From 0a2c440a773831883b75ce909903345b61ce8caf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Branimir=20Karad=C5=BEi=C4=87?= <branimirkaradzic@gmail.com>
Date: Mon, 16 Oct 2017 08:41:05 -0700
Subject: [PATCH] Added step and smoothstep.

---
 include/bx/easing.h          | 55 ++++++++++++++++++++++++++++++++++++
 include/bx/inline/easing.inl | 10 +++++++
 src/easing.cpp               |  2 ++
 3 files changed, 67 insertions(+)

diff --git a/include/bx/easing.h b/include/bx/easing.h
index 5c34918..9684903 100644
--- a/include/bx/easing.h
+++ b/include/bx/easing.h
@@ -20,6 +20,8 @@ namespace bx
 		enum Enum
 		{
 			Linear,
+			Step,
+			SmoothStep,
 			InQuad,
 			OutQuad,
 			InOutQuad,
@@ -97,6 +99,57 @@ namespace bx
 	///
 	float easeLinear(float _t);
 
+	/// Step.
+	///
+	///      ^
+	///      |
+	///      |
+	///      |
+	///      |
+	///      |                                ********************************
+	///      |
+	///      |
+	///      |
+	///      |
+	///      |
+	///      |
+	///      |
+	///      |
+	///      |
+	///      +********************************-------------------------------->
+	///      |
+	///      |
+	///      |
+	///      |
+	///      |
+	///
+	float easeStep(float _t);
+
+	/// Smooth step.
+	///
+	///      |
+	///      |
+	///      |
+	///      |
+	///      |
+	///      |                                                   *************
+	///      |                                             *******
+	///      |                                        ******
+	///      |                                    *****
+	///      |                                *****
+	///      |                           *****
+	///      |                       *****
+	///      |                  ******
+	///      |            *******
+	///      +*************--------------------------------------------------->
+	///      |
+	///      |
+	///      |
+	///      |
+	///      |
+	///
+	float easeSmoothStep(float _t);
+
 	/// Quad.
 	///
 	///      ^
@@ -1137,6 +1190,8 @@ namespace bx
 	///
 	float easeOutInBounce(float _t);
 
+	float easeInOutLinear(float _t);
+
 } // namespace bx
 
 #include "inline/easing.inl"
diff --git a/include/bx/inline/easing.inl b/include/bx/inline/easing.inl
index a422d73..d1e64ed 100644
--- a/include/bx/inline/easing.inl
+++ b/include/bx/inline/easing.inl
@@ -29,6 +29,16 @@ namespace bx
 		return _t;
 	}
 
+	inline float easeStep(float _t)
+	{
+		return _t < 0.5f ? 0.0f : 1.0f;
+	}
+
+	inline float easeSmoothStep(float _t)
+	{
+		return fsq(_t)*(3.0f - 2.0f*_t);
+	}
+
 	inline float easeInQuad(float _t)
 	{
 		return fsq(_t);
diff --git a/src/easing.cpp b/src/easing.cpp
index 1f82fce..2c37025 100644
--- a/src/easing.cpp
+++ b/src/easing.cpp
@@ -10,6 +10,8 @@ namespace bx
 	static const EaseFn s_easeFunc[] =
 	{
 		easeLinear,
+		easeStep,
+		easeSmoothStep,
 		easeInQuad,
 		easeOutQuad,
 		easeInOutQuad,