FinalFractalHelper.cs

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using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using Microsoft.Xna.Framework;
using Terraria.Graphics.Shaders;
 
namespace Terraria.Graphics;
 
[StructLayout(LayoutKind.Sequential, Size = 1)]
public struct FinalFractalHelper
{
    public delegate void SpawnDustMethod(Vector2 centerPosition, float rotation, Vector2 velocity);
 
    public struct FinalFractalProfile
    {
        public float trailWidth;
 
        public Color trailColor;
 
        public SpawnDustMethod dustMethod;
 
        public VertexStrip.StripColorFunction colorMethod;
 
        public VertexStrip.StripHalfWidthFunction widthMethod;
 
        public FinalFractalProfile(float fullBladeLength, Color color)
        {
            trailWidth = fullBladeLength / 2f;
            trailColor = color;
            widthMethod = null;
            colorMethod = null;
            dustMethod = null;
            widthMethod = StripWidth;
            colorMethod = StripColors;
            dustMethod = StripDust;
        }
 
        private void StripDust(Vector2 centerPosition, float rotation, Vector2 velocity)
        {
            if (Main.rand.Next(9) == 0)
            {
                int num = Main.rand.Next(1, 4);
                for (int i = 0; i < num; i++)
                {
                    Dust dust = Dust.NewDustPerfect(centerPosition, 278, null, 100, Color.Lerp(trailColor, Color.White, Main.rand.NextFloat() * 0.3f));
                    dust.scale = 0.4f;
                    dust.fadeIn = 0.4f + Main.rand.NextFloat() * 0.3f;
                    dust.noGravity = true;
                    dust.velocity += rotation.ToRotationVector2() * (3f + Main.rand.NextFloat() * 4f);
                }
            }
        }
 
        private Color StripColors(float progressOnStrip)
        {
            Color result = trailColor * (1f - Utils.GetLerpValue(0f, 0.98f, progressOnStrip));
            result.A /= 2;
            return result;
        }
 
        private float StripWidth(float progressOnStrip)
        {
            return trailWidth;
        }
    }
 
    public const int TotalIllusions = 4;
 
    public const int FramesPerImportantTrail = 15;
 
    private static VertexStrip _vertexStrip = new VertexStrip();
 
    private static Dictionary<int, FinalFractalProfile> _fractalProfiles = new Dictionary<int, FinalFractalProfile>
    {
        {
            65,
            new FinalFractalProfile(48f, new Color(236, 62, 192))
        },
        {
            1123,
            new FinalFractalProfile(48f, Main.OurFavoriteColor)
        },
        {
            46,
            new FinalFractalProfile(48f, new Color(122, 66, 191))
        },
        {
            121,
            new FinalFractalProfile(76f, new Color(254, 158, 35))
        },
        {
            190,
            new FinalFractalProfile(70f, new Color(107, 203, 0))
        },
        {
            368,
            new FinalFractalProfile(70f, new Color(236, 200, 19))
        },
        {
            674,
            new FinalFractalProfile(70f, new Color(236, 200, 19))
        },
        {
            273,
            new FinalFractalProfile(70f, new Color(179, 54, 201))
        },
        {
            675,
            new FinalFractalProfile(70f, new Color(179, 54, 201))
        },
        {
            2880,
            new FinalFractalProfile(70f, new Color(84, 234, 245))
        },
        {
            989,
            new FinalFractalProfile(48f, new Color(91, 158, 232))
        },
        {
            1826,
            new FinalFractalProfile(76f, new Color(252, 95, 4))
        },
        {
            3063,
            new FinalFractalProfile(76f, new Color(254, 194, 250))
        },
        {
            3065,
            new FinalFractalProfile(70f, new Color(237, 63, 133))
        },
        {
            757,
            new FinalFractalProfile(70f, new Color(80, 222, 122))
        },
        {
            155,
            new FinalFractalProfile(70f, new Color(56, 78, 210))
        },
        {
            795,
            new FinalFractalProfile(70f, new Color(237, 28, 36))
        },
        {
            3018,
            new FinalFractalProfile(80f, new Color(143, 215, 29))
        },
        {
            4144,
            new FinalFractalProfile(45f, new Color(178, 255, 180))
        },
        {
            3507,
            new FinalFractalProfile(45f, new Color(235, 166, 135))
        },
        {
            4956,
            new FinalFractalProfile(86f, new Color(178, 255, 180))
        }
    };
 
    private static FinalFractalProfile _defaultProfile = new FinalFractalProfile(50f, Color.White);
 
    public static int GetRandomProfileIndex()
    {
        List<int> list = _fractalProfiles.Keys.ToList();
        int index = Main.rand.Next(list.Count);
        if (list[index] == 4956)
        {
            list.RemoveAt(index);
            index = Main.rand.Next(list.Count);
        }
        return list[index];
    }
 
    public void Draw(Projectile proj)
    {
        FinalFractalProfile finalFractalProfile = GetFinalFractalProfile((int)proj.ai[1]);
        MiscShaderData miscShaderData = GameShaders.Misc["FinalFractal"];
        int num = 4;
        int num2 = 0;
        int num3 = 0;
        int num4 = 4;
        miscShaderData.UseShaderSpecificData(new Vector4(num, num2, num3, num4));
        miscShaderData.UseImage0("Images/Extra_" + (short)201);
        miscShaderData.UseImage1("Images/Extra_" + (short)193);
        miscShaderData.Apply();
        _vertexStrip.PrepareStrip(proj.oldPos, proj.oldRot, finalFractalProfile.colorMethod, finalFractalProfile.widthMethod, -Main.screenPosition + proj.Size / 2f, proj.oldPos.Length, includeBacksides: true);
        _vertexStrip.DrawTrail();
        Main.pixelShader.CurrentTechnique.Passes[0].Apply();
    }
 
    public static FinalFractalProfile GetFinalFractalProfile(int usedSwordId)
    {
        if (!_fractalProfiles.TryGetValue(usedSwordId, out var value))
        {
            return _defaultProfile;
        }
        return value;
    }
 
    private Color StripColors(float progressOnStrip)
    {
        Color result = Color.Lerp(Color.White, Color.Violet, Utils.GetLerpValue(0f, 0.7f, progressOnStrip, clamped: true)) * (1f - Utils.GetLerpValue(0f, 0.98f, progressOnStrip));
        result.A /= 2;
        return result;
    }
 
    private float StripWidth(float progressOnStrip)
    {
        return 50f;
    }
}