/*
*	File:		IronOxideClassic.cpp
*	
*	Version:	1.0
* 
*	Created:	5/13/17
*	
*	Copyright:  Copyright © 2017 Airwindows, Airwindows uses the MIT license
* 
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/*=============================================================================
	IronOxideClassic.cpp
	
=============================================================================*/
#include "IronOxideClassic.h"


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

COMPONENT_ENTRY(IronOxideClassic)


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	IronOxideClassic::IronOxideClassic
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
IronOxideClassic::IronOxideClassic(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
	
}


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



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	IronOxideClassic::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			IronOxideClassic::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_Decibels;
                outParameterInfo.minValue = -18.0;
                outParameterInfo.maxValue = 18.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamOne;
                break;
            case kParam_Two:
                AUBase::FillInParameterName (outParameterInfo, kParameterTwoName, false);
				outParameterInfo.unit = kAudioUnitParameterUnit_CustomUnit;
				outParameterInfo.flags |= kAudioUnitParameterFlag_DisplayLogarithmic;
				outParameterInfo.unitName = kParameterTwoUnit;
				outParameterInfo.minValue = 1.5;
                outParameterInfo.maxValue = 150.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamTwo;
                break;
            case kParam_Three:
                AUBase::FillInParameterName (outParameterInfo, kParameterThreeName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Decibels;
                outParameterInfo.minValue = -18.0;
                outParameterInfo.maxValue = 18.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamThree;
                break;
			default:
                result = kAudioUnitErr_InvalidParameter;
                break;
		}
	} else {
        result = kAudioUnitErr_InvalidParameter;
    }
    


	return result;
}

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

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

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

#pragma mark ____IronOxideClassicEffectKernel



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	IronOxideClassic::IronOxideClassicKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		IronOxideClassic::IronOxideClassicKernel::Reset()
{
	for (int temp = 0; temp < 263; temp++) {d[temp] = 0.0;}
	gcount = 0;
	fastIIRA = fastIIRB = slowIIRA = slowIIRB = 0.0;
	iirSampleA = iirSampleB = 0.0;
	fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX;
	fpFlip = true;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	IronOxideClassic::IronOxideClassicKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		IronOxideClassic::IronOxideClassicKernel::Process(	const Float32 	*inSourceP,
                                                    Float32		 	*inDestP,
                                                    UInt32 			inFramesToProcess,
                                                    UInt32			inNumChannels, 
                                                    bool			&ioSilence )
{
	UInt32 nSampleFrames = inFramesToProcess;
	const Float32 *sourceP = inSourceP;
	Float32 *destP = inDestP;
	
	Float64 inputgain = pow(10.0,GetParameter( kParam_One )/20.0);
	Float64 outputgain = pow(10.0,GetParameter( kParam_Three )/20.0);
	Float64 ips = GetParameter( kParam_Two ) * 1.1;
	//slight correction to dial in convincing ips settings
	if (ips < 1 || ips > 200){ips=33.0;}
	//sanity checks are always key
	Float64 iirAmount = ips/430.0; //for low leaning
	Float64 bridgerectifier;
	Float64 fastTaper = ips/15.0;
	Float64 slowTaper = 2.0/(ips*ips);
	Float64 lowspeedscale = (5.0/ips);
	double inputSample;
	SInt32 count;
	Float64 temp;
	Float64 overallscale = 1.0;
	overallscale /= 44100.0;
	overallscale *= GetSampleRate();
	if (overallscale == 0) {fastTaper += 1.0; slowTaper += 1.0;}
	else
	{
		iirAmount /= overallscale;
		lowspeedscale *= overallscale;
		fastTaper = 1.0 + (fastTaper / overallscale);
		slowTaper = 1.0 + (slowTaper / overallscale);
	}
	
	while (nSampleFrames-- > 0) {
		inputSample = *sourceP;
		if (fabs(inputSample)<1.18e-23) inputSample = fpd * 1.18e-17;
				
		if (fpFlip)
		{
			iirSampleA = (iirSampleA * (1 - iirAmount)) + (inputSample * iirAmount);
			inputSample -= iirSampleA;
		}
		else
		{
			iirSampleB = (iirSampleB * (1 - iirAmount)) + (inputSample * iirAmount);
			inputSample -= iirSampleB;
		}
		//do IIR highpass for leaning out
		
		if (inputgain != 1.0) inputSample *= inputgain;
		
		bridgerectifier = fabs(inputSample);
		if (bridgerectifier > 1.57079633) bridgerectifier = 1.57079633;
		bridgerectifier = sin(bridgerectifier);
		if (inputSample > 0.0) inputSample = bridgerectifier;
		else inputSample = -bridgerectifier;		
		
		if (gcount < 0 || gcount > 131) {gcount = 131;}
		count = gcount;
		//increment the counter
		
		d[count+131] = d[count] = inputSample;
		if (fpFlip)
		{
			fastIIRA = fastIIRA/fastTaper;
			slowIIRA = slowIIRA/slowTaper;
			//scale stuff down
			fastIIRA += d[count];
			count += 3;
			temp = d[count+127];
			temp += d[count+113];
			temp += d[count+109];
			temp += d[count+107];
			temp += d[count+103];
			temp += d[count+101];
			temp += d[count+97];
			temp += d[count+89];
			temp += d[count+83];
			temp /= 2;
			temp += d[count+79];
			temp += d[count+73];
			temp += d[count+71];
			temp += d[count+67];
			temp += d[count+61];
			temp += d[count+59];
			temp += d[count+53];
			temp += d[count+47];
			temp += d[count+43];
			temp += d[count+41];
			temp += d[count+37];
			temp += d[count+31];
			temp += d[count+29];
			temp /= 2;
			temp += d[count+23];
			temp += d[count+19];
			temp += d[count+17];
			temp += d[count+13];
			temp += d[count+11];
			temp /= 2;
			temp += d[count+7];
			temp += d[count+5];
			temp += d[count+3];
			temp /= 2;
			temp += d[count+2];
			temp += d[count+1];
			slowIIRA += (temp/128);
			inputSample = fastIIRA - (slowIIRA / slowTaper);
		}
		else
		{
			fastIIRB = fastIIRB/fastTaper;
			slowIIRB = slowIIRB/slowTaper;
			//scale stuff down
			fastIIRB += d[count];
			count += 3;
			temp = d[count+127];
			temp += d[count+113];
			temp += d[count+109];
			temp += d[count+107];
			temp += d[count+103];
			temp += d[count+101];
			temp += d[count+97];
			temp += d[count+89];
			temp += d[count+83];
			temp /= 2;
			temp += d[count+79];
			temp += d[count+73];
			temp += d[count+71];
			temp += d[count+67];
			temp += d[count+61];
			temp += d[count+59];
			temp += d[count+53];
			temp += d[count+47];
			temp += d[count+43];
			temp += d[count+41];
			temp += d[count+37];
			temp += d[count+31];
			temp += d[count+29];
			temp /= 2;
			temp += d[count+23];
			temp += d[count+19];
			temp += d[count+17];
			temp += d[count+13];
			temp += d[count+11];
			temp /= 2;
			temp += d[count+7];
			temp += d[count+5];
			temp += d[count+3];
			temp /= 2;
			temp += d[count+2];
			temp += d[count+1];
			slowIIRB += (temp/128);
			inputSample = fastIIRB - (slowIIRB / slowTaper);
		}
		inputSample /= fastTaper;
		inputSample /= lowspeedscale;
		
		bridgerectifier = fabs(inputSample);
		if (bridgerectifier > 1.57079633) bridgerectifier = 1.57079633;
		bridgerectifier = sin(bridgerectifier);
		//can use as an output limiter
		if (inputSample > 0.0) inputSample = bridgerectifier;
		else inputSample = -bridgerectifier;
		//second stage of overdrive to prevent overs and allow bloody loud extremeness
		
		if (outputgain != 1.0) inputSample *= outputgain;
		fpFlip = !fpFlip;
		
		//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;
	}
}

