[mvaligursky]

Rebuilds the graphics/video-texture example, which showed a washed-out video on a swinging slab, as a dark scene where one video texture plays on two surfaces.

Changes:

• A wall of 16×9 glowing tiles, each mapping its own part of the video through its texture coordinates. Waves of tiles flip and push forward every few seconds, each from a different point of the wall.
• A rounded cube (RoundedBoxGeometry) tumbles in front of the wall, with the whole video on each face.
• The video texture uses the sRGB format, so the video shows its real colors. The old RGBA8 texture was sampled as linear, which washed it out.
• The texture has mipmaps, and is created at the size of the video once its first frame loads.
• A new frame is uploaded only when the video has one (requestVideoFrameCallback), falling back to an upload every frame.
• A rectangular area light in front of the wall takes the average color of each frame, read from the 1×1 smallest mip level with Texture#read, and lights the floor with it.
• Bloom with neutral tone mapping, and orbit camera controls.
• New controls: Playing, Sound, Tile Wave and Wall Light toggles.

Examples:

• graphics/video-texture: redesigned, with new thumbnails

[github-actions]

Build size report

This PR does not change the size of the minified bundles.

Bundle	Minified	Gzip	Brotli
playcanvas.min.js	2799.9 KB —	727.4 KB —	563.6 KB —
playcanvas.min.mjs	2796.6 KB —	726.7 KB —	563.4 KB —