NebulaSky.cs

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using System;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using ReLogic.Content;
using Terraria.Graphics.Effects;
using Terraria.Utilities;
 
namespace Terraria.GameContent.Skies;
 
public class NebulaSky : CustomSky
{
    private struct LightPillar
    {
        public Vector2 Position;
 
        public float Depth;
    }
 
    private LightPillar[] _pillars;
 
    private UnifiedRandom _random = new UnifiedRandom();
 
    private Asset<Texture2D> _planetTexture;
 
    private Asset<Texture2D> _bgTexture;
 
    private Asset<Texture2D> _beamTexture;
 
    private Asset<Texture2D>[] _rockTextures;
 
    private bool _isActive;
 
    private float _fadeOpacity;
 
    public override void OnLoad()
    {
        _planetTexture = Main.Assets.Request<Texture2D>("Images/Misc/NebulaSky/Planet", (AssetRequestMode)1);
        _bgTexture = Main.Assets.Request<Texture2D>("Images/Misc/NebulaSky/Background", (AssetRequestMode)1);
        _beamTexture = Main.Assets.Request<Texture2D>("Images/Misc/NebulaSky/Beam", (AssetRequestMode)1);
        _rockTextures = new Asset<Texture2D>[3];
        for (int i = 0; i < _rockTextures.Length; i++)
        {
            _rockTextures[i] = Main.Assets.Request<Texture2D>("Images/Misc/NebulaSky/Rock_" + i, (AssetRequestMode)1);
        }
    }
 
    public override void Update(GameTime gameTime)
    {
        if (_isActive)
        {
            _fadeOpacity = Math.Min(1f, 0.01f + _fadeOpacity);
        }
        else
        {
            _fadeOpacity = Math.Max(0f, _fadeOpacity - 0.01f);
        }
    }
 
    public override Color OnTileColor(Color inColor)
    {
        return new Color(Vector4.Lerp(inColor.ToVector4(), Vector4.One, _fadeOpacity * 0.5f));
    }
 
    public override void Draw(SpriteBatch spriteBatch, float minDepth, float maxDepth)
    {
        if (maxDepth >= float.MaxValue && minDepth < float.MaxValue)
        {
            spriteBatch.Draw(TextureAssets.BlackTile.Value, new Rectangle(0, 0, Main.screenWidth, Main.screenHeight), Color.Black * _fadeOpacity);
            spriteBatch.Draw(_bgTexture.Value, new Rectangle(0, Math.Max(0, (int)((Main.worldSurface * 16.0 - (double)Main.screenPosition.Y - 2400.0) * 0.10000000149011612)), Main.screenWidth, Main.screenHeight), Color.White * Math.Min(1f, (Main.screenPosition.Y - 800f) / 1000f * _fadeOpacity));
            Vector2 vector = new Vector2(Main.screenWidth >> 1, Main.screenHeight >> 1);
            Vector2 vector2 = 0.01f * (new Vector2((float)Main.maxTilesX * 8f, (float)Main.worldSurface / 2f) - Main.screenPosition);
            spriteBatch.Draw(_planetTexture.Value, vector + new Vector2(-200f, -200f) + vector2, null, Color.White * 0.9f * _fadeOpacity, 0f, new Vector2(_planetTexture.Width() >> 1, _planetTexture.Height() >> 1), 1f, SpriteEffects.None, 1f);
        }
        int num = -1;
        int num2 = 0;
        for (int i = 0; i < _pillars.Length; i++)
        {
            float depth = _pillars[i].Depth;
            if (num == -1 && depth < maxDepth)
            {
                num = i;
            }
            if (depth <= minDepth)
            {
                break;
            }
            num2 = i;
        }
        if (num == -1)
        {
            return;
        }
        Vector2 vector3 = Main.screenPosition + new Vector2(Main.screenWidth >> 1, Main.screenHeight >> 1);
        Rectangle rectangle = new Rectangle(-1000, -1000, 4000, 4000);
        float num3 = Math.Min(1f, (Main.screenPosition.Y - 1000f) / 1000f);
        for (int j = num; j < num2; j++)
        {
            Vector2 vector4 = new Vector2(1f / _pillars[j].Depth, 0.9f / _pillars[j].Depth);
            Vector2 position = _pillars[j].Position;
            position = (position - vector3) * vector4 + vector3 - Main.screenPosition;
            if (rectangle.Contains((int)position.X, (int)position.Y))
            {
                float num4 = vector4.X * 450f;
                spriteBatch.Draw(_beamTexture.Value, position, null, Color.White * 0.2f * num3 * _fadeOpacity, 0f, Vector2.Zero, new Vector2(num4 / 70f, num4 / 45f), SpriteEffects.None, 0f);
                int num5 = 0;
                for (float num6 = 0f; num6 <= 1f; num6 += 0.03f)
                {
                    float num7 = 1f - (num6 + Main.GlobalTimeWrappedHourly * 0.02f + (float)Math.Sin(j)) % 1f;
                    spriteBatch.Draw(_rockTextures[num5].Value, position + new Vector2((float)Math.Sin(num6 * 1582f) * (num4 * 0.5f) + num4 * 0.5f, num7 * 2000f), null, Color.White * num7 * num3 * _fadeOpacity, num7 * 20f, new Vector2(_rockTextures[num5].Width() >> 1, _rockTextures[num5].Height() >> 1), 0.9f, SpriteEffects.None, 0f);
                    num5 = (num5 + 1) % _rockTextures.Length;
                }
            }
        }
    }
 
    public override float GetCloudAlpha()
    {
        return (1f - _fadeOpacity) * 0.3f + 0.7f;
    }
 
    public override void Activate(Vector2 position, params object[] args)
    {
        _fadeOpacity = 0.002f;
        _isActive = true;
        _pillars = new LightPillar[40];
        for (int i = 0; i < _pillars.Length; i++)
        {
            _pillars[i].Position.X = (float)i / (float)_pillars.Length * ((float)Main.maxTilesX * 16f + 20000f) + _random.NextFloat() * 40f - 20f - 20000f;
            _pillars[i].Position.Y = _random.NextFloat() * 200f - 2000f;
            _pillars[i].Depth = _random.NextFloat() * 8f + 7f;
        }
        Array.Sort(_pillars, SortMethod);
    }
 
    private int SortMethod(LightPillar pillar1, LightPillar pillar2)
    {
        return pillar2.Depth.CompareTo(pillar1.Depth);
    }
 
    public override void Deactivate(params object[] args)
    {
        _isActive = false;
    }
 
    public override void Reset()
    {
        _isActive = false;
    }
 
    public override bool IsActive()
    {
        if (!_isActive)
        {
            return _fadeOpacity > 0.001f;
        }
        return true;
    }
}