From d5aee8289fe9aed6866204c0a8a6d1dcc07f7f72 Mon Sep 17 00:00:00 2001
From: alemi <me@alemi.dev>
Date: Sat, 11 Mar 2023 22:44:54 +0100
Subject: feat: added NoSlow module

---
 src/main/java/ftbsc/bscv/modules/self/NoSlow.java | 16 ++++++
 src/main/java/ftbsc/bscv/patches/NoSlowPatch.java | 64 +++++++++++++++++++++++
 2 files changed, 80 insertions(+)
 create mode 100644 src/main/java/ftbsc/bscv/modules/self/NoSlow.java
 create mode 100644 src/main/java/ftbsc/bscv/patches/NoSlowPatch.java

(limited to 'src/main')

diff --git a/src/main/java/ftbsc/bscv/modules/self/NoSlow.java b/src/main/java/ftbsc/bscv/modules/self/NoSlow.java
new file mode 100644
index 0000000..a704ee2
--- /dev/null
+++ b/src/main/java/ftbsc/bscv/modules/self/NoSlow.java
@@ -0,0 +1,16 @@
+package ftbsc.bscv.modules.self;
+
+import com.google.auto.service.AutoService;
+
+import ftbsc.bscv.api.ILoadable;
+import ftbsc.bscv.modules.AbstractModule;
+import ftbsc.bscv.patches.NoSlowPatch.PlayerSlowDownEvent;
+import net.minecraftforge.eventbus.api.SubscribeEvent;
+
+@AutoService(ILoadable.class)
+public class NoSlow extends AbstractModule {
+	@SubscribeEvent
+	public void onPlayerSlowDown(PlayerSlowDownEvent event) {
+		event.setCanceled(true);
+	}
+}
diff --git a/src/main/java/ftbsc/bscv/patches/NoSlowPatch.java b/src/main/java/ftbsc/bscv/patches/NoSlowPatch.java
new file mode 100644
index 0000000..98400ef
--- /dev/null
+++ b/src/main/java/ftbsc/bscv/patches/NoSlowPatch.java
@@ -0,0 +1,64 @@
+package ftbsc.bscv.patches;
+
+import ftbsc.lll.processor.annotations.Injector;
+import ftbsc.lll.processor.annotations.Patch;
+import ftbsc.lll.processor.annotations.Target;
+import ftbsc.lll.tools.InsnSequence;
+import ftbsc.lll.tools.PatternMatcher;
+import net.minecraft.client.entity.player.ClientPlayerEntity;
+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 NoSlowPatch {
+
+	@Cancelable
+	public static class PlayerSlowDownEvent extends Event {	}
+
+	public static boolean shouldSlowPlayer() {
+		return MinecraftForge.EVENT_BUS.post(new PlayerSlowDownEvent());
+	}
+
+	@Patch(value = ClientPlayerEntity.class, reason = "add hook to cancel slowing down effect of using items")
+	public abstract static class SlowDownOverride implements Opcodes {
+		@Target
+		abstract void aiStep();
+
+		@Injector
+		public void inject(ClassNode clazz, MethodNode main) {
+			AbstractInsnNode found = PatternMatcher.builder()
+				.opcodes(ALOAD, INVOKEVIRTUAL, IFEQ, ALOAD, INVOKEVIRTUAL, IFNE)
+				.ignoreFrames()
+				.ignoreLabels()
+				.ignoreLineNumbers()
+				.build()
+				.find(main)
+				.getLast();
+
+			AbstractInsnNode after = PatternMatcher.builder()
+				.opcodes(ALOAD, ICONST_0, PUTFIELD)
+				.ignoreFrames()
+				.ignoreLabels()
+				.ignoreLineNumbers()
+				.build()
+				.find(main)
+				.getLast();
+
+			LabelNode skip = new LabelNode(); // TODO can we get the label that the original IF is jumping to without adding one ourselves?
+			InsnSequence is = new InsnSequence();
+			is.add(new MethodInsnNode(
+				INVOKESTATIC,
+				"ftbsc/bscv/patches/NoSlowPatch",
+				"shouldSlowPlayer",
+				"()Z"
+			));
+			is.add(new JumpInsnNode(IFNE, skip));
+
+			main.instructions.insert(found, is);
+			main.instructions.insert(after, skip);
+		}
+	}
+}
-- 
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