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package moe.nea.firmament.init;
import me.shedaniel.mm.api.ClassTinkerers;
import net.minecraft.client.gui.Element;
import net.minecraft.client.gui.ParentElement;
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;
import java.util.function.Consumer;
public class HandledScreenRiser extends RiserUtils {
@IntermediaryName(net.minecraft.client.gui.screen.Screen.class)
String Screen;
@IntermediaryName(net.minecraft.client.gui.screen.ingame.HandledScreen.class)
String HandledScreen;
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());
// boolean keyReleased(int keyCode, int scanCode, int modifiers)
Type keyReleasedDesc = Type.getMethodType(Type.BOOLEAN_TYPE, Type.INT_TYPE, Type.INT_TYPE, Type.INT_TYPE);
String keyReleased = remapper.mapMethodName("intermediary", Intermediary.<Element>className(),
Intermediary.methodName(Element::keyReleased),
keyReleasedDesc.getDescriptor());
@Override
public void addTinkerers() {
ClassTinkerers.addTransformation(HandledScreen, this::addMouseScroll, true);
ClassTinkerers.addTransformation(HandledScreen, this::addKeyReleased, true);
}
/**
* Insert a handler that roughly inserts the following code at the beginning of the instruction list:
* <code><pre>
* if (insertInvoke(insertLoads)) return true
* </pre></code>
*
* @param node The method node to prepend the instructions to
* @param insertLoads insert all the loads, including the {@code this} parameter
* @param insertInvoke insert the invokevirtual/invokestatic call
*/
void insertTrueHandler(MethodNode node,
Consumer<InsnList> insertLoads,
Consumer<InsnList> insertInvoke) {
var insns = new InsnList();
insertLoads.accept(insns);
insertInvoke.accept(insns);
// 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);
node.instructions.insert(insns);
}
void addKeyReleased(ClassNode classNode) {
var keyReleasedNode = findMethod(classNode, keyReleased, keyReleasedDesc);
if (keyReleasedNode == null) {
keyReleasedNode = new MethodNode(
Modifier.PUBLIC,
keyReleased,
keyReleasedDesc.getDescriptor(),
null,
new String[0]
);
var insns = keyReleasedNode.instructions;
// ALOAD 0, load this
insns.add(new VarInsnNode(Opcodes.ALOAD, 0));
// ILOAD 1-3, load args
insns.add(new VarInsnNode(Opcodes.ILOAD, 1));
insns.add(new VarInsnNode(Opcodes.ILOAD, 2));
insns.add(new VarInsnNode(Opcodes.ILOAD, 3));
// INVOKESPECIAL call super method
insns.add(new MethodInsnNode(Opcodes.INVOKESPECIAL, getTypeForClassName(Screen).getInternalName(),
keyReleased, keyReleasedDesc.getDescriptor()));
// IRETURN return int on stack (booleans are int at runtime)
insns.add(new InsnNode(Opcodes.IRETURN));
classNode.methods.add(keyReleasedNode);
}
insertTrueHandler(keyReleasedNode, insns -> {
// ALOAD 0, load this
insns.add(new VarInsnNode(Opcodes.ALOAD, 0));
// ILOAD 1-3, load args
insns.add(new VarInsnNode(Opcodes.ILOAD, 1));
insns.add(new VarInsnNode(Opcodes.ILOAD, 2));
insns.add(new VarInsnNode(Opcodes.ILOAD, 3));
}, insns -> {
// INVOKEVIRTUAL call custom handler
insns.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL,
getTypeForClassName(HandledScreen).getInternalName(),
"keyReleased_firmament",
keyReleasedDesc.getDescriptor()));
});
}
void addMouseScroll(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);
}
insertTrueHandler(mouseScrolledNode, insns -> {
// 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));
}, insns -> {
// INVOKEVIRTUAL call custom handler
insns.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL,
getTypeForClassName(HandledScreen).getInternalName(),
"mouseScrolled_firmament",
mouseScrolledDesc.getDescriptor()));
});
}
}
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