cli.go

// Start starts rendering based on CLI parameters
func (c Cli) Start() {
	out := flag.String("out", "render.png", "Output png filename.")
	concurrency := flag.Int("frames", runtime.NumCPU(), "Number of frames to combine.")
	samples := flag.Float64("samples", math.Inf(1), "Average per pixel samples to take.")
	heat := flag.String("heat", "", "Heatmap png filename.")
	flag.Parse()

	running := make(chan struct{})
	ch := make(chan os.Signal, 2)
	signal.Notify(ch, os.Interrupt, syscall.SIGTERM)
	go func() { <-ch; close(running) }()

	fmt.Printf("Rendering (concurrency: %v, per pixel sample cutoff: %v)\n", *concurrency, *samples)
	var results chan []float64
	for i := 0; i < *concurrency; i++ {
		go c.sampler.Worker(i, running, results) // TODO: instantiate a worker ala https://play.golang.org/p/Sfx1JL_6K2
	}
	for i := 0; i < *concurrency; i++ {
		result := <-results
		// TODO: add results to total
	}
	c.renderer.Write(c.sampler.Values(), *out)
	if len(*heat) > 0 {
		c.renderer.Write(c.sampler.Counts(), *heat)
	}
	fmt.Printf("\n -> %v\n", out)
}