TinkersConstruct/src/main/java/tconstruct/client/CustomBowRenderer.java

package tconstruct.client;

import net.minecraft.client.Minecraft;
import net.minecraft.client.renderer.ItemRenderer;
import net.minecraft.client.renderer.RenderBlocks;
import net.minecraft.client.renderer.Tessellator;
import net.minecraft.client.renderer.entity.RenderManager;
import net.minecraft.client.renderer.texture.TextureManager;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.ItemStack;
import net.minecraft.util.IIcon;
import net.minecraftforge.client.IItemRenderer;

import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL12;

public class CustomBowRenderer implements IItemRenderer {

    Minecraft mc = Minecraft.getMinecraft();
    private final RenderBlocks renderBlocksInstance = new RenderBlocks();

    @Override
    public boolean handleRenderType(ItemStack item, ItemRenderType type) {
        return type == ItemRenderType.EQUIPPED || type == ItemRenderType.EQUIPPED_FIRST_PERSON;
    }

    @Override
    public boolean shouldUseRenderHelper(ItemRenderType type, ItemStack item, ItemRendererHelper helper) {
        return true;
    }

    @Override
    public void renderItem(ItemRenderType type, ItemStack item, Object... data) {
        EntityLivingBase living = (EntityLivingBase) data[1];
        ItemRenderer renderer = RenderManager.instance.itemRenderer;
        for (int i = 0; i < item.getItem().getRenderPasses(item.getItemDamage()) + 1; i++)
            renderItem(living, item, i, type);
    }

    public void renderItem(EntityLivingBase living, ItemStack stack, int renderPass, ItemRenderType type) {
        GL11.glPushMatrix();

        IIcon icon;
        if (living instanceof EntityPlayer) {
            EntityPlayer player = (EntityPlayer) living;
            if (player.getItemInUse() != null) icon = stack.getItem()
                    .getIcon(stack, renderPass, player, player.getItemInUse(), player.getItemInUseCount());
            else icon = living.getItemIcon(stack, renderPass);
        } else {
            icon = living.getItemIcon(stack, renderPass);
        }

        if (icon == null) {
            GL11.glPopMatrix();
            return;
        }
        TextureManager texturemanager = this.mc.getTextureManager();
        texturemanager.bindTexture(texturemanager.getResourceLocation(stack.getItemSpriteNumber()));

        if (type == ItemRenderType.EQUIPPED_FIRST_PERSON) {
            GL11.glTranslatef(0.6F, 0.5F, 0.5F);
        } else {
            GL11.glRotatef(180.0F, 0F, 0F, 1.0F);
            GL11.glRotatef(45.0F, 1.0F, 0.0F, 0.75F);
            GL11.glTranslatef(-0.6F, -0.25F, 1.0F);
            GL11.glScalef(1.75F, 1.75F, 1.75F);
        }

        Tessellator tessellator = Tessellator.instance;
        float f = icon.getMinU();
        float f1 = icon.getMaxU();
        float f2 = icon.getMinV();
        float f3 = icon.getMaxV();
        float f4 = 0.0F;
        float f5 = 0.3F;
        GL11.glEnable(GL12.GL_RESCALE_NORMAL);
        GL11.glTranslatef(-f4, -f5, 0.0F);
        float f6 = 1.5F;
        GL11.glScalef(f6, f6, f6);
        GL11.glRotatef(50.0F, 0.0F, 1.0F, 0.0F);
        GL11.glRotatef(335.0F, 0.0F, 0.0F, 1.0F);
        GL11.glTranslatef(-0.9375F, -0.0625F, 0.0F);
        ItemRenderer.renderItemIn2D(tessellator, f1, f2, f, f3, icon.getIconWidth(), icon.getIconHeight(), 0.0625F);

        GL11.glDisable(GL12.GL_RESCALE_NORMAL);

        GL11.glPopMatrix();
    }
}