From 1e2c597fb62a40e4401e53a4cc783a316365ca1c Mon Sep 17 00:00:00 2001
From: "Kearwood \"Kip\" Gilbert" <kearwood@kearwood.com>
Date: Mon, 19 Mar 2018 17:28:31 -0700
Subject: [PATCH] Added Matrix4::Identity(), Added Lerp (scalar.h)

---
 include/matrix4.h | 1 +
 include/scalar.h  | 1 +
 src/matrix4.cpp   | 7 +++++++
 src/scalar.cpp    | 5 +++++
 4 files changed, 14 insertions(+)

diff --git a/include/matrix4.h b/include/matrix4.h
index b58f097..5c787f8 100644
--- a/include/matrix4.h
+++ b/include/matrix4.h
@@ -107,6 +107,7 @@ public:
   static Matrix4 Translation(const Vector3 &v);
   static Matrix4 Rotation(const Vector3 &v);
   static Matrix4 Scaling(const Vector3 &v);
+  static Matrix4 Identity();
 };
 static_assert(std::is_pod<Matrix4>::value, "kraken::Matrix4 must be a POD type.");
 
diff --git a/include/scalar.h b/include/scalar.h
index 5dd0423..dc74a55 100644
--- a/include/scalar.h
+++ b/include/scalar.h
@@ -35,6 +35,7 @@
 namespace kraken {
 
   float SmoothStep(float a, float b, float t);
+  float Lerp(float a, float b, float t);
 
 }; // namespace kraken
 
diff --git a/src/matrix4.cpp b/src/matrix4.cpp
index e0be521..eec7cea 100644
--- a/src/matrix4.cpp
+++ b/src/matrix4.cpp
@@ -441,5 +441,12 @@ Matrix4 Matrix4::Scaling(const Vector3 &v)
     return m;
 }
 
+Matrix4 Matrix4::Identity()
+{
+    Matrix4 m;
+    m.init();
+    return m;
+}
+
 } // namespace kraken
 
diff --git a/src/scalar.cpp b/src/scalar.cpp
index 5f6d374..aadf574 100644
--- a/src/scalar.cpp
+++ b/src/scalar.cpp
@@ -39,4 +39,9 @@ float SmoothStep(float a, float b, float t)
     return a * (1.0f - d) + b * d;
 }
 
+float Lerp(float a, float b, float t)
+{
+  return (a + (b - a) * t);
+}
+
 } // namespace kraken