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Concept
GoldSrc
Summary
GoldSrc (pronounced "gold source"), sometimes called the Half-Life Engine, is a proprietary game engine developed by Valve. At its core, GoldSrc is a heavily modified version of id Software's Quake engine. It originally made its debut in 1998 with Half-Life, and would power future games developed by or with oversight from Valve, including Half-Life expansions, Day of Defeat, and multiple games in the Counter-Strike series.
GoldSrc was succeeded by the Source engine with the releases of Half-Life: Source, Half-Life 2, and Counter-Strike: Source in 2004. However, Valve continues to support the engine with periodic updates.
The basis of GoldSrc is the engine used in the video game Quake, albeit with heavy modification by Valve. While the engine served as the basis for GoldSrc, Gabe Newell has stated that a majority of the code used in the engine was created by Valve themselves. GoldSrc's artificial intelligence systems, for example, were essentially made from scratch.cite web |last=Bokitch |first=Chris |date=August 1, 2002 |title=Half-Life'''s Code Basis |url= |archive-url= |archive-date=March 1, 2007 |access-date=February 12, 2011 |website=Valve Editing Resource Collective |publisher=Valve The engine also reuses code from other games in the Quake series, including QuakeWorld and Quake II, but this reuse is minimal in comparison to that of the original Quake.
In 1997, Valve hired Ben Morris and acquired , a tool for creating custom Quake maps. The tool was later renamed to Valve Hammer Editor and became the official mapping tool for GoldSrc. The engine supports skeletal animation, which allowed for more realistic body kinematics and facial expression animations than most other engines at the time of release.
Prior to the creation of the Source engine, the GoldSrc engine had no real title and was simply called "The Half-Life engine". When the need arose for Valve to work on the engine without risking introducing bugs into Half-Lifes codebase, Valve forked the code from the Half-Life engine, creating two main engine branches: one gold master branch titled "GoldSrc" and the other "Src".
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