Post processing using webgl

[bezzee]

• I have tried with the newest version of editly: npm i -g editly or npm i editly@latest
• I have tried ffmpeg newest stable version
• I have searched for existing issues

Firstly thanks for this wonderful app. I'm new to JS and learnt a lot of things thru editly and TBH it's overwhelming.

My requirement is to use image filters of canvas some of which are written in glsl. I looked into videoframesource.js where the filters can be applied, but since the canvas used in editly is 2D context, how do I convert the canvas to webgl and do the post processing, convert it back to 2d before returning the frame?

I checked glframesource where the shader is run directly, but I prefer to use the filters workflow of canvas to do the job.

Thanks

[bkeepers]

@bezzee does #222 solve this for you? It is included in the latest release.