View source for General SDK Snippets & Fixes

__FORCETOC__

= Snippets =
== Fixing imported CS:S weapons in HL2 based mods ==

{{Main|Importing CSS Weapons Into HL2}}

== Crossbow bolt going through glass (func_breakable) ==

Open {{path|src/game/server/hl2/weapon_crossbow|cpp}}

Start off by adding <code>#include "func_break.h"</code>

Then in {{Code|highlight=c|CCrossbowBolt::BoltTouch( CBaseEntity *pOther )}}, after:
<source lang="cpp">
if ( pOther->GetCollisionGroup() == COLLISION_GROUP_BREAKABLE_GLASS )
	return;
</source>

Insert the following code:
<source lang="cpp">
if ( FClassnameIs(pOther, "func_breakable") )
{
    CBreakable* pOtherEntity = static_cast<CBreakable*>( pOther );
    if ( pOtherEntity->GetMaterialType() == matGlass )
        return;
}
</source>


{{todo|This could be taken further, allowing the bolts to go through <code>matWeb</code> or through any '''func_breakable_surf''' for example.}}

== Ignite ragdolls ==

In your player's class (<code>CSDKPlayer</code> or <code>CBasePlayer</code>) find the <code>Event_Killed()</code> function. Add this inside of it:
<source lang="cpp">
if( info.GetDamageType() & (DMG_BLAST|DMG_BURN) )
{
    if( m_hRagdoll )
    {
        CBaseAnimating *pRagdoll = (CBaseAnimating *)CBaseEntity::Instance(m_hRagdoll);
        if( info.GetDamageType() & (DMG_BURN|DMG_BLAST) )
        {
            pRagdoll->Ignite(45, false, 10 );
        }
    }
}
</source>

If you don't have a ragdoll to ignite before that is called, make sure that code is placed after a call to <code>CreateRagdollEntity()</code>.
If you're not doing that, add it in right above the <code>if( info.GetDamageType() & (DMG_BLAST|DMG_BURN) )</code> line.

== Control height and width of icon progress bars ==

This allows you to control the height and width of progress bars drawn with icons instead of the bars being the same dimensions as the textures.<br>
In the file {{path|src/game/client/hud|h}} add the function declaration:
<source lang="cpp">
void	DrawIconProgressBarExt( int x, int y, int w, int h, CHudTexture *icon, CHudTexture *icon2, float percentage, Color &clr, int type );
</source>

Underneath the old declaration:
<source lang="cpp">
void    DrawIconProgressBar( int x, int y, CHudTexture *icon, CHudTexture *icon2, float percentage, Color& clr, int type );
</source>

Then in {{path|src/game/client/hud_redraw|cpp}} add the function itself:
<source lang="cpp">
void CHud::DrawIconProgressBarExt( int x, int y, int w, int h, CHudTexture *icon, CHudTexture *icon2, float percentage, Color& clr, int type )
{
	if ( icon == NULL )
		return;

	//Clamp our percentage
	percentage = min( 1.0f, percentage );
	percentage = max( 0.0f, percentage );

	int	height = icon->Height();
	int	width  = icon->Width();

	//Draw a vertical progress bar
	if ( type == HUDPB_VERTICAL )
	{
		int	barOfs = height * percentage;

		icon2->DrawSelfCropped( 
			x, y,  // Pos
			0, 0, width, barOfs, // Cropped subrect
			w, (h * percentage), clr );

		icon->DrawSelfCropped( 
			x, y + (h * percentage), 
			0, barOfs, width, height - barOfs, // Cropped subrect
			w, h - (h * percentage), clr );
	}
}
</source>

This was tested with vertical bars, horizontal bars haven't been tested.

== Enabling func_precipitation rendering whilst in a point_viewcontrol ==

In {{path|src/game/client/viewrender|cpp}} find and delete:
<source lang="cpp">
if ( CurrentViewID() == VIEW_MONITOR )
   return;
</source>

== Randomizing models ==

Have some global constant char* of every model:
<source lang="cpp">
static const char* modelnames[] = {
   "Model1", // 0
   "Model2", // 1
   "Model3", // 2
};
</source>

And choose one at random in the {{Code|highlight=c|Spawn()}} function:
<source lang="cpp">
SetModel (modelnames[ random->RandomInt( 0, ARRAYSIZE(modelnames) - 1 ) ]);
</source>

And if you wish to have a different skin for each model (provided your model was compiled with multiple skins), then you can add:
<source lang="cpp">
m_nSkin = random->RandomInt( 0, GetModelPtr()->numskinfamilies() - 1 );
</source>

== Simple camera animation implementation for weapons ==

Go to {{path|src/game/client/view|cpp}} then head over to {{Code|highlight=c|void CViewRender::Render( vrect_t *rect )}}

Scroll down until you find {{Code|highlight=c|RenderView( view, nClearFlags, flags );}}, then paste this code above it:
<source lang="cpp">
if ( pPlayer && pPlayer->InFirstPersonView() && pPlayer->GetViewModel( 0 ) )
{
	int iCamAttachment = pPlayer->GetViewModel( 0 )->LookupAttachment( "camera" );

	if ( iCamAttachment != -1 )
	{
		Vector cameraOrigin = Vector(0, 0, 0);
		QAngle cameraAngles = QAngle(0, 0, 0);
		pPlayer->GetViewModel( 0 )->GetAttachmentLocal( iCamAttachment, cameraOrigin, cameraAngles );
		view.angles += cameraAngles;
		view.origin += cameraOrigin;
	}
}
</source>

{{note|Valve uses the  "attach_camera" attachment name in {{l4d2}} and "cam_driver" in {{csgo}}, if you prefer backwards compatibility.}}

== A way to suppress the "Node Graph out of Date. Rebuilding..." message ==

This snippet will hide the message from appearing unless [[Developer|developer]] mode is enabled.


Go to {{path|src/game/server/ai_networkmanager|cpp}} then head over to {{Code|highlight=c|void CAI_NetworkManager::DelayedInit( void )}}

Scroll down until you find this line of code: (Should be near line 1113)
<source lang="cpp">
UTIL_CenterPrintAll( "Node Graph out of Date. Rebuilding...\n" );
</source>

And simply change it this:
<source lang="cpp">
if ( developer.GetBool() )
	UTIL_CenterPrintAll( "Node Graph out of Date. Rebuilding...\n" );
</source>

{{idea|For those of you that want to keep this in but wants to spice things up a bit, replace '''"Rebuilding..."''' with '''"Refunding..."'''}}

== Self casting player shadows ==

Go to {{path|src/game/client/c_baseplayer|h}}, scroll down until you find
<source lang=cpp>
virtual ShadowType_t ShadowCastType() { return SHADOWS_NONE; }
</source>

and simply change that to:
<source lang=cpp>
virtual ShadowType_t ShadowCastType() { return SHADOWS_RENDER_TO_TEXTURE_DYNAMIC; }
</source>

Your playermodel (by default '''player.mdl''') should now cast shadows.

== Enabling shadow receiving on viewmodels ==

Go to {{path|src/game/shared/baseviewmodel_shared|h}}, scroll down until you find
<source lang=cpp>
virtual bool ShouldReceiveProjectedTextures( int flags )
{
	return false;
}
</source>

and simply change that to:
<source lang=cpp>
virtual bool ShouldReceiveProjectedTextures( int flags )
{
	return true;
}
</source>

Your viewmodels should now be able to receive shadows.

== Seamless cubemaps hack ==

Go to {{path|src/game/client/viewrender|cpp}}, scroll down until you find the {{Code|highlight=c|RenderView( ... )}} function, then add this snippet:
<source lang=cpp highlight=7-8>
void CViewRender::RenderView( const CViewSetup &viewIn, int nClearFlags, int whatToDraw )
{
	m_UnderWaterOverlayMaterial.Shutdown();					// underwater view will set

	m_CurrentView = view;

	if ( building_cubemaps.GetBool() )
		m_CurrentView.fov = RAD2DEG( 2.0f * atanf( 64.0f / ( 64 - 0.5f ) ) );
}
</source>

You should now have seamless cubemaps!

== Remove ear ringing from explosions == 

If you find the ear ringing to be annoying and want to remove it, simply go to {{path|src/game/server/player|cpp}}, go to  {{Code|highlight=c|void CBasePlayer::OnDamagedByExplosion}}, find this line:
<source lang=cpp>
int effect = shock ? 
		random->RandomInt( 35, 37 ) : 
		random->RandomInt( 32, 34 );
</source>
and replace it with this:
<source lang=cpp>
int effect =  random->RandomInt( 32, 34 );
</source>

= Fixes =
== Stopping viewmodels from getting rotated when zooming ==

In {{path|src/game/client/view|cpp}} find {{Code|highlight=c|void CViewRender::SetUpViews()}} and search for the line
<source lang="cpp">
view.fovViewmodel = g_pClientMode->GetViewModelFOV() - flFOVOffset;
</source>

and replace it with
<source lang="cpp">
view.fovViewmodel = fabs( g_pClientMode->GetViewModelFOV() - flFOVOffset );
</source>

That will simply stop negative FOVs to occur, which were causing a rotating of 180°.

== Restoring the Combine Elite Soldier's ability to use the alt-fire of the SMG1 ==

In {{path|src/game/server/hl2/weapon_smg1|cpp}}, go to line 48 and replace {{Code|highlight=c|WeaponRangeAttack2Condition( float flDot, float flDist )}} with this:
<source lang="cpp">
int WeaponRangeAttack2Condition();
</source>

Now from the lines 249 to 274 (all the disabled code) replace it with this code:
<source lang="cpp">
case EVENT_WEAPON_AR2_ALTFIRE:
{
	CAI_BaseNPC *npc = pOperator->MyNPCPointer();

	Vector vecShootOrigin, vecShootDir;
	vecShootOrigin = pOperator->Weapon_ShootPosition();
	//vecShootDir = npc->GetShootEnemyDir( vecShootOrigin );

	//Checks if it can fire the grenade
	WeaponRangeAttack2Condition();

	Vector vecThrow = m_vecTossVelocity;

	//If on the rare case the vector is 0 0 0, cancel for avoid launching the grenade without speed
	//This should be on WeaponRangeAttack2Condition(), but for some unknown reason return CASE_NONE
	//doesn't stop the launch
	if (vecThrow == Vector(0, 0, 0)){
		break;
	}

	CGrenadeAR2 *pGrenade = (CGrenadeAR2*)Create("grenade_ar2", vecShootOrigin, vec3_angle, npc);
	pGrenade->SetAbsVelocity( vecThrow );
	pGrenade->SetLocalAngularVelocity(RandomAngle(-400, 400)); //tumble in air
	pGrenade->SetMoveType(MOVETYPE_FLYGRAVITY, MOVECOLLIDE_FLY_BOUNCE);

	pGrenade->SetThrower(GetOwner());

	pGrenade->SetGravity(0.5); // lower gravity since grenade is aerodynamic and engine doesn't know it.
		
	pGrenade->SetDamage(sk_plr_dmg_smg1_grenade.GetFloat());

	if (g_pGameRules->IsSkillLevel(SKILL_HARD))
	{
		m_flNextGrenadeCheck = gpGlobals->curtime + RandomFloat(2, 3);
	}
	else{
		m_flNextGrenadeCheck = gpGlobals->curtime + 6;// wait six seconds before even looking again to see if a grenade can be thrown.
	}

	m_iClip2--;
}
break;
</source>

Now go to the {{Code|highlight=c|int CWeaponSMG1::WeaponRangeAttack2Condition( float flDot, float flDist )}} function and replace it with this:
<source lang="cpp">
int CWeaponSMG1::WeaponRangeAttack2Condition()
</source>

And near the top of the function, comment out <code>return COND_NONE;</code> like so:
<source lang="cpp">
//return COND_NONE;
</source>

For the last step, since this is only cosmetic, go to {{path|src/game/server/hl2/npc_combine|cpp}}.

On line 381, disable the <code>DevWarning</code> (only in case you don't want to see it neither on DEV mode):
<source lang="cpp">
//DevWarning("**Combine Elite Soldier MUST be equipped with AR2\n");
</source>

Between lines 2321 and 2325, you can replace that part of the code with the following, so you no longer hear the AR2 effect when using the SMG1:
<source lang="cpp">
if ( pEvent->event == COMBINE_AE_BEGIN_ALTFIRE )
{
	//We want it to use different sounds depending on the weapon
	if ( FClassnameIs(GetActiveWeapon(), "weapon_ar2") )
	{
		EmitSound( "Weapon_CombineGuard.Special1" );
	}
	else if ( FClassnameIs(GetActiveWeapon(), "weapon_smg1") )
	{
		EmitSound( "Weapon_SMG1.Double" ); 
	}
	else
	{
		EmitSound( "Weapon_CombineGuard.Special1" ); // We let this play by default
	}
	handledEvent = true;
}
</source>

== Restoring [[Dropship]] container gun rotation functionality ==
This bug has been fixed in the 2022 {{steamdeck|1}} update for {{hl2|4}} (and it's episodes), but the SDK 2013 code still remains unfixed.

This is to make it so that the gun on the combine dropship can rotate again

Go to line 898 in {{path|src/game/server/hl2/npc_combinedropship|cpp}} and in the {{Code|highlight=c|Spawn( void )}} function insert the following lines

<source lang="cpp">
// Store spawned container weapon pitch and yaw pose parameters to allow weapon point to the player
m_poseWeapon_Pitch = m_hContainer->LookupPoseParameter( "weapon_pitch" );
m_poseWeapon_Yaw = m_hContainer->LookupPoseParameter( "weapon_yaw" );
</source>

so the <code>Spawn( void )</code> function code fragment will look like this

<source lang="cpp">
m_iMachineGunBaseAttachment = m_hContainer->LookupAttachment( "gun_base" );
// NOTE: gun_ref must have the same position as gun_base, but rotates with the gun
m_iMachineGunRefAttachment = m_hContainer->LookupAttachment( "gun_ref" );
// Store spawned container weapon pitch and yaw pose parameters to allow weapon point to the player
m_poseWeapon_Pitch = m_hContainer->LookupPoseParameter( "weapon_pitch" );
m_poseWeapon_Yaw = m_hContainer->LookupPoseParameter( "weapon_yaw" );
</source>

Go to line 864 in {{path|src/game/server/hl2/npc_combinedropship|cpp}} and in the {{Code|highlight=c|Spawn( void )}} function insert the following lines
<source lang="cpp">
m_poseWeapon_Pitch = -1;
m_poseWeapon_Yaw = -1;
</source>

so the <code>Spawn( void )</code> function code fragment will look like this

<source lang="cpp">
m_iAttachmentTroopDeploy = -1;
m_iAttachmentDeployStart = -1;
m_poseWeapon_Pitch = -1;
m_poseWeapon_Yaw = -1;

// create the correct bin for the ship to carry
switch ( m_iCrateType )
{
case CRATE_ROLLER_HOPPER:
	break;
</source>

Go to line 397 in {{path|src/game/server/hl2/npc_combinedropship|cpp}} and in the {{Code|highlight=c|PopulatePoseParameters( void )}} function add the following lines 
<source lang="cpp">
// Dropship has any kind of container
if ( m_hContainer )
{
	// Restore container weapon pose parameters on load if any found
	m_poseWeapon_Pitch = m_hContainer->LookupPoseParameter( "weapon_pitch" );
	m_poseWeapon_Yaw = m_hContainer->LookupPoseParameter( "weapon_yaw" );
}
</source>

Go to line 392 in {{path|src/game/server/hl2/npc_combinedropship|cpp}} and in the {{Code|highlight=cpp|PopulatePoseParameters( void )}} function remove the following lines
<source lang="cpp">
m_poseWeapon_Pitch		= LookupPoseParameter( "weapon_pitch" );
m_poseWeapon_Yaw		= LookupPoseParameter( "weapon_yaw" );
</source>

so the final <code>PopulatePoseParameters( void )</code> function will look like this

<source lang="cpp">
void	CNPC_CombineDropship::PopulatePoseParameters( void )
{
	if (!m_sbStaticPoseParamsLoaded)
	{
		m_poseBody_Accel		= LookupPoseParameter( "body_accel");
		m_poseBody_Sway			= LookupPoseParameter( "body_sway" );
		m_poseCargo_Body_Accel  = LookupPoseParameter( "cargo_body_accel" );
		m_poseCargo_Body_Sway   = LookupPoseParameter( "cargo_body_sway" );

		m_sbStaticPoseParamsLoaded = true;
	}

	// Dropship has any kind of container
	if ( m_hContainer )
	{
		// Restore container weapon pose parameters on load if any found
		m_poseWeapon_Pitch = m_hContainer->LookupPoseParameter( "weapon_pitch" );
		m_poseWeapon_Yaw = m_hContainer->LookupPoseParameter( "weapon_yaw" );
	}

	BaseClass::PopulatePoseParameters();
}
</source>

Go to line 378 in {{path|src/game/server/hl2/npc_combinedropship|cpp}} and remove the following lines
<source lang="cpp">
int CNPC_CombineDropship::m_poseWeapon_Pitch = 0;
int CNPC_CombineDropship::m_poseWeapon_Yaw = 0;
</source>

Go to line 366 in {{path|src/game/server/hl2/npc_combinedropship|cpp}} and remove trailing <code>,</code> and the following lines
<source lang="cpp">
m_poseWeapon_Pitch, m_poseWeapon_Yaw
</source>

so the code will look like this

<source lang="cpp">
static int m_poseBody_Accel, m_poseBody_Sway, m_poseCargo_Body_Accel, m_poseCargo_Body_Sway;
static bool m_sbStaticPoseParamsLoaded;
</source>

Go to line 346 in {{path|src/game/server/hl2/npc_combinedropship|cpp}} and add the following lines after <code>int			m_iAttachmentDeployStart;</code>
<source lang="cpp">
// Cached container weapon pose parameters
int			m_poseWeapon_Pitch;
int			m_poseWeapon_Yaw;
</source>

so the code will look like this

<source lang="cpp">	
int			m_iAttachmentTroopDeploy;
int			m_iAttachmentDeployStart;

// Cached container weapon pose parameters
int			m_poseWeapon_Pitch;
int			m_poseWeapon_Yaw;
</source>

Now your gun should rotate and shoot again!

== Fixing the acid damage white flash sticking around bug ==

This is a very easy fix, I'm surprised no one has patched this.

Go to {{path|src/game/shared/hl2/hl2_gamerules|cpp}} and at line 209 add <code>DMG_ACID</code>, like so:
<source lang="cpp">
return ( ( iDmgType & ( DMG_PARALYZE | DMG_NERVEGAS | DMG_POISON | DMG_RADIATION | DMG_DROWNRECOVER | DMG_ACID | DMG_SLOWBURN ) ) != 0 );
</source>

And it's fixed. Someone, please spread this knowledge.

== Schrodinger's/Quantum crouch fix ==

See: https://wiki.sourceruns.org/wiki/Schrodinger's_Crouch


Another easy fix. 

Go to {{path|src/game/shared/gamemovement|cpp}} then head over to <code>void CGameMovement::FinishDuck( void )</code> (Line 4194)

At the very top, you should see this:
<source lang="cpp">
if ( player->GetFlags() & FL_DUCKING )
	return;
</source>

Now all you have to do is comment it out, that's it!

== Fixing the NPC not blinking bug ==

NPCs not being able to blink has been a bug for mods ever since the Steampipe update. It was fixed in an update for {{hl2|3.1}} + its Episodes ({{hl2ep1}}/{{hl2ep2}}) on the 26th of September 2019, but the code was never pushed to the {{src13|3.1}} public repo.


Fixing this is as easy as correcting a single line of code.

Go to {{path|src/game/client/c_baseflex|cpp}} then head over to the <code>void C_BaseFlex::SetupWeights( ... )</code> function.

Then at line 1152 correct the following line of code from:
<source lang=cpp>
m_iBlink = AddGlobalFlexController( "UH" );
</source>
to
<source lang=cpp>
m_iBlink = AddGlobalFlexController( "blink" );
</source>

Congratulations! You have successfully fixed NPC blinking, it was as easy as that.

== Fix smooth friction sounds using the incorrect soundhandle ==

Fixes a tiny inconsistency. The bug causes the incorrect sound params to be used.


Go to {{path|src/game/shared/physics_shared|cpp}} then head over to <code>void PhysFrictionSound( ... )</code>

Near the bottom of the function, you should see this line of code within an <code>if</code> statement:
<source lang=cpp>
soundHandle = &psurf->soundhandles.scrapeRough;
</source>

Now all you have to do is change that to this:
<source lang=cpp>
soundHandle = &psurf->soundhandles.scrapeSmooth;
</source>

== Restoring the Combine Soldier's ability to emit pain sounds ==

Go to '''src/game/server/hl2/npc_combine.h''' and find <code>void PainSound( void );</code>

And change it to this:
<source lang=cpp>
void PainSound( const CTakeDamageInfo &info );
</source>

Now head over to {{path|src/game/server/hl2/npc_combine|cpp}} and find <code>void CNPC_Combine::PainSound ( void )</code>

And like before, change it to this:
<source lang=cpp>
void CNPC_Combine::PainSound( const CTakeDamageInfo &info )
</source>

== Restoring ability to disallow player holstering weapons in Multiplayer ==
Everyone knows about this bug, but fix here is very simple, go to src/game/shared/basecombatweapon_shared.h, then remove <code>const</code> at 248 line.

Now it should look like:
<source lang=cpp>
virtual bool			CanHolster( void ) { return TRUE; };		// returns true if the weapon can be holstered
</source>

That's it, now you can use CanHolster for weapons!

== Fix env_sun sprite disappearing in sky when you look at it ==
Yet another famous glitch, fix for it is very easy, go to {{path|src/game/client/glow_overlay|cpp}}, find 162 line then replace zFar * 0.999f; with 0.99f;

Now it should look like:
<source lang=cpp>
Vector pos = CurrentViewOrigin() + m_vDirection * zFar * 0.99f;
</source>

Now env_sun sprite shouldn't disappear when you look at it.

== Fix for viewmodel FOV going into negative integers ==
This glitch is most obvious when using zoom on higher than normal fov's like 120 or 150.
To fix; go to {{path|src/game/client/view|cpp}} and on line 739 change this:
<source lang=cpp>
	//Adjust the viewmodel's FOV to move with any FOV offsets on the viewer's end
	view.fovViewmodel = g_pClientMode->GetViewModelFOV() - flFOVOffset;
</source>
To this:
<source lang=cpp>
	//Adjust the viewmodel's FOV to move with any FOV offsets on the viewer's end
	view.fovViewmodel = fabs( g_pClientMode->GetViewModelFOV() - MIN( flFOVOffset, g_pClientMode->GetViewModelFOV() ) );
</source>
Now viewmodels won't look super wonky when zooming with higher than normal fov's!

[[Category:Snippets]]
[[Category:Bug fixes]]
[[Category:C++]]