Webgpu multi threaded rendering

Questions
1

In WebGPU API, a GPUTexture can be created and sent to another worker thread as spec, so it could be possible to do real multi threaded rendering like:

  • main thread: create GPUTexture for each thread with depth enabled, split the scene into parts by mesh, initialize, dispatch events (frame render, input and camera change), composite render results with alpha and depth
  • worker threads: initialize scene parts, handle events, rendering to GPUTexture

Questions:

  • Is this possible for babylon.js?
  • Is it possible using offscreencanvas to do similar thing on webgl? Can depth be corrently handled?
  • Would this increase performance of scene containing lots of meshes (draw calls) near linearly by adding threads on a CPU with enough cores?
  • Are post processes required to be handled on main thread?
  • Can animations be handled in worker threads?
  • How would this compared to Snapshot Rendering?
  • Are transparent meshes supported by this?
2

As the link you provided says, multithreading is not yet implemented in WebGPU supporting browsers, so what you describe will not work.

Once it is implemented and we know exactly what is possible, we will need to study what can and cannot be done with it in the Babylon.js code base.

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