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Fix potential 1.7 teleport confirmation desync #695

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Fix potential 1.7 teleport confirmation desync #695

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7 changes: 6 additions & 1 deletion ...in/java/com/viaversion/viarewind/protocol/v1_9to1_8/rewriter/PlayerPacketRewriter1_9.java
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Original file line number Diff line number Diff line change
Expand Up @@ -334,7 +334,12 @@ public void register() {
final PlayerPositionTracker storage = wrapper.user().get(PlayerPositionTracker.class);
storage.sendAnimations();
if (storage.getConfirmId() != -1) {
if (storage.getPosX() == x && storage.getPosY() == y && storage.getPosZ() == z && storage.getYaw() == yaw && storage.getPitch() == pitch) {
// 1.7 uses resynced hitbox minY for y however this can have small floating point error due to the calculations it does to get there on teleport confirm
// This Y error gets propagated from 1.7 to 1.8 to 1.9 which causes teleport confirmation to not properly be detected
// This fixes it similarly to how anticheats detect teleports: https://github.com/GrimAnticheat/Grim/blob/67aa3a9483a9b2a6987d594092697b4104c781f0/common/src/main/java/ac/grim/grimac/manager/SetbackTeleportUtil.java#L315
boolean closeEnoughY = Math.abs(storage.getPosY() - y) <= 1e-7;

if (storage.getPosX() == x && closeEnoughY && storage.getPosZ() == z && storage.getYaw() == yaw && storage.getPitch() == pitch) {
final PacketWrapper confirmTeleport = PacketWrapper.create(ServerboundPackets1_9.ACCEPT_TELEPORTATION, wrapper.user());
confirmTeleport.write(Types.VAR_INT, storage.getConfirmId());
confirmTeleport.sendToServer(Protocol1_9To1_8.class);
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