Clang on arm64 contracts a*b+c into an FMA by default; x86-64 GCC without
-mfma never does. The software rasterizer's float edge/shading math then
rounded differently on a Mac and a Windows peer: +-1 colour steps on single
pixels, so VRAM (the av digest) diverged from ~sim 1800 in every
cross-machine R4 rollback race while the core digest still matched. Each
rollback baseline compare then aborted on "baseline av mismatch", and the
realigns forked the session (3P never reached the race; 4P diverged
mid-race).
VRAM dumps from the same Mac-host 2P race at 16 ticks between sim 1600
and 2080: 1-3 differing pixels in 5 of 16 frames before, 0 after.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The X4 co-op contract already fingerprints SPU and private audio sources. Defer the additional global execution-contract inputs, added after the approved Windows build, until a coordinated rebuild of both platforms. This preserves the owner-tested Windows artifact for playtest 2.
Opt-in under the render thread. Composed frames go to a ring of offscreen
slots at the window's size (binds of framebuffer 0 on the composing context
land on the current slot); a present thread with a second, shared context on
the same window waits on the slot's fence, copies it 1:1 and swaps. The
compositor's wait moves off rendering; the composing side waits only while
every slot is queued or on screen. Falls back to direct swaps when the shared
context or sync objects are unavailable.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
[video] frame_generation (opt-in, with render_thread): the render thread keeps
each game frame's replayed draw list, matches the triangles of the last two
(frame_gen.c), and presents in-between frames at the display refresh by
redrawing the newer list into separate surfaces with matched vertices
interpolated. It never runs guest code. Real frames are composed at their
flip and presented after the generated ones, with the same pixels and
order. Generation uses only measured surplus: a plan from render-thread CPU,
generated-frame cost and swap time, a breaker after backpressure or late
guest frames, and a pause while dynamic resolution is over budget. The
render-thread core gains a timed tick hook. Frame-cost queries pause around
generation, so dynamic resolution measures real frames only.
Tests: frame_gen_test, render_thread_test (tick), gl_frame_gen_test (real
frames identical off/on; phase 0/1 equal the endpoints). Docs:
docs/FRAME_GENERATION.md.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Backend-neutral core for the opt-in [video] render_thread: the emulation
thread appends records to a single-producer/single-consumer ring and the
render thread replays them in order with the graphics context current.
rt_frame_end bounds closed frames in flight (backpressure), the render
thread can tell a frame is stale, and rt_acquire is the sync point:
drain, then move the context to the emulation thread until rt_release.
No lock is held while a record executes.
render_thread_test drives it with a fake executor and context token:
ordering and payload integrity across ring wraps, oversize refusal, the
in-flight bound under a slow consumer, stale detection, randomized
acquire/release interleaving and stop while held (TSan clean).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A step controller (dynamic_resolution.c) lowers or raises the GL internal scale from frame-time telemetry between a floor and the configured ceiling; off unless a title or the player enables it. Tested by dynamic_resolution_test (synthetic load) and the real-GL gl_scale_invariance_test step modes.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Load modern texpage/texupload PNG replacements independently of DuckStation source. Integrate pack folders and options with mods, preserve native VRAM, and validate GL rendering, format matching, dump safety, and upload invalidation.
psx_mod_set_pad_transform(player, &PSXModPadTransform) registers stage 2b
of pad_external_input: after the physical pad and any controller source,
before the mouse policy. The transform sees the resolved pad plus the
port's host extras (gamepad present, LT/RT 0..255 from SDL, unthresholded)
and may rewrite buttons, sticks and the presented controller type, e.g. a
NeGcon whose I/II come from the triggers. Output is pre-filled as a
pass-through, validated (struct size, ranges, type within allowed_types)
and replaced by neutral when invalid; detaching or a mod/session reset
owes one neutral release frame. initial_type sets the boot/hotplug type.
The resolver stays pure: host extras arrive through a new capture hook and
the transform through another, both covered in pad_external_input_test.
Under the input guard the transform runs on zero triggers and its output
is neutralized. A NeGcon result resets the mouse policy rather than letting
it overwrite the I/II bytes. Offline only: netplay, resim, selfcheck replay
and plain debug overrides never reach it.
With no transform registered every pad is bit-identical to before.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
PsxNetPad type 3 is NeGcon, packed lx = twist, rx = I, ry = II, ly = L
(the rollback row's stick view carries twist and L). Every decoder accepts
up to PSX_NETPAD_TYPE_MAX instead of clamping at JogCon, and normalization
keeps NeGcon pressures exact (only twist gets the centre deadzone).
psx_pad_apply_to_sio() is now the one PsxNetPad -> SIO path for offline
sampling, netplay delay/rollback apply and selfcheck replay, so a type
added once reaches the guest the same way everywhere. Selfcheck replay now
matches offline sampling on multitap seats with the analog-on-tap hack.
psx_netplay_normalize_pad moves to a pure TU so tests link the real one
instead of a mirror. Pins recomp-net to the branch that keeps type 3.
Other titles: pads never carry type 3, so SIO bytes are unchanged.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Mouse policy now folds onto the resolved pad (source included) instead of a discarded capture; no-policy path does no mouse polling.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Alex Vanderveen