Strata Source
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Strata Source (more informally known as Strata, and formerly known as the Chaos Engine) is a third-party
Source engine branch using licensed code. It is a modified version of the
CS:GO engine branch that combines the features of both CS:GO and the
Portal 2 engine branch, along with many improvements that bring Source close to modern standards. This engine branch was first released publicly with the launch of
Portal: Revolution, and is still in active development.
Features

Feature list from the Strata Source Wiki
New since the CS:GO engine branch:
- Native Direct3D 11 renderer
- Replaces Direct3D 9 renderer, and adds some new features that previous version of Direct3D doesn't have.
- Vulkan renderer on Linux, using DXVK to convert DX11 calls to Vulkan
- 64-bit executable
- Game runs on 64-bit on all platforms; 32-bit and Mac OS support has been dropped. 64-bit allows better performance and allows the game to access more than 4GB of RAM.
- PBR shaders
Introduces a new
PBR
shader that attempts to create realistic reactions to light
- Ported Portal 2 engine branch features
- Including but not limited to World Portals and Portal gun
- Backwards compatibility with BSP v19-21, as well as BSP v25 support
- Backwards compatibility with
Source 2013 (and older) branch models
- The model format found in games such as
is now supported.
- WEBM video support, replacing older Bink videos
- Increased framerate, lower file sizes, and easier to author
- New v7.6 VTF version
- Adds support for the higher-quality ATI1N, ATI2N, BC6H, and BC7 texture compression formats, as well as lossless
deflate compression on top of existing image format, for reduced size. Better support for 4K textures[Como?].
- Many improvements to Linux support
- Audio format improvements
- Improved MP3 (MPEG Audio Layer 3) support with addition of OGG (Vorbis, Opus, Speex and PCM supported) and FLAC (Free Lossless Audio Codec) audio format support thanks to Libsndfile replacing minimp3
- Fully cross-platform engine tools and utils
- Steam Audio
- Improved HRTF, environmental reflection effects, basic occulsion
- Many improvements to the
Hammer level editor, named
Strata Hammer
- Many code quality improvements (Refactors, cleanup, and C++20)
- Sentry crash report integration
Availability
The following titles run on the Strata Source branch:
Portal 2: Community Edition
Momentum Mod
Portal: Revolution (Uses older version of P2:CE as a base)
The source code for this branch is not available, however, authoring tools exist for each game, located in /bin/win64/
.
See also
- Strata Source's Wiki
Mapbase, a mod for Source 2013 Singleplayer with similar goals
Alien Swarm Deferred
Strata Hammer