WebGPURenderer: copyFrameBufferTexture() rectangle parameter added

[aardgoose]

WebGPURenderer.copyFramebufferToTexture() lacks the position parameter.
(used in LensFlare and the webgl_framebuffer_texture example.

Questions:

1. Which coordinate system should be used (0,0) as top left (WebGPU) or bottom left (WebGL)?

2. Should attempts to copy from areas outside the framebuffer cause errors? WebGPU fails with console warnings, WebGL ignores and returns 0 for those areas.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	685.83 169.75	685.83 169.75	+0 B +0 B
WebGPU	832.14 222.98	832.68 223.13	+539 B +146 B
WebGPU Nodes	831.65 222.86	832.19 223	+539 B +144 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	462.42 111.53	462.42 111.53	+0 B +0 B
WebGPU	529.9 142.75	530.44 142.9	+539 B +153 B
WebGPU Nodes	486.56 132.61	487.1 132.77	+539 B +154 B

[sunag]

1. WebGPU top-left.
2. console warnings is good

I think it should be a rectangle instead of just position.

[aardgoose]

By rectangle do you expect (x,y width, height) or (x1 y1, x2, y2)?

[Mugen87]

I vote for (x,y width, height).

[aardgoose]

I vote for (x,y width, height).

That is what I guessed, that is what is in place at the moment.