Probe capture: render all 6 cube faces in one multiview pass #1101

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opened 2026-10-26 03:24:34 +00:00 by sky_line · 0 comments

sky_line commented

2026-10-26 03:24:34 +00:00

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Experiment from the VR layered stereo design (step 14, research repo vr/VR_LAYERED_STEREO_DESIGN.md section 8.2).

Reflection probe capture renders each cube face as a separate view today. Vulkan multiview can draw the 6 faces as views of one pass (one cull, one set of binds and draw calls, gl_ViewIndex selects the face).

Why: probes are being removed under RT GI (#968), so the win is for cards that run without GI and still pay for probe capture every frame (see the probe cost notes; capture was ~1.7 ms/frame on the 5090).

Depends on the multiview feature bit and view-count spec plumbing from #1075 (steps 1-7). Measure capture GPU time before/after on the 5090 and the 1080 class; keep only if it wins (minimal-config rule: no persistent toggle).

Experiment from the VR layered stereo design (step 14, research repo `vr/VR_LAYERED_STEREO_DESIGN.md` section 8.2). Reflection probe capture renders each cube face as a separate view today. Vulkan multiview can draw the 6 faces as views of one pass (one cull, one set of binds and draw calls, `gl_ViewIndex` selects the face). Why: probes are being removed under RT GI (#968), so the win is for cards that run without GI and still pay for probe capture every frame (see the probe cost notes; capture was ~1.7 ms/frame on the 5090). Depends on the multiview feature bit and view-count spec plumbing from #1075 (steps 1-7). Measure capture GPU time before/after on the 5090 and the 1080 class; keep only if it wins (minimal-config rule: no persistent toggle).

sky_line self-assigned this

2026-10-26 03:24:34 +00:00

sky_line added this to the Slipstream project

2026-10-26 03:24:34 +00:00

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sky_line/Slipstream#1101

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