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//    notice, this list of conditions and the following disclaimer.
//  * Redistributions in binary form must reproduce the above copyright
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//    contributors may be used to endorse or promote products derived
//    from this software without specific prior written permission.
//
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// Copyright (c) 2018 NVIDIA Corporation. All rights reserved.


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


#ifndef PX_PHYSICS_NX_CLOTHMESHDESC
#define PX_PHYSICS_NX_CLOTHMESHDESC
/** \addtogroup cooking
@{
*/

#include "ExtClothCoreUtilityTypes.h"
#include "PxVec3.h"

#if PX_DOXYGEN == 0
namespace nvidia
{
#endif

/**
\brief Descriptor class for a cloth mesh.

@see PxCooking.cookClothMesh()

*/
class PxClothMeshDesc
{
public:

	/**
	\brief Pointer to first vertex point.
	*/
	PxBoundedData points;

	/**
	\brief Determines whether particle is simulated or static.
	A positive value denotes that the particle is being simulated, zero denotes a static particle.
	This data is used to generate tether and zero stretch constraints.
	If invMasses.data is null, all particles are assumed to be simulated 
	and no tether and zero stretch constraints are being generated.
	*/
	PxBoundedData invMasses;

	/**
	\brief Pointer to the first triangle.

	These are triplets of 0 based indices:
	vert0 vert1 vert2
	vert0 vert1 vert2
	vert0 vert1 vert2
	...

	where vert* is either a 32 or 16 bit unsigned integer. There are a total of 3*count indices.
	The stride determines the byte offset to the next index triple.
	
	This is declared as a void pointer because it is actually either an uint16_t or a uint32_t pointer.
	*/
	PxBoundedData triangles;

	/**
	\brief Pointer to the first quad.

	These are quadruples of 0 based indices:
	vert0 vert1 vert2 vert3
	vert0 vert1 vert2 vert3
	vert0 vert1 vert2 vert3
	...

	where vert* is either a 32 or 16 bit unsigned integer. There are a total of 4*count indices.
	The stride determines the byte offset to the next index quadruple.

	This is declared as a void pointer because it is actually either an uint16_t or a uint32_t pointer.
	*/
	PxBoundedData quads;

	/**
	\brief Flags bits, combined from values of the enum ::PxMeshFlag
	*/
	PxMeshFlags flags;

	/**
	\brief constructor sets to default.
	*/
	PX_INLINE PxClothMeshDesc();
	/**
	\brief (re)sets the structure to the default.	
	*/
	PX_INLINE void setToDefault();
	/**
	\brief Returns true if the descriptor is valid.
	\return True if the current settings are valid
	*/
	PX_INLINE bool isValid() const;
};

PX_INLINE PxClothMeshDesc::PxClothMeshDesc()	//constructor sets to default
{
}

PX_INLINE void PxClothMeshDesc::setToDefault()
{
	*this = PxClothMeshDesc();
}

PX_INLINE bool PxClothMeshDesc::isValid() const
{
	if(points.count < 3) 	//at least 1 trig's worth of points
		return false;
	if(points.count > 0xffff && flags & PxMeshFlag::e16_BIT_INDICES)
		return false;
	if(!points.data)
		return false;
	if(points.stride < sizeof(physx::PxVec3))	//should be at least one point's worth of data
		return false;

	if(invMasses.data && invMasses.stride < sizeof(float))
		return false;
	if(invMasses.data && invMasses.count != points.count)
		return false;

	if (!triangles.count && !quads.count)	// no support for non-indexed mesh
		return false;
	if (triangles.count && !triangles.data)
		return false;
	if (quads.count && !quads.data)
		return false;

	uint32_t indexSize = (flags & PxMeshFlag::e16_BIT_INDICES) ? sizeof(uint16_t) : sizeof(uint32_t);
	if(triangles.count && triangles.stride < indexSize*3) 
		return false; 
	if(quads.count && quads.stride < indexSize*4)
		return false;

	return true;
}

#if PX_DOXYGEN == 0
} // namespace nvidia
#endif

/** @} */
#endif