The Program Ported to Win32
The following program is a Win32 OpenGL program with the same OpenGL code used in the AUXDEMO.C sample program supplied with the Microsoft Platform SDK. Compare this program with the X Window System OpenGL program in An X Window System OpenGL Program.
/* * Example of a Win32 OpenGL program. * The OpenGL code is the same as that used in * the X Window System sample */ #include <windows.h> #include <GL/gl.h> #include <GL/glu.h> /* Windows globals, defines, and prototypes */ CHAR szAppName[]="Win OpenGL"; HWND ghWnd; HDC ghDC; HGLRC ghRC; #define SWAPBUFFERS SwapBuffers(ghDC) #define BLACK_INDEX 0 #define RED_INDEX 13 #define GREEN_INDEX 14 #define BLUE_INDEX 16 #define WIDTH 300 #define HEIGHT 200 LONG WINAPI MainWndProc (HWND, UINT, WPARAM, LPARAM); BOOL bSetupPixelFormat(HDC); /* OpenGL globals, defines, and prototypes */ GLfloat latitude, longitude, latinc, longinc; GLdouble radius; #define GLOBE 1 #define CYLINDER 2 #define CONE 3 GLvoid resize(GLsizei, GLsizei); GLvoid initializeGL(GLsizei, GLsizei); GLvoid drawScene(GLvoid); void polarView( GLdouble, GLdouble, GLdouble, GLdouble); int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { MSG msg; WNDCLASS wndclass; /* Register the frame class */ wndclass.style = 0; wndclass.lpfnWndProc = (WNDPROC)MainWndProc; wndclass.cbClsExtra = 0; wndclass.cbWndExtra = 0; wndclass.hInstance = hInstance; wndclass.hIcon = LoadIcon (hInstance, szAppName); wndclass.hCursor = LoadCursor (NULL,IDC_ARROW); wndclass.hbrBackground = (HBRUSH)(COLOR_WINDOW+1); wndclass.lpszMenuName = szAppName; wndclass.lpszClassName = szAppName; if (!RegisterClass (&wndclass) ) return FALSE; /* Create the frame */ ghWnd = CreateWindow (szAppName, "Generic OpenGL Sample", WS_OVERLAPPEDWINDOW | WS_CLIPSIBLINGS | WS_CLIPCHILDREN, CW_USEDEFAULT, CW_USEDEFAULT, WIDTH, HEIGHT, NULL, NULL, hInstance, NULL); /* make sure window was created */ if (!ghWnd) return FALSE; /* show and update main window */ ShowWindow (ghWnd, nCmdShow); UpdateWindow (ghWnd); /* animation loop */ while (1) { /* * Process all pending messages */ while (PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE) == TRUE) { if (GetMessage(&msg, NULL, 0, 0) ) { TranslateMessage(&msg); DispatchMessage(&msg); } else { return TRUE; } } drawScene(); } } /* main window procedure */ LONG WINAPI MainWndProc ( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) { LONG lRet = 1; PAINTSTRUCT ps; RECT rect; switch (uMsg) { case WM_CREATE: ghDC = GetDC(hWnd); if (!bSetupPixelFormat(ghDC)) PostQuitMessage (0); ghRC = wglCreateContext(ghDC); wglMakeCurrent(ghDC, ghRC); GetClientRect(hWnd, &rect); initializeGL(rect.right, rect.bottom); break; case WM_PAINT: BeginPaint(hWnd, &ps); EndPaint(hWnd, &ps); break; case WM_SIZE: GetClientRect(hWnd, &rect); resize(rect.right, rect.bottom); break; case WM_CLOSE: if (ghRC) wglDeleteContext(ghRC); if (ghDC) ReleaseDC(hWnd, ghDC); ghRC = 0; ghDC = 0; DestroyWindow (hWnd); break; case WM_DESTROY: if (ghRC) wglDeleteContext(ghRC); if (ghDC) ReleaseDC(hWnd, ghDC); PostQuitMessage (0); break; case WM_KEYDOWN: switch (wParam) { case VK_LEFT: longinc += 0.5F; break; case VK_RIGHT: longinc -= 0.5F; break; case VK_UP: latinc += 0.5F; break; case VK_DOWN: latinc -= 0.5F; break; } default: lRet = DefWindowProc (hWnd, uMsg, wParam, lParam); break; } return lRet; } BOOL bSetupPixelFormat(HDC hdc) { PIXELFORMATDESCRIPTOR pfd, *ppfd; int pixelformat; ppfd = &pfd; ppfd->nSize = sizeof(PIXELFORMATDESCRIPTOR); ppfd->nVersion = 1; ppfd->dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER; ppfd->dwLayerMask = PFD_MAIN_PLANE; ppfd->iPixelType = PFD_TYPE_COLORINDEX; ppfd->cColorBits = 8; ppfd->cDepthBits = 16; ppfd->cAccumBits = 0; ppfd->cStencilBits = 0; pixelformat = ChoosePixelFormat(hdc, ppfd); if ( (pixelformat = ChoosePixelFormat(hdc, ppfd)) == 0 ) { MessageBox(NULL, "ChoosePixelFormat failed", "Error", MB_OK); return FALSE; } if (SetPixelFormat(hdc, pixelformat, ppfd) == FALSE) { MessageBox(NULL, "SetPixelFormat failed", "Error", MB_OK); return FALSE; } return TRUE; } /* OpenGL code */ GLvoid resize( GLsizei width, GLsizei height ) { GLfloat aspect; glViewport( 0, 0, width, height ); aspect = (GLfloat) width / height; glMatrixMode( GL_PROJECTION ); glLoadIdentity(); gluPerspective( 45.0, aspect, 3.0, 7.0 ); glMatrixMode( GL_MODELVIEW ); } GLvoid createObjects() { GLUquadricObj *quadObj; glNewList(GLOBE, GL_COMPILE); quadObj = gluNewQuadric (); gluQuadricDrawStyle (quadObj, GLU_LINE); gluSphere (quadObj, 1.5, 16, 16); glEndList(); glNewList(CONE, GL_COMPILE); quadObj = gluNewQuadric (); gluQuadricDrawStyle (quadObj, GLU_FILL); gluQuadricNormals (quadObj, GLU_SMOOTH); gluCylinder(quadObj, 0.3, 0.0, 0.6, 15, 10); glEndList(); glNewList(CYLINDER, GL_COMPILE); glPushMatrix (); glRotatef ((GLfloat)90.0, (GLfloat)1.0, (GLfloat)0.0, (GLfloat)0.0); glTranslatef ((GLfloat)0.0, (GLfloat)0.0, (GLfloat)-1.0); quadObj = gluNewQuadric (); gluQuadricDrawStyle (quadObj, GLU_FILL); gluQuadricNormals (quadObj, GLU_SMOOTH); gluCylinder (quadObj, 0.3, 0.3, 0.6, 12, 2); glPopMatrix (); glEndList(); } GLvoid initializeGL(GLsizei width, GLsizei height) { GLfloat maxObjectSize, aspect; GLdouble near_plane, far_plane; glClearIndex( (GLfloat)BLACK_INDEX); glClearDepth( 1.0 ); glEnable(GL_DEPTH_TEST); glMatrixMode( GL_PROJECTION ); aspect = (GLfloat) width / height; gluPerspective( 45.0, aspect, 3.0, 7.0 ); glMatrixMode( GL_MODELVIEW ); near_plane = 3.0; far_plane = 7.0; maxObjectSize = 3.0F; radius = near_plane + maxObjectSize/2.0; latitude = 0.0F; longitude = 0.0F; latinc = 6.0F; longinc = 2.5F; createObjects(); } void polarView(GLdouble radius, GLdouble twist, GLdouble latitude, GLdouble longitude) { glTranslated(0.0, 0.0, -radius); glRotated(-twist, 0.0, 0.0, 1.0); glRotated(-latitude, 1.0, 0.0, 0.0); glRotated(longitude, 0.0, 0.0, 1.0); } GLvoid drawScene(GLvoid) { glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); glPushMatrix(); latitude += latinc; longitude += longinc; polarView( radius, 0, latitude, longitude ); glIndexi(RED_INDEX); glCallList(CONE); glIndexi(BLUE_INDEX); glCallList(GLOBE); glIndexi(GREEN_INDEX); glPushMatrix(); glTranslatef(0.8F, -0.65F, 0.0F); glRotatef(30.0F, 1.0F, 0.5F, 1.0F); glCallList(CYLINDER); glPopMatrix(); glPopMatrix(); SWAPBUFFERS; }