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/*
* SPDX-FileCopyrightText: 2024 Linnea Gräf <nea@nea.moe>
*
* SPDX-License-Identifier: GPL-3.0-or-later
*/
package moe.nea.firmament.init;
import me.shedaniel.mm.api.ClassTinkerers;
import net.fabricmc.loader.api.FabricLoader;
import net.fabricmc.loader.api.MappingResolver;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.tree.*;
import java.lang.reflect.Modifier;
import java.util.Objects;
public class EarlyRiser implements Runnable {
MappingResolver remapper = FabricLoader.getInstance().getMappingResolver();
String PlayerEntity = remapper.mapClassName("intermediary", "net.minecraft.class_1657");
String World = remapper.mapClassName("intermediary", "net.minecraft.class_1937");
String GameProfile = "com.mojang.authlib.GameProfile";
String BlockPos = remapper.mapClassName("intermediary", "net.minecraft.class_2338");
String AbstractClientPlayerEntity = remapper.mapClassName("intermediary", "net.minecraft.class_742");
String GuiPlayer = "moe.nea.firmament.gui.entity.GuiPlayer";
// World world, BlockPos pos, float yaw, GameProfile gameProfile
Type constructorDescriptor = Type.getMethodType(Type.VOID_TYPE, getTypeForClassName(World), getTypeForClassName(BlockPos), Type.FLOAT_TYPE, getTypeForClassName(GameProfile));
@Override
public void run() {
ClassTinkerers.addTransformation(AbstractClientPlayerEntity, it -> mapClassNode(it, getTypeForClassName(PlayerEntity)));
ClassTinkerers.addTransformation(GuiPlayer, it -> mapClassNode(it, getTypeForClassName(AbstractClientPlayerEntity)));
}
private void mapClassNode(ClassNode classNode, Type superClass) {
for (MethodNode method : classNode.methods) {
if (Objects.equals(method.name, "<init>") && Type.getMethodType(method.desc).equals(constructorDescriptor)) {
modifyConstructor(method, superClass);
return;
}
}
var node = new MethodNode(Opcodes.ASM9, "<init>", constructorDescriptor.getDescriptor(), null, null);
classNode.methods.add(node);
modifyConstructor(node, superClass);
}
private Type getTypeForClassName(String className) {
return Type.getObjectType(className.replace('.', '/'));
}
private void modifyConstructor(MethodNode method, Type superClass) {
method.access = (method.access | Modifier.PUBLIC) & ~Modifier.PRIVATE & ~Modifier.PROTECTED;
if (method.instructions.size() != 0) return; // Some other mod has already made a constructor here
// World world, BlockPos pos, float yaw, GameProfile gameProfile
// ALOAD this
method.instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
// ALOAD World
method.instructions.add(new VarInsnNode(Opcodes.ALOAD, 1));
// ALOAD BlockPos
method.instructions.add(new VarInsnNode(Opcodes.ALOAD, 2));
// ALOAD yaw
method.instructions.add(new VarInsnNode(Opcodes.FLOAD, 3));
// ALOAD gameProfile
method.instructions.add(new VarInsnNode(Opcodes.ALOAD, 4));
// Call super
method.instructions.add(new MethodInsnNode(Opcodes.INVOKESPECIAL, superClass.getInternalName(), "<init>", constructorDescriptor.getDescriptor(), false));
// Return
method.instructions.add(new InsnNode(Opcodes.RETURN));
}
}
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