[rviz_rendering] add glsl resources and test with / fix glsl 150

[wjwwood]

See:

rviz/rviz_rendering/src/rviz_rendering/render_system.cpp

Line 314 in ca8f42e

// TODO(wjwwood): figure out why includes don't work on 150

[Martin-Idel-SI]

Maybe we can try to help, but could you maybe clarify the issue? On my Ubuntu with NVidia graphics card, I get OpenGL 4.5 and thus glsl >150 and there seems to be no issue. Resources seem to get added and I have no error or warning. What exactly is supposed to happen or not happen? Thank you.

[wjwwood]

@Martin-Idel-SI Sure, sorry for not having more details in the original issue. I was getting issues specifically with the // include in the glsl scripts, because ogre would parse the comment, then try to find the resource using the Ogre::ResourceManager thing and that was failing.

Here's an example of one of the include comments:

https://github.com/ros2/rviz/blob/ros2/rviz/ogre_media/materials/glsl120/glsl120.program#L2-L5

I'd have to move that folder to rviz_rendering again and try to reenable the loading of those to see the issue again. I can try to setup a branch with that on it for you tonight.