BufferGeometry: Add indirectOffset parameter for indirect drawing

[holtsetio]

Description

This adds the indirectOffset parameter to the BufferGeometry class, corresponding to the indirectOffset parameter in the WebGPU drawIndirect/drawIndexedIndirect API functions

https://developer.mozilla.org/en-US/docs/Web/API/GPURenderPassEncoder/drawIndirect
https://developer.mozilla.org/en-US/docs/Web/API/GPURenderPassEncoder/drawIndexedIndirect

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	350.29 83.05	350.29 83.05	+0 B +0 B
WebGPU	613.38 170.32	613.55 170.35	+170 B +30 B
WebGPU Nodes	611.98 170.04	612.15 170.07	+170 B +32 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	482.23 117.82	482.28 117.83	+48 B +11 B
WebGPU	684.5 186.13	684.71 186.16	+218 B +32 B
WebGPU Nodes	634.32 173.31	634.54 173.34	+218 B +34 B

[holtsetio]

Next step would be to also add this to compute shaders, but I don't know yet how to do this the most elegant way. Add another param to the compute() call?

[sunag]

Next step would be to also add this to compute shaders, but I don't know yet how to do this the most elegant way. Add another param to the compute() call?

Hmm... It would be easier to visualize with an example, if you have one.