Added Macro's new cube map generation classes and osgcubemap demo.

include/osgUtil/HalfWayMapGenerator

@@ -0,0 +1,41 @@
+#ifndef OSGUTIL_HALFWAYMAPGENERATOR_
+#define OSGUTIL_HALFWAYMAPGENERATOR_
+
+#include <osgUtil/Export>
+
+#include <osgUtil/CubeMapGenerator>
+
+namespace osgUtil
+{
+
+	/** This cube map generator produces an Half-way vector map, useful for 
+	    hardware-based specular lighting effects.
+	    It computes: C = normalize(R - L), where C is the resulting color, 
+	    R is the reflection vector and L is the light direction.
+	*/
+	class OSGUTIL_EXPORT HalfWayMapGenerator: public CubeMapGenerator {
+	public:
+		HalfWayMapGenerator(const osg::Vec3 &light_direction, int texture_size = 64);
+		HalfWayMapGenerator(const HalfWayMapGenerator &copy, const osg::CopyOp &copyop);
+
+	protected:
+		virtual ~HalfWayMapGenerator() {}
+		HalfWayMapGenerator &operator=(const HalfWayMapGenerator &) { return *this; }
+
+		inline virtual osg::Vec4 compute_color(const osg::Vec3 &R) const;
+
+	private:
+		osg::Vec3 ldir_;
+	};
+
+	// INLINE METHODS
+
+	inline osg::Vec4 HalfWayMapGenerator::compute_color(const osg::Vec3 &R) const
+	{
+		const osg::Vec3 V = (R / R.length()) - ldir_;
+		return vector_to_color(V / V.length());
+	}
+
+}
+
+#endif