EmpressBladeDrawer.cs

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using Microsoft.Xna.Framework;
using Terraria.Graphics.Shaders;
 
namespace Terraria.Graphics;
 
public struct EmpressBladeDrawer
{
    public const int TotalIllusions = 1;
 
    public const int FramesPerImportantTrail = 60;
 
    private static VertexStrip _vertexStrip = new VertexStrip();
 
    public Color ColorStart;
 
    public Color ColorEnd;
 
    public void Draw(Projectile proj)
    {
        _ = proj.ai[1];
        MiscShaderData miscShaderData = GameShaders.Misc["EmpressBlade"];
        int num = 1;
        int num2 = 0;
        int num3 = 0;
        float w = 0.6f;
        miscShaderData.UseShaderSpecificData(new Vector4(num, num2, num3, w));
        miscShaderData.Apply();
        _vertexStrip.PrepareStrip(proj.oldPos, proj.oldRot, StripColors, StripWidth, -Main.screenPosition + proj.Size / 2f, proj.oldPos.Length, includeBacksides: true);
        _vertexStrip.DrawTrail();
        Main.pixelShader.CurrentTechnique.Passes[0].Apply();
    }
 
    private Color StripColors(float progressOnStrip)
    {
        Color result = Color.Lerp(ColorStart, ColorEnd, Utils.GetLerpValue(0f, 0.7f, progressOnStrip, clamped: true)) * (1f - Utils.GetLerpValue(0f, 0.98f, progressOnStrip, clamped: true));
        result.A /= 2;
        return result;
    }
 
    private float StripWidth(float progressOnStrip)
    {
        return 36f;
    }
}