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## Intro

In this repository you'll find the fully reversed source code for GTA III ([master](tree/master) branch) and GTA VC ([miami](tree/miami) branch).

It has been tested and works on Windows, Linux and FreeBSD, on x86, amd64, arm and arm64.\
Rendering is handled either by original RenderWare (D3D8)
or the reimplementation [librw](https://github.com/aap/librw) (D3D9, OpenGL 2.1 or above, OpenGL ES 2.0 or above).\
Audio is done with MSS (using dlls from original GTA) or OpenAL.

The project has also been ported to the [Nintendo Switch](https://github.com/AGraber/re3-nx/),
[Playstation Vita](https://github.com/Rinnegatamante/re3) and
[Nintendo Wii U](https://github.com/GaryOderNichts/re3-wiiu/).

We cannot build for PS2 or Xbox yet. If you're interested in doing so, get in touch with us.

## Installation

- re3 requires PC game assets to work, so you **must** own [a copy of GTA III](https://store.steampowered.com/app/12100/Grand_Theft_Auto_III/).
- Build re3 or download the latest nightly build:
  - [Windows D3D9 MSS 32bit](https://nightly.link/GTAmodding/re3/workflows/re3_msvc_x86/master/re3_Release_win-x86-librw_d3d9-mss.zip)
  - [Windows D3D9 64bit](https://nightly.link/GTAmodding/re3/workflows/re3_msvc_amd64/master/re3_Release_win-amd64-librw_d3d9-oal.zip)
  - [Windows OpenGL 64bit](https://nightly.link/GTAmodding/re3/workflows/re3_msvc_amd64/master/re3_Release_win-amd64-librw_gl3_glfw-oal.zip)
  - [Linux 64bit](https://nightly.link/GTAmodding/re3/workflows/build-cmake-conan/master/ubuntu-latest-gl3.zip)
  - [MacOS 64bit](https://nightly.link/GTAmodding/re3/workflows/build-cmake-conan/master/macos-latest-gl3.zip)
- Copy the files from the `gamefiles` directory to your game root directory. (This is not strictly necessary but very much recommended)
- Move re3 executable to GTA 3 directory and run it.

## Screenshots

![re3 2021-02-11 22-57-03-23](https://user-images.githubusercontent.com/1521437/107704085-fbdabd00-6cbc-11eb-8406-8951a80ccb16.png)
![re3 2021-02-11 22-43-44-98](https://user-images.githubusercontent.com/1521437/107703339-cbdeea00-6cbb-11eb-8f0b-07daa105d470.png)
![re3 2021-02-11 22-46-33-76](https://user-images.githubusercontent.com/1521437/107703343-cd101700-6cbb-11eb-9ccd-012cb90524b7.png)
![re3 2021-02-11 22-50-29-54](https://user-images.githubusercontent.com/1521437/107703348-d00b0780-6cbb-11eb-8afd-054249c2b95e.png)

## Improvements

We have implemented a number of changes and improvements to the original game.
They can be configured in `core/config.h`.
Some of them can be toggled at runtime, some cannot.

* Fixed a lot of smaller and bigger bugs
* User files (saves and settings) stored in GTA root directory
* Settings stored in re3.ini file instead of gta3.set
* Debug menu to do and change various things (Ctrl-M to open)
* Debug camera (Ctrl-B to toggle)
* Rotatable camera
* Xinput controller support (Windows)
* No loading screens between islands ("map memory usage" in menu)
* Skinned ped support (models from Xbox or Mobile)
* Rendering
  * Widescreen support (properly scaled HUD, Menu and FOV)
  * PS2 MatFX (vehicle reflections)
  * PS2 alpha test (better rendering of transparency)
  * PS2 particles
  * Xbox vehicle rendering
  * Xbox world lightmap rendering (needs Xbox map)
  * Xbox ped rim light
  * Xbox screen rain droplets
  * More customizable colourfilter
* Menu
  * Map
  * More options
  * Controller configuration menu
  * ...
* Can load DFFs and TXDs from other platforms, possibly with a performance penalty
* ...

## To-Do

The following things would be nice to have/do:

* Fix physics for high FPS
* Compare code with PS2 code (tedious, no good decompiler)
* [PS2 port](https://github.com/GTAmodding/re3/wiki/PS2-port)
* Xbox port (not quite as important)
* reverse remaining unused/debug functions
* compare Codewarrior build with original binary for more accurate code (very tedious)

## Modding

Asset modifications (models, texture, handling, script, ...) should work the same way as with original GTA for the most part.

Mods that make changes to the code (dll/asi, CLEO, limit adjusters) will *not* work.
Some things these mods do are already implemented in re3 (much of SkyGFX, GInput, SilentPatch, Widescreen fix),
others can easily be achieved (increasing limis, see `config.h`),
others will simply have to be rewritten and integrated into the code directly.
Sorry for the inconvenience.

## Building from Source  

When using premake, you may want to point GTA_III_RE_DIR environment variable to GTA3 root folder, if you want executable to be moved there via post-build script.

<details><summary>Linux Premake</summary>

For Linux using premake, proceed: [Building on Linux](https://github.com/GTAmodding/re3/wiki/Building-on-Linux)

</details>

<details><summary>Linux Conan</summary>

Obtain source code.
```
git clone https://github.com/GTAmodding/re3.git
cd re3
git submodule init
git submodule update --recursive
```
Install python and conan, and then run build.
```
conan export vendor/librw librw/master@
mkdir build
cd build
conan install .. re3/master@ -if build -o re3:audio=openal -o librw:platform=gl3 -o librw:gl3_gfxlib=glfw --build missing -s re3:build_type=RelWithDebInfo -s librw:build_type=RelWithDebInfo
conan build .. -if build -bf build -pf package
```
</details>

<details><summary>FreeBSD</summary>

For FreeBSD using premake, proceed: [Building on FreeBSD](https://github.com/GTAmodding/re3/wiki/Building-on-FreeBSD)

</details>

<details><summary>Windows</summary>

Assuming you have Visual Studio:
- Clone the repo using the argument `--recursive`.
- Run one of the `premake-vsXXXX.cmd` variants on root folder.
- Open the project via Visual Studio  
    
**If you use 64-bit D3D9**: We don't ship 64-bit Dx9 SDK. You need to download it from Microsoft if you don't have it(although it should come pre-installed after some Windows version)  

**If you choose OpenAL on Windows** You must read [Running OpenAL build on Windows](https://github.com/GTAmodding/re3/wiki/Running-OpenAL-build-on-Windows).
</details>

> :information_source: There are various settings in [config.h](https://github.com/GTAmodding/re3/tree/master/src/core/config.h), you may want to take a look there. i.e. FIX_BUGS define fixes the bugs we've come across.

> :information_source: **Did you notice librw?** re3 uses completely homebrew RenderWare-replacement rendering engine; [librw](https://github.com/aap/librw/). librw comes as submodule of re3, but you also can use LIBRW enviorenment variable to specify path to your own librw.

## Contributing
We have a [Coding Style](https://github.com/GTAmodding/re3/blob/master/CODING_STYLE.md) document that isn't followed or enforced very well.

Do not use features from C++11 or later.


## License

We don't feel like we're in a position to give this code a license.
If we were, it would be MIT licensed.
