[REQUEST][v5] Add progressive texture upload

[m9dfukc]

Targets:
Pixi.js v5
WegGl 2
Firefox >= 42, Chrome >= 50, Opera >= 39

Problem description:
Certain applications - VR for example (I know, not really the target audience of pixi.js) - require realtime assets loading without dropping frames. Therefore we need a way to decode and upload images in a non blocking manner.

Proposal:
With createImageBitmap we already got a async method of decoding an image in the two major browsers. The pixi.js support for ImageBitmap is already in the pipeline for v5 although still not properly implemented. The second part of this would be the progressive texture upload which is currently done using one pass with texImage2D. For larger images this could be done using texSubImage2D uploading the texture over serval frames or via requestIdleCallback.

Related:

• http://www.html5gamedevs.com/topic/34997-progressive-texture-upload/
• Non-blocking assets loaders mrdoob/three.js#11746
• https://github.com/spite/THREE.UpdatableTexture

[ivanpopelyshev]

I guess its time to discuss it in issues :) Do the thing, I'll make sure that it will be approved.

Gonna say it one more time - that's why I've fought for #4507, I've spent half year to think about it, and it took 3 weeks of heated discussion to merge it. Now we have a base to implement things like that, it allows to add custom uploaders without code obfuscation.

[themoonrat]

Hi @m9dfukc - Did you get a chance to look at this? Sounds useful!

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