/ray/src/lib/numerics/rng/rng.h

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/*
 * lib/numerics/rng/rng.h
 * 
 * RNG base class definition. 
 * 
 * Copyright (c) 2004 by Wolfgang Wieser ] wwieser (a) gmx <*> de [ 
 * 
 * This file may be distributed and/or modified under the terms of the 
 * GNU General Public License version 2 as published by the Free Software 
 * Foundation. (See COPYING.GPL for details.)
 * 
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 * 
 */

#ifndef _LIB_NUMERICS_RNG_RandomNumberGenerator_H_
#define _LIB_NUMERICS_RNG_RandomNumberGenerator_H_ 1

#include <lib/numerics/num_math.h>

namespace NUM  // numerics
{

class RandomNumberGenerator_Base
{
    public:
        // Some useful constants for scaling to the 0..1 range: 
        // --> See FPConst<dbl> in num_math.h. 
        
        RandomNumberGenerator_Base(const RandomNumberGenerator_Base &);
        void operator=(const RandomNumberGenerator_Base &);
    public:
        RandomNumberGenerator_Base() {}
        virtual ~RandomNumberGenerator_Base() {}
        
        virtual void seed(uint32 seed);
        
        virtual uint32 rand_uint32();
        virtual int32 rand_int32()
            {  return((int32)(rand_uint32()>>1));  }
        
        virtual dbl rand_dbl32o()
            {  return(rand_uint32()*FPConst<dbl>::div_1_pow_2_32);  }
        virtual dbl rand_dbl32()
            {  return(rand_uint32()*FPConst<dbl>::div_1_pow_2_32m1);  }
        
        virtual dbl rand_dbl53o()
        {
            uint32 a=rand_uint32()>>5, b=rand_uint32()>>6; 
            return( (a*67108864.0+b)*FPConst<dbl>::div_1_pow_2_53 );
        }
        virtual dbl rand_dbl53()
        {
            uint32 a=rand_uint32()>>5, b=rand_uint32()>>6; 
            return( (a*67108864.0+b)*FPConst<dbl>::div_1_pow_2_53m1 );
        }
};


class RandomNumberGenerator
{
    private:
    public:
};

}  // end of namespace NUM

#endif  /* _LIB_NUMERICS_RNG_RandomNumberGenerator_H_ */

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