hello world

neo/d3xp/Grabber.cpp

@@ -0,0 +1,735 @@
+/*
+===========================================================================
+
+Doom 3 GPL Source Code
+Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company. 
+
+This file is part of the Doom 3 GPL Source Code (?Doom 3 Source Code?).  
+
+Doom 3 Source Code is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Doom 3 Source Code is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Doom 3 Source Code.  If not, see <http://www.gnu.org/licenses/>.
+
+In addition, the Doom 3 Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 Source Code.  If not, please request a copy in writing from id Software at the address below.
+
+If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
+
+===========================================================================
+*/
+#include "../idlib/precompiled.h"
+#pragma hdrstop
+
+#ifdef _D3XP
+
+#include "Game_local.h"
+#include "Misc.h"
+
+#define MAX_DRAG_TRACE_DISTANCE			384.0f
+#define TRACE_BOUNDS_SIZE				3.f
+#define HOLD_DISTANCE					72.f
+#define FIRING_DELAY					1000.0f
+#define DRAG_FAIL_LEN					64.f
+#define	THROW_SCALE						1000
+#define MAX_PICKUP_VELOCITY				1500 * 1500
+#define MAX_PICKUP_SIZE					96
+
+/*
+===============================================================================
+
+	Allows entities to be dragged through the world with physics.
+
+===============================================================================
+*/
+
+CLASS_DECLARATION( idEntity, idGrabber )
+END_CLASS
+
+/*
+==============
+idGrabber::idGrabber
+==============
+*/
+idGrabber::idGrabber( void ) {
+	dragEnt = NULL;
+	owner = NULL;
+	beam = NULL;
+	beamTarget = NULL;
+	oldUcmdFlags = 0;
+	shakeForceFlip = false;
+	holdingAF = false;
+	endTime = 0;
+	lastFiredTime = -FIRING_DELAY;
+	dragFailTime = 0;
+	startDragTime = 0;
+	warpId = -1;
+	dragTraceDist = MAX_DRAG_TRACE_DISTANCE;
+}
+
+/*
+==============
+idGrabber::~idGrabber
+==============
+*/
+idGrabber::~idGrabber( void ) {
+	StopDrag( true );
+	if ( beam ) {
+		delete beam;
+	}
+	if ( beamTarget ) {
+		delete beamTarget;
+	}
+}
+
+/*
+==============
+idGrabber::Save
+==============
+*/
+void idGrabber::Save( idSaveGame *savefile ) const {
+
+	dragEnt.Save( savefile );
+	savefile->WriteStaticObject( drag );
+
+	savefile->WriteVec3( saveGravity );
+	savefile->WriteInt( id );
+
+	savefile->WriteVec3( localPlayerPoint );
+
+	owner.Save( savefile );
+
+	savefile->WriteBool( holdingAF );
+	savefile->WriteBool( shakeForceFlip );
+
+	savefile->WriteInt( endTime );
+	savefile->WriteInt( lastFiredTime );
+	savefile->WriteInt( dragFailTime );
+	savefile->WriteInt( startDragTime );
+	savefile->WriteFloat( dragTraceDist );
+	savefile->WriteInt( savedContents );
+	savefile->WriteInt( savedClipmask );
+
+	savefile->WriteObject( beam );
+	savefile->WriteObject( beamTarget );
+
+	savefile->WriteInt( warpId );
+}
+
+/*
+==============
+idGrabber::Restore
+==============
+*/
+void idGrabber::Restore( idRestoreGame *savefile ) {
+	//Spawn the beams
+	Initialize();
+
+	dragEnt.Restore( savefile );
+	savefile->ReadStaticObject( drag );
+
+	savefile->ReadVec3( saveGravity );
+	savefile->ReadInt( id );
+
+	// Restore the drag force's physics object
+	if ( dragEnt.IsValid() ) {
+		drag.SetPhysics( dragEnt.GetEntity()->GetPhysics(), id, dragEnt.GetEntity()->GetPhysics()->GetOrigin() );
+	}
+
+	savefile->ReadVec3( localPlayerPoint );
+
+	owner.Restore( savefile );
+
+	savefile->ReadBool( holdingAF );
+	savefile->ReadBool( shakeForceFlip );
+
+	savefile->ReadInt( endTime );
+	savefile->ReadInt( lastFiredTime );
+	savefile->ReadInt( dragFailTime );
+	savefile->ReadInt( startDragTime );
+	savefile->ReadFloat( dragTraceDist );
+	savefile->ReadInt( savedContents );
+	savefile->ReadInt( savedClipmask );
+
+	savefile->ReadObject( reinterpret_cast<idClass *&>(beam) );
+	savefile->ReadObject( reinterpret_cast<idClass *&>(beamTarget) );
+
+	savefile->ReadInt( warpId );
+}
+
+/*
+==============
+idGrabber::Initialize
+==============
+*/
+void idGrabber::Initialize( void ) {
+	if ( !gameLocal.isMultiplayer ) {
+		idDict args;
+
+		if ( !beamTarget ) {
+			args.SetVector( "origin", vec3_origin );
+			args.SetBool( "start_off", true );
+			beamTarget = ( idBeam * )gameLocal.SpawnEntityType( idBeam::Type, &args );
+		}
+
+		if ( !beam ) {
+			args.Clear();
+			args.Set( "target", beamTarget->name.c_str() );
+			args.SetVector( "origin", vec3_origin );
+			args.SetBool( "start_off", true );
+			args.Set( "width", "6" );
+			args.Set( "skin", "textures/smf/flareSizeable" );
+			args.Set( "_color", "0.0235 0.843 0.969 0.2" );
+			beam = ( idBeam * )gameLocal.SpawnEntityType( idBeam::Type, &args );
+			beam->SetShaderParm( 6, 1.0f );
+		}
+
+		endTime = 0;
+		dragTraceDist = MAX_DRAG_TRACE_DISTANCE;
+	}
+	else {
+		beam = NULL;
+		beamTarget = NULL;
+		endTime = 0;
+		dragTraceDist = MAX_DRAG_TRACE_DISTANCE;
+	};
+}
+
+/*
+==============
+idGrabber::SetDragDistance
+==============
+*/
+void idGrabber::SetDragDistance( float dist ) {
+	dragTraceDist = dist;
+}
+
+/*
+==============
+idGrabber::StartDrag
+==============
+*/
+void idGrabber::StartDrag( idEntity *grabEnt, int id ) {
+	int clipModelId = id;
+	idPlayer *thePlayer = owner.GetEntity();
+
+	holdingAF = false;
+	dragFailTime = gameLocal.slow.time;
+	startDragTime = gameLocal.slow.time;
+
+	oldUcmdFlags = thePlayer->usercmd.flags;
+
+	// set grabbed state for networking
+	grabEnt->SetGrabbedState( true );
+
+	// This is the new object to drag around
+	dragEnt = grabEnt;
+
+	// Show the beams!
+	UpdateBeams();
+	if ( beam ) {
+		beam->Show();
+	}
+	if ( beamTarget ) {
+		beamTarget->Show();
+	}
+
+	// Move the object to the fast group (helltime)
+	grabEnt->timeGroup = TIME_GROUP2;
+
+	// Handle specific class types
+	if ( grabEnt->IsType( idProjectile::Type ) ) {
+		idProjectile* p = (idProjectile*)grabEnt;
+
+		p->CatchProjectile( thePlayer, "_catch" );
+
+		// Make the projectile non-solid to other projectiles/enemies (special hack for helltime hunter)
+		if ( !idStr::Cmp( grabEnt->GetEntityDefName(), "projectile_helltime_killer" ) ) {
+			savedContents = CONTENTS_PROJECTILE;
+			savedClipmask = MASK_SHOT_RENDERMODEL|CONTENTS_PROJECTILE;
+		} else {
+			savedContents = grabEnt->GetPhysics()->GetContents();
+			savedClipmask = grabEnt->GetPhysics()->GetClipMask();
+		}
+		grabEnt->GetPhysics()->SetContents( 0 );
+		grabEnt->GetPhysics()->SetClipMask( CONTENTS_SOLID|CONTENTS_BODY );
+
+	} else if ( grabEnt->IsType( idExplodingBarrel::Type ) ) {
+		idExplodingBarrel *ebarrel = static_cast<idExplodingBarrel*>(grabEnt);
+
+		ebarrel->StartBurning();
+
+	} else if ( grabEnt->IsType( idAFEntity_Gibbable::Type ) ) {
+		holdingAF = true;
+		clipModelId = 0;
+
+		if ( grabbableAI( grabEnt->spawnArgs.GetString( "classname" ) ) ) {
+			idAI *aiEnt = static_cast<idAI*>(grabEnt);
+
+			aiEnt->StartRagdoll();
+		}
+	} else if ( grabEnt->IsType( idMoveableItem::Type ) ) {
+		grabEnt->PostEventMS( &EV_Touch, 250, thePlayer, NULL );
+	}
+
+	// Get the current physics object to manipulate
+	idPhysics *phys = grabEnt->GetPhysics();
+
+	// Turn off gravity on object
+	saveGravity = phys->GetGravity();
+	phys->SetGravity( vec3_origin );
+
+	// hold it directly in front of player
+	localPlayerPoint = ( thePlayer->firstPersonViewAxis[0] * HOLD_DISTANCE ) * thePlayer->firstPersonViewAxis.Transpose();
+
+	// Set the ending time for the hold
+	endTime = gameLocal.time + g_grabberHoldSeconds.GetFloat() * 1000;
+
+	// Start up the Force_Drag to bring it in
+	drag.Init( g_grabberDamping.GetFloat() );
+	drag.SetPhysics( phys, clipModelId, thePlayer->firstPersonViewOrigin + localPlayerPoint * thePlayer->firstPersonViewAxis);
+
+	// start the screen warp
+	warpId = thePlayer->playerView.AddWarp( phys->GetOrigin(), SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2, 160, 2000 );
+}
+
+/*
+==============
+idGrabber::StopDrag
+==============
+*/
+void idGrabber::StopDrag( bool dropOnly ) {
+	idPlayer *thePlayer = owner.GetEntity();
+
+	if ( beam ) {
+		beam->Hide();
+	}
+	if ( beamTarget ) {
+		beamTarget->Hide();
+	}
+
+	if ( dragEnt.IsValid() ) {
+		idEntity *ent = dragEnt.GetEntity();
+
+		// set grabbed state for networking
+		ent->SetGrabbedState( false );
+
+		// If a cinematic has started, allow dropped object to think in cinematics
+		if ( gameLocal.inCinematic ) {
+			ent->cinematic = true;
+		}
+
+		// Restore Gravity
+		ent->GetPhysics()->SetGravity( saveGravity );
+
+		// Move the object back to the slow group (helltime)
+		ent->timeGroup = TIME_GROUP1;
+
+		if ( holdingAF ) {
+			idAFEntity_Gibbable *af = static_cast<idAFEntity_Gibbable *>(ent);
+			idPhysics_AF	*af_Phys = static_cast<idPhysics_AF*>(af->GetPhysics());
+
+			if ( grabbableAI( ent->spawnArgs.GetString( "classname" ) ) ) {
+				idAI *aiEnt = static_cast<idAI*>(ent);
+
+				aiEnt->Damage( thePlayer, thePlayer, vec3_origin, "damage_suicide", 1.0f, INVALID_JOINT );
+			}
+			
+			af->SetThrown( !dropOnly );
+
+			// Reset timers so that it isn't forcibly put to rest in mid-air
+			af_Phys->PutToRest();
+			af_Phys->Activate();
+
+			af_Phys->SetTimeScaleRamp( MS2SEC(gameLocal.slow.time) - 1.5f, MS2SEC(gameLocal.slow.time) + 1.0f );
+		}
+
+		// If the object isn't near its goal, just drop it in place.
+		if ( !ent->IsType( idProjectile::Type ) && ( dropOnly || drag.GetDistanceToGoal() > DRAG_FAIL_LEN ) ) {
+			ent->GetPhysics()->SetLinearVelocity( vec3_origin );
+			thePlayer->StartSoundShader( declManager->FindSound( "grabber_maindrop" ), SND_CHANNEL_WEAPON, 0, false, NULL );
+
+			if ( ent->IsType( idExplodingBarrel::Type ) ) {
+				idExplodingBarrel *ebarrel = static_cast<idExplodingBarrel*>(ent);
+
+				ebarrel->SetStability( true );
+				ebarrel->StopBurning();
+			}
+		} else {
+			// Shoot the object forward
+			ent->ApplyImpulse( thePlayer, 0, ent->GetPhysics()->GetOrigin(), thePlayer->firstPersonViewAxis[0] * THROW_SCALE * ent->GetPhysics()->GetMass() );
+			thePlayer->StartSoundShader( declManager->FindSound( "grabber_release" ), SND_CHANNEL_WEAPON, 0, false, NULL );
+
+			// Orient projectiles away from the player
+			if ( ent->IsType( idProjectile::Type ) ) {
+				idPlayer *player = owner.GetEntity();
+				idAngles ang = player->firstPersonViewAxis[0].ToAngles();
+
+				ang.pitch += 90.f;
+				ent->GetPhysics()->SetAxis( ang.ToMat3() );
+				ent->GetPhysics()->SetAngularVelocity( vec3_origin );
+
+				// Restore projectile contents
+				ent->GetPhysics()->SetContents( savedContents );
+				ent->GetPhysics()->SetClipMask( savedClipmask );
+
+			} else if ( ent->IsType( idMoveable::Type ) ) {
+				// Turn on damage for this object
+				idMoveable *obj = static_cast<idMoveable*>(ent);
+				obj->EnableDamage( true, 2.5f );
+				obj->SetAttacker( thePlayer );
+
+				if ( ent->IsType( idExplodingBarrel::Type ) ) {
+					idExplodingBarrel *ebarrel = static_cast<idExplodingBarrel*>(ent);
+					ebarrel->SetStability( false );
+				}
+
+			} else if ( ent->IsType( idMoveableItem::Type ) ) {
+				ent->GetPhysics()->SetClipMask( MASK_MONSTERSOLID );
+			}
+		}
+
+		// Remove the Force_Drag's control of the entity
+		drag.RemovePhysics( ent->GetPhysics() );
+	}
+
+	if ( warpId != -1 ) {
+		thePlayer->playerView.FreeWarp( warpId );
+		warpId = -1;
+	}
+
+	lastFiredTime = gameLocal.time;
+	dragEnt = NULL;
+	endTime = 0;
+}
+
+/*
+==============
+idGrabber::Update
+==============
+*/
+int idGrabber::Update( idPlayer *player, bool hide ) {
+	trace_t trace;
+	idEntity *newEnt;
+
+	// pause before allowing refire
+	if ( lastFiredTime + FIRING_DELAY > gameLocal.time ) {
+		return 3;
+	}
+
+	// Dead players release the trigger
+	if ( hide || player->health <= 0 ) {
+		StopDrag( true );
+		if ( hide ) {
+			lastFiredTime = gameLocal.time - FIRING_DELAY + 250;
+		}
+		return 3;
+	}
+
+	// Check if object being held has been removed (dead demon, projectile, etc.)
+	if ( endTime > gameLocal.time ) {
+		bool abort = !dragEnt.IsValid();
+
+		if ( !abort && dragEnt.GetEntity()->IsType( idProjectile::Type ) ) {
+			idProjectile *proj = (idProjectile *)dragEnt.GetEntity();
+
+			if ( proj->GetProjectileState() >= 3 ) {
+				abort = true;
+			}
+		}
+		if ( !abort && dragEnt.GetEntity()->IsHidden() ) {
+			abort = true;
+		}
+		// Not in multiplayer :: Pressing "reload" lets you carefully drop an item
+		if ( !gameLocal.isMultiplayer && !abort && (( player->usercmd.flags & UCF_IMPULSE_SEQUENCE ) != ( oldUcmdFlags & UCF_IMPULSE_SEQUENCE )) && (player->usercmd.impulse == IMPULSE_13) ) {
+			abort = true;
+		}
+        
+		if ( abort ) {
+			StopDrag( true );
+			return 3;
+		}
+	}
+
+	owner = player;
+
+	// if no entity selected for dragging
+    if ( !dragEnt.GetEntity() ) {
+		idBounds bounds;
+		idVec3 end = player->firstPersonViewOrigin + player->firstPersonViewAxis[0] * dragTraceDist;
+
+		bounds.Zero();
+		bounds.ExpandSelf( TRACE_BOUNDS_SIZE );
+
+		gameLocal.clip.TraceBounds( trace, player->firstPersonViewOrigin, end, bounds, MASK_SHOT_RENDERMODEL|CONTENTS_PROJECTILE|CONTENTS_MOVEABLECLIP, player );
+		// If the trace hit something
+		if ( trace.fraction < 1.0f ) {
+			newEnt = gameLocal.entities[ trace.c.entityNum ];
+
+			// if entity is already being grabbed then bypass
+			if ( gameLocal.isMultiplayer && newEnt->IsGrabbed() ) {
+				return 0;
+			}
+
+			// Check if this is a valid entity to hold
+			if ( newEnt && ( newEnt->IsType( idMoveable::Type ) ||
+					newEnt->IsType( idMoveableItem::Type ) ||
+					newEnt->IsType( idProjectile::Type ) ||
+					newEnt->IsType( idAFEntity_Gibbable::Type ) ) &&
+					newEnt->noGrab == false &&
+					newEnt->GetPhysics()->GetBounds().GetRadius() < MAX_PICKUP_SIZE &&
+					newEnt->GetPhysics()->GetLinearVelocity().LengthSqr() < MAX_PICKUP_VELOCITY ) {
+
+				bool validAF = true;
+
+				if ( newEnt->IsType( idAFEntity_Gibbable::Type ) ) {
+					idAFEntity_Gibbable *afEnt = static_cast<idAFEntity_Gibbable*>(newEnt);
+
+					if ( grabbableAI( newEnt->spawnArgs.GetString( "classname" ) ) ) {
+						// Make sure it's also active
+						if ( !afEnt->IsActive() ) {
+							validAF = false;
+						}
+					} else if ( !afEnt->IsActiveAF() ) {
+						validAF = false;
+					}
+				}
+
+				if ( validAF && player->usercmd.buttons & BUTTON_ATTACK ) {
+					// Grab this entity and start dragging it around
+					StartDrag( newEnt, trace.c.id );
+				} else if ( validAF ) {
+					// A holdable object is ready to be grabbed
+					return 1;
+				}
+			}
+		}
+	}
+
+	// check backwards server time in multiplayer
+	bool allow = true;
+
+	if ( gameLocal.isMultiplayer ) {
+
+		// if we've marched backwards
+		if ( gameLocal.slow.time < startDragTime ) {
+			allow = false;
+		}
+	}
+
+
+	// if there is an entity selected for dragging
+	if ( dragEnt.GetEntity() && allow ) {
+		idPhysics *entPhys = dragEnt.GetEntity()->GetPhysics();
+		idVec3 goalPos;
+
+		// If the player lets go of attack, or time is up
+		if ( !( player->usercmd.buttons & BUTTON_ATTACK ) ) {
+			StopDrag( false );
+			return 3;
+		}
+		if ( gameLocal.time > endTime ) {
+			StopDrag( true );
+			return 3;
+		}
+
+		// Check if the player is standing on the object
+		if ( !holdingAF ) {
+			idBounds	playerBounds;
+			idBounds	objectBounds = entPhys->GetAbsBounds();
+			idVec3		newPoint = player->GetPhysics()->GetOrigin();
+
+			// create a bounds at the players feet
+			playerBounds.Clear();
+			playerBounds.AddPoint( newPoint );
+			newPoint.z -= 1.f;
+			playerBounds.AddPoint( newPoint );
+			playerBounds.ExpandSelf( 8.f );
+
+			// If it intersects the object bounds, then drop it
+			if ( playerBounds.IntersectsBounds( objectBounds ) ) {
+				StopDrag( true );
+				return 3;
+			}
+		}
+
+		// Shake the object at the end of the hold
+		if ( g_grabberEnableShake.GetBool() && !gameLocal.isMultiplayer ) {
+			ApplyShake();
+		}
+
+		// Set and evaluate drag force
+		goalPos = player->firstPersonViewOrigin + localPlayerPoint * player->firstPersonViewAxis;
+
+		drag.SetGoalPosition( goalPos );
+		drag.Evaluate( gameLocal.time );
+
+		// If an object is flying too fast toward the player, stop it hard
+		if ( g_grabberHardStop.GetBool() ) {
+			idPlane theWall;
+			idVec3 toPlayerVelocity, objectCenter;
+			float toPlayerSpeed;
+
+			toPlayerVelocity = -player->firstPersonViewAxis[0];
+			toPlayerSpeed = entPhys->GetLinearVelocity() * toPlayerVelocity;
+
+			if ( toPlayerSpeed > 64.f ) {
+				objectCenter = entPhys->GetAbsBounds().GetCenter();
+
+				theWall.SetNormal( player->firstPersonViewAxis[0] );
+				theWall.FitThroughPoint( goalPos );
+
+				if ( theWall.Side( objectCenter, 0.1f ) == PLANESIDE_BACK ) {
+					int i, num;
+
+					num = entPhys->GetNumClipModels();
+					for ( i=0; i<num; i++ ) {
+						entPhys->SetLinearVelocity( vec3_origin, i );
+					}
+				}
+			}
+
+			// Make sure the object isn't spinning too fast
+			const float MAX_ROTATION_SPEED = 12.f;
+
+			idVec3	angVel = entPhys->GetAngularVelocity();
+			float	rotationSpeed = angVel.LengthFast();
+
+			if ( rotationSpeed > MAX_ROTATION_SPEED ) {
+				angVel.NormalizeFast();
+				angVel *= MAX_ROTATION_SPEED;
+				entPhys->SetAngularVelocity( angVel );
+			}
+		}
+
+		// Orient projectiles away from the player
+		if ( dragEnt.GetEntity()->IsType( idProjectile::Type ) ) {
+			idAngles ang = player->firstPersonViewAxis[0].ToAngles();
+			ang.pitch += 90.f;
+			entPhys->SetAxis( ang.ToMat3() );
+		}
+
+		// Some kind of effect from gun to object?
+		UpdateBeams();
+
+		// If the object is stuck away from its intended position for more than 500ms, let it go.
+		if ( drag.GetDistanceToGoal() > DRAG_FAIL_LEN ) {
+			if ( dragFailTime < (gameLocal.slow.time - 500) ) {
+				StopDrag( true );
+				return 3;
+			}
+		} else {
+			dragFailTime = gameLocal.slow.time;
+		}
+
+		// Currently holding an object
+		return 2;
+	}
+
+	// Not holding, nothing to hold
+	return 0;
+}
+
+/*
+======================
+idGrabber::UpdateBeams
+======================
+*/
+void idGrabber::UpdateBeams( void ) {
+	jointHandle_t	muzzle_joint;
+	idVec3	muzzle_origin;
+	idMat3	muzzle_axis;
+	renderEntity_t *re;
+
+	if ( !beam ) {
+		return;
+	}
+
+	if ( dragEnt.IsValid() ) {
+		idPlayer *thePlayer = owner.GetEntity();
+
+		if ( beamTarget ) {
+			beamTarget->SetOrigin( dragEnt.GetEntity()->GetPhysics()->GetAbsBounds().GetCenter() );
+		}
+
+		muzzle_joint = thePlayer->weapon.GetEntity()->GetAnimator()->GetJointHandle( "particle_upper" );
+		if ( muzzle_joint != INVALID_JOINT ) {
+			thePlayer->weapon.GetEntity()->GetJointWorldTransform( muzzle_joint, gameLocal.time, muzzle_origin, muzzle_axis );
+		} else {
+			muzzle_origin = thePlayer->GetPhysics()->GetOrigin();
+		}
+
+		beam->SetOrigin( muzzle_origin );
+		re = beam->GetRenderEntity();
+		re->origin = muzzle_origin;
+
+		beam->UpdateVisuals();
+		beam->Present();
+	}
+}
+
+/*
+==============
+idGrabber::ApplyShake
+==============
+*/
+void idGrabber::ApplyShake( void ) {
+	float u = 1 - (float)( endTime - gameLocal.time ) / ( g_grabberHoldSeconds.GetFloat() * 1000 );
+
+	if ( u >= 0.8f ) {
+		idVec3 point, impulse;
+		float shakeForceMagnitude = 450.f;
+		float mass = dragEnt.GetEntity()->GetPhysics()->GetMass();
+
+		shakeForceFlip = !shakeForceFlip;
+
+		// get point to rotate around
+		point = dragEnt.GetEntity()->GetPhysics()->GetOrigin();
+		point.y += 1;
+
+		// Articulated figures get less violent shake
+		if ( holdingAF ) {
+			shakeForceMagnitude = 120.f;
+		}
+
+		// calc impulse
+		if ( shakeForceFlip ) {
+			impulse.Set( 0, 0, shakeForceMagnitude * u * mass );
+		}
+		else {
+			impulse.Set( 0, 0, -shakeForceMagnitude * u * mass );
+		}
+
+		dragEnt.GetEntity()->ApplyImpulse( NULL, 0, point, impulse );
+	}
+}
+
+/*
+==============
+idGrabber::grabbableAI
+==============
+*/
+bool idGrabber::grabbableAI( const char *aiName ) {
+	// skip "monster_"
+	aiName += 8;
+
+	if (!idStr::Cmpn( aiName, "flying_lostsoul", 15 ) ||
+		!idStr::Cmpn( aiName, "demon_trite", 11 ) ||
+		!idStr::Cmp( aiName, "flying_forgotten" ) ||
+		!idStr::Cmp( aiName, "demon_cherub" ) ||
+		!idStr::Cmp( aiName, "demon_tick" )) {
+
+		return true;
+	}
+
+	return false;
+}
+
+#endif