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// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.  


#ifndef PX_PHYSICS_NX_TRIANGLEMESH_GEOMETRY
#define PX_PHYSICS_NX_TRIANGLEMESH_GEOMETRY
/** \addtogroup geomutils
@{
*/
#include "geometry/PxGeometry.h"
#include "geometry/PxMeshScale.h"
#include "common/PxCoreUtilityTypes.h"

#ifndef PX_DOXYGEN
namespace physx
{
#endif

class PxTriangleMesh;


/**
\brief Some flags to control the simulated behavior of the mesh geometry.

Used in ::PxMeshGeometryFlags.
*/
struct PxMeshGeometryFlag
{
	enum Enum
	{
		eDOUBLE_SIDED				= (1<<1)	//!< The mesh is double-sided. This is currently only used for raycasting.
	};
};

/**
\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 PxConvexMesh object.
*/
class PxTriangleMeshGeometry : public PxGeometry 
{
public:
	PX_INLINE PxTriangleMeshGeometry() : 
		PxGeometry(PxGeometryType::eTRIANGLEMESH), 
		triangleMesh(NULL)
	{ }

	PX_INLINE PxTriangleMeshGeometry(PxTriangleMesh* mesh, 
									 const PxMeshScale& scaling = PxMeshScale(), 
									 PxMeshGeometryFlags flags = PxMeshGeometryFlags()) :
		PxGeometry(PxGeometryType::eTRIANGLEMESH), 
		scale(scaling), 
		meshFlags(flags), 
		triangleMesh(mesh) 
	{ }

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

	\return True if the current settings are valid.
	*/
	PX_INLINE bool isValid() const;

public:
	PxMeshScale			scale;	//!< The scaling transformation.

	PxMeshGeometryFlags	meshFlags;	//!< Some flags to control the simulated behavior of the mesh geometry.
	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.scale.x <= 0.0f || scale.scale.y <= 0.0f || scale.scale.z <= 0.0f)
		return false;
	if (!triangleMesh)
		return false;

	return true;
}

#ifndef PX_DOXYGEN
} // namespace physx
#endif

/** @} */
#endif