; CopyShader Example
; ------------------
; Requires Extended mode.

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

camera=CreateCamera()
PositionEntity camera,0,0,-6

light=CreateLight()
RotateEntity light,30,-30,0

; Copies share compiled code but keep independent parameter values
original=LoadShader("assets/help_surface.b3shader")
copy=CopyShader(original)
ShaderColor original,"Tint",255,120,20

left=CreateSphere(24)
PositionEntity left,-1.3,0,0
EntityShader left,original

right=CreateSphere(24)
PositionEntity right,1.3,0,0
EntityShader right,copy

angle#=0

While Not KeyDown(1)

    ; Recolour only the copy - the original keeps its orange tint
    angle=angle+1
    ShaderColor copy,"Tint",128+Sin(angle)*127,120,255

    TurnEntity left,0,0.5,0
    TurnEntity right,0,-0.5,0

    ; 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

    Color 255,255,255
    Text 0,0,"Arrow keys: move camera   Esc: exit"
    Text 0,20,"Left: original shader   Right: copy=CopyShader(original)"
    Text 0,40,"Only the copy's Tint changes each frame"

    Flip

Wend

FreeShader original
FreeShader copy
End