Update

doom.md

@@ -6,7 +6,7 @@ Doom is a legendary video [game](game.md) released in 1993, perhaps the most fam
 
 Partially thanks to the free release of the engine and its relatively [suckless](suckless.md) design ([C](c.md) language, [software rendering](sw_rendering.md), ...), Doom has been [ported](port.md), both officially and unofficially, to a great number of platforms (e.g. [Gameboy Advance](gba.md), [PS1](playstation.md), even [SNES](snes.md)) and has become a kind of **de facto standard [benchmark](benchmark.md)** for computer platforms -- you will often hear the phrase: **"but does it run Doom?"** Porting a Doom to any platform has become kind of a [meme](meme.md), someone allegedly even ported it to a pregnancy test (though it didn't actually run on the test, it was really just a display). { Still [Anarch](anarch.md) may be even more portable than Doom :) ~drummyfish }
 
-The Doom engine was revolutionary and advanced (not only but especially) video game graphics by a great leap, considering its predecessor [Wolf3D](wolf3D.md) was really primitive in comparison. Doom used a technique called **[BSP rendering](bsp.md)** that was able to render [realtime](realtime.md) 3D views of textured environments with distance fog and enemies and items represented by 2D [billboards](billboard.md) ("sprites"). No [GPU](gpu.md) acceleration was used, graphics was rendered purely with [CPU](cpu.md) (so called [software rendering](sw_rendering.md)). This had its limitations, for example the camera could not tilt up and down and the levels could not have rooms above other rooms. For this reason some call Doom "[pseudo 3D](pseudo3d.md)" or 2.5D rather than "true 3D". Nevertheless, though with limitations, Doom did present 3D views and internally it did work with 3D coordinates (for example the player or projectiles have 2D position plus height coordinate), despite some dumb YouTube videos saying otherwise. For this reason we prefer to call Doom a **primitive 3D** engine, but 3D nonetheless. However Doom was not just a game with good graphics, it had extremely good gameplay, legendary music and art style and introduced the revolutionary [deathmatch](deathmatch.md) multiplayer. It was a success in every way.
+The Doom engine was revolutionary and advanced (not only but especially) video game graphics by a great leap, considering its predecessor [Wolf3D](wolf3D.md) was really primitive in comparison (Doom basically set the direction for future trends in games such as driving the development of more and more powerful [GPUs](gpu.md) in a race for more and more impressive visuals). Doom used a technique called **[BSP rendering](bsp.md)** that was able to render [realtime](realtime.md) 3D views of textured environments with distance fog and enemies and items represented by 2D [billboards](billboard.md) ("sprites"). No [GPU](gpu.md) acceleration was used, graphics was rendered purely with [CPU](cpu.md) (so called [software rendering](sw_rendering.md), GPU rendering would come with Doom's successor [Quake](quake.md)). This had its limitations, for example the camera could not tilt up and down and the levels could not have rooms above other rooms. For this reason some call Doom "[pseudo 3D](pseudo3d.md)" or 2.5D rather than "true 3D". Nevertheless, though with limitations, Doom did present 3D views and internally it did work with 3D coordinates (for example the player or projectiles have 2D position plus height coordinate), despite some dumb YouTube videos saying otherwise. For this reason we prefer to call Doom a **primitive 3D** engine, but 3D nonetheless. However Doom was not just a game with good graphics, it had extremely good gameplay, legendary music and art style and introduced the revolutionary [deathmatch](deathmatch.md) multiplayer, as well as a HUGE modding and mapping community. It was a success in every way -- arguably no other game has since achieved a greater revolution than Doom.
 
 Doom source code is written in [C89](c.md) and is about 36000 [lines of code](loc.md) long. The original system requirements needed roughly a 30 MHz [CPU](cpu.md) and 4 MB [RAM](ram.md) as a minimum. It had 27 levels (9 of which were shareware), 8 weapons and 10 enemy types.