trace_notes.md

d_main.c:

void D_DoomMain(void)

Parameter checking

reuses again and again the “p” variable to represent the parameter checking it's doing quite a few of the parameters checked initialise global variables, others call functions. a lot of it seems to be related to multiplayer.

Zone Memory Allocation

bit of a loss here. a zone consists of a blocklist of memblocks? the blocks have "users"? seem to take structure of linked list? have tags and ids, too. something to do with locality?

Init Subsystems

Allocate Screens

Load config files, use defaults where not overridden

Also setup a hook to save config file when we exit

Find and load IWAD

Get version / variant from IWAD so we know how to switch up behaviour

Add PWADs

Play demos

Generate lump hash table for performance?

Set game description

Print startup banner

Deal with screensaver support

Init SDL stuff

Timer

Joystick

Sound

Looks like it always tried to start timidity when it's set to native musi? Maybe its needed to use native midi. Might have to fork it or sometihg?