/*
*	File:		BitShiftPan.cpp
*	
*	Version:	1.0
* 
*	Created:	5/9/23
*	
*	Copyright:  Copyright © 2023 Airwindows, Airwindows uses the MIT license
* 
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/*=============================================================================
	BitShiftPan.cpp
	
=============================================================================*/
#include "BitShiftPan.h"


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

COMPONENT_ENTRY(BitShiftPan)


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	BitShiftPan::BitShiftPan
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
BitShiftPan::BitShiftPan(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
	
}


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



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	BitShiftPan::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			BitShiftPan::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;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	BitShiftPan::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			BitShiftPan::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 BitShiftPan::SupportedNumChannels(const AUChannelInfo ** outInfo)
{
	if (outInfo != NULL)
	{
		static AUChannelInfo info;
		info.inChannels = 2;
		info.outChannels = 2;
		*outInfo = &info;
	}

	return 1;
}

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

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

#pragma mark ____BitShiftPanEffectKernel



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	BitShiftPan::BitShiftPanKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult		BitShiftPan::Reset(AudioUnitScope inScope, AudioUnitElement inElement)
{
	return noErr;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	BitShiftPan::ProcessBufferLists
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
OSStatus		BitShiftPan::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 gainControl = (GetParameter( kParam_One )*0.5)+0.05; //0.0 to 1.0
	int gainBits = 20; //start beyond maximum attenuation
	if (gainControl > 0.0) gainBits = floor(1.0 / gainControl);
	int bitshiftL = gainBits - 3;
	int bitshiftR = gainBits - 3;
	double panControl = (GetParameter( kParam_Two )*2.0)-1.0; //-1.0 to 1.0
	double panAttenuation = (1.0-fabs(panControl));
	int panBits = 20; //start centered
	if (panAttenuation > 0.0) panBits = floor(1.0 / panAttenuation);
	if (panControl > 0.25) bitshiftL += panBits;
	if (panControl < -0.25) bitshiftR += panBits;
	if (bitshiftL < -2) bitshiftL = -2; if (bitshiftL > 17) bitshiftL = 17;
	if (bitshiftR < -2) bitshiftR = -2; if (bitshiftR > 17) bitshiftR = 17;
	double gainL = 1.0;
	double gainR = 1.0;
	switch (bitshiftL)
	{
		case 17: gainL = 0.0; break;
		case 16: gainL = 0.0000152587890625; break;
		case 15: gainL = 0.000030517578125; break;
		case 14: gainL = 0.00006103515625; break;
		case 13: gainL = 0.0001220703125; break;
		case 12: gainL = 0.000244140625; break;
		case 11: gainL = 0.00048828125; break;
		case 10: gainL = 0.0009765625; break;
		case 9: gainL = 0.001953125; break;
		case 8: gainL = 0.00390625; break;
		case 7: gainL = 0.0078125; break;
		case 6: gainL = 0.015625; break;
		case 5: gainL = 0.03125; break;
		case 4: gainL = 0.0625; break;
		case 3: gainL = 0.125; break;
		case 2: gainL = 0.25; break;
		case 1: gainL = 0.5; break;
		case 0: gainL = 1.0; break;
		case -1: gainL = 2.0; break;
		case -2: gainL = 4.0; break;
	}
	switch (bitshiftR)
	{
		case 17: gainR = 0.0; break;
		case 16: gainR = 0.0000152587890625; break;
		case 15: gainR = 0.000030517578125; break;
		case 14: gainR = 0.00006103515625; break;
		case 13: gainR = 0.0001220703125; break;
		case 12: gainR = 0.000244140625; break;
		case 11: gainR = 0.00048828125; break;
		case 10: gainR = 0.0009765625; break;
		case 9: gainR = 0.001953125; break;
		case 8: gainR = 0.00390625; break;
		case 7: gainR = 0.0078125; break;
		case 6: gainR = 0.015625; break;
		case 5: gainR = 0.03125; break;
		case 4: gainR = 0.0625; break;
		case 3: gainR = 0.125; break;
		case 2: gainR = 0.25; break;
		case 1: gainR = 0.5; break;
		case 0: gainR = 1.0; break;
		case -1: gainR = 2.0; break;
		case -2: gainR = 4.0; break;
	}
	
	while (nSampleFrames-- > 0) {
		*outputL = *inputL * gainL; //in this plugin, all the work is done 
		*outputR = *inputR * gainR; //before the buffer is processed
		inputL += 1;
		inputR += 1;
		outputL += 1;
		outputR += 1;
	}
	return noErr;
}

