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#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);
}
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