; VSync Example
; -------------
; Requires Extended mode.

Graphics3D 640,480,0,2
SetBuffer BackBuffer()

camera=CreateCamera()
PositionEntity camera,0,2,-7
RotateEntity camera,10,0,0

light=CreateLight()
RotateEntity light,45,45,0

; A fast-spinning striped drum; tearing shows on it when VSync is off
drum=CreateCylinder()
ScaleEntity drum,1.5,2,1.5
PositionEntity drum,0,2,2
EntityColor drum,240,200,60

post=CreateCube()
ScaleEntity post,0.3,2,0.3
PositionEntity post,0,0,2
EntityColor post,120,160,220

sync=1
frames=0
fps=0
timer=MilliSecs()

While Not KeyDown(1)

    ; Press Space to toggle vertical synchronisation
    If KeyHit(57) Then sync=1-sync

    ; Synchronise Flip with the display, or present immediately
    VSync sync

    ; Count real frames per second
    frames=frames+1
    If MilliSecs()-timer>=1000 Then
        fps=frames
        frames=0
        timer=MilliSecs()
    EndIf

    TurnEntity drum,0,7,0

    ; Arrow keys move the camera
    If KeyDown(200) Then MoveEntity camera,0,0,0.1
    If KeyDown(208) Then MoveEntity camera,0,0,-0.1
    If KeyDown(203) Then TurnEntity camera,0,1,0
    If KeyDown(205) Then TurnEntity camera,0,-1,0

    RenderWorld

    Text 0,0,"Space: toggle VSync   Arrow keys: move camera   Esc: exit"
    If sync
        Text 0,20,"VSync True   (Flip waits for the display - no tearing)"
    Else
        Text 0,20,"VSync False   (Flip presents immediately)"
    EndIf
    Text 0,40,"Measured: "+fps+" fps"

    Flip

Wend

End