ActuallyAdditions/src/main/java/de/ellpeck/actuallyadditions/common/misc/special/RenderSpecial.java

package de.ellpeck.actuallyadditions.common.misc.special;

import de.ellpeck.actuallyadditions.common.util.AssetUtil;
import de.ellpeck.actuallyadditions.common.util.StackUtil;
import net.minecraft.client.Minecraft;
import net.minecraft.client.renderer.GlStateManager;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.player.EnumPlayerModelParts;
import net.minecraft.item.ItemBlock;
import net.minecraft.item.ItemStack;
import net.minecraft.util.math.Vec3d;

public class RenderSpecial {

    private final ItemStack theThingToRender;

    public RenderSpecial(ItemStack stack) {
        this.theThingToRender = stack;
    }

    public void render(EntityPlayer player, float partialTicks) {
        if (player.isInvisible() || !player.isWearing(EnumPlayerModelParts.CAPE) || player.isElytraFlying()) { return; }

        GlStateManager.pushMatrix();

        Vec3d currentPos = Minecraft.getMinecraft().player.getPositionEyes(partialTicks);
        Vec3d playerPos = player.getPositionEyes(partialTicks);
        GlStateManager.translate(playerPos.x - currentPos.x, playerPos.y - currentPos.y, playerPos.z - currentPos.z);
        GlStateManager.translate(0D, 2.575D - (player.isSneaking() ? 0.125D : 0D), 0D);

        this.render();
        GlStateManager.popMatrix();
    }

    public void render() {
        if (StackUtil.isValid(this.theThingToRender)) {
            boolean isBlock = this.theThingToRender.getItem() instanceof ItemBlock;

            GlStateManager.pushMatrix();

            if (isBlock) {
                GlStateManager.translate(0D, -0.1875D, 0D);
            }
            GlStateManager.rotate(180F, 1.0F, 0.0F, 1.0F);

            float size = isBlock ? 0.5F : 0.4F;
            GlStateManager.scale(size, size, size);

            //Make the floaty stuff look nice using sine waves \o/ -xdjackiexd
            //Peck edit: What do you mean by "nice" you jackass? >_>
            double boop = Minecraft.getSystemTime() / 1000D;
            GlStateManager.translate(0D, Math.sin(boop % (2 * Math.PI)) * 0.25, 0D);
            GlStateManager.rotate((float) (boop * 40D % 360), 0, 1, 0);

            GlStateManager.disableLighting();
            GlStateManager.pushMatrix();

            if (!isBlock) {
                GlStateManager.translate(0D, 0.5D, 0D);
            }
            GlStateManager.rotate(180F, 1F, 0F, 0F);
            AssetUtil.renderItemInWorld(this.theThingToRender);
            GlStateManager.popMatrix();

            GlStateManager.enableLighting();

            GlStateManager.popMatrix();
        }
    }

}