refactor main loop

main.go

@@ -17,6 +17,42 @@ import (
 	"unsafe"
 )
 
+const bufSize uint = 2048
+
+func render(window *sdl.Window, handle C.projectm_handle) (bool, error) {
+	var audioData [bufSize]int16
+
+	err := binary.Read(os.Stdin, binary.LittleEndian, &audioData)
+	if err == io.ErrUnexpectedEOF {
+		return false, nil
+	} else if err != nil {
+		return true, err
+	}
+
+	C.projectm_pcm_add_int16(handle, (*C.int16_t)(&audioData[0]), C.uint(bufSize), C.PROJECTM_STEREO)
+
+	C.projectm_opengl_render_frame(handle)
+	window.GLSwap()
+
+	return true, nil
+}
+
+func handleEvent(event sdl.Event, handle C.projectm_handle) bool {
+	switch event.(type) {
+	case *sdl.QuitEvent:
+		return false
+	case *sdl.WindowEvent:
+		event := event.(*sdl.WindowEvent)
+		switch event.Event {
+		case sdl.WINDOWEVENT_RESIZED:
+			w, h := event.Data1, event.Data2
+			C.projectm_set_window_size(handle, C.ulong(w), C.ulong(h))
+		}
+	}
+
+	return true
+}
+
 func main() {
 	windowWidth := 800
 	windowHeight := 600
@@ -51,38 +87,22 @@ func main() {
 	defer C.free(unsafe.Pointer(preset))
 	C.projectm_load_preset_file(handle, preset, false)
 
-	const bufSize uint = 2048
-
 	running := true
 	for running {
 		for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
-			switch event.(type) {
+			running = handleEvent(event, handle)
-			case *sdl.QuitEvent:
+			if !running {
-				running = false
 				break
-			case *sdl.WindowEvent:
-				event := event.(*sdl.WindowEvent)
-				switch event.Event {
-				case sdl.WINDOWEVENT_RESIZED:
-					w, h := event.Data1, event.Data2
-					C.projectm_set_window_size(handle, C.ulong(w), C.ulong(h))
-				}
 			}
 		}
 
-		var audioData [bufSize]int16
+		if !running {
-
-		err = binary.Read(os.Stdin, binary.LittleEndian, &audioData)
-		if err == io.ErrUnexpectedEOF {
-			running = false
 			break
-		} else if err != nil {
-			panic(err)
 		}
 
-		C.projectm_pcm_add_int16(handle, (*C.int16_t)(&audioData[0]), C.uint(bufSize), C.PROJECTM_STEREO)
+		running, err = render(window, handle)
-
+		if err != nil {
-		C.projectm_opengl_render_frame(handle)
+			panic(err)
-		window.GLSwap()
+		}
 	}
 }