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#include "GuConvexUtilsInternal.h"

#include "foundation/PxBounds3.h"
#include "CmScaling.h"
#include "GuBoxConversion.h"
#include "PxConvexMeshGeometry.h"
#include "GuConvexMesh.h"

using namespace physx;
using namespace Gu;

void Gu::computeHullOBB(Box& hullOBB, const PxBounds3& hullAABB, float offset, 
						const Cm::Matrix34& convexPose, 
						const Cm::Matrix34& meshPose, const Cm::FastVertex2ShapeScaling& meshScaling, bool idtScaleMesh)
{
	// transform bounds = mesh space
	Cm::Matrix34 m0to1 = meshPose.transformTranspose(convexPose);

	hullOBB.extents = hullAABB.getExtents() + PxVec3(offset);
	hullOBB.center = m0to1.transform(hullAABB.getCenter());
	hullOBB.rot = m0to1.m;
	
	if(!idtScaleMesh)
		meshScaling.transformQueryBounds(hullOBB.center, hullOBB.extents, hullOBB.rot);
}

void Gu::computeVertexSpaceOBB(Box& dst, const Box& src, const PxTransform& meshPose, const PxMeshScale& meshScale)
{
	// AP scaffold failure in x64 debug in GuConvexUtilsInternal.cpp
	//PX_ASSERT("Performance warning - this path shouldn't execute for identity mesh scale." && !meshScale.isIdentity());

	dst = transform(meshScale.getInverse() * Cm::Matrix34(meshPose.getInverse()), src);
}

void Gu::computeOBBAroundConvex(
	Box& obb, const PxConvexMeshGeometry& convexGeom, const PxConvexMesh* cm, const PxTransform& convexPose)
{
	const CenterExtents& aabb = static_cast<const Gu::ConvexMesh*>(cm)->getLocalBoundsFast();

	if(convexGeom.scale.isIdentity())
	{
		const PxMat33 m(convexPose.q);
		obb = Gu::Box(m.transform(aabb.mCenter) + convexPose.p, aabb.mExtents, m);
	}
	else
	{
		obb = transform(Cm::Matrix34(convexPose) * convexGeom.scale.toMat33(), Box(aabb.mCenter, aabb.mExtents, PxMat33(PxIdentity)));
	}
}