Reduce unnecessary branch propagation by early abort with primary direction visibility.

FightSystem/FightSystem_Core/src/de/steamwar/fightsystem/utils/Hull.java

@@ -51,6 +51,7 @@ public class Hull {
 
     private final BitSet occluding;
     private final BitSet visibility;
+    private final BitSet primaryVisible;
     private final Int2IntOpenHashMap visibilityDirections = new Int2IntOpenHashMap(); // Contains the visible directions of each occluding visible block
     private final Set<IntVector> uncoveredSurface = new HashSet<>();
 
@@ -64,6 +65,7 @@ public class Hull {
         this.primaryDirection = new IntVector(0, 0, team.isBlue() == (Config.BlueToRedZ > 0) ? -1 : 1);
         this.occluding = new BitSet(region.volume());
         this.visibility = new BitSet(region.volume());
+        this.primaryVisible = new BitSet(region.volume());
 
         branchDirections = IntStream.range(0, 27)
                 .mapToObj(v -> new IntVector(v%3 -1, (v/3)%3 -1, v/9 -1))
@@ -137,6 +139,7 @@ public class Hull {
         visibility.clear();
         occluding.clear();
         visibilityDirections.clear();
+        primaryVisible.clear();
 
         long start = System.currentTimeMillis();
         region.forEach((x, y, z) -> {
@@ -250,11 +253,14 @@ public class Hull {
             visibilityDirections.compute(id, (pos, v) -> (v == null ? 0 : v) | directionId(direction));
             return;
         }
+        if(primaryVisible.get(id))
+            return;
 
         updateBlocks(uncovered, block.add(direction), direction);
         if(!direction.equals(primaryDirection))
             return;
 
+        primaryVisible.set(id);
         for(IntVector branchDirection : branchDirections)
             updateBlocks(uncovered, block.add(branchDirection), branchDirection);
     }