Examples: Add webgpu_compute_particles_fluid

[holtsetio]

Description

This adds an interactive MLS-MPM based particle fluid simulation as a compute shader heavy example for TSL, using atomics, nested loops, structs, etc. Unfortunately it will only work in WebGPU, not with the WebGL Fallback.

Possible improvements:

• Add a more interesting environment
• Add screen space fluid rendering to achieve the look of water. However that is really complicated and I feel like this example is already complex enough.
• Disable AO by default or lower the default number of particles to make it run smoother on mobile devices.

live example

[WestLangley]

The ambient occlusion post-processing seems to be a performance killer when zoomed-in. It also makes little visual difference.

How would you feel about removing it?

[holtsetio]

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The ambient occlusion post-processing seems to be a performance killer when zoomed-in. It also makes little visual difference.

How would you feel about removing it?

Thought the same already, especially on mobile it's a performance killer. But it helps giving some depth to the visuals. Maybe not remove it, but just disable it by default?

[WestLangley]

I would avoid including a feature that diminishes performance for marginal benefit. So my preference would be to remove it.

I'd hate for something to detract from this excellent demo.

[Spiri0]

@holtsetio This would be very suitable to implement spray in my WebGPU Ocean repo.