DrippingShader.cs

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using System;
using Microsoft.Xna.Framework;
using ReLogic.Peripherals.RGB;
 
namespace Terraria.GameContent.RGB;
 
public class DrippingShader : ChromaShader
{
    private readonly Vector4 _baseColor;
 
    private readonly Vector4 _liquidColor;
 
    private readonly float _viscosity;
 
    public DrippingShader(Color baseColor, Color liquidColor, float viscosity = 1f)
    {
        _baseColor = baseColor.ToVector4();
        _liquidColor = liquidColor.ToVector4();
        _viscosity = viscosity;
    }
 
    [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(_baseColor, _liquidColor, (float)Math.Sin(time * 0.5f + canvasPositionOfIndex.X) * 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++)
        {
            fragment.GetGridPositionOfIndex(i);
            Vector2 canvasPositionOfIndex = fragment.GetCanvasPositionOfIndex(i);
            float staticNoise = NoiseHelper.GetStaticNoise(canvasPositionOfIndex * new Vector2(0.7f * _viscosity, 0.075f) + new Vector2(0f, time * -0.1f * _viscosity));
            staticNoise = Math.Max(0f, 1f - (canvasPositionOfIndex.Y * 4.5f + 0.5f) * staticNoise);
            Vector4 baseColor = _baseColor;
            baseColor = Vector4.Lerp(baseColor, _liquidColor, staticNoise);
            fragment.SetColor(i, baseColor);
        }
    }
}