Redline Recompiled

Redline Recompiled 0.1

A PC port of Forza Motorsport (Xbox, 2005), made by static recompilation.

The game's own code, translated from Xbox x86 to 64-bit Windows code, runs natively with a new graphics, sound and input layer. It plays at up to 144 frames a second, at up to 4x resolution, in widescreen and ultrawide, with keyboard or any controller.

Not affiliated with Microsoft or Turn 10 Studios. Nothing of the game comes with this download: the launcher builds the port from your own copy of the disc, on your PC.

Screenshots

With the optional 4x texture pack	With the original Xbox textures

The launcher	Its settings

What you need

• Windows 10 or 11, 64-bit, and a graphics card with DirectX 11.1 (a dedicated card; integrated graphics run it at about 25 frames a second). DLSS needs an NVIDIA RTX card; FSR 3 runs on any DirectX 12 card.
• Your disc image of Forza Motorsport (USA) (Rev 1): an .iso file, or a folder with the disc's files (Forza.xbe and media). The launcher checks that it is this version; others are not supported.
• Python 3 from python.org (tick "Add python.exe to PATH" when installing). The launcher offers to install the three packages it needs (capstone, Pillow, numpy).
• Visual Studio C++ build tools: the free Build Tools for Visual Studio with the "Desktop development with C++" workload (or Visual Studio with it).
• About 6 GB of disk space, and an internet connection during the build: it downloads NVIDIA's DLSS and AMD's FSR files from their GitHub pages (each file checked against a known checksum).

Install and play

1. Download RedlineRecompiled-0.1.0.zip from the Releases page and unzip it anywhere you like (a path without unusual characters is safest). (The green Code button's download has no launcher in it: python tools/build.py --launcher makes one.)
2. Run RedlineLauncher.exe.
3. Drop your disc image (or the game folder) on the launcher, or choose it, then press Build. The build extracts the disc, finds and translates the game's code, and compiles it; it takes a while, and the launcher shows each step. If it stops, the launcher shows why.
4. Press Play.

The game's files go to game\, your saves to hdd\Partition1\UDATA (the launcher's Saves link), and the game's log to build\redline.log (Logs). To update the port later, unzip the new version over this folder and press Rebuild: your saves and settings stay.

Controls

Controllers: Xbox, PlayStation, Switch and most others, plugged in at any time. Buttons go by position (the bottom face button is A); the right shoulder is the Xbox's Black button, the left one White.

Keyboard, two sets that change by themselves between a race and the menus:

Racing		Menus
W / Up	accelerate	Arrows or WASD	move
S / Down	brake	Enter or Space	select
A D / Left Right	steer	Esc	back
Space	handbrake	Tab / Backspace	Start / Back buttons
E / Q	gear up / down	X, Y	X, Y buttons
C	look back	E / Q	Black / White
Z / X	look left / right	Page Up / Down	triggers
V	camera
H	HUD
Esc	pause

Both sets can be changed in the game: Recomp Settings > Driving keys / Menu keys.

Settings

In the launcher (Settings) or in the game's main menu (Recomp Settings); they are the same settings.

• Render scale 1x-4x: draws each frame larger, for a sharper picture.
• Upscaling: FSR 1, NVIDIA DLSS, AMD FSR 3 or plain bilinear.
• Frame rate 30 (as on the Xbox), 60, 120 or 144.
• Texture filter, Borderless fullscreen (Alt+Enter also switches it), Widescreen, Ultrawide (a wider view on a 21:9 or 32:9 monitor, with the HUD at the screen's edges), Video mode (480p, 720p, 1080i).
• Enhanced audio and Speakers (5.1 and 7.1 get the game's surround mix).
• Quit Game is at the bottom of the main menu.

Optional: 4x textures and videos

The settings Texture pack and Upscaled videos use replacement files you make yourself from your disc (they come from the game, so they cannot be shared). This is for people comfortable with the command line, and it takes hours and a fast GPU:

• Textures: python tools/texextract.py (every texture on the disc into build\textures\dump), then python tools/texpack.py with Real-ESRGAN ncnn Vulkan unpacked to build\realesrgan\ (makes build\textures\redline4x).
• Videos: python tools/vidpack.py, which also needs ffmpeg and an NVIDIA card for its video encoder (makes build\videos).

What does not work

Xbox Live (shut down long ago), System Link and anything else online. Split-screen with two controllers has not been tried. If the game stops with an error, it says so in a box and names the log: please include build\redline.log when you report it.

Licence and credits

Redline Recompiled's own code is under the MIT licence; the files under third_party/ keep their own.

It uses SDL3 for controllers (zlib licence), function signatures from XbSymbolDatabase (MIT licence code, ODbL data), the kernel export list from nxdk (CC0), Capstone in the build tools (BSD licence), AMD FidelityFX Super Resolution (MIT licence; the signed FSR 3 libraries under AMD's licence), and NVIDIA DLSS (NVIDIA RTX SDK licence; DLSS is NVIDIA's). Forza Motorsport is Microsoft's; this project contains none of it.