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WebGPUPathTracer: Adjust PCG random usage in Wavefront Path Tracer#752

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gkjohnson wants to merge 11 commits intowebgpu-pathtracerfrom
webgpu/random-fixes
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WebGPUPathTracer: Adjust PCG random usage in Wavefront Path Tracer#752
gkjohnson wants to merge 11 commits intowebgpu-pathtracerfrom
webgpu/random-fixes

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@gkjohnson
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Based on #751

  • Delete unused "pcgCycleState" function
  • Add "getPcgSeed" & "setPcgSeed" functions
  • Use accessor functions in wave front rather than accessing g_state directly
  • Ensure pcg seed state is set correctly in the wavefront ray intersection kernel

cc @TheBlek

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