From Bob Kuehne, added osg::getGlVersion() and fixed a minor typo in Texture3D.

include/osg/GLExtensions

@@ -20,6 +20,12 @@
 
 namespace osg {
 
+/** Return floating-point OpenGL version number.
+  * Note: Must only be called within a valid OpenGL context,
+  * undefined behavior may occur otherwise.
+*/
+extern OSG_EXPORT float getGLVersionNumber();
+
 /** Return true if OpenGL "extension" is supported.
   * Note: Must only be called within a valid OpenGL context,
   * undefined behavior may occur otherwise.

include/osg/Texture3D

@@ -144,7 +144,7 @@ class OSG_EXPORT Texture3D : public Texture
                 
                 void lowestCommonDenominator(const Extensions& rhs);
                     
-                void setupGLExtenions(unsigned int contextID);
+                void setupGLExtensions(unsigned int contextID);
 
                 void setTexture3DSupported(bool flag) { _isTexture3DSupported=flag; }
                 bool isTexture3DSupported() const { return _isTexture3DSupported; }