- CMatrix4<T>::getInverse working now with FLT_MIN instead of...

- CMatrix4<T>::getInverse working now with FLT_MIN instead of ROUNDING_ERROR_f32 which fixes a bug reported by amin here: http://irrlicht.sourceforge.net/forum/viewtopic.php?f=7&t=47422
NOTE: There's a good chance that this should be changed in more places where iszero is used, as that check is often about avoiding a division by 0. 

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4343 dfc29bdd-3216-0410-991c-e03cc46cb475

include/irrMath.h

@@ -31,6 +31,10 @@
 #define FLT_MAX 3.402823466E+38F
 #endif
 
+#ifndef FLT_MIN
+#define FLT_MIN 1.17549435e-38F
+#endif
+
 namespace irr
 {
 namespace core

include/matrix4.h

@@ -1326,7 +1326,7 @@ namespace core
 			(m(0, 1) * m(1, 3) - m(0, 3) * m(1, 1)) * (m(2, 0) * m(3, 2) - m(2, 2) * m(3, 0)) +
 			(m(0, 2) * m(1, 3) - m(0, 3) * m(1, 2)) * (m(2, 0) * m(3, 1) - m(2, 1) * m(3, 0));
 
-		if( core::iszero ( d ) )
+		if( core::iszero ( d, FLT_MIN ) )
 			return false;
 
 		d = core::reciprocal ( d );