Fix for multiplayer regressions caused by changes in frame timing - #773
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Fix for multiplayer regressions caused by changes in frame timing#773DAPTYX wants to merge 1 commit into
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…ation; MP frame-timing mitigation Fold the genuinely-better parts of dhewm3 PR dhewm#771 ("decouple rendering from game tics") into our own com_interpolate, plus the dhewm3 PR dhewm#773 multiplayer frame-timing mitigation. Both touch the same frame-timing files, so they land together. com_interpolate refinements (all archived cvars, default 1, no-op unless com_interpolate is set; applied to both neo/game/ and neo/d3xp/): - com_interpolateAim: low-latency mouselook. Overlays the pending, not-yet- simulated mouse-look delta onto the rendered view each frame so aiming tracks the mouse 1:1 instead of rendering ~16.7ms (one tic) behind. Exposed ABI- stably via a new idCommon::GetPendingViewAngleDelta() appended to the vtable (forwarding to idUsercmdGenLocal), not by changing idGame::Draw's signature the way dhewm#771 does. The mouse buffer is read non-destructively (only the tic clears it) and the sign/scale/invert + strafe/mlook gating mirror MouseMove() exactly, so it never steals input and doesn't hitch when a tic lands. The view weapon recomposes onto the produced renderView eye so the gun stays locked to the real-time aim. Shooting still resolves at the tic (no gameplay change). - com_interpolateAnim: sample animated entities' skeletal animation at the sub- tic instant (in UpdateRenderEntity), so monster limbs move smoothly above 60fps rather than stepping at the tic rate. Skips the view weapon, which owns renderAnimTimeOffset, to avoid double-applying. - com_interpolateCubic: cubic Hermite (Catmull-Rom) entity position instead of linear lerp, smoother through accelerations. Adds a second history sample (renderInterpOriginPrev2/AxisPrev2/HistCount). Stays strictly interpolation between the last two tics -- no extrapolation, no overshoot. Deliberately not ported from dhewm#771: extrapolation, com_maxFps (we already have com_maxFPS), and the MP async / renderView->time decoupling that PR dhewm#773 had to fix. Our approach keeps the game-DLL ABI stable, stays single-player-scoped, and preserves the eye-relative view-model + gui-glow-light interpolation. MP frame-timing mitigation (dhewm3 PR dhewm#773): use fixed USERCMD_MSEC timing in multiplayer (single-player still recalculates each frame), and skip the full- frame tic-sync sleep on an active server (clients keep it) to avoid the phantom localhost ping and client/server desync from earlier frame-pacing changes. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Attempt to isolate server work from the frame pacing changes in c2a14db (caused 16 ms ping, even on localhost) and abd8d4a (caused client-server desync) by restoring the multiplayer behavior. These changes resolved both issues for me.
Testing was performed on CachyOS. The faulty/fixed behavior could only be observed by connecting to the server, not on the client hosting the server.