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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 org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.tree.InsnList;
import org.objectweb.asm.tree.InsnNode;
import org.objectweb.asm.tree.JumpInsnNode;
import org.objectweb.asm.tree.LabelNode;
import org.objectweb.asm.tree.LdcInsnNode;
import org.objectweb.asm.tree.MethodInsnNode;
import org.objectweb.asm.tree.MethodNode;
import org.objectweb.asm.tree.VarInsnNode;
import java.lang.reflect.Modifier;
public class HandledScreenRiser extends RiserUtils {
String Screen = remapper.mapClassName("intermediary", "net.minecraft.class_437");
String HandledScreen = remapper.mapClassName("intermediary", "net.minecraft.class_465");
Type mouseScrolledDesc = Type.getMethodType(Type.BOOLEAN_TYPE, Type.DOUBLE_TYPE, Type.DOUBLE_TYPE, Type.DOUBLE_TYPE, Type.DOUBLE_TYPE);
String mouseScrolled = remapper.mapMethodName("intermediary", "net.minecraft.class_364", "method_25401",
mouseScrolledDesc.getDescriptor());
@Override
public void addTinkerers() {
ClassTinkerers.addTransformation(HandledScreen, this::handle);
}
void handle(ClassNode classNode) {
MethodNode mouseScrolledNode = findMethod(classNode, mouseScrolled, mouseScrolledDesc);
if (mouseScrolledNode == null) {
mouseScrolledNode = new MethodNode(
Modifier.PUBLIC,
mouseScrolled,
mouseScrolledDesc.getDescriptor(),
null,
new String[0]
);
var insns = mouseScrolledNode.instructions;
// ALOAD 0, load this
insns.add(new VarInsnNode(Opcodes.ALOAD, 0));
// DLOAD 1-4, load the 4 argument doubles. Note that since doubles are two entries wide we skip 2 each time.
insns.add(new VarInsnNode(Opcodes.DLOAD, 1));
insns.add(new VarInsnNode(Opcodes.DLOAD, 3));
insns.add(new VarInsnNode(Opcodes.DLOAD, 5));
insns.add(new VarInsnNode(Opcodes.DLOAD, 7));
// INVOKESPECIAL call super method
insns.add(new MethodInsnNode(Opcodes.INVOKESPECIAL, getTypeForClassName(Screen).getInternalName(), mouseScrolled, mouseScrolledDesc.getDescriptor()));
// IRETURN return int on stack (booleans are int at runtime)
insns.add(new InsnNode(Opcodes.IRETURN));
classNode.methods.add(mouseScrolledNode);
}
var insns = new InsnList();
// ALOAD 0, load this
insns.add(new VarInsnNode(Opcodes.ALOAD, 0));
// DLOAD 1-4, load the 4 argument doubles. Note that since doubles are two entries wide we skip 2 each time.
insns.add(new VarInsnNode(Opcodes.DLOAD, 1));
insns.add(new VarInsnNode(Opcodes.DLOAD, 3));
insns.add(new VarInsnNode(Opcodes.DLOAD, 5));
insns.add(new VarInsnNode(Opcodes.DLOAD, 7));
// INVOKEVIRTUAL call custom handler
insns.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL,
getTypeForClassName(HandledScreen).getInternalName(),
"mouseScrolled_firmament",
mouseScrolledDesc.getDescriptor()));
// Create jump target (but not insert it yet)
var jumpIfFalse = new LabelNode();
// IFEQ (if returned boolean == 0), jump to jumpIfFalse
insns.add(new JumpInsnNode(Opcodes.IFEQ, jumpIfFalse));
// LDC 1 (as int, which is what booleans are at runtime)
insns.add(new LdcInsnNode(1));
// IRETURN return int on stack (booleans are int at runtime)
insns.add(new InsnNode(Opcodes.IRETURN));
insns.add(jumpIfFalse);
mouseScrolledNode.instructions.insert(insns);
}
}
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