From 80c666b2665d1698484f04373c418608b5420e33 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@hajimehoshi.com>
Date: Tue, 18 Jun 2013 10:45:44 +0900
Subject: [PATCH] Refactoring

---
 examples/glut/main.go | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/examples/glut/main.go b/examples/glut/main.go
index fb4b795cd..5fd6ba7dc 100644
--- a/examples/glut/main.go
+++ b/examples/glut/main.go
@@ -76,22 +76,24 @@ func main() {
 	game := &DemoGame{}
 	device = graphics.NewDevice(screenWidth, screenHeight, screenScale,
 		func(g *graphics.GraphicsContext, offscreen *graphics.Texture) {
-			ch<- true
-			game.Draw(g, offscreen)
 			<-ch
+			game.Draw(g, offscreen)
+			ch<- true
 		})
 
 	go func() {
 		const frameTime = time.Second / 60
 		lastTime := time.Now()
 		for {
-			ch<- true
-			game.Update()
 			<-ch
-			time.Sleep(frameTime - time.Since(lastTime))
-			lastTime = time.Now()
+			game.Update()
+			ch<- true
+			now := time.Now()
+			time.Sleep(frameTime - now.Sub(lastTime))
+			lastTime = now
 		}
 	}()
+	ch<- true
 
 	C.glutMainLoop()
 }