GemCaveShader.cs

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using System;
using Microsoft.Xna.Framework;
using ReLogic.Peripherals.RGB;
 
namespace Terraria.GameContent.RGB;
 
public class GemCaveShader : ChromaShader
{
    private readonly Vector4 _primaryColor;
 
    private readonly Vector4 _secondaryColor;
 
    private readonly Vector4[] _gemColors;
 
    public float CycleTime;
 
    public float ColorRarity;
 
    public float TimeRate;
 
    public GemCaveShader(Color primaryColor, Color secondaryColor, Vector4[] gemColors)
    {
        _primaryColor = primaryColor.ToVector4();
        _secondaryColor = secondaryColor.ToVector4();
        _gemColors = gemColors;
    }
 
    [RgbProcessor(/*Could not decode attribute arguments.*/)]
    private void ProcessHighDetail(RgbDevice device, Fragment fragment, EffectDetailLevel quality, float time)
    {
        time *= TimeRate;
        float num = time % 1f;
        bool num2 = time % 2f > 1f;
        Vector4 vector = (num2 ? _secondaryColor : _primaryColor);
        Vector4 value = (num2 ? _primaryColor : _secondaryColor);
        num *= 1.2f;
        for (int i = 0; i < fragment.Count; i++)
        {
            Vector2 canvasPositionOfIndex = fragment.GetCanvasPositionOfIndex(i);
            Point gridPositionOfIndex = fragment.GetGridPositionOfIndex(i);
            float staticNoise = NoiseHelper.GetStaticNoise(canvasPositionOfIndex * 0.5f + new Vector2(0f, time * 0.5f));
            Vector4 value2 = vector;
            staticNoise += num;
            if (staticNoise > 0.999f)
            {
                float amount = MathHelper.Clamp((staticNoise - 0.999f) / 0.2f, 0f, 1f);
                value2 = Vector4.Lerp(value2, value, amount);
            }
            float dynamicNoise = NoiseHelper.GetDynamicNoise(gridPositionOfIndex.X, gridPositionOfIndex.Y, time / CycleTime);
            dynamicNoise = Math.Max(0f, 1f - dynamicNoise * ColorRarity);
            value2 = Vector4.Lerp(value2, _gemColors[((gridPositionOfIndex.Y * 47 + gridPositionOfIndex.X) % _gemColors.Length + _gemColors.Length) % _gemColors.Length], dynamicNoise);
            fragment.SetColor(i, value2);
            fragment.SetColor(i, value2);
        }
    }
}