Consider to change preserveDrawingBuffer to false for webgl context

[georgwaechter]

Consider to change preserveDrawingBuffer to false for webgl context

[MatthewShotton]

Hi Georg,

As part of a change to support passing in options to the VideoContext's constructor I've added a way to pass in custom context attributes to the underlying WebGL context. It can be used like the following:

var videoContextOptions = {webglContextAttributes: {preserveDrawingBuffer: true, alpha: false}};
var videoContext = new VideoContext(canvas, undefined, videoContextOptions);

The default context attributes for the webGL context are:

 {preserveDrawingBuffer: true, alpha: false}

Changing things away from the default should be considered undefined behaviour for now. But it should give you the functionality required to experiment to find optimal parameters for mobile.

Feel free to re-open this issue if this doesn't provide the required functionality.

EDIT: This is now available on NPM as version 0.19.0.

Kind regards,
Matt

[MatthewShotton]

Hmm, on second thoughts I'll reopen this issue as a reminder that we might want to change the default setting for preserveDrawingBuffer once performance/functionality test have taken place.

Kind regards,
Matt