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netplay: let a title present its own sandboxed local view

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psx_mod_render_local_view() runs a title's draw code in the render-pass
sandbox on a forward netplay frame and keeps the drawn display rect in the
OpenGL presenter's surface only. The authoritative CPU VRAM, guest RAM,
rollback snapshots and digests keep the canonical frame; the presenter shows
this peer's own image. A committed image cancels any local-view crop.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Shokunin
2026-10-06 11:24:17 -07:00
parent c4215396e3
commit f379771c93
12 changed files with 286 additions and 26 deletions
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docs/NETPLAY.md
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@@ -161,6 +161,16 @@ that identical frame; only what its window shows changes:
savestate, and is ignored offline. The headless present-image ring records
the same rectangle, which is how a harness checks it. Vulkan, which netplay
replaces with the software present, ignores it.
- `psx_mod_render_local_view(cpu, rect, fn, user)` (`mod_plugins.h`): this
peer draws its *own* image of a display rect with the game's code, for
example its seat's single full-screen view, inside the render-pass sandbox
(docs/RENDER_PASSES.md, "Netplay local view"). The machine is restored
afterwards, so the canonical frame stays in the authoritative VRAM, rollback
snapshots and digests; only the OpenGL presenter's surface keeps the image.
A committed image cancels any `psx_netplay_present_local_view` crop
(`psx_netplay_local_view_clear`). Forward netplay frames only; a title falls
back to the crop when `psx_mod_render_local_view_status()` is not ready
(software present, Vulkan, resimulation).
---