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350 lines
10 KiB
350 lines
10 KiB
//========= Copyright © 1996-2005, Valve Corporation, All rights reserved. ============// |
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// |
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// Purpose: Implements a screen shake effect that can also shake physics objects. |
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// |
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// NOTE: UTIL_ScreenShake() will only shake players who are on the ground |
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// |
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// $NoKeywords: $ |
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//=============================================================================// |
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// Alien Swarm version, works on player's marine position instead of player position |
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#include "cbase.h" |
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#include "shake.h" |
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#include "physics_saverestore.h" |
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#include "rope.h" |
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#include "asw_util_shared.h" |
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// memdbgon must be the last include file in a .cpp file!!! |
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#include "tier0/memdbgon.h" |
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class CASWPhysicsShake : public IMotionEvent |
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{ |
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DECLARE_SIMPLE_DATADESC(); |
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public: |
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virtual simresult_e Simulate( IPhysicsMotionController *pController, IPhysicsObject *pObject, float deltaTime, Vector &linear, AngularImpulse &angular ) |
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{ |
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Vector contact; |
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if ( !pObject->GetContactPoint( &contact, NULL ) ) |
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return SIM_NOTHING; |
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// fudge the force a bit to make it more dramatic |
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pObject->CalculateForceOffset( m_force * (1.0f + pObject->GetMass()*0.4f), contact, &linear, &angular ); |
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return SIM_LOCAL_FORCE; |
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} |
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Vector m_force; |
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}; |
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BEGIN_SIMPLE_DATADESC( CASWPhysicsShake ) |
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DEFINE_FIELD( m_force, FIELD_VECTOR ), |
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END_DATADESC() |
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class CASWEnvShake : public CPointEntity |
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{ |
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private: |
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float m_Amplitude; |
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float m_Frequency; |
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float m_Duration; |
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float m_Radius; // radius of 0 means all players |
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float m_stopTime; |
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float m_nextShake; |
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float m_currentAmp; |
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Vector m_maxForce; |
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IPhysicsMotionController *m_pShakeController; |
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CASWPhysicsShake m_shakeCallback; |
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DECLARE_DATADESC(); |
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public: |
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DECLARE_CLASS( CASWEnvShake, CPointEntity ); |
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~CASWEnvShake( void ); |
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virtual void Spawn( void ); |
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virtual void OnRestore( void ); |
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inline float Amplitude( void ) { return m_Amplitude; } |
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inline float Frequency( void ) { return m_Frequency; } |
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inline float Duration( void ) { return m_Duration; } |
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inline float Radius( void ) { return m_Radius; } |
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inline void SetAmplitude( float amplitude ) { m_Amplitude = amplitude; } |
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inline void SetFrequency( float frequency ) { m_Frequency = frequency; } |
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inline void SetDuration( float duration ) { m_Duration = duration; } |
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inline void SetRadius( float radius ) { m_Radius = radius; } |
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// Input handlers |
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void InputStartShake( inputdata_t &inputdata ); |
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void InputStopShake( inputdata_t &inputdata ); |
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void InputAmplitude( inputdata_t &inputdata ); |
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void InputFrequency( inputdata_t &inputdata ); |
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// Causes the camera/physics shakes to happen: |
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void ApplyShake( ShakeCommand_t command ); |
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void Think( void ); |
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}; |
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LINK_ENTITY_TO_CLASS( asw_env_shake, CASWEnvShake ); |
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BEGIN_DATADESC( CASWEnvShake ) |
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DEFINE_KEYFIELD( m_Amplitude, FIELD_FLOAT, "amplitude" ), |
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DEFINE_KEYFIELD( m_Frequency, FIELD_FLOAT, "frequency" ), |
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DEFINE_KEYFIELD( m_Duration, FIELD_FLOAT, "duration" ), |
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DEFINE_KEYFIELD( m_Radius, FIELD_FLOAT, "radius" ), |
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DEFINE_FIELD( m_stopTime, FIELD_TIME ), |
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DEFINE_FIELD( m_nextShake, FIELD_TIME ), |
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DEFINE_FIELD( m_currentAmp, FIELD_FLOAT ), |
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DEFINE_FIELD( m_maxForce, FIELD_VECTOR ), |
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DEFINE_PHYSPTR( m_pShakeController ), |
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DEFINE_EMBEDDED( m_shakeCallback ), |
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DEFINE_INPUTFUNC( FIELD_VOID, "StartShake", InputStartShake ), |
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DEFINE_INPUTFUNC( FIELD_VOID, "StopShake", InputStopShake ), |
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DEFINE_INPUTFUNC( FIELD_FLOAT, "Amplitude", InputAmplitude ), |
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DEFINE_INPUTFUNC( FIELD_FLOAT, "Frequency", InputFrequency ), |
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END_DATADESC() |
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#define SF_ASW_SHAKE_EVERYONE 0x0001 // Don't check radius |
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#define SF_ASW_SHAKE_INAIR 0x0004 // Shake players in air |
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#define SF_ASW_SHAKE_PHYSICS 0x0008 // Shake physically (not just camera) |
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#define SF_ASW_SHAKE_ROPES 0x0010 // Shake ropes too. |
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#define SF_ASW_SHAKE_NO_VIEW 0x0020 // DON'T shake the view (only ropes and/or physics objects) |
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//----------------------------------------------------------------------------- |
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// Purpose: Destructor. |
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//----------------------------------------------------------------------------- |
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CASWEnvShake::~CASWEnvShake( void ) |
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{ |
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if ( m_pShakeController ) |
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{ |
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physenv->DestroyMotionController( m_pShakeController ); |
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} |
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} |
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//----------------------------------------------------------------------------- |
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// Purpose: Sets default member values when spawning. |
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//----------------------------------------------------------------------------- |
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void CASWEnvShake::Spawn( void ) |
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{ |
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SetSolid( SOLID_NONE ); |
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SetMoveType( MOVETYPE_NONE ); |
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if ( GetSpawnFlags() & SF_ASW_SHAKE_EVERYONE ) |
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{ |
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m_Radius = 0; |
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} |
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if ( HasSpawnFlags( SF_ASW_SHAKE_NO_VIEW ) && !HasSpawnFlags( SF_ASW_SHAKE_PHYSICS ) && !HasSpawnFlags( SF_ASW_SHAKE_ROPES ) ) |
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{ |
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DevWarning( "env_shake %s with \"Don't shake view\" spawnflag set without \"Shake physics\" or \"Shake ropes\" spawnflags set.", GetDebugName() ); |
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} |
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} |
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//----------------------------------------------------------------------------- |
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// Purpose: Restore the motion controller |
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//----------------------------------------------------------------------------- |
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void CASWEnvShake::OnRestore( void ) |
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{ |
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BaseClass::OnRestore(); |
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if ( m_pShakeController ) |
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{ |
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m_pShakeController->SetEventHandler( &m_shakeCallback ); |
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} |
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} |
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//----------------------------------------------------------------------------- |
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// Purpose: |
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//----------------------------------------------------------------------------- |
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void CASWEnvShake::ApplyShake( ShakeCommand_t command ) |
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{ |
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if ( !HasSpawnFlags( SF_ASW_SHAKE_NO_VIEW ) ) |
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{ |
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bool air = (GetSpawnFlags() & SF_ASW_SHAKE_INAIR) ? true : false; |
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UTIL_ASW_ScreenShake( GetAbsOrigin(), Amplitude(), Frequency(), Duration(), Radius(), command, air ); |
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} |
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if ( GetSpawnFlags() & SF_ASW_SHAKE_ROPES ) |
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{ |
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CRopeKeyframe::ShakeRopes( GetAbsOrigin(), Radius(), Frequency() ); |
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} |
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if ( GetSpawnFlags() & SF_ASW_SHAKE_PHYSICS ) |
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{ |
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if ( !m_pShakeController ) |
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{ |
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m_pShakeController = physenv->CreateMotionController( &m_shakeCallback ); |
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} |
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// do physics shake |
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switch( command ) |
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{ |
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case SHAKE_START: |
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{ |
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m_stopTime = gpGlobals->curtime + Duration(); |
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m_nextShake = 0; |
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m_pShakeController->ClearObjects(); |
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SetNextThink( gpGlobals->curtime ); |
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m_currentAmp = Amplitude(); |
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CBaseEntity *list[1024]; |
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float radius = Radius(); |
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// probably checked "Shake Everywhere" do a big radius |
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if ( !radius ) |
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{ |
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radius = MAX_COORD_INTEGER; |
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} |
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Vector extents = Vector(radius, radius, radius); |
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Vector mins = GetAbsOrigin() - extents; |
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Vector maxs = GetAbsOrigin() + extents; |
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int count = UTIL_EntitiesInBox( list, 1024, mins, maxs, 0 ); |
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for ( int i = 0; i < count; i++ ) |
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{ |
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// |
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// Only shake physics entities that players can see. This is one frame out of date |
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// so it's possible that we could miss objects if a player changed PVS this frame. |
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// |
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if ( ( list[i]->GetMoveType() == MOVETYPE_VPHYSICS ) ) |
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{ |
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IPhysicsObject *pPhys = list[i]->VPhysicsGetObject(); |
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if ( pPhys && pPhys->IsMoveable() ) |
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{ |
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m_pShakeController->AttachObject( pPhys, false ); |
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pPhys->Wake(); |
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} |
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} |
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} |
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} |
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break; |
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case SHAKE_STOP: |
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m_pShakeController->ClearObjects(); |
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break; |
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case SHAKE_AMPLITUDE: |
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m_currentAmp = Amplitude(); |
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case SHAKE_FREQUENCY: |
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m_pShakeController->WakeObjects(); |
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break; |
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} |
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} |
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} |
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//----------------------------------------------------------------------------- |
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// Purpose: Input handler that starts the screen shake. |
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//----------------------------------------------------------------------------- |
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void CASWEnvShake::InputStartShake( inputdata_t &inputdata ) |
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{ |
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ApplyShake( SHAKE_START ); |
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} |
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//----------------------------------------------------------------------------- |
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// Purpose: Input handler that stops the screen shake. |
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//----------------------------------------------------------------------------- |
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void CASWEnvShake::InputStopShake( inputdata_t &inputdata ) |
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{ |
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ApplyShake( SHAKE_STOP ); |
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} |
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//----------------------------------------------------------------------------- |
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// Purpose: Handles changes to the shake amplitude from an external source. |
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//----------------------------------------------------------------------------- |
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void CASWEnvShake::InputAmplitude( inputdata_t &inputdata ) |
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{ |
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SetAmplitude( inputdata.value.Float() ); |
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ApplyShake( SHAKE_AMPLITUDE ); |
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} |
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//----------------------------------------------------------------------------- |
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// Purpose: Handles changes to the shake frequency from an external source. |
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//----------------------------------------------------------------------------- |
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void CASWEnvShake::InputFrequency( inputdata_t &inputdata ) |
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{ |
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SetFrequency( inputdata.value.Float() ); |
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ApplyShake( SHAKE_FREQUENCY ); |
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} |
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//----------------------------------------------------------------------------- |
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// Purpose: Calculates the physics shake values |
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//----------------------------------------------------------------------------- |
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void CASWEnvShake::Think( void ) |
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{ |
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int i; |
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if ( gpGlobals->curtime > m_nextShake ) |
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{ |
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// Higher frequency means we recalc the extents more often and perturb the display again |
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m_nextShake = gpGlobals->curtime + (1.0f / Frequency()); |
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// Compute random shake extents (the shake will settle down from this) |
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for (i = 0; i < 2; i++ ) |
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{ |
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m_maxForce[i] = random->RandomFloat( -1, 1 ); |
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} |
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// make the force it point mostly up |
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m_maxForce.z = 4; |
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VectorNormalize( m_maxForce ); |
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m_maxForce *= m_currentAmp * 400; // amplitude is the acceleration of a 100kg object |
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} |
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float fraction = ( m_stopTime - gpGlobals->curtime ) / Duration(); |
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if ( fraction < 0 ) |
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{ |
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m_pShakeController->ClearObjects(); |
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return; |
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} |
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float freq = 0; |
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// Ramp up frequency over duration |
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if ( fraction ) |
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{ |
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freq = (Frequency() / fraction); |
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} |
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// square fraction to approach zero more quickly |
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fraction *= fraction; |
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// Sine wave that slowly settles to zero |
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fraction = fraction * sin( gpGlobals->curtime * freq ); |
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// Add to view origin |
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for ( i = 0; i < 3; i++ ) |
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{ |
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// store the force in the controller callback |
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m_shakeCallback.m_force[i] = m_maxForce[i] * fraction; |
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} |
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// Drop amplitude a bit, less for higher frequency shakes |
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m_currentAmp -= m_currentAmp * ( gpGlobals->frametime / (Duration() * Frequency()) ); |
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SetNextThink( gpGlobals->curtime ); |
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} |
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//------------------------------------------------------------------------------ |
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// Purpose: Console command to cause a screen shake. |
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//------------------------------------------------------------------------------ |
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void CC_ASW_Shake( void ) |
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{ |
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CBasePlayer *pPlayer = UTIL_GetCommandClient(); |
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if (pPlayer) |
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{ |
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UTIL_ASW_ScreenShake( pPlayer->WorldSpaceCenter(), 25.0, 150.0, 1.0, 750, SHAKE_START ); |
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} |
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} |
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static ConCommand asw_shake("asw_shake", CC_ASW_Shake, "Shake the screen.", FCVAR_CHEAT );
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