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robasc

modifying full screen resolution

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robasc    122
I am following along with a program by doing an exercise in the book "beginning programming" in chapter 5. The exercise tells me to modify the code below to change the size of the screen resolution. I changed the screen width and height to 600 and 400 but got pop up window message "error creating Direct3D Device." Could someone tell me if I am doing this correctly or is it something with my compiler. I am using vb.net 2005 on a hp dv8125nr laptop graphics card: ATI Radeon Express 200M [code] // Beginning Game Programming // Chapter 5 // Direct3D_Fullscreen program //header files to include #include <windows.h> #include <d3d9.h> #include <time.h> //application title #define APPTITLE "Direct3D_Fullscreen" //macros to read the keyboard asynchronously #define KEY_DOWN(vk_code) ((GetAsyncKeyState(vk_code) & 0x8000) ? 1 : 0) #define KEY_UP(vk_code)((GetAsyncKeyState(vk_code) & 0x8000) ? 1 : 0) //screen resolution #define SCREEN_WIDTH 640 // I changed screen and height to 600 and 400 but got an error? #define SCREEN_HEIGHT 480 //forward declarations LRESULT WINAPI WinProc(HWND,UINT,WPARAM,LPARAM); ATOM MyRegisterClass(HINSTANCE); int Game_Init(HWND); void Game_Run(HWND); void Game_End(HWND); //Direct3D objects LPDIRECT3D9 d3d = NULL; LPDIRECT3DDEVICE9 d3ddev = NULL; //window event callback function LRESULT WINAPI WinProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam ) { switch( msg ) { case WM_DESTROY: Game_End(hWnd); PostQuitMessage(0); return 0; } return DefWindowProc( hWnd, msg, wParam, lParam ); } //helper function to set up the window properties ATOM MyRegisterClass(HINSTANCE hInstance) { //create the window class structure WNDCLASSEX wc; wc.cbSize = sizeof(WNDCLASSEX); //fill the struct with info wc.style = CS_HREDRAW | CS_VREDRAW; wc.lpfnWndProc = (WNDPROC)WinProc; wc.cbClsExtra = 0; wc.cbWndExtra = 0; wc.hInstance = hInstance; wc.hIcon = NULL; wc.hCursor = LoadCursor(NULL, IDC_ARROW); wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); wc.lpszMenuName = NULL; wc.lpszClassName = APPTITLE; wc.hIconSm = NULL; //set up the window with the class info return RegisterClassEx(&wc); } //entry point for a Windows program int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { // declare variables MSG msg; // register the class MyRegisterClass(hInstance); // initialize application //note--got rid of initinstance HWND hWnd; //create a new window hWnd = CreateWindow( APPTITLE, //window class APPTITLE, //title bar WS_EX_TOPMOST | WS_VISIBLE | WS_POPUP, //window style pg 88 CW_USEDEFAULT, //x position of window CW_USEDEFAULT, //y position of window SCREEN_WIDTH, //width of the window SCREEN_HEIGHT, //height of the window NULL, //parent window NULL, //menu hInstance, //application instance NULL); //window parameters //was there an error creating the window? if (!hWnd) return FALSE; //display the window ShowWindow(hWnd, nCmdShow); UpdateWindow(hWnd); //initialize the game if (!Game_Init(hWnd)) return 0; // main message loop int done = 0; while (!done) { if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) { //look for quit message if (msg.message == WM_QUIT) done = 1; //decode and pass messages on to WndProc TranslateMessage(&msg); DispatchMessage(&msg); } else //process game loop (else prevents running after window is closed) Game_Run(hWnd); } return msg.wParam; } // Function Definitions ------------------------------------------------// int Game_Init(HWND hwnd) { //initialize Direct3D d3d = Direct3DCreate9(D3D_SDK_VERSION); if (d3d == NULL) { MessageBox(hwnd, "Error initializing Direct3D", "Error", MB_OK); return 0; } //set Direct3D presentation parameters D3DPRESENT_PARAMETERS d3dpp; ZeroMemory(&d3dpp, sizeof(d3dpp)); d3dpp.Windowed = FALSE; d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD; d3dpp.BackBufferFormat = D3DFMT_X8R8G8B8; d3dpp.BackBufferCount = 1; d3dpp.BackBufferWidth = SCREEN_WIDTH; d3dpp.BackBufferHeight = SCREEN_HEIGHT; d3dpp.hDeviceWindow = hwnd; //create Direct3D device d3d->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hwnd, D3DCREATE_SOFTWARE_VERTEXPROCESSING, &d3dpp, &d3ddev); if (d3ddev == NULL) { MessageBox(hwnd, "Error creating Direct3D device", "Error", MB_OK); return 0; } //set random number seed srand(time(NULL)); //return okay return 1; } void Game_Run(HWND hwnd) { //make sure the Direct3D device is valid if (d3ddev == NULL) return; //clear the backbuffer to black d3ddev->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0,80,80), 1.0f, 0); //start rendering if (d3ddev->BeginScene()) { //do something //stop rendering d3ddev->EndScene(); } //display the back buffer on the screen d3ddev->Present(NULL, NULL, NULL, NULL); //check for escape key (to exit program) if (KEY_DOWN(VK_ESCAPE)) PostMessage(hwnd, WM_DESTROY, 0, 0); } void Game_End(HWND hwnd) { //release the Direct3D device if (d3ddev != NULL) d3ddev->Release(); //release the Direct3D object if (d3d != NULL) d3d->Release(); }

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Promit    13246
600 and 400 aren't legal resolutions. Go to the Display control panel, under the Settings tab. The slider there has all the resolutions that are actually allowed on your system.

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