Update upstream(Luminol-lithium-sleeping-block-entity)

lophine-server/src/main/java/com/logisticscraft/occlusionculling/cache/ArrayOcclusionCache.java

@@ -0,0 +1,57 @@
+package com.logisticscraft.occlusionculling.cache;
+
+import java.util.Arrays;
+
+public class ArrayOcclusionCache implements OcclusionCache {
+
+    private final int reachX2;
+    private final byte[] cache;
+    private int positionKey;
+    private int entry;
+    private int offset;
+
+    public ArrayOcclusionCache(int reach) {
+        this.reachX2 = reach * 2;
+        this.cache = new byte[(reachX2 * reachX2 * reachX2) / 4];
+    }
+
+    @Override
+    public void resetCache() {
+        Arrays.fill(cache, (byte) 0);
+    }
+
+    @Override
+    public void setVisible(int x, int y, int z) {
+        positionKey = x + y * reachX2 + z * reachX2 * reachX2;
+        entry = positionKey / 4;
+        offset = (positionKey % 4) * 2;
+        cache[entry] |= 1 << offset;
+    }
+
+    @Override
+    public void setHidden(int x, int y, int z) {
+        positionKey = x + y * reachX2 + z * reachX2 * reachX2;
+        entry = positionKey / 4;
+        offset = (positionKey % 4) * 2;
+        cache[entry] |= 1 << offset + 1;
+    }
+
+    @Override
+    public int getState(int x, int y, int z) {
+        positionKey = x + y * reachX2 + z * reachX2 * reachX2;
+        entry = positionKey / 4;
+        offset = (positionKey % 4) * 2;
+        return cache[entry] >> offset & 3;
+    }
+
+    @Override
+    public void setLastVisible() {
+        cache[entry] |= 1 << offset;
+    }
+
+    @Override
+    public void setLastHidden() {
+        cache[entry] |= 1 << offset + 1;
+    }
+
+}