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Back Surface Issues

Started by EnochDagor Sep 16, 2000 at 1:13 PM 4 replies 650+ views

Original Post

Sep 16, 2000 at 1:13 PM

Ok, I first create my Primary Surface:

        
ZeroMemory(&ddsd, sizeof(ddsd));
ddsd.dwSize = sizeof(ddsd);
ddsd.dwFlags = DDSD_CAPS | DDSDBACKBUFFERCOUNT;
ddsd.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE | DDSCAPS_FLIP | DDSCAPS_COMPLEX;
ddsd.dwBackBufferCount = 1;

HRESULT hRet = lpDD->CreateSurface(&ddsd, &lpDDSPrimary, NULL);
if(hRet != DD_OK)
{
   return 1;
}
 [/source]

Then a little later I try to grab my attached surface:

[source]
ddscaps.dwCaps = DDSCAPS_BACKBUFFER;

HRESULT ddrval = lpDDSPrimary->GetAttachedSurface(&ddscaps, &lpDDSBack);

But, I get a DDERR_NOTFOUND error... What object is it referring to? All DDSurfaces I am using are valid... I got both declared as LPDIRECTDRAWSURFACE7. Any ideas? Edited by - EnochDagor on 9/16/00 1:16:00 PM Edited by - EnochDagor on 9/16/00 1:26:09 PM

Bigshot

Sep 16, 2000 at 1:31 PM

The code you provided looks like it should work, although I think you meant to put:


ddsd.dwFlags = DDSD_CAPS | DDSD_BACKBUFFERCOUNT;

instead of


ddsd.dwFlags = DDSD_CAPS | DDSDBACKBUFFERCOUNT;

You might be forgetting to do something in the initialization. Here''s the code I normally use right before I create the primary and back surfaces:


// create IDirectDrawdirectdraw interface 1.0 object
if (FAILED(DirectDrawCreate(NULL,&lpdd_temp,NULL)))
   return(0);

// now query for IDirectDRAW7
if (FAILED(lpdd_temp->QueryInterface(IID_IDirectDraw7,
                               (LPVOID *)&lpdd)))
   return(0);

// set cooperation level to requested mode 
if (FAILED(lpdd->SetCooperativeLevel(main_window_handle,
           DDSCL_ALLOWMODEX | DDSCL_FULLSCREEN | 
           DDSCL_EXCLUSIVE | DDSCL_ALLOWREBOOT)))
    return(0);

// set the display mode
if (FAILED(lpdd->SetDisplayMode(width,height,bpp,0,0)))
   return(0);

Good luck!

Alex

EnochDagor

Author

EnochDagor

Sep 16, 2000 at 1:38 PM

I was under the impression that for DirectX 7.0 I didn''t need to create the first DirectDraw Object and that I could just use

HRESULT ddret = DirectDrawCreateEx(NULL, (LPVOID*)&lpDD, IID_IDirectDraw7, NULL);

Am I wrong? I will try it your way and see what I get...

Ironblayde

Sep 16, 2000 at 1:44 PM

That''s not the problem; using DirectDrawCreateEx() will work just fine.

-Ironblayde
Aeon Software

EnochDagor

Author

EnochDagor

Sep 16, 2000 at 1:51 PM

Yeah Alex, it didn''t work. So, I''m gonna stick with the DirectDrawCreateEx()....

I should also mention that this is being handled within a class that handles all the DDraw stuff.

The code that calls the Primary and Back surface creation is in the WinMain...

It looks like this:

DDRAWMANAGER DDraw;

DDraw->InitDD();
//I handle some error handling here
DDraw->InitDDSPrimary();
//Some more error handling
DDraw->InitDDSBack();
//Some more error handling (where the error is caught)

Now, the InitDD is your every day run of the mill DD initialization.

The Primary was described in my first post

The Back was described at the later part of my first post.

EnochDagor

Author

EnochDagor

Sep 16, 2000 at 3:17 PM

Got it... I needed to add

ZeroMemory(&ddscaps, sizeof(ddscaps));

before I called the GetAttachedSurface...

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