学步园

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

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