FrostLegionShader.cs

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using Microsoft.Xna.Framework;
using ReLogic.Peripherals.RGB;
 
namespace Terraria.GameContent.RGB;
 
public class FrostLegionShader : ChromaShader
{
    private readonly Vector4 _primaryColor;
 
    private readonly Vector4 _secondaryColor;
 
    public FrostLegionShader(Color primaryColor, Color secondaryColor)
    {
        _primaryColor = primaryColor.ToVector4();
        _secondaryColor = secondaryColor.ToVector4();
    }
 
    [RgbProcessor(/*Could not decode attribute arguments.*/)]
    private void ProcessHighDetail(RgbDevice device, Fragment fragment, EffectDetailLevel quality, float time)
    {
        for (int i = 0; i < fragment.Count; i++)
        {
            Vector2 canvasPositionOfIndex = fragment.GetCanvasPositionOfIndex(i);
            float staticNoise = NoiseHelper.GetStaticNoise(fragment.GetGridPositionOfIndex(i).X / 2);
            float num = (canvasPositionOfIndex.Y + canvasPositionOfIndex.X / 2f - staticNoise + time) % 2f;
            if (num < 0f)
            {
                num += 2f;
            }
            if (num < 0.2f)
            {
                num = 1f - num / 0.2f;
            }
            float amount = num / 2f;
            Vector4 vector = Vector4.Lerp(_primaryColor, _secondaryColor, amount);
            fragment.SetColor(i, vector);
        }
    }
}