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

CKObjectDeclaration	*FillBehaviorFaceFaceIntersectionDecl();
CKERROR CreateFaceFaceIntersectionProto(CKBehaviorPrototype **);
int FaceFaceIntersection(const CKBehaviorContext& behcontext);


CKObjectDeclaration	*FillBehaviorFaceFaceIntersectionDecl()
{
	CKObjectDeclaration *od = CreateCKObjectDeclaration("Face Face Intersection");	
	od->SetDescription("Detects the collision between two 3D entities at the face 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 1: </SPAN>first entity to be tested.<BR>
	<SPAN CLASS=pin>Entity 2: </SPAN>second entity to be tested.<BR>
	<BR>
	This building block detects the collision between each faces of the first entity and each faces of the second entity.<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(0x11426a61,0x1a815584));
	od->SetAuthorGuid(VIRTOOLS_GUID);
	od->SetAuthorName("Virtools");
	od->SetVersion(0x00010000);
	od->SetCreationFunction(CreateFaceFaceIntersectionProto);
	od->SetCompatibleClassId(CKCID_BEOBJECT);
	od->NeedManager(COLLISION_MANAGER_GUID);
	return od;
}


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

	proto->DeclareInput("In");

	proto->DeclareOutput("True");
	proto->DeclareOutput("False");
	
	proto->DeclareInParameter("Entity 1",CKPGUID_3DENTITY);
	proto->DeclareInParameter("Entity 2",CKPGUID_3DENTITY);

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

	*pproto = proto;
	return CK_OK;
}



int FaceFaceIntersection(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 Collision = cm->FaceFaceIntersection(ent1,ent2);

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

	return CKBR_OK;
}