We're back with another update. This time around, we focused heavily on squashing some of the most annoying client bugs, expanding language support, and dropping a very cool new tool for our scripters.

Here is what’s new:

🛠️ For Scripters: The New Gizmo API​

We’ve added a brand-new Gizmo API to the scripting engine. For the tech-savvy among you: this is powered by ImGui (specifically the ImGuizmo library). This should make working, building, and debugging in 3D space a whole lot easier for you.

Check out this quick showcase to see the new Gizmo API in action:

🖥️ No More Alt-Tab Nightmares & Resolution Fixes​

We tackled some of the most frustrating window crashes. You can finally Alt-Tab safely without getting stuck on a black screen or crashing the game!

On top of that, we fixed the crashes that happened when changing your resolution in the graphics settings, and stopped the game window from forcing itself into full resolution.

🌍 WebUI IME Support​

Our WebUI now natively supports IME input, meaning players can now properly type in Chinese, Japanese, and Korean!

⏳ Game Start Overlay​

If your game ever takes a little longer to start up than usual (which is usually caused by Windows Defender or other Anti-Virus software scanning the files), we’ve added a helpful new overlay. Now you'll know exactly what's going on and won't be left wondering if your game just froze.

🔧 Under the Hood & QoL​

As always, we tweaked some things in the background to keep everything running smoothly:

• HUD Improvements: The FPS counter and the watermark rendering look much cleaner now.
• Scripting Fixes: We improved native invocation code and fixed an annoying crash related to thread destruction.
• WebUI & Engine: Fixed textures not recreating after a D3D reset, improved IPC code, and added more network session logs to help with debugging.

❤️ Donations​

Lastly, we want to extend a heartfelt thank you to the following community members who supported this project financially this year:

• Dimmi
• marjo
• SlurTK
• dkc
• Sprinkles
• S.M.R
• Waluta
• Soul
• jack

📋 Full Changelog​

• game: fix crash when changing resolution in graphic settings
• game: fix black screen or crash after alt-tab
• game: fix game window being forced to full resolution
• game: add more network session logs
• hud: improve watermark rendering
• hud: improve fps counter
• imgui: render code improvements
• webui: recreate texture at d3d reset
• webui: support ime (chinese, japanese, korean)
• webui: ipc code improvements
• helper: code improvements
• helper: show overlay if game start is taking longer than usual
• scripting: add gizmo api
• scripting: native invocation code improvements
• scripting: fix crash related to thread destruction

Have a nice day. See you next time!

Here’s the quick rundown of what’s new:

⚙️ Expanded API, Threads & Gear Natives​

We’ve expanded the scripting API, including specific community requests like the new Timer API and the new Thread functions. You can now run threads inside threads and easily manage them using IDs, Thread.Kill(), and Thread.IsAlive().

We also added brand-new transmission natives. You now have full control over vehicle gears, from setting the highest gear to tweaking the Gear Ratio. Check out this quick showcase to see them in action:

🚀 Launcher Glow-Up & Addon Crash Fix​

The launcher got some much-needed love. It’s finally freely resizable, automatically fits your monitor size, and just looks a lot cleaner.

Also, big news for servers with massive car packs: we fixed the crash that happened when adding too many addon cars. Go crazy with your vehicle mods!

💻 More Natives & Under the Hood​

We also squeezed in some neat backend stuff and performance boosts:

• More Natives: Aside from gears, you can now mute sirens (SET_VEHICLE_HAS_MUTED_SIRENS), disable radar zooming, and block replay saving.
• Performance: We updated FusionFix to v5.0.1, optimized network syncing (no more memory leaks!), and bumped all our background libraries (CEF, SQLite, WebView2) to their latest versions to keep things buttery smooth.

❤️ Donations​

Lastly, we want to extend a heartfelt thank you to the following community members who supported this project financially this year:

• Dimmi
• marjo
• SlurTK
• dkc
• Sprinkles
• S.M.R
• Waluta
• Soul
• jack

📋 Full Changelog​

• fusionfix: update to v5.0.1
• game: add native SET_VEHICLE_HAS_MUTED_SIRENS
• game: add native SET_VEHICLE_GEAR
• game: add native SET_VEHICLE_HIGH_GEAR
• game: add native GET_VEHICLE_HIGH_GEAR
• game: add native SET_VEHICLE_GEAR_RATIO
• game: add native GET_VEHICLE_GEAR_RATIO
• game: add native DISABLE_ZOOM_RADAR
• game: add native DISABLE_REPLAY_SAVE
• addon: fix crash when many cars got added
• launcher: window is now resizable
• launcher: prettier window borders
• launcher: window size now adjusts to the monitor size
• launcher: fix server name scroll text respect larger resolutions
• launcher: updated WebView2 to 1.0.4022.49
• network: optimize serialization performance
• network: fix possible memory leak
• scripting: add Timer API
• scripting: allow to create thread inside thread
• scripting: Thread.Create returns now an id
• scripting: add Thread.Kill() function
• scripting: add Thread.IsAlive() function
• scripting: add WebUI.IsReady() function
• scripting: vm code improvements
• server: update SQLite to 3.53.2
• webui: update cef to 149.0.4
• shared: update libraries

Have a nice day. See you next time!

Addons​

Ever since the first HappinessMP release, the community has been asking for a way to bring custom vehicles, peds, objects, and weapons into the game server‑side. Addons finally make that possible. You can learn more about them here.

Launcher Redesign​

The launcher has also gotten some love in this update. We’ve refreshed the design with a brighter look and added customization features like background selection and adjustable accent colors.

On top of that, the launcher now includes several code improvements, bug fixes, and new features — for example, pre‑downloading resource files. You’ll find all the details in the changelog.

Donations​

Lastly, we want to extend a heartfelt thank you to the following community members who supported this project financially this year:

• SlurTK
• Sprinkles
• S.M.R
• Soul
• jack

Full Changelog​

• feature: server addons
• launcher: new design
• launcher: pre-download resources
• launcher: fix update freezes
• launcher: updates are now cancelable
• launcher: improve masterlist fetching
• launcher: more information at connection errors
• launcher: crash reports now have a user input field
• launcher: updated WebView2 to 1.0.3800.47
• launcher: many code improvements
• server: download size calculation
• server: remove leftover gamemode setting
• server: update MySQL Connector to 9.6.0
• server: update SQLite to 3.51.2
• scripting: update lua to 5.5
• webui: update cef to 145.0.27
• game/net: more reliable session joining
• shared: update vendors

Have a nice day. See you next time!

Linux Server​

We are thrilled to announce the long-awaited release of the Linux version of our server with this update. This addition is a game-changer for many users, as Linux hosting is typically much more cost-effective than Windows hosting.

Client Developer Tools​

This update introduces the first set of client-side developer tools. Among them is the terminal, a console that displays errors and script outputs, and the resource monitor, which allows you to track the average frame time of resources and the current memory usage of the VM. These tools were requested by the community, and we plan to expand on them in the future, including deeper integration with the terminal.

Discord Rich Presence​

Another community-driven addition is Discord Rich Presence, now made possible through the integration of the Discord Game SDK. This update enriches the multiplayer experience, and we�re already exploring ways to expand the features and interactions provided by the SDK in the future.

Donations​

Lastly, we want to extend a heartfelt thank you to the following community members who supported this project financially last month:

• marjo
• dkc
• LeChapellierFou

Full Changelog​

• game: add discord rich presence
• game: fix dangling pointer
• gui: add terminal and resource monitor (F1 key)
• scripting: refactor resource events
• server: add linux support
• shared: update libraries

Have a nice day. See you next time!

New network concept​

With this update I have implemented a new multithreading based networking concept with one main goal: performance. Both transmission and processing of network packets is now much faster and packet loss is practically zero. I hope this solves known problems such as the frequent failure to join a session.

FusionFix Support​

Many people have asked for this, and now I can at least offer a solution, albeit not a perfect one. We now offer an alternative version of FusionFix that is compatible with HappinessMP. Unfortunately, due to the way HappinessMP works, this is technically the only option.

Download: https://happinessmp.net/files/GTAIV.EFLC.FusionFix.HappinessMP.zip
Source: https://github.com/HappinessMP/GTAIV.EFLC.FusionFix

Full Changelog​

• new network concept
• support for alternative fusionfix version
• set dpi awareness for launcher to fix scaling issues
• allow safe lua os library functions
• add more network stats (F4 key)
• fix natives with vector3 arg
• fix server console colors
• update vendors

Have a nice day. See you next time!

Docs​

In the last days I tried to document all functions and events with corresponding examples for both scripting languages we offer (Lua/Squirrel). Of course the docs will be extended in the future.

I hope this and the example gamemode included in the server files will help you to develop your own gamemode.

Terms of Service​

I would also like to draw your attention to our new Terms of Service, which you agree to by using the HappinessMP client and server.

This is to define fair conditions for the use of my free software.

Future features​

Of course the list of features planned for the future, like voice chat or streaming, is long. I try to implement as many of them as possible, but you have to keep in mind that I am alone and have a full-time job.

That's why the order in which I work on a feature in the future is mainly based on necessity. For example, if someone has finished a complete RP game mode and needs a voice chat, I will focus my work on that.

I thank everyone who has read this far and hope to see many new servers in the future.

Have a nice day. See you next time!

I recall starting with the launcher, and with the passage of time and expanding skills, a decision was made to give it a full rewrite and the core a significant refactoring.

New Launcher​

Same design, new focus. While the old launcher prioritized neat organization and offering as much as possible, the new focus is on simplicity, effectiveness, and user-friendliness. For example, the server list is now the first thing visible upon launching, eliminating annoying page changes.

Moreover, the new launcher is now based on Webview2 instead of CEF, ensuring better performance, improved compatibility with modern web standards, and seamless updates through Microsoft Edge.

An added feature is the built-in installer, designed primarily to assist first-time users in playing HappinessMP. The installer guides users through all necessary steps for installation, providing active feedback, for instance, when selecting the installation directory.

New Update Policy​

Unlike before, where updates and a connection to HappinessMP servers were mandatory, I aim to give full control back to the user. Consequently, an internet connection is only necessary for installation (due to file downloads). Once installed, HappinessMP can be used offline on the LAN.

While updates will still be suggested at startup, they can now be skipped. To prevent compatibility issues between different client and server versions, a new version system is introduced to check compatibility upon joining.

New Project Goals​

Considering the extended development time in relation to actual progress, I've decided to adjust project goals downward. This means that some planned features, including the much-requested 'Rockstar Modes', will be dropped.

Regrettably, this decision was necessary to bring the project to a reasonably 'finished' state, given my limited time.

Have a great day. See you next time!