add from giga-device, new branch added

2025-08-21 16:51:25 +08:00
commit 43bbc06bbb
1296 changed files with 264186 additions and 0 deletions
@@ -0,0 +1,110 @@
+//-----------------------------------------------------------------------
+//-----------------------------------------------------------------------
+//     file="ACos.cs"
+//     Project: StgSharp
+//     AuthorGroup: Nitload Space
+//     Copyright (c) Nitload Space. All rights reserved.
+//     
+//     Permission is hereby granted, free of charge, to any person 
+//     obtaining a copy of this software and associated documentation 
+//     files (the “Software”), to deal in the Software without restriction, 
+//     including without limitation the rights to use, copy, modify, merge,
+//     publish, distribute, sublicense, and/or sell copies of the Software, 
+//     and to permit persons to whom the Software is furnished to do so, 
+//     subject to the following conditions:
+//     
+//     The above copyright notice and 
+//     this permission notice shall be included in all copies 
+//     or substantial portions of the Software.
+//     
+//     THE SOFTWARE IS PROVIDED “AS IS”, 
+//     WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
+//     INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+//     FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
+//     IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
+//     DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 
+//     ARISING FROM, OUT OF OR IN CONNECTION WITH 
+//     THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//     
+//-----------------------------------------------------------------------
+//-----------------------------------------------------------------------
+using System;
+using System.Runtime.CompilerServices;
+
+namespace StgSharp.Mathematics
+{
+    public static unsafe partial class Scaler
+    {
+
+        [MethodImpl( MethodImplOptions.AggressiveInlining )]
+        public static unsafe float ACos( float x )
+        {
+            return MathF.Acos( x );
+
+            /*
+                        int sign = 1;
+                        float y;
+
+                        if (x < 0)
+                        {
+                            sign = -1;
+                            y = -x;
+                        }
+                        else
+                        {
+                            y = x;
+                        }
+
+                        if (x > 1)
+                        {
+                            throw new ArgumentException();
+                        }
+
+                        float r, s, u, vec = 0.0f;
+                        bool transform = (y >= 0.5f);
+
+                        if (transform)
+                        {
+                            r = 0.5f * (1.0f - y);
+                            s = Scaler.Sqrt(r);
+                            y = s;
+                        }
+                        else
+                        {
+                            r = y * y;
+                        }
+                        u = r * (0.184161606965100694821398249421F +
+                               (-0.0565298683201845211985026327361F +
+                               (-0.0133819288943925804214011424456F -
+                               0.00396137437848476485201154797087F * r) * r) * r) /
+                              (1.10496961524520294485512696706F -
+                               0.836411276854206731913362287293F * r);
+                        /*
+
+            if (transform)
+            {
+                float c, s1, p, q;
+                uint us;
+
+                us = *(uint*)&s;
+                uint uss = us & 0xffff0000;
+                s1 = *(float*)&uss;
+
+                c = (r - s1 * s1) / (s + s1);
+                p = 2.0F * s * u - (piby2_tail - 2.0F * c);
+                q = hpiby2_head - 2.0F * s1;
+                vec = hpiby2_head - (p - q);
+            }
+            else
+            {
+                vec = y + y * u;
+            }
+
+            vec = sign * vec;
+
+            return piby2 - vec;
+            */
+        }
+
+    }
+}