One of the engine's most notable features was out-of-the-box support for hardware-accelerated graphics, specificallyOpenGL, along with the traditional software renderer.[2] Another interesting feature was the subdivision of some of the components intodynamic-link libraries. This allowed both software and OpenGL renderers, which were selected by loading and unloading separate libraries. Libraries were also used for the game logic, with consequences including:
Since they were compiled for specific platforms, instead of aninterpreter, they could run faster thanQuake's solution, which was to run the game logic (QuakeC) in a limited interpreter.[5]
id could release the source code to allow modifications while keeping the remainder of the engine proprietary.[6]
As with previous id Software engines, level geometry usedbinary space partitioning, and would be authored usingconstructive solid geometry like in theQuake engine. The level environments were lit usinglightmaps, a method in which light data for each surface is precalculated (this time, via aradiosity method) and stored as an image, which is then overlaid onto the level geometry and used to determine the light intensity each 3D model should receive, but not its direction.[7][8]
Jake2 – aJava port of theQuake II engine'sGPL release. It has since been used bySun as an example ofJava Web Start capabilities for games distribution over the Internet.[16] In 2006, it was used to experiment playing 3D games witheye tracking.[17] The performance of Jake2 is on par with the original C version.[18]
Quake2Forge – one of the earliest community produced source ports.[19]
Quake2xp – a port ofQuake II to modern operating systems.[20][21][22]
KMQuake2 – an upgraded engine forQuake II.[22][23][24]
Quake 2 Evolved – early graphically enhanced game engine.[25][26][27][28]
Quetoo (formerlyQuake2World) – multiplayer focused port derived from Quake2Forge.[14][29]
Berserker@Quake2 – graphically enhancedQuake II port.[30]
Yamagi Quake II – a port ofQuake II to modern systems which aims to preserve the original gameplay.[31][32][33][34][22]
vkQuake2 – the originalQuake II engine with additionalVulkan renderer created by Krzysztof Kondrak, a programmer from Poland. It was originally released in December 2018 under theGPLv2.[35][36]
^Sanglard, Fabien (September 16, 2011)."Quake 2 Source Code Review 2/4".fabiensanglard.net. RetrievedJuly 29, 2023.Dynamic linking provided numerous advantages: [...] Full native speed for mods, no need to rely on QuakeC and Quake Vitual machine.
^Sanglard, Fabien (September 16, 2011)."Quake 2 Source Code Review 2/4".fabiensanglard.net. RetrievedJuly 29, 2023.Dynamic linking provided numerous advantages: [...] More capabilities to mod makers, the entire game could be altered via game.dll.
^Milne, Rory (March 1, 2019)."The making of Quake 2".pcgamer.com. RetrievedJuly 29, 2023.We also had light bouncing—simulated radiosity—so every corner of the world had some lighting.
^Sanglard, Fabien (September 16, 2011)."Quake 2 Source Code Review 3/4".fabiensanglard.net. RetrievedJuly 29, 2023.Contrary to Quake1, Quake2 used radiosity and colored light during the precalculation.
^"JDK 6u10: Jake2: Quake II in Java".Sun Microsystems. RetrievedJuly 27, 2023.The Jake2 applet example shows the future of game distribution over the Internet. Jake2 is a port of id Software's Quake II to the Java platform developed by Bytonic Software. (...). With the new Java Plug-In, it is now possible to deploy the game directly into the web page with full hardware acceleration and rock-solid reliability.
^"Q24j: Jake and Java-gaming Viability".O'Reilly Media. November 28, 2005. RetrievedJuly 18, 2009.This is a great show of 3D prowess. Things like this, as well as the Narya 2D open source engine from ThreeRings really are starting to at least show Java can serve as a first-class gaming platform. More than that, just having seen all the… *cough* horrible code in games before, having things like Java's threading model, network and database support might really make it a BETTER platform for a lot of forthcoming games than C.
