CPUMandelbrot.cs

        [Command("mandelbrot")]
        public async Task Mandelbrot()
        {
            var maxToRun = 40;
            var frames = 3600;
            var path = @"C:\RenderingTemp\";
            var colors = Enumerable.Range(0, maxToRun + 1).Select(i => Paint.Lerp(Paint.White, Paint.Black, i / (float)maxToRun)).ToArray();
            if (Directory.Exists(path)) { try { Directory.Delete(path, true); } catch { } }
            Directory.CreateDirectory(path);

            float Mandelbrot(float x, float y, float max, float pow)
            {
                var c = new Complex(x, y);
                var z = Complex.Zero;
                var i = 0;
                while (Complex.Abs(z) <= 2 && i < max) { z = Complex.Pow(z, pow) + c; i++; }
                if (i == max) { return max; }
                return (float)(i + 1 - Math.Log(Math.Log(Complex.Abs(z))) / Math.Log(2));
            }

            Sprite Render(int j)
            {
                var s = new Sprite(4000, 4000);
                var pixels = new byte[s.Width * s.Height * 4];
                for (var q = 0; q < s.Width * s.Height; q++)
                {
                    (var x, var y) = (q % s.Width, q / s.Width);
                    var x2 = PMath.Map(x, 0, s.Width, -2.25f, 0.75f);
                    var y2 = PMath.Map(y, 0, s.Height, -1.5f, 1.5f);
                    var i = Mandelbrot(x2, y2, maxToRun, PMath.Map(j / (float)frames, 0, 1, 0, 4));
                    i = i == 0 ? 0.000001f : i;
                    var c = float.IsNaN(i) ? Paint.Red : Paint.LerpMultiple(colors, i / (float)maxToRun);
                    var pos = q * 4;
                    pixels[pos] = (byte)c.B;
                    pixels[pos + 1] = (byte)c.G;
                    pixels[pos + 2] = (byte)c.R;
                    pixels[pos + 3] = (byte)255;
                }
                s.Art.SetPixels(pixels);
                return s;
            }
            await ReplyAsync($"Rendering...");
            var time = DateTime.Now;
            var totalFinished = 0;
            Parallel.For(0, frames, new ParallelOptions() { MaxDegreeOfParallelism = 3 }, i =>
            {
                var s = Render(i);
                s.Save($@"{path}{i:000000}.png");
                s.Dispose();
                if (time.Add(new TimeSpan(0, 1, 0)) < DateTime.Now)
                {
                    time = DateTime.Now;
                    ReplyAsync($"🦥 `{((float)totalFinished / (float)frames) * 100f}%`, `{totalFinished} / {frames}`");
                }
                totalFinished++;
            });
            await ReplyAsync("Render complete, compiling into video...");
            await Extensions.FFMPEG(" -framerate 60 -i %06d.png -c:v libx264 -r 60 output.mp4", path);
            await ReplyAsync($"{Context.User.Mention}, uploading...");
            await Context.Channel.SendFileAsync($"{path}output.mp4");
        }