add profiling support and window geom options to force geometry

main.go

@@ -4,35 +4,77 @@ import (
 	"fmt"
 	"log"
 	"os"
+	"runtime/pprof"
+	"time"
+
+	_ "net/http/pprof"
 
 	"github.com/hajimehoshi/ebiten/v2"
 )
 
 func main() {
-	config := ParseCommandline()
+	config, err := ParseCommandline()
+	if err != nil {
+		log.Fatal(err)
+	}
 
 	if config.ShowVersion {
 		fmt.Printf("This is golsky version %s\n", VERSION)
 		os.Exit(0)
 	}
 
-	// grid := [][]int64{
-	// 	{0, 1, 1},
-	// 	{0, 1, 0},
-	// 	{1, 1, 0},
-	// }
-
-	// err := rle.StoreGridToRLE(grid, "test.rle", "B3/S23", 3, 3)
-	// if err != nil {
-	// 	panic(err)
-	// }
-
-	// os.Exit(0)
-
 	game := NewGame(config, Play)
 
+	if config.ProfileFile != "" {
+		// enable cpu profiling and use fake game loop
+		fd, err := os.Create(config.ProfileFile)
+		if err != nil {
+			log.Fatal(err)
+		}
+		defer fd.Close()
+
+		pprof.StartCPUProfile(fd)
+		defer pprof.StopCPUProfile()
+
+		Ebitfake(game)
+
+		pprof.StopCPUProfile()
+		fd.Close()
+
+		os.Exit(0)
+	}
+
 	// main loop
 	if err := ebiten.RunGame(game); err != nil {
 		log.Fatal(err)
 	}
 }
+
+// fake game  loop, required to be  able to profile the  program using
+// pprof. Otherwise any kind of program  exit leads to an empty profile
+// file.
+func Ebitfake(game *Game) {
+	screen := ebiten.NewImage(game.ScreenWidth, game.ScreenHeight)
+
+	var loops int64
+
+	for {
+		err := game.Update()
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		if game.Config.ProfileDraw {
+			game.Draw(screen)
+		}
+
+		fmt.Print(".")
+		time.Sleep(16 * time.Millisecond) // around 60 TPS
+
+		if loops >= game.Config.ProfileMaxLoops {
+			break
+		}
+
+		loops++
+	}
+}