src/main/java/ftbsc/bscv/patches/LiquidPushPatch.java


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package ftbsc.bscv.patches;

import ftbsc.bscv.ICommons;
import ftbsc.lll.processor.annotations.Find;
import ftbsc.lll.processor.annotations.Injector;
import ftbsc.lll.processor.annotations.Patch;
import ftbsc.lll.processor.annotations.Target;
import ftbsc.lll.proxies.impl.MethodProxy;
import ftbsc.lll.tools.InsnSequence;
import ftbsc.lll.tools.nodes.MethodProxyInsnNode;
import net.minecraft.entity.player.PlayerEntity;
import net.minecraftforge.common.MinecraftForge;
import net.minecraftforge.eventbus.api.Cancelable;
import net.minecraftforge.eventbus.api.Event;

import org.objectweb.asm.Opcodes;
import org.objectweb.asm.tree.*;

public class LiquidPushPatch implements ICommons {

   @Cancelable
   public static class PlayerLiquidPushEvent extends Event {}

   public static boolean shouldCancelLiquidCollisions(PlayerEntity player) {
      if (player.equals(MC.player)) {
         return MinecraftForge.EVENT_BUS.post(new PlayerLiquidPushEvent());
      }
      return false;
   }

   @Patch(PlayerEntity.class)
   public abstract static class LiquidCollisionsOverride implements Opcodes {
      @Find(LiquidPushPatch.class)
      MethodProxy shouldCancelLiquidCollisions;

      @Target(of = "shouldCancelLiquidCollisions")
      abstract boolean shouldCancelLiquidCollisions(PlayerEntity player);

      @Target(of = "injectLiquidCollisionHook")
      abstract boolean isPushedByFluid();

      @Injector(reason = "add hook to cancel liquid collisions")
      public void injectLiquidCollisionHook(ClassNode clazz, MethodNode main) {
         LabelNode skip = new LabelNode();
         InsnSequence is = new InsnSequence();
         is.add(new VarInsnNode(ALOAD, 0));
         is.add(new MethodProxyInsnNode(INVOKESTATIC, shouldCancelLiquidCollisions));
         is.add(new JumpInsnNode(IFEQ, skip));
         is.add(new InsnNode(ICONST_0));
         is.add(new InsnNode(IRETURN));
         is.add(skip);

         main.instructions.insert(is); // hook at top
      }
   }
}