func (a *app) Run() {
// If updates start
const maxMultipleUpdates = 6
lastTime := time.Now().UnixNano()
for len(a.states) > 0 {
currentTime := time.Now().UnixNano()
if currentTime-lastTime < a.nanosecondsPerFrame {
// Avoid busy waiting and take short naps if ahead of schedule.
// XXX: Is this a good thing?
time.Sleep(10e6)
continue
}
// If things get slow, tell Update multiple frames have elapsed.
nUpdates := (currentTime - lastTime) / a.nanosecondsPerFrame
if nUpdates < 1 {
nUpdates = 1
}
if nUpdates > maxMultipleUpdates {
nUpdates = maxMultipleUpdates
}
a.TopState().Draw()
gfx.BlitX2(sdl.Frame(), sdl.Video())
sdl.Flip()
a.TopState().Update(nUpdates * a.nanosecondsPerFrame)
lastTime += nUpdates * a.nanosecondsPerFrame
}
sdl.Stop()
}
func BenchmarkTruecolorBlit(b *testing.B) {
b.StopTimer()
sdl.Run(320, 240)
defer sdl.Stop()
surf := unpaletted()
b.StartTimer()
for i := 0; i < b.N; i++ {
for y := 0; y < 30; y++ {
for x := 0; x < 40; x++ {
surf.Blit(surf.Bounds(), x*8, y*8, sdl.Frame())
}
}
sdl.Flip()
}
b.StopTimer()
}