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ellipsis

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Posts posted by ellipsis

    [SOLVED] Replacing methods in the base Block class using reflection

    in General Discussion

    Posted

    I have some code using ASM that can replace methods in classes that aren't statically initialized, but I'm having trouble replacing Block methods, since it's statically initialized. Can I either reload all classes by recreating the Forge RelaunchClassLoader or plug my custom IClassTransformer into the RelaunchClassLoader before the vanilla classes are loaded?

     

    EDIT: I fixed the problem by making a core mod to handle hooking and then injecting proxy calls to the needed methods.

    Duplicate method name&signature error

    in Modder Support

    Posted

    I'm using the latest version of Forge and I get a crash when I try to run my mod outside of MCP. Here's the crash log:

    ---- Minecraft Crash Report ----
// I let you down. Sorry 

Time: 9/9/12 4:06 PM
Description: Failed to start game

cpw.mods.fml.common.LoaderException: java.lang.reflect.InvocationTargetException
        at cpw.mods.fml.common.LoadController.transition(LoadController.java:102)
        at cpw.mods.fml.common.Loader.initializeMods(Loader.java:625)
        at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:174)
        at net.minecraft.client.Minecraft.a(Minecraft.java:450)
        at net.minecraft.client.Minecraft.run(Minecraft.java:737)
        at java.lang.Thread.run(Thread.java:680)
Caused by: java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:371)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)
        at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
        at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)
        at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)
        at com.google.common.eventbus.EventBus.post(EventBus.java:268)
        at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:124)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)
        at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
        at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)
        at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)
        at com.google.common.eventbus.EventBus.post(EventBus.java:268)
        at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:81)
        at cpw.mods.fml.common.Loader.initializeMods(Loader.java:624)
        ... 4 more
Caused by: java.lang.NoClassDefFoundError: robocraft/common/robots/android/EntityAndroidRobot
        at robocraft.common.RoboCraft.load(RoboCraft.java:86)
        ... 30 more
Caused by: java.lang.ClassNotFoundException: robocraft.common.robots.android.EntityAndroidRobot
        at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:100)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
        ... 31 more
Caused by: java.lang.ClassFormatError: Duplicate method name&signature in class file robocraft/common/robots/android/EntityAndroidRobot
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:466)
        at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:94)
        ... 33 more

Relevant Details:
- Minecraft Version: 1.3.2
- Operating System: Mac OS X (i386) version 10.6.8
- Java Version: 1.6.0_22, Apple Inc.
- Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Apple Inc.
- Memory: 510316592 bytes (486 MB) / 550305792 bytes (524 MB) up to 1070399488 bytes (1020 MB)
- JVM Flags: 3 total; -Xbootclasspath/a:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources/LauncherSupport.jar -Xms512M -Xmx1024M
- FML: FML v3.0.165.344 Minecraft Forge 4.0.0.241 3 mods loaded, 3 mods active
        FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized
        Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized
        ellipsis_RoboCraft [RoboCraft] (robocraft.zip) Unloaded->Constructed->Pre-initialized->Errored
- LWJGL: 2.4.2
- OpenGL: ATI Radeon HD 2400 XT OpenGL Engine GL version 2.1 ATI-1.6.36, ATI Technologies Inc.
- Is Modded: Definitely; 'forge,fml'
- Type: Client
- Texture Pack: Default
- Profiler Position: N/A (disabled)

    and here's the EntityAndroidRobot class:

    package robocraft.common.robots.android;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

import net.minecraft.src.DamageSource;
import net.minecraft.src.Entity;
import net.minecraft.src.EntityItem;
import net.minecraft.src.EntityLightningBolt;
import net.minecraft.src.EntityLiving;
import net.minecraft.src.EntityPlayer;
import net.minecraft.src.IInventory;
import net.minecraft.src.ItemStack;
import net.minecraft.src.NBTTagCompound;
import net.minecraft.src.NBTTagList;
import net.minecraft.src.PotionEffect;
import net.minecraft.src.Vec3;
import net.minecraft.src.World;
import robocraft.common.InventoryRobot;
import robocraft.common.RoboCraft;
import robocraft.common.ai.IRobotController;
import robocraft.common.ai.IRobotControllerItem;
import robocraft.common.ai.pathing.DynamicPathFinder;
import robocraft.common.motion.IMotionModule;
import robocraft.common.motion.IMotionModuleItem;
import robocraft.common.power.IPowerCellItem;
import robocraft.common.power.IPowerSupplier;
import robocraft.common.power.IPowerTransfer;
import robocraft.common.power.IPowerTransferItem;
import robocraft.common.sensors.IRobotSensor;
import robocraft.common.sensors.IRobotSensorItem;
import robocraft.common.tools.IRobotManipulator;
import robocraft.common.tools.IRobotManipulatorItem;
import robocraft.common.upgrades.IRobotUpgrade;
import robocraft.common.upgrades.IRobotUpgradeItem;
import robocraft.util.NBTUtilities;
import cpw.mods.fml.common.Side;
import cpw.mods.fml.common.asm.SideOnly;

public class EntityAndroidRobot extends EntityRobot implements IInventory {
// Item interfaces
private IRobotController controller;
private IRobotSensor sensor;
private IPowerTransfer transfer;
private IMotionModule motion;
private IPowerSupplier battery;
private InventoryRobot inventory;
private IRobotManipulator leftManip, rightManip;
private IRobotUpgrade modules[] = new IRobotUpgrade[6];

// Stacks for the items
private ItemStack controllerStack, sensorStack, manipLeft, manipRight; // Slots
																		// 0-3
private ItemStack powerStack, motionStack, transferStack; // Slots 4-6
private ItemStack upgrades[] = new ItemStack[6];

// Persistant state

// State
private boolean suspended;
private int ticksSinceSync;
private DynamicPathFinder dynPather;

public EntityAndroidRobot(World w) {
	super(w);
	texture = "/robocraft/mob/AndroidRobot.png";

	controller = null;
	sensor = null;
	transfer = null;
	motion = null;
	battery = null;
	leftManip = rightManip = null;
	inventory = new InventoryRobot(this); // The size of a large chest

	controllerStack = sensorStack = manipLeft = manipRight = powerStack = null;
	motionStack = transferStack = null;
	upgrades[0] = upgrades[1] = upgrades[2] = upgrades[3] = upgrades[4] = upgrades[5] = null;

	suspended = false;
	ticksSinceSync = 0;
	this.height = 2.0f;
	this.entityType = "humanoid";

	dynPather = new DynamicPathFinder(worldObj, this, false, false);

	getNavigator().setAvoidSun(false);
	getNavigator().setAvoidsWater(false);
	getNavigator().setBreakDoors(false);
	getNavigator().setCanSwim(true);
	getNavigator().setSpeed(20.0f);
	getNavigator().setEnterDoors(true);
}

@Override
protected void entityInit() {
	super.entityInit();
	dataWatcher.addObject(16, Byte.valueOf((byte) 0));
	dataWatcher.addObject(17, "");
}

private boolean consumeEnergy(float e) {
	if (battery == null)
		return false;
	return (battery.removeEnergy(e) == e);
}

@Override
public void onEntityUpdate() {
	super.onEntityUpdate();

	// Update energy transfer system
	if (transfer != null && battery != null)
		transfer.updateEnergyTransfer(battery, this);

	// Don't run any motion or AI if we're suspended or our battery is dead
	if (battery == null || battery.getEnergy() == 0.0f
			|| (dataWatcher.getWatchableObjectByte(16) == 1)) {
		if (battery != null) {
			battery.tick();
			battery.removeEnergy(0.01f);
		}
		stopMoving();
		this.isJumping = false;
		return;
	}
	battery.tick();
	battery.removeEnergy(0.5f);

	// Update AI module
	if (controller != null) {
		controller.update(this);
		battery.removeEnergy(controller.energyUsageThisTick());
	}

	// Iterate through upgrades
	for (int i = 0; i < 6; i++)
		if (modules[i] != null) {
			modules[i].update(this);
		}
}

@Override
public void onLivingUpdate() {
	super.onLivingUpdate();

	if(isDead) return;

	// Update the important AI stuff
        this.worldObj.theProfiler.startSection("navigation");
        dynPather.update();
        this.worldObj.theProfiler.endSection();
        this.worldObj.theProfiler.startSection("controls");
        this.worldObj.theProfiler.startSection("move");
        getMoveHelper().onUpdateMoveHelper();
        this.worldObj.theProfiler.endStartSection("look");
        getLookHelper().onUpdateLook();
        this.worldObj.theProfiler.endStartSection("jump");
        getJumpHelper().doJump();
        this.worldObj.theProfiler.endSection();
        this.worldObj.theProfiler.endSection();

	// Check collision with items
	List var3 = this.worldObj.getEntitiesWithinAABBExcludingEntity(this,
			this.boundingBox.expand(1.0D, 0.0D, 1.0D));

	if (var3 != null) {
		Iterator var4 = var3.iterator();
		while (var4.hasNext()) {
			Entity var5 = (Entity) var4.next();
			if (!var5.isDead && (var5 instanceof EntityItem)) {
				// Pickup the item
				EntityItem i = (EntityItem) var5;
				if (this.inventory.addItemStackToInventory(i.item)) {
					this.worldObj
							.playSoundAtEntity(
									this,
									"random.pop",
									0.2F,
									((this.rand.nextFloat() - this.rand
											.nextFloat()) * 0.7F + 1.0F) * 2.0F);
					if (i.item.stackSize <= 0)
						i.setDead();
				}
			}
		}
	}
}

@Override
public void updateEntityActionState() {
	// We override this so the robot doesn't turn towards players
}

@Override
public boolean interact(EntityPlayer par1EntityPlayer) {
	if (par1EntityPlayer == null || worldObj == null)
		return false;
	String owner = getOwner();
	if (owner != "" && par1EntityPlayer.username != owner
			&& !RoboCraft.debugging)
		return false;
	par1EntityPlayer.openGui(RoboCraft.instance, 40, worldObj, entityId, 0, 0);
	return true;
}

@Override
public void onStruckByLightning(EntityLightningBolt par1EntityLightningBolt) {
	if (battery != null) {
		float r = battery.addEnergy(1000);
		if (r > 0)
			this.worldObj.createExplosion(this, this.posX, this.posY,
					this.posZ, r / 100);
	}
}

@Override
public void readEntityFromNBT(NBTTagCompound var1) {
	super.readEntityFromNBT(var1);

	// Load inventory info
	NBTUtilities.loadInventory(var1.getTagList("Items"), this);
	inventory.readFromNBT(var1.getTagList("ChestItems"));

	// Construct modules from our inventory
	if (controllerStack != null
			&& (controllerStack.getItem() instanceof IRobotControllerItem)) {
		controller = ((IRobotControllerItem) (controllerStack.getItem()))
				.getControllerInstance(controllerStack);
		controller.initController();
	}
	if (sensorStack != null
			&& (sensorStack.getItem() instanceof IRobotSensorItem))
		sensor = ((IRobotSensorItem) (sensorStack.getItem()))
				.getSensorInstance(sensorStack);
	if (transferStack != null
			&& (transferStack.getItem() instanceof IPowerTransferItem))
		transfer = ((IPowerTransferItem) (transferStack.getItem()))
				.getTransferInstance(transferStack);
	if (motionStack != null
			&& (motionStack.getItem() instanceof IMotionModuleItem))
		motion = ((IMotionModuleItem) (motionStack.getItem()))
				.getModuleInstance(motionStack);
	if (powerStack != null
			&& (powerStack.getItem() instanceof IPowerCellItem))
		battery = ((IPowerCellItem) (powerStack.getItem()))
				.getPowerSupplierInstance(powerStack);
	if (manipLeft != null
			&& (manipLeft.getItem() instanceof IRobotManipulatorItem))
		leftManip = ((IRobotManipulatorItem) (manipLeft.getItem()))
				.getManipulatorInstance(manipLeft);
	if (manipRight != null
			&& (manipRight.getItem() instanceof IRobotManipulatorItem))
		rightManip = ((IRobotManipulatorItem) (manipRight.getItem()))
				.getManipulatorInstance(manipRight);
	for (int i = 0; i < 6; i++)
		if (upgrades[i] != null
				&& (upgrades[i].getItem() instanceof IRobotUpgradeItem))
			modules[i] = ((IRobotUpgradeItem) (upgrades[i].getItem()))
					.getUpgradeInstance(upgrades[i]);

	// Load the owner
	setOwner(var1.getString("Owner"));
}

@Override
public void writeEntityToNBT(NBTTagCompound var1) {
	super.writeEntityToNBT(var1);

	// Make sure all our modules save their states
	if (controller != null)
		controller.forceSave();
	if (sensor != null)
		sensor.forceSave();
	if (transfer != null)
		transfer.forceSave();
	if (motion != null)
		motion.forceSave();
	if (battery != null)
		battery.forceSave();
	if (leftManip != null)
		leftManip.forceSave();
	if (rightManip != null)
		rightManip.forceSave();
	for (int i = 0; i < 6; i++)
		if (modules[i] != null)
			modules[i].forceSave();

	var1.setTag("Items", NBTUtilities.saveInventory(this));
	var1.setTag("ChestItems", inventory.writeToNBT(new NBTTagList()));
	var1.setString("Owner", getOwner());
}

@Override
public int getMaxHealth() {
	return 1;
}

@Override
public boolean attackEntityFrom(DamageSource par1DamageSource, int par2) {
	if (!this.worldObj.isRemote) {
		if (par1DamageSource == DamageSource.inWall)
			return false;
		if (par1DamageSource == DamageSource.starve)
			return false;
		return super.attackEntityFrom(par1DamageSource, par2);
	}
	return false;
}

@Override
protected int applyArmorCalculations(DamageSource par1DamageSource, int par2) {
	return super.applyArmorCalculations(par1DamageSource, par2);
}

@Override
public void onDeath(DamageSource par1DamageSource) {
	System.out.println("On Death on " + ((worldObj.isRemote) ? "Remote" : "Local"));
	// Drop upgrades
	if (controllerStack != null) {
		controller.deinitController();
		this.entityDropItem(controllerStack, 0.2f);
	}
	if (sensorStack != null) {
		this.entityDropItem(sensorStack, 0.2f);
	}
	if (manipLeft != null) {
		this.entityDropItem(manipLeft, 0.2f);
	}
	if (manipRight != null) {
		this.entityDropItem(manipRight, 0.2f);
	}
	if (powerStack != null && !battery.getItem().isVolatile()) {
		this.entityDropItem(powerStack, 0.2f);
	}
	if (motionStack != null) {
		this.entityDropItem(motionStack, 0.2f);
	}
	if (transferStack != null) {
		this.entityDropItem(transferStack, 0.2f);
	}
	for (int i = 0; i < 6; i++)
		if (upgrades[i] != null)
			this.entityDropItem(upgrades[i], 0.2f);

	// Drop items from inventory
	inventory.dropAllItems();

	if (battery != null) {
		if (battery.getItem().isVolatile())
			this.worldObj.createExplosion(this, this.posX, this.posY,
					this.posZ, battery.getEnergy() / 10000);
	}
}

@Override
public boolean canBreatheUnderwater() {
	return true;
}

@Override
protected boolean canDespawn() {
	return false;
}

@Override
@SideOnly(Side.CLIENT)
public ItemStack getHeldItem() {
	return super.getHeldItem();
}

@Override
public boolean isPotionApplicable(PotionEffect par1PotionEffect) {
	return false;
}

@Override
public int getSizeInventory() {
	return 13;
}

@Override
public ItemStack getStackInSlot(int var1) {
	if (var1 <= 6) {
		switch (var1) {
		case 0:
			return controllerStack;
		case 1:
			return sensorStack;
		case 2:
			return manipLeft;
		case 3:
			return manipRight;
		case 4:
			return powerStack;
		case 5:
			return motionStack;
		case 6:
			return transferStack;
		}
	} else {
		return upgrades[var1 - 7];
	}
	return null;
}

@Override
public ItemStack decrStackSize(int var1, int var2) {
	System.out.println("decrStackSize on " + ((worldObj.isRemote) ? "Remote" : "Local"));
	if (getStackInSlot(var1) != null) {
		if (var1 <= 6) {
			// We had a module removed
		} else {
			if (modules[var1 - 7] != null) {
				modules[var1 - 7].deinitModule(this);
				modules[var1 - 7] = null;
			}
		}
		if (getStackInSlot(var1).stackSize <= var2) {
			ItemStack s = getStackInSlot(var1);
			setInventorySlotContents(var1, null);
			onInventoryChanged();
			return s;
		}
		ItemStack s1 = getStackInSlot(var1).splitStack(var2);
		if (getStackInSlot(var1).stackSize == 0)
			setInventorySlotContents(var1, null);
		onInventoryChanged();
		return s1;
	} else {
		return null;
	}
}

@Override
public ItemStack getStackInSlotOnClosing(int var1) {
	return getStackInSlot(var1);
}

@Override
public void setInventorySlotContents(int var1, ItemStack var2) {
	if (var1 <= 6) {
		switch (var1) {
		case 0:
			controllerStack = var2;
			if (var2 != null) {
				controller = ((IRobotControllerItem) var2.getItem())
						.getControllerInstance(var2);
				controller.initController();
			} else if(controller != null) {
				controller.deinitController();
				controller = null;
			}
			break;
		case 1:
			sensorStack = var2;
			if (var2 != null)
				sensor = ((IRobotSensorItem) var2.getItem())
						.getSensorInstance(var2);
			else
				sensor = null;
			break;
		case 2:
			manipLeft = var2;
			if (var2 != null)
				leftManip = ((IRobotManipulatorItem) var2.getItem())
						.getManipulatorInstance(var2);
			else
				leftManip = null;
			break;
		case 3:
			manipRight = var2;
			if (var2 != null)
				rightManip = ((IRobotManipulatorItem) var2.getItem())
						.getManipulatorInstance(var2);
			else
				rightManip = null;
			break;
		case 4:
			powerStack = var2;
			if (var2 != null)
				battery = ((IPowerCellItem) var2.getItem())
						.getPowerSupplierInstance(var2);
			else
				battery = null;
			break;
		case 5:
			motionStack = var2;
			if (var2 != null)
				motion = ((IMotionModuleItem) var2.getItem())
						.getModuleInstance(var2);
			else
				motion = null;
			break;
		case 6:
			transferStack = var2;
			if (var2 != null)
				transfer = ((IPowerTransferItem) var2.getItem())
						.getTransferInstance(var2);
			else
				transfer = null;
			break;
		}
	} else {
		upgrades[var1 - 7] = var2;
		if (var2 != null) {
			modules[var1 - 7] = ((IRobotUpgradeItem) (var2.getItem()))
					.getUpgradeInstance(var2);
			modules[var1 - 7].initModule(this);
		} else if(modules[var1 - 7] != null){
			modules[var1-7].deinitModule(this);
			modules[var1-7] = null;
		}
	}
	if (var2 != null && var2.stackSize > getInventoryStackLimit()) {
		var2.stackSize = getInventoryStackLimit();
	}
	onInventoryChanged();
}

@Override
public String getInvName() {
	return "Android";
}

@Override
public int getInventoryStackLimit() {
	return 1;
}

@Override
public void onInventoryChanged() {
}

@Override
public boolean isUseableByPlayer(EntityPlayer var1) {
	if (worldObj == null)
		return true;
	return var1.getDistanceSq((double) posX + 0.5d, (double) posY + 0.5d,
			(double) posZ + 0.5d) <= 64d;
}

@Override
public void openChest() {
	if (worldObj == null)
		return;
	if(!worldObj.isRemote) dataWatcher.updateObject(16, Byte.valueOf((byte) 1));
}

@Override
public void closeChest() {
	suspended = false;
	if(!worldObj.isRemote) dataWatcher.updateObject(16, Byte.valueOf((byte) 0));
}

@Override
public void lookAt(int x, int y, int z) {
	// Last two are the pitch and yaw velocity
	getLookHelper().setLookPosition(x, y, z, 5, 5);
}

@Override
public void moveTo(int x, int y, int z) {
	// Last one is speed
	dynPather.setTarget(x, y, z);
}

@Override
public boolean isMoving() {
	return dynPather.isMoving();
}

@Override
public void stopMoving() {
	Vec3 lv = getLookVec();
	getLookHelper().setLookPosition(lv.xCoord, lv.yCoord, lv.zCoord, 0, 0);
	getMoveHelper().setMoveTo(this.posX, this.posY, this.posZ, 0);
	dynPather.abort();
}

@Override
public void doJump() {
	getJumpHelper().setJumping();
}

@Override
public void writeRobotState(DataOutputStream s) throws IOException {
}

@Override
public void readRobotState(DataInputStream s) throws IOException {
}

@Override
public int getEntityID() {
	return entityId;
}

@Override
public EntityLiving getEntity() {
	return this;
}

public String getOwner() {
	return dataWatcher.getWatchableObjectString(17);
}

public void setOwner(String s) {
	if(!worldObj.isRemote) dataWatcher.updateObject(17, s);
}

@Override
public IRobotController getController() {
	return controller;
}

@Override
public IInventory getInventory() {
	return inventory;
}

@Override
public IRobotSensor getSensor() {
	return sensor;
}

@Override
public void transmitAIState(DataOutputStream s) {
	// TODO Auto-generated method stub

}

@Override
public void decodeAIState(DataInputStream s) {
	// TODO Auto-generated method stub

}

public DynamicPathFinder getPathFinder() {
	return dynPather;
}
}

     

    I really can't seem to figure this out. Does anyone have any ideas?

    Item tooltip rendering hook

    in Suggestions

    Posted

    I'm making a mod that includes chemistry (among other things), and I have a test tube item. I'm using addInformation to add the amount and some other info, but Minecraft's built in font renderer doesn't support subscripts, which I want to use to draw the chemical formula. I don't want to modify GuiContainer, so a hook for item tooltip rendering would be really useful. This could be implemented by adding an interface "IItemTooltipRenderer", then doing a check in GuiContainer.drawScreen to see if the item is an instance of IItemTooltipRenderer and calling the item's rendering logic instead of the standard logic.

     

    EDIT: Apparently Unicode subscript characters work, but this would still be useful to render icons representing element properties (radiation, acid, flammable, etc)

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