/**
Update all the entities cerrently existing in the stage.
This function must be called once per frame.
- Basic steps
- 1. Call BaseEntity::UpdateBaseEntity( dt ) for each base entity
- 2. Save positions of copy entities
- 3. Run physics simulator
- 4. Remove terminated entities from the active list
- 5. Call CCopyEntity::Act() for each copy entity except for child entities
- 6. Update link to the entity tree node if an entity has changed its position in Act()
TODO: Do 5 & 6 in a single loop to update link for each entity right after is Act().
Current code does this in separate loops.
*/
void EntityManager::UpdateAllEntities( float dt )
{
CCopyEntity *pEntity = NULL;
CCopyEntity *pPrevEntity = NULL;
CCopyEntity *pTouchedEnt = NULL;
ONCE( LOG_PRINT( " - updating base entities" ) );
size_t i, num_base_entities = m_vecpBaseEntity.size();
for( i=0; i<num_base_entities; i++ )
{
m_vecpBaseEntity[i]->UpdateBaseEntity( dt );
}
// save the current entity positions
for( pEntity = m_pEntityInUse.get();
pEntity != NULL;
pEntity = pEntity->m_pNextRawPtr )
{
pEntity->PrevPosition() = pEntity->GetWorldPosition();
}
// run physics simulator
// entity position may be modified in this call
UpdatePhysics( dt );
ONCE( LOG_PRINT( " - updated physics" ) );
// remove terminated entities from the active entity list
ReleaseTerminatedEntities();
ONCE( LOG_PRINT( " - removed terminated entities from the active entity list" ) );
// update active entities
for( pEntity = this->m_pEntityInUse.get(), pPrevEntity = NULL;
pEntity != NULL;
pPrevEntity = pEntity, pEntity = pEntity->m_pNextRawPtr )
{
// before updating pEntity, check if it has been terminated.
if( !pEntity->inuse )
continue;
// set the results of physics simulation to
// pose, velocity and angular velocity of the entity
// if( pEntity->pPhysicsActor && pEntity->GetEntityFlags() & BETYPE_USE_PHYSSIM_RESULTS )
if( 0 < pEntity->m_vecpPhysicsActor.size() && pEntity->GetEntityFlags() & BETYPE_USE_PHYSSIM_RESULTS )
pEntity->UpdatePhysics();
if( pEntity->sState & CESTATE_ATREST )
continue;
if( !pEntity->m_pParent || !pEntity->m_pParent->inuse )
{
// 'pEntity' has no parent or its parent is already terminated
pEntity->pBaseEntity->Act( pEntity );
}
if( !pEntity->inuse )
continue; // terminated in its own update routine
UpdateEntityAfterMoving( pEntity );
// deal with entities touched during this frame
for(int i=0; i<pEntity->vecpTouchedEntity.size(); i++)
{
pTouchedEnt = pEntity->vecpTouchedEntity[i];
pEntity->pBaseEntity->Touch( pEntity, pTouchedEnt );
if( pTouchedEnt )
pTouchedEnt->pBaseEntity->Touch( pTouchedEnt, pEntity );
}
// clear touched entities for the next frame
pEntity->vecpTouchedEntity.clear();
}
ONCE( LOG_PRINT( " - updated active entities" ) );
// unlink and link the entity in the entity tree if it changed its position
/*
for( pEntity = m_pEntityInUse.get();
pEntity != NULL;
pPrevEntity = pEntity, pEntity = pEntity->m_pNextRawPtr )
{
if( !pEntity->inuse )
continue;
UpdateEntityAfterMoving();
}
*/
}
