# SDOJ-Recomp

Dodonpachi Saidaioujou Recompilation using [rexglue](https://github.com/rexglue/rexglue-sdk).

# Requirements

- Your own DoDonPachi Saidaioujou Xbox 360 dump
- Title Update 1.01 file

# First launch

For the disc release:

1. Put the SDOJ iso beside the recomp executable.
2. Put the TU_11LK1V7... TU1 file in the same folder.
3. Run "launch.bat/launch.sh".

For the Games on Demand release:

1. Put a converted GoD iso beside the recomp executable.
2. Extract `CA022100.binp`, `CA022110.binp`, and `default.xexp` from the matching TU_...0085 file and put them beside the recomp executable.
3. Run "launch.bat/launch.sh".

The first launch extracts the ISO when needed and installs the three matching TU1
patch files into game_data.

For the later launches it verifies the existing game_data and
skips both extraction steps when they have already completed. After successful
setup, the ISO and TU container may be removed.

# Settings 

There are some hardcoded arguments in launch.bat/launch.sh. You can edit them as you wish, but don't remove `--xex_apply_patches=true`.

You can open the settings by pressing F4 in game. To turn on keyboard inputs, go to the Input tab and turn on `mnk_mode`. For best latency, it is recommneded to use `input_backend` set to `xinput`. To achieve more consistent results, running the game through Special K is recommended.

The saved settings are stored in the saidaioujou_recomp_tu1.toml config file.

# Known issues

### Slowdown

Slowdown is heavily tweaked compared to Xbox 360. The game is tuned to mostly match what you'd see playing on shmupmame 5.3.1, for both expert and regular modes. Xbox Arrange mode does **not** have any slowdown, as all the slowdown comes from the 360 lagging itself, thus, the slowdown will not be tuned for this mode.

### Other issues
- The render patch sometimes introduces graphical artificats
- The frame delievery is pretty bad right now, the game does not look very smooth unless you run it through Special K.
- Audio fadeout issues if not using Special K
  
# Building

### Windows

You need CMake 3.25 or newer, Ninja, LLVM/Clang with C++23 support, and the Visual Studio C++ build tools with a Windows SDK.

Make sure cmake, ninja, clang and clang++ are in PATH.

ReXGlue and all required dependencies are already included in the repo.

Run:

`cmake --preset win-amd64-release`
`cmake --build --preset win-amd64-release --parallel`

### Linux

You need CMake 3.25 or newer, Ninja, and Clang with C++23 support.

You'll also need a few system packages for the native UI, input and audio backends. On Debian/Ubuntu:

`sudo apt install libgtk-3-dev libx11-xcb-dev libvulkan-dev libasound2-dev libpulse-dev libpipewire-0.3-dev`

ReXGlue and all required dependencies are already included in the repo.

Run:

`cmake --preset linux-amd64-release`
`cmake --build --preset linux-amd64-release --parallel`

After building, copy librexruntime.so and libTracyClient.so from thirdparty/rexglue-sdk/out/linux-amd64/ into the build output folder (out/build/linux-amd64-release/), next to the saidaioujou_recomp_tu1 executable. They aren't copied there automatically, and the executable won't start without them.

# Patches

The input lag fix (reduction from 3f to 1f) consists of 2 patches:

- The first patch polls the controller again and rebuilds the gameplay input mask right before the game copies it, instead of using the stale mask.
- The second patch runs the game's render callback batch earlier, waits for the buffer swap, and skips the original late calls. This saves another frame.

You can turn them off or on via editing the launch arguments in launch.bat/launch.sh. The arguments are `--render_patch` and `--input_patch`

The patches for both Normal and Arrange modes are in:

- `generated/default/saidaioujou_recomp_tu1_recomp.3.cpp`
- `generated/CA022100/saidaioujou_recomp_tu1_recomp.0.cpp`
- `generated/CA022100/saidaioujou_recomp_tu1_recomp.1.cpp`
- `generated/CA022110/saidaioujou_recomp_tu1_recomp.0.cpp`
- `generated/CA022110/saidaioujou_recomp_tu1_recomp.1.cpp`