Executing an impulse command?

[TechieUK]

Alright, let me explain because the title's pretty vague:

I'm not very good at source coding. The most I've been able to do without the VDC is add new playermodels to the Deathmatch code using my brain to figure out what does what.

What I'm basically trying to do is execute the impulse 200 command when a player jumps, and again when they land. This would give the impression of lowering/raising the weapon so that it's not blocking their view, but I don't have a clue where to start.

Can anyone point me in the right direction?

[PhoeniX1992]

I think a better way would be to edit the code for jumping and adding a routine for lowering the weapon in that while the player is in the air. Hope that helps.

[TechieUK]

OK, I'll remember that. Unfortunately, my limited coding knowledge holds me back in these cases, but I'm trying to learn, so hopefully I can do it soon.

[Stormy]

Would there be a way to bind the console command to the space key without wiping the jump command? Maybe have it fire again when you land somehow, I assume there is some kind of callback, since the game needs to know when you land...

[TechieUK]

I think a better way would be to edit the code for jumping and adding a routine for lowering the weapon in that while the player is in the air. Hope that helps.

Would there be a way to bind the console command to the space key without wiping the jump command? Maybe have it fire again when you land somehow, I assume there is some kind of callback, since the game needs to know when you land...

Thanks for the ideas guys, but I think I found something I could do without touching the code.
When you press space, the +jump command is executed. I could create an alias for +jump that runs impulse and another for -jump. This would lower the gun on jump, and raise when you release the key. I think it might work.

[ErikKiller]

1) wouldn't it spam console and 2) wouldn't it require sv_cheats 1?

[TechieUK]

I don't think alias prints commands it executes, and I don't think impulse 200 is a cheat.

[PhoeniX1992]

I don't think alias prints commands it executes, and I don't think impulse 200 is a cheat.

As far as I remember all 'impulse' commands are considered cheats by the engine.

You're on the right track though! Find the code for the +jump and -jump events and add the code for 'impulse 200' there. Either rewrite the subroutine, or find out to what function or method the impulse 200 refers and make the code for +jump and -jump execute it too!

[zombie@computer]

If TS is able to compile the code:

step 1. search for the impulse command, you get the following code

Code: Select all

CBaseCombatWeapon *pWeapon;

         pWeapon = GetActiveWeapon();
         
         if( pWeapon->IsEffectActive( EF_NODRAW ) )
         {
            pWeapon->Deploy();
         }
         else
         {
            pWeapon->Holster();
         }


This tells you exactly how to hide (holster) weapons and show them again (deploy). Knowing this, go on with:

Find the jump code we go to hl_gamemovement.cpp (around line 1000)

Code: Select all

if ( mv->m_nButtons & IN_JUMP )
   {


add these lines somewhere:

Code: Select all

CBaseCombatWeapon *pWeapon = NULL;
pWeapon = GetActiveWeapon();
if (pWeapon != NULL)
   pWeapon->Holster();


and now we only need to find the code of the 'landing' . This is problematic, as the player is just 'thrown' so different code will control when the player hits the ground again. I suggest searching for 'land' , 'crunch' and variations thereof and placing the lines

Code: Select all

pWeapon = GetActiveWeapon();
if (pWeapon != NULL)
   pWeapon->Deploy() ;


somewhere and everywhere.

[TechieUK]

It looks so simple when you explain it like that! I guess I probably should have searched for the impulse and jump commands before I posted, but anyway, I'll try and implement that code tonight.

EDIT:
Compiling now, found the landing code by searching for land. I've put it in gamemovement.cpp in the Client. I'm hoping it works, I put the code everywhere it seemed to fit.

EDIT 2:
I must have done something wrong, I got quite a few undeclared identifier errors. I'll try again in hl_gamemovement.cpp in the Server.

EDIT 3:
Just got the lowering when jumping code in, I'm going to do it bit by bit. The only error I seem to be getting is:
.\shared\hl2\hl_gamemovement.cpp(1024) : error C3861: 'GetActiveWeapon': identifier not found