; WorldAssetShader Example
; ------------------------
; Requires Extended mode.

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

camera=CreateCamera()
PositionEntity camera,0,1,-5
light=CreateLight()
RotateEntity light,45,45,0

; The crate that will receive the shader
crate=CreateCube()
PositionEntity crate,0,1,0
EntityColor crate,80,170,255

; Load the asset manifest world in the background
manifest=LoadWorldAsync("../../../samples/worlds/asset-preload.world")
While Not WorldReady(manifest)
    If WorldLoadState(manifest)=WORLD_LOAD_FAILED Then RuntimeError WorldLoadError(manifest)
    Cls
    Text 0,0,"Loading the asset manifest..."
    Flip
Wend

; The shader asset uses manual loading policy: resolving the handle
; starts preparing its packaged bytecode in the background
shader_asset=FindWorldAsset(manifest,"display-shader")
shader=0

While Not KeyDown(1)

    error$=WorldAssetError(shader_asset)

    ; Once ready, WorldAssetShader returns an ordinary shader reference
    If shader=0 And WorldAssetReady(shader_asset)
        shader=WorldAssetShader(shader_asset)
        EntityShader crate,shader
    EndIf

    TurnEntity crate,0,1,0

    ; 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,"Arrow keys: move camera   Esc: exit"
    If shader
        Text 0,20,"WorldAssetShader applied the 'World Asset Tint' shader to the crate"
    ElseIf error<>""
        ; The packaged release ships the shader bytecode beside the manifest
        Text 0,20,"The shader asset could not be prepared:"
        Text 0,40,Mid(error,1,70)
        Text 0,60,Mid(error,71,70)
    Else
        Text 0,20,"Preparing the shader asset..."
    EndIf

    Flip

Wend

FreeWorld manifest
If shader Then FreeShader shader
End