fix: water stripes on blocksdrawer

src/net/torvald/unsafe/UnsafeInt2D.kt

@@ -0,0 +1,22 @@
+package net.torvald.unsafe
+
+/**
+ * Created by minjaesong on 2024-07-22.
+ */
+class UnsafeInt2D(width: Int, height: Int) {
+
+    val width = width.toLong()
+    val height = height.toLong()
+
+    private val ptr = UnsafeHelper.allocate(4L * width * height)
+
+    private inline fun toIndex(y: Int, x: Int) = width * y + x
+
+    operator fun set(y: Int, x: Int, value: Int) = ptr.setInt(toIndex(y, x), value)
+    operator fun get(y: Int, x: Int) = ptr.getInt(toIndex(y, x))
+
+    fun destroy() = ptr.destroy()
+    val destroyed: Boolean
+        get() = ptr.destroyed
+
+}