Create viewport on window with other win32 controls...

Posted on 2004-08-27
Last Modified: 2013-12-06
I have a window,  600 x 400, and I want to display a small gl drawing viewport on the right 300 pixels (or near that), and the left to contain various controls.

I've tried simply calling  glViewport(300,375,250,250), but the whole window becomes black,  overwriting my controls...

What am I doing wrong?

Here's my WinMain

int WINAPI WinMain( HINSTANCE hInstance,  HINSTANCE hPrevInstance,LPSTR lpCmdLine,int iCmdShow )
    time_t now;
      srand(now % 65535);
      WNDCLASS wc;
    HWND hWnd;
      HWND hwnd_static1, hStatic2;

    HDC hDC;
    HGLRC hRC;
    MSG msg;
    BOOL bQuit = FALSE;
    float theta = 0.0f;

    // register window class = CS_OWNDC;
    wc.lpfnWndProc = WndProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = LoadIcon( NULL, IDI_APPLICATION );
    wc.hCursor = LoadCursor( NULL, IDC_ARROW );
    wc.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
    wc.lpszMenuName = MAKEINTRESOURCE(IDR_MENU1);
    wc.lpszClassName = "openGL";
      RegisterClass( &wc );

      // create window
      hWnd = CreateWindow(
                  "Fur Generator",
                  175, 50, 600, 300,
                  NULL, NULL, hInstance, NULL );


      lf.lfHeight = 14;
      lf.lfWeight = 500;
      hFont = CreateFontIndirect(&lf); //or any other font creation method chosen;
      lf.lfHeight = 12;
      hSmallFont = CreateFontIndirect(&lf);

//+++ make "create" button
      hButton1 = CreateWindow("BUTTON","Create",WS_CHILD | WS_VISIBLE ,190,180,100,20, hWnd,(HMENU)ID_BUTTON1,hInstance,NULL);

      SendMessage(hButton1, WM_SETFONT, (WPARAM)hFont, 1);

//--- made create button

//+++ make "source" button
      hButton1 = CreateWindow("BUTTON","Source File",WS_CHILD | WS_VISIBLE ,10,0,100,20, hWnd,(HMENU)ID_BUTTON_SOURCE,hInstance,NULL);

      SendMessage(hButton1, WM_SETFONT, (WPARAM)hSmallFont, 1);
//--- made source button

//+++ make "output" button
      hButton1 = CreateWindow("BUTTON","Output File",WS_CHILD | WS_VISIBLE ,10,21,100,20, hWnd,(HMENU)ID_BUTTON_SOURCE,hInstance,NULL);

      SendMessage(hButton1, WM_SETFONT, (WPARAM)hSmallFont, 1);
//--- made output button

//+++ make "preview" outline  (until glviewport works)
      HWND gloutput = CreateWindow("static","",WS_BORDER | WS_CHILD | WS_VISIBLE ,350,15,220,220, hWnd,(HMENU)ID_BUTTON_SOURCE,hInstance,NULL);
       HWND gloutputlabel = CreateWindow("static","preview", WS_CHILD | WS_VISIBLE ,350,0,220,220, hWnd,(HMENU)ID_BUTTON_SOURCE,hInstance,NULL);
            SendMessage(gloutputlabel , WM_SETFONT, (WPARAM)hFont, 1);
//--- made output frame

//+++ make the source object dropdown

      hwnd_static1 = CreateWindow("static","Objects:",WS_CHILD | WS_VISIBLE | SS_LEFT,10,50,200,18,hWnd,NULL,hInstance,NULL);
      SendMessage(hwnd_static1, WM_SETFONT, (WPARAM)hFont, 1);
      SetWindowText(hwnd_static1,"Source Object");
      hSourceCombo = CreateWindow("combobox", "", WS_BORDER  | WS_CHILD | WS_VISIBLE | CBS_DROPDOWNLIST | WS_TABSTOP,110,45,160,100,hWnd,NULL,hInstance,NULL);

      SendMessage(hSourceCombo, WM_SETFONT, (WPARAM)hFont, 1);

//--- made source object dropdown


// +++  create percent edit box etc...

      hEditPercent= CreateWindow("edit","0", WS_BORDER  | WS_TABSTOP | WS_CHILD | WS_VISIBLE | SS_RIGHT,10,90,35,20,hWnd,NULL,hInstance,NULL);
      hStatic2 = CreateWindow("static","% of points used:",WS_CHILD | WS_VISIBLE | SS_LEFT,47,92,120,18,hWnd,NULL,hInstance,NULL);

    SendMessage(hStatic2, WM_SETFONT, (WPARAM)hFont, 1);
      SendMessage(hEditPercent, WM_SETFONT, (WPARAM)hFont, 1);
// --- created percent edit box, etc...


      EnableOpenGL( hWnd, &hDC, &hRC );

      // main program loop
      while ( !bQuit ) {

            if ( PeekMessage( &msg, NULL, 0, 0, PM_REMOVE ) ) {

                  // handle or dispatch messages
                  if ( msg.message == WM_QUIT ) {
                        bQuit = TRUE;
                  } else {
                        TranslateMessage( &msg );
                        DispatchMessage( &msg );

            } else {

                  glClearColor( 0.0f, 0.0f, 0.0f, 0.0f );
                  glClear( GL_COLOR_BUFFER_BIT );

                  SwapBuffers( hDC );
            } // else

      } // while peek_message

      return msg.lParam;

} // end of winmain
Question by:a1programmer

Accepted Solution

davidnsc1 earned 500 total points
ID: 12036368
I don't have a true answer, but, seeing that you haven't gotten a response yet, I might as well suggest a possible cause.  It's possible that the double-buffering is causing problems with the window, since you're swapping the buffer of the whole hDC and Windows doesn't draw to back buffers.

Wish I could be more help!

Author Comment

ID: 12044471
Thanks...   I actually found a way to do it.  I created a child window inside the window, and used it to draw on. ;)

I did try not doing the double buffering, and using a PFD_SUPPORT_GDI (or whatever) , but this is better.


Expert Comment

ID: 12271872
the child-frame is one way, but you could get some problems, when you try to draw i.e. an background to the whole window. In this case it would be more easy to lay viewport and Ortho to the whole screen an enable the glScissorBox to your drawing-area. Thus your controlls will not be overwritten...

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