separate out running chip8 to goroutine

cmd/web/main.go

@@ -24,6 +24,7 @@ var graphicsLock sync.Mutex
 var keysLock sync.Mutex
 var window js.Value
 var keys [16]byte
+var gameRunning = true
 
 var keyMap = map[int]int{
 	88: 0,  // x
@@ -59,6 +60,48 @@ func keyEventHandle(event js.Value) {
 	}
 }
 
+func cpuCycle(cpu *chip8.Chip8, c chan int, i int) {
+	cpu.PerformCycle()
+	if cpu.DrawIsNeeded() {
+		drawNeeded = true
+		graphicsLock.Lock()
+		drawBuf = cpu.GetGraphicsBuffer()
+		graphicsLock.Unlock()
+		keysLock.Lock()
+		cpu.UpdateKeys(keys)
+		keysLock.Unlock()
+	}
+	if i > 7 {
+		cpu.TickTimers()
+		//println("here!")
+	}
+	c <- 1
+}
+
+func timeCycle(c chan int) {
+	time.Sleep(2000 * time.Microsecond)
+	c <- 0
+}
+
+func runGame(game []byte) {
+	cpu := chip8.NewCHIP8(game)
+	i := 0
+	for gameRunning {
+		c := make(chan int)
+		go timeCycle(c)
+		i ++ 
+		go cpuCycle(cpu, c, i)
+		if i > 7 {
+			i = 0
+		}
+
+		x, y := <-c, <-c
+		if x == 0 {
+			println("CPU RUNNING SLOW")
+			println(x, y)
+		}
+	}
+}
 func main() {
 	println("CHIP8 IS HERE!")
 	window = js.Global()
@@ -79,36 +122,11 @@ func main() {
 	height = float64(cvs.Height())
 	width = float64(cvs.Width())
 
-	cpu := chip8.NewCHIP8(getSpaceInvaders())
-
 	cvs.Start(60, Render)
-	i := 0
-	for {
-		c := make(chan int)
-		go timeCycle(c)
-		cpu.PerformCycle()
-		if cpu.DrawIsNeeded() {
-			drawNeeded = true
-			graphicsLock.Lock()
-			drawBuf = cpu.GetGraphicsBuffer()
-			graphicsLock.Unlock()
-			keysLock.Lock()
-			cpu.UpdateKeys(keys)
-			keysLock.Unlock()
-		}
-		i++
-		if i > 7 {
-			cpu.TickTimers()
-			i = 0
-			//println("here!")
-		}
-		<-c
-	}
-}
 
-func timeCycle(c chan int) {
-	time.Sleep(2000 * time.Microsecond)
-	c <- 0
+	go runGame(getPong())
+	never_returns := make(chan int)
+	<-never_returns
 }
 
 func Render(gc *draw2dimg.GraphicContext) bool {