OpenGL多窗口显示问题

OpenGL程序中,如果使用了VBO技术,则不能使用wglMakeCurrent在多个窗口中切换。

测试程序不使用VBO技术,直接画出球体

第二个窗口

 

使用了VBO的程序,可以使用多线程技术在多个窗口中切换。

如下图如示

 

程序主要代码如下

int DrawGLScene(GLfloat& rtri, int speed){glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);glLoadIdentity();glTranslatef(-1.5f,0.0f,-10.0f);glRotatef(rtri,0.5f,1.0f,1.0f);rtri+=speed;glColor3f(0,255,0);glBegin(GL_LINES);glVertex3f(-1,-1,-1);glVertex3f(2,2,2);glEnd();void draw3();draw3();return TRUE;}GLuint cubeName[2];bool InitCubeVBO(){glGenBuffersARB(2, cubeName);glBindBufferARB(GL_ARRAY_BUFFER_ARB, cubeName[0] );glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(vertices) + sizeof(normals), 0, GL_STREAM_DRAW_ARB);glBufferSubDataARB(GL_ARRAY_BUFFER_ARB, 0, sizeof(vertices), vertices);glBufferSubDataARB(GL_ARRAY_BUFFER_ARB,sizeof(vertices), sizeof(normals), normals);glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, cubeName[1] );glBufferDataARB(GL_ELEMENT_ARRAY_BUFFER_ARB, sizeof(indices),indices, GL_STATIC_DRAW_ARB);return true;}void draw3(){glBindBufferARB(GL_ARRAY_BUFFER_ARB, cubeName[0] );glNormalPointer(GL_FLOAT, 0, (void *) sizeof(vertices));glVertexPointer(3, GL_FLOAT,0,0);glBindBufferARB( GL_ELEMENT_ARRAY_BUFFER_ARB, cubeName[1] ); glIndexPointer(GL_UNSIGNED_SHORT, 0, 0);glEnableClientState(GL_NORMAL_ARRAY);glEnableClientState(GL_VERTEX_ARRAY);glDrawElements(GL_QUADS, 24, GL_UNSIGNED_BYTE, 0);glDisableClientState(GL_VERTEX_ARRAY);glDisableClientState(GL_NORMAL_ARRAY);}BOOL CreateGLWindow(char* title, int width, int height, int bits, bool fullscreenflag, Res & res){GLuintPixelFormat;WNDCLASSwc;DWORDdwExStyle;DWORDdwStyle;RECTWindowRect;WindowRect.left=(long)0;WindowRect.right=(long)width;WindowRect.top=(long)0;WindowRect.bottom=(long)height;fullscreen=fullscreenflag;res.hInstance= GetModuleHandle(NULL);wc.style= CS_HREDRAW | CS_VREDRAW | CS_OWNDC;wc.lpfnWndProc= (WNDPROC) WndProc;wc.cbClsExtra= 0;wc.cbWndExtra= 0;wc.hInstance= res.hInstance;wc.hIcon= LoadIcon(NULL, IDI_WINLOGO);wc.hCursor= LoadCursor(NULL, IDC_ARROW);wc.hbrBackground= NULL;wc.lpszMenuName= NULL;wc.lpszClassName= "OpenGL";if (!RegisterClass(&wc)){}fullscreen = false;dwExStyle=WS_EX_APPWINDOW | WS_EX_WINDOWEDGE;dwStyle=WS_OVERLAPPEDWINDOW;AdjustWindowRectEx(&WindowRect, dwStyle, FALSE, dwExStyle);// Create The Windowif (!(res.hWnd=CreateWindowEx(dwExStyle,"OpenGL",title,dwStyle |// Defined Window StyleWS_CLIPSIBLINGS |// Required Window StyleWS_CLIPCHILDREN,// Required Window Style0, 0,WindowRect.right-WindowRect.left,WindowRect.bottom-WindowRect.top,NULL,NULL,res.hInstance,NULL))){KillGLWindow(res);MessageBox(NULL,"Window Creation Error.","ERROR",MB_OK|MB_ICONEXCLAMATION);return FALSE;}staticPIXELFORMATDESCRIPTOR pfd={sizeof(PIXELFORMATDESCRIPTOR),1,PFD_DRAW_TO_WINDOW |PFD_SUPPORT_OPENGL |PFD_DOUBLEBUFFER,PFD_TYPE_RGBA,bits,0, 0, 0, 0, 0, 0,0,0,0,0, 0, 0, 0,16,0,0,PFD_MAIN_PLANE,0,0, 0, 0};if (!(res.hDC=GetDC(res.hWnd))){KillGLWindow(res);MessageBox(NULL,"Can't Create A GL Device Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);return FALSE;}if (!(PixelFormat=ChoosePixelFormat(res.hDC,&pfd))){KillGLWindow(res);MessageBox(NULL,"Can't Find A Suitable PixelFormat.","ERROR",MB_OK|MB_ICONEXCLAMATION);return FALSE;}if(!SetPixelFormat(res.hDC,PixelFormat,&pfd)){KillGLWindow(res);MessageBox(NULL,"Can't Set The PixelFormat.","ERROR",MB_OK|MB_ICONEXCLAMATION);return FALSE;}if (!(res.hRC=wglCreateContext(res.hDC))){KillGLWindow(res);MessageBox(NULL,"Can't Create A GL Rendering Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);return FALSE;}if(!wglMakeCurrent(res.hDC,res.hRC)){KillGLWindow(res);MessageBox(NULL,"Can't Activate The GL Rendering Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);return FALSE;}ShowWindow(res.hWnd,SW_SHOW);SetForegroundWindow(res.hWnd);SetFocus(res.hWnd);ReSizeGLScene(width, height);if (!InitGL()){KillGLWindow(res);MessageBox(NULL,"Initialization Failed.","ERROR",MB_OK|MB_ICONEXCLAMATION);return FALSE;}return TRUE;}int WINAPI WinMain(HINSTANCEhInstance, HINSTANCEhPrevInstance, LPSTRlpCmdLine, intnCmdShow){if (MessageBox(NULL,"Would You Like To Run In Fullscreen Mode?", "Start FullScreen?",MB_YESNO|MB_ICONQUESTION)==IDNO){fullscreen=FALSE;}HasSpeedUp = false;void ThreadFunc();HANDLE hThrd = CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)ThreadFunc,NULL,0,NULL);CloseHandle(hThrd);Sleep(100);ThreadFunc();return 0;}void ThreadFunc(){Res res;res.hDC = NULL;res.hInstance = NULL;res.hRC = NULL;res.hWnd =NULL;res.rtri=0;int speed = 1;if (!HasSpeedUp){speed = 6;HasSpeedUp = true;}BOOLdone=FALSE;MSGmsg;if (!CreateGLWindow("NeHe's Solid Object Tutorial",640,480,16,fullscreen, res)){return ;}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 && !DrawGLScene(res.rtri, speed)) || keys[VK_ESCAPE]){done=TRUE;}else{SwapBuffers(res.hDC);}if (keys[VK_F1]){keys[VK_F1]=FALSE;KillGLWindow(res);fullscreen=!fullscreen;if (!CreateGLWindow("NeHe's Solid Object Tutorial",640,480,16,fullscreen, res)){return ;}}}}KillGLWindow(res);}

 

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