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// -*-C++-*-
// This file is part of the gmod package
// Copyright (C) 1997 by Andrew J. Robinson
#include <sys/types.h>
#include "defines.h"
#include "Envelope.h"
void
Envelope::load(int numPoints, int sustainPoint, int loopStartPoint,
int loopEndPoint, int typeFlags, unsigned short fadeout,
int baseVal, unsigned char *data)
{
int i, prevX, prevY;
unsigned char *dataPtr = data;
fadeRate = fadeout;
baseValue_ = baseVal;
if (!(typeFlags & 0x01))
{
numSegments = 0;
return;
}
sustainOn = typeFlags & 0x02;
loopOn = typeFlags & 0x04;
numSegments = numPoints - 1;
if (envelope != 0)
delete [] envelope;
envelope = new EnvelopeSegment[numSegments];
if (sustainOn)
sustainX = INTEL_SHORT(dataPtr + (sustainPoint * 4));
if (loopOn)
{
loopStartX = INTEL_SHORT(dataPtr + (loopStartPoint * 4));
loopEndX = INTEL_SHORT(dataPtr + (loopEndPoint * 4));
}
prevX = INTEL_SHORT(dataPtr);
dataPtr += 2;
prevY = INTEL_SHORT(dataPtr);
dataPtr += 2;
for (i = 0; i < numSegments; i++)
{
envelope[i].startX = prevX;
envelope[i].startY = prevY;
prevX = envelope[i].endX = INTEL_SHORT(dataPtr);
dataPtr += 2;
prevY = envelope[i].endY = INTEL_SHORT(dataPtr);
dataPtr += 2;
envelope[i].m = double(envelope[i].endY - envelope[i].startY) /
double(envelope[i].endX - envelope[i].startX);
envelope[i].b = double(envelope[i].startY) -
double(envelope[i].m * envelope[i].startX);
}
}
int
Envelope::getY(int &x, char inSustain, unsigned short *fade) const
{
int y;
if (numSegments == 0)
y = baseValue_;
else
{
if ((sustainOn) && (inSustain == MY_TRUE) && (x > sustainX))
x = sustainX;
if ((loopOn) && (x >= loopEndX))
x = loopStartX;
if (x > envelope[numSegments - 1].endX)
x = envelope[numSegments - 1].endX;
for (int i = 0; i < numSegments; i++)
{
if ((envelope[i].startX <= x) && (envelope[i].endX >= x))
y = envelope[i].m * x + envelope[i].b;
}
x++;
}
if ((inSustain == MY_FALSE) && fade)
{
y = (y * (*fade)) / 65535;
if (fadeRate <= *fade)
*fade -= fadeRate;
else
*fade = 0;
}
return (y);
}
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