X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=simgear%2Fmath%2FSGVec4.hxx;h=4339dfd9b79879a3fab0da2b59a5cca747cc5578;hb=584ee1364f25e5c3795f9ff4633a792cba39bfc7;hp=baf9137daa2aba31e290c5c81a022f72d2254847;hpb=9cbbe5559844317f44744788ddb308101a1e75e9;p=simgear.git

diff --git a/simgear/math/SGVec4.hxx b/simgear/math/SGVec4.hxx
index baf9137d..4339dfd9 100644
--- a/simgear/math/SGVec4.hxx
+++ b/simgear/math/SGVec4.hxx
@@ -18,10 +18,7 @@
 #ifndef SGVec4_H
 #define SGVec4_H
 
-#ifndef NO_OPENSCENEGRAPH_INTERFACE
-#include <osg/Vec4f>
-#include <osg/Vec4d>
-#endif
+#include <iosfwd>
 
 /// 4D Vector Class
 template<typename T>
@@ -247,6 +244,19 @@ max(S s, const SGVec4<T>& v)
                    SGMisc<T>::max(s, v(3)));
 }
 
+/// Add two vectors taking care of (integer) overflows. The values are limited
+/// to the respective minimum and maximum values.
+template<class T>
+SGVec4<T> addClipOverflow(SGVec4<T> const& lhs, SGVec4<T> const& rhs)
+{
+  return SGVec4<T>(
+    SGMisc<T>::addClipOverflow(lhs.x(), rhs.x()),
+    SGMisc<T>::addClipOverflow(lhs.y(), rhs.y()),
+    SGMisc<T>::addClipOverflow(lhs.z(), rhs.z()),
+    SGMisc<T>::addClipOverflow(lhs.w(), rhs.w())
+  );
+}
+
 /// Scalar dot product
 template<typename T>
 inline
@@ -288,7 +298,12 @@ template<typename T>
 inline
 SGVec4<T>
 normalize(const SGVec4<T>& v)
-{ return (1/norm(v))*v; }
+{
+  T normv = norm(v);
+  if (normv <= SGLimits<T>::min())
+    return SGVec4<T>::zeros();
+  return (1/normv)*v;
+}
 
 /// Return true if exactly the same
 template<typename T>
@@ -383,6 +398,18 @@ T
 distSqr(const SGVec4<T>& v1, const SGVec4<T>& v2)
 { SGVec4<T> tmp = v1 - v2; return dot(tmp, tmp); }
 
+// calculate the projection of u along the direction of d.
+template<typename T>
+inline
+SGVec4<T>
+projection(const SGVec4<T>& u, const SGVec4<T>& d)
+{
+  T denom = dot(d, d);
+  T ud = dot(u, d);
+  if (SGLimits<T>::min() < denom) return u;
+  else return d * (dot(u, d) / denom);
+}
+
 #ifndef NDEBUG
 template<typename T>
 inline
@@ -411,26 +438,4 @@ SGVec4d
 toVec4d(const SGVec4f& v)
 { return SGVec4d(v(0), v(1), v(2), v(3)); }
 
-#ifndef NO_OPENSCENEGRAPH_INTERFACE
-inline
-SGVec4d
-toSG(const osg::Vec4d& v)
-{ return SGVec4d(v[0], v[1], v[2], v[3]); }
-
-inline
-SGVec4f
-toSG(const osg::Vec4f& v)
-{ return SGVec4f(v[0], v[1], v[2], v[3]); }
-
-inline
-osg::Vec4d
-toOsg(const SGVec4d& v)
-{ return osg::Vec4d(v[0], v[1], v[2], v[3]); }
-
-inline
-osg::Vec4f
-toOsg(const SGVec4f& v)
-{ return osg::Vec4f(v[0], v[1], v[2], v[3]); }
-#endif
-
 #endif