daily uodate on 20231208 by nitload youmu, preparation for multi thread rendering

源代码/StgSharp/Math/Linear/vec2d.cs

@@ -10,7 +10,7 @@ namespace StgSharp.Math
     /// Vec2Ds in StgSharp are defaultly usaed as colum vector. 
     /// </summary>
 
-    [StructLayout(LayoutKind.Explicit, Size = 16,Pack = 16)]
+    [StructLayout(LayoutKind.Explicit, Size = 16, Pack = 16)]
     public struct Vec2d
     {
 
@@ -27,6 +27,11 @@ namespace StgSharp.Math
             X = x; Y = y;
         }
 
+        public static Vec2d Zero
+        {
+            get { return new Vec2d(0, 0); }
+        }
+
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static Vec2d operator +(Vec2d vec1, Vec2d vec2)
         {
@@ -61,7 +66,20 @@ namespace StgSharp.Math
                 );
         }
 
+        public static bool operator ==(Vec2d left, Vec2d right)
+        {
+            return left.X == right.X && left.Y == right.Y;
+        }
 
+        public static bool operator !=(Vec2d left, Vec2d right)
+        {
+            return !(left == right);
+        }
+
+        public float Cross(Vec2d right)
+        {
+            return X * right.Y - Y * right.X;
+        }
 
     }
 }