/*
*	File:		Srsly3.cpp
*	
*	Version:	1.0
* 
*	Created:	5/7/24
*	
*	Copyright:  Copyright © 2024 Airwindows, Airwindows uses the MIT license
* 
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/*=============================================================================
	Srsly3.cpp
	
=============================================================================*/
#include "Srsly3.h"


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

COMPONENT_ENTRY(Srsly3)


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Srsly3::Srsly3
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Srsly3::Srsly3(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 );
	SetParameter(kParam_Six, kDefaultValue_ParamSix );
	
#if AU_DEBUG_DISPATCHER
	mDebugDispatcher = new AUDebugDispatcher (this);
#endif
	
}


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Srsly3::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			Srsly3::GetParameterValueStrings(AudioUnitScope		inScope,
                                                                AudioUnitParameterID	inParameterID,
                                                                CFArrayRef *		outStrings)
{
        
    return kAudioUnitErr_InvalidProperty;
}



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Srsly3::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			Srsly3::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;
			case kParam_Six:
                AUBase::FillInParameterName (outParameterInfo, kParameterSixName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamSix;
                break;
			default:
                result = kAudioUnitErr_InvalidParameter;
                break;
		}
	} else {
        result = kAudioUnitErr_InvalidParameter;
    }
    


	return result;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Srsly3::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			Srsly3::GetPropertyInfo (AudioUnitPropertyID	inID,
                                                        AudioUnitScope		inScope,
                                                        AudioUnitElement	inElement,
                                                        UInt32 &		outDataSize,
                                                        Boolean &		outWritable)
{
	return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// state that plugin supports only stereo-in/stereo-out processing
UInt32 Srsly3::SupportedNumChannels(const AUChannelInfo ** outInfo)
{
	if (outInfo != NULL)
	{
		static AUChannelInfo info;
		info.inChannels = 2;
		info.outChannels = 2;
		*outInfo = &info;
	}

	return 1;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Srsly3::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			Srsly3::GetProperty(	AudioUnitPropertyID inID,
                                                        AudioUnitScope 		inScope,
                                                        AudioUnitElement 	inElement,
                                                        void *			outData )
{
	return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}

//	Srsly3::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Srsly3::Initialize()
{
    ComponentResult result = AUEffectBase::Initialize();
    if (result == noErr)
        Reset(kAudioUnitScope_Global, 0);
    return result;
}

#pragma mark ____Srsly3EffectKernel



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Srsly3::Srsly3Kernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult		Srsly3::Reset(AudioUnitScope inScope, AudioUnitElement inElement)
{
	for (int x = 0; x < 9; x++) {
		biquadM2[x] = 0.0;
		biquadM7[x] = 0.0;
		biquadM10[x] = 0.0;
		biquadL3[x] = 0.0;
		biquadL7[x] = 0.0;
		biquadR3[x] = 0.0;
		biquadR7[x] = 0.0;
		biquadS3[x] = 0.0;
		biquadS5[x] = 0.0;
	}
	fpdL = 1.0; while (fpdL < 16386) fpdL = rand()*UINT32_MAX;
	fpdR = 1.0; while (fpdR < 16386) fpdR = rand()*UINT32_MAX;
	return noErr;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Srsly3::ProcessBufferLists
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
OSStatus		Srsly3::ProcessBufferLists(AudioUnitRenderActionFlags & ioActionFlags,
													const AudioBufferList & inBuffer,
                                                    AudioBufferList & outBuffer,
                                                    UInt32 			inFramesToProcess)
{
	Float32 * inputL = (Float32*)(inBuffer.mBuffers[0].mData);
	Float32 * inputR = (Float32*)(inBuffer.mBuffers[1].mData);
	Float32 * outputL = (Float32*)(outBuffer.mBuffers[0].mData);
	Float32 * outputR = (Float32*)(outBuffer.mBuffers[1].mData);
	UInt32 nSampleFrames = inFramesToProcess;
	
	double sampleRate = GetSampleRate();
	if (sampleRate < 22000.0) sampleRate = 22000.0; //keep biquads in range
	
	biquadM2[0] = 2000.0 / sampleRate; //up
	biquadM7[0] = 7000.0 / sampleRate; //down
	biquadM10[0] = 10000.0 / sampleRate; //down
	
	biquadL3[0] = 3000.0 / sampleRate; //up
	biquadL7[0] = 7000.0 / sampleRate; //way up
	biquadR3[0] = 3000.0 / sampleRate; //up
	biquadR7[0] = 7000.0 / sampleRate; //way up
	
	biquadS3[0] = 3000.0 / sampleRate; //up
	biquadS5[0] = 5000.0 / sampleRate; //way down
	
	double focusM = 15.0-(GetParameter( kParam_One )*10.0);
	double focusS = 20.0-(GetParameter( kParam_Two )*15.0);
	double Q = GetParameter( kParam_Four )+0.25; //add Q control: from half to double intensity
	
	double gainM = GetParameter( kParam_One )*2.0;
	double gainS = GetParameter( kParam_Two )*2.0;
	if (gainS > 1.0) {
		gainM /= gainS;
		gainS *= gainS;
	}
	if (gainM > 1.0) gainM = 1.0;
	
    biquadM2[1] = focusM*0.25*Q; //Q, mid 2K boost is much broader
    biquadM7[1] = focusM*Q; //Q
    biquadM10[1] = focusM*Q; //Q
    biquadS3[1] = focusM*Q; //Q
    biquadS5[1] = focusM*Q; //Q
	
    biquadL3[1] = focusS*Q; //Q
    biquadL7[1] = focusS*Q; //Q
    biquadR3[1] = focusS*Q; //Q
    biquadR7[1] = focusS*Q; //Q
	
	double K = tan(M_PI * biquadM2[0]);
	double norm = 1.0 / (1.0 + K / biquadM2[1] + K * K);
	biquadM2[2] = K / biquadM2[1] * norm;
	biquadM2[4] = -biquadM2[2];
	biquadM2[5] = 2.0 * (K * K - 1.0) * norm;
	biquadM2[6] = (1.0 - K / biquadM2[1] + K * K) * norm;
	
	K = tan(M_PI * biquadM7[0]);
	norm = 1.0 / (1.0 + K / biquadM7[1] + K * K);
	biquadM7[2] = K / biquadM7[1] * norm;
	biquadM7[4] = -biquadM7[2];
	biquadM7[5] = 2.0 * (K * K - 1.0) * norm;
	biquadM7[6] = (1.0 - K / biquadM7[1] + K * K) * norm;
	
	K = tan(M_PI * biquadM10[0]);
	norm = 1.0 / (1.0 + K / biquadM10[1] + K * K);
	biquadM10[2] = K / biquadM10[1] * norm;
	biquadM10[4] = -biquadM10[2];
	biquadM10[5] = 2.0 * (K * K - 1.0) * norm;
	biquadM10[6] = (1.0 - K / biquadM10[1] + K * K) * norm;
	
	K = tan(M_PI * biquadL3[0]);
	norm = 1.0 / (1.0 + K / biquadL3[1] + K * K);
	biquadL3[2] = K / biquadL3[1] * norm;
	biquadL3[4] = -biquadL3[2];
	biquadL3[5] = 2.0 * (K * K - 1.0) * norm;
	biquadL3[6] = (1.0 - K / biquadL3[1] + K * K) * norm;
	
	K = tan(M_PI * biquadL7[0]);
	norm = 1.0 / (1.0 + K / biquadL7[1] + K * K);
	biquadL7[2] = K / biquadL7[1] * norm;
	biquadL7[4] = -biquadL7[2];
	biquadL7[5] = 2.0 * (K * K - 1.0) * norm;
	biquadL7[6] = (1.0 - K / biquadL7[1] + K * K) * norm;
	
	K = tan(M_PI * biquadR3[0]);
	norm = 1.0 / (1.0 + K / biquadR3[1] + K * K);
	biquadR3[2] = K / biquadR3[1] * norm;
	biquadR3[4] = -biquadR3[2];
	biquadR3[5] = 2.0 * (K * K - 1.0) * norm;
	biquadR3[6] = (1.0 - K / biquadR3[1] + K * K) * norm;
	
	K = tan(M_PI * biquadR7[0]);
	norm = 1.0 / (1.0 + K / biquadR7[1] + K * K);
	biquadR7[2] = K / biquadR7[1] * norm;
	biquadR7[4] = -biquadR7[2];
	biquadR7[5] = 2.0 * (K * K - 1.0) * norm;
	biquadR7[6] = (1.0 - K / biquadR7[1] + K * K) * norm;
	
	K = tan(M_PI * biquadS3[0]);
	norm = 1.0 / (1.0 + K / biquadS3[1] + K * K);
	biquadS3[2] = K / biquadS3[1] * norm;
	biquadS3[4] = -biquadS3[2];
	biquadS3[5] = 2.0 * (K * K - 1.0) * norm;
	biquadS3[6] = (1.0 - K / biquadS3[1] + K * K) * norm;
	
	K = tan(M_PI * biquadS5[0]);
	norm = 1.0 / (1.0 + K / biquadS5[1] + K * K);
	biquadS5[2] = K / biquadS5[1] * norm;
	biquadS5[4] = -biquadS5[2];
	biquadS5[5] = 2.0 * (K * K - 1.0) * norm;
	biquadS5[6] = (1.0 - K / biquadS5[1] + K * K) * norm;
	
	double depthM = pow(GetParameter( kParam_One ),2)*2.0; //proportion to mix in the filtered stuff
	double depthS = pow(GetParameter( kParam_Two ),2)*2.0; //proportion to mix in the filtered stuff
	double level = GetParameter( kParam_Three ); //output pad
	double nonLin = pow(GetParameter( kParam_Five ),2); //nonlinearity of filters
	double wet = GetParameter( kParam_Six ); //dry/wet
	
	//biquad contains these values:
	//[0] is frequency: 0.000001 to 0.499999 is near-zero to near-Nyquist
	//[1] is resonance, 0.7071 is Butterworth. Also can't be zero
	//[2] is a0 but you need distinct ones for additional biquad instances so it's here
	//[3] is a1 but you need distinct ones for additional biquad instances so it's here
	//[4] is a2 but you need distinct ones for additional biquad instances so it's here
	//[5] is b1 but you need distinct ones for additional biquad instances so it's here
	//[6] is b2 but you need distinct ones for additional biquad instances so it's here
	//[7] is LEFT stored delayed sample (freq and res are stored so you can move them sample by sample)
	//[8] is LEFT stored delayed sample (you have to include the coefficient making code if you do that)
	
	while (nSampleFrames-- > 0) {
		double inputSampleL = *inputL;
		double inputSampleR = *inputR;
		if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpdL * 1.18e-17;
		if (fabs(inputSampleR)<1.18e-23) inputSampleR = fpdR * 1.18e-17;
		double drySampleL = inputSampleL;
		double drySampleR = inputSampleR;
		
		double mid = inputSampleL + inputSampleR;
		double rawmid = mid * 0.5; //we'll use this to isolate L&R a little
		double side = inputSampleL - inputSampleR;
		double boostside = side * depthS;
		//assign mid and side.Between these sections, you can do mid/side processing
		
		double dia0 = fabs(biquadM2[2]*(1.0+(mid*nonLin))); if (dia0 > 1.0) dia0 = 1.0;
		double tempSample = (mid * dia0) + biquadM2[7];
		biquadM2[7] = (-tempSample * biquadM2[5]) + biquadM2[8];
		biquadM2[8] = (mid * -dia0) - (tempSample * biquadM2[6]);
		double M2Sample = tempSample; //like mono AU, 7 and 8 store L channel
		
		dia0 = fabs(biquadM7[2]*(1.0+(mid*nonLin))); if (dia0 > 1.0) dia0 = 1.0;
		tempSample = (mid * dia0) + biquadM7[7];
		biquadM7[7] = (-tempSample * biquadM7[5]) + biquadM7[8];
		biquadM7[8] = (mid * -dia0) - (tempSample * biquadM7[6]);
		double M7Sample = -tempSample*2.0; //like mono AU, 7 and 8 store L channel
		
		dia0 = fabs(biquadM10[2]*(1.0+(mid*nonLin))); if (dia0 > 1.0) dia0 = 1.0;
		tempSample = (mid * dia0) + biquadM10[7];
		biquadM10[7] = (-tempSample * biquadM10[5]) + biquadM10[8];
		biquadM10[8] = (mid * -dia0) - (tempSample * biquadM10[6]);
		double M10Sample = -tempSample*2.0; //like mono AU, 7 and 8 store L channel
		//mid
		
		dia0 = fabs(biquadS3[2]*(1.0+(side*nonLin))); if (dia0 > 1.0) dia0 = 1.0;
		tempSample = (side * dia0) + biquadS3[7];
		biquadS3[7] = (-tempSample * biquadS3[5]) + biquadS3[8];
		biquadS3[8] = (side * -dia0) - (tempSample * biquadS3[6]);
		double S3Sample = tempSample*2.0; //like mono AU, 7 and 8 store L channel
		
		dia0 = fabs(biquadS5[2]*(1.0+(side*nonLin))); if (dia0 > 1.0) dia0 = 1.0;
		tempSample = (side * dia0) + biquadS5[7];
		biquadS5[7] = (-tempSample * biquadS5[5]) + biquadS5[8];
		biquadS5[8] = (side * -dia0) - (tempSample * biquadS5[6]);
		double S5Sample = -tempSample*5.0; //like mono AU, 7 and 8 store L channel
		
		mid = (M2Sample + M7Sample + M10Sample)*depthM;
		side = (S3Sample + S5Sample + boostside)*depthS;
		
		double msOutSampleL = (mid+side)/2.0;
		double msOutSampleR = (mid-side)/2.0;
		//unassign mid and side
		
		double isoSampleL = inputSampleL-rawmid;
		double isoSampleR = inputSampleR-rawmid; //trying to isolate L and R a little
		
		dia0 = fabs(biquadL3[2]*(1.0+(isoSampleL*nonLin))); if (dia0 > 1.0) dia0 = 1.0;
		tempSample = (isoSampleL * dia0) + biquadL3[7];
		biquadL3[7] = (-tempSample * biquadL3[5]) + biquadL3[8];
		biquadL3[8] = (isoSampleL * -dia0) - (tempSample * biquadL3[6]);
		double L3Sample = tempSample; //like mono AU, 7 and 8 store L channel
		
		dia0 = fabs(biquadR3[2]*(1.0+(isoSampleR*nonLin))); if (dia0 > 1.0) dia0 = 1.0;
		tempSample = (isoSampleR * dia0) + biquadR3[7];
		biquadR3[7] = (-tempSample * biquadR3[5]) + biquadR3[8];
		biquadR3[8] = (isoSampleR * -dia0) - (tempSample * biquadR3[6]);
		double R3Sample = tempSample; //note: 9 and 10 store the R channel
		
		dia0 = fabs(biquadL7[2]*(1.0+(isoSampleL*nonLin))); if (dia0 > 1.0) dia0 = 1.0;
		tempSample = (isoSampleL * dia0) + biquadL7[7];
		biquadL7[7] = (-tempSample * biquadL7[5]) + biquadL7[8];
		biquadL7[8] = (isoSampleL * -dia0) - (tempSample * biquadL7[6]);
		double L7Sample = tempSample*3.0; //like mono AU, 7 and 8 store L channel
		
		dia0 = fabs(biquadR7[2]*(1.0+(isoSampleR*nonLin))); if (dia0 > 1.0) dia0 = 1.0;
		tempSample = (isoSampleR * dia0) + biquadR7[7];
		biquadR7[7] = (-tempSample * biquadR7[5]) + biquadR7[8];
		biquadR7[8] = (isoSampleR * -dia0) - (tempSample * biquadR7[6]);
		double R7Sample = tempSample*3.0; //note: 9 and 10 store the R channel
		
		double processingL = msOutSampleL + ((L3Sample + L7Sample)*depthS);
		double processingR = msOutSampleR + ((R3Sample + R7Sample)*depthS);
		//done with making filters, now we apply them
		
		mid = inputSampleL + inputSampleR;
		side = inputSampleL - inputSampleR;
		//re-assign mid and side.Between these sections, you can do mid/side processing
		
		mid *= gainM;
		side *= gainS;
		
		inputSampleL = ((mid+side)/2.0)+processingL;
		inputSampleR = ((mid-side)/2.0)+processingR;
		//unassign mid and side
		
		if (level < 1.0) {
			inputSampleL *= level;
			inputSampleR *= level;
		}		
				
		if (wet != 1.0) {
			inputSampleL = (inputSampleL * wet) + (drySampleL * (1.0-wet));
			inputSampleR = (inputSampleR * wet) + (drySampleR * (1.0-wet));
		}
		//Dry/Wet control, defaults to the last slider
		
		//begin 32 bit stereo floating point dither
		int expon; frexpf((float)inputSampleL, &expon);
		fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
		inputSampleL += ((double(fpdL)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
		frexpf((float)inputSampleR, &expon);
		fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
		inputSampleR += ((double(fpdR)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
		//end 32 bit stereo floating point dither
		
		*outputL = inputSampleL;
		*outputR = inputSampleR;
		//direct stereo out
		
		inputL += 1;
		inputR += 1;
		outputL += 1;
		outputR += 1;
	}
	return noErr;
}

