; UpdateAsyncLoads Example
; ------------------------
; Requires Extended mode.

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

; A simple loading screen lives in the default world
camera=CreateCamera()
PositionEntity camera,0,0,-5
light=CreateLight()
RotateEntity light,45,45,0
spinner=CreateCube()
EntityColor spinner,80,170,255

; Start loading the castle world in the background
castle_world=LoadWorldAsync("../../../samples/worlds/castle/castle.world")

While Not WorldReady(castle_world)
    If WorldLoadState(castle_world)=WORLD_LOAD_FAILED Then RuntimeError WorldLoadError(castle_world)

    ; Service async loading with up to 4 ms of main-thread finalization
    ; this frame. Flip also pumps automatically, so this call matters
    ; most in loops without Flip, FlipCanvas, Delay or WaitTimer
    ; (-1 uses the AsyncLoadBudget value, 0 only drains notifications)
    UpdateAsyncLoads 4

    TurnEntity spinner,0.5,1,0.25
    RenderWorld
    Text 0,0,"Loading the castle world..."
    Text 0,20,"UpdateAsyncLoads 4 grants extra finalization time each frame"
    Text 0,40,"Progress: "+(WorldLoadProgress(castle_world)/10.0)+"%"
    Flip
Wend

; The world is ready: select it and use its authored camera
SetWorld castle_world
castle_cam=FindWorldEntity(castle_world,"camera-main")
PointEntity castle_cam,FindWorldEntity(castle_world,"castle")

; A spinning beacon shows the loaded world animating
beacon=CreateCube()
ScaleEntity beacon,4,4,4
PositionEntity beacon,0,45,0
EntityColor beacon,255,200,80

While Not KeyDown(1)

    TurnEntity beacon,0,1,0

    ; Arrow keys move the camera (bigger steps suit the castle's scale)
    If KeyDown(200) Then MoveEntity castle_cam,0,0,1
    If KeyDown(208) Then MoveEntity castle_cam,0,0,-1
    If KeyDown(203) Then TurnEntity castle_cam,0,1,0
    If KeyDown(205) Then TurnEntity castle_cam,0,-1,0

    RenderWorld

    Text 0,0,"Arrow keys: move camera   Esc: exit"
    Text 0,20,"The castle finished loading with help from UpdateAsyncLoads"

    Flip

Wend

FreeWorld castle_world
End