; ShaderColor Example
; -------------------
; Requires Extended mode.

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

camera=CreateCamera()
PositionEntity camera,0,0,-5

light=CreateLight()
RotateEntity light,35,-30,0

sphere=CreateSphere(32)

; The shader declares a colour parameter named Tint
shader=LoadShader("assets/help_surface.b3shader")
EntityShader sphere,shader

angle#=0
paused=False

While Not KeyDown(1)

    ; Press Space to pause the colour cycle
    If KeyHit(57) Then paused=Not paused
    If Not paused Then angle=angle+1

    ; Feed a cycling colour into the shader's Tint parameter
    red=128+Sin(angle)*127
    green=128+Sin(angle+120)*127
    blue=128+Sin(angle+240)*127
    ShaderColor shader,"Tint",red,green,blue

    TurnEntity sphere,0.2,0.4,0

    ; 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,"Space: pause colour cycle   Arrow keys: move camera   Esc: exit"
    Text 0,20,"ShaderColor shader,"+Chr$(34)+"Tint"+Chr$(34)+","+red+","+green+","+blue

    Flip

Wend

FreeShader shader
End