'triangle' won't appear in window

This is a discussion on 'triangle' won't appear in window within the Game Programming forums, part of the General Programming Boards category; In my app, I have to windows...I have (attempted) to allow one (the edit window) to support OpenGL....the 'triangle' rendered ...

  1. #1
    The Right Honourable psychopath's Avatar
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    Unhappy 'triangle' won't appear in window

    In my app, I have to windows...I have (attempted) to allow one (the edit window) to support OpenGL....the 'triangle' rendered fine before i added the edit window. after adding the edit window, and specifying that I wanted to inititilize OGL for the window 'edit_box', it diddn't work..my code is as follows:

    Code:
    // Include files
    #include <windows.h>
    #include <gl/gl.h>
    //end include files
    
    HWND edit_box = NULL;
    
    // Function Declarations
    LRESULT CALLBACK WndProc( HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam );
    VOID EnableOpenGL( HWND hWnd, HDC * hDC, HGLRC * hRC );
    VOID DisableOpenGL( HWND hWnd, HDC hDC, HGLRC hRC );
    
    // WinMain
    int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int iCmdShow )
    {
    WNDCLASS wc;
    WNDCLASS ed;
    HWND hwnd;
    HDC hdc;
    HGLRC gl_hrc;
    MSG msg;
    BOOL bQuit = FALSE;
    float theta = 0.0f;
    
    // register window class
    wc.style = 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)GetStockObject( GRAY_BRUSH );
    wc.lpszMenuName = NULL;
    wc.lpszClassName = "PsychoEngine";
    RegisterClass( &wc );
    
    //regester edit class
    ed.style = CS_OWNDC;
    ed.lpfnWndProc = WndProc;
    ed.cbClsExtra = 0;
    ed.cbWndExtra = 0;
    ed.hInstance = hInstance;
    ed.hIcon = LoadIcon( NULL, IDI_APPLICATION );
    ed.hCursor = LoadCursor( NULL, IDC_ARROW );
    ed.hbrBackground = (HBRUSH)GetStockObject( BLACK_BRUSH );
    ed.lpszMenuName = NULL;
    ed.lpszClassName = "EDIT";
    RegisterClass( &ed );
    
    // create main window
    hwnd = CreateWindow(
    "PsychoEngine", "PsychoEngine | PsychopathProductions",
    WS_CAPTION | WS_POPUPWINDOW | WS_VISIBLE,
    0, 0, 800, 570,
    NULL, NULL, hInstance, NULL );
    
    // enable OpenGL for the window
    EnableOpenGL( edit_box, &hdc, &gl_hrc );
    
    // program main loop
    while ( !bQuit ) {
    
    // check for messages
    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 {
    
    // OpenGL animation code goes here
    glClearColor( 0.0f, 0.0f, 0.0f, 0.0f );
    glClear( GL_COLOR_BUFFER_BIT );
    
    glPushMatrix();
    glBegin( GL_TRIANGLES );
    glColor3f( 1.0f, 0.0f, 0.0f ); glVertex2f( 0.0f, 1.0f );
    glColor3f( 0.0f, 1.0f, 0.0f ); glVertex2f( 0.87f, -0.5f );
    glColor3f( 0.0f, 0.0f, 1.0f ); glVertex2f( -0.87f, -0.5f );
    glEnd();
    glPopMatrix();
    
    SwapBuffers( hdc );
    
    theta += 1.0f;
    
    }
    
    }
    
    // shutdown OpenGL
    DisableOpenGL( hwnd, hdc, gl_hrc );
    
    // destroy the window explicitly
    DestroyWindow( hwnd );
    
    return msg.wParam;
    
    }
    
    // Window Procedure
    
    LRESULT CALLBACK WndProc( HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam )
    {
    HWND edit_box = NULL;
    
    switch ( message )
    {
    case WM_CREATE:
    RECT rect;
               GetClientRect(hwnd,&rect);
               edit_box = CreateWindow("EDIT", "Edit Window",WS_CHILD | WS_BORDER | WS_CAPTION | WS_POPUPWINDOW | WS_VISIBLE,
    									0, 30, 600, 538, hwnd, NULL,
    									((LPCREATESTRUCT)lparam)->hInstance, NULL);
    break;
    
    case WM_CLOSE:
    MessageBox (NULL, "Are you sure you want to close the program?\nAll un-saved data will be lost." , "Exiting...", 0 + MB_YESNO + MB_DEFBUTTON2 + MB_ICONQUESTION);
    PostQuitMessage( 0 );
    break;
    return 0;
    
    case WM_DESTROY:
    break;
    return 0;
    
    case WM_KEYDOWN:
    switch ( wparam ) {
    
    case VK_ESCAPE:
    PostQuitMessage( 0 );
    break;
    return 0;
    
    }
    return 0;
    
    default:
    return DefWindowProc( hwnd, message, wparam, lparam );
    
    }
    
    }
    
    // Enable OpenGL
    
    VOID EnableOpenGL( HWND edit_box, HDC * hdc, HGLRC * gl_hrc )
    {
    PIXELFORMATDESCRIPTOR pfd;
    int iFormat;
    
    // get the device context (DC)
    *hdc = GetDC( edit_box );
    
    // set the pixel format for the DC
    ZeroMemory( &pfd, sizeof( pfd ) );
    pfd.nSize = sizeof( pfd );
    pfd.nVersion = 1;
    pfd.dwFlags = PFD_DRAW_TO_WINDOW | 
    PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
    pfd.iPixelType = PFD_TYPE_RGBA;
    pfd.cColorBits = 24;
    pfd.cDepthBits = 16;
    pfd.iLayerType = PFD_MAIN_PLANE;
    iFormat = ChoosePixelFormat( *hdc, &pfd );
    SetPixelFormat( *hdc, iFormat, &pfd );
    
    // create and enable the render context (RC)
    *gl_hrc = wglCreateContext( *hdc );
    wglMakeCurrent( *hdc, *gl_hrc );
    
    }
    
    // Disable OpenGL
    
    VOID DisableOpenGL( HWND edit_box, HDC hdc, HGLRC gl_hrc )
    {
    wglMakeCurrent( NULL, NULL );
    wglDeleteContext( gl_hrc );
    ReleaseDC( edit_box, hdc );
    }
    ...sorry...codes a little lengthy...anyway any help will be appreciated...

    -psychopath
    Last edited by psychopath; 04-17-2004 at 03:18 PM.

  2. #2
    and the hat of wrongness Salem's Avatar
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    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  3. #3
    The Right Honourable psychopath's Avatar
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    sorry...a little new to the board...added the code tags...anyway...can anyone help???

  4. #4
    mov.w #$1337,D0 Jeremy G's Avatar
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    use glvertex3f( x , y, z).
    And I think you can get THAT code to show you a triangle if you
    gltranslatef(0, 0, -2).
    before glBegin().
    c++->visualc++->directx->opengl->c++;
    (it should be realized my posts are all in a light hearted manner. And should not be taken offense to.)

  5. #5
    The Right Honourable psychopath's Avatar
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    no difference....remember the triangle DID show...but now that there are TWO windows, it wont show...which makes me think i diddn't specify openGL for the 'edit_box' window properly...?

  6. #6
    The Right Honourable psychopath's Avatar
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    nvm...got it working :

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