ModGore.cs

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using Microsoft.Xna.Framework;
using System;
using System.Collections.Generic;
using Terraria.GameContent;
using Terraria.ID;

namespace Terraria.ModLoader
{
    public class ModGore
    {
        private static int nextGore = GoreID.Count;
        public static int GoreCount => nextGore;
        internal static readonly IDictionary<string, int> gores = new Dictionary<string, int>();
        internal static readonly IDictionary<int, ModGore> modGores = new Dictionary<int, ModGore>();

        public int updateType = -1;

        internal static int ReserveGoreID() {
            int reserveID = nextGore;
            nextGore++;
            return reserveID;
        }

        public static int GetGoreSlot(string texture) {
            if (gores.ContainsKey(texture)) {
                return gores[texture];
            }
            else {
                return 0;
            }
        }

        //in Terraria.GameContent.ChildSafety make SafeGore internal and not readonly
        internal static void ResizeAndFillArrays() {
            Array.Resize(ref Main.goreLoaded, nextGore);
            Array.Resize(ref Main.goreTexture, nextGore);
            Array.Resize(ref ChildSafety.SafeGore, nextGore);
            Array.Resize(ref GoreID.Sets.SpecialAI, nextGore);
            Array.Resize(ref GoreID.Sets.DisappearSpeed, nextGore);
            Array.Resize(ref GoreID.Sets.DisappearSpeedAlpha, nextGore);
            for (int k = GoreID.Count; k < nextGore; k++) {
                Main.goreLoaded[k] = true;
                GoreID.Sets.DisappearSpeed[k] = 1;
                GoreID.Sets.DisappearSpeedAlpha[k] = 1;
            }
            foreach (string texture in gores.Keys) {
                Main.goreTexture[gores[texture]] = ModContent.GetTexture(texture);
            }
        }

        internal static void Unload() {
            gores.Clear();
            modGores.Clear();
            nextGore = GoreID.Count;
        }

        //in Terraria.Gore add modGore property (internal set)
        //in Terraria.Gore.NewGore after resetting properties call ModGore.SetupGore(Main.gore[num]);
        internal static void SetupGore(Gore gore) {
            if (modGores.ContainsKey(gore.type)) {
                gore.modGore = modGores[gore.type];
                gore.modGore.OnSpawn(gore);
            }
            else {
                gore.modGore = null;
            }
        }

        internal static void SetupUpdateType(Gore gore) {
            if (gore.modGore != null && gore.modGore.updateType > 0) {
                gore.realType = gore.type;
                gore.type = gore.modGore.updateType;
            }
        }

        internal static void TakeDownUpdateType(Gore gore) {
            if (gore.realType > 0) {
                gore.type = gore.realType;
                gore.realType = 0;
            }
        }

        //in Terraria.Main.DrawGore and DrawGoreBehind replace type checks with this
        internal static bool DrawBackGore(Gore gore) {
            if (gore.modGore != null) {
                return gore.modGore.DrawBehind(gore);
            }
            return ((gore.type >= 706 && gore.type <= 717) || gore.type == 943) && (gore.frame < 7 || gore.frame > 9);
        }

        public virtual void OnSpawn(Gore gore) {
        }

        //in Terraria.Gore.Update at beginning of if block checking for active add
        //  if(this.modGore != null && !this.modGore.Update(this)) { return; }
        public virtual bool Update(Gore gore) {
            return true;
        }

        //at beginning of Terraria.Gore.Update add
        //  if(this.modGore != null) { Color? modColor = this.modGore.GetAlpha(this, newColor);
        //    if(modColor.HasValue) { return modColor.Value; } }
        public virtual Color? GetAlpha(Gore gore, Color lightColor) {
            return null;
        }

        public virtual bool DrawBehind(Gore gore) {
            return false;
        }
    }
}