;
; ------------------------------------------------------------
;
;   PureBasic - SetMeshData
;
;    (c) Fantaisie Software
;
; ------------------------------------------------------------
;

IncludeFile #PB_Compiler_Home + "examples/3d/Screen3DRequester.pb"

#CameraSpeed = 1
#NbX=30
#NbZ=30

#Camera   = 0
#Entity   = 0
#Light    = 0
#Material = 0
#Mesh     = 0

Global.f AngleVague, WaveFrequency, WavePeriodX, WavePeriodZ, WaveAmplitude
WaveFrequency=3  ;=waves/second
WavePeriodX  =9  ;=1/Wave length
WavePeriodZ  =11 ;=1/Wave length
WaveAmplitude=3

Define.f KeyX, KeyY, MouseX, MouseY

Global Dim MeshData.MeshVertex(0)

Declare UpdateMatrix()
Declare CreateMatrix()

If InitEngine3D()
 
  Add3DArchive(#PB_Compiler_Home + "examples/3d/Data/Textures", #PB_3DArchive_FileSystem)
  Add3DArchive(#PB_Compiler_Home + "examples/3d/Data/Packs/skybox.zip", #PB_3DArchive_Zip)
  Add3DArchive(#PB_Compiler_Home + "examples/3d/Data/Scripts", #PB_3DArchive_FileSystem)
  Parse3DScripts()
 
  InitSprite()
  InitKeyboard()
  InitMouse()
 
  If Screen3DRequester()
   
    ;-Material
    GetScriptMaterial(#Material, "Scene/GroundBlend")
    MaterialCullingMode(#Material, 1)
   
    ;-Mesh
    CreateMatrix()
   
    ;-Camera
    CreateCamera(#Camera, 0, 0, 100, 100)
    MoveCamera(#Camera, 0, 50, 80, #PB_Absolute)
    CameraLookAt(#Camera, 0, 0, 0)
    CameraBackColor(#Camera, RGB(90, 0, 0))
   
    ;-Light
    CreateLight(#Light, RGB(255, 255, 255), 20, 150, 120)
    AmbientColor(RGB(90, 90, 90))
   
    ;- Skybox
    SkyBox("stevecube.jpg")
   
    Repeat
      Screen3DEvents()
     
      If ExamineKeyboard()
       
        If KeyboardPushed(#PB_Key_Left)
          KeyX = -#CameraSpeed
        ElseIf KeyboardPushed(#PB_Key_Right)
          KeyX = #CameraSpeed
        Else
          KeyX = 0
        EndIf
       
        If KeyboardPushed(#PB_Key_Up)
          KeyY = -#CameraSpeed
        ElseIf KeyboardPushed(#PB_Key_Down)
          KeyY = #CameraSpeed
        Else
          KeyY = 0
        EndIf
       
      EndIf
     
      If ExamineMouse()
        MouseX = -(MouseDeltaX()/10)
        MouseY = -(MouseDeltaY()/10)
      EndIf
      MoveCamera  (#Camera, KeyX, 0, KeyY)
      RotateCamera(#Camera,  MouseY, MouseX, 0, #PB_Relative)
     
      ; Waves
      UpdateMatrix()
      AngleVague = AngleVague+WaveFrequency
     
      RenderWorld()
     
      FlipBuffers()
    Until KeyboardPushed(#PB_Key_Escape) Or Quit = 1
  EndIf
 
Else
  MessageRequester("Error", "The 3D Engine can't be initialized", 0)
EndIf

End

;-Procedures
Procedure DrawMatrix()
  Protected.l a, b, c, Nb
  Protected.w P1, P2, P3, P4
 
  For b=0 To #Nbz
    For a=0 To #NbX
      MeshVertexPosition(a - #NbX/2, 0, b - #Nbz/2)
      MeshVertexNormal(0,1,0)
      MeshVertexTextureCoordinate(a/#NbX, b/#Nbz)
    Next a
  Next b
 
  Nb=#NbX+1
  For b=0 To #NbZ-1
    For a=0 To #NbX-1
      P1=a+(b*Nb)
      P2=P1+1
      P3=a+(b+1)*Nb
      P4=P3+1
     
      MeshFace(P3, P2, P1)
      MeshFace(P2, P3, P4)
    Next
  Next
EndProcedure

Procedure CreateMatrix()
 
  CreateMesh(#Mesh)
  DrawMatrix()
  FinishMesh(#True)
  SetMeshMaterial(#Mesh, MaterialID(#Material))

  CreateEntity(#Entity, MeshID(#Mesh), #PB_Material_None)
  ScaleEntity(#Entity, 2, 2, 2)
  GetMeshData(#Mesh,0, MeshData(), #PB_Mesh_Vertex, 0, MeshVertexCount(#Mesh)-1)
EndProcedure

Procedure UpdateMatrix()
  Protected.l a, b, c
 
  For b=0 To #Nbz
    For a=0 To #NbX
      MeshData(c)\y=Sin(Radian((AngleVague+a*WavePeriodX+b*WavePeriodZ)))*WaveAmplitude
      c + 1
    Next a
  Next b
  
  SetMeshData(#Mesh, 0, MeshData(), #PB_Mesh_Vertex, 0, MeshVertexCount(#Mesh)-1)
EndProcedure