Exposure: luminance weighting + no-post paths #28

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opened 2026-09-27 05:23:30 +00:00 by sky_line · 2 comments

sky_line commented

2026-09-27 05:23:30 +00:00

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Exposure math matches, but RenderDiffuseLuminanceScale and emissive aren't in the luminance; no-post / non-HDR post paths missing. See §2.3.

Source: research/vk_parity_audit.md (static audit, not yet runtime-verified).

Exposure math matches, but RenderDiffuseLuminanceScale and emissive aren't in the luminance; no-post / non-HDR post paths missing. See §2.3. Source: research/vk_parity_audit.md (static audit, not yet runtime-verified).

sky_line added this to the VK parity milestone

2026-09-27 05:23:30 +00:00

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2026-09-27 05:23:30 +00:00

sky_line added this to the Slipstream project

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2026-10-10 05:05:24 +00:00

sky_line commented

2026-10-10 11:53:09 +00:00

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Implemented 2026-10-10 (commits e5751aa189, 75ab77c11c).

Already in place before: the no-post path for vintage / HDR-off skies, and exposure maths plus tonemap types 0/1 matching LL.

Added:

LL luminance weighting in exposure metering: non-sky surfaces are scaled by RenderDiffuseLuminanceScale (re-declared, 0.5), and bloom is included. 1024 bilinear taps.
Snapshot "No post-processing" works again.
Build > Options > No Post-processing is restored.

Visible change: object-dominated views expose brighter, as in LL.

Test:

Close-up wall vs open sky with dynamic exposure on.
Build > Options > No Post-processing on and off (no pop).
World-only snapshot with No post-processing on and off.
HDR off is still clamp-only.

Implemented 2026-10-10 (commits e5751aa189, 75ab77c11c). Already in place before: the no-post path for vintage / HDR-off skies, and exposure maths plus tonemap types 0/1 matching LL. Added: - **LL luminance weighting in exposure metering:** non-sky surfaces are scaled by `RenderDiffuseLuminanceScale` (re-declared, 0.5), and bloom is included. 1024 bilinear taps. - **Snapshot "No post-processing"** works again. - **Build > Options > No Post-processing** is restored. Visible change: object-dominated views expose brighter, as in LL. Test: 1. Close-up wall vs open sky with dynamic exposure on. 2. Build > Options > No Post-processing on and off (no pop). 3. World-only snapshot with No post-processing on and off. 4. HDR off is still clamp-only.

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sky_line referenced this issue from a commit

2026-10-10 22:19:25 +00:00

VK exposure: LL luminance weighting + the remaining no-post paths (#28)

sky_line referenced this issue from a commit