Alex Goldring (@SoftEngineer)

2026-01-23 | ❤️ 156 | 🔁 11

SSGI (screen-space global illumination) in WebGPU.

Technically this is “near-field diffuse screen-space ray-traced indirect lighting”.

We trace SSAO, and as we sweep arcs - we also integrate lighting along the occluded arc.

This is a very natural extension to GTAO or any other horizon-based technique, as it already sweeps arcs.

The irradiance is encoded in a u32 texture using rgb999e5, so it’s quite compact.

I’m not doing any denoising here, in practice you would apply at least spatial denoising.

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