Freelog Special Edition 10/FreelogHS10.iso/Buzz/Buzz_Advanced_Pack.exe/{app}/Dev/Distortion/Distortion.cpp

C/C++ Source or Header | 2001-08-27 | 5KB | 263 lines

#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <math.h>
#include "../../MachineInterface.h"

CMachineParameter const paraThreshold =
{
    pt_word,                                        // type
    "+threshold",
    "Positive threshold level",                        // description
    0,                                                // MinValue
    0xfffe,                                            // MaxValue
    0xffff,                                            // NoValue
    MPF_STATE,                                        // Flags
    0x200,
};

CMachineParameter const paraClamp =
{
    pt_word,                                        // type
    "+clamp",
    "Positive clamp level",                            // description
    0,                                                // MinValue
    0xfffe,                                            // MaxValue
    0xffff,                                            // NoValue
    MPF_STATE,                                        // Flags
    0x1000
};

CMachineParameter const paraNegThreshold =
{
    pt_word,                                        // type
    "-threshold",
    "Negative threshold level",                        // description
    0,                                                // MinValue
    0xfffe,                                            // MaxValue
    0xffff,                                            // NoValue
    MPF_STATE,                                        // Flags
    0x200
};

CMachineParameter const paraNegClamp =
{
    pt_word,                                        // type
    "-clamp",
    "Negative clamp level",                            // description
    0,                                                // MinValue
    0xfffe,                                            // MaxValue
    0xffff,                                            // NoValue
    MPF_STATE,                                        // Flags
    0x1000
};

CMachineParameter const paraAmount =
{
    pt_byte,                                        // type
    "Amount",
    "Amount",                                        // description
    0,                                                // MinValue
    0x7f,                                              // MaxValue
    0xff,                                           // NoValue
    MPF_STATE,                                        // Flags
    0x7f
};

CMachineParameter const *pParameters[] =
{
    // global
    ¶Threshold,
    ¶Clamp,
    ¶NegThreshold,
    ¶NegClamp,
    ¶Amount

};

CMachineAttribute const attrSymmetric =
{
    "Symmetric",
    0,
    1,
    0
};

CMachineAttribute const *pAttributes[] =
{
    &attrSymmetric
};


#pragma pack(1)

class gvals
{
public:
    word threshold;
    word clamp;
    word negthreshold;
    word negclamp;
    byte amount;
};

class avals
{
public:
    int symmetric;
};

#pragma pack()

CMachineInfo const MacInfo =
{
    MT_EFFECT,                                // type
    MI_VERSION,
    0,                                        // flags
    0,                                        // min tracks
    0,                                        // max tracks
    5,                                        // numGlobalParameters
    0,                                        // numTrackParameters
    pParameters,
    1,
    pAttributes,
#ifdef _DEBUG
    "Jeskola Distortion (Debug build)",        // name
#else
    "Jeskola Distortion",                    // name
#endif
    "Dist",                                    // short name
    "Oskari Tammelin",                        // author
    NULL
};


class mi : public CMachineInterface
{
public:
    mi();
    virtual ~mi();

    virtual void Init(CMachineDataInput * const pi);
    virtual void Tick();
    virtual bool Work(float *psamples, int numsamples, int const mode);

private:



private:
    float Threshold;
    float Clamp;
    float NegThreshold;
    float NegClamp;
    float Amount;

    gvals gval;
    avals aval;

};

DLL_EXPORTS

mi::mi()
{
    GlobalVals = &gval;
    AttrVals = (int *)&aval;
}

mi::~mi()
{
}

void mi::Init(CMachineDataInput * const pi)
{
    Threshold = 65536 * 16.0;
    Clamp = 65536 * 16.0;
    NegThreshold = -65536 * 16.0;
    NegClamp = -65536 * 16.0;
    Amount = 1.0;
}

void mi::Tick()
{
    if (gval.threshold != paraThreshold.NoValue)
        Threshold = (float)(gval.threshold * 16.0);

    if (gval.clamp != paraClamp.NoValue)
        Clamp = (float)(gval.clamp * 16.0);

    if (gval.negthreshold != paraNegThreshold.NoValue)
        NegThreshold = (float)(gval.negthreshold * -16.0);

    if (gval.negclamp != paraNegClamp.NoValue)
        NegClamp = (float)(gval.negclamp * -16.0);

    if (gval.amount != paraAmount.NoValue)
        Amount = (float)(gval.amount * (1.0 / 0x7f));
}


bool mi::Work(float *psamples, int numsamples, int const mode)
{
    if (mode == WM_WRITE || mode == WM_NOIO)
        return false;

    if (mode == WM_READ || Amount == 0)
        return true;

    double const drymix = 1.0 - Amount;
    float const clamp = (float)(Amount * Clamp);
    double const threshold = Threshold;
    float negclamp;
    double negthreshold;

    if (aval.symmetric)
    {
        negthreshold = -threshold;
        negclamp = -clamp;
    }
    else
    {
        negthreshold = NegThreshold;
        negclamp = (float)(Amount * NegClamp);
    }


    if (drymix < 0.001)
    {
        do
        {
            double const s = *psamples;

            if (s >= threshold)
                *psamples = clamp;
            else if (s <= negthreshold)
                *psamples = negclamp;

            psamples++;

        } while(--numsamples);
    }
    else
    {
        do
        {
            double const s = *psamples;

            if (s >= threshold)
                *psamples = (float)(s * drymix + clamp);
            else if (s <= negthreshold)
                *psamples = (float)(s * drymix + negclamp);

            psamples++;

        } while(--numsamples);
    }

    return true;
}