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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
// Adapted from mandelbrot C# .NET Core #4 program
// http://benchmarksgame.alioth.debian.org/u64q/program.php?test=mandelbrot&lang=csharpcore&id=4
// Best-scoring C# .NET Core version as of 2017-09-01
/* The Computer Language Benchmarks Game
http://benchmarksgame.alioth.debian.org/
started with Java #2 program (Krause/Whipkey/Bennet/AhnTran/Enotus/Stalcup)
adapted for C# by Jan de Vaan
simplified and optimised to use TPL by Anthony Lloyd
*/
using System;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.CompilerServices;
namespace BenchmarksGame
{
public class MandelBrot
{
[MethodImpl(MethodImplOptions.AggressiveInlining)]
static byte getByte(double[] Crb, double Ciby, int x, int y)
{
int res = 0;
for (int i = 0; i < 8; i += 2)
{
double Crbx = Crb[x + i], Crbx1 = Crb[x + i + 1];
double Zr1 = Crbx, Zr2 = Crbx1;
double Zi1 = Ciby, Zi2 = Ciby;
int b = 0;
int j = 49;
do
{
double nZr1 = Zr1 * Zr1 - Zi1 * Zi1 + Crbx;
Zi1 = Zr1 * Zi1 + Zr1 * Zi1 + Ciby;
Zr1 = nZr1;
double nZr2 = Zr2 * Zr2 - Zi2 * Zi2 + Crbx1;
Zi2 = Zr2 * Zi2 + Zr2 * Zi2 + Ciby;
Zr2 = nZr2;
if (Zr1 * Zr1 + Zi1 * Zi1 > 4) { b |= 2; if (b == 3) break; }
if (Zr2 * Zr2 + Zi2 * Zi2 > 4) { b |= 1; if (b == 3) break; }
} while (--j > 0);
res = (res << 2) + b;
}
return (byte)(res ^ -1);
}
public static void Main(String[] args)
{
var n = args.Length > 0 ? Int32.Parse(args[0]) : 200;
double invN = 2.0 / n;
var Crb = new double[n + 7];
for (int i = 0; i < n; i++) { Crb[i] = i * invN - 1.5; }
int lineLen = (n - 1) / 8 + 1;
var data = new byte[n * lineLen];
Parallel.For(0, n, y =>
{
var Ciby = y * invN - 1.0;
var offset = y * lineLen;
for (int x = 0; x < lineLen; x++)
data[offset + x] = getByte(Crb, Ciby, x * 8, y);
});
Console.Out.WriteLine("P4\n{0} {0}", n);
Console.OpenStandardOutput().Write(data, 0, data.Length);
}
}
}
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