/*

     File: SinSynth.cpp

 Abstract: SinSynth.h

  Version: 1.2

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*/

#include "SinSynth.h"

static const UInt32 kMaxActiveNotes = 8;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

const double twopi = 2.0 * 3.14159265358979;

inline double pow5(double x) { double x2 = x*x; return x2*x2*x; }

#pragma mark SinSynth Methods

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

AUDIOCOMPONENT_ENTRY(AUMusicDeviceFactory, SinSynth)

static const AudioUnitParameterID kGlobalVolumeParam = 0;

static const CFStringRef kGlobalVolumeName = CFSTR("global volume");

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

//  SinSynth::SinSynth

//

// This synth has No inputs, One output

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

SinSynth::SinSynth(ComponentInstance inComponentInstance)

    : AUMonotimbralInstrumentBase(inComponentInstance, 0, 1)

{

    CreateElements();

    Globals()->UseIndexedParameters(1); // we're only defining one param

    Globals()->SetParameter (kGlobalVolumeParam, 1.0);

}

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

//  SinSynth::~SinSynth

//

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

SinSynth::~SinSynth()

{

}

void SinSynth::Cleanup()

{

#if DEBUG_PRINT

    printf("SinSynth::Cleanup\n");

#endif

}

OSStatus SinSynth::Initialize()

{   

#if DEBUG_PRINT

    printf("->SinSynth::Initialize\n");

#endif

    AUMonotimbralInstrumentBase::Initialize();

    SetNotes(kNumNotes, kMaxActiveNotes, mTestNotes, sizeof(TestNote));

#if DEBUG_PRINT

    printf("<-SinSynth::Initialize\n");

#endif

    return noErr;

}

AUElement* SinSynth::CreateElement( AudioUnitScope                  scope,

                                    AudioUnitElement                element)

{

    switch (scope)

    {

        case kAudioUnitScope_Group :

            return new SynthGroupElement(this, element, new MidiControls);

        case kAudioUnitScope_Part :

            return new SynthPartElement(this, element);

        default :

            return AUBase::CreateElement(scope, element);

    }

}

OSStatus            SinSynth::GetParameterInfo(     AudioUnitScope                  inScope,

                                                        AudioUnitParameterID            inParameterID,

                                                        AudioUnitParameterInfo &        outParameterInfo)

{

    if (inParameterID != kGlobalVolumeParam) return kAudioUnitErr_InvalidParameter;

    if (inScope != kAudioUnitScope_Global) return kAudioUnitErr_InvalidScope;

    outParameterInfo.flags = SetAudioUnitParameterDisplayType (0, kAudioUnitParameterFlag_DisplaySquareRoot);

    outParameterInfo.flags += kAudioUnitParameterFlag_IsWritable;

    outParameterInfo.flags += kAudioUnitParameterFlag_IsReadable;

    AUBase::FillInParameterName (outParameterInfo, kGlobalVolumeName, false);

    outParameterInfo.unit = kAudioUnitParameterUnit_LinearGain;

    outParameterInfo.minValue = 0;

    outParameterInfo.maxValue = 1.0;

    outParameterInfo.defaultValue = 1.0;

    return noErr;

}

#pragma mark TestNote Methods

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

void            TestNote::Release(UInt32 inFrame)

{

    SynthNote::Release(inFrame);

#if DEBUG_PRINT

    printf("TestNote::Release %p %d\n", this, GetState());

#endif

}

void            TestNote::FastRelease(UInt32 inFrame) // voice is being stolen.

{

    SynthNote::Release(inFrame);

#if DEBUG_PRINT

    printf("TestNote::Release %p %d\n", this, GetState());

#endif

}

void            TestNote::Kill(UInt32 inFrame) // voice is being stolen.

{

    SynthNote::Kill(inFrame);

#if DEBUG_PRINT

    printf("TestNote::Kill %p %d\n", this, GetState());

#endif

}

OSStatus        TestNote::Render(UInt64 inAbsoluteSampleFrame, UInt32 inNumFrames, AudioBufferList** inBufferList, UInt32 inOutBusCount)

{

    float *left, *right;

/* ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~  

    Changes to this parameter (kGlobalVolumeParam) are not being de-zippered; 

    Left as an exercise for the reader

 ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ */

    float globalVol = GetGlobalParameter(kGlobalVolumeParam);

    // TestNote only writes into the first bus regardless of what is handed to us.

    const int bus0 = 0;

    int numChans = inBufferList[bus0]->mNumberBuffers;

    if (numChans > 2) return -1;

    left = (float*)inBufferList[bus0]->mBuffers[0].mData;

    right = numChans == 2 ? (float*)inBufferList[bus0]->mBuffers[1].mData : 0;

    double sampleRate = SampleRate();

    double freq = Frequency() * (twopi/sampleRate);

#if DEBUG_PRINT_RENDER

    printf("TestNote::Render %p %d %g %g\n", this, GetState(), phase, amp);

#endif

    switch (GetState())

    {

        case kNoteState_Attacked :

        case kNoteState_Sostenutoed :

        case kNoteState_ReleasedButSostenutoed :

        case kNoteState_ReleasedButSustained :

            {

                for (UInt32 frame=0; frame<inNumFrames; ++frame)

                {

                    if (amp < maxamp) amp += up_slope;

                    float out = pow5(sin(phase)) * amp * globalVol;

                    phase += freq;

                    if (phase > twopi) phase -= twopi;

                    left[frame] += out;

                    if (right) right[frame] += out;

                }

            }

            break;

        case kNoteState_Released :

            {

                UInt32 endFrame = 0xFFFFFFFF;

                for (UInt32 frame=0; frame<inNumFrames; ++frame)

                {

                    if (amp > 0.0) amp += dn_slope;

                    else if (endFrame == 0xFFFFFFFF) endFrame = frame;

                    float out = pow5(sin(phase)) * amp * globalVol;

                    phase += freq;

                    left[frame] += out;

                    if (right) right[frame] += out;

                }

                if (endFrame != 0xFFFFFFFF) {

#if DEBUG_PRINT

                    printf("TestNote::NoteEnded  %p %d %g %g\n", this, GetState(), phase, amp);

#endif

                    NoteEnded(endFrame);

                }

            }

            break;

        case kNoteState_FastReleased :

            {

                UInt32 endFrame = 0xFFFFFFFF;

                for (UInt32 frame=0; frame<inNumFrames; ++frame)

                {

                    if (amp > 0.0) amp += fast_dn_slope;

                    else if (endFrame == 0xFFFFFFFF) endFrame = frame;

                    float out = pow5(sin(phase)) * amp * globalVol;

                    phase += freq;

                    left[frame] += out;

                    if (right) right[frame] += out;

                }

                if (endFrame != 0xFFFFFFFF) {

#if DEBUG_PRINT

                    printf("TestNote::NoteEnded  %p %d %g %g\n", this, GetState(), phase, amp);

#endif

                    NoteEnded(endFrame);

                }

            }

            break;

        default :

            break;

    }

    return noErr;

}