From Art Tevs,

"A new texture class Texture2DArray derived from
Texture extends the osg to support the new
EXT_texture_array extensions. Texture arrays provides
a feature for people interesting in GPGPU programming.


Faetures and changes:

- Full support for layered 2D textures.

- New uniform types were added (sampler2DArray)

- FrameBufferObject implementation were changed to
support attaching of 2D array textures to the
framebuffer

- StateSet was slightly changed to support texture
arrays. NOTE: array textures can not be used in fixed
function pipeline. Thus using the layered texture as a
statemode for a Drawable produce invalid enumerant
OpenGL errors.

- Image class was extended to support handling of
array textures

Tests:
I have used this class as a new feature of my
application. It works for me without problems (Note:
Texture arrays were introduced only for shading
languages and not for fixed function pipelines!!!).
RTT with Texture2DArray works, as I have tested them
as texture targets for a camera with 6 layers/faces
(i.e. replacement for cube maps). I am using the array
textures in shader programming. Array textures can be
attached to the FBO and used as input and as output."

include/osg/GL2Extensions

@@ -1,6 +1,7 @@
 /* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
  * Copyright (C) 2003-2005 3Dlabs Inc. Ltd.
  * Copyright (C) 2004-2005 Nathan Cournia
+ * Copyright (C) 2007 Art Tevs
  *
  * This application is open source and may be redistributed and/or modified   
  * freely and without restriction, both in commericial and non commericial
@@ -23,6 +24,17 @@
 
 #include <string>
 
+#ifndef GL_VERSION_2_1    //[
+#define GL_VERSION_2_1 1
+
+#define GL_SAMPLER_1D_ARRAY_EXT           0x8DC0
+#define GL_SAMPLER_2D_ARRAY_EXT           0x8DC1
+#define GL_SAMPLER_1D_ARRAY_SHADOW_EXT    0x8DC3
+#define GL_SAMPLER_2D_ARRAY_SHADOW_EXT    0x8DC4
+
+#endif //]
+
+
 #ifndef GL_VERSION_2_0    //[
 #define GL_VERSION_2_0 1
 typedef char GLchar;