1 files changed, 73 insertions, 0 deletions
diff --git a/Source/Math/mat3.cpp b/Source/Math/mat3.cpp
new file mode 100644
index 00000000..214ca783
--- /dev/null
+++ b/Source/Math/mat3.cpp
@@ -0,0 +1,73 @@
+//-----------------------------------------------------------------------------
+//           Name: mat3.cpp
+//      Developer: Wolfire Games LLC
+//    Description:
+//        License: Read below
+//-----------------------------------------------------------------------------
+//
+//   Copyright 2022 Wolfire Games LLC
+//
+//   Licensed under the Apache License, Version 2.0 (the "License");
+//   you may not use this file except in compliance with the License.
+//   You may obtain a copy of the License at
+//
+//       http://www.apache.org/licenses/LICENSE-2.0
+//
+//   Unless required by applicable law or agreed to in writing, software
+//   distributed under the License is distributed on an "AS IS" BASIS,
+//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//   See the License for the specific language governing permissions and
+//   limitations under the License.
+//
+//-----------------------------------------------------------------------------
+#include "mat3.h"
+
+#include <memory>
+#include <cstring>
+
+mat3::mat3(float val)
+{
+    entries[0] = val;
+    entries[4] = val;
+    entries[8] = val;
+    entries[3] = entries[2] = entries[1] = 0.0f;
+    entries[7] = entries[6] = entries[5] = 0.0f;
+}
+mat3::mat3(float e0, float e1, float e2,
+          float e3, float e4, float e5,
+          float e6, float e7, float e8)
+{
+    entries[0] = e0;
+    entries[1] = e1;
+    entries[2] = e2;
+    entries[3] = e3;
+    entries[4] = e4;
+    entries[5] = e5;
+    entries[6] = e6;
+    entries[7] = e7;
+    entries[8] = e8;
+    
+}        
+mat3::mat3(const float * rhs)
+{
+    memcpy(entries,rhs,sizeof(entries));
+}
+
+mat3::mat3(const mat4& m)
+{
+    entries[0] = m[0];
+    entries[1] = m[1];
+    entries[2] = m[2];
+    entries[3] = m[4];
+    entries[4] = m[5];
+    entries[5] = m[6];
+    entries[6] = m[8];
+    entries[7] = m[9];
+    entries[8] = m[10];
+}
+
+vec3 mat3::operator*(const vec3 &rhs) const {
+    return vec3(entries[0]*rhs[0] + entries[3]*rhs[1] + entries[6]*rhs[2],
+                entries[1]*rhs[0] + entries[4]*rhs[1] + entries[7]*rhs[2],
+                entries[2]*rhs[0] + entries[5]*rhs[1] + entries[8]*rhs[2]);
+}