Lesson 5 Nehe

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#include <gl/opengl.h>HGLRC hRC = NULL;HDC   hDC = NULL;HWND  hWnd = NULL;HINSTANCE hInstance = NULL;BOOL keys[256];BOOL active = TRUE;BOOL fullscreen = FALSE;GLfloat rtri = 0.0f;GLfloat rquad = 360.0f;LRESULT CALLBACK WindowProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);GLvoid ReSizeGLScene(GLsizei width, GLsizei height){    // 如果高为0 ， 则设置其为1    if (height == 0) height = 1;    // 设置可以看到的视角    glViewport(0,0,width, height);    // 设置投影矩阵    glMatrixMode(GL_PROJECTION);    glLoadIdentity();    // 设置平截头体    gluPerspective(45.0f, (GLdouble)width/(GLdouble)height, 0.1f, 100.0f);    // 设置模型矩阵    glMatrixMode(GL_MODELVIEW);    glLoadIdentity();}GLvoid InitGL(){    glShadeModel(GL_SMOOTH);    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);    // 1.0f 为最大深度    glClearDepth(1.0f);    glEnable(GL_DEPTH_TEST);    glDepthFunc(GL_LEQUAL);    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);}BOOL DrawGLScene(){    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);    glLoadIdentity();    glTranslatef(-1.5f, 0.0f, -6.0f);    glRotatef(rtri, 1.0f, 0.0f, 0.0f);    glBegin(GL_TRIANGLES);    //面1    glColor3f(1.0f, 0.0f, 0.0f);    glVertex3f(0.0f, 1.0f, 0.0f);    glColor3f(0.0f, 1.0f, 0.0f);    glVertex3f(-1.0f, -1.0f, 1.0f);    glColor3f(0.0f, 0.0f, 1.0f);    glVertex3f(1.0f, -1.0f, 1.0f);    //面2    glColor3f(1.0f, 0.0f, 0.0f);    glVertex3f(0.0f, 1.0f, 0.0f);    glColor3f(0.0f, 0.0f, 1.0f);    glVertex3f(1.0f, -1.0f, 1.0f);    glColor3f(1.0f, 1.0f, 1.0f);    glVertex3f(1.0f, -1.0f, -1.0f);    // 面3    glColor3f(1.0f, 0.0f, 0.0f);    glVertex3f(0.0f, 1.0f, 0.0f);    glColor3f(1.0f, 1.0f, 1.0f);    glVertex3f(1.0f, -1.0f, -1.0f);    glColor3f(1.0f, 1.0f, 0.0f);    glVertex3f(-1.0f, -1.0f, -1.0f);    // 面4    glColor3f(1.0f, 0.0f, 0.0f);    glVertex3f(0.0f, 1.0f, 0.0f);    glColor3f(1.0f, 1.0f, 0.0f);    glVertex3f(-1.0f, -1.0f,-1.0f);    glColor3f(0.0f, 1.0f, 0.0f);    glVertex3f(-1.0f, -1.0f, 1.0f);    glEnd();    // 面5， 加个底面    glBegin(GL_QUADS);    glColor3f(0.0f, 1.0f, 0.0f); // 绿    glVertex3f(-1.0f, -1.0f, 1.0f);    glColor3f(0.0, 0.0f, 1.0f);  // 蓝    glVertex3f(1.0f, -1.0f, 1.0f);    glColor3f(1.0f, 1.0f, 1.0f); // 白    glVertex3f(1.0f, -1.0f, -1.0f);    glColor3f(1.0f, 1.0f, 0.0f); // 黄    glVertex3f(-1.0f, -1.0f, -1.0f);    glEnd();    glLoadIdentity();                   // 重置坐标系    glTranslatef(1.5f, 0.0f, -6.0f);    glRotatef(rquad, 1.0f, 0.0f, 0.0f);    // 画正方体    glBegin(GL_QUADS);    // 面1    glColor3f(1.0f, 0.0f, 0.0f);    glVertex3f(-1.0f, 1.0f, 1.0f);    glVertex3f(-1.0f,-1.0f, 1.0f);    glVertex3f( 1.0f,-1.0f, 1.0f);    glVertex3f( 1.0f, 1.0f, 1.0f);    // 面2    glColor3f(1.0f, 1.0f, 0.0f);    glVertex3f(1.0f, 1.0f, 1.0f);    glVertex3f(1.0f,-1.0f, 1.0f);    glVertex3f(1.0f,-1.0f,-1.0f);    glVertex3f(1.0f, 1.0f,-1.0f);    //面3    glColor3f(0.0f, 0.0f, 1.0f);    glVertex3f(-1.0f, 1.0f,-1.0f);    glVertex3f(-1.0f,-1.0f,-1.0f);    glVertex3f( 1.0f,-1.0f,-1.0f);    glVertex3f( 1.0f, 1.0f,-1.0f);    //面4    glColor3f(0.0f, 1.0f, 0.0f);    glVertex3f(-1.0f, 1.0f, 1.0f);    glVertex3f(-1.0f,-1.0f, 1.0f);    glVertex3f(-1.0f,-1.0f,-1.0f);    glVertex3f(-1.0f, 1.0f,-1.0f);    //面5    glColor3f(1.0f, 1.0f, 1.0f);    glVertex3f(-1.0f, 1.0f,-1.0f);    glVertex3f(-1.0f, 1.0f, 1.0f);    glVertex3f( 1.0f, 1.0f, 1.0f);    glVertex3f( 1.0f, 1.0f,-1.0f);    //面6    glColor3f(0.6f, 0.34f, 0.69f);    glVertex3f(-1.0f,-1.0f,-1.0f);    glVertex3f(-1.0f,-1.0f, 1.0f);    glVertex3f( 1.0f,-1.0f, 1.0f);    glVertex3f( 1.0f,-1.0f,-1.0f);    glEnd();    if (rtri>= 360.0f) rtri = 0.0f;    rtri += 0.2f;    if (rquad <= 0.0f) rquad = 360.0f;    rquad -= 0.15f;    return TRUE;}GLvoid KillGLWindow(){    if (fullscreen){        ChangeDisplaySettings(NULL, 0);        ShowCursor(FALSE);    }    if (hRC){        if (!wglMakeCurrent(NULL, NULL))            MessageBox(NULL, "释放DC 或 RC 失败", "错误", MB_OK);        if (!wglDeleteContext(hRC))            MessageBox(NULL, "释放RC失败", "错误", MB_OK);        hRC = NULL;    }    // ReleaseDC 失败返回0， 成功返回非0    if (hDC && !ReleaseDC(hWnd, hDC)){        MessageBox(NULL, "释放DC失败", "错误", MB_OK);        hDC = NULL;    }    if (hWnd && !DestroyWindow(hWnd)){        MessageBox(NULL, "销毁窗口失败", "错误", MB_OK);        hWnd = NULL;    }    if (!UnregisterClass("opengl", hInstance)){        MessageBox(NULL, "反注册失败", "错误", MB_OK);        hInstance = NULL;    }}BOOL CreateGLWindow(char* title, int width, int height, int bits, HINSTANCE hInstance, bool fullscreenflag){    GLuint PixelFormat;    WNDCLASS wc;    DWORD dwStyle;    DWORD dwExStyle;    RECT WindowRect;    WindowRect.left = (long)0;    WindowRect.right= (long)width;    WindowRect.top  =  (long)0;    WindowRect.bottom = (long)height;    fullscreen = fullscreenflag;    wc.hInstance = hInstance;    wc.cbClsExtra  = 0;    wc.cbWndExtra  = 0;    wc.style       = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;    wc.lpfnWndProc = WindowProc;    wc.hIcon = LoadIcon(NULL, IDI_WINLOGO);    wc.hCursor = LoadCursor(NULL, IDC_ARROW);    wc.hbrBackground = NULL;    wc.lpszClassName = "opengl";    wc.lpszMenuName = NULL;    // 注册窗口类    if (!RegisterClass(&wc)){        MessageBox(NULL, "窗口注册失败", "错误", MB_OK);        return FALSE;    }    if (fullscreen){        DEVMODE dmScreenSetting;        memset(&dmScreenSetting, 0, sizeof(dmScreenSetting));        dmScreenSetting.dmSize = sizeof(dmScreenSetting);        dmScreenSetting.dmBitsPerPel = bits;        dmScreenSetting.dmPelsHeight = height;        dmScreenSetting.dmPelsWidth = width;        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, "当前显卡不支持全屏操做\n使用窗口模式?", "错误", MB_YESNO|MB_ICONEXCLAMATION) == IDYES){                fullscreen = FALSE;            }            else{                MessageBox(NULL, "程序将会被关闭", "错误", MB_OK|MB_ICONEXCLAMATION);                return FALSE;            }        }    }    if (fullscreen){        dwExStyle = WS_EX_APPWINDOW;        dwStyle = WS_POPUP;        ShowCursor(FALSE);    }    else{        dwExStyle = WS_EX_APPWINDOW | WS_EX_WINDOWEDGE;        dwStyle = WS_OVERLAPPEDWINDOW;        //ShowCursor(TRUE);    }    dwStyle = dwStyle | WS_CLIPCHILDREN|WS_CLIPSIBLINGS;    AdjustWindowRectEx(&WindowRect, dwStyle, FALSE, dwExStyle);    if (!(hWnd = CreateWindowEx(dwExStyle, "opengl", title, 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);        return FALSE;    }    static PIXELFORMATDESCRIPTOR pfd = {        sizeof(PIXELFORMATDESCRIPTOR),        1,        PFD_DRAW_TO_WINDOW|        PFD_SUPPORT_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, "不能创建一个相匹配的像素模式", "错误", MB_OK|MB_ICONEXCLAMATION);        return FALSE;    }    if (!(PixelFormat = ChoosePixelFormat(hDC, &pfd))){        KillGLWindow();        MessageBox(NULL, "不能设置像素格式", "错误", MB_OK|MB_ICONEXCLAMATION);        return FALSE;    }    if (!SetPixelFormat(hDC, PixelFormat, &pfd)){        KillGLWindow();        MessageBox(NULL, "不能设置像素格式", "错误",MB_OK|MB_ICONEXCLAMATION);        return FALSE;    }    if (!(hRC = wglCreateContext(hDC))){        KillGLWindow();        MessageBox(NULL, "不能创建当前的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);        return FALSE;    }    ShowWindow(hWnd, SW_SHOW);    // 激活窗口    SetForegroundWindow(hWnd);    // 接收键盘信息    SetFocus(hWnd);    ReSizeGLScene(width, height);    InitGL();    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_CLOSE:        {            PostQuitMessage(0);            return 0;        }    case WM_KEYUP:        {            keys[wParam] = FALSE;            return 0;        }    case WM_KEYDOWN:        {            keys[wParam] = TRUE;            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;    if (MessageBox(NULL, "是否在全屏模式下运行?", "提示", MB_YESNO|MB_ICONEXCLAMATION) == IDYES)        fullscreen = TRUE;    if (!CreateGLWindow("Lesson 3", 640, 480, 16, hInstance, 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        {            if (active)            {                if (keys[VK_ESCAPE])                    done = TRUE;                else{                    DrawGLScene();                    SwapBuffers(hDC);                }                if (keys[VK_F1]){                    keys[VK_F1] = FALSE;                    KillGLWindow();                    fullscreen = !fullscreen;                    if (!CreateGLWindow("Lesson 3", 640, 480, 16, hInstance, fullscreen))                        return 0;                }            }        }    }    KillGLWindow();    return (msg.wParam);}
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