psx_mod_render_pass_plan() / psx_mod_render_pass() let a trusted plugin
redraw its game between two logic ticks with the game's own draw code. A
pass is a sandboxed nested guest call:
- time is frozen: cycles are counted (GTE and mult/div deadlines keep
working) but no device advances, no VBlank or device event fires and no
interrupt is delivered; GPU linked-list DMA and delayed completions finish
synchronously (psx_cycles freeze, interrupts, dma);
- stores go straight to RAM/scratchpad, bypassing code-page tracking,
overlay watch and write traces; MMIO is an allow-list (GP0, GP1 DMA mode /
info, GPU and OTC DMA, I_STAT/I_MASK) and SPU, CD, timer and other device
stores are dropped and counted (memory.c);
- afterwards CPU (with the GTE), RAM, scratchpad, I-cache tags, interrupt,
timer, DMA and GPU registers are restored exactly (render_pass.c, a GPU
register checkpoint without savestate side effects), with a guest-cycle
watchdog that rolls a runaway pass back;
- on OpenGL the declared display rect (hr colour + mask stencil, raw mirror,
native-wide band, CPU VRAM rows) is backed up, drawn, captured and rolled
back; writes outside it are journaled and restored, or refused.
The presenter keeps two generations of images (the game's own frame plus
one image per pass phase), promotes one when the flip-aware source sees the
display flip to its rect, and shows the newest image at each output
deadline's phase, crossfading across gaps when passes were shed. Presents
that fall due while passes run are made between them. The plan predicts the
output deadlines of the coming frame and sheds passes to fit a host-time
budget learnt from the presenter's idle time (PSX_RENDER_PASS_BUDGET).
PSX_MOD_FRAME_INTERPOLATION_HOLD repeats the newest frame where no pass
image applies, so a pass-driven title never shows anything later than stock.
Default off: nothing runs unless a plugin calls the API, and the plan
refuses in netplay, rollback, rewind, turbo, self-check resimulation, while
suspended (FMV) or without GL flip-aware interpolation. Pass writes are kept
out of frame_fingerprint. Debug: render_pass_stats, render_pass_dump,
PSX_RENDER_PASS_VERIFY=1 (state + VRAM hashes around every pass).
The freeze API lives in the runtime-only psx_cycle_freeze.h. psx_cycles.h is
part of the overlay codegen hash and stays byte-identical, so titles that
never use passes keep their overlay caches and savestates.
Tests: render_pass_plan_test (deadline-exact phases per rate, shedding,
selection), render_pass_freeze_test (10^6 frozen cycles, exact restore,
watchdog), render_pass_guards (sandbox choke points; the codegen-hashed headers stay
free of the pass API).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
interp_capture's FLIP decision moves into frame_flip_is_new_frame()
(frame_interpolation.c), unit-tested in frame_interpolation_schedule_test.
A new source guard, frame_interpolation_flip_source (recompiler ctest),
pins what no unit test reaches: main.cpp hands the session's source to the
renderer at every session start, right after its interpolation settings;
interp_capture feeds the origin and the redraw test to the decision and the
tracker and returns before the copy on a duplicate; both present paths pass
the display origin and present_dirty_test; a source change restarts the
history. Deleting the hand-off, or never returning on a duplicate, now fails
the guard (both passed every test before).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
psx_mod_set_frame_interpolation_source(PSX_MOD_FRAME_SOURCE_FLIP) makes the
OpenGL presenter rotate its blend history only when the guest really flips
(the displayed VRAM origin moves or the displayed rect is redrawn) and spread
one crossfade over the measured flip period. A game that flips every second
VBlank (R4 races) used to blend for one VBlank and hold for the next; it now
blends across its whole frame.
VBLANK stays the default. reset_mod_owned_presentation() puts it back at
every session start (first boot and the lobby rematch), next to the blend
mode, so titles that never call the setter keep today's code path and a
netplay session never inherits it. begin() is begin_phase(0, 1) and stays
bit-identical (test). gl_interp reports the source, the flip period,
captures and duplicate VBlanks.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Shokunin