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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Byteflux <byte@byteflux.net>
Date: Wed, 8 Aug 2018 16:33:21 -0600
Subject: [PATCH] Configurable speed for water flowing over lava


diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index 6e7eb2134186e530f31eef6f86e30e8dbf523c4d..85ad9a1a29d0cb11f552d8f34b210f1bf4bdd810 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -446,4 +446,10 @@ public class PaperWorldConfig {
         this.armorStandTick = this.getBoolean("armor-stands-tick", this.armorStandTick);
         log("ArmorStand ticking is " + (this.armorStandTick ? "enabled" : "disabled") + " by default");
     }
+
+    public int waterOverLavaFlowSpeed;
+    private void waterOverLavaFlowSpeed() {
+        waterOverLavaFlowSpeed = getInt("water-over-lava-flow-speed", 5);
+        log("Water over lava flow speed: " + waterOverLavaFlowSpeed);
+    }
 }
diff --git a/src/main/java/net/minecraft/world/level/block/LiquidBlock.java b/src/main/java/net/minecraft/world/level/block/LiquidBlock.java
index c3afe362f76eed689c33d05e28b1b2b9107c90c7..8497adcba2570da8875c322e751fca2fdad057e5 100644
--- a/src/main/java/net/minecraft/world/level/block/LiquidBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/LiquidBlock.java
@@ -23,6 +23,7 @@ import net.minecraft.world.level.block.state.properties.BlockStateProperties;
 import net.minecraft.world.level.block.state.properties.IntegerProperty;
 import net.minecraft.world.level.material.FlowingFluid;
 import net.minecraft.world.level.material.FluidState;
+import net.minecraft.world.level.material.Material;
 import net.minecraft.world.level.pathfinder.PathComputationType;
 import net.minecraft.world.level.storage.loot.LootContext;
 import net.minecraft.world.phys.shapes.CollisionContext;
@@ -106,11 +107,27 @@ public class LiquidBlock extends Block implements BucketPickup {
     @Override
     public void onPlace(BlockState state, Level world, BlockPos pos, BlockState oldState, boolean notify) {
         if (this.shouldSpreadLiquid(world, pos, state)) {
-            world.scheduleTick(pos, state.getFluidState().getType(), this.fluid.getTickDelay(world));
+            world.scheduleTick(pos, state.getFluidState().getType(), this.getFlowSpeed(world, pos)); // Paper
         }
 
     }
 
+    // Paper start - Get flow speed. Throttle if its water and flowing adjacent to lava
+    public int getFlowSpeed(Level world, BlockPos blockposition) {
+        if (this.material == Material.WATER) {
+            if (
+                world.getMaterialIfLoaded(blockposition.north(1)) == Material.LAVA ||
+                world.getMaterialIfLoaded(blockposition.south(1)) == Material.LAVA ||
+                world.getMaterialIfLoaded(blockposition.west(1)) == Material.LAVA ||
+                world.getMaterialIfLoaded(blockposition.east(1)) == Material.LAVA
+            ) {
+                return world.paperConfig.waterOverLavaFlowSpeed;
+            }
+        }
+        return this.fluid.getTickDelay(world);
+    }
+    // Paper end
+
     @Override
     public BlockState updateShape(BlockState state, Direction direction, BlockState neighborState, LevelAccessor world, BlockPos pos, BlockPos neighborPos) {
         if (state.getFluidState().isSource() || neighborState.getFluidState().isSource()) {
@@ -123,7 +140,7 @@ public class LiquidBlock extends Block implements BucketPickup {
     @Override
     public void neighborChanged(BlockState state, Level world, BlockPos pos, Block block, BlockPos fromPos, boolean notify) {
         if (this.shouldSpreadLiquid(world, pos, state)) {
-            world.scheduleTick(pos, state.getFluidState().getType(), this.fluid.getTickDelay(world));
+            world.scheduleTick(pos, state.getFluidState().getType(), this.getFlowSpeed(world, pos)); // Paper
         }
 
     }