DrawLayer.cs

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using System;
using System.Collections.Generic;

namespace Terraria.ModLoader
{
    public abstract class DrawLayer<InfoType>
    {
        public readonly string mod;
        public readonly string Name;
        public readonly DrawLayer<InfoType> parent;
        public readonly Action<InfoType> layer;
        public bool visible = true;

        protected DrawLayer(string mod, string name, Action<InfoType> layer) {
            this.mod = mod;
            this.Name = name;
            this.parent = null;
            this.layer = layer;
        }

        protected DrawLayer(string mod, string name, DrawLayer<InfoType> parent, Action<InfoType> layer) {
            this.mod = mod;
            this.Name = name;
            this.parent = parent;
            this.layer = layer;
        }

        public bool ShouldDraw<T>(IList<T> layers) where T : DrawLayer<InfoType> {
            if (!this.visible) {
                return false;
            }
            DrawLayer<InfoType> parentLayer = this.parent;
            while (parentLayer != null) {
                if (!parentLayer.visible || !layers.Contains((T)parentLayer)) {
                    return false;
                }
                parentLayer = parentLayer.parent;
            }
            return true;
        }

        public virtual void Draw(ref InfoType drawInfo) {
            this.layer(drawInfo);
        }
    }

    public class PlayerLayer : DrawLayer<PlayerDrawInfo>
    {
        public static readonly PlayerLayer HairBack = CreateVanillaLayer("HairBack");
        public static readonly PlayerLayer MountBack = CreateVanillaLayer("MountBack");
        public static readonly PlayerLayer MiscEffectsBack = CreateVanillaLayer("MiscEffectsBack");
        public static readonly PlayerLayer BackAcc = CreateVanillaLayer("BackAcc");
        public static readonly PlayerLayer Wings = CreateVanillaLayer("Wings");
        public static readonly PlayerLayer BalloonAcc = CreateVanillaLayer("BalloonAcc");
        public static readonly PlayerLayer Skin = CreateVanillaLayer("Skin");
        public static readonly PlayerLayer Legs = CreateVanillaLayer("Legs");
        public static readonly PlayerLayer ShoeAcc = CreateVanillaLayer("ShoeAcc");
        public static readonly PlayerLayer Body = CreateVanillaLayer("Body");
        public static readonly PlayerLayer HandOffAcc = CreateVanillaLayer("HandOffAcc");
        public static readonly PlayerLayer WaistAcc = CreateVanillaLayer("WaistAcc");
        public static readonly PlayerLayer NeckAcc = CreateVanillaLayer("NeckAcc");
        public static readonly PlayerLayer Face = CreateVanillaLayer("Face");
        public static readonly PlayerLayer Hair = CreateVanillaLayer("Hair");
        public static readonly PlayerLayer Head = CreateVanillaLayer("Head");
        public static readonly PlayerLayer FaceAcc = CreateVanillaLayer("FaceAcc");
        public static readonly PlayerLayer MountFront = CreateVanillaLayer("MountFront");
        public static readonly PlayerLayer ShieldAcc = CreateVanillaLayer("ShieldAcc");
        public static readonly PlayerLayer SolarShield = CreateVanillaLayer("SolarShield");
        public static readonly PlayerLayer HeldProjBack = CreateVanillaLayer("HeldProjBack");
        public static readonly PlayerLayer HeldItem = CreateVanillaLayer("HeldItem");
        public static readonly PlayerLayer Arms = CreateVanillaLayer("Arms");
        public static readonly PlayerLayer HandOnAcc = CreateVanillaLayer("HandOnAcc");
        public static readonly PlayerLayer HeldProjFront = CreateVanillaLayer("HeldProjFront");
        public static readonly PlayerLayer FrontAcc = CreateVanillaLayer("FrontAcc");
        public static readonly PlayerLayer MiscEffectsFront = CreateVanillaLayer("MiscEffectsFront");

        public PlayerLayer(string mod, string name, Action<PlayerDrawInfo> layer)
            : base(mod, name, layer) {
        }

        public PlayerLayer(string mod, string name, PlayerLayer parent, Action<PlayerDrawInfo> layer)
            : base(mod, name, parent, layer) {
        }

        private static PlayerLayer CreateVanillaLayer(string name) {
            return new PlayerLayer("Terraria", name, _ => { });
        }
    }

    public class PlayerHeadLayer : DrawLayer<PlayerHeadDrawInfo>
    {
        public static readonly PlayerHeadLayer Head = CreateVanillaLayer("Head");
        public static readonly PlayerHeadLayer Hair = CreateVanillaLayer("Hair");
        public static readonly PlayerHeadLayer AltHair = CreateVanillaLayer("AltHair");
        public static readonly PlayerHeadLayer Armor = CreateVanillaLayer("Armor");
        public static readonly PlayerHeadLayer FaceAcc = CreateVanillaLayer("FaceAcc");

        public PlayerHeadLayer(string mod, string name, Action<PlayerHeadDrawInfo> layer)
            : base(mod, name, layer) {
        }

        public PlayerHeadLayer(string mod, string name, PlayerHeadLayer parent, Action<PlayerHeadDrawInfo> layer)
            : base(mod, name, parent, layer) {
        }

        private static PlayerHeadLayer CreateVanillaLayer(string name) {
            return new PlayerHeadLayer("Terraria", name, _ => { });
        }
    }
}