Na początku zadeklarujmy zmienne których użyjemy:
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static HDC hDC; static HGLRC hRC; static HWND hstat; |
W kodzie dla zdarzenia WM_CREATE należy wpisać:
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hstat=CreateWindow("static","",WS_CHILD|WS_VISIBLE, 10,10,200,200,hWnd,(HMENU)666,GetModuleHandle(NULL),NULL); |
by stworzyć obiekt.
Potem normalnie inicjujemy OpenGL’a, tyle, że kontekst graficzny przypisujemy dla hstat, o taki kod był w szablonie, tylko dół dodałem:
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void EnableOpenGL (HWND hWnd, HDC *hDC, HGLRC *hRC) { PIXELFORMATDESCRIPTOR pfd; int iFormat; /* get the device context (DC) */ *hDC = GetDC (hWnd); /* set the pixel format for the DC */ ZeroMemory (&pfd, sizeof (pfd)); pfd.nSize = sizeof (pfd); pfd.nVersion = 1; pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER; pfd.iPixelType = PFD_TYPE_RGBA; pfd.cColorBits = 32; pfd.cDepthBits = 16; pfd.iLayerType = PFD_MAIN_PLANE; iFormat = ChoosePixelFormat (*hDC, &pfd); SetPixelFormat (*hDC, iFormat, &pfd); /* create and enable the render context (RC) */ *hRC = wglCreateContext( *hDC ); wglMakeCurrent( *hDC, *hRC ); //tutaj może być dowolne ustawienie rzutowania, ale wybrałem takie glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(0,200,200,0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } |
Użyjemy tej funkcji z procedurze okienkowej po pokazaniu się okna, czyli po funkcji ShowWindow w taki sposób:
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EnableOpenGL (hstat, &hDC, &hRC); |
Przed zakończeniem programu (w WM_DESTROY przed funkcją PostQuitMessage(0)) użyjemy takiej funkcji:
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void DisableOpenGL (HWND hWnd, HDC hDC, HGLRC hRC) { wglMakeCurrent (NULL, NULL); wglDeleteContext (hRC); ReleaseDC (hWnd, hDC); } |
No i jeszcze ostatecznie coś narysujmy na naszym staticu
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int DrawGLScene(GLvoid) { glLoadIdentity(); glClearColor (0.0f, 0.0f, 0.0f, 0.0f); glClear (GL_COLOR_BUFFER_BIT); glBegin(GL_QUADS); glColor3f(0.2,0.8,0.4);glVertex2f(15,15); glColor3f(0.8,0.2,1);glVertex2f(90,15); glColor3f(0.9,0.1,1);glVertex2f(90,100); glColor3f(0.4,1,0.9);glVertex2f(15,100); glEnd(); } |
Użyjemy to w ten sposób:
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while( msg.message!=WM_QUIT ) { if( PeekMessage( &msg, NULL, 0U, 0U, PM_REMOVE ) ) { TranslateMessage( &msg ); DispatchMessage( &msg ); } else { DrawGLScene(); SwapBuffers(hDC); } } |
W razie watpliwości, przejrzyj kod przykładowy:
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#include #include #include /* Declare Windows procedure */ HWND hwnd; LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM); int DrawGLScene(GLvoid); void EnableOpenGL (HWND hWnd, HDC *hDC, HGLRC *hRC); void DisableOpenGL (HWND hWnd, HDC hDC, HGLRC hRC); static HDC hDC; static HGLRC hRC; static HWND hstat; /* Make the class name into a global variable */ char szClassName[ ] = "CodeBlocksWindowsApp"; int WINAPI WinMain (HINSTANCE hThisInstance, HINSTANCE hPrevInstance, LPSTR lpszArgument, int nFunsterStil) { HWND hWnd; /* This is the handle for our window */ MSG msg; /* Here messages to the application are saved */ WNDCLASSEX wincl; /* Data structure for the windowclass */ /* The Window structure */ wincl.hInstance = hThisInstance; wincl.lpszClassName = szClassName; wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */ wincl.style = CS_DBLCLKS; /* Catch double-clicks */ wincl.cbSize = sizeof (WNDCLASSEX); /* Use default icon and mouse-pointer */ wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION); wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION); wincl.hCursor = LoadCursor (NULL, IDC_ARROW); wincl.lpszMenuName = NULL; /* No menu */ wincl.cbClsExtra = 0; /* No extra bytes after the window class */ wincl.cbWndExtra = 0; /* structure or the window instance */ /* Use Windows's default color as the background of the window */ wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND; /* Register the window class, and if it fails quit the program */ if (!RegisterClassEx (&wincl)) return 0; /* The class is registered, let's create the program*/ hWnd = CreateWindowEx ( 0, /* Extended possibilites for variation */ szClassName, /* Classname */ "Code::Blocks Template Windows App", /* Title Text */ WS_OVERLAPPEDWINDOW, /* default window */ CW_USEDEFAULT, /* Windows decides the position */ CW_USEDEFAULT, /* where the window ends up on the screen */ 544, /* The programs width */ 375, /* and height in pixels */ HWND_DESKTOP, /* The window is a child-window to desktop */ NULL, /* No menu */ hThisInstance, /* Program Instance handler */ NULL /* No Window Creation data */ ); /* Make the window visible on the screen */ ShowWindow (hWnd, nFunsterStil); hwnd=hWnd; EnableOpenGL (hstat, &hDC, &hRC); /* Run the message loop. It will run until GetMessage() returns 0 */ while( msg.message!=WM_QUIT ) { if( PeekMessage( &msg, NULL, 0U, 0U, PM_REMOVE ) ) { TranslateMessage( &msg ); DispatchMessage( &msg ); } else { DrawGLScene(); SwapBuffers(hDC); } } /* The program return-value is 0 - The value that PostQuitMessage() gave */ return msg.wParam; } /* This function is called by the Windows function DispatchMessage() */ LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { switch (message) /* handle the messages */ { case WM_CREATE: hstat=CreateWindow("static","",WS_CHILD|WS_VISIBLE, 10,10,200,200,hwnd,(HMENU)666,GetModuleHandle(NULL),NULL); break; case WM_DESTROY: DisableOpenGL(hstat,hDC,hRC); PostQuitMessage (0); /* send a WM_QUIT to the message queue */ break; default: /* for messages that we don't deal with */ return DefWindowProc (hwnd, message, wParam, lParam); } return 0; } int DrawGLScene(GLvoid) { glLoadIdentity(); glClearColor (0.0f, 0.0f, 0.0f, 0.0f); glClear (GL_COLOR_BUFFER_BIT); glBegin(GL_QUADS); glColor3f(0.2,0.8,0.4);glVertex2f(15,15); glColor3f(0.8,0.2,1);glVertex2f(90,15); glColor3f(0.9,0.1,1);glVertex2f(90,100); glColor3f(0.4,1,0.9);glVertex2f(15,100); glEnd(); } void EnableOpenGL (HWND hWnd, HDC *hDC, HGLRC *hRC) { PIXELFORMATDESCRIPTOR pfd; int iFormat; /* get the device context (DC) */ *hDC = GetDC (hWnd); /* set the pixel format for the DC */ ZeroMemory (&pfd, sizeof (pfd)); pfd.nSize = sizeof (pfd); pfd.nVersion = 1; pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER; pfd.iPixelType = PFD_TYPE_RGBA; pfd.cColorBits = 32; pfd.cDepthBits = 16; pfd.iLayerType = PFD_MAIN_PLANE; iFormat = ChoosePixelFormat (*hDC, &pfd); SetPixelFormat (*hDC, iFormat, &pfd); /* create and enable the render context (RC) */ *hRC = wglCreateContext( *hDC ); wglMakeCurrent( *hDC, *hRC ); //tutaj może być dowolne ustawienie rzutowania, ale wybrałem takie glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(0,200,200,0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } void DisableOpenGL (HWND hWnd, HDC hDC, HGLRC hRC) { wglMakeCurrent (NULL, NULL); wglDeleteContext (hRC); ReleaseDC (hWnd, hDC); } |
należy nie zapomnieć o podlinkowaniu libów opengl32 i glu32.
Autor: Spine