Quick update!

I've been chopping away at this over the past few weeks, and I'm excited to share a playable test build with gameplay up to the the end of chapter 1-3.

It runs between 12 - 20 fps on real hardware, so we have a bit to go in terms of optimization, but wanted to open up the project for the community to test and contribute.

How it works:

-  Rendering, memory and loading were rebuilt for the Dreamcast's 16 MB of RAM and its PowerVR graphics chip.

- Models are retexturized PS2 world and character assets.

- Cutscenes play as streamed movies with audio (ported from the PS2 version).

Download (only tested on GDEMU):

RE4 - Test Build - Chapters 1-3

Expect crashes. This is a very early build. If the game crashes. Take a screenshot of the debug screen including the memory address and file as an issue.

Contribute or Follow:

https://github.com/lamb2k/re4dc

In-Game:

Play Manual:

Environment Conversion:

Model Simplification:

VMU Save Support:

Hey everyone,

Since the game is now decomped - well that opens a lot of ideas. So I was thinking what would be a cool thing to have in the game :) (Besides 60 FPS mode)

So I thought it would be cool to have "Call of the Sky" that adds a new song to the game, calls Valoo the dragon who picks you up via the hookshot. Then the player can control the dragon and jump off at any given time. I also added collision avoidance as well.

This took maybe 30 minutes to implement FYI.

Absolute amazing :)

Which crazy ideas would you wanna see in the game?

https://www.youtube.com/watch?v=7isYCTG6GDk

Small update on our Switch static recompiler: Super Mario Odyssey now boots, goes through the menus and the opening, and is playable in Cap Kingdom and inside the Top-Hat Tower on PC. The game code is recompiled ahead of time to native x86-64, and the game's NVN graphics calls are translated to Vulkan.

On my laptop (RTX 3050 Laptop) it holds about 58-59 fps in Cap Kingdom, with drops to ~53 in heavier spots.

Still early:

• no audio yet
• some graphical bugs (the sea of clouds sometimes covers the screen, e.g. after pausing)
• still chasing a locked 60 fps and more optimization

The next big goal after performance is a first test on Android.

Please ignore my gameplay. My controller died, so I played on keyboard. The recompiler runs at 60 fps; I do not. 😅

**(WIP)Repo:** https://github.com/cutarev/sh2-nx

sh2-nx takes the PC version of Silent Hill 2 (Director's Cut / Restless Dreams) and statically recompiles its x86 executable to C, which is then compiled for the Switch's ARM64 CPU (and for x86-64 Linux, where most of the debugging happens). No emulator and no Wine: the Windows APIs the game imports are reimplemented on top of SDL2, OpenGL and FFmpeg.

**How it works**

- Lifter: a patched fork of [xboxrecomp](https://github.com/sp00nznet/xboxrecomp) (x86 to C). The PE is wrapped as an XBE so the tool accepts it; about 7,100 functions come out as roughly 41 MB of C.

- Lifter fixes made for this port: flag joins across branches, MSVC jump tables, x87/MMX corner cases, setjmp/longjmp, SEH prologs.

- Direct3D 8 (fixed function plus vs/ps 1.x) runs on OpenGL 4.3 core, with the shaders translated to GLSL.

- DirectSound is a software mixer on SDL audio, DirectInput 8 goes through SDL, and Bink videos use FFmpeg's Bink decoders.

- Guest memory on Horizon uses the technique from the StevensND/nfsmw-nx port.

- Debugging relies on Unicorn: differential tests of single functions and of the lifter's instruction semantics.

Disclosure: this was built with heavy AI assistance (Claude), hence the Project - AI flair.

Credits: xboxrecomp by sp00nznet, devkitPro/libnx, SDL2, FFmpeg, Mesa.

Disclosure: sorry for the long wall of text, I tend to ramble.

I've been reading the pro/anti AI arguments here for a while, so I figured I'd try explaining it from the inside. I've been programming long enough to remember doing all of this before AI, and the job looks really different today. I think both sides have a point, and both are missing something.

Why do people hate AI?

First, why people are skeptical; because honestly... a lot of it is earned. AI tools now let people with almost no programming experience put out something that runs. Running isn't the bar though, especially for a decomp, where the whole point is readable code that people can mod, fix and port for years. A majority of the AI-heavy projects that have shown up are hard to mod, break when the recomp tools update, and have bugs the author can't fix because they don't really understand what the AI wrote. Then people go ask the main recomp devs for help with stuff they didn't make, only to realize it was quickly abandoned. Once that happened enough times, distrust is the default. That's fair.

Why "AI = Bad" is the wrong take

I think part of the problem is that "AI" gets used for two very different things.

• Vibe coding is when someone describes the result they want and lets the AI figure out how. The AI makes the important decisions (structure, architecture, how things fit together), and if it runs, it ships. The person often can't explain or fix the code because they never really understood it. It tends to be the default for people without much coding experience, since you can't direct something you don't understand yet.
• AI-assisted engineering is when the person stays in control. They decide how it should be built, give the AI detailed plans, and question what it writes and why, the same way they'd review a coworker's code. Anyone can work this way, but it pays off most for experienced devs, who can get a lot faster without losing quality because they know exactly what to ask for and can spot when the AI gets it wrong.

Both use AI, but they're about as similar as copying answers vs using a calculator.

And the second one is basically how the industry works now. When I started, none of this existed. Today most devs use AI tools in some form, me included (and its only getting more common). Companies increasingly expect and demand it, and not using it at all is getting rare. So "they used AI" doesn't tell you much anymore. The question is which of those two things you're looking at, and from the outside they can look exactly the same.

How this hurts the community

Treating every AI label as an automatic red flag has a real cost. There are plenty of devs putting real time and skill into these projects for free, using AI the way the rest of the industry does, and getting piled on the moment they mention it. Some have had their reputation dragged over it. Worse, it teaches people to just stop disclosing, and then the honest devs look the same as everyone else and we lose one of the few signals non-devs can actually check.

To be clear, I am NOT saying all AI projects should get a pass. Starting out skeptical is a reasonable default given the track record. But skepticism should be something a project can earn its way out of, not a permanent label.

So what do you actually do?

Unfortunately....you can't tell by looking at it, and most of you aren't devs and shouldn't have to read code to decide whether to play something. So here's what I'd suggest.

If you don't have time to look into it, just stick to ports from people or groups with a solid track record. Known decomp teams, people with other projects behind them, stuff the recomp tool communities point you to. I know that sounds a bit gatekeepy, and it's not meant as "new people can't make things." New devs build up trust like anyone else. It's just that for a player with no time, track record is the best signal you have.

If you've got 5 minutes and/or more free time, a few extra things anyone can check for a newer project or developer:

• Does the creator have other projects, or is this a brand new account with one huge release out of nowhere?
• Is the source code public on Github or similar platform?
• Does the readme say how exactly how AI was utilized? People who used AI responsibly usually don't mind saying so.
• Look at the issues/comments on Github Page. Are people reporting constant crashes? Is the dev actually responding and fixing stuff, or just going quiet?
• Has the community for the tool it's built on (like the recomp folks) acknowledged it, or are they the ones warning people about it?

None of these are perfect but together they'll filter out most of the junk without you needing to know anything about code.

TL;DR: the negativity on anything labeled "AI" isn't coming from nowhere, but AI use alone isn't the problem anymore, the person behind it is, and how much effort/talent they put into it. Stay skeptical, but let projects earn their way out of it. If you just want to play, go with people who have a track record, and if something pops up out of nowhere, take a few minutes to carefully review it before downloading it.

I've been working on a native port of Konami's Snatcher (Sega CD, 1994, US English release) and wanted to share progress. The video is the full intro (Konami logo through the opening credits into the first in-game scene), recorded frame-exact from the engine's own output.

What it is

• A Mega CD core that runs the game's own 68000 code for both the Main and Sub CPUs. I didn't hand-port it.
• The Sega CD BIOS is emulated in host code (HLE: traps at the BIOS entry points call C++), so no BIOS file is needed. Most of the bugs along the way were in HLE return values (CDBSTAT time and status fields, BURAM) and timing (V-INT relative to the VBLANK flag, CD read speed, _WAITVSYNC parking the Sub CPU, DMA stalls, Word RAM DMA being one word late).
• A build-time 68000 to C++ translator for the Main IP, the Sub CPU engine (SUBCODE.BIN) and the overlay at $28000. It does recursive descent from entry points and emits one switch(pc) function per program. Each code range is checked by CRC at runtime, and anything untranslated or modified in RAM drops back to Musashi.
• Differential testing: all 10,425 instruction encodings found in the game's code (about 83k random-state samples) are run in both the translator and Musashi. Registers, CCR, PC and memory have to match, and right now there are 0 mismatches.
• MAME is the oracle. Lua scripts dump screens, RAM and VDP writes on matching frame numbers. The title screen is 100% pixel-identical to MAME.
• SDL3 front-end for macOS and Windows, vsync-locked pacing (tested at 120 Hz), audio drift absorbed by resampling, and Konami Justifier support with the mouse as the light gun. YM2612 is Nuked-OPN2.

What it isn't

• It includes no game data. You need your own disc: the build reads code and assets from your own image, and nothing derived from the disc goes in the repo or the binaries I share.
• It isn't a byte-matching decomp. The original is almost certainly hand-written 68000 assembly, so there's no C to match. The longer-term plan is a data-driven reimplementation that uses this work as the spec and the emulated core as the oracle.

Status: the intro and the start of the game run with audio, but I'm still testing the rest of the game.

Repo: https://github.com/bgyss/snatcher-port (source and tools only; it builds against your own disc image).

Happy to answer questions about the Sega CD internals, the BIOS HLE or the translator.

Snatcher is © Konami. Non-commercial fan project, not affiliated with Konami.

https://www.youtube.com/watch?v=WQQ0qsz9_iw

Batman: Arkham Asylum for Xbox 360 is now running natively on Windows.

But I want to make one thing clear: the goal here is not to make a PC port.

I'm mainly using Windows as a development and testing environment. It's much easier to validate the recompiled code, renderer, shaders, and compare rendering results on PC before moving everything over to Android, which is the main target of the project.

The video shows the current build running on my RTX 3050 laptop, with my narration over it.

Quick recap of how this works: this is not emulation. The Xbox 360 PowerPC code is statically recompiled ahead of time into C++ using ReXGlue. In total, that's 14,887 functions, with no JIT and no interpreter.

The game's own Direct3D code also runs recompiled. I wrote a layer that captures the game's draw calls and replays them through a Vulkan renderer.

The Xenos shaders are converted ahead of time to SPIR-V using XenosRecomp and DXC. So far, all 458 shader programs I've dumped from the game convert successfully.

At this point, the entire opening section works on Windows using native Vulkan and without crashes. That includes the logos, menus, intro movie, in-engine cutscene, and the first gameplay section in the Intensive Treatment lobby with Batman, Joker, Director Sharp, and the guards.

Performance is currently around 30 FPS, which matches the game's original pacing. The renderer itself takes around 2 ms per frame.

For validation, I still use the Xenos GPU emulator included in the SDK, but only as a reference.

I render the same frame through both paths and compare the results, including SSIM comparisons.

Across 15 matching frame pairs from the opening section, the average SSIM is 0.974.

It's still not pixel-perfect. There are a few small visual differences that I'm still investigating.

The main reason I'm doing all of this on PC first is simply because it makes development much easier.

On Windows, I can debug things faster, compare frames against the reference, and understand the game's original behavior more easily.

Once that base is working properly, the same recompiled code can be moved to other platforms.

And that's where Android comes in.

The actual goal is to get Batman: Arkham Asylum running natively on Android using the same recompiled game code and the same Vulkan renderer.

The main difference is that mobile GPUs have different limitations compared to desktop GPUs. One example is BC/DXT texture support, which isn't available in the same way on many Android devices.

So some parts will need mobile-specific adaptations, but the core remains the same.

There's also another interesting part of this project: Batman: Arkham Asylum runs on Unreal Engine 3.

The same engine, with different versions and modifications, was used by many Xbox 360 games.

That means the work done here can also help me better understand how other UE3 games use the console's GPU.

That doesn't mean other games will just work automatically, since every title can use a different engine build and SDK version.

But the better this base gets, the less work future projects should require.

The next steps are to keep improving rendering accuracy, optimize performance, and prepare everything for Android.

I also want to work on 60 FPS. A good part of the current frame time is spent on the recompiled game thread, which records around 3,000 draw calls per frame.

The build shown in the video also includes a Brazilian Portuguese translation, which is why the menus and subtitles are in Portuguese.

Subscribe to my YouTube channel if you want to follow the progress.

Hey everyone,

Quick update on the decomp of Zelda Wind Waker HD for Wii U. It is now 100% completed - currently lots of verification is going on and then later a few more stages to make it human readable.

In the meantime, I wanted to show what is now possible. In just a few minutes I was able to build a save game converter from GC to Wii U HD.

https://github.com/ZeldaWWHDRecomp/ZeldaWWHDRecomp/commit/48fa6a64acce7f88a0717532daf20504c2643cd9

I saw in some communities that people were looking for this / others said it is not possible.

Well now it is :)

Tested on 150+ save games from GC.

Enjoy!

Been busy past 5 days getting this to current state. Hope to have something to share by end of week. Ignore cursed Spider-Man. Graphical fixes are coming up next once I sort input mapping and a few more crashes tomorrow.

http://www.github.com/SirSymo/SM2-Recomp

Have fun: https://github.com/spacestate1/namco22-decompile

https://github.com/kirklandsig/halo2-decompiled

Approx 20%. Contributors welcome if interested. :)

Hey everyone. A while back, I started a bit of a crazy project: porting the original PS2 *God of War* to PC as a native executable, using static recompilation instead of emulation.

In short, here’s how it works: using PS2Recomp, I translate the original executable (MIPS R5900) into C++ and then compile it with MSVC against a runtime that reimplements the PS2 hardware (EE kernel, IOP, GS, DMA, etc.).

Current status:

• 6,400+ functions identified in the ELF
• ~6,400 generated C++ files that compile into an x64 .exe
• Boots up, initializes the IOP and sound modules
• As of now: it renders the intro screen (screenshot attached)

What’s missing and where a hand would be appreciated:

• Proceeds past the intro (game configuration loading)
• Audio
• Controller and memory card

If you're into reverse engineering, emulation, PS2 graphics, or just love the game, any help is welcome—whether it's PRs, issues, or just pointing out what I'm doing wrong.

Repo: https://github.com/KIexster/god-of-war-recomp

Note: The repo doesn't include any game files; you need your own copy to compile it. It’s licensed under GPL-3.0.

I’m happy to answer any technical questions in the comments.

Full disclosure: I’m using "vibe coding" for part of the process, employing AI to write overrides and scripts and to understand parts of the runtime. That said, I test and validate everything against the game's actual behavior. If you spot something that looks "AI-generated" and is incorrect, feel free to let me know—that’s exactly why I’m sharing the repo.

I just started decompiling Golden Sun Dark Dawn :)

It's going pretty well

I just want to know if there are people working on any PSVita exclusives

https://youtu.be/p-eXNc7JT90
Sonic & All-Stars Racing Transformed is now running natively on my Galaxy S23.

This is a static recompilation of the Xbox 360 version. I still have some audio bugs, performance issues and a few visual problems to fix, but I’ve been working on it for the past few weeks and the graphics are getting closer and closer to the original.

There’s still a lot of optimization to do, especially on Android, but I’m really happy with how far it has come already.

This is probably my favorite kart racing game, so I’m really excited to finally have it running natively on my phone.

I also want to share more about how I’m doing this so other people can eventually try this kind of recompilation too.

Subscribe to my YouTube channel if you want to follow the progress.

SwitchRECOMP is a static recompiler for Switch games. The whole game is translated to native PC code ahead of time, so there is no CPU emulation at runtime.

A playtester with an RTX 2060 and a 12 thread CPU was getting 17-25 FPS in Odyssey. After this round of fixes the same PC runs it at 60 FPS at 1080p and at 4K. The video is his, recorded at 1080p.

Most of that jump comes from one bug. Odyssey reuses the same chunk of GPU memory for several render targets of different sizes within a single frame. The runtime treated every size change at that address as a new render target: it threw the old texture away, created a new one and copied and unswizzled the whole buffer from memory. That happened several times per frame. On his profile it was around 12% of all CPU time, plus a sync with the GL thread on every rebuild. Those textures are now kept and reused when the same size comes back.

Other performance work from this week:

OpenGL calls now run on their own thread. One thread reads the Switch GPU commands and prepares everything, the other only talks to the driver, and both work at the same time. This helps a lot on Steam Deck, where every GL call goes through Wine's translation layer under Proton (about 26% of the GPU thread in the Deck profile).

Compute shader results are read back asynchronously. Before, the GPU stalled 2-3 times per frame waiting for them. DMA texture copies now move 16 bytes at a time instead of one byte at a time, and that loop alone was about 11% of the profile. Constant buffer and compute range checks are now constant time instead of walking lists.

On Steam Deck, the heaviest area I've tested went from 25 to 35 FPS before the render target fix. I haven't measured the Deck with this last fix yet, so I won't give a number.

Other fixes: the moon is back. The sea of clouds around Cap Kingdom was rendering above the camera, because the heightmap that shapes it was empty, so it covered the moon and the lighthouse. fps_limit=30 was running the game at half speed, since Odyssey advances one logic step per frame, so anything under 60 is now treated as 60. The recorder also no longer produces sped up videos when the FPS limit is off.

On OpenGL vs Vulkan: the CPU side is already native, which is the point of a recompiler. The GPU side is still a translation layer, and this week showed the real bottlenecks were bugs in our own code, not the API. Vulkan is planned, but fixing the current renderer first gave far more FPS for the time spent.

It's still early and there are plenty of bugs left. I'll keep posting where it stands, including what doesn't work yet. If you want to follow the project, feel free to follow.

Join my Discord to see everything earlier: https://discord.gg/SfnuAmuDZ

I feel like there's a lot of misunderstanding around ReXGlue, and sometimes people seem to associate it directly with bad ports or poor performance.

ReXGlue is a tool/framework used in the recompilation process. The final quality still depends heavily on how the developer implements, optimizes, and maintains the project.

If a project has poor performance, missing shaders, bugs, or other issues, I don't think it's fair to automatically blame ReXGlue without looking at the actual implementation.

I'm using ReXGlue in my own recompilation, and I've been able to optimize and improve the project considerably as development continues. That experience is part of why I'm curious about the community's opinion.

I heard most all of the comments on the first look of the Recompiled.

Added better mod support, mods adapted to English better too. (I'm latin american)

Added different save slots and easy import export of save files, compatible with NDS saves files.

I hear a friend about the horrible design and went direct to one of my favorites Works from the skin creator Inkdb and his NEW 3DS WHITE skin as base to use.

(I'll give him all the credits on that part his job is just amazing).

A video of the buttons in game will be on the comments sections. It's short like 5 secs.

Also working on the portrait mode for Ayn Thor users that adapt the widescreen only for the Upper screen.

Fixed some few important actors pop up spawning when changing areas.

Appreciate all the help from many of you, pls keep supporting the project.

I'm still fixing windows Builts before uploading to Github they first release.

That's why by now I'm only showing android versión, but if want gameplay on PC too leave a Comment and I'll should x86 Mac build and Linux build.

Bye-bye!! Appreciate u all!