block packet API

src/main/java/com/falsepattern/chunk/internal/BlockPosUtil.java

@@ -0,0 +1,28 @@
+package com.falsepattern.chunk.internal;
+
+public class BlockPosUtil {
+    private static final int NUM_X_BITS = 26;
+    private static final int NUM_Z_BITS = 26;
+    private static final int NUM_Y_BITS = 64 - NUM_X_BITS - NUM_Z_BITS;
+    private static final long Y_MASK = (1L << NUM_Y_BITS) - 1L;
+    private static final int Y_SHIFT = NUM_Z_BITS;
+    private static final int X_SHIFT = Y_SHIFT + NUM_Y_BITS;
+    private static final long Z_MASK = (1L << NUM_Z_BITS) - 1L;
+    private static final long X_MASK = (1L << NUM_X_BITS) - 1L;
+
+    public static long packToLong(int x, int y, int z) {
+        return ((long) x & X_MASK) << X_SHIFT | ((long) y & Y_MASK) << Y_SHIFT | ((long) z & Z_MASK);
+    }
+
+    public static int getX(long packed) {
+        return (int) (packed << 64 - X_SHIFT - NUM_X_BITS >> 64 - NUM_X_BITS);
+    }
+
+    public static int getY(long packed) {
+        return (int) (packed << 64 - Y_SHIFT - NUM_Y_BITS >> 64 - NUM_Y_BITS);
+    }
+
+    public static int getZ(long packed) {
+        return (int) (packed << 64 - NUM_Z_BITS >> 64 - NUM_Z_BITS);
+    }
+}