View source for Team Fortress 2 engine branch

{{tf2 topicon}}{{src topicon}}
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{{Infobox engine
| image2		 = TF2_Bicubic_lightmap_comparison_-_On.jpg
| imagetooltip2 = In-game screenshot of {{tf2|1}}, running on {{Tf2branch|1}}. This branch adds 64-bit support, VScript support, graphical improvements including bicubic lightmaps (seen here) and radial fog (originally introduced in {{l4dbranch|1}}), and much more features.
| title		 = Team Fortress 2 engine branch
| developer	 = [[Valve Corporation]]
| releasedates	 = circa September 16, 2021 ({{tf2|1}}){{Cite|1}}</br>February 18, 2025 <small>(public SDK & replaces 2013 MP)</small>
| sdk		 = {{srcsdk|1}} ({{code|bin}} folder)</br>{{srcsdk13mp|1|nt=short}} (2025)
| previousengine = {{src13mp|2}} 
}}

{{update|All first party {{src13mp}} games run on this branch now. Update all other pages to mention the {{tf2branch|1}} instead of {{src13mp|1}}, and add new features to this page (if there are any). If something says {{src13mp|only}}, say {{src13mp|since}} instead.}}

<span style="color:white; font-weight:bold"> {{For|about=the engine branch|documentation of Team Fortress 2 tools|[[Team Fortress 2/Docs|Team Fortress 2 - Development Documents]]|}} </span>

The {{tf2branch|4}} (sometimes referred to as '''Source 2013 Multiplayer v2''', '''Source 2025 Multiplayer''', or the '''TF2 branch''' for short) is a newer version of {{src13mp|2}}, developed from updates to {{tf2|2}} (since late 2021). {{hl2dm|1}} was also upgraded to this branch after the 20th Anniversary update. All remaining {{src13mp|1}} games ({{css}}, {{hldms}}, {{dods}} and {{srcsdk13mp|2|nt=0}}) were upgraded to this branch on 18 February 2025, and SDK for this branch was released on the same day.

Currently, this branch, along with {{src13sp|1}}, is the latest Source engine branch available, and actively being maintained.

The branch also adds new features, including ones from {{hl2|1}}'s 20th Anniversary Update (bicubic lightmaps), the {{l4dbranch|1}} (radial fog) and other features from later branches.

Some Source mods and tools that are built on {{src13mp|1}} (sometimes known as '''{{src13mp|name}} Legacy''') will not work on this branch, due to semi-incompatible {{w|Application binary interface|ABI}}s. Nonetheless, the {{tf2branch|nt=0|1}} is still considered a sub-branch of {{src13|2}}, alongside {{src13sp|2}} and the supplanted {{src13mp|2}}.

== Features ==
=== Added ===
New since the {{src13mp|2}} branch is:

; {{w|64-bit|64-bit binaries}} {{also|{{csgo}} for Mac/Linux, {{gmod}}}}
: Allows the game to access more than 4GB RAM and have slightly better performance. Additionally, tools such as {{hammer|1}}, map compilers ({{vbsp|1}}, {{vvis|1}}, {{vrad|1}}), etc. also have 64-bit binaries.
: {{Note|64-bit is not available on Mac.}}
: {{bug|hidetested=1|The 64-bit versions of some tools, such as [[StudioMDL (Source)|StudioMDL]], are broken.}}

; [[VScript]] {{also|{{mapbase}} {{nmrih}} {{l4dbranch}} {{p2branch}} {{csgobranch}} }} <!-- GLua ≠ vscript; don't mention gmod here -->
: A powerful new scripting system primarily using {{sq|2}}. First introduced in April 2024 with {{tf2|1}} update. Third-party games may have different VScript implementation. 

; [[WebM]] video playback (64-bit only) {{also|{{hdtf}} {{gmod}} {{csgo}} {{strata}}}}
: Used for game intros or cutscenes. WebM allows smaller file sizes without significant degradation in video quality. In the Team Fortress 2 engine branch, it is only used in 64-bit mode, as 32-bit still use [[Bink]] & plays Bink video.
: {{Note|Not used in games like {{hl2dm|1}}, {{css|1}}, {{dods|1}} and {{hldms|1}}, which continues to use Bink, but only when launched with 32-bit executable. 64-bit versions of the game fails to play Valve intro because it uses WebM, and {{code|valve.webm}} isn't present in {{code|hl2\media}} folder.}}

; [[Vulkan]] renderer {{also|{{hl2}} {{portal}} {{l4d2}} {{p2branch}} {{csgobranch}} {{strata}} {{xe}}}}
: A low-overhead, cross-platform graphics API, successor to [[OpenGL]]. 
: First introduced in 2022 with the release of Steam Deck update for {{hl2|1}} and {{portal|1}}, and later added to {{tf2|1}} during the 64-bit update. As all Valve games running on {{src13mp|1}} branch upgraded to TF2 branch, those games (such as {{css|2}}) now support Vulkan. This is disabled by default (on Windows), but can be enabled in supported games by passing {{code|-vulkan}} into the game's launch options. Vulkan is enabled by default on Linux.

; [[VGUI]] High {{w|Dots per inch|DPI}} support {{also|{{hl2}} 20th}}
: VGUI elements are now properly scalable on higher resolutions such as 4K (3840x2160).

; [https://partner.steamgames.com/doc/features/multiplayer/networking Steam Networking] {{also|{{synergy}}}}
: Allows self-hosting using [https://partner.steamgames.com/doc/features/multiplayer/steamdatagramrelay Steam Datagram Relay], meaning users can easily create joinable servers without port forwarding.
: {{Important|Enabled by default. If you are currently working on mapping for games that have Steam Networking enabled, make sure {{code|sv_use_steam_networking}} is set to {{code|0}} (disabled), to prevent users from easily joining your server.}}

; {{w|Bicubic}} lightmap filtering {{also|{{hl2}} 20th {{hls}}}}
: Introduced in Half-Life 2 20th Anniversary Update (2024), bicubic filtering is used on [[lightmap]]s when {{cmd|r_lightmap_bicubic}} is enabled, smoothing out aliasing caused by the lower resolution of lightmaps. It can be also enabled by setting the Shader detail to "Very High".

; [[Env_fog_controller#Radial_fog|Radial fog]] {{also|{{mapbase}} {{l4dbranch}} {{asbranch}} {{p2branch}} {{csgobranch}} {{strata}} {{hl2}} 20th}}
: Unlike planar-based fog, radial fog does not strengthen or weaken the apparent amount of fog in a particular spot when you rotate the camera. It is first introduced in {{l4dbranch|1}}. 
: You can either use radial fog or planar-based fog by changing {{ent|env_fog_controller}} "Use Radial Fog {{mono|(fogRadial)}}" KeyValues.

; Texture streaming {{also|{{csgobranch}}{{tfbranch}}}}
: Reduces system RAM and graphics card VRAM usage by streaming textures as needed instead of loading them all when loading the map.

; [[$treeSway|Swaying trees]] {{also|{{gmod}} {{mapbase}} {{l4dbranch}} {{asbranch}} {{p2branch}} {{csgobranch}} {{strata}} {{xe}}}}
: Introduced in {{tf2}}'s Jungle Inferno update. A material parameter that gives the effect of trees swaying in the wind.

; Updated shader compilation tools
: Now by default SCell555's shader compiler is included in the SDK.

=== Changed / Fixes ===
; Removed options to disable/enable Direct3D 9Ex (Windows Aero [[DirectX]] extensions) in Advanced Video Options.
: While the option has been removed, likely because it does nothing when trying to disable it through in-game options/settings (possibly broken since {{win10|1|nt=Win10}}), disabling D3D9Ex through {{code|-nod3d9ex}} still works.
; Numerous security fixes
: See [https://github.com/ValveSoftware/source-sdk-2013/issues/562 GitHub post].
; Fixed [[Cubemaps#Building_cubemaps|building cubemaps]]
: Building cubemaps on this branch no longer requires deleting pre-built (blank) cubemap, and building cubemaps doesn't need cheats to be enabled. However, you still needs to follow some of the steps correctly to make sure you built cubemaps on both LDR & HDR rendering and having consistent exposure/brightness on HDR cubemaps.

=== Removed ===
; Miles Sound System middleware
: Uses open-source {{github|misyltoad/VAudio-MiniMP3|minimp3}} for [[MP3]] playback instead. Files related to Miles Sound System will remain on the game's {{path|bin}} folder (contains 32-bit DLLs), but left unused.
; {{mac|4|nt=macos}} ({{mac|3|nt=osx}}) support
: Support for Mac was deprecated with {{tf2|1}} update back in 2024 (and applies to all other Source games), due to Mac previously dropping support for 32-bit applications back in 2019, and Valve does not plan to release native 64-bit Mac port.

== Known issues / Report bugs ==
To report bugs or find existing issues on this engine branch, see [https://github.com/ValveSoftware/Source-1-Games/issues Source games] and [https://github.com/ValveSoftware/source-sdk-2013/issues/ Source SDK 2013 repo] GitHub issues page in order to prevent duplicate or outdated bug reports at the wiki.

== Availability and usage ==
Source code (game, tools) for this branch is available on [https://github.com/ValveSoftware/source-sdk-2013/tree/master GitHub].

To launch tools for these games, go to {{path|bin}} folder (for 32-bit binaries), or {{path|bin\x64}} folder (for 64-bit binaries).
==== Valve ====
* {{Code|2004}} {{css|2}} (formerly {{src13mp}}, {{srcmp}}*, {{src06}}, {{src04}})
* {{Code|2004}} {{hl2dm|2}} (formerly {{src13mp}}, {{srcmp}}*, {{src06}}, {{src04}})
* {{Code|2005}} {{hldms|2}} (formerly {{src13mp}}, {{src06}}, {{src04}})
* {{Code|2005}} {{dods|2}} (formerly {{src13mp}}, {{srcmp}}*, {{src07}}, {{src06}}, {{src04}})
* {{Code|2007}} {{tf2|2}} (formerly {{src13mp}}, {{srcmp}}*, {{src07}})
* {{Code|2014}} {{srcsdk13mp|4.1}} (formerly {{src13mp}}; {{Steam|launch/243750|Click to Install}})
:: {{Note|Mods built on {{src13mp|2|nt=0}} prior to the upgrade to the {{Tf2branch|1}} may not work properly if the mod is launched with updated SDK Base 2013 MP, so if you want to use legacy version of {{src13mp|1|nt=0}} to play older mods (or use older tools), follow the instructions:
::# Open Steam, go to '''Source SDK 2013 Multiplayer''', right click Properties
::# A window will open. Go to "Betas", select {{Code|previous2021}} beta branch.
::# Steam will automatically re-download the files. Once it's done, run Source SDK Base 2013 MP as normal, or use it's tools.
}}
{{Note|* - Before {{src09|1}} was split to create {{srcmp|1}} branch, those games used to run on {{src09|1}}, before [[Source SDK release notes archive#Source_SDK_(10/19/2011)|SDK Update in 10/19/2011]] changed TF2, DOD:S and CS:S to use Source MP configuration. The Source 2009 and MP are mostly similar except MP branches received more frequent updates.}}

==== Third-Party ====
* {{code|2009}} {{NT|2}} (as ''Neotokyo; Rebuild'', currently in alpha)
* {{code|2014}} {{Tf2c|2}} - ''Steam version - coming soon.''

{{references|1=
{{ref2|cite id=1|[https://wiki.alliedmods.net/Required_Versions_(SourceMod) Required Versions (SourceMod)]
According to {{sourcemod|2}} website, TF2 was updated on Sep 16, 2021, which fixes exploits relating to impersonating other Steam accounts, new launch options ({{code|-enablefakeip}}), and more. This however breaks SourceMod plugin, requiring rewriting the plugin to add support for newer versions of TF2.</br>The remaining Source 2013 MP games ({{css}}, {{dods}}, {{hldms}} and {{hl2dm}}), and 2013 MP SDK (except the code) was last updated in July 2021 and never receive any new updates again until Feb 18, 2025. {{Hammerpp|1}} (released in 2022) also has a version made specific for TF2.}}
}}

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