shithub: mc

ref: d861ac1aa2d18ba89b389785ea23b9e72e1edaa1
dir: /bench/mandelbrot.myr/

use std
use bio
use testr

const Bailout : flt64 = 16.0
const Maxiter = 1000

const main = {
	testr.bench([
		[.name="mandelbrot", .fn=writemandel]
	][:])
}


const writemandel = {ctx
	var x : flt64, y : flt64, i
	var f

	f = bio.mkfile(1, bio.Wr)
	for i = 0; i < 10; i++
		for y = -39.0; y < 39.0; y = y + 1.0
			for x = -39.0; x < 39.0; x = x + 1.0
				if mandelbrot(x/40.0, y/40.0) == 0
					bio.write(f, "*")
				else
					bio.write(f, " ")
				;;
			;;
			bio.write(f, "\n")
		;;
	;;
	bio.write(f, "\n")
	/* we still use this fd to log our test output... */
	bio.flush(f)
}

const mandelbrot = {x, y
	var cr, ci, zr, zi
	var tmp, zr2, zi2
	var i : int

	cr = y - 0.5
	ci = x
	zr = 0.0
	zi = 0.0

	i = 0

	while true
		i++
		tmp  = zr * zi
		zr2 = zr * zr
		zi2 = zi * zi
		zr = zr2 - zi2 + cr
		zi = tmp + tmp + ci
		if zi2 + zr2 > Bailout
			-> i
		;;
		if i > Maxiter
			-> 0
		;;
	;;
	-> 0
}