Add support for dispatchWorkgroupsIndirect

[HongchengZhao]

Description

Now that drawIndirect is supported in WebGPURenderer, I think it is also helpful to add support for dipatching compute shaders indirectly.

Right now I have two compute shaders A and B. A's compute count is determined by B's output. So having the dispatchWorkgroupsIndirect feature would greatly help boost my application's performance.

Solution

Add a computeIndirect(indirect: IndirectStorageBufferAttribute) method to TSL Node class. And each ComputeNode can hold an indirect attribute, which can be used to dispatch workgroups indirectly.

Alternatives

N/A

Additional context

No response

[Spiri0]

I'm wondering what you mean by dispatch indirectly. Please help me understand it a little more clearly.
Are you looking for a higher-level TSL functionality? More automation?

@Mugen87 If this is @HongchengZhao's wish, the TSL label would be appropriate here, since the DrawIndirect functionality as I envisioned it with the compute shaders, buffers, structs and structArrays is fully functional since r176.

P.S. Ah, I see in the W3C docu. That's a wgsl command

[Mugen87]

Fixed via #31488.