#include <stdio.h> LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); ATOM oglClass = 0; HWND CreateDummyWindow( int x, int y, int width, int height ) { RECT rect; HINSTANCE hInstance; DWORD dwExStyle; DWORD dwStyle; HWND hWnd; ZeroMemory( &rect, sizeof( rect ) ); // I don't know if we need this but it can't hurt if( width < 0 ) { rect.left = x + width; rect.right = x; } else { rect.left = x; rect.right = x + width; } if( height < 0 ) { rect.top = y + height; rect.bottom = y; } else { rect.top = y; rect.bottom = y + height; } hInstance = GetModuleHandle(NULL); if( !oglClass ) { WNDCLASS wc; ZeroMemory( &wc, sizeof( wc ) ); wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC; wc.lpfnWndProc = (WNDPROC) WndProc; wc.cbClsExtra = 0; wc.cbWndExtra = 0; wc.hInstance = hInstance; wc.hIcon = NULL; wc.hCursor = NULL; wc.hbrBackground = NULL; wc.lpszMenuName = NULL; wc.lpszClassName = "OpenGL"; if( !(oglClass = RegisterClass( &wc )) ) { printf( "RegisterClass Failed: %d\n", GetLastError() ); return( 0 ); } } dwExStyle = WS_EX_APPWINDOW | WS_EX_WINDOWEDGE; dwStyle = WS_OVERLAPPEDWINDOW; if( !(hWnd=CreateWindowEx( dwExStyle, "OpenGL", "OpenGL", dwStyle | WS_CLIPSIBLINGS | WS_CLIPCHILDREN, rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, NULL, NULL, hInstance, NULL ) ) ) { return( 0 ); } return( hWnd ); } void NativeEventLoop() { MSG msg; BOOL ret; // Grab windows system messages from queue while( ( ret = GetMessage( &msg, NULL, 0, 0 ) ) != 0 ) { if( ret == -1 ) { printf( "Error GetMessage: %d", GetLastError() ); } else { DispatchMessage( &msg ); } } } void DestroyDummyWindow(HWND handle, HDC hdc) { // Post a close window message from shutdown hook thread to // window message pump thread if( !PostMessage( handle, WM_CLOSE, 0, (LPARAM) hdc ) ) { printf( "PostMessage Failed: %d\n", GetLastError() ); } } LRESULT CALLBACK WndProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) { switch( uMsg ) { case WM_CLOSE: // Destroy HDC if( ReleaseDC( hWnd, (HDC) lParam ) != 1 ) { printf( "Error Releasing DC: %d\n", GetLastError() ); } // Destroy HWND if( DestroyWindow( hWnd ) == 0 ) { printf( "Error Destroying Window: %d\n", GetLastError() ); } break; case WM_DESTROY: // Terminate Dummy Window PostQuitMessage(0); return(0); } return DefWindowProc(hWnd,uMsg,wParam,lParam); }