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Fix crash when changing wavetable too quickly #106

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Fix crash when changing wavetable too quickly #106

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18 changes: 11 additions & 7 deletions src/main/java/ddf/minim/ugens/Wavetable.java
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Original file line number Diff line number Diff line change
Expand Up @@ -128,22 +128,26 @@ public float get(int i)
*/
public float value(float at)
{
float whichSample = lengthForValue * at;
// create local waveform for thread safe
float[] wave = this.waveform;
if(wave.length==0) return 0;

float whichSample = wave.length * (((at%1)+1)%1);

// linearly interpolate between the two samples we want.
int lowSamp = (int)whichSample;
int hiSamp = lowSamp + 1;
int lowSamp = ((int)whichSample)%wave.length;
int hiSamp = (lowSamp + 1)%wave.length;
// lowSamp might be the last sample in the waveform
// we need to make sure we wrap.
if ( hiSamp >= waveform.length )
if ( hiSamp >= wave.length )
{
hiSamp -= waveform.length;
hiSamp -= wave.length;
}

float rem = whichSample - lowSamp;

return waveform[lowSamp] + rem
* ( waveform[hiSamp] - waveform[lowSamp] );
return wave[lowSamp] + rem
* ( wave[hiSamp] - wave[lowSamp] );

// This was here for testing.
// Causes non-interpolation, but adds max # of oscillators
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