[osg-submissions] EXT_texture_integer submission ShaderModel 4.0

[Art Tevs]

Hi folks,

I attached a patch to the latest osg svn, which does
implement integer textures as in the Shader Model 4.0 


Features:
32, 16 and 8 bit unsigned and signed integer textures.
see EXT_texture_integer for more details
New Vector types added Vec2i, Vec2ui, Vec3i, Vec3ui,
Vec4i, Vec4ui


Testings:
- I have tested it by loading a raw integer image into
a texture. Texture was readable by the fragment
shader. 

- Write to integer texture is more tricky, since it
require changings to the Shader.cpp (thus will follow
next days)


ToDo:
- Robert please correct following in the
Texture2DArray submission, which I have submitted
before:
void Texture2DArray::computeInternalFormat() const
{
    if(_image.valid())
computeInternalFormatWithImage(*_image); 
    else checkIntegerInternalFormat();
}

- Please add new Vec*i and Vec*ui into the list of
include files which will be installed (since I am not
able to find this ;-)) 


I would be very appreciated if it could be included
into the osg core. I would also be very happy if the
Texture2DArray submission would also be included into
the core. More Sh4.0 patches will follow soon.


Best regards, Art



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