Portal 2 engine branch
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Titanfall branch (heavily modified)
Note:Counter-Strike: Global Offensive used to be on the branch that debuted with it, but as of Counter-Strike 2's official release, which upgraded the game to Source 2, and renamed CS:GO to Counter-Strike 2, this make Portal 2 engine branch the latest Source 1 branch that still being actively maintained by Valve.
Portal 2 engine branch
In-game screenshot of Portal 2, running on Portal 2 engine branch.
Developer(s)
Release date(s)
April 18, 2011
Platform(s)
Forks
Titanfall branch (heavily modified)Predecessor
Successor
Improved shadow mapping in Portal 2.
Blob particles in Portal 2.
The 
Portal 2 engine branch was introduced with Portal 2 in 2011. It was forked from the 
Left 4 Dead engine branch between and 
, with some elements added on from the 
Alien Swarm engine branch (which it succeeded). It was superseded by the 
CS:GO engine branch. With the release of Portal 2, this marks the first time Source engine was ported to PlayStation 3, since the release of The Orange Box.
Note:Counter-Strike: Global Offensive used to be on the branch that debuted with it, but as of Counter-Strike 2's official release, which upgraded the game to Source 2, and renamed CS:GO to Counter-Strike 2, this make Portal 2 engine branch the latest Source 1 branch that still being actively maintained by Valve.Features
New since the Alien Swarm engine branch is:
- Improved shadow mapping
- The entity env_projectedtexture is significantly improved. Compared to previous implementations, it has higher default resolution, better edge filtering and support for the caching of shadows from static objects.
- Video playback on materials
- Added support to render Bink Video in-game on surfaces, used for elevator screens in Portal 2.
- Blob particles
- A particle renderer that renders blobs of liquid, used for paint gel in Portal 2. A similar blob particles system are originally present in Source 2007 or Source 2009, but was disabled in code.
- World portals
- World portals that can seamlessly link together separate parts of the world. This feature is exclusive to this engine branch.
- Sound operators
- For defining complex audio behaviour.
- Finished water debris flow
- The base texture water flow feature from the Alien Swarm engine branch has been finished, with flowed normals now distorting color lookup and the flow map's alpha channel controlling color map opacity.
Tools
- Hammer new features
- DotA Camera - restrict the camera to be in the DotA orientation and distance from the ground. Likely included because Valve likely used Portal 2 Hammer to create Dota 2 maps (during it's development), or simply was mistakenly (or for whatever reason) backported to Portal 2 Hammer.
PS3 exclusive features
- Official PS3 Support
- PS3 is now officially supported by Valve. Unlike the PS3 port of
The Orange Box, which was outsourced to Electronic Arts (EA), which ended up suffering from occasional frame drops and other technical issues as Valve had difficulties utilizing the SPEs cores on the PS3 at the time. The PS3 version of Portal 2 takes advantages of SPEs cores on the RSX processor, allowing for better performance. Of little use to modders, needless to say. - MLAA anti-aliasing
- Post-processing effect used to reduce stair-step (aliasing) effect on geometry and transparent textures, while having less performance impact compared to MSAA.
- Steam integration (Steamworks)
- PlayStation 3 version of Portal 2 features Steam integration. Achievements are synced with both PSN and Steam, and PS3 users were able to complete co-op levels with Steam friends. Steam services on PS3 were shut down in 2016.
- PlayStation Move support
- Portal 2 on PS3 supports PlayStation Move motion controller.
Availability and usage
List of games that runs on Portal 2 engine branch.
See also: Category:Portal 2 engine branch games
- 2011 Portal 2
- 2012
Portal 2 Sixense Perceptual Pack (delisted) - 2015
Portal Stories: Mel - 2021
Portal Reloaded
- 2012
- 2011
Dino D-Day (formerly Left 4 Dead engine branch). - 2013
The Stanley Parable - 2014 Consortium (delisted)
- Replaced by Unreal Engine 4 remaster named Consortium Remastered. However the 2014 version of the game is still available if you purchase the Remaster or Consortium VR.
- 2015
The Beginner's Guide
- Based off The Stanley Parable engine.
- Based off
- 2016
INFRA - TBA
PUNT
A third-party, heavily modified version of this engine used for Titanfall & other games by Respawn Entertainment, called the Titanfall branch, is also available, and it is used on the following games:
- 2014 Titanfall (delisted)
- 2016
Titanfall 2 - 2019
Apex Legends
- 2014
Source code and SDK Base for these branches is not available. However, authoring tools exist for custom content.
