Underflow duct (#6957)

* Underflow Gate

I'm not sure why ClassMap decided to import OverflowDuct instead of using the full path when being generated.

* Better top sprite

Also fix base asymmetry

Co-authored-by: Anuken <arnukren@gmail.com>

core/src/mindustry/content/Blocks.java

@@ -103,7 +103,7 @@ public class Blocks{
     overflowGate, underflowGate, massDriver,
 
     //transport - alternate
-    duct, armoredDuct, ductRouter, overflowDuct, ductBridge, ductUnloader,
+    duct, armoredDuct, ductRouter, overflowDuct, underflowDuct, ductBridge, ductUnloader,
     surgeConveyor, surgeRouter,
 
     unitCargoLoader, unitCargoUnloadPoint,
@@ -1991,6 +1991,15 @@ public class Blocks{
             researchCostMultiplier = 1.5f;
         }};
 
+        underflowDuct = new OverflowDuct("underflow-duct"){{
+            requirements(Category.distribution, with(Items.graphite, 8, Items.beryllium, 8));
+            health = 90;
+            speed = 4f;
+            solid = false;
+            researchCostMultiplier = 1.5f;
+            invert = true;
+        }};
+
         ductBridge = new DuctBridge("duct-bridge"){{
             requirements(Category.distribution, with(Items.beryllium, 20));
             health = 90;
@@ -5316,4 +5325,4 @@ public class Blocks{
 
         //endregion
     }
-}
+}

core/src/mindustry/content/ErekirTechTree.java

@@ -87,6 +87,7 @@ public class ErekirTechTree{
                     });
 
                     node(overflowDuct, Seq.with(new OnSector(two)), () -> {
+                        node(underflowDuct);
                         node(reinforcedContainer, () -> {
                             node(ductUnloader, () -> {
 

core/src/mindustry/mod/ClassMap.java

@@ -1,6 +1,8 @@
 package mindustry.mod;
 
 import arc.struct.*;
+import mindustry.world.blocks.distribution.OverflowDuct.*;
+
 /** Generated class. Maps simple class names to concrete classes. For use in JSON mods. */
 @SuppressWarnings("deprecation")
 public class ClassMap{
@@ -226,7 +228,7 @@ public class ClassMap{
         classes.put("DriverState", mindustry.world.blocks.distribution.MassDriver.DriverState.class);
         classes.put("MassDriverBuild", mindustry.world.blocks.distribution.MassDriver.MassDriverBuild.class);
         classes.put("OverflowDuct", mindustry.world.blocks.distribution.OverflowDuct.class);
-        classes.put("DuctRouterBuild", mindustry.world.blocks.distribution.OverflowDuct.DuctRouterBuild.class);
+        classes.put("DuctRouterBuild", OverflowDuctBuild.class);
         classes.put("OverflowGate", mindustry.world.blocks.distribution.OverflowGate.class);
         classes.put("OverflowGateBuild", mindustry.world.blocks.distribution.OverflowGate.OverflowGateBuild.class);
         classes.put("Router", mindustry.world.blocks.distribution.Router.class);

core/src/mindustry/world/blocks/distribution/OverflowDuct.java

@@ -13,6 +13,7 @@ import mindustry.world.meta.*;
 
 public class OverflowDuct extends Block{
     public float speed = 5f;
+    public boolean invert = false;
 
     public @Load(value = "@-top") TextureRegion topRegion;
 
@@ -57,7 +58,7 @@ public class OverflowDuct extends Block{
         return false;
     }
 
-    public class DuctRouterBuild extends Building{
+    public class OverflowDuctBuild extends Building{
         public float progress;
         public @Nullable Item current;
 
@@ -95,11 +96,27 @@ public class OverflowDuct extends Block{
         public Building target(){
             if(current == null) return null;
 
+            if(invert){ //Lots of extra code. Make separate UnderflowDuct class?
+                Building l = left(), r = right();
+                boolean lc = l != null && l.team == team && l.acceptItem(this, current),
+                    rc = r != null && r.team == team && r.acceptItem(this, current);
+
+                if(lc && !rc){
+                    return l;
+                }else if(rc && !lc){
+                    return r;
+                }else if(lc && rc){
+                    return cdump == 0 ? l : r;
+                }
+            }
+
             Building front = front();
             if(front != null && front.team == team && front.acceptItem(this, current)){
                 return front;
             }
 
+            if(invert) return null;
+
             for(int i = -1; i <= 1; i++){
                 int dir = Mathf.mod(rotation + (((i + cdump + 1) % 3) - 1), 4);
                 if(dir == rotation) continue;
@@ -108,6 +125,7 @@ public class OverflowDuct extends Block{
                     return other;
                 }
             }
+
             return null;
         }