ClientHeightMap.java

/*
 *  This file is part of Cubic Chunks Mod, licensed under the MIT License (MIT).
 *
 *  Copyright (c) 2015 contributors
 *
 *  Permission is hereby granted, free of charge, to any person obtaining a copy
 *  of this software and associated documentation files (the "Software"), to deal
 *  in the Software without restriction, including without limitation the rights
 *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *  copies of the Software, and to permit persons to whom the Software is
 *  furnished to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be included in
 *  all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *  THE SOFTWARE.
 */
package cubicchunks.world;

import com.google.common.base.Throwables;

import net.minecraft.block.state.IBlockState;

import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.util.Arrays;

import cubicchunks.util.Coords;
import cubicchunks.world.column.Column;

public class ClientHeightMap implements IHeightMap {

	private final Column chunk;
	private int[] hmap;
	private int[] bottomBlocks;
	private int heightMapLowest = Coords.NO_HEIGHT;

	public ClientHeightMap(Column column) {
		this.chunk = column;
		this.hmap = new int[256];
		this.bottomBlocks = new int[256];

		Arrays.fill(hmap, Coords.NO_HEIGHT);
		Arrays.fill(bottomBlocks, Coords.NO_HEIGHT);
	}

	public int getOpacity(int localX, int blockY, int localZ) {
		IBlockState state = chunk.getBlockState(localX, blockY, localZ);
		return state.getLightOpacity();
	}

	@Override
	public boolean isOccluded(int localX, int blockY, int localZ) {
		Integer topY = this.getTopBlockY(localX, localZ);
		return topY != null && blockY <= topY;
	}

	@Override
	public void onOpacityChange(int localX, int blockY, int localZ, int opacity) {
		//do nothing, we return values based on real blocks
	}

	@Override
	public int getTopBlockY(int localX, int localZ) {
		return hmap[getIndex(localX, localZ)];
	}

	@Override
	public int getBottomBlockY(int localX, int localZ) {
		return bottomBlocks[getIndex(localX, localZ)];
	}

	@Override
	public int getLowestTopBlockY() {
		if (heightMapLowest == Coords.NO_HEIGHT) {
			heightMapLowest = Integer.MAX_VALUE;
			for (int i = 0; i < hmap.length; i++) {
				if (hmap[i] < heightMapLowest) {
					heightMapLowest = hmap[i];
				}
			}
		}
		return heightMapLowest;
	}

	@Override
	public int getTopBlockYBelow(int localX, int localZ, int blockY) {
		throw new UnsupportedOperationException("Not implemented");
	}

	public void setHeight(int localX, int localZ, int height) {
		hmap[getIndex(localX, localZ)] = height;
	}

	public void setBottomBlockY(int localX, int localZ, int height) {
		bottomBlocks[getIndex(localX, localZ)] = height;
	}

	public void setData(byte[] data) {
		try {
			ByteArrayInputStream buf = new ByteArrayInputStream(data);
			DataInputStream in = new DataInputStream(buf);

			for (int i = 0; i < 256; i++) {
				bottomBlocks[i] = in.readInt();
			}
			for (int i = 0; i < 256; i++) {
				hmap[i] = in.readInt();
			}

			in.close();
		} catch (IOException e) {
			throw Throwables.propagate(e);
		}
	}

	public int[] getHeightmap() {
		return this.hmap;
	}

	private static int getIndex(int localX, int localZ) {
		return (localZ << 4) | localX;
	}

	private static int unpackX(int index) {
		return index & 0xF;
	}

	private static int unpackZ(int index) {
		return (index >> 4) & 0xF;
	}

}