初始化glew，创建OpenGL渲染上下文
1 void RegisterWinDowClass(HINSTANCE hInstance,std::string className,WNDPROC proc)
2 {
3 WNDCLASS wndClass;
4 wndClass.cbClsExtra = 0;
5 wndClass.cbWndExtra = 0;
6 wndClass.hbrBackground = (HBRUSH)::GetStockObject(GRAY_BRUSH);
7 wndClass.hCursor = ::LoadCursor(NULL,IDC_ARROW);
8 wndClass.hIcon = ::LoadIcon(NULL,IDI_APPLICATION);
9 wndClass.hInstance = hInstance;
10 wndClass.lpfnWndProc = proc;
11 wndClass.lpszClassName = className.c_str();
12 wndClass.lpszMenuName = NULL;
13 wndClass.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC | CS_DBLCLKS;
14 ::RegisterClass(&wndClass);
15 }
1 bool InitGlewLib(HINSTANCE hInstance)
2 {
3 RegisterWinDowClass(hInstance,"Fake",MainWinProc);
4
5 HWND hWnd = ::CreateWindow("Fake","OpenGL",WS_OVERLAPPEDWINDOW,
6 CW_USEDEFAULT,CW_USEDEFAULT,width,heigtht,
7 NULL,NULL,hInstance,NULL);
8
9 HDC hDC = ::GetDC(hWnd);
10 HGLRC hRc;
11 ::PIXELFORMATDESCRIPTOR pfd;
12 //memset(&pfd,0,sizeof(pfd));
13
14 //pfd.nVersion = 1;
15 //pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
16 //pfd.dwFlags = PFD_DOUBLEBUFFER | PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW;
17 //pfd.iPixelType = PFD_TYPE_RGBA;
18 //pfd.cColorBits = 32;
19 //pfd.cDepthBits = 32;
20 //pfd.iLayerType = PFD_MAIN_PLANE;
21
22 //int iPixelFormat = ::ChoosePixelFormat(hDC,&pfd);
23 //if (iPixelFormat == 0)
24 //{
25 // DestroyWindow(hWnd);
26 // return false;
27 //}
28 /**************************************************************************
29
30 1，注册fake窗口的class，如果和主窗口是同名的class，会使初始化失败
31 2，选择1号格式索引作为临时索引
32 3，根据设备上下文创建渲染上下文
33 4，绑定到当前上下文
34 5，初始化glew
35 6，解除上下文绑定，销毁窗口
36 **************************************************************************/
37
38 int iPixelFormat = 1;
39 if (::SetPixelFormat(hDC,iPixelFormat,&pfd))
40 {
41 hRc = ::wglCreateContext(hDC);
42 if (::wglMakeCurrent(hDC,hRc))
43 {
44 GLenum retVal = glewInit();
45 wglMakeCurrent(NULL,NULL);
46 wglDeleteContext(hRc);
47 DestroyWindow(hWnd);
48 return retVal == GLEW_OK;
49 }
50 wglDeleteContext(hRc);
51 DestroyWindow(hWnd);
52 }
53 else
54 {
55 DestroyWindow(hWnd);
56 }
57
58 return false;
59 }
1 bool InitOpenGL(HWND hWnd,HINSTANCE hInstance)
2 {
3 if (!InitGlewLib(hInstance))
4 {
5 ::MessageBox(NULL,"glew init Error",NULL,MB_OK);
6 return 0;
7 }
8
9 if(!WGLEW_ARB_create_context || !WGLEW_ARB_pixel_format)
10 return false;
11 HDC hDC = ::GetDC(hWnd);
12 PIXELFORMATDESCRIPTOR pfd;
13 //memset(&pfd, 0, sizeof(PIXELFORMATDESCRIPTOR));
14 //pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
15 //pfd.nVersion = 1;
16 //pfd.dwFlags = PFD_DOUBLEBUFFER | PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW;
17 //pfd.iPixelType = PFD_TYPE_RGBA;
18 //pfd.cColorBits = 32;
19 //pfd.cDepthBits = 32;
20 //pfd.iLayerType = PFD_MAIN_PLANE;
21
22 /**************************************************************************
23
24 1，填充像素格式属性 （缓冲区的初始化）
25 2，填充上下文属性 （用于设置指定OpenGL版本）
26 3，根据像素格式属性选择设备上下文合适像素格式索引。wglChoosePixelFormatARB(...)
27 4，将得到的像素格式索引绑定到设备上下文。SetPixelFormat(...)
28 5，根据设备上下文，及上下文属性设置创建一个OpenGL渲染上下文。wglCreateContextAttribsARB(...)
29 6，将渲染上下文与设备上下文绑定 wglMakeCurrent(...)
30
31 **************************************************************************/
32
33 const int iPixelFormatAttributeList[] =
34 {
35 WGL_DRAW_TO_WINDOW_ARB, GL_TRUE, // 绘制到窗口
36 WGL_SUPPORT_OPENGL_ARB,GL_TRUE, // 支持OpenGL
37 WGL_ACCELERATION_ARB ,WGL_FULL_ACCELERATION_ARB , // 硬件加速
38 WGL_DOUBLE_BUFFER_ARB,GL_TRUE, // 双缓冲
39 WGL_PIXEL_TYPE_ARB,WGL_TYPE_RGBA_ARB, // RGBA
40 WGL_COLOR_BITS_ARB,32, // 颜色位数32
41 WGL_DEPTH_BITS_ARB,24, // 深度位数24
42 WGL_STENCIL_BITS_ARB,8, // 模板位数8
43 WGL_SWAP_METHOD_ARB, WGL_SWAP_EXCHANGE_ARB, // 双缓冲swap方式直接交换
44 WGL_SAMPLES_ARB, 4, // 4倍抗锯齿
45 0
46 };
47
48 const int iContextAttributeList[] =
49 {
50 WGL_CONTEXT_MAJOR_VERSION_ARB,3, // 主版本号
51 WGL_CONTEXT_MINOR_VERSION_ARB,3, // 次版本号
52 WGL_CONTEXT_FLAGS_ARB,WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
53 0
54 };
55
56 int iPixelFormat,iNumFormat;
57 wglChoosePixelFormatARB(hDC,iPixelFormatAttributeList,NULL,
58 1,&iPixelFormat,(UINT *)&iNumFormat);
59
60 if (!SetPixelFormat(hDC,iPixelFormat,&pfd))
61 {
62 //int error = ::GetLastError();
63 return false;
64 }
65 HGLRC hRC = wglCreateContextAttribsARB(hDC,NULL,iContextAttributeList);
66 if (hRC)
67 {
68 ::wglMakeCurrent(hDC,hRC);
69 return true;
70 }
71 return false;
72 }
