[osg-submissions] Frag data location binding patch

[Art Tevs]

Hi folks,

I attached a new (small) patch to support the new glBindFragDataLocationEXT and glGetFragDataLocationEXT functions. 

The function were introduced with the Shader Model 4.0 hardware. More info can be found in EXT_gpu_shader4

File Changes:
 - GL2Extensions, Program and Program.cpp

Features:
- Support for fragment output binding. (e.g. You can now specify in the fragment shader varying out vec3 fragOut; fragOut = vec3(1,0,1); to write to the fragOut variable. In your program you call glBindFragDataLocation(program, 1, "fragOut") to bind the fragOut variable with the MRT 1 - GL_COLOR_ATTACHMENT1_EXT)

- new methods Program::add/removeBindFragDataLocation Program::getFragDataBindingList 


ToDo:
- more hard tests are required, since the glBindFragDataLocation seems to be pretty stable or there is a problem in my app ;-)
- Probalby we can also provide something like active frag data bindings (like it is done for the vertex attribute binding) ?

Best regards,

Art


       
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