Lesson 1 Nehe

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#include <gl/opengl.h>HGLRC       hRc = NULL;             // opengl 着色描述表HDC         hDc = NULL;             // Windows 设备描述表/*    opengl 中将着色描述表与设备描述相与联接，设备描述表与GDI相互联接，从而绘图。总体顺序：    hRc -> hDc -> GDI*/HWND        hWnd = NULL;HINSTANCE   hInstance = NULL;BOOL keys[256];BOOL active = TRUE;                 // 当激活状态为假是时，暂停程序操做BOOL fullscreen = TRUE;LRESULT CALLBACK WindowProc( HWND, UINT, WPARAM, LPARAM);GLvoid ReSizeGLScene(GLsizei width, GLsizei height){    if (height == 0) height = 1;    glViewport(0,0,width, height);    glMatrixMode(GL_PROJECTION);    glLoadIdentity();    // 设置视口大小    gluPerspective(45.0f, (GLfloat)width/(GLfloat)height,0.1f, 100.0f);    glMatrixMode(GL_MODELVIEW);    glLoadIdentity();}int InitGL(GLvoid){    glShadeModel(GL_SMOOTH);    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);    // 开启深度测试类型    glClearDepth(1.0f);    glEnable(GL_DEPTH_TEST);    glDepthFunc(GL_LEQUAL);    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);    return TRUE;}BOOL DrawGLScene(GLvoid){    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);    glLoadIdentity();    return TRUE;}GLvoid KillGLWindow(GLvoid){    if (fullscreen){        ChangeDisplaySettings(NULL, 0);        ShowCursor(TRUE);    }    if (hRc){        // 个人感觉此函数为 HRC 与HDC 建产相互联系的函数        if (!wglMakeCurrent(NULL, NULL)){            MessageBox(NULL, "释放DC或RC失败。","关闭错误",MB_OK|MB_CANCELTRYCONTINUE);        }        if (!wglDeleteContext(hRc)){            MessageBox(NULL, "释放RC失败。","关闭错误",MB_OK|MB_CANCELTRYCONTINUE);        }        hRc = NULL;    }    if (hDc && !ReleaseDC(hWnd, hDc)){        MessageBox(NULL, "释放DC失败。","关闭错误",MB_OK|MB_CANCELTRYCONTINUE);        hDc = NULL;    }    if (hWnd && !DestroyWindow(hWnd)){        MessageBox(NULL, "释放窗口句柄失败。","关闭错误",MB_OK|MB_CANCELTRYCONTINUE);        hWnd = NULL;    }    if (!UnregisterClass("opengl", hInstance)){        MessageBox(NULL, "不能注销窗口类。","关闭错误",MB_OK|MB_CANCELTRYCONTINUE);        hInstance = NULL;    }}BOOL CreateGLWindow(char* title, int width, int height, int bits, BOOL fullscreenflag){    GLuint PixelFormat;         // 保存查找匹配的结果    WNDCLASS wc;    DWORD dwExStyle;            // 扩展窗口风格    DWORD dwStyle;              // 窗口风格    // windows 的窗口    RECT WindowRect;    WindowRect.left = static_cast<long>(0);    WindowRect.right = static_cast<long>(width);    WindowRect.top = static_cast<long>(0);    WindowRect.bottom = static_cast<long>(height);    // 全屏标志    fullscreen = fullscreenflag;    // 窗口类的定义    hInstance       = GetModuleHandle(NULL);    wc.style            = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;    wc.lpfnWndProc      = WindowProc;    wc.cbClsExtra       = 0;    wc.cbWndExtra       = 0;    wc.hInstance        = hInstance;    wc.hIcon            = LoadIcon(NULL, IDI_WINLOGO);    wc.hCursor          = LoadCursor(NULL, IDC_ARROW);    wc.hbrBackground    = NULL;    wc.lpszMenuName     = NULL;    wc.lpszClassName    = "opengl";    // 注册窗口类    if (!RegisterClass(&wc)){        MessageBox(NULL, "注册窗口失败", "错误", MB_OK|MB_ICONEXCLAMATION);        return FALSE;    }    // 全屏模式判断，操做    if (fullscreen){        DEVMODE dmScreenSetting;        memset(&dmScreenSetting, 0, sizeof(dmScreenSetting));        dmScreenSetting.dmSize          = sizeof(dmScreenSetting);        dmScreenSetting.dmPelsHeight    = height;        dmScreenSetting.dmPelsWidth     = width;        dmScreenSetting.dmBitsPerPel    = bits;        dmScreenSetting.dmFields        = DM_BITSPERPEL|DM_PELSHEIGHT|DM_PELSWIDTH;        // 设置显示模式        if (ChangeDisplaySettings(&dmScreenSetting, CDS_FULLSCREEN) != DISP_CHANGE_SUCCESSFUL){            if (MessageBox(NULL, "全屏模式在当前显卡上设置失败!\n使用窗口模式?","NeHe G",MB_YESNO|MB_ICONEXCLAMATION) == IDYES){                fullscreen = FALSE;            }            else{                MessageBox(NULL, "程序将被关闭", "错误", MB_OK|MB_ICONSTOP);                return FALSE;            }        }    }    // 出错后进行的相应操作    if (fullscreen){        // WS_EX_APPWINDOW         // Forces a top-level window onto the taskbar when the window is visible.        dwExStyle = WS_EX_APPWINDOW;        dwStyle = WS_POPUP;        ShowCursor(FALSE);    }    else{        dwExStyle = WS_EX_APPWINDOW | WS_EX_WINDOWEDGE;        dwStyle = WS_OVERLAPPEDWINDOW;    }    AdjustWindowRectEx(&WindowRect,dwStyle,FALSE, dwExStyle);    if (! (hWnd = CreateWindowEx(dwExStyle,                         "opengl",                         title,                        WS_CLIPSIBLINGS|                        WS_CLIPCHILDREN|                        dwStyle,                         0, 0,                        WindowRect.right-WindowRect.left,                         WindowRect.bottom-WindowRect.top,                         NULL,                         NULL,                         hInstance,                        NULL))){            KillGLWindow();            MessageBox(NULL, "不能创建一个窗口设备描述表", "错误", MB_OK|MB_ICONEXCLAMATION);            return FALSE;    }    static PIXELFORMATDESCRIPTOR pfd = {        sizeof(PIXELFORMATDESCRIPTOR),        1,        PFD_DRAW_TO_WINDOW |                // 支持窗口        PFD_SUPPORT_OPENGL|                 // 支持 opengl        PFD_DOUBLEBUFFER,        PFD_TYPE_RGBA,        bits,        0, 0, 0, 0, 0, 0,               // 忽略的色彩位        0,                              // 无Alpha缓存        0,                              // 忽略Shift Bit        0,                              // 无累加缓存        0, 0, 0, 0,                         // 忽略聚集位        16,                             // 16位 Z-缓存 (深度缓存)        0,                              // 无蒙板缓存        0,                              // 无辅助缓存        PFD_MAIN_PLANE,                         // 主绘图层        0,                              // Reserved        0, 0, 0                             // 忽略层遮罩    };    if (!(hDc = GetDC(hWnd))){        KillGLWindow();        MessageBox(NULL, "不能创建一种相匹配的像素格式", "错误", MB_OK|MB_ICONEXCLAMATION);        return FALSE;    }    if (!(PixelFormat = ChoosePixelFormat(hDc, &pfd))){        KillGLWindow();        MessageBox(hWnd, "不能设置像素格式", "错误", MB_OK|MB_ICONEXCLAMATION);        return FALSE;    }    if (!SetPixelFormat(hDc, PixelFormat, &pfd)){        KillGLWindow();        MessageBox(hWnd, "不能设置像素格式", "错误", MB_OK|MB_ICONEXCLAMATION);        return FALSE;    }    if (!(hRc = wglCreateContext(hDc))){        KillGLWindow();        MessageBox(NULL, "不能创建openGL渲染描述表","错误",MB_OK|MB_ICONEXCLAMATION);        return FALSE;    }    if (!(wglMakeCurrent(hDc, hRc))){        KillGLWindow();        MessageBox(NULL, "不能激活当前的openGL渲染描述表", "错误", MB_OK|MB_ICONEXCLAMATION);        return FALSE;    }    ShowWindow(hWnd, SW_SHOW);    SetForegroundWindow(hWnd);    SetFocus(hWnd);    ReSizeGLScene(width, height);    if (!InitGL()){        KillGLWindow();        MessageBox(NULL, "Initialization Failed.","error",MB_OK|MB_ICONEXCLAMATION );        return FALSE;    }    return TRUE;}LRESULT CALLBACK WindowProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam){    switch(uMsg){    case WM_ACTIVATE:         {            if (!HIWORD(wParam))                active = TRUE;            else                active = FALSE;            return 0;        }    case WM_SYSCOMMAND:        {            switch(wParam){            case SC_SCREENSAVE:                // 屏保运行代码            case SC_MONITORPOWER:                // 进入节电模式运行代码                return 0;            }            break;        }    case WM_CLOSE:        {            PostQuitMessage(0);            return 0;        }    case WM_KEYUP:        {            keys[wParam] = TRUE;            return 0;        }    case WM_KEYDOWN:        {            keys[wParam] = FALSE;            return 0;        }    case WM_SIZE:        {            ReSizeGLScene(LOWORD(lParam), HIWORD(lParam));            return 0;        }    }    return DefWindowProc(hWnd, uMsg, wParam, lParam);}int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow ){    MSG msg;    BOOL done=FALSE;    // 提示用户选择运行模式    if (MessageBox(NULL, "你想在全屏模式下运行吗？", "设置全屏模式", MB_YESNO|MB_ICONEXCLAMATION) == IDNO)        fullscreen = FALSE;    if (!CreateGLWindow("Nehe's openGL 程序框架", 640, 480, 16, fullscreen))        return 0;    while (!done){        if (PeekMessage(&msg, NULL, 0,0,PM_REMOVE)){            if (msg.message == WM_QUIT){                done = TRUE;            }            else{                TranslateMessage(&msg);                DispatchMessage(&msg);            }        }        else{                               // 当没有消息时，进行的操做            if (active){                if (keys[VK_ESCAPE]){                    done = TRUE;                }                else{                    DrawGLScene();                    SwapBuffers(hDc);                               }                if (keys[VK_F1]){                    keys[VK_F1] =FALSE;                    KillGLWindow();                    fullscreen = !fullscreen;                    // 重建opengl窗口                    if (!CreateGLWindow("Nehe's openGL 程序框架", 640, 480, 16, fullscreen))                    return 0;                }            }        } // end if         } //end while     KillGLWindow();    return (msg.wParam);}// end WinMain
这里写图片描述
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