View source for Metamod:Source 1.9.0 Release Notes

=New Engine Support=

Support has been added for using Metamod:Source on Counter-Strike: Global Offensive. This game uses a variation of the Source engine present in Alien Swarm and moreso Portal 2.

==SDK Changes==
AlliedModders has reverse engineered a CS:GO SDK capable of building plugins. This attempt is preliminary and more fixes may come as we explore the engine. You can grab a copy from [http://hg.alliedmods.net/ our Mercurial forest] (see the bottom of the page). If you discover any changes yourself, we greatly appreciate [https://bugs.alliedmods.net/ bug reports] or any attempts at notifying us.

=New API Changes=
Metamod:Source now treats Counter-Strike: Source as a separate "CSS" engine, since compatibility diverges from "Orangebox Valve" at times. <tt>GetSourceEngineBuild</tt> now returns a new <tt>SOURCE_ENGINE_CSS</tt> value for this game. Similarly, users of the "extended loading" API will see this value in <tt>MetamodVersionInfo</tt>.