Force_Field.cpp

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/*
===========================================================================

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

#include "../Game_local.h"

CLASS_DECLARATION( idForce, idForce_Field )
END_CLASS

/*
================
idForce_Field::idForce_Field
================
*/
idForce_Field::idForce_Field( void ) {
        type                    = FORCEFIELD_UNIFORM;
        applyType               = FORCEFIELD_APPLY_FORCE;
        magnitude               = 0.0f;
        dir.Set( 0, 0, 1 );
        randomTorque    = 0.0f;
        playerOnly              = false;
        monsterOnly             = false;
        clipModel               = NULL;
}

/*
================
idForce_Field::~idForce_Field
================
*/
idForce_Field::~idForce_Field( void ) {
        if ( this->clipModel ) {
                delete this->clipModel;
        }
}

/*
================
idForce_Field::Save
================
*/
void idForce_Field::Save( idSaveGame *savefile ) const {
        savefile->WriteInt( type );
        savefile->WriteInt( applyType);
        savefile->WriteFloat( magnitude );
        savefile->WriteVec3( dir );
        savefile->WriteFloat( randomTorque );
        savefile->WriteBool( playerOnly );
        savefile->WriteBool( monsterOnly );
        savefile->WriteClipModel( clipModel );
}

/*
================
idForce_Field::Restore
================
*/
void idForce_Field::Restore( idRestoreGame *savefile ) {
        savefile->ReadInt( (int &)type );
        savefile->ReadInt( (int &)applyType);
        savefile->ReadFloat( magnitude );
        savefile->ReadVec3( dir );
        savefile->ReadFloat( randomTorque );
        savefile->ReadBool( playerOnly );
        savefile->ReadBool( monsterOnly );
        savefile->ReadClipModel( clipModel );
}

/*
================
idForce_Field::SetClipModel
================
*/
void idForce_Field::SetClipModel( idClipModel *clipModel ) {
        if ( this->clipModel && clipModel != this->clipModel ) {
                delete this->clipModel;
        }
        this->clipModel = clipModel;
}

/*
================
idForce_Field::Uniform
================
*/
void idForce_Field::Uniform( const idVec3 &force ) {
        dir = force;
        magnitude = dir.Normalize();
        type = FORCEFIELD_UNIFORM;
}

/*
================
idForce_Field::Explosion
================
*/
void idForce_Field::Explosion( float force ) {
        magnitude = force;
        type = FORCEFIELD_EXPLOSION;
}

/*
================
idForce_Field::Implosion
================
*/
void idForce_Field::Implosion( float force ) {
        magnitude = force;
        type = FORCEFIELD_IMPLOSION;
}

/*
================
idForce_Field::RandomTorque
================
*/
void idForce_Field::RandomTorque( float force ) {
        randomTorque = force;
}

/*
================
idForce_Field::Evaluate
================
*/
void idForce_Field::Evaluate( int time ) {
        int numClipModels, i;
        idBounds bounds;
        idVec3 force, torque, angularVelocity;
        idClipModel *cm, *clipModelList[ MAX_GENTITIES ];

        assert( clipModel );

        bounds.FromTransformedBounds( clipModel->GetBounds(), clipModel->GetOrigin(), clipModel->GetAxis() );
        numClipModels = gameLocal.clip.ClipModelsTouchingBounds( bounds, -1, clipModelList, MAX_GENTITIES );

        for ( i = 0; i < numClipModels; i++ ) {
                cm = clipModelList[ i ];

                if ( !cm->IsTraceModel() ) {
                        continue;
                }

                idEntity *entity = cm->GetEntity();

                if ( !entity ) {
                        continue;
                }
                
                idPhysics *physics = entity->GetPhysics();

                if ( playerOnly ) {
                        if ( !physics->IsType( idPhysics_Player::Type ) ) {
                                continue;
                        }
                } else if ( monsterOnly ) {
                        if ( !physics->IsType( idPhysics_Monster::Type ) ) {
                                continue;
                        }
                }

                if ( !gameLocal.clip.ContentsModel( cm->GetOrigin(), cm, cm->GetAxis(), -1,
                                                                        clipModel->Handle(), clipModel->GetOrigin(), clipModel->GetAxis() ) ) {
                        continue;
                }

                switch( type ) {
                        case FORCEFIELD_UNIFORM: {
                                force = dir;
                                break;
                        }
                        case FORCEFIELD_EXPLOSION: {
                                force = cm->GetOrigin() - clipModel->GetOrigin();
                                force.Normalize();
                                break;
                        }
                        case FORCEFIELD_IMPLOSION: {
                                force = clipModel->GetOrigin() - cm->GetOrigin();
                                force.Normalize();
                                break;
                        }
                        default: {
                                gameLocal.Error( "idForce_Field: invalid type" );
                                break;
                        }
                }

                if ( randomTorque != 0.0f ) {
                        torque[0] = gameLocal.random.CRandomFloat();
                        torque[1] = gameLocal.random.CRandomFloat();
                        torque[2] = gameLocal.random.CRandomFloat();
                        if ( torque.Normalize() == 0.0f ) {
                                torque[2] = 1.0f;
                        }
                }

                switch( applyType ) {
                        case FORCEFIELD_APPLY_FORCE: {
                                if ( randomTorque != 0.0f ) {
                                        entity->AddForce( gameLocal.world, cm->GetId(), cm->GetOrigin() + torque.Cross( dir ) * randomTorque, dir * magnitude );
                                }
                                else {
                                        entity->AddForce( gameLocal.world, cm->GetId(), cm->GetOrigin(), force * magnitude );
                                }
                                break;
                        }
                        case FORCEFIELD_APPLY_VELOCITY: {
                                physics->SetLinearVelocity( force * magnitude, cm->GetId() );
                                if ( randomTorque != 0.0f ) {
                                        angularVelocity = physics->GetAngularVelocity( cm->GetId() );
                                        physics->SetAngularVelocity( 0.5f * (angularVelocity + torque * randomTorque), cm->GetId() );
                                }
                                break;
                        }
                        case FORCEFIELD_APPLY_IMPULSE: {
                                if ( randomTorque != 0.0f ) {
                                        entity->ApplyImpulse( gameLocal.world, cm->GetId(), cm->GetOrigin() + torque.Cross( dir ) * randomTorque, dir * magnitude );
                                }
                                else {
                                        entity->ApplyImpulse( gameLocal.world, cm->GetId(), cm->GetOrigin(), force * magnitude );
                                }
                                break;
                        }
                        default: {
                                gameLocal.Error( "idForce_Field: invalid apply type" );
                                break;
                        }
                }
        }
}