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@@ -72,99 +72,99 @@ static inline void RestoreRandomSeeds(co
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void SetRandomSeed(uint32 seed);
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#ifdef RANDOM_DEBUG
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#ifdef __APPLE__
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#define OTTD_Random() DoRandom(__LINE__, __FILE__)
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#else
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#define Random() DoRandom(__LINE__, __FILE__)
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#endif
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uint32 DoRandom(int line, const char *file);
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#define RandomRange(max) DoRandomRange(max, __LINE__, __FILE__)
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uint32 DoRandomRange(uint32 max, int line, const char *file);
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#else
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static FORCEINLINE uint32 Random()
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static inline uint32 Random()
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{
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return _random.Next();
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}
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static FORCEINLINE uint32 RandomRange(uint32 max)
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static inline uint32 RandomRange(uint32 max)
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{
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return _random.Next(max);
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}
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#endif
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static FORCEINLINE uint32 InteractiveRandom()
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static inline uint32 InteractiveRandom()
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{
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return _interactive_random.Next();
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}
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static FORCEINLINE uint32 InteractiveRandomRange(uint32 max)
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static inline uint32 InteractiveRandomRange(uint32 max)
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{
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return _interactive_random.Next(max);
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}
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/**
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* Checks if a given randomize-number is below a given probability.
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*
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* This function is used to check if the given probability by the fraction of (a/b)
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* is greater than low 16 bits of the given randomize-number r.
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*
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* Do not use this function twice on the same random 16 bits as it will yield
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* the same result. One can use a random number for two calls to Chance16I,
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* where one call sends the low 16 bits and the other the high 16 bits.
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*
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* @param a The numerator of the fraction
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* @param b The denominator of the fraction, must of course not be null
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* @param r The given randomize-number
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* @return True if the probability given by r is less or equal to (a/b)
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*/
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static FORCEINLINE bool Chance16I(const uint a, const uint b, const uint32 r)
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static inline bool Chance16I(const uint a, const uint b, const uint32 r)
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{
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assert(b != 0);
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return (((uint16)r * b + b / 2) >> 16) < a;
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}
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/**
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* Flips a coin with given probability.
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*
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* This function returns true with (a/b) probability.
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*
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* @see Chance16I()
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* @param a The nominator of the fraction
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* @param b The denominator of the fraction
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* @return True with (a/b) probability
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*/
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#ifdef RANDOM_DEBUG
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#define Chance16(a, b) Chance16I(a, b, DoRandom(__LINE__, __FILE__))
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#else
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static FORCEINLINE bool Chance16(const uint a, const uint b)
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static inline bool Chance16(const uint a, const uint b)
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{
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return Chance16I(a, b, Random());
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}
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#endif /* RANDOM_DEBUG */
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/**
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* Flips a coin with a given probability and saves the randomize-number in a variable.
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*
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* This function uses the same parameters as Chance16. The third parameter
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* must be a variable the randomize-number from Random() is saved in.
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*
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* The low 16 bits of r will already be used and can therefor not be passed to
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* Chance16I. One can only send the high 16 bits to Chance16I.
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*
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* @see Chance16I()
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* @param a The numerator of the fraction
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* @param b The denominator of the fraction
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* @param r The variable to save the randomize-number from Random()
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* @return True in (a/b) percent
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*/
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#ifdef RANDOM_DEBUG
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#define Chance16R(a, b, r) (r = DoRandom(__LINE__, __FILE__), Chance16I(a, b, r))
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#else
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static FORCEINLINE bool Chance16R(const uint a, const uint b, uint32 &r)
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static inline bool Chance16R(const uint a, const uint b, uint32 &r)
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{
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r = Random();
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return Chance16I(a, b, r);
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}
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#endif /* RANDOM_DEBUG */
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#endif /* RANDOM_FUNC_HPP */
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