; ShaderTexture 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

; Draw two textures to swap between: a checker and stripes
checker=CreateTexture(64,64)
SetBuffer TextureBuffer(checker)
Color 255,255,255
Rect 0,0,32,32,True
Rect 32,32,32,32,True
Color 30,80,180
Rect 32,0,32,32,True
Rect 0,32,32,32,True
SetBuffer BackBuffer()

stripes=CreateTexture(64,64)
SetBuffer TextureBuffer(stripes)
ClsColor 240,120,30
Cls
Color 120,30,120
For x=0 To 63 Step 16
    Rect x,0,8,64,True
Next
SetBuffer BackBuffer()

cube=CreateCube()

; Mode 2 makes the shader sample its Pattern texture
shader=LoadShader("assets/help_surface.b3shader")
ShaderInt shader,"Mode",2
EntityShader cube,shader

use_stripes=False

While Not KeyDown(1)

    ; Press Space to swap the bound texture
    If KeyHit(57) Then use_stripes=Not use_stripes

    ; Bind a texture to the shader's Pattern stage
    If use_stripes Then ShaderTexture shader,"Pattern",stripes Else ShaderTexture shader,"Pattern",checker

    TurnEntity cube,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: swap texture   Arrow keys: move camera   Esc: exit"
    If use_stripes Then Text 0,20,"ShaderTexture shader,"+Chr$(34)+"Pattern"+Chr$(34)+",stripes" Else Text 0,20,"ShaderTexture shader,"+Chr$(34)+"Pattern"+Chr$(34)+",checker"

    Flip

Wend

FreeShader shader
End