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Milquetoasty

DirectDraw - Backbuffer Problems

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HRESULT: 0x887600ff (2289434879) Name: DDERR_NOTFOUND Description: Requested item was not found Severity code: Failed Facility Code: FACILITY_D3D (2166) Error Code: 0x00ff (255) This error is propagated from a primarySurface->GetAttachedSurface(..) call. I use this code to create my surfaces
	DDSURFACEDESC2 ddsd;
	DDSCAPS2 ddscaps;
	HRESULT ddrval;

	memset( &ddsd, 0, sizeof(ddsd) );
	ddsd.dwSize = sizeof( ddsd );

	ddsd.dwFlags = DDSD_CAPS | DDSD_BACKBUFFERCOUNT;
	ddsd.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE | DDSCAPS_FLIP | DDSCAPS_COMPLEX;
	ddsd.dwBackBufferCount = 1;

	ddrval = idd->CreateSurface( &ddsd, &surfacePrimary, NULL );
	if( ddrval != DD_OK )
	{
		idd->Release();
	}

	// Get the pointer to the back buffer - fails
	ddscaps.dwCaps = DDSCAPS_BACKBUFFER;
	ddrval = surfacePrimary->GetAttachedSurface(&ddscaps, &surfaceBack);
	if( ddrval != DD_OK )
	{
		surfacePrimary->Release();
		idd->Release();
	}

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Quote:
// Get the pointer to the back buffer - fails
ddscaps.dwCaps = DDSCAPS_BACKBUFFER;


So what are the other members of ddscaps set to?

If this is a debug build, they will most likely be set to 0xCCCCCCCC (the value put into uninitialised variables and members in debug builds).

That means your code (as presented) is asking DirectDraw for a back buffer AND whatever bizarre combination of caps flags 0xCCCCCCCC ends up mapping to.

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There is a DDSCAPS2 member in DDSURFACEDESC2, which is what I use to create a backbuffer. I dunno why you switched it from the primary surface (ddsd.ddsCaps) to the backbuffer (ddscaps). the DDSURFACEDESC2 is passed in by reference, so the first call probably alters it somehow, and by using a different object for the backbuffer, you get an error.


ddsd.ddsCaps.dwCaps = DDSCAPS_BACKBUFFER;
if(FAILED(surfacePrimary->GetAttachedSurface(&ddsd.ddsCaps, &surfaceBack)))
{
// Handle the error
}



If it doesn't work, output what error ddrval gives. It will help you narrow down the problem.

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