effect.cpp

机甲指挥官2源代码

	m_children(NULL),
	m_event(&spec->m_events)
{
	Check_Pointer(this);
	Check_Object(spec);
	Verify(gos_GetCurrentHeap() == Heap);
	m_specification = spec;
	m_age = 0.0f;
	m_flags = flags;
	m_lastRan = -1.0f;
	m_localToParent = Stuff::LinearMatrix4D::Identity;
}


//------------------------------------------------------------------------------
//
gosFX::Effect::~Effect()
{
	Check_Object(this);
	Stuff::ChainIteratorOf<gosFX::Effect*> children(&m_children);
	children.DeletePlugs();
}

//------------------------------------------------------------------------------
//
gosFX::Effect*
	gosFX::Effect::Make(
		Specification *spec,
		unsigned flags
	)
{
	Check_Object(spec);

	gos_PushCurrentHeap(Heap);
	Effect *effect = new gosFX::Effect(DefaultData, spec, flags);
	gos_PopCurrentHeap();

	return effect;
}

//------------------------------------------------------------------------------
//
void
	gosFX::Effect::TestInstance() const
{
	Verify(IsDerivedFrom(DefaultData));
}

//------------------------------------------------------------------------------
//
void
	gosFX::Effect::Start(ExecuteInfo *info)
{
	Check_Object(this);
	Check_Pointer(info);
	gos_PushCurrentHeap(Heap);

	//
	//---------------------------------------------------------------------
	// Don't override m_lastran if we are issuing a Start command while the
	// effect is already running
	//---------------------------------------------------------------------
	//
	if (!IsExecuted() || m_lastRan == -1.0)
		m_lastRan = info->m_time;
	SetExecuteOn();

	//
	//-------------------------------------------
	// If no seed was provided, pick one randomly
	//-------------------------------------------
	//
	m_seed = (info->m_seed == -1.0f) ? Stuff::Random::GetFraction() : info->m_seed;
	Verify(m_seed >= 0.0f && m_seed <= 1.0f);

	//
	//--------------------------------------------------------------------
	// Figure out how long the emitter will live and its initial age based
	// upon the effect seed
	//--------------------------------------------------------------------
	//
	Check_Object(m_specification);
	if (info->m_age == -1.0f)
	{
		Stuff::Scalar lifetime =
			m_specification->m_lifeSpan.ComputeValue(m_seed, 0.0f);
		Min_Clamp(lifetime, 0.033333f);
		m_ageRate = 1.0f / lifetime;
		m_age = 0;
	}
	else
	{
		m_age = info->m_age;
		m_ageRate = info->m_ageRate;
		Verify(m_age >= 0.0f && m_age <= 1.0f);
	}

	//
	//--------------------
	// Set up the matrices
	//--------------------
	//
	Check_Object(info->m_parentToWorld);
	m_localToWorld.Multiply(m_localToParent, *info->m_parentToWorld);

	//
	//-------------------------
	// Set up the event pointer
	//-------------------------
	//
	m_event.First();
	gos_PopCurrentHeap();
}

//------------------------------------------------------------------------------
//
bool gosFX::Effect::Execute(ExecuteInfo *info)
{
	Check_Object(this);
	Check_Pointer(info);
	Verify(IsExecuted());
	gos_PushCurrentHeap(Heap);

	//
	//-----------------------------------------------------
	// If a new seed is provided, override the current seed
	//-----------------------------------------------------
	//
	if (info->m_seed != -1.0f)
	{
		Verify(info->m_seed>=0.0f && info->m_seed<1.0f);
		m_seed = info->m_seed;
	}

	//
	//--------------------------------------------
	// Figure out the new age and clear the bounds
	//--------------------------------------------
	//
	Stuff::Scalar age =
		m_age + static_cast<Stuff::Scalar>(info->m_time - m_lastRan) * m_ageRate;
	Verify(age >= 0.0f && age >= m_age);
	*info->m_bounds = Stuff::OBB::Identity;

	//
	//--------------------------------
	// Update the effectToWorld matrix
	//--------------------------------
	//
	Check_Object(info->m_parentToWorld);
	m_localToWorld.Multiply(m_localToParent, *info->m_parentToWorld);

	//
	//--------------------------------------------------
	// Check to see if the top event needs to be handled
	//--------------------------------------------------
	//
	Check_Object(m_specification);
	Event *event;
	while ((event = m_event.GetCurrent()) != NULL)
	{
		Check_Object(event);
		if (event->m_time > m_age)
			break;

		//
		//-------------------------------------------------------------
		// This event needs to go, so spawn and bump the effect pointer
		//-------------------------------------------------------------
		//
		unsigned flags = ExecuteFlag;
		if ((event->m_flags&SimulationModeMask) == ParentSimulationMode)
		{
			Verify((m_flags&SimulationModeMask) != ParentSimulationMode);
			flags |= m_flags&SimulationModeMask;
		}
		else
			flags |= event->m_flags&SimulationModeMask;

		Effect* effect =
			EffectLibrary::Instance->MakeEffect(
				event->m_effectID,
				flags
			);
		Register_Object(effect);
		m_children.Add(effect);
		m_event.Next();

		//
		//---------------------------------------------
		// Now set the info for starting the new effect
		//---------------------------------------------
		//
		effect->m_localToParent = event->m_localToParent;
		Stuff::Scalar min_seed =
			m_specification->m_minimumChildSeed.ComputeValue(m_age, m_seed);
		Stuff::Scalar seed_range =
			m_specification->m_maximumChildSeed.ComputeValue(m_age, m_seed) - min_seed;
		Stuff::Scalar seed =
			Stuff::Random::GetFraction()*seed_range + min_seed;
		Clamp(seed, 0.0f, 1.0f);
		ExecuteInfo
			local_info(
				info->m_time,
				&m_localToWorld,
				NULL,
				seed
			);
		effect->Start(&local_info);
	}

	//
	//------------------------------------------------------------
	// Execute all the children.  If any of them finish, kill them
	//------------------------------------------------------------
	//
	Stuff::ChainIteratorOf<gosFX::Effect*> children(&m_children);
	gosFX::Effect *child;
	Stuff::OBB child_obb = Stuff::OBB::Identity;
	ExecuteInfo
		child_info(
			info->m_time,
			&m_localToWorld,
			&child_obb
		);
	child_info.m_bounds = &child_obb;
	while ((child = children.ReadAndNext()) != NULL)
	{
		Check_Object(child);
		if (!child->Execute(&child_info))
		{
			Unregister_Object(child);
			delete child;
		}

		//
		//--------------------------------------------------------------
		// Merge the bounding sphere of the child into the bounds of the
		// parent
		//--------------------------------------------------------------
		//
		Stuff::OBB parent_bounds;
		parent_bounds.Multiply(child_obb, m_localToParent);
		info->m_bounds->Union(*info->m_bounds, parent_bounds);
	}

	Check_Object(info->m_bounds);

	//
	//----------------------------------------------------------------------
	// Set the new time, then if we have run the course of the effect, start
	// over if we loop, otherwise wait for our children to finish before
	// killing ourselves
	//----------------------------------------------------------------------
	//
	m_lastRan = info->m_time;
	m_age = age;
	if (m_age >= 1.0f)
	{
		if (IsLooped())
			Start(info);
		else if (HasFinished())
			Kill();
	}

	//
	//----------------------------------
	// Tell our parent if we need to die
	//----------------------------------
	//
	gos_PopCurrentHeap();
	return IsExecuted();
}

//------------------------------------------------------------------------------
//
void gosFX::Effect::Stop()
{
	Check_Object(this);

	//
	//------------------------------------
	// Stop the children then stop ourself
	//------------------------------------
	//
	m_age = 1.0f;
	m_event.Last();
	m_event.Next();
}

//------------------------------------------------------------------------------
//
void gosFX::Effect::Kill()
{
	Check_Object(this);

	//
	//------------------------------------
	// Kill the children then kill ourself
	//------------------------------------
	//
	Stuff::ChainIteratorOf<gosFX::Effect*> children(&m_children);
	gosFX::Effect* child;
	while ((child = children.ReadAndNext()) != NULL)
	{
		Check_Object(child);
		child->Kill();
	}
	SetExecuteOff();
}

//------------------------------------------------------------------------------
//
void gosFX::Effect::Draw(DrawInfo *info)
{
	Check_Object(this);
	Check_Pointer(info);

	//
	//-------------------------------------
	// Make sure all the children get drawn
	//-------------------------------------
	//
	DrawInfo new_info;
	Check_Object(m_specification);
	new_info.m_state.Combine(info->m_state, m_specification->m_state);
	Stuff::LinearMatrix4D local_to_world;
	local_to_world.Multiply(m_localToParent, *info->m_parentToWorld);
	new_info.m_parentToWorld = &local_to_world;
	new_info.m_clipper = info->m_clipper;
	new_info.m_clippingFlags = info->m_clippingFlags;
	Stuff::ChainIteratorOf<gosFX::Effect*> children(&m_children);
	gosFX::Effect *child;
	while ((child = children.ReadAndNext()) != NULL)
	{
		Check_Object(child);
		child->Draw(&new_info);
	}
}

//------------------------------------------------------------------------------
//
bool gosFX::Effect::HasFinished()
{
	Check_Object(this);

	//
	//-------------------------------------------------------------------------
	// An effect is not finished if it is executing and its life hasn't expired
	//-------------------------------------------------------------------------
	//
	if (IsExecuted() && m_age < 1.0f)
		return false;

	//
	//-----------------------------------------------
	// It is also not finished if it has any children
	//-----------------------------------------------
	//
	Stuff::ChainIteratorOf<gosFX::Effect*> children(&m_children);
	return children.GetCurrent() == NULL;
}

//#############################################################################
//##########################    gosFX::Effect__ClassData    ##########################
//#############################################################################

void
	gosFX::Effect__ClassData::TestInstance()
{
	Verify(IsDerivedFrom(gosFX::Effect::DefaultData));
}