edgerasterizer.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/navmesh/navmeshtypes.h"


namespace Kaim
{

class GeneratorSystem;
class Box2i;
class RasterPoint;
class SingleStageRaster;


class EdgeRasterizer
{
public:
    EdgeRasterizer(GeneratorSystem* sys, KyFloat32 rasterPrecision, KyInt32 pixelSizeInInt, SingleStageRaster* singleStageRaster);

    bool InitToRasterizeAlong_X(const RasterPoint& A, const RasterPoint& B);

    bool InitToRasterizeAlong_Y(const RasterPoint& A, const RasterPoint& B);

    void Rasterize();

private:
    void FinalizeInit();
    friend class EdgeRasterizerImpl;

private:
    GeneratorSystem* m_sys;
    KyInt32 m_pixelSize;
    KyInt64 m_pixelSize64; // same in 64 bits

    SingleStageRaster* m_singleStageRaster;
    KyFloat32 m_meter_pixelSize;


    Coord m_Au; // Coordinate of A along "u" axis
    Coord m_Av; // Coordinate of A along "v" axis
    KyFloat32 m_meter_Az; // the altitude in meter of point A

    Coord m_Bu; // Coordinate of B along "u" axis
    Coord m_Bv; // Coordinate of B along "u" axis
    KyFloat32 m_meter_Bz;  // the altitude in meter of point B

    // Raster pixelBox in uv coordinates
    // retrieved during InitToRasterizeAlong_X/Y
    PixelCoord m_MINpu;
    PixelCoord m_MAXpu;
    PixelCoord m_MINpv;
    PixelCoord m_MAXpv;

    KyFloat32 m_dz_on_du; // gradient of altitude along "u"
    KyFloat32 m_meter_step_z; // increment of altitude by pixel along "u"

    // internal values we cache to speedUp GetPv() computation
    KyInt64 m_ABu; // = (KyInt64)(m_Bu - m_Au);
    KyInt64 m_ABv; // = (KyInt64)(m_Bv - m_Av); used in GetPv()
    KyInt64 m_ABu_by_Av; // = m_ABu * m_Av; used in GetPv()
    KyInt64 m_ABu_by_pixelSize; // = m_ABu * m_coord_pixelSize; used in GetPv()

    // so: Does "u" means X axis or Y axis ? and v ?
    // m_x_in_uv = 0;
    // m_y_in_uv = 1;
    // means Rasterize along X
    //  m_x_in_uv = 1;
    //  m_y_in_uv = 0;
    // means Rasterize along Y
    KyInt32 m_x_in_uv;
    KyInt32 m_y_in_uv;
};


}