org.bukkit.craftbukkit.generator.CraftChunkData Maven / Gradle / Ivy

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/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package org.bukkit.craftbukkit.generator;

import org.bukkit.Material;
import org.bukkit.World;
import org.bukkit.generator.ChunkGenerator;
import org.bukkit.material.MaterialData;

import java.util.Arrays;

/**
 * Data to be used for the block types and data in a newly generated chunk.
 */
public final class CraftChunkData implements ChunkGenerator.ChunkData {
  private final int maxHeight;
  private final char[][] sections;

  public CraftChunkData(World world) {
    this(world.getMaxHeight());
  }

  /* pp for tests */ CraftChunkData(int maxHeight) {
    if (maxHeight > 256) {
      throw new IllegalArgumentException("World height exceeded max chunk height");
    }
    this.maxHeight = maxHeight;
    // Minecraft hardcodes this to 16 chunk sections.
    sections = new char[16][];
  }

  @Override
  public int getMaxHeight() {
    return maxHeight;
  }

  @Override
  public void setBlock(int x, int y, int z, Material material) {
    setBlock(x, y, z, material.getId());
  }

  @Override
  public void setBlock(int x, int y, int z, MaterialData material) {
    setBlock(x, y, z, material.getItemTypeId(), material.getData());
  }

  @Override
  public void setRegion(int xMin, int yMin, int zMin, int xMax, int yMax, int zMax, Material material) {
    setRegion(xMin, yMin, zMin, xMax, yMax, zMax, material.getId());
  }

  @Override
  public void setRegion(int xMin, int yMin, int zMin, int xMax, int yMax, int zMax, MaterialData material) {
    setRegion(xMin, yMin, zMin, xMax, yMax, zMax, material.getItemTypeId(), material.getData());
  }

  @Override
  public Material getType(int x, int y, int z) {
    return Material.getMaterial(getTypeId(x, y, z));
  }

  @Override
  public MaterialData getTypeAndData(int x, int y, int z) {
    return getType(x, y, z).getNewData(getData(x, y, z));
  }

  @Override
  public void setRegion(int xMin, int yMin, int zMin, int xMax, int yMax, int zMax, int blockId) {
    setRegion(xMin, yMin, zMin, xMax, yMax, zMax, blockId, (byte) 0);
  }

  @Override
  public void setRegion(int xMin, int yMin, int zMin, int xMax, int yMax, int zMax, int blockId, int data) {
    // Clamp to sane values.
    if (xMin > 0xf || yMin >= maxHeight || zMin > 0xf) {
      return;
    }
    if (xMin < 0) {
      xMin = 0;
    }
    if (yMin < 0) {
      yMin = 0;
    }
    if (zMin < 0) {
      zMin = 0;
    }
    if (xMax > 0x10) {
      xMax = 0x10;
    }
    if (yMax > maxHeight) {
      yMax = maxHeight;
    }
    if (zMax > 0x10) {
      zMax = 0x10;
    }
    if (xMin >= xMax || yMin >= yMax || zMin >= zMax) {
      return;
    }
    char typeChar = (char) ((blockId << 4) | data);
    if (xMin == 0 && xMax == 0x10) {
      if (zMin == 0 && zMax == 0x10) {
        for (int y = yMin & 0xf0; y < yMax; y += 0x10) {
          char[] section = getChunkSection(y, true);
          if (y <= yMin) {
            if (y + 0x10 > yMax) {
              // First and last chunk section
              Arrays.fill(section, (yMin & 0xf) << 8, (yMax & 0xf) << 8, typeChar);
            } else {
              // First chunk section
              Arrays.fill(section, (yMin & 0xf) << 8, 0x1000, typeChar);
            }
          } else if (y + 0x10 > yMax) {
            // Last chunk section
            Arrays.fill(section, 0, (yMax & 0xf) << 8, typeChar);
          } else {
            // Full chunk section
            Arrays.fill(section, 0, 0x1000, typeChar);
          }
        }
      } else {
        for (int y = yMin; y < yMax; y++) {
          char[] section = getChunkSection(y, true);
          int offsetBase = (y & 0xf) << 8;
          int min = offsetBase | (zMin << 4);
          // Need to add zMax as it can be 16, which overlaps the y coordinate bits
          int max = offsetBase + (zMax << 4);
          Arrays.fill(section, min, max, typeChar);
        }
      }
    } else {
      for (int y = yMin; y < yMax; y++) {
        char[] section = getChunkSection(y, true);
        int offsetBase = (y & 0xf) << 8;
        for (int z = zMin; z < zMax; z++) {
          int offset = offsetBase | (z << 4);
          // Need to add xMax as it can be 16, which overlaps the z coordinate bits
          Arrays.fill(section, offset | xMin, offset + xMax, typeChar);
        }
      }
    }
  }

  @Override
  public void setBlock(int x, int y, int z, int blockId) {
    setBlock(x, y, z, blockId, (byte) 0);
  }

  @Override
  public void setBlock(int x, int y, int z, int blockId, byte data) {
    setBlock(x, y, z, (char) (blockId << 4 | data));
  }

  @Override
  public int getTypeId(int x, int y, int z) {
    if (x != (x & 0xf) || y < 0 || y >= maxHeight || z != (z & 0xf)) {
      return 0;
    }
    char[] section = getChunkSection(y, false);
    if (section == null) {
      return 0;
    } else {
      return section[(y & 0xf) << 8 | z << 4 | x] >> 4;
    }
  }

  @Override
  public byte getData(int x, int y, int z) {
    if (x != (x & 0xf) || y < 0 || y >= maxHeight || z != (z & 0xf)) {
      return (byte) 0;
    }
    char[] section = getChunkSection(y, false);
    if (section == null) {
      return (byte) 0;
    } else {
      return (byte) (section[(y & 0xf) << 8 | z << 4 | x] & 0xf);
    }
  }

  private void setBlock(int x, int y, int z, char type) {
    if (x != (x & 0xf) || y < 0 || y >= maxHeight || z != (z & 0xf)) {
      return;
    }
    char[] section = getChunkSection(y, true);
    section[(y & 0xf) << 8 | z << 4 | x] = type;
  }

  private char[] getChunkSection(int y, boolean create) {
    char[] section = sections[y >> 4];
    if (create && section == null) {
      sections[y >> 4] = section = new char[0x1000];
    }
    return section;
  }

  char[][] getRawChunkData() {
    return sections;
  }
}