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  ;-------------------------------------------------
  ;|                                               |
  ;|     Before 80x86 Assembly Code Formatting     |
  ;|                                               |
  ;-------------------------------------------------

  .386
  .MODEL FLAT,STDCALL

    include  windows.inc
       INCLUDE user32.inc
   Include       kernel32.inc
     incLUDE    gdi32.inc

  .datA
    ClassName DB "SimpleWinClass",0
   AppName db "Bezier Splines",0

  .cODE
  start:
  INvoke    GetModuleHandle,         NULL
   mov  hInstance, eax
  	  inVOKE         GetCommandLine
    INVOKE WinMain,   hInstance, NULL, CommandLine,  SW_SHOWDEFAULT
  INvoke     ExitProcess,     eax

  WinMain proc hInst:HINSTANCE,hPrevInst:HINSTANCE,CmdLine:LPSTR,CmdShow:SDWORD
  LOCAL  wc:WNDCLASSEX
  	local        msg:MSG
   Local  hwnd:HWND

  @main: Mov   wc.cbSize,     SIZEOF WNDCLASSEX
  mov            wc.style,  CS_HREDRAW or CS_VREDRAW
  	mov wc.lpfnWndProc,   OFFSET WndProc
     mov       wc.cbClsExtra,  NULL
   Mov   wc.cbWndExtra, NULL
              push      hInstance
      pop      wc.hInstance
  	MOV wc.hbrBackground,COLOR_WINDOW+1
  	 mov         wc.lpszMenuName,NULL
  	mov   wc.lpszClassName,OFFSET ClassName
        invoke LoadIcon,NULL,IDI_APPLICATION
  	MOV   wc.hIcon,eax
          mov   wc.hIconSm,0
      invoke   LoadCursor,NULL,IDC_ARROW
  	mOV wc.hCursor,   eax
  invoke RegisterClassEx, addr wc ; create window
    INVOKE CreateWindowEx,NULL,ADDR ClassName,ADDR AppName,\
  WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,\
  CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,\
  hInst,NULL
    mov       hwnd,eax
      INVoke ShowWindow, hwnd,SW_SHOWNORMAL
   INVOKE UpdateWindow, hwnd
  .whiLE TRUE ; loop
          Invoke        GetMessage, addr msg,NULL,0,0
    .BREAK .IF (!eax)
      INVOKE    TranslateMessage, Addr msg
  INVOKE    DispatchMessage,    ADDR msg
                .ENDW ; end loop
   mov  eax,msg.wParam
             ret
  WinMain ENDP

  SetupOpenGL PROC hWnd
  LoCAL pfd:PIXELFORMATDESCRIPTOR
  LOCAL pixformat:DWORD
   invoke GetDC,  hWnd
      mov hdc,        EAX
  ZeroMemory pfd,   sizeof(PIXELFORMATDESCRIPTOR)
  
  .IF eax == 2
  mov     pfd.nSize,  sizeof(PIXELFORMATDESCRIPTOR)
   mov     pfd.nVersion,1
       .ELSE
     MOV   pfd.dwFlags, PFD_SUPPORT_OPENGL OR PFD_DOUBLEBUFFER OR PFD_DRAW_TO_WINDOW
   mov   pfd.dwLayerMask,   PFD_MAIN_PLANE
       MOV      pfd.iPixelType,     PFD_TYPE_RGBA
  .ENDIF

   mov    pfd.cColorBits,  16
  mov        pfd.cDepthBits, 16
   Mov         pfd.cAccumBits,            0
   mov pfd.cStencilBits,  0
      invoke          ChoosePixelFormat,  hdc, addr pfd
               mov  pixformat,   Eax
   invoke      SetPixelFormat,hdc,pixformat,ADDR pfd

  ; position viewer
   _glMatrixMode GL_MODELVIEW
          _glTranslatef 0.0f,      0.0f,-2.0f

         ; position light
   INVOKE glLightfv,     GL_LIGHT0,GL_POSITION,   ADDR lightPos
     _glEnable GL_LIGHTING
  _glEnable GL_LIGHT0
            _glEnable GL_DEPTH_TEST
      _glShadeModel GL_SMOOTH
             ret
  SetupOpenGL ENDP

  end start

  ;-------------------------------------------------
  ;|                                               |
  ;|     After 80x86 Assembly Code Formatting      |
  ;|                                               |
  ;-------------------------------------------------

  .386
  .model flat, stdcall

  include windows.inc
  include user32.inc
  include kernel32.inc
  include gdi32.inc

  .data
  ClassName  db "SimpleWinClass", 0
  AppName    db "Bezier Splines", 0

  .code
  start:
             invoke GetModuleHandle, NULL
             mov    hInstance, EAX
             invoke GetCommandLine
             invoke WinMain, hInstance, NULL, CommandLine, SW_SHOWDEFAULT
             invoke ExitProcess, EAX

  ;--------------------------------------------------------------------------

  WinMain proc hInst:HINSTANCE, hPrevInst:HINSTANCE, CmdLine:LPSTR, CmdShow:SDWORD
             local       wc:WNDCLASSEX
             local       msg:MSG
             local       hwnd:HWND

  @main:     mov         wc.cbSize, sizeof WNDCLASSEX
             mov         wc.style, CS_HREDRAW or CS_VREDRAW
             mov         wc.lpfnWndProc, offset WndProc
             mov         wc.cbClsExtra, NULL
             mov         wc.cbWndExtra, NULL
             push        hInstance
             pop         wc.hInstance
             mov         wc.hbrBackground, COLOR_WINDOW+1
             mov         wc.lpszMenuName, NULL
             mov         wc.lpszClassName, offset ClassName
             invoke      LoadIcon, NULL, IDI_APPLICATION
             mov         wc.hIcon, EAX
             mov         wc.hIconSm, 0
             invoke      LoadCursor, NULL, IDC_ARROW
             mov         wc.hCursor, EAX
             invoke      RegisterClassEx, addr wc                              ; create window
             invoke      CreateWindowEx, NULL, addr ClassName, addr AppName, \
                         WS_OVERLAPPEDWINDOW , CW_USEDEFAULT, \
                         CW_USEDEFAULT       , CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, \
                         hInst               , NULL
             mov         hwnd, EAX
             invoke      ShowWindow, hwnd, SW_SHOWNORMAL
             invoke      UpdateWindow, hwnd
             .while      TRUE                                                  ; loop
                         invoke              GetMessage, addr msg, NULL, 0, 0
                         .break              .if (!EAX)
                         invoke              TranslateMessage, addr msg
                         invoke              DispatchMessage, addr msg
             .endw       ; end loop
             mov         EAX, msg.wParam
             ret
  WinMain endp

  ;--------------------------------------------------------------------------

  SetupOpenGL proc hWnd
      local       pfd:PIXELFORMATDESCRIPTOR
      local       pixformat:DWORD
      invoke      GetDC, hWnd
      mov         hdc, EAX
      ZeroMemory  pfd, sizeof(PIXELFORMATDESCRIPTOR)

      .if         EAX == 2
                  mov       pfd.nSize, sizeof(PIXELFORMATDESCRIPTOR)
                  mov       pfd.nVersion, 1
      .else
                  mov       pfd.dwFlags, PFD_SUPPORT_OPENGL or PFD_DOUBLEBUFFER or PFD_DRAW_TO_WINDOW
                  mov       pfd.dwLayerMask, PFD_MAIN_PLANE
                  mov       pfd.iPixelType, PFD_TYPE_RGBA
      .endif

      mov         pfd.cColorBits, 16
      mov         pfd.cDepthBits, 16
      mov         pfd.cAccumBits, 0
      mov         pfd.cStencilBits, 0
      invoke      ChoosePixelFormat, hdc, addr pfd
      mov         pixformat, EAX
      invoke      SetPixelFormat, hdc, pixformat, addr pfd

      ; position viewer
      _glMatrixMode GL_MODELVIEW
      _glTranslatef 0.0f, 0.0f, -2.0f

      ; position light
      invoke        glLightfv, GL_LIGHT0, GL_POSITION, addr lightPos
      _glEnable     GL_LIGHTING
      _glEnable     GL_LIGHT0
      _glEnable     GL_DEPTH_TEST
      _glShadeModel GL_SMOOTH
      ret
  SetupOpenGL endp

  end start

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