[Framerr]

Scope

Isolated trial of the production-code change only from Orchid PR #66. Downloads requested across multiple cached GPU buffers are clipped to each buffer's address intersection before DownloadBufferMemory is called.

This is not a verified fix for Pokopia's photo corruption. The Orchid multi-change Windows build tested by the reporter made photo corruption less frequent, but introduced 3D asset flicker. That outcome cannot be attributed to this individual correction.

Isolation / safety

• Based on current nx2; changes one implementation in src/video_core/buffer_cache/buffer_cache.h.
• No version bump, no release asset replacement and no automatic merge.
• Keep the Frameropia v0.0.1/0.0.2 baseline intact.
• Run the existing Windows CI and compare photos and geometry in the same Pokopia scene.
• If Flicker or other regression appears, close this PR without merging.

Validation needed

• Windows build passes from this exact branch.
• Capture >= 10 photos in the same scene on the baseline and this branch, recording clean/corrupt counts.
• Geometry stability passes with moving camera / assets at the same location.
• Confirm saves and loading are unaffected.

Related to #14. Original PR: MythosOfs/Orchid#66. AI-assisted port of the exact limited production change; original authors retain credit.

[Framerr]

Test result: confirmed regression (2026-11-08)

The reporter tested the isolated Frameropia build from this PR (experiment/pokopia-photo-readback-pr66) and found that every saved in-game Pokopia photograph was corrupted. Compared with the previous baseline, where some photographs were saved correctly, this change makes photo output consistently worse.

Outcome: FAIL. This isolated buffer readback range-intersection patch must not be merged as a Pokopia photo fix. This also provides a much clearer attribution than the earlier Orchid build, which included multiple changes. No claim is made about root cause or effects on other games.

Close this experimental PR without merging; preserve the branch and original code for reference. Do not change the released baseline.