daily update on 20230724 by nitload youmu, bigM128map added

源代码/StgSharp/Math/Scalar/Random.cs

@@ -0,0 +1,64 @@
+using StgSharp.Control;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace StgSharp.Math
+{
+    public static unsafe partial class Calc
+    {
+
+        internal static float currentSeed
+#if DEBUG    
+            = 0.5f;
+#else
+        = Calc.Abs(System.DateTime.UtcNow.GetHashCode());
+#endif
+
+        /// <summary>
+        /// returns a random float number between 0 and 1.
+        /// </summary>
+        /// <returns></returns>
+
+        public static unsafe float Random()
+        { 
+            float seed = currentSeed;
+
+            float sample = Calc.Pow(Calc.Sqrt(seed),2);
+            float sample2 = (sample - seed) / seed;
+            sample2 = Calc.Abs(sample2);
+
+            if (sample==1)
+            {
+                sample = sample2;
+            }
+            
+            currentSeed = sample;
+            sample2 *= 1000000;
+
+            float result = sample2-(int)sample2;
+            if (result == 0)
+            {
+                currentSeed = sample2+0.1f;
+                result = Calc.Random();
+            }
+            return result;
+
+        }
+
+        /// <summary>
+        /// Generates a random seed in int value.
+        /// </summary>
+        /// <returns></returns>
+        public static unsafe int RandomSeed()
+        {
+            float seedValue1 = Random();
+            float seedValue2 = Random();
+            uint seedValueBits = *(uint*)&seedValue1;
+
+            float seedValue = seedValueBits * seedValue2;
+
+            return *(int*)&seedValue;
+        }
+    }
+}

源代码/StgSharp/Math/Scalar/Sqrt.cs

@@ -34,7 +34,7 @@ namespace StgSharp.Math
             {
                 throw new ArgumentOutOfRangeException();
             }
-            if (x == 0)
+            if (x <= 1e-12)
             {
                 return 0;
             }