The Multiverse of Liberty, Vice, and San Andreas: A Technical Marvel in Modding History

The Grand Theft Auto (GTA) franchise has long served as a sandbox for the most creative minds in the modding community. From total conversion mods that turn Los Santos into a post-apocalyptic wasteland to graphical overhauls that bring 20-year-old titles into the modern era, the community has seen it all. However, a new project by a developer known as Dryxio has shattered the ceiling of what was previously considered possible. By integrating GTA III, GTA Vice City, and GTA San Andreas into a single, interconnected multiversal entity, Dryxio has created a mod that functions as a seamless bridge between three distinct game engines.

This isn’t merely a visual trick or a video-based overlay; it is a profound technical achievement that utilizes real-time portals to facilitate instant, zero-load-time travel between these iconic 3D-era classics.

The Genesis of a Multiverse: Main Facts and Functionality

At the heart of Dryxio’s project is the ability to place fully functional, interactive portals anywhere within the game world. When a player stands in the sun-drenched streets of Vice City and looks through a portal, they are not seeing a static texture or a pre-rendered video. They are seeing an active, live feed of San Andreas or GTA III.

If a player fires a weapon into the portal, the projectiles traverse the "void" and interact with the NPCs and environment on the other side. This level of synchronization suggests that all three games are running simultaneously within a single process. By sharing a Direct3D device, Dryxio has managed to orchestrate a performance where three distinct, memory-heavy game engines operate in tandem, with the GPU rendering the "view" of the target game onto a surface within the active game.

The most striking aspect of this integration is the transition. Players can walk through these portals and find themselves instantly transported from the gritty, urban sprawl of Liberty City to the neon-lit avenues of Vice City without a single loading screen. This fluidity challenges the long-held assumption that the proprietary RenderWare engine—which powered these games in the early 2000s—was incapable of such multi-scene rendering.

A Chronology of the 3D-Era Technical Renaissance

To understand how this mod came to exist, one must look at the long-term efforts of the open-source modding community. For years, the original source code of these titles remained locked behind Rockstar Games’ proprietary walls. However, dedicated reverse-engineering projects eventually bore fruit.

• The Foundation (2018–2021): The re3 and reVC projects were pivotal. These community-led initiatives successfully decompiled the original source code of GTA III and Vice City, translating the assembly language into clean, readable C++ code. This allowed modders to recompile these games, effectively giving them the "keys to the kingdom" to modify the core engine.
• The Bridge (2022–2023): While re3 and reVC provided the framework for the first two 3D games, GTA San Andreas remained more elusive due to its complexity. Developers utilized the plugin-sdk to interface with San Andreas, creating a layer that allowed modern code to interact with the original binary.
• The Unification (2024): Dryxio’s breakthrough came through the implementation of librw. This open-source reimplementation of the RenderWare graphics engine was the "glue" that held the three games together. By replacing the native, closed-source rendering libraries with librw, the developer was able to force all three games to run in a unified, multi-process environment that shares the same GPU memory space.

Technical Deep-Dive: How the Portal Works

The technical brilliance of the mod lies in how it bypasses the limitations of the original RenderWare engine. In a standard setup, each of these games expects to be the sole occupant of the GPU. They initialize, allocate memory, and manage the Z-buffer (depth perception) as if they are the only reality the computer knows.

Dryxio’s mod introduces a "manager" layer. This layer acts as a conductor, orchestrating the state of the three games. When a portal is active:

1. Rendering Sync: The game that is not currently being controlled by the player continues to run in the background. It maintains its own AI loops, physics calculations, and traffic patterns.
2. GPU Texture Mapping: The engine captures the output of the background game’s "camera" and maps it onto a geometry surface (the portal) in the foreground game.
3. Engine Swapping: The transition is a masterclass in memory management. As the player crosses the threshold, the mod performs an instant "engine swap," where the player’s controls are handed off to the engine of the destination game, while the previously active engine enters the "background" state.

Because the games share the same hardware device, the transition happens at the frame-buffer level, resulting in the instantaneous, seamless experience seen in the demonstration videos.

The Elephant in the Room: Official Responses and Legalities

While the modding community has hailed this as a triumph of ingenuity, there is a looming shadow over the project: Rockstar Games. The company, a subsidiary of Take-Two Interactive, has a notoriously complex relationship with modders. In the past, they have supported high-quality fan projects, but they have also issued aggressive takedown notices against projects that they feel infringe upon their intellectual property or threaten their commercial interests.

Historically, Rockstar has been particularly protective of the "Definitive Edition" of the 3D trilogy. The existence of a fan-made, technically superior, and highly experimental mod that unites the games might be viewed as a critique of the official remasters. Furthermore, because this mod utilizes reverse-engineered source code, it exists in a legal gray area. While the mod doesn’t distribute the game assets (players must provide their own legally owned copies), the use of decompiled source code can be a point of contention for corporate legal departments.

For now, the project remains in a "proof of concept" stage and has not been released to the public. This serves as a strategic buffer, allowing the creator to showcase the innovation without immediately triggering a cease-and-desist order.

Broader Implications for the Future of Modding

Dryxio’s work represents a shift in the philosophy of game modding. We are moving beyond simple texture swaps or mission scripts and entering an era of "engine-level" modifications. This suggests a future where the constraints of old hardware are no longer barriers to the creative imagination of developers.

If these games can be interconnected via portals, the implications for modding are endless:

• The "GTA Universe" Mod: We could eventually see a single, unified map where the cities of Liberty City, Vice City, and Los Santos exist on the same coordinate plane, with high-speed travel between them becoming a standard feature of a massive, player-built "GTA World."
• Inter-Engine Compatibility: This project proves that different games using the same base engine can be forced to cooperate. This could pave the way for cross-game asset sharing, where vehicles, weapons, and characters from one era are seamlessly imported into another.
• Preservation and Modernization: By using open-source engines like librw, the community is effectively future-proofing these classics. Even if Rockstar stops supporting the titles on modern operating systems, the community-led open-source engines ensure that these games will remain playable for decades to come.

Conclusion: A Testament to Human Ingenuity

The "Portal Mod" is more than just a novelty; it is a milestone. It stands as a testament to what is possible when passion meets technical literacy. In an age where triple-A development is increasingly opaque and locked down, projects like this remind us that the spirit of open-source development is alive and well.

Whether or not the mod ever reaches a public release, it has already achieved its primary goal: it has changed the conversation. It has proven that even twenty-year-old software, when treated with enough curiosity and technical skill, can be transformed into something entirely new. For the Grand Theft Auto community, the multiverse is no longer a dream—it is a working, breathing, and fully operational reality. As we wait to see how Rockstar responds, one thing remains certain: the modding community has once again proven that they are the true keepers of the Grand Theft Auto legacy.