Add Client Side Callback Hooks

[SDarkMagic]

This change adds a few new global functions for registering client side callback functions as well as implementation for the callbacks. Specifically, the code from S2.ClientKillCallback is added to allow for easier installation of mods that depend on these features. Addtionally, callbacks that trigger when any entity is killed regardless of the type have been added. Similarly callback handlers are added to cl_player.gnut and weapons/sh_titancore_utility.gnut to allow callbacks when the player does damage or uses a titan core.

To register a new callback, the following functions can be used:

• AddCallback_OnPlayerKilled - passes an instance of the ObituaryCallbackParams struct to the callback
• AddCallback_OnEntityKilled - passes an instance of the ObituaryCallbackParams struct to the callback
• AddCallback_OnUsedCore - passes the titan and weapon entities being used to the callback in that order
• AddCallback_OnLocalPlayerDidDamage - passes an instance of PlayerDidDamageParams to the callback

[GeckoEidechse]

Note to self that this adds vanilla files which will need to be committed first before merge

[GeckoEidechse]

Just to be clear, this would basically replace S2.ClientCallback by integrating it into Northstar, right? ^^

[SDarkMagic]

Correct

[NachosChipeados]

Works fine in testing
https://github.com/user-attachments/assets/11818cae-f92e-4352-a47a-09ca9c474ee6

Script used:

untyped

global function testcallbacks_Init

void function testcallbacks_Init()
{
#if MP
	AddCallback_OnPlayerKilled ( testcallbacks_player)
	AddCallback_OnEntityKilled ( testcallbacks_entity)
#endif

	AddCallback_OnUsedCore ( testcallbacks_core)
	AddCallback_OnLocalPlayerDidDamage( testcallbacks_damage )
}

#if MP
void function testcallbacks_player( ObituaryCallbackParams params )
{
	printt( "------------------" )
	printt( "ow" )
	printt( "------------------" )
}

void function testcallbacks_entity( ObituaryCallbackParams params )
{
	printt( "------------------" )
	printt( "oof" )
	printt( "------------------" )
}
#endif

void function testcallbacks_core(entity player, entity titan)
{
	printt( "------------------" )
	printt( "ouch" )
	printt( "------------------" )
}


void function testcallbacks_damage( PlayerDidDamageParams params )
{
	printt( "------------------" )
	printt( "owie" )
	printt( "------------------" )
}

Another example:

untyped

global function SniperVGUI_Init

void function SniperVGUI_Init()
{
	AddCallback_OnLocalPlayerDidDamage( SniperVGUI_DidDamage)
}

void function SniperVGUI_DidDamage( PlayerDidDamageParams params )
{
	entity attacker = GetLocalViewPlayer()
	if ( !IsValid( attacker ) )
		return
		
	entity victim = params.victim
	if ( !IsValid( victim ) )
		return

	int damageType = params.damageType
	int hitGroup = params.hitGroup

	bool isCritShot = (damageType & DF_CRITICAL) ? true : false

	entity activeweapon = attacker.GetActiveWeapon()
	
	var isSniper 
	if ( IsValid (activeweapon) )
		isSniper = activeweapon.GetWeaponInfoFileKeyField( "is_sniper" )

	if ( !attacker.IsTitan() )
	{
		// Reapers only have the "chest" hitgroup so it looks bad
		if (!victim.IsTitan() && !IsSuperSpectre( victim ) && victim.GetSignifierName() != "npc_turret_mega" )
		{
			if ( hitGroup != HITGROUP_GENERIC && isSniper )
				attacker.Signal( "UpdateSniperVGUI", { hitGroup = hitGroup } )
		}
		else if (victim.IsTitan() )
		{
			if ( hitGroup == HITGROUP_GENERIC || isCritShot && isSniper )
				attacker.Signal( "UpdateSniperVGUI", { hitGroup = hitGroup } )
		}
	}
}

I'd also like to add that i have a mod that would benefit from the OnLocalPlayerDidDamage callback, since it currently overrides cl_player.gnut and cl_sp_player.gnut to make my changes.

Pretty much the only complaint i have, is that there should also be a OnLocalPlayerDidDamage callback in cl_sp_player.gnut, since trying to load into sp causes an error.