PxConvexMeshDesc.h

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#ifndef PX_CONVEX_MESH_DESC_H
#define PX_CONVEX_MESH_DESC_H
#include "foundation/PxVec3.h"
#include "foundation/PxFlags.h"
#include "common/PxCoreUtilityTypes.h"
#include "geometry/PxConvexMesh.h"
#include "PxSDFDesc.h"
 
#if !PX_DOXYGEN
namespace physx
{
#endif
struct PxConvexFlag
{
    enum Enum
    {
        e16_BIT_INDICES     =   (1<<0),
 
        eCOMPUTE_CONVEX     =   (1<<1), 
 
        eCHECK_ZERO_AREA_TRIANGLES      =   (1<<2),
 
        eQUANTIZE_INPUT = (1 << 3),
 
        eDISABLE_MESH_VALIDATION = (1 << 4),
 
        ePLANE_SHIFTING = (1 << 5),
 
        eFAST_INERTIA_COMPUTATION = (1 << 6),
 
        eGPU_COMPATIBLE = (1 << 7),
 
        eSHIFT_VERTICES = (1 << 8)
    };
};
 
typedef PxFlags<PxConvexFlag::Enum,PxU16> PxConvexFlags;
PX_FLAGS_OPERATORS(PxConvexFlag::Enum,PxU16)
 
 
class PxConvexMeshDesc
{
public:
 
    PxBoundedData points;
 
    PxBoundedData polygons;
 
    PxBoundedData indices;
 
    PxConvexFlags flags;
 
    PxU16 vertexLimit;
    
    PxU16 polygonLimit;
 
    PxU16 quantizedCount;
 
    PxSDFDesc* sdfDesc;
 
    PX_INLINE PxConvexMeshDesc();
    PX_INLINE void setToDefault();
 
    
    PX_INLINE bool isValid() const;
};
 
PX_INLINE PxConvexMeshDesc::PxConvexMeshDesc()  //constructor sets to default
: vertexLimit(255), polygonLimit(255), quantizedCount(255), sdfDesc(NULL)
{
 
}
 
PX_INLINE void PxConvexMeshDesc::setToDefault()
{
    *this = PxConvexMeshDesc();
}
 
PX_INLINE bool PxConvexMeshDesc::isValid() const
{
    // Check geometry
    if(points.count < 3 ||  //at least 1 trig's worth of points
        (points.count > 0xffff && flags & PxConvexFlag::e16_BIT_INDICES))
        return false;
    if(!points.data)
        return false;
    if(points.stride < sizeof(PxVec3))  //should be at least one point's worth of data
        return false;
    if (quantizedCount < 4)
        return false;
 
    // Check topology
    if(polygons.data)
    {
        if(polygons.count < 4) // we require 2 neighbors for each vertex - 4 polygons at least
            return false;
 
        if(!indices.data) // indices must be provided together with polygons
            return false;
 
        PxU32 limit = (flags & PxConvexFlag::e16_BIT_INDICES) ? sizeof(PxU16) : sizeof(PxU32);
        if(indices.stride < limit) 
            return false;
 
        limit = sizeof(PxHullPolygon);
        if(polygons.stride < limit) 
            return false;
    }
    else
    {
        // We can compute the hull from the vertices
        if(!(flags & PxConvexFlag::eCOMPUTE_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).
    }
 
    if((flags & PxConvexFlag::ePLANE_SHIFTING) &&  vertexLimit < 4)
    {
        return false;
    }
 
    if (!(flags & PxConvexFlag::ePLANE_SHIFTING) && vertexLimit < 8)
    {
        return false;
    }
 
    if(vertexLimit > 255)
    {
        return false;
    }
 
    if (polygonLimit < 4)
    {
        return false;
    }
 
    if (polygonLimit > 255)
    {
        return false;
    }
 
    if (sdfDesc && !sdfDesc->isValid())
    {
        return false;
    }
 
    return true;
}
 
#if !PX_DOXYGEN
} // namespace physx
#endif
 
#endif