SlicerWGPU

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SlicerWGPU

Key Investigators

• Steve Pieper, Isomics, Cambridge MA, USA
• others interested?

Project Description

Explore the utility of using WebGPU from python in Slicer.

A working prototype already exists here: https://github.com/pieper/SlicerWGPU

Objective

1. Bounce the idea off people as a sanity check
2. Collect ideas for possible use cases
3. See if anyone wants to try implementing something practical

Progress and Next Steps

• Discussed the approach with several colleagues and confirmed interest in more experiments
• Presented, demoed, and discussed at the Slicer rendering breakout session
  • VTK.js is already working with prototype WebGPU functionality
  • It looks like VTK C++ will probably be going with WebGPU via Dawn in the comming years so there should be synergy and likely the ability to share shader code with anything developed via SlicerWGPU
• Improved the readme for the SlicerWGPU repository
• Collecting ideas for proof of concept experiments to test cross-platform performance

Illustrations

Figure 1: Simple compute shader example that inverts the values of a volume.

@group(0) @binding(0)
var<storage,read> data1: array<i32>;
@group(0) @binding(1)
var<storage,read_write> data2: array<i32>;
@stage(compute)
@workgroup_size(1)
fn main(@builtin(global_invocation_id) index: vec3<u32>) {
    let i: u32 = index.x * @@SLICE_SIZE@@ + index.y * @@ROW_SIZE@@ + index.z;
    data2[i] = -1 * data1[i];
}

Figure 2: Example WGSL compute shader code.

Figure 3: Off-screen GPU render example.

Background and References

See the README for links and background.