Quake DeveLS - Impulse 69 Revisited
Author: Patrick
Wagstrom(Pridkett)
Difficulty: Easy
One would have thought
that after all of the fun that Capture The Flag was for Quake that one of the
most simple functions from it would have been included in Quake 2, the beloved
impulse 69. The command that allowed one key to be pressed to launch a rocket
and swap back to whatever weapon was being used before. Well, Quake 2 didn't
have one so after about 20 minutes of coding I was able to make this one.
Note:
Text in red = Quake II's code
Text in
blue = Our code
Text in
gray = Comments
First we open up one of
the most useful files in the game: g_cmds.c. This is the file that holds all of
the information about commands and what do with them. Then we add a really
simple function to the top of the file:
//::Pridkett/*===============int lastWeapon(int)===============*/int lastWeapon(int a){ static int lWeapon; //Last weapon used static int lWeapon2; //The current weapon if (a != -1) { lWeapon=lWeapon2; lWeapon2=a; } return lWeapon;}//!Pridkett
This is the function that
is used to store the information on the last weapon. It has two static
variables, meaning they stay when the function exits. It takes a parameter and
returns another. The parameter is the new weapon. In Quake 2 the weapons are
items 7-16. When a value of -1 is passed, it tells the function to retain the
current values but return the last weapon used.
Now that this function is
done, we make the fucntion actually work. Quake 2 simplified this with the use
commmand. So lets look at the section of code that handles that:
/*==================Cmd_Use_fUse an inventory item==================*/void Cmd_Use_f (edict_t *ent){ int index; gitem_t *it; char *s; s = gi.args();it = FindItem (s);
//::Pridkett if (Q_stricmp(s,"prevweap") == 0) { it = GetItemByIndex(lastWeapon(-1)); lastWeapon(ITEM_INDEX(it)); } //!Pridkett if (!it) { gi.cprintf (ent, PRINT_HIGH, "unknown item: %s\n", s); return; } index = ITEM_INDEX(it); if (!ent->client->pers.inventory[index]) { gi.cprintf (ent, PRINT_HIGH, "Out of item: %s\n", s); return; } it->use (ent, it); //::Pridkett if (ITEM_INDEX(it) > 6 && ITEM_INDEX(it) < 17 && Q_stricmp(s,"prevweap") != 0) lastWeapon(ITEM_INDEX(it)); //!Pridkett }
What this does it is check
to see if the string sent was "prevweap" and if it was, then set the
g_item "it" to the item that was the last weapon. Then at the bottom
is the code that updates the weapons functions. If the index of the g_item
"it" is from 7 to 16 and the prevweap command was not called then it
updates the lastWeapon variables.
Now we need to make it
work for when you are scrolling through your weapons using weapnext and
weapprev. So we open those functions and once again have some fun. Find the
following section in your Cmd_WeapNext_f and Cmd_WeapPrev_f functions:
if (cl->pers.weapon == it) return; // successful
And replace both of them
with this:
if (cl->pers.weapon == it) //::Pridkett { lastWeapon(ITEM_INDEX(it));//!Pridkett
return; // successful //::Pridkett } //!Pridkett
Now you should be able to
bind a key to "use prevweap" and the switch two weapons far apart and
use only one key to switch back. A nice script could be:
Alias RocketShot "use
Rocket Launcher; +attack; wait; use prevweap"
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