TinkersConstruct/src/main/java/tconstruct/util/ItemHelper.java

package tconstruct.util;

import java.lang.reflect.Field;

import net.minecraft.block.Block;
import net.minecraft.client.Minecraft;
import net.minecraft.client.renderer.RenderBlocks;
import net.minecraft.client.renderer.Tessellator;
import net.minecraft.client.renderer.texture.TextureMap;
import net.minecraft.entity.item.EntityItem;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.util.IIcon;
import net.minecraftforge.event.entity.living.LivingDropsEvent;

import org.lwjgl.opengl.GL11;

import tconstruct.TConstruct;

public class ItemHelper
{
    public static Object getStaticItem (String name, String classPackage)
    {
        try
        {
            Class clazz = Class.forName(classPackage);
            Field field = clazz.getDeclaredField(name);
            Object ret = field.get(null);
            if (ret != null && (ret instanceof ItemStack || ret instanceof Item))
                return ret;
            return null;
        }
        catch (Exception e)
        {
            TConstruct.logger.warn("Could not find " + name + "from " + classPackage);
            return null;
        }
    }

    public static void addDrops (LivingDropsEvent event, ItemStack dropStack)
    {
        EntityItem entityitem = new EntityItem(event.entityLiving.worldObj, event.entityLiving.posX, event.entityLiving.posY, event.entityLiving.posZ, dropStack);
        entityitem.delayBeforeCanPickup = 10;
        event.drops.add(entityitem);
    }

    public static void renderStandardInvBlock (RenderBlocks renderblocks, Block block, int meta)
    {
        Tessellator tessellator = Tessellator.instance;
        GL11.glTranslatef(-0.5F, -0.5F, -0.5F);
        tessellator.startDrawingQuads();
        tessellator.setNormal(0.0F, -1F, 0.0F);
        renderblocks.renderFaceYNeg(block, 0.0D, 0.0D, 0.0D, ItemHelper.getIconSafe(block.getIcon(0, meta)));
        tessellator.draw();
        tessellator.startDrawingQuads();
        tessellator.setNormal(0.0F, 1.0F, 0.0F);
        renderblocks.renderFaceYPos(block, 0.0D, 0.0D, 0.0D, ItemHelper.getIconSafe(block.getIcon(1, meta)));// block.getIcon(1, meta));
        tessellator.draw();
        tessellator.startDrawingQuads();
        tessellator.setNormal(0.0F, 0.0F, -1F);
        renderblocks.renderFaceZNeg(block, 0.0D, 0.0D, 0.0D, ItemHelper.getIconSafe(block.getIcon(2, meta)));
        tessellator.draw();
        tessellator.startDrawingQuads();
        tessellator.setNormal(0.0F, 0.0F, 1.0F);
        renderblocks.renderFaceZPos(block, 0.0D, 0.0D, 0.0D, ItemHelper.getIconSafe(block.getIcon(3, meta)));
        tessellator.draw();
        tessellator.startDrawingQuads();
        tessellator.setNormal(-1F, 0.0F, 0.0F);
        renderblocks.renderFaceXNeg(block, 0.0D, 0.0D, 0.0D, ItemHelper.getIconSafe(block.getIcon(4, meta)));
        tessellator.draw();
        tessellator.startDrawingQuads();
        tessellator.setNormal(1.0F, 0.0F, 0.0F);
        renderblocks.renderFaceXPos(block, 0.0D, 0.0D, 0.0D, ItemHelper.getIconSafe(block.getIcon(5, meta)));
        tessellator.draw();
        GL11.glTranslatef(0.5F, 0.5F, 0.5F);
    }

    public static void renderInvBlockFace (RenderBlocks renderblocks, Block block, int meta)
    {
        Tessellator tessellator = Tessellator.instance;
        GL11.glScalef(2f, 2f, 2f);
        GL11.glTranslatef(-0.5F, -0.5F, -0.5F);
        GL11.glRotatef(45, 0, 1, 0);
        GL11.glRotatef(60, 1, 0, 0);
        tessellator.startDrawingQuads();
        tessellator.setNormal(0.0F, -1F, 0.0F);
        renderblocks.renderFaceYNeg(block, 0.0D, 0.0D, 0.0D, ItemHelper.getIconSafe(block.getIcon(0, meta)));
        tessellator.draw();
        tessellator.startDrawingQuads();
        tessellator.setNormal(0.0F, 1.0F, 0.0F);
        renderblocks.renderFaceYPos(block, 0.0D, 0.0D, 0.0D, ItemHelper.getIconSafe(block.getIcon(1, meta)));
        tessellator.draw();
        tessellator.startDrawingQuads();
        tessellator.setNormal(0.0F, 0.0F, -1F);
        renderblocks.renderFaceZNeg(block, 0.0D, 0.0D, 0.0D, ItemHelper.getIconSafe(block.getIcon(2, meta)));
        tessellator.draw();
        tessellator.startDrawingQuads();
        tessellator.setNormal(0.0F, 0.0F, 1.0F);
        renderblocks.renderFaceZPos(block, 0.0D, 0.0D, 0.0D, ItemHelper.getIconSafe(block.getIcon(3, meta)));
        tessellator.draw();
        tessellator.startDrawingQuads();
        tessellator.setNormal(-1F, 0.0F, 0.0F);
        renderblocks.renderFaceXNeg(block, 0.0D, 0.0D, 0.0D, ItemHelper.getIconSafe(block.getIcon(4, meta)));
        tessellator.draw();
        tessellator.startDrawingQuads();
        tessellator.setNormal(1.0F, 0.0F, 0.0F);
        renderblocks.renderFaceXPos(block, 0.0D, 0.0D, 0.0D, ItemHelper.getIconSafe(block.getIcon(5, meta)));
        tessellator.draw();
        GL11.glTranslatef(0.5F, 0.5F, 0.5F);
    }

    public static IIcon getIconSafe (IIcon icon)
    {
        if (icon != null)
            return icon;
        return ((TextureMap) Minecraft.getMinecraft().getTextureManager().getTexture(TextureMap.locationBlocksTexture)).getAtlasSprite("missingno");
    }
}