MoonLordScreenShaderData.cs

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using Terraria.Graphics.Shaders;
 
namespace Terraria.GameContent.Shaders;
 
public class MoonLordScreenShaderData : ScreenShaderData
{
    private int _moonLordIndex = -1;
 
    private bool _aimAtPlayer;
 
    public MoonLordScreenShaderData(string passName, bool aimAtPlayer)
        : base(passName)
    {
        _aimAtPlayer = aimAtPlayer;
    }
 
    private void UpdateMoonLordIndex()
    {
        if (_aimAtPlayer || (_moonLordIndex >= 0 && Main.npc[_moonLordIndex].active && Main.npc[_moonLordIndex].type == 398))
        {
            return;
        }
        int moonLordIndex = -1;
        for (int i = 0; i < Main.npc.Length; i++)
        {
            if (Main.npc[i].active && Main.npc[i].type == 398)
            {
                moonLordIndex = i;
                break;
            }
        }
        _moonLordIndex = moonLordIndex;
    }
 
    public override void Apply()
    {
        UpdateMoonLordIndex();
        if (_aimAtPlayer)
        {
            UseTargetPosition(Main.LocalPlayer.Center);
        }
        else if (_moonLordIndex != -1)
        {
            UseTargetPosition(Main.npc[_moonLordIndex].Center);
        }
        base.Apply();
    }
}