Foreword
Fabien’s commentary on the classic game engine codebases have been a
wonderful resource on the web, so I was thrilled that he decided to start
expanding them all the way to book length. While often overshadowed by
Doom,Wolfenstein3Ddoesholdasignificantplaceinvideogamehistory,and
itremainsfuntorunaroundintoday,justlikedroppingaquarterinaPacMan
machine.
Despitebeingopensource,the16bitcodeandassemblylanguageisnoteasyto
buildorexperimentwith,sofarfewerpeoplehavelookedintoitthanthelater
codebases. The most remarkable thing about the project from today’s
perspective is just how small it was: one little directory of code files with no
external dependencies. Back then I barely trusted (with some reason!) the C
standardlibraryimplementationsthatwehadtoworkwith,soalmosteverything
wasdoneinthosefewsourcefiles.
I was 21 years old when I wrote most of the code, and I had only been
programminginCforayear,soitisfarfromamasterpieceofcodingstyle,but
therearestillsomethingsthatweredone well.Compiledscalersareacaseof
code specialization taken to the extreme, which, combined with the low level
VGA trick of multi column writes and the progressive performance
characteristics of ray casting make it much more even in framerate than a
conventional approach. The choice to use ray casting was also an important
pragmatic decision. I wasn’t experienced enough yet to do a solid
implementation of a polygon, or even line based, engine. Ray casting got me
whereIneededtobeatanacceptablecost.
So,settheway-backmachinefor1992.
ACHTUNG!
我的内容管理
收起
我的收益 登录查看自己的收益
我的积分
登录查看自己的积分
我的C币
登录后查看C币余额
我的收藏 
我的下载 
下载帮助 
