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[Alessandro Pignotti <1273394@xxxxxxxxxxxxxxxxxx>]

Please try again with the updated instructions on the examples page.
Unfortuntely the page was outdated.

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https://bugs.launchpad.net/bugs/1273394

Title:
  Can not compile "A simple WebGL example"

Status in Duetto: C++ for the Web:
  New

Bug description:
  Tried to run the A Simple WebGl example from this page
  http://www.leaningtech.com/duetto/examples/ and failed to compile. By
  simply compy-paste the code compiler reports that client::Document is
  not a pointer; maybe you meant to use '.'? Next, after changing the
  code to use document. instead document-> compiler complained that
  HTMLCanvasElement does not refer to a value. I am not good with C++
  but to me it looks like the author wants to cast HTMLElement to
  HTMLCanvasElement. So, after rewriting

  auto canvas = document->getElementById
                <HTMLCanvasElement>("glcanvas"); 

  to

  auto canvas =
  static_cast<HTMLCanvasElement*>(document.getElementById("glcanvas"));

  I didn't receive this message again. Next, compiler complained with
  WebGLRenderingContext  does  not refer  to a value so I rewrite this
  line of code

  auto gl = canvas->getContext
                <WebGLRenderingContext>("experimental-webgl");

  to

  auto gl = static_cast<WebGLRenderingContext*>(canvas->getContext
  ("experimental-webgl"));

  but than he complained that he can not cast CanvasRenderingContext2D
  to WebGLRenderingContext which is clear because canvas->getContext
  returns type CanvasRenderingContext2D

  Can you help me with this?

  Thank you

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