SkyShader.cs

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using System;
using Microsoft.Xna.Framework;
using ReLogic.Peripherals.RGB;
 
namespace Terraria.GameContent.RGB;
 
public class SkyShader : ChromaShader
{
    private readonly Vector4 _baseSkyColor;
 
    private readonly Vector4 _baseSpaceColor;
 
    private Vector4 _processedSkyColor;
 
    private Vector4 _processedCloudColor;
 
    private float _backgroundTransition;
 
    private float _starVisibility;
 
    public SkyShader(Color skyColor, Color spaceColor)
    {
        _baseSkyColor = skyColor.ToVector4();
        _baseSpaceColor = spaceColor.ToVector4();
    }
 
    public override void Update(float elapsedTime)
    {
        float num = Main.player[Main.myPlayer].position.Y / 16f;
        _backgroundTransition = MathHelper.Clamp((num - (float)Main.worldSurface * 0.25f) / ((float)Main.worldSurface * 0.1f), 0f, 1f);
        _processedSkyColor = _baseSkyColor * (Main.ColorOfTheSkies.ToVector4() * 0.75f + Vector4.One * 0.25f);
        _processedCloudColor = Main.ColorOfTheSkies.ToVector4() * 0.75f + Vector4.One * 0.25f;
        if (Main.dayTime)
        {
            float num2 = (float)(Main.time / 54000.0);
            if (num2 < 0.25f)
            {
                _starVisibility = 1f - num2 / 0.25f;
            }
            else if (num2 > 0.75f)
            {
                _starVisibility = (num2 - 0.75f) / 0.25f;
            }
            else
            {
                _starVisibility = 0f;
            }
        }
        else
        {
            _starVisibility = 1f;
        }
        _starVisibility = Math.Max(1f - _backgroundTransition, _starVisibility);
    }
 
    [RgbProcessor(/*Could not decode attribute arguments.*/)]
    private void ProcessAnyDetail(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);
            float dynamicNoise = NoiseHelper.GetDynamicNoise(canvasPositionOfIndex * new Vector2(0.1f, 0.5f) + new Vector2(time * 0.05f, 0f), time / 20f);
            dynamicNoise = (float)Math.Sqrt(Math.Max(0f, 1f - 2f * dynamicNoise));
            Vector4 value = Vector4.Lerp(_processedSkyColor, _processedCloudColor, dynamicNoise);
            value = Vector4.Lerp(_baseSpaceColor, value, _backgroundTransition);
            float dynamicNoise2 = NoiseHelper.GetDynamicNoise(gridPositionOfIndex.X, gridPositionOfIndex.Y, time / 60f);
            dynamicNoise2 = Math.Max(0f, 1f - dynamicNoise2 * 20f);
            value = Vector4.Lerp(value, Vector4.One, dynamicNoise2 * 0.98f * _starVisibility);
            fragment.SetColor(i, value);
        }
    }
}