Witcher 3 MFG Bridge - RTX 40xx Multi Frame Generation

ABOUT THIS MOD

Witcher 3 MFG Bridge is a compatibility bridge for The Witcher 3 Next-Gen (DX12) that allows DLSS Enabler to drive Multi Frame Generation on RTX 40-series GPUs.

The Witcher 3 Next-Gen ships with NVIDIA Streamline 1. 5. 6, which has no frame-multiplier concept at all and cannot expose Multi Frame Generation to external tools. This bridge keeps the game's expected Streamline 1 interface intact while running a real Streamline 2. 11. 1 runtime beside it. Frame generation is routed through the Streamline 2 path, where DLSS Enabler can apply its MFG multiplier.

On my RTX 4070 test setup this gives x3 frame generation: roughly 40 FPS to around 100 FPS at the same in-game settings.

The bridge does not patch game logic, does not redistribute any game content, and does not touch licensing or DRM. It is an API shim between two versions of a public NVIDIA SDK.

Source code, full technical write-up and issue tracker:

github.com/not-JASH/w3-mfg-bridge

WHAT'S NEW IN 1. 0. 0

This is the first stable release. It fixes the persistent stutter reported against 0. 4. 0.

The stutter is fixed. DLSS-G cannot pace generated frames without an active Reflex signal on the Streamline 2 side, and it was never getting one. Two separate problems were responsible:

• []0. 4. 0 read the per-frame Reflex marker from a field that does not exist in the Streamline 1 structure, so it was reading padding.[/]

  []More importantly, The Witcher 3 drives Reflex through NVAPI directly and never emits Streamline Reflex markers at all, so there was nothing to forward in the first place.[/]

  The bridge now synthesizes the per-frame latency marker sequence and sleep that DLSS-G needs. In testing this took the underlying error (eDLSSGStatusFailReflexNotDetectedAtRuntime) from 5432 occurrences per session to zero, and resolved the stutter.

  A second, smaller stutter source was also removed: frame generation options were being re-sent every single frame, which races Streamline's own present path. They are now applied only when something actually changes.

  The multiplier ceiling is now detected and reported rather than assumed. See the section below — this replaces the old "x3 is the ceiling" note, which was only true of my machine.

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  REQUIREMENTS

  []The Witcher 3 Next-Gen, DX12 executable.[/]

  []NVIDIA RTX 40-series GPU.[/]

  []Recent NVIDIA driver, R570 or newer recommended.[/]

  []DLSS 310-series DLLs in bin\x64_dx12: nvngx_dlss.dll, nvngx_dlssg.dll[/]

  [*]DLSS Enabler 4. 8.x, installed separately usin