Support wgpu skybox example on webgl#3773

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Frizi wants to merge 2 commits intogfx-rs:masterfrom Frizi:wgpu-skybox-example

+414-202

Commits on Jun 3, 2021

add minimal support for cubemap textures in gl backend
Frizi
committed

Commits on Jun 11, 2021

add support for S3TC texture formats in gl backend
Frizi
committed