From d00926894ee09664dfd638cc43079f03add2051d Mon Sep 17 00:00:00 2001
From: Kelly Thomas <kelly.thomas@hotmail.com.au>
Date: Sun, 20 May 2018 18:29:54 +0800
Subject: [PATCH] mono: add Slerp method to vector classes, expose Cross method
 for Vector2, and fix unnecessary casts in Basis

(cherry picked from commit b335274bcd6df9ad7e4ba381574fd1607f2b3437)
---
 modules/mono/glue/cs_files/Basis.cs    | 6 +++---
 modules/mono/glue/cs_files/VERSION.txt | 2 +-
 modules/mono/glue/cs_files/Vector2.cs  | 8 +++++++-
 modules/mono/glue/cs_files/Vector3.cs  | 6 ++++++
 4 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/modules/mono/glue/cs_files/Basis.cs b/modules/mono/glue/cs_files/Basis.cs
index 270f3b80a2b..aa49a5e04f4 100644
--- a/modules/mono/glue/cs_files/Basis.cs
+++ b/modules/mono/glue/cs_files/Basis.cs
@@ -453,15 +453,15 @@ namespace Godot
 
             c = Mathf.Cos(euler.x);
             s = Mathf.Sin(euler.x);
-            var xmat = new Basis((real_t)1.0, (real_t)0.0, (real_t)0.0, (real_t)0.0, c, -s, (real_t)0.0, s, c);
+            var xmat = new Basis(1, 0, 0, 0, c, -s, 0, s, c);
 
             c = Mathf.Cos(euler.y);
             s = Mathf.Sin(euler.y);
-            var ymat = new Basis(c, (real_t)0.0, s, (real_t)0.0, (real_t)1.0, (real_t)0.0, -s, (real_t)0.0, c);
+            var ymat = new Basis(c, 0, s, 0, 1, 0, -s, 0, c);
 
             c = Mathf.Cos(euler.z);
             s = Mathf.Sin(euler.z);
-            var zmat = new Basis(c, -s, (real_t)0.0, s, c, (real_t)0.0, (real_t)0.0, (real_t)0.0, (real_t)1.0);
+            var zmat = new Basis(c, -s, 0, s, c, 0, 0, 0, 1);
 
             this = ymat * xmat * zmat;
         }
diff --git a/modules/mono/glue/cs_files/VERSION.txt b/modules/mono/glue/cs_files/VERSION.txt
index 0cfbf08886f..00750edc07d 100755
--- a/modules/mono/glue/cs_files/VERSION.txt
+++ b/modules/mono/glue/cs_files/VERSION.txt
@@ -1 +1 @@
-2
+3
diff --git a/modules/mono/glue/cs_files/Vector2.cs b/modules/mono/glue/cs_files/Vector2.cs
index cc2cda82fb6..2dfee5e513a 100644
--- a/modules/mono/glue/cs_files/Vector2.cs
+++ b/modules/mono/glue/cs_files/Vector2.cs
@@ -62,7 +62,7 @@ namespace Godot
             }
         }
 
-        private real_t Cross(Vector2 b)
+        public real_t Cross(Vector2 b)
         {
             return x * b.y - y * b.x;
         }
@@ -200,6 +200,12 @@ namespace Godot
             x = v.x;
             y = v.y;
         }
+        
+        public Vector2 Slerp(Vector2 b, real_t t)
+        {
+            real_t theta = AngleTo(b);
+            return Rotated(theta * t);
+        }
 
         public Vector2 Slide(Vector2 n)
         {
diff --git a/modules/mono/glue/cs_files/Vector3.cs b/modules/mono/glue/cs_files/Vector3.cs
index 0a71f3fa4d6..259a8e063de 100644
--- a/modules/mono/glue/cs_files/Vector3.cs
+++ b/modules/mono/glue/cs_files/Vector3.cs
@@ -237,6 +237,12 @@ namespace Godot
             z = v.z;
         }
 
+        public Vector3 Slerp(Vector3 b, real_t t)
+        {
+            real_t theta = AngleTo(b);
+            return Rotated(Cross(b), theta * t);
+        }
+
         public Vector3 Slide(Vector3 n)
         {
             return this - n * Dot(n);