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This tool warns where macros should be using parens.
Fixed many issues it pointed out by either:
 - adding parens (which it can do automatically)
 - removed unused (or rarely used) macros
 - replacing macros with functions, notably vtkMath stuff

when testing for ogl support capture warning and error
output messages

Do the x window type check on windows as well

Cache the result provide an API for a string message
Verify that a shader program compiles

try creating a new window and destroying it

Avoid creating visuals, use correct args for pbuffer
try to leave state unmodified after the call

it was always trying to free the display

clean up the display connection if we test of ogl support

Working with Brian Paul to get a 3.2 osmesa context
requires changes to VTK and 11.2 mesa changes to work

Fixes vtkTextureObject::CopyToFrameBuffer() to discard source fragments
with alpha <= 0.

In some cases the backend may be defined by the cmakelists file
so only define it if it is not already defined

Switch to const char * which has more flexibility as backends
do not all have to be defined in VTK proper but can be
subclassed

Put the beckend enum into the RenderWindow class

After reading the spec carefully realized that
we don't need to treat texture type as basis
for texture dimension. Also added note clarification
on what does size means.

Add a configured value in vtkRenderingOpenGLConfigure
for external applications to use and provide a new
method in vtkRenderWindow to get the backend at
runtime.

Forgot to remove some debug code I was
using to test something

In ParaView, we have to supply the ui with pwf instances for the
opacity and size mapping.  The default pwf range is [0,0] to [1,1].
If you choose to size by an array with a range much larger than this,
ParaView crashes.  You can get around it by first open the pwf
editor and adjusting the x range to match an array you would like
to work with.

This fix could cause the mapper to be too slow, so I would like to
solicit other, more efficient approaches.

Fix edge flag being set and declared twice

This topic should make it so that the VBO and IBO only gets
rebuilt when it really needs to. Instead of relying on high
level MTimes it actually looks at the pieces of data that impact
the VBO or IBO respectively. The VBO can build without the IBO
rebuilding and vice versa.

The vtkOpenGLPolyDataMapper2D may update the VBO many times,
invoking the warning about the Apple bug many times. Warn
once instead.

This fix is in reference to issue #15753. Originally, when coloring by
scalars was not enabled, the resultant glyphs were always white. Now, the
glyph color is obtained from the associated vtkActor.

Need a drawable to make current use a pbuffer on glx

Also improve the error message when it fails.

Added code to handle when a Stereo window can not
be obtained. fixed the code to check for failing
to get a pixel format.

Add in the support for checking for OPenGL on X

An issue with OS windows lead to this. But it needs to done
and it will not be working in the commit.

No clue how the previous code had a chance of working
New code should check for what we need.

Update Windows checks for OpenGL2

This allows proper mouse and keyboard interaction in
cases where VTK is not running within a .app bundle,
which is the case for several samples out there.

Some systems have a lag when resizing a window and fail
this test. So remove the resizing as resizing is not the
point of the test

Some systems do not have multisampling

Add in mapper specific offsets for resolving coincident
geometry