SlimeRainShader.cs

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using System;
using Microsoft.Xna.Framework;
using ReLogic.Peripherals.RGB;
 
namespace Terraria.GameContent.RGB;
 
public class SlimeRainShader : ChromaShader
{
    private static readonly Vector4[] _colors = new Vector4[3]
    {
        Color.Blue.ToVector4(),
        Color.Green.ToVector4(),
        Color.Purple.ToVector4()
    };
 
    [RgbProcessor(/*Could not decode attribute arguments.*/)]
    private void ProcessHighDetail(RgbDevice device, Fragment fragment, EffectDetailLevel quality, float time)
    {
        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) * 7f + time * 0.4f) % 7f - canvasPositionOfIndex.Y;
            Vector4 vector2 = vector;
            if (num > 0f)
            {
                float amount = Math.Max(0f, 1.2f - num);
                if (num < 0.4f)
                {
                    amount = num / 0.4f;
                }
                int num2 = (gridPositionOfIndex.X % _colors.Length + _colors.Length) % _colors.Length;
                vector2 = Vector4.Lerp(vector2, _colors[num2], amount);
            }
            fragment.SetColor(i, vector2);
        }
    }
}