/*
 *	File:		Hull.cpp
 *	
 *	Version:	1.0
 * 
 *	Created:	7/19/21
 *	
 *	Copyright:  Copyright © 2021 Airwindows, Airwindows uses the MIT license
 * 
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/*=============================================================================
 Hull.cpp
 
 =============================================================================*/
#include "Hull.h"


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

COMPONENT_ENTRY(Hull)


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Hull::Hull
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Hull::Hull(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
	
}


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



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Hull::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			Hull::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 = -1.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamTwo;
                break;
			default:
                result = kAudioUnitErr_InvalidParameter;
                break;
		}
	} else {
        result = kAudioUnitErr_InvalidParameter;
    }
    
	
	
	return result;
}

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

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

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

#pragma mark ____HullEffectKernel



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Hull::HullKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		Hull::HullKernel::Reset()
{
	for(int count = 0; count < 4002; count++) b[count] = 0.0;
	for(int count = 0; count < 102; count++) c[count] = 0.0;
	bPointer = 1; cPointer = 1;
	
	fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Hull::HullKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		Hull::HullKernel::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 /= 96000.0;
	overallscale *= GetSampleRate(); //this one's scaled to 96k for the deepest bass
	if (overallscale > 1.0) overallscale = 1.0; //and if you go for 192k, rather than crash
	//it just cuts out the maximum (2000) depth of averaging you can get
	Float64 hullSetting = pow(GetParameter( kParam_One ),3)*overallscale;
	int limitA = (hullSetting*2000.0)+1.0;
	double divisorA = 1.0/limitA;
	int limitB = (hullSetting*1000.0)+1.0;
	double divisorB = 1.0/limitB;
	int limitC = sqrt(hullSetting*2000.0)+1.0;
	double divisorC = 1.0/limitC;
	Float64 wet = -GetParameter( kParam_Two ); //functions as dark/bright
		
	while (nSampleFrames-- > 0) {
		double inputSample = *sourceP;
		if (fabs(inputSample)<1.18e-23) inputSample = fpd * 1.18e-17;
		double drySample = inputSample;
		
		bPointer--; if (bPointer < 0) bPointer += 2000;
		b[bPointer] = b[bPointer+2000] = inputSample;

		int x = bPointer;
		double longAverage = 0.0;
		double shortAverage = 0.0;
		while (x < bPointer+limitB) {
			shortAverage += b[x];
			longAverage += b[x];
			x++;
		} //once shorter average is reached, continue to longer
		while (x < bPointer+limitA) {
			longAverage += b[x];
			x++;
		}
		longAverage *= divisorA;
		shortAverage *= divisorB;
		
		
		cPointer--; if (cPointer < 0) cPointer += 50;
		c[cPointer] = c[cPointer+50] = shortAverage+(shortAverage-longAverage);
		
		x = cPointer;
		double shortestAverage = 0.0;
		while (x < cPointer+limitC) {
			shortestAverage += c[x];
			x++;
		}
		shortestAverage *= divisorC;
				
		if (wet > 0.0) {
			inputSample = (shortestAverage * wet)+(drySample * (1.0-wet)); //dark
		} else {
			inputSample = ((inputSample-shortestAverage) * fabs(wet))+(drySample * (1.0+wet)); //bright
		}		
		
		//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;
	}
}

