terrain.h

using namespace std;

class Terrain
{
public:
    struct InitInfo
    {
        wstring HeightmapFileName,
            LayerMapFileName0,
            LayerMapFileName1,
            LayerMapFileName2,
            LayerMapFileName3,
            LayerMapFileName4,
            BlendMapFileName;

        float HeightScale;
        float HeightOffset;
        UINT NumRows;
        UINT NumCols;
        float CellSpacing;
    };

public:
    Terrain();
    ~Terrain();

    void Init(const InitInfo& info);

    float width()const;
    float depth()const;

    float getHeight(float x, float y)const;
    void SetDirectionToSun(const XMFLOAT3& v);
    void draw(CXMMATRIX world, Camera& cam);

private:
    void BuildFX();
    void loadHeightMap();
    void Smooth();
    bool inBounds(UINT i, UINT j);
    float average(UINT i, UINT j);
    void BuildVertexBuffer();
    void BuildIndexBuffer();

private:
    InitInfo mInfo;

    UINT mNumVertices;
    UINT mNumFaces;

    vector<float> mHeightmap;

    ID3DX11Effect* mFX;


    ID3D11Buffer* mVB;
    ID3D11Buffer* mIB;

    ID3D11ShaderResourceView* mLayer0;
    ID3D11ShaderResourceView* mLayer1;
    ID3D11ShaderResourceView* mLayer2;
    ID3D11ShaderResourceView* mLayer3;
    ID3D11ShaderResourceView* mLayer4;
    ID3D11ShaderResourceView* mBlendMap;

    ID3DX11EffectTechnique* mTech;
    ID3DX11EffectMatrixVariable* mfxWVPVar;
    ID3DX11EffectMatrixVariable* mfxWorldVar;
    ID3DX11EffectVectorVariable* mfxDirToSunVar;
    ID3DX11EffectShaderResourceVariable* mfxLayer0Var;
    ID3DX11EffectShaderResourceVariable* mfxLayer1Var;
    ID3DX11EffectShaderResourceVariable* mfxLayer2Var;
    ID3DX11EffectShaderResourceVariable* mfxLayer3Var;
    ID3DX11EffectShaderResourceVariable* mfxLayer4Var;
    ID3DX11EffectShaderResourceVariable* mfxBlendMapVar;

};