Texture2DArray fails to regenerate after a releaseGLObjects/dirtyTextureObject (possible solution)

[gwaldron]

If you use a Texture2DArray, and call releaseGLObjects() on it (which calls dirtyTextureObject), the texture fails to recompile properly from that point forward.

I believe the problem is here: https://github.com/openscenegraph/OpenSceneGraph/blob/master/src/osg/Texture2DArray.cpp#L403

When it allocates a new texture object, it checks the component images' modification flags before subloading. This prevents the subload from running unless the user manually calls image->dirty() on each component image. (Note, Texture2D and Texture3D do not check the modified count -- they skip this test in the same situation.)

Let me know if you agree and I can submit a PR. Thanks. (master branch)

[robertosfield]

A quick look at the code and I think this branch is only ever called when a textureObject is null so it wouldn't make sense to check the dirty count as the the data needs subheading no matter what, so I think removing the check is the correct thing to do.