Added osg::TextureCubeMap. submission from Brede Johansen.

include/osg/TextureCubeMap

@@ -0,0 +1,64 @@
+//C++ header - Open Scene Graph - Copyright (C) 1998-2001 Robert Osfield
+//Distributed under the terms of the GNU Library General Public License (LGPL)
+//as published by the Free Software Foundation.
+
+// -*-c++-*-
+
+#ifndef OSG_TEXTURECUBEMAP
+#define OSG_TEXTURECUBEMAP 1
+
+#include <osg/Texture>
+
+
+namespace osg {
+
+/** TextureCubeMap state class which encapsulates OpenGl texture cubemap functionality.*/
+class SG_EXPORT TextureCubeMap : public Texture
+{
+
+    public :
+        
+        TextureCubeMap();
+
+        /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
+        TextureCubeMap(const TextureCubeMap& cm,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
+            Texture(cm,copyop) {}
+
+        META_StateAttribute(TextureCubeMap,(Type)(TEXTURE_0+_textureUnit));
+        
+        /** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/
+        virtual int compare(const StateAttribute& rhs) const;
+
+        enum Face {
+            POSITIVE_X=0,
+            NEGATIVE_X=1,
+            POSITIVE_Y=2,
+            NEGATIVE_Y=3,
+            POSITIVE_Z=4,
+            NEGATIVE_Z=5
+        };
+
+        /** Set the texture image. */
+        void setImage( const Face, Image* image);
+
+        /** On first apply (unless already compiled), create the minmapped 
+          * texture and bind it, subsequent apply will simple bind to texture.*/
+        virtual void apply(State& state) const;
+
+        /** Method which does the creation of the texture itself, and
+          * does not set or use texture binding. */
+        virtual void applyImmediateMode(State& state) const;
+        virtual void applyFaceImmediateMode(GLenum facetarget, Image* image, State& state) const;
+
+    protected :
+
+        virtual ~TextureCubeMap();
+        bool imagesValid() const;
+        void setImage(Image* image) {}  // prevent call to Texture::setImage(Image* image)
+
+        mutable ref_ptr<Image> _images[6];
+};
+
+}
+
+#endif