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Spigot still maintains some partial implementation of "tick skipping", a practice in which the MinecraftServer.currentTick field is updated not by an increment of one per actual tick, but instead set to System.currentTimeMillis() / 50. This behaviour means that the tracked tick may "skip" a tick value in case a previous tick took more than the expected 50ms. To compensate for this in important paths, spigot/craftbukkit implements "wall-time". Instead of incrementing/decrementing ticks on block entities/entities by one for each call to their tick() method, they instead increment/decrement important values, like an ItemEntity's age or pickupDelay, by the difference of `currentTick - lastTick`, where `lastTick` is the value of `currentTick` during the last tick() call. These "fixes" however do not play nicely with minecraft's simulation distance as entities/block entities implementing the above behaviour would "catch up" their values when moving from a non-ticking chunk to a ticking one as their `lastTick` value remains stuck on the last tick in a ticking chunk and hence lead to a large "catch up" once ticked again. Paper completely removes the "tick skipping" behaviour (See patch "Further-improve-server-tick-loop"), making the above precautions completely unnecessary, which also rids paper of the previous described incompatibility with non-ticking chunks.
26 lines
1.6 KiB
Diff
26 lines
1.6 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Spottedleaf <Spottedleaf@users.noreply.github.com>
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Date: Fri, 28 Aug 2020 12:33:47 -0700
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Subject: [PATCH] Don't lookup fluid state when raytracing, skip air blocks
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Just use the iblockdata already retrieved, removes a getType call.
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Also save approx. 5% for the raytrace call, as most (expensive)
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raytracing tends to go through air and returning early is an
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easy win. The remaining problems with this function
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are mostly with the block getting itself.
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diff --git a/src/main/java/net/minecraft/world/level/BlockGetter.java b/src/main/java/net/minecraft/world/level/BlockGetter.java
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index c3760e0c8ac0b3ea200f4e1c237e250137a78caf..c978f3b2d42f512e982f289e76c2422e41b7eec6 100644
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--- a/src/main/java/net/minecraft/world/level/BlockGetter.java
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+++ b/src/main/java/net/minecraft/world/level/BlockGetter.java
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@@ -79,7 +79,8 @@ public interface BlockGetter extends LevelHeightAccessor {
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return BlockHitResult.miss(raytrace1.getTo(), Direction.getNearest(vec3d.x, vec3d.y, vec3d.z), BlockPos.containing(raytrace1.getTo()));
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}
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// Paper end - Prevent raytrace from loading chunks
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- FluidState fluid = this.getFluidState(blockposition);
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+ if (iblockdata.isAir()) return null; // Paper - Perf: optimise air cases
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+ FluidState fluid = iblockdata.getFluidState(); // Paper - Perf: don't need to go to world state again
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Vec3 vec3d = raytrace1.getFrom();
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Vec3 vec3d1 = raytrace1.getTo();
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VoxelShape voxelshape = raytrace1.getBlockShape(iblockdata, this, blockposition);
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