OpenGL rebuild project start!

2023-04-29 03:06:32 +08:00
parent 7dba067146
commit 4dd3f4f6d1
263 changed files with 51374 additions and 1522 deletions
@@ -0,0 +1,85 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace StgSharp.Math
+{
+    public static unsafe partial class Calc
+    {
+        public static unsafe float ATan(float x)
+        {
+            float sign = 1, angle = 0;
+            if (x < 0)
+            {
+                sign = -1;
+                x = -x;
+            }
+            uint xBit = *(uint*)&x;
+            int xExp = (int)(xBit >> 23) - 127;
+            if (xExp >= 26)
+            {
+                return 1;
+            }
+            if (xExp <= -15)
+            {
+                return x;
+            }
+            if (xExp >= 0)
+            {
+                x = (x - 1) / (x + 1);
+                angle = 0.7853981634f;
+            }
+
+            float v = 0.7853981634f * x + x * (1 - x) * (0.2447f+0.0663f * x);
+            v += angle;
+            v *= sign;
+
+            return v;
+
+
+        }
+
+
+        public static unsafe float ATan(float x, float y)
+        {
+
+
+            float z = y / x;
+
+            float sign = 1, angle = 0,angle2 = 0;
+            if (x<0)
+            {
+                angle = -3.1415926535f ;
+            }
+            if (z < 0)
+            {
+                sign = -1;
+                z = -z;
+            }
+            uint zBit = *(uint*)&z;
+            int zExp = (int)(zBit >> 23) - 127;
+            if (zExp >= 26)
+            {
+                return 1;
+            }
+            if (zExp <= -15)
+            {
+                return z;
+            }
+            if (zExp >= 0)
+            {
+                z = (z - 1) / (z + 1);
+                angle2 = 0.7853981634f;
+            }
+
+            float v = 0.7853981634f * z + z * (1 - z) * (0.2447f + 0.0663f * z);
+            v *= 57.29577951f;
+            v += angle2;
+            v += angle;
+            v *= sign;
+
+            return v;
+
+        }
+    }
+}