Option Explicit

Dim DX7 As New DirectX7
Dim DD7 As DirectDraw7
Dim SurfaceDesc As DDSURFACEDESC2
Dim PrimarySurface As DirectDrawSurface7
Dim BackBuffer As DirectDrawSurface7

Dim running As Boolean
Dim FPSCounter As Single
Dim FPS As Single
Dim FPSTickLast As Long

Private Sub Form_Load()
  Me.Show
  Me.Refresh

  Initialization
  running = True

  Do
    BackBuffer.SetForeColor vbRed
    BackBuffer.SetFont Me.Font
    BackBuffer.DrawText 10, 10, "DirectDraw im Fullscreen", False
    BackBuffer.DrawText 10, 30, "<Esc> beendet das Programm", False
    BackBuffer.DrawText 10, 50, "FPS: " & Format(FPS, "0.0"), False

    PrimarySurface.Flip Nothing, DDFLIP_WAIT

    ClearBuffer vbBlack

    If FPSCounter = 30 Then
      If FPSTickLast <> 0 Then _
          FPS = 1000 * 30 / (GetTime - FPSTickLast) + 1
      FPSTickLast = GetTime
      FPSCounter = 0
    End If
    FPSCounter = FPSCounter + 1

    DoEvents
  Loop While running

  Terminate
End Sub

Private Sub Form_KeyPress(KeyAscii As Integer)
  If (KeyAscii = vbKeyEscape) Then running = False
End Sub

Sub Initialization()
  Set DD7 = DX7.DirectDrawCreate("")
  DD7.SetCooperativeLevel Me.hWnd, DDSCL_EXCLUSIVE Or _
      DDSCL_FULLSCREEN Or DDSCL_ALLOWREBOOT
  DD7.SetDisplayMode 800, 600, 16, 0, DDSDM_DEFAULT

  With SurfaceDesc
    .lFlags = DDSD_CAPS Or DDSD_BACKBUFFERCOUNT
    .ddsCaps.lCaps = DDSCAPS_PRIMARYSURFACE Or DDSCAPS_FLIP Or _
        DDSCAPS_COMPLEX
    .lBackBufferCount = 1
  End With
  Set PrimarySurface = DD7.CreateSurface(SurfaceDesc)

  SurfaceDesc.ddsCaps.lCaps = DDSCAPS_BACKBUFFER
  Set BackBuffer = _
      PrimarySurface.GetAttachedSurface(SurfaceDesc.ddsCaps)
End Sub

Sub Terminate()
  DD7.RestoreDisplayMode
  DD7.SetCooperativeLevel Me.hWnd, DDSCL_NORMAL

  Set PrimarySurface = Nothing
  Set DD7 = Nothing
  Set DX7 = Nothing
  End
End Sub

Sub ClearBuffer(Color As Long)
  Dim DestRect As RECT

  With DestRect
    .Bottom = 600
    .Left = 0
    .Right = 800
    .Top = 0
  End With
  BackBuffer.BltColorFill DestRect, Color
End Sub

Function GetTime() As Long
  GetTime = DX7.TickCount
End Function