I'm trying to set the color of an ItemStack based on 3 nbt int (Corresponding to rgb)  But I cant seem to figure out how to change the color ingame.

package com.ashindigo.alloycraft.items;

import java.awt.Color;
import java.util.List;

import org.lwjgl.LWJGLException;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GLContext;

import net.minecraft.client.renderer.color.IItemColor;
import net.minecraft.client.renderer.color.ItemColors;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.entity.Entity;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.init.Items;
import net.minecraft.item.Item;
import net.minecraft.item.ItemArmor;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.util.ResourceLocation;
import net.minecraft.world.World;
import net.minecraftforge.fml.common.FMLCommonHandler;
import net.minecraftforge.fml.common.registry.GameRegistry;
import net.minecraftforge.fml.relauncher.Side;

public class AlloyItem extends Item {

public AlloyItem(String modid, String name){
	super();
	setUnlocalizedName(modid + "_" + name);
	setCreativeTab(CreativeTabs.MISC);
	GameRegistry.register(this, new ResourceLocation(modid, name));
	maxStackSize = 1;
}
@Override
public void onCreated(ItemStack itemstack, World world, EntityPlayer player) {
	GL11.glColor3d(255, 255, 255);
        if (itemstack.getTagCompound() == null)
        {
            itemstack.setTagCompound(new NBTTagCompound());
            itemstack.getTagCompound().setInteger("Durability", 0);
            itemstack.getTagCompound().setInteger("Enchantability", 0);
            itemstack.getTagCompound().setInteger("Strength", 0);
        }

ItemColors itemcolors = new ItemColors();
        itemcolors.registerItemColorHandler(new IItemColor()
        {
            public int getColorFromItemstack(ItemStack stack, int tintIndex)
            {
                return tintIndex > 0 ? -1 : ((ItemArmor)stack.getItem()).getColor(stack);
            }
        }, new Item[] {this});
}
public void addInformation(ItemStack itemStack, EntityPlayer par2EntityPlayer, List par3List, boolean par4)
    {
	if (itemStack.getTagCompound() != null) {
	par3List.add("§4Strength: §7" + Integer.toString(itemStack.getTagCompound().getInteger("Strength")));
	par3List.add("§2Durability: §7" + Integer.toString(itemStack.getTagCompound().getInteger("Durability")));
	par3List.add("§1Enchantability: §7" + Integer.toString(itemStack.getTagCompound().getInteger("Enchantability")));
	}
}
@Override
public void onUpdate(ItemStack stack, World worldIn, Entity entityIn, int itemSlot, boolean isSelected) {
	if (FMLCommonHandler.instance().getSide() == Side.CLIENT) {
	//GL11.glBegin(0); 
	GL11.glColor3d(255, 255, 255);
	//GL11.glEnd();
	}
}
}

 

But if I try to launch with the OpenGL code then I crash with this stacktrace

 

Caused by: java.lang.RuntimeException: No OpenGL context found in the current thread.
at org.lwjgl.opengl.GLContext.getCapabilities(GLContext.java:124) ~[lwjgl-2.9.4-nightly-20150209.jar:?]
at org.lwjgl.opengl.GL11.glColor3d(GL11.java:867) ~[lwjgl-2.9.4-nightly-20150209.jar:?]
at com.ashindigo.alloycraft.items.AlloyItem.onUpdate(AlloyItem.java:58) ~[AlloyItem.class:?]
at net.minecraft.item.ItemStack.updateAnimation(ItemStack.java:526) ~[itemStack.class:?]
at net.minecraft.entity.player.InventoryPlayer.decrementAnimations(InventoryPlayer.java:389) ~[inventoryPlayer.class:?]
at net.minecraft.entity.player.EntityPlayer.onLivingUpdate(EntityPlayer.java:559) ~[EntityPlayer.class:?]
at net.minecraft.entity.EntityLivingBase.onUpdate(EntityLivingBase.java:2218) ~[EntityLivingBase.class:?]
at net.minecraft.entity.player.EntityPlayer.onUpdate(EntityPlayer.java:259) ~[EntityPlayer.class:?]
at net.minecraft.entity.player.EntityPlayerMP.onUpdateEntity(EntityPlayerMP.java:341) ~[EntityPlayerMP.class:?]
at net.minecraft.network.NetHandlerPlayServer.update(NetHandlerPlayServer.java:174) ~[NetHandlerPlayServer.class:?]
at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher$1.update(NetworkDispatcher.java:215) ~[NetworkDispatcher$1.class:?]
at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:308) ~[NetworkManager.class:?]
at net.minecraft.network.NetworkSystem.networkTick(NetworkSystem.java:195) ~[NetworkSystem.class:?]
... 5 more

 

And the ItemColor#registerItemColorHandler fails too

Why did you do this

 

@Override
public void onCreated(ItemStack itemstack, World world, EntityPlayer player) {
                // This GL call
	GL11.glColor3d(255, 255, 255);
        if (itemstack.getTagCompound() == null)
        {
            itemstack.setTagCompound(new NBTTagCompound());
            itemstack.getTagCompound().setInteger("Durability", 0);
            itemstack.getTagCompound().setInteger("Enchantability", 0);
            itemstack.getTagCompound().setInteger("Strength", 0);
        }
}

 

Also you are registering a ItemColorHandler every item update tick.

I had readded this since I removed before since it didnt work and put it in the wrong method oops. Ill just edit my post to fix that real quick. The GL11 call was me trying to set the color of the item but this is my first time with gl11

Do not use OpenGL in your

Item

class. Do not create your own

ItemColors

instance. Do not try to register an

IItemColor

every tick.

 

In init, get Minecraft's

ItemColors

instance (

Minecraft#getItemColors

) and then create and register a single

IItemColor

for your

Item

. In the

IItemColor

implementation, use the three integers stored in the

ItemStack

's NBT to determine the colour to return. The format is

r << 16 | g << 8 | b

(where

r

,

g

and

b

are the red, green and blue components of the colour).

It works thank you so much!