RainShader.cs

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using System;
using Microsoft.Xna.Framework;
using ReLogic.Peripherals.RGB;
 
namespace Terraria.GameContent.RGB;
 
public class RainShader : ChromaShader
{
    private bool _inBloodMoon;
 
    public override void Update(float elapsedTime)
    {
        _inBloodMoon = Main.bloodMoon;
    }
 
    [RgbProcessor(/*Could not decode attribute arguments.*/)]
    private void ProcessHighDetail(RgbDevice device, Fragment fragment, EffectDetailLevel quality, float time)
    {
        Vector4 value = ((!_inBloodMoon) ? new Vector4(0f, 0f, 1f, 1f) : new Vector4(1f, 0f, 0f, 1f));
        Vector4 vector = new Vector4(0f, 0f, 0f, 0.75f);
        for (int i = 0; i < fragment.Count; i++)
        {
            Point gridPositionOfIndex = fragment.GetGridPositionOfIndex(i);
            Vector2 canvasPositionOfIndex = fragment.GetCanvasPositionOfIndex(i);
            float num = (NoiseHelper.GetStaticNoise(gridPositionOfIndex.X) * 10f + time) % 10f - canvasPositionOfIndex.Y;
            Vector4 vector2 = vector;
            if (num > 0f)
            {
                float amount = Math.Max(0f, 1.2f - num);
                if (num < 0.2f)
                {
                    amount = num * 5f;
                }
                vector2 = Vector4.Lerp(vector2, value, amount);
            }
            fragment.SetColor(i, vector2);
        }
    }
}