//----------------------------------------------------------------------------- // File: WindowedMode.cpp // // Desc: This sample demonstrates how to use DirectDraw in windowed mode. // // Copyright (c) 1999-2001 Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- #define STRICT #include #include #include #include "resource.h" #include "ddutil.h" //----------------------------------------------------------------------------- // Defines, constants, and global variables //----------------------------------------------------------------------------- #define SAFE_DELETE(p) { if(p) { delete (p); (p)=NULL; } } #define SAFE_RELEASE(p) { if(p) { (p)->Release(); (p)=NULL; } } #define WINDOW_WIDTH 640 #define WINDOW_HEIGHT 480 #define SPRITE_DIAMETER 48 #define NUM_SPRITES 25 #define HELPTEXT TEXT("Press Escape to quit.") struct SPRITE_STRUCT { FLOAT fPosX; FLOAT fPosY; FLOAT fVelX; FLOAT fVelY; }; CDisplay* g_pDisplay = NULL; CSurface* g_pLogoSurface = NULL; CSurface* g_pTextSurface = NULL; RECT g_rcViewport; RECT g_rcScreen; BOOL g_bActive = FALSE; DWORD g_dwLastTick; SPRITE_STRUCT g_Sprite[NUM_SPRITES]; //----------------------------------------------------------------------------- // Function-prototypes //----------------------------------------------------------------------------- LRESULT CALLBACK MainWndProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam ); HRESULT WinInit( HINSTANCE hInst, int nCmdShow, HWND* phWnd, HACCEL* phAccel ); HRESULT InitDirectDraw( HWND hWnd ); VOID FreeDirectDraw(); HRESULT ProcessNextFrame( HWND hWnd ); VOID UpdateSprite( SPRITE_STRUCT* pSprite, FLOAT fTimeDelta ); HRESULT DisplayFrame(); HRESULT RestoreSurfaces(); //----------------------------------------------------------------------------- // Name: WinMain() // Desc: Entry point to the program. Initializes everything and calls // UpdateFrame() when idle from the message pump. //----------------------------------------------------------------------------- int APIENTRY WinMain( HINSTANCE hInst, HINSTANCE hPrevInst, LPSTR pCmdLine, int nCmdShow ) { MSG msg; HWND hWnd; HACCEL hAccel; ZeroMemory( &g_Sprite, sizeof(SPRITE_STRUCT) * NUM_SPRITES ); srand( GetTickCount() ); if( FAILED( WinInit( hInst, nCmdShow, &hWnd, &hAccel ) ) ) return FALSE; if( FAILED( InitDirectDraw( hWnd ) ) ) { MessageBox( hWnd, TEXT("DirectDraw init failed. ") TEXT("The sample will now exit. "), TEXT("DirectDraw Sample"), MB_ICONERROR | MB_OK ); return FALSE; } g_dwLastTick = timeGetTime(); while( TRUE ) { // Look for messages, if none are found then // update the state and display it if( PeekMessage( &msg, NULL, 0, 0, PM_NOREMOVE ) ) { if( 0 == GetMessage(&msg, NULL, 0, 0 ) ) { // WM_QUIT was posted, so exit return (int)msg.wParam; } // Translate and dispatch the message if( 0 == TranslateAccelerator( hWnd, hAccel, &msg ) ) { TranslateMessage( &msg ); DispatchMessage( &msg ); } } else { if( g_bActive ) { // Move the sprites, blt them to the back buffer, then // flip or blt the back buffer to the primary buffer if( FAILED( ProcessNextFrame( hWnd ) ) ) { SAFE_DELETE( g_pDisplay ); MessageBox( hWnd, TEXT("Displaying the next frame failed. ") TEXT("The sample will now exit. "), TEXT("DirectDraw Sample"), MB_ICONERROR | MB_OK ); return FALSE; } } else { // Make sure we go to sleep if we have nothing else to do WaitMessage(); // Ignore time spent inactive g_dwLastTick = timeGetTime(); } } } } //----------------------------------------------------------------------------- // Name: WinInit() // Desc: Init the window //----------------------------------------------------------------------------- HRESULT WinInit( HINSTANCE hInst, int nCmdShow, HWND* phWnd, HACCEL* phAccel ) { WNDCLASSEX wc; HWND hWnd; HACCEL hAccel; // Register the Window Class wc.cbSize = sizeof(wc); wc.lpszClassName = TEXT("WindowedMode"); wc.lpfnWndProc = MainWndProc; wc.style = CS_VREDRAW | CS_HREDRAW; wc.hInstance = hInst; wc.hIcon = LoadIcon( hInst, MAKEINTRESOURCE(IDI_MAIN) ); wc.hIconSm = LoadIcon( hInst, MAKEINTRESOURCE(IDI_MAIN) ); wc.hCursor = LoadCursor( NULL, IDC_ARROW ); wc.hbrBackground = (HBRUSH) (COLOR_WINDOW + 1); wc.lpszMenuName = MAKEINTRESOURCE(IDR_MENU); wc.cbClsExtra = 0; wc.cbWndExtra = 0; if( RegisterClassEx( &wc ) == 0 ) return E_FAIL; // Load keyboard accelerators hAccel = LoadAccelerators( hInst, MAKEINTRESOURCE(IDR_MAIN_ACCEL) ); // Calculate the proper size for the window given a client of 640x480 DWORD dwFrameWidth = GetSystemMetrics( SM_CXSIZEFRAME ); DWORD dwFrameHeight = GetSystemMetrics( SM_CYSIZEFRAME ); DWORD dwMenuHeight = GetSystemMetrics( SM_CYMENU ); DWORD dwCaptionHeight = GetSystemMetrics( SM_CYCAPTION ); DWORD dwWindowWidth = WINDOW_WIDTH + dwFrameWidth * 2; DWORD dwWindowHeight = WINDOW_HEIGHT + dwFrameHeight * 2 + dwMenuHeight + dwCaptionHeight; // Create and show the main window DWORD dwStyle = WS_OVERLAPPEDWINDOW & ~WS_MAXIMIZEBOX; hWnd = CreateWindowEx( 0, TEXT("WindowedMode"), TEXT("DirectDraw WindowedMode Sample"), dwStyle, CW_USEDEFAULT, CW_USEDEFAULT, dwWindowWidth, dwWindowHeight, NULL, NULL, hInst, NULL ); if( hWnd == NULL ) return E_FAIL; ShowWindow( hWnd, nCmdShow ); UpdateWindow( hWnd ); *phWnd = hWnd; *phAccel = hAccel; return S_OK; } //----------------------------------------------------------------------------- // Name: InitDirectDraw() // Desc: Create the DirectDraw object, and init the surfaces //----------------------------------------------------------------------------- HRESULT InitDirectDraw( HWND hWnd ) { LPDIRECTDRAWPALETTE pDDPal = NULL; HRESULT hr; int iSprite; g_pDisplay = new CDisplay(); if( FAILED( hr = g_pDisplay->CreateWindowedDisplay( hWnd, WINDOW_WIDTH, WINDOW_HEIGHT ) ) ) { MessageBox( hWnd, TEXT("Failed initializing DirectDraw."), TEXT("DirectDraw Sample"), MB_ICONERROR | MB_OK ); return hr; } // Create and set the palette when in palettized color if( FAILED( hr = g_pDisplay->CreatePaletteFromBitmap( &pDDPal, MAKEINTRESOURCE( IDB_DIRECTX ) ) ) ) return hr; g_pDisplay->SetPalette( pDDPal ); SAFE_RELEASE( pDDPal ); // Create a surface, and draw a bitmap resource on it. if( FAILED( hr = g_pDisplay->CreateSurfaceFromBitmap( &g_pLogoSurface, MAKEINTRESOURCE( IDB_DIRECTX ), SPRITE_DIAMETER, SPRITE_DIAMETER ) ) ) return hr; // Create a surface, and draw text to it. if( FAILED( hr = g_pDisplay->CreateSurfaceFromText( &g_pTextSurface, NULL, HELPTEXT, RGB(0,0,0), RGB(255, 255, 0) ) ) ) return hr; // Set the color key for the logo sprite to black if( FAILED( hr = g_pLogoSurface->SetColorKey( 0 ) ) ) return hr; // Init all the sprites. All of these sprites look the same, // using the g_pDDSLogo surface. for( iSprite = 0; iSprite < NUM_SPRITES; iSprite++ ) { // Set the sprite's position and velocity g_Sprite[iSprite].fPosX = (float) (rand() % WINDOW_WIDTH); g_Sprite[iSprite].fPosY = (float) (rand() % WINDOW_HEIGHT); g_Sprite[iSprite].fVelX = 500.0f * rand() / RAND_MAX - 250.0f; g_Sprite[iSprite].fVelY = 500.0f * rand() / RAND_MAX - 250.0f; } return S_OK; } //----------------------------------------------------------------------------- // Name: FreeDirectDraw() // Desc: Release all the DirectDraw objects //----------------------------------------------------------------------------- VOID FreeDirectDraw() { SAFE_DELETE( g_pLogoSurface ); SAFE_DELETE( g_pTextSurface ); SAFE_DELETE( g_pDisplay ); } //----------------------------------------------------------------------------- // Name: MainWndProc() // Desc: The main window procedure //----------------------------------------------------------------------------- LRESULT CALLBACK MainWndProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam ) { switch (msg) { case WM_COMMAND: switch( LOWORD(wParam) ) { case IDM_EXIT: // Received key/menu command to exit app PostMessage( hWnd, WM_CLOSE, 0, 0 ); return 0L; } break; // Continue with default processing case WM_PAINT: // Update the screen if we need to refresh. This case occurs // when in windowed mode and the window is behind others. // The app will not be active, but it will be visible. if( g_pDisplay ) { // Display the new position of the sprite if( DisplayFrame() == DDERR_SURFACELOST ) { // If the surfaces were lost, then restore and try again RestoreSurfaces(); DisplayFrame(); } } break; // Continue with default processing to validate the region case WM_QUERYNEWPALETTE: if( g_pDisplay ) { // If we are in windowed mode with a desktop resolution in 8 bit // color, then the palette we created during init has changed // since then. So get the palette back from the primary // DirectDraw surface, and set it again so that DirectDraw // realises the palette, then release it again. LPDIRECTDRAWPALETTE pDDPal = NULL; g_pDisplay->GetFrontBuffer()->GetPalette( &pDDPal ); g_pDisplay->GetFrontBuffer()->SetPalette( pDDPal ); SAFE_RELEASE( pDDPal ); } break; case WM_GETMINMAXINFO: { // Don't allow resizing in windowed mode. // Fix the size of the window to 640x480 (client size) MINMAXINFO* pMinMax = (MINMAXINFO*) lParam; DWORD dwFrameWidth = GetSystemMetrics( SM_CXSIZEFRAME ); DWORD dwFrameHeight = GetSystemMetrics( SM_CYSIZEFRAME ); DWORD dwMenuHeight = GetSystemMetrics( SM_CYMENU ); DWORD dwCaptionHeight = GetSystemMetrics( SM_CYCAPTION ); pMinMax->ptMinTrackSize.x = WINDOW_WIDTH + dwFrameWidth * 2; pMinMax->ptMinTrackSize.y = WINDOW_HEIGHT + dwFrameHeight * 2 + dwMenuHeight + dwCaptionHeight; pMinMax->ptMaxTrackSize.x = pMinMax->ptMinTrackSize.x; pMinMax->ptMaxTrackSize.y = pMinMax->ptMinTrackSize.y; } return 0L; case WM_MOVE: if( g_pDisplay ) g_pDisplay->UpdateBounds(); return 0L; case WM_EXITMENULOOP: // Ignore time spent in menu g_dwLastTick = timeGetTime(); break; case WM_EXITSIZEMOVE: // Ignore time spent resizing g_dwLastTick = timeGetTime(); break; case WM_SIZE: // Check to see if we are losing our window... if( SIZE_MAXHIDE==wParam || SIZE_MINIMIZED==wParam ) g_bActive = FALSE; else g_bActive = TRUE; if( g_pDisplay ) g_pDisplay->UpdateBounds(); break; case WM_DESTROY: // Cleanup and close the app FreeDirectDraw(); PostQuitMessage( 0 ); return 0L; } return DefWindowProc(hWnd, msg, wParam, lParam); } //----------------------------------------------------------------------------- // Name: ProcessNextFrame() // Desc: Move the sprites, blt them to the back buffer, then // flip or blt the back buffer to the primary buffer //----------------------------------------------------------------------------- HRESULT ProcessNextFrame( HWND hWnd ) { HRESULT hr; // Figure how much time has passed since the last time DWORD dwCurrTick = timeGetTime(); DWORD dwTickDiff = dwCurrTick - g_dwLastTick; // Don't update if no time has passed if( dwTickDiff == 0 ) return S_OK; g_dwLastTick = dwCurrTick; // Move the sprites according to how much time has passed for( int iSprite = 0; iSprite < NUM_SPRITES; iSprite++ ) UpdateSprite( &g_Sprite[ iSprite ], dwTickDiff / 1000.0f ); // Check the cooperative level before rendering if( FAILED( hr = g_pDisplay->GetDirectDraw()->TestCooperativeLevel() ) ) { switch( hr ) { case DDERR_EXCLUSIVEMODEALREADYSET: // Do nothing because some other app has exclusive mode Sleep(10); return S_OK; case DDERR_WRONGMODE: // The display mode changed on us. Update the // DirectDraw surfaces accordingly FreeDirectDraw(); return InitDirectDraw( hWnd ); } return hr; } // Display the sprites on the screen if( FAILED( hr = DisplayFrame() ) ) { if( hr != DDERR_SURFACELOST ) return hr; // The surfaces were lost so restore them RestoreSurfaces(); } return S_OK; } //----------------------------------------------------------------------------- // Name: UpdateSprite() // Desc: Move the sprite around and make it bounce based on how much time // has passed //----------------------------------------------------------------------------- VOID UpdateSprite( SPRITE_STRUCT* pSprite, FLOAT fTimeDelta ) { // Update the sprite position pSprite->fPosX += pSprite->fVelX * fTimeDelta; pSprite->fPosY += pSprite->fVelY * fTimeDelta; // Clip the position, and bounce if it hits the edge if( pSprite->fPosX < 0.0f ) { pSprite->fPosX = 0; pSprite->fVelX = -pSprite->fVelX; } if( pSprite->fPosX >= WINDOW_WIDTH - SPRITE_DIAMETER ) { pSprite->fPosX = WINDOW_WIDTH - 1 - SPRITE_DIAMETER; pSprite->fVelX = -pSprite->fVelX; } if( pSprite->fPosY < 0 ) { pSprite->fPosY = 0; pSprite->fVelY = -pSprite->fVelY; } if( pSprite->fPosY > WINDOW_HEIGHT - SPRITE_DIAMETER ) { pSprite->fPosY = WINDOW_HEIGHT - 1 - SPRITE_DIAMETER; pSprite->fVelY = -pSprite->fVelY; } } //----------------------------------------------------------------------------- // Name: DisplayFrame() // Desc: Blts a the sprites to the back buffer, then it blts or flips the // back buffer onto the primary buffer. //----------------------------------------------------------------------------- HRESULT DisplayFrame() { HRESULT hr; // Fill the back buffer with black, ignoring errors until the flip g_pDisplay->Clear( 0 ); // Blt the help text on the backbuffer, ignoring errors until the flip g_pDisplay->Blt( 10, 10, g_pTextSurface, NULL ); // Blt all the sprites onto the back buffer using color keying, // ignoring errors until the last blt. Note that all of these sprites // use the same DirectDraw surface. for( int iSprite = 0; iSprite < NUM_SPRITES; iSprite++ ) { g_pDisplay->Blt( (DWORD)g_Sprite[iSprite].fPosX, (DWORD)g_Sprite[iSprite].fPosY, g_pLogoSurface, NULL ); } // We are in windowed mode so perform a blt from the backbuffer // to the primary, returning any errors like DDERR_SURFACELOST if( FAILED( hr = g_pDisplay->Present() ) ) return hr; return S_OK; } //----------------------------------------------------------------------------- // Name: RestoreSurfaces() // Desc: Restore all the surfaces, and redraw the sprite surfaces. //----------------------------------------------------------------------------- HRESULT RestoreSurfaces() { LPDIRECTDRAWPALETTE pDDPal = NULL; HRESULT hr; if( FAILED( hr = g_pDisplay->GetDirectDraw()->RestoreAllSurfaces() ) ) return hr; // No need to re-create the surface, just re-draw it. if( FAILED( hr = g_pTextSurface->DrawText( NULL, HELPTEXT, 0, 0, RGB(0,0,0), RGB(255, 255, 0) ) ) ) return hr; // We need to release and re-load, and set the palette again to // redraw the bitmap on the surface. Otherwise, GDI will not // draw the bitmap on the surface with the right palette if( FAILED( hr = g_pDisplay->CreatePaletteFromBitmap( &pDDPal, MAKEINTRESOURCE( IDB_DIRECTX ) ) ) ) return hr; g_pDisplay->SetPalette( pDDPal ); SAFE_RELEASE( pDDPal ); // No need to re-create the surface, just re-draw it. if( FAILED( hr = g_pLogoSurface->DrawBitmap( MAKEINTRESOURCE( IDB_DIRECTX ), SPRITE_DIAMETER, SPRITE_DIAMETER ) ) ) return hr; return S_OK; }