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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
* Contains a handy indexed triangle class.
* \file IceIndexedTriangle.h
* \author Pierre Terdiman
* \date January, 17, 2000
*/
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Include Guard
#ifndef __ICEINDEXEDTRIANGLE_H__
#define __ICEINDEXEDTRIANGLE_H__
// Forward declarations
enum CubeIndex;
// An indexed triangle class.
class ICEMATHS_API IndexedTriangle
{
public:
//! Constructor
inline_ IndexedTriangle() {}
//! Constructor
inline_ IndexedTriangle(udword r0, udword r1, udword r2) { mVRef[0]=r0; mVRef[1]=r1; mVRef[2]=r2; }
//! Copy constructor
inline_ IndexedTriangle(const IndexedTriangle& triangle)
{
mVRef[0] = triangle.mVRef[0];
mVRef[1] = triangle.mVRef[1];
mVRef[2] = triangle.mVRef[2];
}
//! Destructor
inline_ ~IndexedTriangle() {}
//! Vertex-references
udword mVRef[3];
// Methods
void Flip();
float Area(const IcePoint* verts) const;
float Perimeter(const IcePoint* verts) const;
float Compacity(const IcePoint* verts) const;
void Normal(const IcePoint* verts, IcePoint& normal) const;
void DenormalizedNormal(const IcePoint* verts, IcePoint& normal) const;
void Center(const IcePoint* verts, IcePoint& center) const;
void CenteredNormal(const IcePoint* verts, IcePoint& normal) const;
void RandomPoint(const IcePoint* verts, IcePoint& random) const;
bool IsVisible(const IcePoint* verts, const IcePoint& source) const;
bool BackfaceCulling(const IcePoint* verts, const IcePoint& source) const;
float ComputeOcclusionPotential(const IcePoint* verts, const IcePoint& view) const;
bool ReplaceVertex(udword oldref, udword newref);
bool IsDegenerate() const;
bool HasVertex(udword ref) const;
bool HasVertex(udword ref, udword* index) const;
ubyte FindEdge(udword vref0, udword vref1) const;
udword OppositeVertex(udword vref0, udword vref1) const;
inline_ udword OppositeVertex(ubyte edgenb) const { return mVRef[2-edgenb]; }
void GetVRefs(ubyte edgenb, udword& vref0, udword& vref1, udword& vref2) const;
float MinEdgeLength(const IcePoint* verts) const;
float MaxEdgeLength(const IcePoint* verts) const;
void ComputePoint(const IcePoint* verts, float u, float v, IcePoint& pt, udword* nearvtx=null) const;
float Angle(const IndexedTriangle& tri, const IcePoint* verts) const;
inline_ IcePlane PlaneEquation(const IcePoint* verts) const { return IcePlane(verts[mVRef[0]], verts[mVRef[1]], verts[mVRef[2]]); }
bool Equal(const IndexedTriangle& tri) const;
CubeIndex ComputeCubeIndex(const IcePoint* verts) const;
};
#endif // __ICEINDEXEDTRIANGLE_H__
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