View source for Source SDK Base 2013

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{{src13}} {{srcsdk13sp|3}} and {{srcsdk13mp|3}} are tools available to all Steam users which, as the name implies, is locked to {{src13|1}} engine branch, to prevent incompatible engine updates from making your mod unusable. Since Source 2013 was split into three sub-branches (originally two), there are {{srcsdk13sp|name}} (for singleplayer mods) and {{srcsdk13mp|name}} (for multiplayer mods).

{{tip|Despite the names, '''both {{srcsdk13sp|1}} and {{srcsdk13mp|1}} ({{src13mp}} only) can be used for singleplayer'''.<br>The Multiplayer branch provides additional features ([[$lightmap|static prop lightmaps]], [[BSPZIP|BSP compression]], more [[ambient cube]]s per [[visleaf]], and slightly newer code), which may be desirable over the Singleplayer branch if not using a base mod such as {{mapbase|3.1}} and not making a single-player mod that does not modify game code.<br>
{{tf2branch|2|nt=0}} version of {{srcsdk13mp|1}} makes some changes which break singleplayer mode, such as save loading not working correctly[https://github.com/ValveSoftware/source-sdk-2013/issues/629] and attempting to load any map with {{cmd|maxplayers}} (singleplayer) and {{cmd|cl_localnetworkbackdoor}} both set to {{code|1}} will also crash the game[https://github.com/ValveSoftware/source-sdk-2013/issues/610] (not affected on "sourcetest" (Source Engine Test).}}
== SDK Base versions ==
There are two versions of Source SDK Base(s) 2013:
* {{src13mp|2|nt=sdk}} (AppID: {{code|243750}} - {{Steam|launch/243750|Click to Install}})
:{{Note|This branch originally runs on {{src13mp|1}}, but it has been upgraded to {{Tf2branch|2}}, which might be incompatible with mods built on legacy version of {{src13mp|1}} (that runs on {{src13mp|1}}).<!--
--></br>To downgrade to legacy version of Source SDK Base 2013 Multiplayer, 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.
}}
* {{src13sp|2|nt=sdk}} (AppID: {{code|243730}} - {{Steam|launch/243730|Click to Install}})
:{{Note|By default, many {{code|[[Mods|sourcemods]]}} (including {{Mapbase|4}}), will crash when launched, unless you select the {{code|upcoming}} branch.<!--
--></br>To select {{code|upcoming}} branch, follow the instructions:
::# Open Steam, go to '''Source SDK 2013 Singleplayer''', right click Properties
::# A window will open. Go to "Betas", select {{Code|upcoming}} beta branch.
::# Steam will automatically re-download the files. Once it's done, try to launch the mod again.
}}
: {{Note|Currently, as of March 4, 2025, this branch hasn't been updated yet to received new features from {{hl2|1}} 20th Anniversary Update (radial fog, classic particles, etc.) or {{tf2branch|1}}.}}
== Setting up & compiling code ==
To set up Source SDK 2013 and compiling mods, see:
* [[Setting up Source SDK Base 2013 Multiplayer|Setting up Source SDK Base 2013 Multiplayer]] - for {{tf2branch|2}} (using post-2025 {{src13mp|1|nt=sdk}})
* [[Setting up Source SDK Base 2013 Singleplayer|Setting up Source SDK Base 2013 Singleplayer]] - for {{src13sp|2}} (using {{src13sp|1|nt=sdk}})
** Source code for this SDK is not yet updated, unlike TF2 branch, and will require using older version of Visual Studio or GCC to compile.
** Also applies to legacy (pre-2025) version of {{src13mp|1|nt=sdk}}.

== SDK Base Content ==
=== Singleplayer branch ===
* Source Engine Test (<code>sourcetest</code>)
* {{hl2ep2|1}} shared (<code>ep2</code>)
* {{hl2ep1|1}} shared (<code>episodic</code>)
* {{hl2|1}} shared (<code>hl2</code>)
* {{src13sp|1}} branch (32-bit binaries only)
=== Multiplayer branch ===
* Source Engine Test (<code>sourcetest</code>)
** {{Note|Source Engine Test can be only launched with 32-bit binaries only.}}
* {{hl2dm|1}} shared (<code>hl2mp</code>)
* {{hl2|1}} Complete (<code>hl2_complete</code>)
* {{hl2|1}} shared (<code>hl2</code>)
* {{tf2branch|1}} (32/64-bit binaries)

[[Category:Tools]]
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[[Category:SDK 2013]]

{{SourceBranchCategory|src13sp}}
{{SourceBranchCategory|tf2branch}}