raymondchins/Bridgeplay

Windows-only Steam games on Apple Silicon, right inside the Steam you already use.
Same library. Same Play button. No bottles, no second launcher.

Bridgeplay is a fork of NotProton by NotProtonNot. Games run on CodeWeavers' open-source Wine, the engine behind CrossOver, and Apple's Game Porting Toolkit. I'm not affiliated with either. If CrossOver works for you, buy it: that money is a big part of what keeps Wine on the Mac moving. Bridgeplay is a hobby project I maintain part-time, so support is best-effort. Full list in Credits and Support Wine.

_{Illustrations of the real screens.}

Developer's tests on an M5 Max MacBook Pro with Game Porting Toolkit 4.0 beta 3: 90+ fps, with MetalFX upscaling and frame generation where listed. Settings come from each game's launch log.

Also running on the same setup: Mortal Kombat 1, The Last of Us Part I, Death Stranding Director's Cut, Horizon Zero Dawn, Split Fiction, It Takes Two, A Way Out, Batman: Arkham Knight, Sifu, Ghostrunner, Ravenswatch, Megabonk, PowerWash Simulator 2, The Witcher 3.

_{Most games with kernel-level anti-cheat won't run.}

Every game tested so far, and the Mac it ran on, is at bridgeplay.dev/compatibility. It combines results a maintainer checked (compat/), one-tap reports from players, and CrossOver ratings from AppleGamingWiki for games nobody has tried with Bridgeplay yet.

To add yours: after you play, Bridgeplay asks once per game How did it run? One tap posts the result, with your Mac and the game's log, to Compatibility reports. No GitHub account needed, and the log is stripped of your user, computer and Steam account details. Report Your Games… in the Prefix menu covers everything you've already played. Without the app, use the Game report form.

1. Download the installer from bridgeplay.dev: Bridgeplay-Setup.zip, under 1 MB. It fetches Bridgeplay, Apple's graphics, the engine and Steam (from Valve, if missing) as it installs, and checks every download against Bridgeplay's signature.
2. Open Bridgeplay Installer. macOS blocks it the first time: READ ME FIRST.html in the download shows the three clicks, Done, then Open Anyway in System Settings > Privacy & Security, then confirm with your password or Touch ID. It needs an admin account.
3. Follow the Setup Assistant: Rosetta, graphics, Steam sign-in, App Management and a couple of other standard macOS prompts. Setup modifies your Steam app; see What Bridgeplay changes in Steam.
4. Press Play on any Windows game in Steam. The first time you use a controller, allow Steam's Input Monitoring request.

Each game's Bridgeplay settings (graphics backend, Metal HUD, DLSS, frame generation, controllers) are in Steam: right-click the game, Properties… › Bridgeplay.

Updates install themselves: Bridgeplay, its patch in Steam and the engine. Refresh on the Status page checks on demand.

The installer includes Apple's Game Porting Toolkit redistributables under Apple's license, which allows non-commercial distribution only. Bridgeplay is free and non-commercial.

Bridgeplay runs inside the native macOS Steam client and registers itself as a Steam Play compatibility tool. Under the hood:

• Engine: CodeWeavers' open-source WineCX 11.17 with MSync, running under Rosetta 2. Bridgeplay does not include CrossOver: its free engine is built from the LGPL source CodeWeavers publishes (dappermint/winecx). If you own CrossOver, Bridgeplay can run games on your copy instead.
• Graphics: Apple's Game Porting Toolkit 4.0 beta 3 (D3DMetal). It is not stored in this repository; the installer ships its redistributables under Apple's non-commercial license (see Install). DXMT and DXVK are available for games that prefer them.
• Extras: NVAPI/NGX routing for DLSS on Apple's MetalFX, in-process frame generation on CAMetalLayer, per-game Game Mode, Retina back buffers and a controller layer for HID pads.

Building from source: see docs/DEVELOPING.md, docs/ARCHITECTURE.md and docs/BUILD-LOCAL.md. The installer lives in installer/ and is packaged by scripts/package-installer.sh.

Bridgeplay modifies your Steam app. It copies a library (notproton.dylib) into /Applications/Steam.app, makes Steam load it at startup through Info.plist, and re-signs Steam on your Mac, replacing Valve's signature. The library hooks Steam's compatibility tool, shortcut and launch option code, and edits Steam's interface in memory to show Steam Play.

Also changed:

• Steam's default compatibility tool is set in config.vdf, and Bridgeplay's tools go in compatibilitytools.d.
• Steam's Accessibility and input permissions are reset (tccutil), so macOS asks again.
• Steam is signed with a local "NotProton Local Signing" keychain identity, or ad hoc, and loses Valve's hardened runtime.
• The quarantine flag is removed from Steam.app and Bridgeplay's folder, and Wine loaders are re-signed ad hoc where needed.
• Optional Block Steam client updates (steam.cfg) also blocks Steam's security fixes.
• The library loads for every macOS user of a shared /Applications/Steam.app.
• In games, Steam calls reach your Mac Steam through Proton's lsteamclient, via an in-memory redirect (ntdll-patch/).
• Games on D3DMetal see an NVIDIA GeForce RTX 4090 by default, so DLSS shows up. NVAPI=0 turns that off.
• For Apple's MetalFX DLSS only, patched crypt32 and wintrust pass NVIDIA's signature check on Apple's nvngx.dll (ngx-signer-patch/).
• Some gamefixes turn off a game's Wine check to unlock DLSS, for example in Resident Evil Requiem and The Witcher 3.

Valve doesn't support or endorse Bridgeplay, and modifying Steam may go against the Steam Subscriber Agreement. Use it at your own risk. Repair Steam or Remove Everything on the Status page restores Steam's Info.plist; if Valve's signature isn't back, reinstall Steam from Valve.

Online games with anti-cheat (Easy Anti-Cheat, BattlEye and others) often won't start, and Bridgeplay can't promise that anti-cheat, VAC included, won't flag it. Counter-Strike 2 and Dota 2 run, but VAC keeps them off its secure servers. Play online at your own risk. The compatibility list shows what other players found.

Bridgeplay is a fork of NotProton by NotProtonNot and its contributors (GPL-3.0), by way of Leon Seemann's NotProton-WineHQ. The Steam hooks, the Steam Play interface patches, the run script and the steamclient bridge all started as their work. Copyright and license details are in NOTICE.

• Engine: CodeWeavers' WineCX (LGPL-2.1-or-later), as rebased by dappermint and packaged with winecx-gptk.
• Graphics: Apple's Game Porting Toolkit (Apple's license), DXMT by 3Shain and DXVK-macOS by Gcenx.
• Steam bridge: lsteamclient and steam.exe come from Valve's Proton.
• Controllers and Game Mode: sn0wst0rm wrote the DualSense Bluetooth bridge, Steam rumble forwarding and game-mode host that Bridgeplay 0.7.51 and earlier shipped. They are paused until NotProton merges the same work (NotProton#90).
• Libraries: Dobby (Apache-2.0), Sparkle (MIT), SDL (zlib) and cJSON (MIT).
• Bridgeplay: everyone who has contributed.

NotProton in turn thanks the people who came before it, among them Nat Brown's Kaon, mont127's Neutron and Gio's work on Steam Play in Mac Steam; see docs/UPSTREAM.md.

Wine on the Mac exists largely because of CodeWeavers, the biggest contributor to the Wine project. They fund that work by selling CrossOver. Bridgeplay's free engine is built from the source code CodeWeavers publishes, so every game it runs also stands on their work.

If you can, buy CrossOver.

Bridgeplay is licensed under the GPL-3.0. Third-party licenses, and the source for the patched Wine files the app ships (LGPL-2.1-or-later), are listed in NOTICE.

 Built by Raymond Chin, Jakarta.

_{Bridgeplay is not affiliated with Apple, Valve, NVIDIA or CodeWeavers. Game Porting Toolkit is Apple software provided under Apple's license for non-commercial use. Steam is a trademark of Valve Corporation. DLSS is a trademark of NVIDIA Corporation. Game names are trademarks of their owners.}