BlockLightGridServer.h

#pragma once

#include "BlockLightGridBase.h"

namespace ParaEngine
{
    class CBlockLightGridServer : public CBlockLightGridBase
    {
    public:
        CBlockLightGridServer(CBlockWorld* pBlockWorld);
        virtual ~CBlockLightGridServer();

    public:
        virtual void OnEnterWorld();
        virtual void OnLeaveWorld();
        virtual void OnWorldMove(uint16_t centerChunkX, uint16_t centerChunkZ);
        virtual void UpdateLighting();

        //get light brightness of current and 26 nearby block
        // @param brightness: pointer to uint8_t blockBrightness[27];
        // @param nSize: if 1, it will only get the center block.
        // @param nLightType: -1 means Max light. 0 means emissive block light, 1 means sun light. 2 means both. where brightness[i] is block light and brightness[i+nSize] is sunlight 
        // @return : true if exist.  false if there is no block at the position. 
        virtual bool GetBrightness(Uint16x3& blockId, uint8_t* brightness, int nSize = 27, int nLightType = -1);

        virtual void SetLightDirty(Uint16x3& blockId_ws, bool isSunLight);

        virtual void AddDirtyColumn(uint16_t chunkX_ws, uint16_t chunkZ_ws);

        virtual int GetDirtyColumnCount();

    private:
        //this is the core function to spread light
        void EmitLight(const Uint16x3& blockId, uint8_t brightness, bool isSunLight = false);

        //recalc light when remove light or block state changed 
        void RefreshLight(const Uint16x3& blockId);
        void RefreshLight(const Uint16x3& blockId, bool isSunLight);

        void EmitSunLight(uint16_t blockIdX_ws, uint16_t blockIdZ_ws, bool bInitialSet = false);

        BlockIndex CalcLightDataIndex(const Uint16x3& blockId);

        LightData* GetLightData(const BlockIndex& index);
        LightData* GetLightData(uint16_t x, uint16_t y, uint16_t z);
        BlockChunk* GetChunk(uint16_t x, uint16_t y, uint16_t z);

    public:
        int m_max_cells_per_frame;
        int m_max_cells_left_per_frame;
    private:
        
    };
}