Adding degToRad() and radToDeg() convenience functions, per a suggestion on...

Adding degToRad() and radToDeg() convenience functions, per a suggestion on #Irrlicht.  Exercised with trivial test cases.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@1720 dfc29bdd-3216-0410-991c-e03cc46cb475

include/irrMath.h

@@ -71,6 +71,42 @@ namespace core
 	//! 64bit constant for converting from radians to degrees
 	const f64 RADTODEG64 = 180.0 / PI64;
 
+	//! Utility function to convert a radian value to degrees
+	/** Provided as it can be clearer to write radToDeg(X) than RADTODEG * X
+	\param radians	The radians value to convert to degrees.
+	*/
+	inline f32 radToDeg(f32 radians)
+	{
+		return RADTODEG * radians;
+	}
+
+	//! Utility function to convert a radian value to degrees
+	/** Provided as it can be clearer to write radToDeg(X) than RADTODEG * X
+	\param radians	The radians value to convert to degrees.
+	*/
+	inline f64 radToDeg(f64 radians)
+	{
+		return RADTODEG64 * radians;
+	}
+
+	//! Utility function to convert a degrees value to radians
+	/** Provided as it can be clearer to write degToRad(X) than DEGTORAD * X
+	\param degrees	The degrees value to convert to radians.
+	*/
+	inline f32 degToRad(f32 degrees)
+	{
+		return DEGTORAD * degrees;
+	}
+
+	//! Utility function to convert a degrees value to radians
+	/** Provided as it can be clearer to write degToRad(X) than DEGTORAD * X
+	\param degrees	The degrees value to convert to radians.
+	*/
+	inline f64 degToRad(f64 degrees)
+	{
+		return DEGTORAD64 * degrees;
+	}
+
 	//! returns minimum of two values. Own implementation to get rid of the STL (VS6 problems)
 	template<class T>
 	inline const T& min_(const T& a, const T& b)