BackgroundTextureLoader.cs

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using System;
using System.Collections.Generic;

namespace Terraria.ModLoader
{
    //todo: further documentation
    public static class BackgroundTextureLoader
    {
        public const int vanillaBackgroundTextureCount = Main.maxBackgrounds;
        private static int nextBackground = vanillaBackgroundTextureCount;
        internal static IDictionary<string, int> backgrounds = new Dictionary<string, int>();

        internal static int ReserveBackgroundSlot() {
            int reserve = nextBackground;
            nextBackground++;
            return reserve;
        }

        public static int GetBackgroundSlot(string texture) => backgrounds.TryGetValue(texture, out int slot) ? slot : -1;

        internal static void ResizeAndFillArrays() {
            Array.Resize(ref Main.backgroundTexture, nextBackground);
            Array.Resize(ref Main.backgroundHeight, nextBackground);
            Array.Resize(ref Main.backgroundWidth, nextBackground);
            Array.Resize(ref Main.backgroundLoaded, nextBackground);
            foreach (string texture in backgrounds.Keys) {
                int slot = backgrounds[texture];
                Main.backgroundTexture[slot] = ModContent.GetTexture(texture);
                Main.backgroundWidth[slot] = Main.backgroundTexture[slot].Width;
                Main.backgroundHeight[slot] = Main.backgroundTexture[slot].Height;
                Main.backgroundLoaded[slot] = true;
            }
        }

        internal static void Unload() {
            nextBackground = vanillaBackgroundTextureCount;
            backgrounds.Clear();
        }
    }
}