Index

1. How to debug the game engine with emacs/gdb

• these are very brief notes on how you can debug your dhewm3 engine with emacs and gdb
  • this game engine will also have had python bots capability added
• firstly it is a good idea to ensure that you have no python bots running on your machine

• $ ps aux | grep python

• use the Unix command line kill command to kill any process running python and doom
  

2. Build a test map including python bot

• $ cd Sandpit/chisel/python
  $ ./developer-txt2map ../maps/python.txt

• now run gdb from within emacs
  • start emacs and press F5, which will compile dhewm3 and start gdb
• now exit from dhewm3
• in the .gdbinit emacs buffer add the line break idPlayer::RegisterPython before the line run
  • we are informing gdb that we wish to add a breakpoint in the RegisterPython method
• now press F5 again
  • this will run gdb and set the breakpoint as requested
• from a command line terminal run the python bot

• $ Sandpit/git-doom3/pybot-dhewm3/python-bot
  $ python python_doommarine.py 0

• dhewm3 should start, now tell dhewm3 to load in tiny.map
  • it should now connect to your python doom marine
  • and then it should stop at the break point in RegisterPython
• in emacs press M-x gdb-many-windows
  • ie <ALT> x gdb-many-windows
• you can now single step and inspect the game engine using the gui/mouse interface of emacs or the command line in the gdb window

Index

This document was produced using groff-1.22.