SkullShader.cs

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using System;
using Microsoft.Xna.Framework;
using ReLogic.Peripherals.RGB;
 
namespace Terraria.GameContent.RGB;
 
public class SkullShader : ChromaShader
{
    private readonly Vector4 _skullColor;
 
    private readonly Vector4 _bloodDark;
 
    private readonly Vector4 _bloodLight;
 
    private readonly Vector4 _backgroundColor = Color.Black.ToVector4();
 
    public SkullShader(Color skullColor, Color bloodDark, Color bloodLight)
    {
        _skullColor = skullColor.ToVector4();
        _bloodDark = bloodDark.ToVector4();
        _bloodLight = bloodLight.ToVector4();
    }
 
    [RgbProcessor(/*Could not decode attribute arguments.*/)]
    private void ProcessLowDetail(RgbDevice device, Fragment fragment, EffectDetailLevel quality, float time)
    {
        for (int i = 0; i < fragment.Count; i++)
        {
            Vector2 canvasPositionOfIndex = fragment.GetCanvasPositionOfIndex(i);
            Vector4 vector = Vector4.Lerp(_skullColor, _bloodLight, (float)Math.Sin(time * 2f + canvasPositionOfIndex.X * 2f) * 0.5f + 0.5f);
            fragment.SetColor(i, vector);
        }
    }
 
    [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);
            Point gridPositionOfIndex = fragment.GetGridPositionOfIndex(i);
            Vector4 value = _backgroundColor;
            float num = (NoiseHelper.GetStaticNoise(gridPositionOfIndex.X) * 10f + time * 0.75f) % 10f + canvasPositionOfIndex.Y - 1f;
            if (num > 0f)
            {
                float amount = Math.Max(0f, 1.2f - num);
                if (num < 0.2f)
                {
                    amount = num * 5f;
                }
                value = Vector4.Lerp(value, _skullColor, amount);
            }
            float staticNoise = NoiseHelper.GetStaticNoise(canvasPositionOfIndex * 0.5f + new Vector2(12.5f, time * 0.2f));
            staticNoise = Math.Max(0f, 1f - staticNoise * staticNoise * 4f * staticNoise * (1f - canvasPositionOfIndex.Y * canvasPositionOfIndex.Y)) * canvasPositionOfIndex.Y * canvasPositionOfIndex.Y;
            staticNoise = MathHelper.Clamp(staticNoise, 0f, 1f);
            Vector4 value2 = Vector4.Lerp(_bloodDark, _bloodLight, staticNoise);
            value = Vector4.Lerp(value, value2, staticNoise);
            fragment.SetColor(i, value);
        }
    }
}