1193432 - Lazily copy layers::Image data into WebGL textures

Status: NEW

(Core :: Graphics: CanvasWebGL, enhancement, P5)

Description

[Matt Woodrow (:mattwoodrow)]

Generally when we use glTexImage2D with a video element, we only ever want to read from the texture.

In this case we can probably just use the original image directly (if it can be directly bound to a texture) until someone tries a write operation and then do the copy at that point.

On OSX at least, copying 4k video frames into WebGL is very expensive and skipping it would be a big win.

Comment 1

[Matt Woodrow (:mattwoodrow)]

Actually, we probably can't do this for OSX since the source texture is YUV.

It'll be a win on windows with DXVA though where we have RGB textures.