1 files changed, 69 insertions, 0 deletions
diff --git a/ihl/worldgen/WorldGeneratorBase.java b/ihl/worldgen/WorldGeneratorBase.java
new file mode 100644
index 0000000..aaaaa66
--- /dev/null
+++ b/ihl/worldgen/WorldGeneratorBase.java
@@ -0,0 +1,69 @@
+package ihl.worldgen;
+
+import java.util.HashSet;
+import java.util.Random;
+import java.util.Set;
+
+import ihl.utils.IHLUtils;
+import net.minecraft.block.Block;
+import net.minecraft.world.World;
+import net.minecraft.world.chunk.Chunk;
+import net.minecraft.world.chunk.storage.ExtendedBlockStorage;
+
+public abstract class WorldGeneratorBase {
+	private final Random random = new Random();
+	protected final Block ore;
+	private final Set<Block> replaceableBlocks = new HashSet<Block>(2);
+
+	public WorldGeneratorBase(Block oreIn, Block... replaceableBlocksIn) {
+		ore = oreIn;
+		for (Block block : replaceableBlocksIn) {
+			replaceableBlocks.add(block);
+		}
+	}
+
+	public void generate(World world, int chunkX, int chunkZ) {
+		int[] centralPOI = this.getPOI(world, chunkX, chunkZ, 0, 0);
+		int[] xz = new int[] { 0, 1, 0, -1, 0 };
+		for (int i = 0; i < 4; i++) {
+			int[] surroundPOI = this.getPOI(world, chunkX + xz[i], chunkZ + xz[i + 1], xz[i], xz[i + 1]);
+			this.replaceBlocks(world, centralPOI, surroundPOI, chunkX << 4, chunkZ << 4);
+		}
+	}
+
+	protected abstract void replaceBlocks(World world, final int[] centralPOI, final int[] surroundPOI,
+			final int startX, final int startZ);
+
+	protected boolean replace(World world, int absX, int absY, int absZ, final Block block) {
+		if (!world.getChunkProvider().chunkExists(absX >> 4, absZ >> 4)) {
+			throw new IllegalStateException("quered chunk is not yet generated!");
+		}
+		Chunk chunk = world.getChunkFromBlockCoords(absX, absZ);
+		ExtendedBlockStorage ebs = chunk.getBlockStorageArray()[absY >> 4];
+		if (ebs != null && replaceableBlocks.contains(ebs.getBlockByExtId(absX & 15, absY & 15, absZ & 15))) {
+			IHLUtils.setBlockRaw(ebs, absX & 15, absY & 15, absZ & 15, block);
+			return true;
+		}
+		return false;
+	}
+
+	protected boolean replaceAll(World world, int absX, int absY, int absZ, final Block block) {
+		if (!world.getChunkProvider().chunkExists(absX >> 4, absZ >> 4)) {
+			throw new IllegalStateException("quered chunk is not yet generated!");
+		}
+		Chunk chunk = world.getChunkFromBlockCoords(absX, absZ);
+		ExtendedBlockStorage ebs = chunk.getBlockStorageArray()[absY >> 4];
+		if (ebs != null) {
+			IHLUtils.setBlockRaw(ebs, absX & 15, absY & 15, absZ & 15, block);
+			return true;
+		}
+		return false;
+	}
+
+	private int[] getPOI(World world, int chunkX, int chunkZ, int xOffset, int zOffset) {
+		long seed = (long) chunkX << 16 ^ chunkZ << 8 ^ Block.getIdFromBlock(ore);
+		random.setSeed(seed);
+		return new int[] { random.nextInt(16) + xOffset * 16, random.nextInt(world.getActualHeight()/2),
+				random.nextInt(16) + zOffset * 16 };
+	}
+}