crnlib/crn_rand.h

@@ -0,0 +1,114 @@
+// File: crn_rand.h
+// See Copyright Notice and license at the end of inc/crnlib.h
+#pragma once 
+
+namespace crnlib
+{
+   class kiss99
+   {
+   public:
+      kiss99();
+            
+      void seed(uint32 i, uint32 j, uint32 k);
+            
+      inline uint32 next();
+      
+   private:
+      uint32 x;
+      uint32 y;
+      uint32 z;
+      uint32 c;
+   };
+      
+   class well512
+   {
+   public:
+      well512();
+      
+      enum { cStateSize = 16 };
+      void seed(uint32 seed[cStateSize]);
+      void seed(uint32 seed);
+      void seed(uint32 seed1, uint32 seed2, uint32 seed3);
+            
+      inline uint32 next();
+   
+   private:      
+      uint32 m_state[cStateSize];
+      uint32 m_index;
+   };
+   
+   class ranctx 
+   { 
+   public:
+      ranctx() { seed(0xDE149737); }
+            
+      void seed(uint32 seed);
+      
+      inline uint32 next();
+   
+   private:
+      uint32 a; 
+      uint32 b; 
+      uint32 c; 
+      uint32 d; 
+   };
+   
+   class random
+   {
+   public:
+      random();
+      random(uint32 i);
+      
+      void seed(uint32 i);
+      void seed(uint32 i1, uint32 i2, uint32 i3);
+            
+      uint32 urand32();
+      
+      // "Fast" variant uses no multiplies.
+      uint32 fast_urand32();
+      
+      uint32 bit();
+      
+      // Returns random between [0, 1)
+      double drand(double l, double h);
+      
+      float frand(float l, float h);
+      
+      // Returns random between [l, h)
+      int irand(int l, int h);
+                  
+      double gaussian(double mean, double stddev);
+      
+      void test();
+
+   private:
+      ranctx m_ranctx;
+      kiss99 m_kiss99;
+      well512 m_well512;
+   };
+   
+   // Simpler, minimal state PRNG
+   class fast_random
+   {
+   public:
+      fast_random();
+      fast_random(uint32 i);
+      fast_random(const fast_random& other);
+      fast_random& operator=(const fast_random& other);
+            
+      void seed(uint32 i);
+      
+      uint32 urand32();
+      
+      int irand(int l, int h);
+      
+      double drand(double l, double h);
+
+      float frand(float l, float h);
+      
+   private:      
+      uint32 jsr;
+      uint32 jcong;
+   };
+
+} // namespace crnlib