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I removed this check in #1020 because it produced a warning on Firefox. Better a warning than an OpenGL error though.
The browser will only allow the first thing we check, so this will prevent webgl2 from working.
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Closes #1087
Two major bugs!
The first introduced in #888:
We would always get the WebGL1 context from the canvas first, before trying WebGL2. This made later attempts to get the webgl2 context failed (since we already told the browser we were interested in WebGL1).
The second introduced in #1020:
We used to check
WEBGL_debug_renderer_infobefore callinggl.get_parameter(web_sys::WebglDebugRendererInfo::UNMASKED_RENDERER_WEBGL). I removed that check in #1020, making theget_parameterfail with an OpenGL error, which lead to later asserts failing.I've since down-graded these asserts to log instead of crashing.