BlizzardShaderData.cs

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using Microsoft.Xna.Framework;
using Terraria.Graphics.Shaders;
 
namespace Terraria.GameContent.Shaders;
 
public class BlizzardShaderData : ScreenShaderData
{
    private Vector2 _texturePosition = Vector2.Zero;
 
    private float windSpeed = 0.1f;
 
    public BlizzardShaderData(string passName)
        : base(passName)
    {
    }
 
    public override void Update(GameTime gameTime)
    {
        float num = Main.windSpeedCurrent;
        if (num >= 0f && num <= 0.1f)
        {
            num = 0.1f;
        }
        else if (num <= 0f && num >= -0.1f)
        {
            num = -0.1f;
        }
        windSpeed = num * 0.05f + windSpeed * 0.95f;
        Vector2 vector = new Vector2(0f - windSpeed, -1f) * new Vector2(10f, 2f);
        vector.Normalize();
        vector *= new Vector2(0.8f, 0.6f);
        if (!Main.gamePaused && Main.hasFocus)
        {
            _texturePosition += vector * (float)gameTime.ElapsedGameTime.TotalSeconds;
        }
        _texturePosition.X %= 10f;
        _texturePosition.Y %= 10f;
        UseDirection(vector);
        UseTargetPosition(_texturePosition);
        base.Update(gameTime);
    }
 
    public override void Apply()
    {
        UseTargetPosition(_texturePosition);
        base.Apply();
    }
}