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The context was getting cleaned too often maybe.
This fix reverts one line from commit
https://gitlab.kitware.com/vtk/vtk/commit/
3a8e4497

This commit fixes issue

vtk/vtk#16876

and adds a test for that condition as well as
a few other cases that should work but could
cause problems.

This change could introduce other issues limited
to windows as the code is fairly complex and
the use cases vary widely. At some point the whole
process of creating windows and handling offscreen
drawing needs to be reworked. It is a mishmash of 20
years of code and overdue for a real workover for all
platforms. But this topic is intended to fix this one
case until we have time to really look at it and rework
it.

Currently the new test is only active for OpenGL2 and
Windows. OpenGL1 and other platforms has issues with
it that need to be fixed in the future. But for now this
change fixes the reported Windows issues and adds a
test to maintain that fix.

Fix some long standing issues with multisamples
and stereo capable window requests on Win32.

The context was getting cleaned too often maybe.
This fix reverts one line from commit
https://gitlab.kitware.com/vtk/vtk/commit/
3a8e4497

This commit fixes issue

vtk/vtk#16876

and adds a test for that condition as well as
a few other cases that should work but could
cause problems.

This change could introduce other issues limited
to windows as the code is fairly complex and
the use cases vary widely. At some point the whole
process of creating windows and handling offscreen
drawing needs to be reworked. It is a mishmash of 20
years of code and overdue for a real workover for all
platforms. But this topic is intended to fix this one
case until we have time to really look at it and rework
it.

Currently the new test is only active for OpenGL2 and
Windows. OpenGL1 and other platforms has issues with
it that need to be fixed in the future. But for now this
change fixes the reported Windows issues and adds a
test to maintain that fix.

Fix some long standing issues with multisamples
and stereo capable window requests on Win32.

The old code would reduce the number of samples
requested but never disable it. This topic makes it
so that after reducing the number, if will if needed
try disabling MSAA altogether.

This commit reindents the code with the following utility:
Utilities/Maintenance/vtk-reindent-code.py

This utility changes the positions of the braces so that they are no
longer indented relative to the code block they reside in.

The bash command line used was the following:

for d in Charts Common Deprecated Domains Examples Filters GUISupport \
         Geovis IO Imaging Infovis Interaction Parallel Rendering \
         Testing Views Web Wrapping; do
  for e in cxx cxx.in txx txx.in hxx hxx.in h h.in c c.in; do
    find "${d}" -name "*.${e}" -exec \
      python Utilities/Maintenance/vtk_reindent_code.py {} +
  done
done

new approach to ReleaseGraphicsResources where objects
that use opengl resources can register themselves
with their current window/context so that when either they
delete or the context is deleted the resources will be
cleared correctly.

Cell normals should work now on systems that lack floating
point texture support. Previously normal values less than zero
would be clamped to zero.

Code extracted from:

    https://gitlab.kitware.com/third-party/proj.git

at commit 41bdf05361007f8c5186f3df9944d86bb273ed13 (for/vtk).

Since the 2000 and 3000 are the same basic
arch test for both of them

on some systems 3.1 or 3.0 might work while 2.1 does not

rendering to a memory HDC is not support beyond opengl 1.4
so change the print methods to use FBOs

These calls should not be needed but pollute the code
and the profiling results and potentially slow down execution

add a GetOpenGLVersion method to OpenGLRenderWindow

modify Win32OpenGLRenderWindow to try to get a
more recent context than 3.2 if available.

Find/replace of:

with C++ counterparts.  Changed only vtk*.cxx files.
Didn’t touch .h or .c or any 3rd party.

This function used to presume a window style used to compute the whole window
size needed for a requested client frame size. The obtained client size of the
window what finally not the one requested - thus the frame buffer was not of
the size obtained by calling GetSize(), leading to problem when capturing
image from the back buffer for instance.

The current window style is now directly obtained using the related Win32 API
function with the window hanle, ensuring a correct window rect computation.

This new function switch to hardware off-screen rendering mode
with the current (on-screen) OpenGL context.
This allows to render on this buffer to perform a rendering pass
even if the window is hidden for instance.

when testing for ogl support capture warning and error
output messages

Do the x window type check on windows as well

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

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

Update Windows checks for OpenGL2

when registering the window class.

Conflicts:
	Rendering/OpenGL2/vtkWin32OpenGLRenderWindow.cxx

We no longer need this compatibility layer for the compilers we support.
Use the following commands to switch to standard header and namespace:

 git grep -l vtksys/ios/ | xargs sed -i 's|vtksys/ios/||'
 git grep -l vtksys_ios | xargs sed -i 's|vtksys_ios|std|g'

MSVC2015 warns about narrowing.

Conflicts:
	Common/Core/Testing/Python/TestEmptyInput.py
	IO/Import/vtkOBJImporter.cxx
	IO/Import/vtkOBJImporterInternals.cxx
	Rendering/Core/vtkLabeledContourMapper.cxx
	Rendering/External/vtkExternalOpenGLRenderer.cxx
	Rendering/External/vtkExternalOpenGLRenderer.h
	Rendering/OpenGL2/vtkGenericOpenGLRenderWindow.cxx
	Rendering/OpenGL2/vtkGenericOpenGLRenderWindow.h
	Rendering/Volume/Testing/Cxx/CMakeLists.txt

In the early days of VTK, support for stl was not portable. vtksys_stl
and vtksys_ios provided a portable implementation of the stl. Now, all
of the VTK supported compilers have portable stl implementations.

This patch:
  1) Replaces the vtksys_ios:: with std::.
  2) Replaces the vtksys_stl:: with std::.
  3) Removes "using" statements for stl

The LIC shaders were not converted properly for gl 3.2

Cleanup some code standard issues

Auto-detecting the screen DPI (which the win32 backend does)
interferes with testing after we make 2D text rendering
DPI-aware. Since only one backend supported automatic DPI
detection, I moved this out into a user method so that folks
who depend on this behavior can still have it, but we can
test consistently.