Game Initialization and Shutdown - Game Coding Complete - page 137

m_screenSize = CPoint(screenWidth, screenHeight);
DXUTCreateDevice( D3D_FEATURE_LEVEL_10_1, true, screenWidth, screenHeight);
m_Renderer = shared_ptr<IRenderer>(GCC_NEW D3DRenderer11());
m_Renderer->VSetBackgroundColor(255, 20, 20, 200);
m_Renderer->VOnRestore();

m_pGame = VCreateGameAndView();
if (!m_pGame)
return false;
// now that all the major systems are initialized, preload resources
m_ResCache->Preload( “ *.ogg ” , NULL);

m_ResCache->Preload( “ *.dds ” , NULL);

m_ResCache->Preload( “ *.jpg ” , NULL);

, NULL);
You have to make sure that everything is initialized before some other subsystem
needs it to exist. Inevitably, you

m_ResCache->Preload( “ *.sdkmesh ”

' ll find yourself in a catch-22 situation, and you ' ll

'

see that two subsystems depend on each other s existence. The way out is to create

one in a hobbled state, initialize the other, and then notify the first that the other
exists. It may seem a little weird, but you ll probably run into this more than once.

The next sections tell you more about how to do these tasks and why each is
important.

'

Checking for Multiple Instances of Your Game
If your game takes a moment to get around to creating a window, a player might get
a little impatient and double-click the game ' s icon a few times. If you don ' t take the

precaution of handling this problem, you ll find that users can quickly create a few

dozen instances of your game, none of which will properly initialize. You should cre-
ate a splash screen to help minimize this problem, but it

'

' s still a good idea to detect

an existing instance of your game.

bool IsOnlyInstance(LPCTSTR gameTitle)
{

// Find the window. If active, set and return false
// Only one game instance may have this mutex at a time...

HANDLE handle = CreateMutex(NULL, TRUE, gameTitle);

// Does anyone else think ' ERROR_SUCCESS ' is a bit of an oxymoron?

if (GetLastError() != ERROR_SUCCESS)
{

HWND hWnd = FindWindow(gameTitle, NULL);
if (hWnd)
{