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    (C++) this is nesesary programming language

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    fondza [Admin]
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    Posts : 123
    Join date : 2009-10-03

    (C++) this is nesesary programming language

    Post by fondza [Admin] on Sat Oct 17, 2009 11:05 am

    I found this in one of the examples in the DevC compiler.
    It is really awesome. It is a triangle that spins. In one corner is blue, another red, and the last, green. They all meet in the middle. Its really awesome.


    /**************************
    * Includes
    *
    **************************/

    #include <windows.h>
    #include <gl/gl.h>


    /**************************
    * 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;
    HWND hWnd;
    HDC hDC;
    HGLRC 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 (BLACK_BRUSH);
    wc.lpszMenuName = NULL;
    wc.lpszClassName = "GLSample";
    RegisterClass (&wc);

    /* create main window */
    hWnd = CreateWindow (
    "GLSample", "OpenGL Sample",
    WS_CAPTION | WS_POPUPWINDOW | WS_VISIBLE,
    0, 0, 256, 256,
    NULL, NULL, hInstance, NULL);

    /* enable OpenGL for the window */
    EnableOpenGL (hWnd, &hDC, &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 ();
    glRotatef (theta, 0.0f, 0.0f, 1.0f);
    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;
    Sleep (1);
    }
    }

    /* shutdown OpenGL */
    DisableOpenGL (hWnd, hDC, hRC);

    /* destroy the window explicitly */
    DestroyWindow (hWnd);

    return msg.wParam;
    }


    /********************
    * Window Procedure
    *
    ********************/

    LRESULT CALLBACK WndProc (HWND hWnd, UINT message,
    WPARAM wParam, LPARAM lParam)
    {

    switch (message)
    {
    case WM_CREATE:
    return 0;
    case WM_CLOSE:
    PostQuitMessage (0);
    return 0;

    case WM_DESTROY:
    return 0;

    case WM_KEYDOWN:
    switch (wParam)
    {
    case VK_ESCAPE:
    PostQuitMessage(0);
    return 0;
    }
    return 0;

    default:
    return DefWindowProc (hWnd, message, wParam, lParam);
    }
    }


    /*******************
    * Enable OpenGL
    *
    *******************/

    void EnableOpenGL (HWND hWnd, HDC *hDC, HGLRC *hRC)
    {
    PIXELFORMATDESCRIPTOR pfd;
    int iFormat;

    /* get the device context (DC) */
    *hDC = GetDC (hWnd);

    /* 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) */
    *hRC = wglCreateContext( *hDC );
    wglMakeCurrent( *hDC, *hRC );

    }


    /******************
    * Disable OpenGL
    *
    ******************/

    void DisableOpenGL (HWND hWnd, HDC hDC, HGLRC hRC)
    {
    wglMakeCurrent (NULL, NULL);
    wglDeleteContext (hRC);
    ReleaseDC (hWnd, hDC);
    }

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