ModDust.cs

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using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using System;
using System.Collections.Generic;
using Terraria.GameContent;
using Terraria.ID;
 
namespace Terraria.ModLoader
{
    public class ModDust
    {
        private static int nextDust = DustID.Count;
        internal static readonly IList<ModDust> dusts = new List<ModDust>();
        public int updateType = -1;
 
        public string Name {
            get;
            internal set;
        }
 
        public Texture2D Texture {
            get;
            internal set;
        }
 
        public Mod mod {
            get;
            internal set;
        }
 
        public int Type {
            get;
            internal set;
        }
 
        internal static int DustCount => nextDust;
 
        public static ModDust GetDust(int type) {
            return type >= DustID.Count && type < DustCount ? dusts[type - DustID.Count] : null;
        }
 
        internal static int ReserveDustID() {
            int reserveID = nextDust;
            nextDust++;
            return reserveID;
        }
        //make Terraria.GameContent.ChildSafety.SafeDust public and not readonly
        internal static void ResizeArrays() {
            Array.Resize(ref ChildSafety.SafeDust, nextDust);
            for (int k = DustID.Count; k < nextDust; k++) {
                ChildSafety.SafeDust[k] = true;
            }
        }
 
        internal static void Unload() {
            dusts.Clear();
            nextDust = DustID.Count;
        }
        //in Terraria.Dust.NewDust after initializing dust properties call ModDust.SetupDust(dust);
        internal static void SetupDust(Dust dust) {
            ModDust modDust = GetDust(dust.type);
            if (modDust != null) {
                dust.frame.X = 0;
                dust.frame.Y %= 30;
                modDust.OnSpawn(dust);
            }
        }
        //in Terraria.Dust.UpdateDust after incrementing Dust.dCount call this
        internal static void SetupUpdateType(Dust dust) {
            ModDust modDust = GetDust(dust.type);
            if (modDust != null && modDust.updateType >= 0) {
                dust.realType = dust.type;
                dust.type = modDust.updateType;
            }
        }
        //in Terraria.Dust.UdpateDust at end of dust update code call this
        internal static void TakeDownUpdateType(Dust dust) {
            if (dust.realType >= 0) {
                dust.type = dust.realType;
                dust.realType = -1;
            }
        }
        //in Terraria.Main.DrawDust before universal dust drawing call
        //  ModDust modDust = ModDust.GetDust(dust.type);
        //  if(modDust != null) { modDust.Draw(dust, color5, scale); continue; }
        internal void Draw(Dust dust, Color alpha, float scale) {
            Main.spriteBatch.Draw(Texture, dust.position - Main.screenPosition, new Microsoft.Xna.Framework.Rectangle?(dust.frame), alpha, dust.rotation, new Vector2(4f, 4f), scale, SpriteEffects.None, 0f);
            if (dust.color != default(Microsoft.Xna.Framework.Color)) {
                Main.spriteBatch.Draw(Texture, dust.position - Main.screenPosition, new Microsoft.Xna.Framework.Rectangle?(dust.frame), dust.GetColor(alpha), dust.rotation, new Vector2(4f, 4f), scale, SpriteEffects.None, 0f);
            }
            if (alpha == Microsoft.Xna.Framework.Color.Black) {
                dust.active = false;
            }
        }
 
        public virtual bool Autoload(ref string name, ref string texture) {
            return mod.Properties.Autoload;
        }
 
        public virtual void SetDefaults() {
        }
 
        public virtual void OnSpawn(Dust dust) {
        }
 
        //in Terraria.Dust.UpdateDust after setting up update type add
        //  ModDust modDust = ModDust.GetDust(dust.type);
        //  if(modDust != null && !modDust.Update(dust)) { ModDust.TakeDownUpdateType(dust); continue; }
        public virtual bool Update(Dust dust) {
            return true;
        }
 
        public virtual bool MidUpdate(Dust dust) {
            return false;
        }
 
        //in beginning of Terraria.Dust.GetAlpha add
        //  ModDust modDust = ModDust.GetDust(this.type);
        //  if(modDust != null)
        //  {
        //      Color? modColor = modDust.GetAlpha(this, newColor);
        //      if(modColor.HasValue)
        //      {
        //          return modColor.Value;
        //      }
        //  }
        public virtual Color? GetAlpha(Dust dust, Color lightColor) {
            return null;
        }
    }
}