BlockTessellators.h

#pragma once
#include "BlockCommon.h"

namespace ParaEngine
{
    class CBlockWorld;
    class BlockChunk;
    class BlockVertexCompressed;

    class BlockTessellatorBase
    {
    public:
        BlockTessellatorBase(CBlockWorld* pWorld);

        virtual void SetWorld(CBlockWorld* pWorld);

        int32_t GetAvgVertexLight(int32_t v1, int32_t v2, int32_t v3, int32_t v4);

        int32_t GetMaxVertexLight(int32_t v1, int32_t v2, int32_t v3, int32_t v4);

        uint8 GetMeshBrightness(BlockTemplate * pBlockTemplate, uint8* blockBrightness);

        uint32_t CalculateCubeAO();


        virtual int32 TessellateBlock(BlockChunk* pChunk, uint16 packedBlockId, BlockRenderMethod dwShaderID, BlockVertexCompressed** pOutputData);

    public:
        Block* neighborBlocks[27];
        uint8_t blockBrightness[27 * 3];
        BlockModel tessellatedModel;

    protected:
        bool UpdateCurrentBlock(BlockChunk* pChunk, uint16 packedBlockId);

        void FetchNearbyBlockInfo(BlockChunk* pChunk, const Uint16x3& packedBlockId, int nNearbyBlockCount = 27, int nNearbyLightCount = -1);

    protected:
        CBlockWorld* m_pWorld;
        BlockTemplate * m_pCurBlockTemplate;
        uint32 m_nBlockData;
        BlockModel* m_pCurBlockModel;
        // world space location. 
        Uint16x3 m_blockId_ws;
        // chunk containing current block. 
        BlockChunk* m_pChunk;
        // chunk space coordinate. 
        Uint16x3 m_blockId_cs;
    };

    class BlockGeneralTessellator : public BlockTessellatorBase
    {
    public:
        BlockGeneralTessellator(CBlockWorld* pWorld);;
        virtual int32 TessellateBlock(BlockChunk* pChunk, uint16 packedBlockId, BlockRenderMethod dwShaderID, BlockVertexCompressed** pOutputData);


    protected:
        void TessellateLiquidOrIce(BlockRenderMethod dwShaderID);
        void TessellateStdCube(BlockRenderMethod dwShaderID);
        void TessellateUniformLightingCustomModel(BlockRenderMethod dwShaderID);
        void TessellateSelfLightingCustomModel(BlockRenderMethod dwShaderID);

        
    };
}