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/************************** * 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);}