Ammo SharingTutorial
Introduction
This tutorial is taken from my mod Classic Quake Arena. Alot of people have been
asking me how I got the shotgun and super shotgun to share the
same ammo. There's no way (that I could see ;)) to get the two
weapons to actually share ammo, so what you need is a bit
of a workaround. I'll show you my way of doing it in this short
tutorial. This tutorial assumes you have a good working knowledge
of both C and the quake3 source code.
Preparatory
coding
First of course you'll need the code
in place for the two weapons you'd like to share ammo. The Shotgun
is set up as normal, as WP_SHOTGUN, and my new single
barrelled shotgun is WP_SISHOTGUN. The ammo for the single
shotgun in bg_misc is ammo_sishells, but this doesn't
matter, as this doesn't get used. Before you do any more coding,
you should just check that both of the weapons work properly and
use their ammo properly, then you're ready to get on with the rest
of the coding.
The Ammo Sharing code
Now onto the actually ammo sharing code itself. The principal
is to make sure that every time some ammo is picked up, or one of
the sharing weapons is fired, the other weapon has the same amount
of ammo. First, in g_items.c, at the end of the function
Add_Ammo, after the line
ent->client->ps.ammo[weapon] += count; :
if(weapon == WP_SHOTGUN) {
ent->client->ps.ammo[WP_SISHOTGUN]=ent->client->ps.ammo[WP_SHOTGUN];
} else if (weapon == WP_SISHOTGUN){
ent->client->ps.ammo
[WP_SHOTGUN]=ent->client->ps.ammo[WP_SISHOTGUN];
This makes sure that when ammo for the shotgun gets
picked up, the ammo for the single shotgun gets the same amount of
ammo, and vice versa. You shouldn't need the second branch of the
if/else, as you shouldn't put any ammo for the single shotgun in
your maps, but just incase I thought it was a good idea to put it
in. This code also handles picking up weapons as well as ammo
boxes.
Then you need to make sure that both weapons have
the same amount of ammo after one of the sharing weapons has been
fired. To do this you need to add some code to
bg_pmove.c, in the function PM_Weapon, just
before the line PM_AddEvent( EV_FIRE_WEAPON ); :
if(pm->ps->weapon == WP_SISHOTGUN) {
pm->ps->ammo[ WP_SHOTGUN ]
= pm->ps->ammo[ WP_SISHOTGUN ];
} else if(pm->ps->weapon == WP_NAILGUN) {
pm->ps->ammo[
WP_SUPERNAILGUN ] = pm->ps->ammo[ WP_NAILGUN ];
}
Everything is now set up. When you play the game you
should find that both weapons always have the same amount of ammo.
You can add some extra code so that one of the weapons uses two
shells or whatever, you just have to make sure you cover all
eventualities, such as the double-shot weapon having only 1 shell
left.
Compiling/Running
You should be able
to compile and run your mod as usual. Thanks for sticking with me throughout
this tutorial, if you have any problems with it or i've left
something out or got something wrong, please contact me at mailto:juz@planetquake.com
Juz
