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/Texture

@@ -156,6 +156,10 @@
 #define GL_TEXTURE_3D                     0x806F
 #endif
 
+#ifndef GL_TEXTURE_2D_ARRAY_EXT
+#define GL_TEXTURE_2D_ARRAY_EXT           0x8C1A
+#endif
+
 #ifndef GL_TEXTURE_BINDING_3D
 #define GL_TEXTURE_BINDING_3D             0x806A
 #endif