rastertriangle.h

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/*
* Copyright 2016 Autodesk, Inc. All rights reserved.
* Use of this software is subject to the terms of the Autodesk license agreement and any attachments or Appendices thereto provided at the time of installation or download,
* or which otherwise accompanies this software in either electronic or hard copy form, or which is signed by you and accepted by Autodesk.
*/


#pragma once

#include "gwnavruntime/base/endianness.h"
#include "gwnavruntime/navmesh/navmeshtypes.h"
#include "gwnavgeneration/raster/rasterpoint.h"
#include "gwnavruntime/math/vec3f.h"
#include "gwnavruntime/basesystem/intcoordsystem.h"


namespace Kaim
{

class Triangle3i;


class RasterTriangle
{
public:
    RasterTriangle();

    bool Setup(const Triangle3i& triangle, KyFloat32 rasterPrecisionInMeter);

    bool Setup(const RasterPoint& rpA, const RasterPoint& rpB, const RasterPoint& rpC,  KyFloat32 rasterPrecisionInMeter);

    KY_INLINE KyFloat32 meterZ(Coord x, Coord y)
    {
        KyFloat32 meter_AMx = IntCoordSystem::IntToNavigation_Dist(x - iA.x, m_rasterPrecisionInMeter);
        KyFloat32 meter_AMy = IntCoordSystem::IntToNavigation_Dist(y - iA.y, m_rasterPrecisionInMeter);
        return A.z - (meter_AMx * N.x + meter_AMy * N.y) * inv_Nz;
    }

    KyFloat32 meterStepZ_AlongX(Coord dx) { return dz_on_dx * IntCoordSystem::IntToNavigation_Dist(dx, m_rasterPrecisionInMeter); }

    /* Returns true if M is inside triangle or exactly on one edge. */
    bool IsInside2d(const Vec2i& M) const { return M.IsInsideTriangle(iA, iB, iC); }

    /* Returns true if M is inside triangle or exactly on one edge. We assume the triangle is not colinear in this test. */
    bool IsInside2d_NoColinear(const Vec2i& M) const { return M.IsInsideNotColinearTriangle(iA, iB, iC); }

    /* Returns true if M is strictly inside triangle. */
    bool IsStrictlyInside2d(const Vec2i& M) const { return M.IsStrictlyInsideTriangle(iA, iB, iC); }

public:
    Vec2i iA, iB, iC;

    Vec3f A;
    Vec3f AB;
    Vec3f AC;
    Vec3f N;
    KyFloat32 inv_Nz;
    KyFloat32 dz_on_dx;
    KyFloat32 m_rasterPrecisionInMeter;
};


}