- Add core::iszero and core::squareroot for s64 type.

- line2d::getLength now returning type T. f64 would actually be fine, but then it has to be used throughout, here the cast to T happens before already, so returning f64 is just confusing as looks like it would return a greater accuracy than it has at that point.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4115 dfc29bdd-3216-0410-991c-e03cc46cb475

include/irrMath.h

@@ -248,6 +248,12 @@ namespace core
 		return a <= tolerance;
 	}
 
+	//! returns if a equals zero, taking rounding errors into account
+	inline bool iszero(const s64 a, const s64 tolerance = 0)
+	{
+		return abs_(a) > tolerance;
+	}
+
 	inline s32 s32_min(s32 a, s32 b)
 	{
 		const s32 mask = (a - b) >> 31;
@@ -429,6 +435,12 @@ namespace core
 		return static_cast<s32>(squareroot(static_cast<f32>(f)));
 	}
 
+	// calculate: sqrt ( x )
+	REALINLINE s64 squareroot(const s64 f)
+	{
+		return static_cast<s64>(squareroot(static_cast<f64>(f)));
+	}
+
 	// calculate: 1 / sqrt ( x )
 	REALINLINE f64 reciprocal_squareroot(const f64 x)
 	{

include/line2d.h

@@ -50,7 +50,7 @@ class line2d
 
 		//! Get length of line
 		/** \return Length of the line. */
-		f64 getLength() const { return start.getDistanceFrom(end); }
+		T getLength() const { return start.getDistanceFrom(end); }
 
 		//! Get squared length of the line
 		/** \return Squared length of line. */