gl.texImage2D and HTMLCanvasElement

[stepancar]

Hello!
gl.texImage2D supports HTMLCanvasElement

In browser it works instantly , because under the hood they avoid moving data GPU -> CPU -> GPU

In headless gl implementation we see that in order to upload canvas to webgl it reads pixels from 2d context and then uploads it webgl

headless-gl/src/javascript/webgl-rendering-context.js

Line 3149 in f1ed92f

throw new TypeError('texImage2D(GLenum, GLint, GLenum, GLint, GLenum, GLenum, ImageData | HTMLImageElement | HTMLCanvasElement | HTMLVideoElement)')

Is it possible to speed it up somehow using just webgl?

[stepancar]

@ivanpopelyshev maybe you can suggest anything, thanks!

[stepancar]

If I understand correctly, we could create shared textures using EGL and pass them between contexts