GuBarycentricCoordinates.h

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#ifndef GU_BARYCENTRIC_COORDINATES_H
#define GU_BARYCENTRIC_COORDINATES_H
 
#include "common/PxPhysXCommonConfig.h"
#include "foundation/PxVecMath.h"
 
namespace physx
{
namespace Gu
{
    //calculate the barycentric coorinates for a point in a segment
    void barycentricCoordinates(const aos::Vec3VArg p, 
        const aos::Vec3VArg a, 
        const aos::Vec3VArg b, 
        aos::FloatV& v);
 
    //calculate the barycentric coorinates for a point in a triangle
    void barycentricCoordinates(const aos::Vec3VArg p, 
        const aos::Vec3VArg a, 
        const aos::Vec3VArg b, 
        const aos::Vec3VArg c, 
        aos::FloatV& v, 
        aos::FloatV& w);
 
    void barycentricCoordinates(const aos::Vec3VArg v0, 
        const aos::Vec3VArg v1, 
        const aos::Vec3VArg v2,  
        aos::FloatV& v, 
        aos::FloatV& w);
 
    PX_INLINE aos::BoolV isValidTriangleBarycentricCoord(const aos::FloatVArg v, const aos::FloatVArg w)
    {
        using namespace aos;
        const FloatV zero = FNeg(FEps());
        const FloatV one = FAdd(FOne(), FEps());
 
        const BoolV con0 = BAnd(FIsGrtrOrEq(v, zero), FIsGrtrOrEq(one, v));
        const BoolV con1 = BAnd(FIsGrtrOrEq(w, zero), FIsGrtrOrEq(one, w));
        const BoolV con2 = FIsGrtr(one, FAdd(v, w));
        return BAnd(con0, BAnd(con1, con2));
    }
 
    PX_INLINE aos::BoolV isValidTriangleBarycentricCoord2(const aos::Vec4VArg vwvw)
    {
        using namespace aos;
        const Vec4V eps = V4Splat(FEps());
        const Vec4V zero =V4Neg(eps);
        const Vec4V one = V4Add(V4One(), eps);
 
        const Vec4V v0v1v0v1 = V4PermXZXZ(vwvw);
        const Vec4V w0w1w0w1 = V4PermYWYW(vwvw);
 
        const BoolV con0 = BAnd(V4IsGrtrOrEq(v0v1v0v1, zero), V4IsGrtrOrEq(one, v0v1v0v1));
        const BoolV con1 = BAnd(V4IsGrtrOrEq(w0w1w0w1, zero), V4IsGrtrOrEq(one, w0w1w0w1));
        const BoolV con2 = V4IsGrtr(one, V4Add(v0v1v0v1, w0w1w0w1));
        return BAnd(con0, BAnd(con1, con2));
    }
 
} // namespace Gu
 
}
 
#endif