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#ifndef PX_TRIANGLE_MESH_GEOMETRY_H
#define PX_TRIANGLE_MESH_GEOMETRY_H
#include "geometry/PxGeometry.h"
#include "geometry/PxMeshScale.h"
#include "common/PxCoreUtilityTypes.h"

#if !PX_DOXYGEN
namespace physx
{
#endif

class PxTriangleMesh;

/**
\brief Flags controlling the simulated behavior of the triangle mesh geometry.

Used in ::PxMeshGeometryFlags.
*/
struct PxMeshGeometryFlag
{
	enum Enum
	{
		eTIGHT_BOUNDS = (1<<0),	//!< Use tighter (but more expensive to compute) bounds around the triangle mesh geometry.
		eDOUBLE_SIDED = (1<<1)	//!< Meshes with this flag set are treated as double-sided.
								//!< This flag is currently only used for raycasts and sweeps. It is ignored for overlap queries and has no effect on contact generation, i.e. simulation.
								//!< For detailed specifications of this flag for meshes and heightfields please refer to the Geometry Query section of the user guide.
								//!< For double-sided collision meshes, consider duplicating their faces with flipped normals.
	};
};

/**
\brief collection of set bits defined in PxMeshGeometryFlag.

\see PxMeshGeometryFlag
*/
typedef PxFlags<PxMeshGeometryFlag::Enum,PxU8> PxMeshGeometryFlags;
PX_FLAGS_OPERATORS(PxMeshGeometryFlag::Enum,PxU8)

/**
\brief Triangle mesh geometry class.

This class unifies a mesh object with a scaling transform, and 
lets the combined object be used anywhere a PxGeometry is needed.

The scaling is a transform along arbitrary axes contained in the scale object.
The vertices of the mesh in geometry (or shape) space is the 
PxMeshScale::toMat33() transform, multiplied by the vertex space vertices 
in the PxTriangleMeshGeometry object.
*/
class PxTriangleMeshGeometry : public PxGeometry 
{
public:
	/**
	\brief Constructor. By default creates an empty object with a NULL mesh and identity scale.

	\param[in] mesh		Mesh pointer. May be NULL, though this will not make the object valid for shape construction.
	\param[in] scaling	Scale factor.
	\param[in] flags	Mesh flags.
	*/
	PX_INLINE PxTriangleMeshGeometry(	PxTriangleMesh* mesh = NULL,
										const PxMeshScale& scaling = PxMeshScale(),
										PxMeshGeometryFlags flags = PxMeshGeometryFlags()) :
		PxGeometry	(PxGeometryType::eTRIANGLEMESH),
		scale		(scaling),
		meshFlags	(flags),
		triangleMesh(mesh)
	{}

	/**
	\brief Copy constructor.

	\param[in] that		Other object
	*/
	PX_INLINE PxTriangleMeshGeometry(const PxTriangleMeshGeometry& that) :
		PxGeometry	(that),
		scale		(that.scale),
		meshFlags	(that.meshFlags),
		triangleMesh(that.triangleMesh)
	{}

	/**
	\brief Assignment operator
	*/
	PX_INLINE void operator=(const PxTriangleMeshGeometry& that)
	{
		mType = that.mType;
		scale = that.scale;
		meshFlags = that.meshFlags;
		triangleMesh = that.triangleMesh;
	}

	/**
	\brief Returns true if the geometry is valid.

	\return  True if the current settings are valid for shape creation.

	\note A valid triangle mesh has a positive scale value in each direction (scale.scale.x > 0, scale.scale.y > 0, scale.scale.z > 0).
	It is illegal to call PxPhysics::createShape with a triangle mesh that has zero extents in any direction.

	\see PxPhysics::createShape
	*/
	PX_INLINE bool isValid() const;

public:
	PxMeshScale			scale;				//!< The scaling transformation.
	PxMeshGeometryFlags	meshFlags;			//!< Mesh flags.
	PxPadding<3>		paddingFromFlags;	//!< padding for mesh flags
	PxTriangleMesh*		triangleMesh;		//!< A reference to the mesh object.
};

PX_INLINE bool PxTriangleMeshGeometry::isValid() const
{
	if(mType != PxGeometryType::eTRIANGLEMESH)
		return false;
	if(!scale.scale.isFinite() || !scale.rotation.isUnit())
		return false;
	if(!scale.isValidForTriangleMesh())
		return false;
	if(!triangleMesh)
		return false;

	return true;
}

#if !PX_DOXYGEN
} // namespace physx
#endif

#endif
