CDoom v2.05 reference 



FEATURES: 



Music system: support opl2/opl3/mpu401, the only engine that playback music

identically to doom2.exe original. The mus_card variable in the cdoom.cfg

file defines the value 0 as autodetect, 1 opl2, 2 opl3, 3 none, 4 mpu401. 



True 3d gameplay: optional, can be changed in the options menu. 



Jump: use the key ';'(default), with the cheat JET, can toggle fly mode.

Other cheats: INFINITE- infinite ammo, RES- ressurrect the player when it

dies.



3d floors: very fast rendering, may have some bugs, when running a map with

one 3d floor is as if added one sector more, when adding many 3d floors, slow

down little(see Metro1,Metro2,Metro3,Mercurio test maps). The thing sprites

code rendering in 3d floors is not complete(wrong render order sometimes).



Monsters infight: dehacked option added, for imps against imps, etc. 



Sound: works with a SB or compatible card, is a simplified driver.



ENHANCEMENTS: 



Detection of blockmap/reject ausent to avoid crash when one of this resources

are missed, or for automatic blockmap building by CDoom. 



Blockmap collision better in huge maps, Metro1.wad,Metro2.wad,Metro3.wad.

When running this maps in MBF, some blockmap points donīt collide properly. 



Demo playback: maximum compatibility with doom2.exe v1.9 and MBF v2.03,boom

demos may not playback properly. Few demos of doom2.exe v1.9 may

desync(eternal et312223). There is demos bad recorded that desync with 

doom2.exe too.



General speed: extremely optimized, sound code fast, 3d floor code donīt

slowdown the program, video code fast, run in WINNT.

The speed of -fastdemo nx22-051 in a pentium 233 is 227 fps maximum. Faster

than doom2.exe. The only engine that is faster than CDoom is Boom 2.02

because use a video mode that is a standard VGA. CDoom uses unchained VGA

mode, with page flipping that is slower than standard VGA.



This is not a enhancement, but CDoom is a very objective engine, very small

size, removed all allegro functions and other doom unused functions. I made

my own sound library in External.c and the all external access functions. 



NOTES: 



If sound donīt work in WINNT, WIN2K, try VDMsound library.

For building 3d floors, there is a special rule in CDoom 2.05. First add the

lowest 3d floor(lynetypes 281,400 for solid 3d floors and 403 for liquid 3d

floors), later the second lowest and so on, until the last be the highest,

this is to avoid rendering the lowest plane above the highest and vice versa

causing some rendering errors,and to avoid that the lightlevel be wrong.

The features of this port are covered by other ports, but the diference is

that CDoom is very faster than other except Boom 2.02. But take care, boom

uses __djgpp_nearptr_enable, disprotect the memory, may cause data lost and

cannot run in WINNT, linux DOSEMU. 



Credits to: Jesus Christ 



Autor: Carlos Guariglia

Email: carlos@doom.zzn.com