+ The shape function must have a function space named "constant".
+ Also, the "point" array-group is renamed "points" to match the
  group name for the point coordinates so that HGRAD values are
  shown in the array editor.
+ Finally, the centers of all sides (not just the edges) are
  glyphed when rendering glyphs to better illustrate the vector fields
  in the CellGridSource application.
+ Make Ctrl+Q a shortcut to quit the example CellGridSource app.

Kitware Robot authored 5 months ago and Ben Boeckel committed 5 months ago

Also use C++17 syntax rules as the next release expects to use C++17.

- this commit renames CanvasId to CanvasSelector
  and forwards it to emscripten calls.
- made it so users can invoke `ProcessEvents` on the wasm
  interactor directly without calling `Start`. This is needed
  because the only way for users to process events on multiple
  wasm interactors is to call `emscripten_set_main_loop` with
  a lambda that invokes `ProcessEvents` on all interactors.
- removed the `canvas` key in the wasm module from
  examples and unit test html files.
- clean up wasm examples because the Module.canvas property is not required.
- simplify cmake setup in wasm examples

+ Add vtkCellGridCellCenters filter to compute cell centers as vertex cells.
+ Add vtkCellGridCellSource algorithm to create a single cell of the specified type.
+ Add an example application "CellGridSource" that demonstrates how cell-grid
  data is structured in memory and allows people to edit coefficients to explore
  function spaces.
+ Provide CPU interpolation that uses the same basis functions as GPU interpolation.
+ Add a legacy VTK reader+writer for vtkCellGrid so that ParaView client-server
  rendering works for small data (which must be transferred to the client).
+ Replace Intrepid basis functions with Intrepid2 basis functions.
+ Add a vtkCellGridToUnstructuredGrid filter; the output will always have linear
  geometry even if the source uses quadratic or higher order interpolation.
+ Add an HDIV attribute to the `dgHexahedra.dg` sample data.
+ Make the vtkPassSelectedArrays filter accept and process vtkCellGrid instances.
+ Add vtkCellGridTransform filter to apply a (linear) transform to a cell-grid's
  shape attribute.
+ Add vtkCellGridWarp filter to add an HGRAD cell-attribute to a cell-grid's
  shape attribute.
+ Add `vtkCellGridAlgorithm::GetInputCellAttributeToProcess()` to mirror
  `vtkAlgorithm::GetInputAbstractArrayToProcess()` (but for cell-grids); and
  `vtkCellGridAlgorithm::SetInputAttributeToProcess()` to mirror
  `vtkAlgorithm::SetInputArrayToProcess()`.
  Note that cell-attributes may currently only be referenced by name.
  Eventually, we should allow them to be referenced not by "type" (i.e.,
  field association) but by vtkCellAttribute::GetSpace().
+ Add attribute range information to cell-grid reader/writer.
+ When copying cell-grid instances, copy cached cell-grid range information in
  some cases.
+ Support range computation for HDIV and HCURL function spaces.
+ Add a vtkIOSSCellGridReader class that reads exodus files that end with a
  `.exdg` suffix as cell-grids instead of unstructured-grids.
  This also ports Spiros's performance changes to the new reader:
  changes from 9e3af159 through
  c0eca941 are included.
  Nodsets are not supported yet.
+ Add an option to the vtkCellGridReader/Writer classes to load/save
  JSON as binary message-pack data instead of plain-text.

Vincent Le Garrec authored 8 months ago and Lucas Givord committed 6 months ago

(cherry picked from commit 47c85475)

- This example adds on the AsyncClipper example by demonstrating how one
 might use embind and web workers.
- The main difference is that with embind, there is no `main(int, char**)`
 function and the entire application is driven from javascript.
- This example shows in detail how to create a pthread and transfer the
 canvas offscreen so that the new web worker can render into it. In the
 `AsyncClipper`, we used `-sPROXY_TO_PTHREAD` link flag which did all the
 tasks necessary to run our `main(int, char**)` on a new web worker.

- This example has a simple `main` function which sets up the VTK
  pipeline using vtkTableBasedClipDataSet.
- It shows how one might leverage the vtkAlgorithm abort functionality
  because now all the VTK rendering and processing is offloaded into a
  web worker leaving the main thread free to go and set the abort flag.
- In this example, the abort flag is set whenever user mouses
  down and moves the cursor on the canvas. As soon as the mouse is
  released, the abort flag is reset.

Add a new vtkGenerateIds filter that correspond to the former vtkIdFilters
with HTG support. Deprecate vtkIdFilters since we need to change inheritance.

Updating a lot of baselines to match the new image comparison method

- in favor of vtkWebAssemblyRenderWindowInteractor

Consequently, added some previously ignored files to the repo.

It seems .mm, .pch, and .xcconfig files were missed by whatever added these special comments.

Replace 1

cat files.out |  xargs -I %s perl -i~ -0777 -pe 's/\/\*=========================================================================(.|\n)*.*Program:   Visualization Toolkit\n.*Module:.*\n\n  Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n  All rights reserved.\n  See Copyright.txt or .* for details.\n\n.*\n.*\n.*\n.*\*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-License-Identifier: BSD-3-CLAUSE/g' %s

Replace 2

cat files.out |  xargs -I %s perl -i~ -0777 -pe 's/\/\*=========================================================================(.|\n)*.*Program:   Visualization Toolkit\n.*Module:.*\n\n  Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n  All rights reserved.\n  See Copyright.txt or .* for details.\n\n.*\n.*\n.*\n\n.*\*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-License-Identifier: BSD-3-CLAUSE/g' %s

Replace 3

cat files.out |  xargs -I %s perl -i~ -0777 -pe 's/\/\*=========================================================================\n.*Program:.*Visualization Toolkit\n.*Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n.*All rights reserved.\n.*See Copyright.txt or .* for details.\n.*\n.*\n.*\n.*\*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-License-Identifier: BSD-3-CLAUSE/g' %s

Replace 4

cat files.out |  xargs -I %s perl -i~ -0777 -pe 's/\/\*=========================================================================\n\n.*Program:.*Visualization Toolkit\n\n.*Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n.*All rights reserved.\n.*See Copyright.txt or .* for details.\n\n.*\n.*\n.*\n\n=========================================================================\*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-License-Identifier: BSD-3-CLAUSE/g' %s

Replace 5

cat files.out |  xargs -I %s perl -i~ -0777 -pe 's/\/\*=========================================================================\n\n.*Program:.*Visualization Toolkit\n.*Module:.*\n\n.*Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n.*All rights reserved.\n.*See Copyright.txt or .* for details.\n\n.*\n.*\n.*\n\n=========================================================================\*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-License-Identifier: BSD-3-CLAUSE/g' %s

Replace 6

cat files.out |  xargs -I %s perl -i~ -0777 -pe 's/\/\*=========================================================================\n\n.*Program:.*Visualization Toolkit\n.*Module:.*\n\n.*Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n.*All rights reserved.\n.*See Copyright.txt or .* for details.\n\n.*\n.*\n.*\n\n.*=========================================================================\*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-License-Identifier: BSD-3-CLAUSE/g' %s

Replace 7

cat files.out |  xargs -I %s perl -i~ -0777 -pe 's/\/\*=========================================================================\n\n.*Program:.*Visualization Toolkit\n.*Module:.*\n\n.*Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n.*All rights reserved.\n\n.*See Copyright.txt or .* for details.\n\n.*\n.*\n.*\n\n=========================================================================\*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-License-Identifier: BSD-3-CLAUSE/g' %s

Replace 8

cat files.out |  xargs -I %s perl -i~ -0777 -pe 's/\/\*==================================================================\n\n.*Program:.*Visualization Toolkit\n.*Module:.*\n\n.*Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n.*All rights reserved.\n.*See Copyright.txt or .* for details.\n\n.*\n.*\n.*\n\n===================================================================\*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-License-Identifier: BSD-3-CLAUSE/g' %s

Replace sandia 1

 cat files.out | xargs -I %s perl -i~ -0777 -pe 's/\/\*=========================================================================\n\n.*Program:.*Visualization Toolkit\n.*Module:.*\n\n-------------------------------------------------------------------------\n.*Copyright 2008 Sandia Corporation.\n.*Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,\n.*the U.S. Government retains certain rights in this software.\n-------------------------------------------------------------------------\n\n.*Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n.*All rights reserved.\n.*See Copyright.txt or .* for details.\n\n.*\n.*\n.*\n\n=========================================================================\*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-FileCopyrightText: Copyright 2008 Sandia Corporation\n\/\/ SPDX-License-Identifier: LicenseRef-BSD-3-CLAUSE-Sandia-USGov/g' %s

Replace 9

cat files.out | xargs -I %s perl -i~ -0777 -pe 's/\/\*=========================================================================\n\n.*Program:.*Visualization Toolkit\n.*Module:.*\n.*Language:.*\n\n.*Copyright \(c\) .* Ken Martin, Will Schroeder, Bill Lorensen\n.*All rights reserved.\n.*See Copyright.txt or .* for details.\n\n.*\n.*\n.*\n\n=========================================================================\*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-License-Identifier: BSD-3-CLAUSE/g' %s

Manual 1

Replace 10

cat files.out | xargs -I %s perl -i~ -0777 -pe 's/\/\*=========================================================================\n\n.*Program:.*\n.*Module:.*\n\n.*Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n.*All rights reserved.\n.*See Copyright.txt or .* for details.\n\n.*\n.*\n.*\n\n=========================================================================\*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-License-Identifier: BSD-3-CLAUSE/g' %s

Replace 11

cat files.out | xargs -I %s perl -i~ -0777 -pe 's/\/\*=========================================================================\n.*Program:.*\n.*Module:.*\n.*Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n.*All rights reserved.\n.*See Copyright.txt or .* for details.\n.*\n.*\n.*\n=========================================================================\*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-License-Identifier: BSD-3-CLAUSE/g' %s

Replace Valve 1

cat files.out | xargs -I %s perl -i~ -0777 -pe 's/\/\*=========================================================================\n\n.*Program:.*\n.*Module:.*\n\n.*Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n.*All rights reserved.\n.*See Copyright.txt or .* for details.\n\n.*\n.*\n.*\n\nParts Copyright Valve Corporation from.*\nunder their BSD license found here:\n.*\n\n=========================================================================\*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-FileCopyrightText: Copyright (c) 2015, Valve Corporation\n\/\/ SPDX-License-Identifier: BSD-3-CLAUSE/g' %s

Manual 2

Manual 3

manual 4

manual sandia 1

manual 5

Replace ParaView 1

cat files.out | xargs -I %s perl -i~ -0777 -pe 's/\/\*=========================================================================\n\n.*Program:.*\n.*Module:.*\n\n.*Copyright \(c\) Sandia Corporation, Kitware Inc.\n.*All rights reserved.\n.*See Copyright.txt or .* for details.\n\n.*\n.*\n.*\n\n=========================================================================\*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-FileCopyrightText: Copyright (c) Sandia Corporation, Kitware Inc\n\/\/ SPDX-License-Identifier: BSD-3-CLAUSE/g' %s

Manual Sandia 2

Replace 13

cat files.out | xargs -I %s perl -i~ -0777 -pe 's/\/\*=========================================================================\n\n.*Program:.*\n\n.*Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n.*All rights reserved.\n.*See Copyright.txt or .* for details.\n\n.*\n.*\n.*\n\n.*=========================================================================\*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-License-Identifier: BSD-3-CLAUSE/g' %s

Manual sandia 3

replace 14

cat files.out | xargs -I %s perl -i~ -0777 -pe 's/\/\*=========================================================================\n\n.*Program:.*\n.*Module:.*\n.*Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n.*All rights reserved.\n.*See Copyright.txt or .* for details.\n\n.*\n.*\n.*\n\n.*=========================================================================\*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-License-Identifier: BSD-3-CLAUSE/g' %s

Manual sandia 4

Manual 6

manual 7

manual sandia 5

Manual Kitware SAS 1

manual 7

Manual 10

manual 11

manual 12

manual 15

Fix wrong spdx name

Remove useless cmake copyright

Remove useless copyrights

Remove useless copyright and license statement in python files

Removal glsl

cat files.out | xargs -I %s perl -i~ -0777 -pe "s/.*=========================================================================\n.*\n.*Program:.*\n.*Module:.*\n.*\n.*Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n.*All rights reserved.\n.*See Copyright.txt or .*for details.\n.*\n.*\n.*\n.*\n.*\n.*=========================================================================\n//g" %s

Replace sandia accel

cat files.out | xargs -I %s perl -i~ -0777 -pe 's/\/\/=============================================================================\n.*\n.*Copyright \(c\) Kitware, Inc.\n.*All rights reserved.\n.*See LICENSE.txt for details.\n.*\n.*This.*\n.*the.*\n.*PURPOSE.*\n.*\n.*Copyright 2012 Sandia Corporation.\n.*Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,\n.*the U.S. Government retains certain rights in this software.\n.*\n.*=============================================================================/\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-FileCopyrightText: Copyright (c) Kitware, Inc.\n\/\/ SPDX-FileCopyrightText: Copyright 2012 Sandia Corporation.\n\/\/ SPDX-License-Identifier: LicenseRef-BSD-3-Clause-Sandia-USGov/g' %s

Manual sandia accel

manual Kitware inc

Manual fixups

Manual 14

Replace 15

cat files.out | xargs -I %s perl -i~ -0777 -pe 's/\/\*=========================================================================\n\n.*Program:.*\n.*Module:.*\n\n.*Copyright \(c\) Kitware, Inc.\n.*All rights reserved.\n.*See LICENSE file for details.\n\n.*\n.*\n.*\n\n=========================================================================\*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-License-Identifier: BSD-3-CLAUSE/g' %s

Manual 16

Removing non-standard file header

cat files.out | xargs -I %s perl -i~ -0777 -pe 's/\/\/ \-\*\- c\+\+.*\n\n//g' %s

Manual removal non standard header

Adding custom sandia and lanl licenses

Fix missing header common core

Manual missing headers

Add missing sandia

cat files.out  | xargs -I %s perl -i~ -0777 -pe 's/\A\/\/ SPDX-FileCopyrightText.*\n\/\/ SPDX-License-Identifier.*\n\n\/\*\n.*Copyright 2004 Sandia Corporation.\n.*Under.*\n.*license.*\n.*U.*\n.*or.*\n.*statement.*\n \*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-FileCopyrightText: Copyright 2004 Sandia Corporation\n\/\/ SPDX-License-Identifier: LicenseRef-BSD-3-Clause-Sandia-USGov/g' %s

Adding missing sandia licenses

Adding sandia licenses

Adding missing sandia licenses

Replace sandia

Adding sandia module changes

Use new custom license system

Replace sandia

cat files.out  | xargs -I %s perl -i~ -0777 -pe 's/\A\/\/ SPDX-FileCopyrightText.*\n\/\/ SPDX-License-Identifier.*\n\/\*-------------------------------------------------------------------------\n.*Copyright 2009 Sandia Corporation.\n.*Under the terms of Contract DE-AC04-94AL85000.*\n.*the.*\n-------------------------------------------------------------------------\*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-FileCopyrightText: Copyright 2009 Sandia Corporation\n\/\/ SPDX-License-Identifier: LicenseRef-BSD-3-Clause-Sandia-USGov/g' %s

Adding missing sandia licenses

Sandia final fixup license

Adding missing sandia license

Fix remaining sandia license

Manual LANL license

Replace sandia BSD

cat files.out  | xargs -I %s perl -i~ -0777 -pe 's/\A\/\/ SPDX-FileCopyrightText.*\n\/\/ SPDX-License-Identifier.*\n\/\*----------------------------------------------------------------------------\n.*Copyright \(c\) Sandia Corporation\n.*See Copyright.txt.*\n.*----------------------------------------------------------------------------\*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-FileCopyrightText: Copyright \(c\) Sandia Corporation\n\/\/ SPDX-License-Identifier: BSD-3-Clause/g' %s

Replace Kitware, Inc.

 cat files.out  | xargs -I %s perl -i~ -0777 -pe 's/\A\/\*=========================================================================\n\n.*Program.*\n.*Module.*\n\n.*Copyright \(c\) Kitware, Inc.\n.*All rights reserved.\n.*See Copyright.txt.*\n\n.*This.*\n.*the.*\n.*PURPOSE.*\n\n=========================================================================\*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-FileCopyrightText: Copyright \(c\) Kitware, Inc.\n\/\/ SPDX-License-Identifier: BSD-3-Clause/g' %s

Manual ParaView license

Remove useless license statement in cmake files

Manual licenses

Replace lanl

 cat files.out  | xargs -I %s perl -i~ -0777 -pe 's/\A\/\/ SPDX-FileCopyrightText.*\n\/\/ SPDX-License-Identifier.*\n\n\/\*.*\n.*\n.*Copyright \(c\) 2000.*2009.*Lawrence Livermore National Security, LLC\n.*Produced at the Lawrence.*\n.*LLNL-CODE-400124\n.*All rights reserved.\n.*\n.*This.*\n.*see.*\n.*file.*\n.*http.*\n.*\n.*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-FileCopyrightText: Copyright \(c\) 2000 - 2009, Lawrence Livermore National Security, LLC\n\/\/ SPDX-License-Identifier: BSD-3-Clause/g' %s

Manual LANL

NVIDIA license impact

Manual Indiana

Manual copyrights

More manual licenses

More manual licenses

Replace Atamai

 cat a.out  | xargs -I %s perl -i~ -0777 -pe 's/\A\/\/ SPDX-FileCopyrightText.*\n\/\/ SPDX-License-Identifier.*\n\/\*.*\n\n.*Copyright \(c\) 2006 Atamai, Inc.\n\nUse.*\nbinary.*\nconditions.*\n\n1.*\n   form.*\n   the.*\n   license.*\n\n2.*\n   notice.*\n   in.*\n   distribution.*\n\n3.*\n   and.*\n\nTHE.*\nWITHOUT.*\nTHE.*\nPURPOSE.*\nMODIFY.*\nBE.*\n.*\nOR.*\nTHE.*\nPOSSIBILITY.*\n\n.*\*\//\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-FileCopyrightText: Copyright \(c\) 2006 Atamai, Inc.\n\/\/ SPDX-License-Identifier: BSD-3-Clause/g' %s

Manual MIT

Manual licenses

Xdmf2 License

PLY license

Manual VRML licenses

replace Netcdf license

Manual OpenXR license

Manual Licenses

Example Licenses manual

Manual Copyrights and licenses

Manual licensing

Removing empty lines

Manual licenses

Manual final pass

Manual Dicom

Replace all cxx without copyright info

find .  -name "*.cxx" -exec grep -L "SPDX" {} \; | grep -v ThirdParty | grep -v Utilities > files.out

cat files.out |  xargs -I %s perl -i~ -0777 -pe 's/\A(.*)\n/\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-License-Identifier: BSD-3-Clause\n$1\n/g' %s

Replace all header missing license

find .  -name "*\.h" -exec grep -L "SPDX" {} \; | grep -v ThirdParty | grep -v Utilities > files.out

cat files.out |  xargs -I %s perl -i~ -0777 -pe 's/\A(.*)\n/\/\/ SPDX-FileCopyrightText: Copyright \(c\) Ken Martin, Will Schroeder, Bill Lorensen\n\/\/ SPDX-License-Identifier: BSD-3-Clause\n$1\n/g' %s

Manual from build

Add missing license

Replace copyright.txt

Remove license files

Manual fixes found by building

Fix header testing

Add license in vtkEncodeString

Manual new filters

Review JF

Co-authored-by: Jean-Christophe Fillion-Robin <jchris.fillionr@kitware.com>

- Adds missing RenderingOpenGL2 component.
- Earlier, RenderingVtkJS optionally depended on RenderingOpenGL2 and the IOExport component depended on RenderingVtkJS, so everything just worked.

There's no reason to search for both; only one will work anyways.

VTK CMake uses 2-space indentation.

This makes it easier to support Qt5 and Qt6 at the same time.

- this example demonstrates how to use single C++ code base and a single
wasm binary to serve applications using both OpenGL and WebGPU backends.

- preparing to add a multi-backend example.

- resize window in `onRuntimeInitialized` handler
- place keys in single-quotes so that closure compiler works
- this example doesn't expose bindings so no need to call exported function to create an instance.

- SDL2 render window and interactor are the default object factory overrides in VTK-wasm

- DEBUGINFO controls function readability in browser dev tools.
- OPTIMIZE controls bytecode size and js minification.
- Modularize and export only when C++ gets wrapped.