LittleEngine/RandomNumberGenerator.h at master · dacunni/LittleEngine · GitHub

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#ifndef _RANDOM_NUMBER_GENERATOR_H_
#define _RANDOM_NUMBER_GENERATOR_H_

class Vector4;

class RandomNumberGenerator
{
public:
	RandomNumberGenerator();
	~RandomNumberGenerator() {}

	inline float uniform01(void);
	inline float uniformRange(float min, float max);

	void uniformSurfaceUnitSphere(float & x, float & y, float & z);
    void uniformSurfaceUnitSphere(Vector4 & v);
    void uniformSurfaceUnitHalfSphere(const Vector4 & half_space, Vector4 & v);

    void uniformVolumeUnitSphere(float & x, float & y, float & z);

	void seedCurrentTime();

private:
	inline float uniform01Impl(void);
    void buildCache();

    static const unsigned int CACHE_SIZE = 1000;

    unsigned int cache_next = CACHE_SIZE; // next available cache entry, or CACHE_SIZE if none left
    float cache[CACHE_SIZE];
};

#include "RandomNumberGenerator.hpp"

#endif