Core: WebGLRenderTarget extends RenderTarget

[sunag]

Description

Currently, RenderTarget of WebGPU is extended from WebGLRenderTarget which doesn't seem very logical, this update renames WebGLRenderTarget to RenderTarget and create a new WebGLRenderTarget extended from RenderTarget for backwards compatibility.

/cc @mrdoob @Mugen87 @LeviPesin

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

Filesize dev	Filesize PR	Diff
645.2 kB (159.9 kB)	645.3 kB (159.9 kB)	+102 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

Filesize dev	Filesize PR	Diff
438.3 kB (106 kB)	438.4 kB (106 kB)	+83 B

[sunag]

What do you think?

RenderTarget looks like with abstraction like CubeCamera and Texture does, I think this update might make hierarchy clearer in the future, mainly for WebGPURenderer.

[Mugen87]

I agree it does make sense to make this change. We have to consider WebGL and WebGPU when we design classes now and WebGLRenderTarget as a base class is confusing in context of WebGPU. A more generic RenderTarget class solves this issue.

[mrdoob]

Sounds good to me 👌