Team Fortress 2 engine branch
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The 
Team Fortress 2 branch is a newer version of 
Source 2013 Multiplayer, developed from updates to 
Team Fortress 2. Half-Life 2: Deathmatch was also upgraded to this branch after the 20th Anniversary update. Valve is currently working on upgrading all remaining Source 2013 Multiplayer games (
, 
, 
and SDK) to this branch.
The branches have incompatible 
ABIs, i.e. mods/tools compiled for will not work under without updating interfaces.
Features
New since the Source 2013 Multiplayer branch is:
- Swaying trees (also in
) - Introduced in Jungle Inferno update. A material parameter that gives the effect of trees swaying in the wind.
- 64-bit binaries (also in )
- Allows the game to access more than 4GB RAM and have slightly better performance. Additionally, tools such as Hammer, map compilers (VBSP, VVIS, VRAD), etc... also have 64-bit binaries.
Note: 64-bit is not available on Mac.
Half-Life 2 was the first game to receive 64-bit update back in 2005, when it ran on Source 2004. It was later removed for unknown reasons, but it also had some technical issues at the time.
only has 64-bit binaries for the engine DLLs; all executables and game DLLs are still 32-bit.
- VScript (also in
) - A powerful new scripting system primarily using
Squirrel. Third-party games may have different VScript implementation.
- WebM video playback (also in
) - Used for game intros or cutscenes in some games. Replaces Bink video. WebM allows smaller file sizes without significant degradation in video quality.
- Vulkan renderer (also in
) - A low-overhead, cross-platform graphics API, successor to OpenGL.
- First introduced in 2022 with the release of Steam Deck update for Half-Life 2 and Portal, and later added to Team Fortress 2 during the 64-bit update. Portal with RTX also uses Vulkan as part of the RTX Remix runtime. Using DXVK, a library used to translate Direct3D calls to Vulkan. This is disabled by default, but can be enabled in supported games by passing
-vulkaninto the game's launch options.
- VGUI High DPI support (also in 20th)
- VGUI elements are now properly scalable on higher resolutions such as 4K (3840x2160).
- Texture streaming (also in
) - Reduces system RAM and graphics card VRAM usage by streaming textures as needed instead of loading them all when loading the map.
- Numerous security fixes
- See GitHub post.
Availability
Game code for this branch is not available.
| Release date | Title |
|---|---|
| 2004 | Half-Life 2: Deathmatch (formerly ,  ,  ,  ) |
| 2007 | Team Fortress 2 (formerly , ,  ) |
