minecraft-kajetans-mod/src/main/java/me/km/utils/ClientReflectionUtils.java

package me.km.utils;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Map;
import me.km.overrides.ModPlayerRenderer;
import static me.km.utils.ReflectionUtils.getField;
import static me.km.utils.ReflectionUtils.getMethod;
import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.overlay.BossOverlayGui;
import net.minecraft.client.renderer.entity.EntityRenderer;
import net.minecraft.client.renderer.entity.EntityRendererManager;
import net.minecraft.client.renderer.entity.LivingRenderer;
import net.minecraft.client.renderer.entity.PlayerRenderer;
import net.minecraft.entity.Entity;
import net.minecraft.entity.LivingEntity;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.api.distmarker.OnlyIn;
import org.apache.logging.log4j.LogManager;

@OnlyIn(Dist.CLIENT)
public class ClientReflectionUtils
{
    private final static Method CAN_RENDER_NAME = getMethod(EntityRenderer.class, "func_177070_b", Entity.class);
    private final static Method RENDER_ENTITY_NAME = getMethod(EntityRenderer.class, "func_188296_a", Entity.class, double.class, double.class, double.class, String.class, double.class);
    
    public static boolean canRenderName(EntityRenderer lr, Entity liv)
    {
        try
        {
            return (boolean) CAN_RENDER_NAME.invoke(lr, liv);
        }
        catch(Exception ex)
        {
            LogManager.getLogger().warn("canRenderName - " + ex);
            return false;
        }
    }
    
    public static void renderEntityName(LivingRenderer lr, LivingEntity liv, double x, double y, double z, String name, double distanceSq)
    {
        try
        {
            RENDER_ENTITY_NAME.invoke(lr, liv, x, y, z, name, distanceSq);
        }
        catch(Exception ex)
        {
            LogManager.getLogger().warn("renderEntityName - " + ex);
        }
    }
    
    private final static Field BOSS_BAR_MAP = getField(BossOverlayGui.class, "field_184060_g");

    public static boolean isRenderingBossBar()
    {
        return !ReflectionUtils.getFieldValue(Map.class, Minecraft.getInstance().ingameGUI.getBossOverlay(), BOSS_BAR_MAP).isEmpty();
    }
    
    private final static Field SKIN_MAP = getField(EntityRendererManager.class, "field_178636_l"); // skinMap
    private final static Field PLAYER_RENDERER = getField(EntityRendererManager.class, "field_178637_m"); // playerRenderer
    
    public static void updatePlayerRenderer()
    {
        EntityRendererManager erm = Minecraft.getInstance().getRenderManager();
        ModPlayerRenderer normal = new ModPlayerRenderer(erm, false);
        ModPlayerRenderer slim = new ModPlayerRenderer(erm, true);
        
        ReflectionUtils.setFieldValue(erm, PLAYER_RENDERER, normal);
        Map<String, PlayerRenderer> map = 
                ReflectionUtils.getFieldValue(Map.class, erm, SKIN_MAP);       
        map.put("default", normal);
        map.put("slim", slim);
    }
}