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//
//		            Box Box Intersection
//
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#include "CKAll.h"

CKObjectDeclaration	*FillBehaviorBoxBoxIntersectionDecl();
CKERROR CreateBoxBoxIntersectionProto(CKBehaviorPrototype **);
int BoxBoxIntersection(const CKBehaviorContext& behcontext);


CKObjectDeclaration	*FillBehaviorBoxBoxIntersectionDecl()
{
	CKObjectDeclaration *od = CreateCKObjectDeclaration("Box Box Intersection");	
	od->SetDescription("Detects the collision between two 3D entities at the box level.");
	/* rem:
	<SPAN CLASS=in>In: </SPAN>triggers the process.<BR>
	<BR>
	<SPAN CLASS=out>True: </SPAN>is activated if the 2 entities are in intersection.<BR>
	<SPAN CLASS=out>False: </SPAN>is activated if the 2 entities are not in intersection.<BR>
	<BR>
	<SPAN CLASS=pin>Entity 0: </SPAN>first entity to be tested.<BR>
	<SPAN CLASS=pin>Entity 1: </SPAN>second entity to be tested.<BR>
	<SPAN CLASS=pin>Hierarchy 0: </SPAN>specify whether to concider the bounding box of the first entity and its children, or just the bounding box of the first entity.<BR>
	<SPAN CLASS=pin>Hierarchy 1: </SPAN>specify whether to concider the bounding box of the second entity and its children, or just the bounding box of the second entity.<BR>
	<BR>
	This building block detects the collision between two entity's bounding boxes.<BR>
	*/
	/* warning:
	- This building block tells at a given time if the object 1 is touching or not the object 2.<BR>
	If you need to execute this test every 5 rendering process, you should then loop this building block with a 5 frame link.<BR>
	If you need to execute this test at each rendering process, you should then loop this building block with a 1 frame link.<BR>
	*/
	od->SetCategory("Collisions/Intersection");
	od->SetType( CKDLL_BEHAVIORPROTOTYPE);
	od->SetGuid(CKGUID(0x64154401,0x76cf37af));
	od->SetAuthorGuid(VIRTOOLS_GUID);
	od->SetAuthorName("Virtools");
	od->SetVersion(0x00010000);
	od->SetCreationFunction(CreateBoxBoxIntersectionProto);
	od->SetCompatibleClassId(CKCID_BEOBJECT);
	od->NeedManager(COLLISION_MANAGER_GUID);
	return od;
}


CKERROR CreateBoxBoxIntersectionProto(CKBehaviorPrototype **pproto)
{
	CKBehaviorPrototype *proto = CreateCKBehaviorPrototype("Box Box Intersection");
	if(!proto) return CKERR_OUTOFMEMORY;

	proto->DeclareInput("In");

	proto->DeclareOutput("True");
	proto->DeclareOutput("False");
	
	proto->DeclareInParameter("Entity 0",CKPGUID_3DENTITY);
	proto->DeclareInParameter("Entity 1",CKPGUID_3DENTITY);
	proto->DeclareInParameter("Hierarchy 0",CKPGUID_BOOL,"FALSE");
	proto->DeclareInParameter("Hierarchy 1",CKPGUID_BOOL,"FALSE");

	proto->SetFlags(CK_BEHAVIORPROTOTYPE_NORMAL);
	proto->SetFunction(BoxBoxIntersection);

	*pproto = proto;
	return CK_OK;
}



int BoxBoxIntersection(const CKBehaviorContext& behcontext)
{
	CKBehavior* beh = behcontext.Behavior;
	CKContext*	ctx	= behcontext.Context;
	CKCollisionManager* cm = (CKCollisionManager*)ctx->GetManagerByGuid(COLLISION_MANAGER_GUID);

	// Set Input state
	beh->ActivateInput(0,FALSE);
	
	CK3dEntity* ent1 = (CK3dEntity*)beh->GetInputParameterObject(0);
	CK3dEntity* ent2 = (CK3dEntity*)beh->GetInputParameterObject(1);
	if(!ent1 || !ent2) {
		beh->ActivateOutput(1);
		return CKBR_OK;
	}

	BOOL eh1 = FALSE;
	beh->GetInputParameterValue(2,&eh1);
	BOOL eh2 = FALSE;
	beh->GetInputParameterValue(3,&eh2);

	BOOL Collision;
	
	Collision= cm->BoxBoxIntersection(ent1,eh1,TRUE,ent2,eh2,TRUE);

	if (Collision) {
		beh->ActivateOutput(0);
	} else {
		beh->ActivateOutput(1);
	}

	return CKBR_OK;
}