func NewFramerate() *FPSmanager {
return &FPSmanager{
framecount: 0,
rate: FPS_DEFAULT,
rateticks: (1000.0 / float32(FPS_DEFAULT)),
lastticks: sdl.GetTicks(),
}
}
func (manager *FPSmanager) FramerateDelay() {
var current_ticks, target_ticks, the_delay uint32
// next frame
manager.framecount++
// get/calc ticks
current_ticks = sdl.GetTicks()
target_ticks = manager.lastticks + uint32(float32(manager.framecount)*manager.rateticks)
if current_ticks <= target_ticks {
the_delay = target_ticks - current_ticks
sdl.Delay(the_delay)
} else {
manager.framecount = 0
manager.lastticks = sdl.GetTicks()
}
}
func draw() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.PushMatrix()
gl.Rotated(view_rotx, 1.0, 0.0, 0.0)
gl.Rotated(view_roty, 0.0, 1.0, 0.0)
gl.Rotated(view_rotz, 0.0, 0.0, 1.0)
gl.PushMatrix()
gl.Translated(-3.0, -2.0, 0.0)
gl.Rotated(angle, 0.0, 0.0, 1.0)
gl.CallList(gear1)
gl.PopMatrix()
gl.PushMatrix()
gl.Translated(3.1, -2.0, 0.0)
gl.Rotated(-2.0*angle-9.0, 0.0, 0.0, 1.0)
gl.CallList(gear2)
gl.PopMatrix()
gl.PushMatrix()
gl.Translated(-3.1, 4.2, 0.0)
gl.Rotated(-2.0*angle-25.0, 0.0, 0.0, 1.0)
gl.CallList(gear3)
gl.PopMatrix()
gl.PopMatrix()
sdl.GL_SwapBuffers()
Frames++
{
t := sdl.GetTicks()
if t-T0 >= 5000 {
seconds := (t - T0) / 1000.0
fps := Frames / seconds
print(Frames, " frames in ", seconds, " seconds = ", fps, " FPS\n")
T0 = t
Frames = 0
}
}
}