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https://github.com/thestk/stk
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50 lines
1015 B
C++
50 lines
1015 B
C++
/***************************************************/
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/*! \class Noise
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\brief STK noise generator.
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Generic random number generation using the
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C rand() function. The quality of the rand()
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function varies from one OS to another.
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by Perry R. Cook and Gary P. Scavone, 1995 - 2007.
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*/
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/***************************************************/
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#include "Noise.h"
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#include <stdlib.h>
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#include <time.h>
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Noise :: Noise() : Generator()
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{
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// Seed the random number generator with system time.
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this->setSeed( 0 );
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lastOutput_ = (StkFloat) 0.0;
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}
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Noise :: Noise( unsigned int seed ) : Generator()
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{
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// Seed the random number generator
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this->setSeed( seed );
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lastOutput_ = (StkFloat) 0.0;
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}
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Noise :: ~Noise()
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{
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}
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void Noise :: setSeed( unsigned int seed )
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{
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if ( seed == 0 )
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srand( (unsigned int) time(NULL) );
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else
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srand( seed );
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}
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StkFloat Noise :: computeSample()
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{
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lastOutput_ = (StkFloat) (2.0 * rand() / (RAND_MAX + 1.0) );
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lastOutput_ -= 1.0;
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return lastOutput_;
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}
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