The word surface is more often used for something like a polygonal mesh,
so this name is quite confusing. Canvas is consistent with a
conventional name in GUI widget APIs.
The rendering classes do not actually manage windows, and window was not
descriptive of what this class was doing. We decided that the class was
mostly analogous to what we call a "view" in ParaView.
Specifically, I am trying to compile the code on OSX. OSX uses OpenGL
libraries in a different directory than most other installs (including
X11) and does not generally support GLX. These changes remove the files
that support GLX in systems that do not support it.
I also added several header files to the CMake lists that were not there
but should have been.
Several of the methods in View.h were giving me warnings about shadowed
variables because the name of the arguments were the same as some class
member variables. I fixed this by changing the variable names to match
the VTK-m coding convention of using capitalized words for class member
variables and starting lower case letter for method arguments and local
variables.
Since this ended up changing over half of the lines of View.h and
Camera.h anyway, I also made some other modifications to the style to put
it in alignment with VTK-m coding conventions including 2-space
indentation and more descriptive variable names.
