#ifndef NX_COLLISION_NXCONVEXMESHDESC
#define NX_COLLISION_NXCONVEXMESHDESC
/*----------------------------------------------------------------------------*\
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|						Public Interface to NovodeX Technology
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|							     www.novodex.com
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\*----------------------------------------------------------------------------*/
/** \addtogroup physics
  @{
*/

#include "NxConvexMesh.h"

/**
\brief Flags which describe the format and behavior of a convex mesh.
*/
enum NxConvexFlags
	{
	/**
	The Nx libraries assume that the face normal of a triangle with vertices [a,b,c] can be computed as:
	edge1 = b-a
	edge2 = c-a
	face_normal = edge1 x edge2.

	Note: this is the same as counterclockwise winding in a right handed graphics coordinate system.

	If this does not match the winding order for your triangles, raise the below flag.
	*/
	NX_CF_FLIPNORMALS		=	(1<<0), //<! Used to flip the normals if the winding order is reversed.
	NX_CF_16_BIT_INDICES	=	(1<<1),	//<! Denotes the use of 16-bit vertex indices
	NX_CF_COMPUTE_CONVEX	=	(1<<2),	//<! Automatically recomputes the hull from the vertices

	/**
	\brief Inflates the convex object according to skin width

	This flag is now assumed by default. 
	
	If the old behavior is required the NX_CF_USE_LEGACY_COOKER flag can be used.

	\note This flag is only used in combination with NX_CF_COMPUTE_CONVEX.

	@see NxCookingParams NX_CF_USE_LEGACY_COOKER
	*/
	NX_CF_INFLATE_CONVEX	=	(1<<3),

	/**
	\brief Uses legacy hull algorithm, which doesn't inflate convex according to skin width

	See NxCookingParams
	*/
	NX_CF_USE_LEGACY_COOKER	=	(1<<4),	//!< Use the legacy convex hull algorithm.
										//!< Note that this is only used in combination with NX_CF_COMPUTE_CONVEX.
	};

typedef NxVec3 NxPoint;

/**
\brief Descriptor class for #NxConvexMesh.

@see NxConvexMesh NxConvexShape NxPhysicsSDK.createConvexMesh()

*/
class NxConvexMeshDesc
	{
	public:

	/**
	\brief Number of vertices.

	<b>Default:</b> 0

	<b>Platform:</b>
	\li PC SW: Yes
	\li PPU  : Yes
	\li PS3  : Yes
	\li XB360: Yes
	*/
	NxU32 numVertices;
	
	/**
	\brief Number of triangles.

	<b>Default:</b> 0

	<b>Platform:</b>
	\li PC SW: Yes
	\li PPU  : Yes
	\li PS3  : Yes
	\li XB360: Yes
	*/
	NxU32 numTriangles;
	
	/**
	\brief Offset between vertex points in bytes.

	<b>Default:</b> 0

	<b>Platform:</b>
	\li PC SW: Yes
	\li PPU  : Yes
	\li PS3  : Yes
	\li XB360: Yes
	*/
	NxU32 pointStrideBytes;
	
	/**
	\brief Offset between triangles in bytes.

	<b>Default:</b> 0

	<b>Platform:</b>
	\li PC SW: Yes
	\li PPU  : Yes
	\li PS3  : Yes
	\li XB360: Yes
	*/
	NxU32 triangleStrideBytes;

	/**
	\brief Pointer to array of vertex positions.
	Pointer to first vertex point. Caller may add pointStrideBytes bytes to the pointer to access the next point.

	<b>Default:</b> NULL

	<b>Platform:</b>
	\li PC SW: Yes
	\li PPU  : Yes
	\li PS3  : Yes
	\li XB360: Yes
	*/
	const void* points;

	/**
	\brief Pointer to array of triangle inices.
	<p>Pointer to first triangle. Caller may add triangleStrideBytes bytes to the pointer to access the next triangle.</p>
	<p><pre>These are triplets of 0 based indices:
	vert0 vert1 vert2
	vert0 vert1 vert2
	vert0 vert1 vert2
	...</pre></p>

	<p>Where vertex is either a 32 or 16 bit unsigned integer. There are numTriangles*3 indices.</p>

	<p>This is declared as a void pointer because it is actually either an NxU16 or a NxU32 pointer.</p>

	<b>Default:</b> NULL

	<b>Platform:</b>
	\li PC SW: Yes
	\li PPU  : Yes
	\li PS3  : Yes
	\li XB360: Yes
	*/
	const void* triangles;

	/**
	\brief Flags bits, combined from values of the enum ::NxConvexFlags

	<b>Default:</b> 0

	<b>Platform:</b>
	\li PC SW: Yes
	\li PPU  : Partial
	\li PS3  : Yes
	\li XB360: Yes
	*/
	NxU32 flags;

	/**
	\brief constructor sets to default.
	*/
	NX_INLINE NxConvexMeshDesc();
	/**
	\brief (re)sets the structure to the default.	
	*/
	NX_INLINE void setToDefault();
	/**
	\brief Returns true if the descriptor is valid.

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

NX_INLINE NxConvexMeshDesc::NxConvexMeshDesc()	//constructor sets to default
	{
	setToDefault();
	}

NX_INLINE void NxConvexMeshDesc::setToDefault()
	{
	numVertices			= 0;
	numTriangles		= 0;
	pointStrideBytes	= 0;
	triangleStrideBytes	= 0;
	points				= NULL;
	triangles			= NULL;
	flags				= 0;
	}

NX_INLINE bool NxConvexMeshDesc::isValid() const
	{
	// Check geometry
	if(numVertices < 3 ||	//at least 1 trig's worth of points
		(numVertices > 0xffff && flags & NX_CF_16_BIT_INDICES))
		return false;
	if(!points)
		return false;
	if(pointStrideBytes < sizeof(NxPoint))	//should be at least one point's worth of data
		return false;

	// Check topology
	// The triangles pointer is not mandatory: the vertex cloud is enough to define the convex hull.
	if(triangles)
		{
		// Indexed mesh
		if(numTriangles < 2)	//some algos require at least 2 trigs
			return false;
		if(flags & NX_CF_16_BIT_INDICES)
			{
			if((triangleStrideBytes < sizeof(NxU16)*3))
				return false;
			}
		else
			{
			if((triangleStrideBytes < sizeof(NxU32)*3))
				return false;
			}
		}
	else
		{
		// We can compute the hull from the vertices
		if(!(flags & NX_CF_COMPUTE_CONVEX))
			return false;	// If the mesh is convex and we're not allowed to compute the hull,
							// you have to provide it completely (geometry & topology).
		}
	return true;
	}


/** \cond */
//#ifdef NX_SUPPORT_INTERNAL_FACES
/**
<p>Descriptor class for NxConvexMesh.</p>

<p>This version is used when the user can provide his own set of already-computed hull polygons. This also makes it
possible to mark each polygon as internal or not (which would have been painful to do with the original desc since
polygons are not explicitly defined there)</p>
*/
class NxConvexMeshDesc2
	{
	public:
	NxU32 numVertices;			//!< Number of vertices.
	NxU32 numPolygons;			//!< Number of convex polygons.

	/**
	\brief Pointer to array of vertex positions.
	Pointer to first vertex point. Caller may add pointStrideBytes bytes to the pointer to access the next point.
	*/
	const void* points;

	/**
	<p>Polygon counts and indices(there are numPolygons polygons).</p>

	<p>
	<pre>Format:-
		Polygon 1 Index Count (NxU32)
		Index 0 (NxU32)
		Index 1
		...
		Polygon 2 Index Count
		Index 0 
		Index 1
		...</pre>
	</p>

	*/
	const NxU32* polygons;

	/**
	Internal flags relating to the this convex mesh.
	*/
	const bool* internalFlags;

	/**
	constructor sets to default.
	*/
	NX_INLINE NxConvexMeshDesc2();
	/**
	(re)sets the structure to the default.	
	*/
	NX_INLINE void setToDefault();
	/**
	returns true if the current settings are valid
	*/
	NX_INLINE bool isValid() const;
	};

NX_INLINE NxConvexMeshDesc2::NxConvexMeshDesc2()	//constructor sets to default
	{
	setToDefault();
	}

NX_INLINE void NxConvexMeshDesc2::setToDefault()
	{
	numVertices		= 0;
	numPolygons		= 0;
	points			= NULL;
	polygons		= NULL;
	internalFlags	= NULL;
	}

NX_INLINE bool NxConvexMeshDesc2::isValid() const
	{
	return true;
	}
//#endif
/** \endcond */

/** @} */
#endif


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