TerrainGeoMipmapIndices.h

#pragma once
 
namespace ParaTerrain
{
    enum GeoMipmapChunkType
{
    gmc_normal = 0,
    gmc_surrounded,
    gmc_topLeft,
    gmc_left,
    gmc_bottomLeft,
    gmc_bottom,
    gmc_bottomRight,
    gmc_right,
    gmc_topRight,
    gmc_top,
    gmc_chunkTypeCount,
};

    class IndexInfo
{
    int m_startPos;
    int m_indexCount;

public:
    IndexInfo():m_startPos(0),m_indexCount(0){};
    int GetStartIndexPos(){return m_startPos;};
    int GetIndexCount(){return m_indexCount;};

    void SetStartIndex_(int startIndex){m_startPos = startIndex;}
    void SetIndexCount_(int count){m_indexCount = count;}
};

    class GeoMipmapIndicesGroup
    {
    public:
        GeoMipmapIndicesGroup();
        ~GeoMipmapIndicesGroup();
        bool CreateIndex(int indexOffset,int vertexCountX,int minVertexLodStep,int lodCount);
        IndexInfo* GetChunkIndexInfo(int level,GeoMipmapChunkType type);
        short* GetIndexData(){return m_pIndices;};
        void ReleaseInternalIndices();
        int GetIndexCount(){return m_totalIndexCount;}

    private:
        int m_minVertexLodStep;
        int m_lodCount;
        int m_vertexCountX;
        int m_indexOffset;

        int m_totalIndexCount;
        short* m_pIndices;
        IndexInfo** m_lodIndexInfoGroup;

        int GetChunkIndexCount(int vertexLodStep,GeoMipmapChunkType type);
        int GetLevelIndexCount(int vertexLodStep);
        int FillLevelIndex(int startIdx,int level);
    };
}