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wasm-opengl: replace SDL2 with emscripten webgl API

Jaswant Panchumarti (Kitware) requested to merge jaswant.panchumarti/vtk:use-emscripten-html-webgl-header into master

Refactors the webassembly opengl render window to use emscripten's html5.h and html_webgl.h. It now calls into emscripten_* APIs to create a GL context, resize window, swap buffers and so on.

This works in

  • wasm32
  • wasm64
  • wasm32+pthread proxying
  • wasm64+pthread proxying
Edited by Jaswant Panchumarti (Kitware)

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