {f[8] = 1.0; gain -= 1.0;} else {f[8] = gain; gain = 0.0;}
	if (gain > 1.0) {f[9] = 1.0; gain -= 1.0;} else {f[9] = gain; gain = 0.0;}
	if (gain > 1.0) {f[10] = 1.0; gain -= 1.0;} else {f[10] = gain; gain = 0.0;}
	if (gain > 1.0) {f[11] = 1.0; gain -= 1.0;} else {f[11] = gain; gain = 0.0;}
	if (gain > 1.0) {f[12] = 1.0; gain -= 1.0;} else {f[12] = gain; gain = 0.0;}
	if (gain > 1.0) {f[13] = 1.0; gain -= 1.0;} else {f[13] = gain; gain = 0.0;}
	if (gain > 1.0) {f[14] = 1.0; gain -= 1.0;} else {f[14] = gain; gain = 0.0;}
	if (gain > 1.0) {f[15] = 1.0; gain -= 1.0;} else {f[15] = gain; gain = 0.0;}
	if (gain > 1.0) {f[16] = 1.0; gain -= 1.0;} else {f[16] = gain; gain = 0.0;}
	if (gain > 1.0) {f[17] = 1.0; gain -= 1.0;} else {f[17] = gain; gain = 0.0;}
	if (gain > 1.0) {f[18] = 1.0; gain -= 1.0;} else {f[18] = gain; gain = 0.0;}
	if (gain > 1.0) {f[19] = 1.0; gain -= 1.0;} else {f[19] = gain; gain = 0.0;}
	
	//there, now we have a neat little moving average with remainders
	
	if (overallscale < 1.0) overallscale = 1.0;
	f[0] /= overallscale;
	f[1] /= overallscale;
	f[2] /= overallscale;
	f[3] /= overallscale;
	f[4] /= overallscale;
	f[5] /= overallscale;
	f[6] /= overallscale;
	f[7] /= overallscale;
	f[8] /= overallscale;
	f[9] /= overallscale;
	f[10] /= overallscale;
	f[11] /= overallscale;
	f[12] /= overallscale;
	f[13] /= overallscale;
	f[14] /= overallscale;
	f[15] /= overallscale;
	f[16] /= overallscale;
	f[17] /= overallscale;
	f[18] /= overallscale;
	f[19] /= overallscale;
	//and now it's neatly scaled, too
	
	while (nSampleFrames-- > 0) {
		inputSample = *sourceP;
		if (fabs(inputSample)<1.18e-23) inputSample = fpd * 1.18e-17;
		drySample = inputSample;
		
		velocity = lastSample - inputSample;
		correction = previousVelocity - velocity;
		
		b[19] = b[18]; b[18] = b[17]; b[17] = b[16]; b[16] = b[15];
		b[15] = b[14]; b[14] = b[13]; b[13] = b[12]; b[12] = b[11];
		b[11] = b[10]; b[10] = b[9];
		b[9] = b[8]; b[8] = b[7]; b[7] = b[6]; b[6] = b[5];
		b[5] = b[4]; b[4] = b[3]; b[3] = b[2]; b[2] = b[1];
		b[1] = b[0]; b[0] = accumulatorSample = correction;
		
		//we are accumulating rates of change of the rate of change
		
		accumulatorSample *= f[0];
		accumulatorSample += (b[1] * f[1]);
		accumulatorSample += (b[2] * f[2]);
		accumulatorSample += (b[3] * f[3]);
		accumulatorSample += (b[4] * f[4]);
		accumulatorSample += (b[5] * f[5]);
		accumulatorSample += (b[6] * f[6]);
		accumulatorSample += (b[7] * f[7]);
		accumulatorSample += (b[8] * f[8]);
		accumulatorSample += (b[9] * f[9]);
		accumulatorSample += (b[10] * f[10]);
		accumulatorSample += (b[11] * f[11]);
		accumulatorSample += (b[12] * f[12]);
		accumulatorSample += (b[13] * f[13]);
		accumulatorSample += (b[14] * f[14]);
		accumulatorSample += (b[15] * f[15]);
		accumulatorSample += (b[16] * f[16]);
		accumulatorSample += (b[17] * f[17]);
		accumulatorSample += (b[18] * f[18]);
		accumulatorSample += (b[19] * f[19]);
		//we are doing our repetitive calculations on a separate value
		
		velocity = previousVelocity + accumulatorSample;		
		inputSample = lastSample + velocity;
		lastSample = inputSample;
		previousVelocity = -velocity * pow(trim,2);
		
		if (wet !=1.0) {
			inputSample = (inputSample * wet) + (drySample * (1.0-wet));
		}		
		
		//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;
	}
}

