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Cannot render transparent background in IE or Safari #88

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brianchirls opened this issue Apr 22, 2015 · 0 comments
Closed

Cannot render transparent background in IE or Safari #88

brianchirls opened this issue Apr 22, 2015 · 0 comments
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Summer 2015

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As seen at http://www.martialarts-wien.at/

This appears to be because Safari and IE11 are ignoring the premultipliedAlpha option, as demonstrated here.
@brianchirls brianchirls self-assigned this Apr 22, 2015
brianchirls added a commit that referenced this issue Apr 22, 2015
@brianchirls
Change canvas output to premultiplied alpha (#88)
95e4eec 
A workaround for broken/missing support for the `premultipliedAlpha` WebGL context option in Safari and Internet Explorer. This is not ideal, because it changes the output values of `readPixels` on WebGL target nodes. But it appears to be the only way to make transparent backgrounds work in all browsers.

According to the WebGL spec, support for the option is mandatory, so there is no way to feature-detect whether it's working in a given browser. So the workaround needs to apply everywhere.
@brianchirls brianchirls added this to the Early Summer 2015 milestone May 12, 2015
@brianchirls brianchirls mentioned this issue Jun 16, 2015
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@brianchirls brianchirls mentioned this issue Sep 5, 2015
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