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game engine help

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i have the following code which never fails to break at the commented line ie; hrd is always false
m_pD3D = Direct3DCreate9(D3D_SDK_VERSION);

ZeroMemory(&m_d3dpp, sizeof(m_d3dpp));
    m_d3dpp.Windowed = false;
    m_d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
    m_d3dpp.BackBufferCount = 1;
    m_d3dpp.hDeviceWindow = m_hWndMain;
    m_d3dpp.BackBufferFormat = D3DFMT_X8R8G8B8;
    m_d3dpp.BackBufferWidth = m_dwWidth;
    m_d3dpp.BackBufferHeight = m_dwHeight;    
    m_d3dpp.EnableAutoDepthStencil = 1;

HRESULT hrd = m_pD3D->CreateDevice(D3DADAPTER_DEFAULT,

if(FAILED(hrd)) //error appears here
        MessageBox(NULL,"Unable to create device","Engine Error - DLL",0);

and the classes i have are
class D3XRenderDevice
HWND m_hWndMain; //main window
HWND m_hWnd[MAX_3DHWND]; //render window(s)
UINT m_nNumhWnd; //num of render-windows
UINT m_nActivehWnd; //active window
HINSTANCE m_hDLL; //the dll module
DWORD m_dwWidth; //duh
DWORD m_dwHeight; //duh
bool m_bWindowed; //windowed mode?
char m_chAdapter[256]; //graphics adapter name
FILE * m_pLog; //log file
bool m_bRunning; //duh
virtual ~D3XRenderDevice(void){};
//Init/Release Stuff
virtual HRESULT Init(HWND,const HWND*,int,int,int,bool)=0;
virtual void Release(void)=0;
virtual bool IsRunning(void)=0;
//Rendering Stuff
virtual HRESULT UseWindow(UINT nHwnd)=0;
virtual HRESULT BeginRendering(bool bClearPixel,bool bClearDepth,bool bClearStencil)=0;
virtual void EndRendering(void)=0;
virtual HRESULT Clear(bool bClearPixel,bool bClearDepth,bool bClearStencil)=0;
virtual void SetClearColor(float fRed,float fGreen,float fBlue)=0;

typedef struct D3XRenderDevice *LPD3XRENDERDEVICE;

// This class is exported from the D3XD3D.dll
class D3XD3D : public D3XRenderDevice
// TODO: add your methods here.
D3XD3D *g_D3XD3D;
HRESULT Init(HWND,const HWND*,int,int,int,bool);
//interface functions
void Release(void);
bool IsRunning(void){return m_bRunning;}
HRESULT BeginRendering(bool,bool,bool);
HRESULT Clear(bool,bool,bool);
void EndRendering(void);
void SetClearColor(float,float,float);
HRESULT UseWindow(UINT hWnd);
D3DCOLOR m_ClearColor;
bool m_bIsSceneRunning;
bool m_bStencil;
//start the API
HRESULT Go(void);
void Log(char*,...);

and im using the book "3D Game Engine Programming" as a reference, if that helps anyone ... thanks in advance

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The value of hrd should point you at least vaguely in the right direction. CreateDevice return values are as follows:


If the method succeeds, the return value is D3D_OK. If the method fails, the return value can be one of the following: D3DERR_DEVICELOST, D3DERR_INVALIDCALL, D3DERR_NOTAVAILABLE, D3DERR_OUTOFVIDEOMEMORY.

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ok i found out its D3DERR_INVALIDCALL
but i have no idea why ...

EDIT:fixed, the depthbuffer format was missing
but now im faced with a very rapidly blinking screen

im sorry
i didnt realise i was trying to clear a non existent depth and stencil buffer

[Edited by - exgex on December 5, 2007 8:23:20 AM]

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