resent-1.8/src/main/java/net/minecraft/world/ChunkCache.java

package net.minecraft.world;

import net.minecraft.block.material.Material;
import net.minecraft.block.state.IBlockState;
import net.minecraft.init.Blocks;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.BlockPos;
import net.minecraft.util.EnumFacing;
import net.minecraft.world.biome.BiomeGenBase;
import net.minecraft.world.chunk.Chunk;

/**+
 * This portion of EaglercraftX contains deobfuscated Minecraft 1.8 source code.
 *
 * Minecraft 1.8.8 bytecode is (c) 2015 Mojang AB. "Do not distribute!"
 * Mod Coder Pack v9.18 deobfuscation configs are (c) Copyright by the MCP Team
 *
 * EaglercraftX 1.8 patch files are (c) 2022-2023 LAX1DUDE. All Rights Reserved.
 *
 * WITH THE EXCEPTION OF PATCH FILES, MINIFIED JAVASCRIPT, AND ALL FILES
 * NORMALLY FOUND IN AN UNMODIFIED MINECRAFT RESOURCE PACK, YOU ARE NOT ALLOWED
 * TO SHARE, DISTRIBUTE, OR REPURPOSE ANY FILE USED BY OR PRODUCED BY THE
 * SOFTWARE IN THIS REPOSITORY WITHOUT PRIOR PERMISSION FROM THE PROJECT AUTHOR.
 *
 * NOT FOR COMMERCIAL OR MALICIOUS USE
 *
 * (please read the 'LICENSE' file this repo's root directory for more info)
 *
 */
public class ChunkCache implements IBlockAccess {

    protected int chunkX;
    protected int chunkZ;
    protected Chunk[][] chunkArray;
    protected boolean hasExtendedLevels;
    protected World worldObj;

    public ChunkCache(World worldIn, BlockPos posFromIn, BlockPos posToIn, int subIn) {
        this.worldObj = worldIn;
        this.chunkX = posFromIn.getX() - subIn >> 4;
        this.chunkZ = posFromIn.getZ() - subIn >> 4;
        int i = posToIn.getX() + subIn >> 4;
        int j = posToIn.getZ() + subIn >> 4;
        this.chunkArray = new Chunk[i - this.chunkX + 1][j - this.chunkZ + 1];
        this.hasExtendedLevels = true;

        for (int k = this.chunkX; k <= i; ++k) {
            for (int l = this.chunkZ; l <= j; ++l) {
                this.chunkArray[k - this.chunkX][l - this.chunkZ] = worldIn.getChunkFromChunkCoords(k, l);
            }
        }

        for (int i1 = posFromIn.getX() >> 4; i1 <= posToIn.getX() >> 4; ++i1) {
            for (int j1 = posFromIn.getZ() >> 4; j1 <= posToIn.getZ() >> 4; ++j1) {
                Chunk chunk = this.chunkArray[i1 - this.chunkX][j1 - this.chunkZ];
                if (chunk != null && !chunk.getAreLevelsEmpty(posFromIn.getY(), posToIn.getY())) {
                    this.hasExtendedLevels = false;
                }
            }
        }
    }

    /**+
     * set by !chunk.getAreLevelsEmpty
     */
    public boolean extendedLevelsInChunkCache() {
        return this.hasExtendedLevels;
    }

    public TileEntity getTileEntity(BlockPos blockpos) {
        int i = (blockpos.getX() >> 4) - this.chunkX;
        int j = (blockpos.getZ() >> 4) - this.chunkZ;
        return this.chunkArray[i][j].getTileEntity(blockpos, Chunk.EnumCreateEntityType.IMMEDIATE);
    }

    public int getCombinedLight(BlockPos blockpos, int i) {
        int j = this.getLightForExt(EnumSkyBlock.SKY, blockpos);
        int k = this.getLightForExt(EnumSkyBlock.BLOCK, blockpos);
        if (k < i) {
            k = i;
        }

        return j << 20 | k << 4;
    }

    public IBlockState getBlockState(BlockPos blockpos) {
        if (blockpos.getY() >= 0 && blockpos.getY() < 256) {
            int i = (blockpos.getX() >> 4) - this.chunkX;
            int j = (blockpos.getZ() >> 4) - this.chunkZ;
            if (i >= 0 && i < this.chunkArray.length && j >= 0 && j < this.chunkArray[i].length) {
                Chunk chunk = this.chunkArray[i][j];
                if (chunk != null) {
                    return chunk.getBlockState(blockpos);
                }
            }
        }

        return Blocks.air.getDefaultState();
    }

    public BiomeGenBase getBiomeGenForCoords(BlockPos blockpos) {
        return this.worldObj.getBiomeGenForCoords(blockpos);
    }

    private int getLightForExt(EnumSkyBlock pos, BlockPos parBlockPos) {
        if (pos == EnumSkyBlock.SKY && this.worldObj.provider.getHasNoSky()) {
            return 0;
        } else if (parBlockPos.getY() >= 0 && parBlockPos.getY() < 256) {
            if (this.getBlockState(parBlockPos).getBlock().getUseNeighborBrightness()) {
                int l = 0;

                for (EnumFacing enumfacing : EnumFacing.values()) {
                    int k = this.getLightFor(pos, parBlockPos.offset(enumfacing));
                    if (k > l) {
                        l = k;
                    }

                    if (l >= 15) {
                        return l;
                    }
                }

                return l;
            } else {
                int i = (parBlockPos.getX() >> 4) - this.chunkX;
                int j = (parBlockPos.getZ() >> 4) - this.chunkZ;
                return this.chunkArray[i][j].getLightFor(pos, parBlockPos);
            }
        } else {
            return pos.defaultLightValue;
        }
    }

    /**+
     * Checks to see if an air block exists at the provided
     * location. Note that this only checks to see if the blocks
     * material is set to air, meaning it is possible for
     * non-vanilla blocks to still pass this check.
     */
    public boolean isAirBlock(BlockPos blockpos) {
        return this.getBlockState(blockpos).getBlock().getMaterial() == Material.air;
    }

    public int getLightFor(EnumSkyBlock pos, BlockPos parBlockPos) {
        if (parBlockPos.getY() >= 0 && parBlockPos.getY() < 256) {
            int i = (parBlockPos.getX() >> 4) - this.chunkX;
            int j = (parBlockPos.getZ() >> 4) - this.chunkZ;
            return this.chunkArray[i][j].getLightFor(pos, parBlockPos);
        } else {
            return pos.defaultLightValue;
        }
    }

    public int getStrongPower(BlockPos blockpos, EnumFacing enumfacing) {
        IBlockState iblockstate = this.getBlockState(blockpos);
        return iblockstate.getBlock().getStrongPower(this, blockpos, iblockstate, enumfacing);
    }

    public WorldType getWorldType() {
        return this.worldObj.getWorldType();
    }
}