xorshift32.h

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#ifndef __XORSHIFT32__
#define __XORSHIFT32__
 
namespace spritestudio6
{
 
#ifdef WIN32
 
    #ifndef uint32_t    
        typedef unsigned int _uint32_t;
    #endif
#else
    typedef  uint32_t   _uint32_t;
#endif
 
class xorshift32
{
protected:
 
 
    _uint32_t  y;
 
 
public:
    xorshift32(){}
    ~xorshift32(){}
 
    void    init_genrand(unsigned long seed) {y=seed;}
 
    _uint32_t genrand_uint32(){
        y = y ^ ( y << 13 );
        y = y ^ ( y >> 17 );
        y = y ^ ( y << 15 );
 
        return y;
    }
 
    float genrand_float32() {
        _uint32_t v = genrand_uint32();
        _uint32_t res = (v >> 9) | 0x3f800000;
        float   r = (*(float*)&res) - 1.0f;
 
        return r;
    }
 
} ;
 
 
}   // namespace spritestudio6
 
 
#endif