mirror of
https://github.com/PaperMC/Paper.git
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89d51d5f29
Because this exploit has been widely known for years and has not been fixed by Mojang, we decided that it was worth allowing people to toggle it on/off due to how easy it is to make it configurable. It should be noted that this decision does not promise all future exploits will be configurable.
159 lines
8.3 KiB
Diff
159 lines
8.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Paul Sauve <paul@technove.co>
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Date: Sat, 31 Oct 2020 18:43:02 -0500
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Subject: [PATCH] Strip raytracing for EntityLiving#hasLineOfSight
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The BlockGetter#clip method is very wasteful in both allocations,
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and in logic. While EntityLiving#hasLineOfSight provides static
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parameters for collisions with blocks and fluids, the method still does
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a lot of dynamic checks for both of these, which result in extra work.
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As well, since the fluid collision option is set to NONE, the entire
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fluid collision system is completely unneeded, yet used anyways.
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Copyright (C) 2020 Technove LLC
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
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index 761c7136147a5c65f700daadfc370cbd13b0b455..6b58292469b5507e0e000455146a7ee1852571c5 100644
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--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
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+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
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@@ -3746,7 +3746,7 @@ public abstract class LivingEntity extends Entity implements Attackable {
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Vec3 vec3d1 = new Vec3(entity.getX(), entity.getEyeY(), entity.getZ());
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// Paper - diff on change - used in CraftLivingEntity#hasLineOfSight(Location) and CraftWorld#lineOfSightExists
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- return vec3d1.distanceToSqr(vec3d) > 128.0D * 128.0D ? false : this.level().clip(new ClipContext(vec3d, vec3d1, ClipContext.Block.COLLIDER, ClipContext.Fluid.NONE, this)).getType() == HitResult.Type.MISS; // Paper - Perf: Use distance squared
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+ return vec3d1.distanceToSqr(vec3d) > 128.0D * 128.0D ? false : this.level().clipDirect(vec3d, vec3d1, net.minecraft.world.phys.shapes.CollisionContext.of(this)) == HitResult.Type.MISS; // Paper - Perf: Use distance squared & strip raytracing
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}
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}
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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 bb8e962e63c7a2d931f9bd7f7c002aa35cfa5fd3..0fa131a6c98adb498fc8d534e0e39647e80c6923 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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@@ -68,6 +68,18 @@ public interface BlockGetter extends LevelHeightAccessor {
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});
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}
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+ // Paper start - Broken down variant of the method below, used by Level#clipDirect
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+ @Nullable
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+ default BlockHitResult.Type clipDirect(Vec3 start, Vec3 end, BlockPos pos, BlockState state, net.minecraft.world.phys.shapes.CollisionContext collisionContext) {
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+ if (state.isAir()) {
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+ return null;
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+ }
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+
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+ final VoxelShape voxelshape = ClipContext.Block.COLLIDER.get(state, this, pos, collisionContext);
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+ final BlockHitResult hitResult = this.clipWithInteractionOverride(start, end, pos, voxelshape, state);
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+ return hitResult == null ? null : hitResult.getType();
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+ }
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+ // Paper end
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// CraftBukkit start - moved block handling into separate method for use by Block#rayTrace
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default BlockHitResult clip(ClipContext raytrace1, BlockPos blockposition) {
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// Paper start - Add predicate for blocks when raytracing
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diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
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index 207dd58cbceb5ac5c073526b40196f42fee77168..a798e1692141bd23f8a1d4916c5cbac2a5447d1f 100644
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--- a/src/main/java/net/minecraft/world/level/Level.java
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+++ b/src/main/java/net/minecraft/world/level/Level.java
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@@ -329,10 +329,87 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
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return null;
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}
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- // Paper start
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+ // Paper start - Broken down method of raytracing for EntityLiving#hasLineOfSight, replaces BlockGetter#clip(CollisionContext)
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public net.minecraft.world.phys.BlockHitResult.Type clipDirect(Vec3 start, Vec3 end, net.minecraft.world.phys.shapes.CollisionContext context) {
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- // To be patched over
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- return this.clip(new ClipContext(start, end, ClipContext.Block.COLLIDER, ClipContext.Fluid.NONE, context)).getType();
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+ // most of this code comes from BlockGetter#clip(CollisionContext, BiFunction, Function), but removes the needless functions
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+ if (start.equals(end)) {
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+ return net.minecraft.world.phys.BlockHitResult.Type.MISS;
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+ }
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+
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+ final double endX = Mth.lerp(-1.0E-7D, end.x, start.x);
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+ final double endY = Mth.lerp(-1.0E-7D, end.y, start.y);
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+ final double endZ = Mth.lerp(-1.0E-7D, end.z, start.z);
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+
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+ final double startX = Mth.lerp(-1.0E-7D, start.x, end.x);
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+ final double startY = Mth.lerp(-1.0E-7D, start.y, end.y);
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+ final double startZ = Mth.lerp(-1.0E-7D, start.z, end.z);
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+
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+ int currentX = Mth.floor(startX);
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+ int currentY = Mth.floor(startY);
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+ int currentZ = Mth.floor(startZ);
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+
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+ final BlockPos.MutableBlockPos currentBlock = new BlockPos.MutableBlockPos(currentX, currentY, currentZ);
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+
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+ LevelChunk chunk = this.getChunkIfLoaded(currentBlock);
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+ if (chunk == null) {
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+ return net.minecraft.world.phys.BlockHitResult.Type.MISS;
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+ }
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+
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+ final net.minecraft.world.phys.BlockHitResult.Type initialCheck = this.clipDirect(start, end, currentBlock, chunk.getBlockState(currentBlock), context);
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+ if (initialCheck != null) {
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+ return initialCheck;
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+ }
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+
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+ final double diffX = endX - startX;
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+ final double diffY = endY - startY;
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+ final double diffZ = endZ - startZ;
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+
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+ final int xDirection = Mth.sign(diffX);
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+ final int yDirection = Mth.sign(diffY);
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+ final int zDirection = Mth.sign(diffZ);
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+
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+ final double normalizedX = xDirection == 0 ? Double.MAX_VALUE : (double) xDirection / diffX;
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+ final double normalizedY = yDirection == 0 ? Double.MAX_VALUE : (double) yDirection / diffY;
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+ final double normalizedZ = zDirection == 0 ? Double.MAX_VALUE : (double) zDirection / diffZ;
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+
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+ double normalizedXDirection = normalizedX * (xDirection > 0 ? 1.0D - Mth.frac(startX) : Mth.frac(startX));
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+ double normalizedYDirection = normalizedY * (yDirection > 0 ? 1.0D - Mth.frac(startY) : Mth.frac(startY));
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+ double normalizedZDirection = normalizedZ * (zDirection > 0 ? 1.0D - Mth.frac(startZ) : Mth.frac(startZ));
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+
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+ net.minecraft.world.phys.BlockHitResult.Type result;
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+
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+ do {
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+ if (normalizedXDirection > 1.0D && normalizedYDirection > 1.0D && normalizedZDirection > 1.0D) {
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+ return net.minecraft.world.phys.BlockHitResult.Type.MISS;
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+ }
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+
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+ if (normalizedXDirection < normalizedYDirection) {
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+ if (normalizedXDirection < normalizedZDirection) {
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+ currentX += xDirection;
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+ normalizedXDirection += normalizedX;
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+ } else {
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+ currentZ += zDirection;
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+ normalizedZDirection += normalizedZ;
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+ }
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+ } else if (normalizedYDirection < normalizedZDirection) {
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+ currentY += yDirection;
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+ normalizedYDirection += normalizedY;
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+ } else {
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+ currentZ += zDirection;
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+ normalizedZDirection += normalizedZ;
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+ }
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+
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+ currentBlock.set(currentX, currentY, currentZ);
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+ if (chunk.getPos().x != currentBlock.getX() >> 4 || chunk.getPos().z != currentBlock.getZ() >> 4) {
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+ chunk = this.getChunkIfLoaded(currentBlock);
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+ if (chunk == null) {
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+ return net.minecraft.world.phys.BlockHitResult.Type.MISS;
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+ }
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+ }
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+ result = this.clipDirect(start, end, currentBlock, chunk.getBlockState(currentBlock), context);
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+ } while (result == null);
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+
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+ return result;
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}
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// Paper end
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