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 719b87705577132389f262a1557e5e84d37374d0..9c558fc727eb597612139820650a4226a7923cbb 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -425,4 +425,10 @@ 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 c3d3c06e06a85ce926a2be69ec9d9b8a3eb9b8e2..11ebadaa2438281a54cffe025a49ee5046a71ba5 100644
--- a/src/main/java/net/minecraft/world/level/block/LiquidBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/LiquidBlock.java
@@ -24,6 +24,7 @@ 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;
@@ -107,11 +108,27 @@ 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()) {
@@ -124,7 +141,7 @@ 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
         }
 
     }
