Merged rotation smoothing bugfix by mocksonline from PR FoundationGames#129 of the main repo

Author: ToadsworthLP

common/src/main/java/io/github/foundationgames/automobility/mixin/EntityMixin.java

@@ -1,15 +1,42 @@
 package io.github.foundationgames.automobility.mixin;
 
 import io.github.foundationgames.automobility.entity.AutomobileEntity;
+import net.minecraft.client.player.LocalPlayer;
+import net.minecraft.util.Mth;
 import net.minecraft.world.entity.Entity;
 import net.minecraft.world.entity.player.Player;
 import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.Unique;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 
 @Mixin(Entity.class)
 public class EntityMixin {
+    @Shadow
+    private float yRot;
+    @Shadow
+    public float yRotO;
+    @Unique
+    private float automobility$lastYRot = 0f;
+
+    // Rotation smoothing bug fix taken from https://github.com/FoundationGames/Automobility/pull/129
+    @Inject(method = "setYRot", at = @At("HEAD"), cancellable = true)
+    public void automobility$smoothYRotOnAutomobile(float yRot, CallbackInfo ci) {
+        Entity self = (Entity)(Object)this;
+        if (self instanceof LocalPlayer player && player.isLocalPlayer() && self.getVehicle() instanceof AutomobileEntity) {
+            float smoothedYRot = Mth.rotLerp(1.0f, this.automobility$lastYRot, yRot);
+            this.automobility$lastYRot = smoothedYRot;
+
+            ci.cancel();
+            this.yRotO = this.yRot;
+            this.yRot = smoothedYRot;
+        } else {
+            this.automobility$lastYRot = yRot;
+        }
+    }
+
     @Inject(method = "stopRiding", at = @At("HEAD"))
     private void automobility$clientFinalSyncBeforeDismountAutomobile(CallbackInfo ci) {
         var self = (Entity) (Object) this;