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Error Locking Surface... DDERR_SURFACELOST

Started by ACAC Jan 22, 2002 at 3:37 PM 2 replies 7.5k views

Original Post

Jan 22, 2002 at 3:37 PM

Ive got an error when I lock my surface, I cant figure out why, the return code is DDERR_SURFACELOST, but where does it lose the surface!?? The pixels arent drawn eitha...

  
int GameMain()
{
	HRESULT hret;


	if(KEYDOWN(VK_ESCAPE)) { 
		UnInit();
		PostQuitMessage(0); }

	CLEARMEM(ddsd);

	hret = lpddsback->Lock(NULL, &ddsd, DDLOCK_WAIT | DDLOCK_SURFACEMEMORYPTR, NULL); // this is possibly the offending line

	if(hret != DD_OK)
	{		
		ERR(hret);
		return 1;
	}

	UCHAR *videomem = (UCHAR*)ddsd.lpSurface;


	for(int x = 0; x < 500; x++)
	{
		for(int y = 0; y < 500; y++)
		{
	videomem[x + y * ddsd.lPitch] = _RGB(50,0,0);
		}
	}

	hret = lpddsback->Unlock(NULL);
	if(hret != DD_OK)
	{		
		ERR(hret);
		return 1;
	}

	hret = lpddsprimary->Flip(NULL,DDFLIP_WAIT);
	if(hret != DD_OK)
	{		
		ERR(hret);
		return 1;
	}

	return 0;
}

Edited by - ACAC on January 22, 2002 4:41:04 PM

gmcbay

Jan 22, 2002 at 3:50 PM

A surface is ''lost'' when it is flushed out of video memory. This could happen for a number of reasons, one of the most common is the screen mode changes (fullscreen to windowed)..

If a DX call returns an error regarding the surface being lost, you must call the restore method (lpddsback->Restore(); should work in your case) before trying to access it again.

ACAC

Jan 22, 2002 at 4:05 PM

Hmmmm, ok I added that in, but now when I run it, it seems to put pixels on the screen, well garbled on the right of it, then when I exit the window goes smaller, like ( halfway through changing the screen size ) then it gives me an illegal operation error.

HM!!!
It has to be somthing to do with the back buffer, I dont know what though, well heres my init code.....

  
int Game_Init()
{
	HRESULT hret;

	hret = DirectDrawCreate(NULL, &lpdd, NULL);
	if(hret != DD_OK)
	{		
		ERR(hret);
		return 1;
	}

	hret = lpdd->QueryInterface(IID_IDirectDraw4,(LPVOID*)&lpdd4);
	if(hret != DD_OK)
	{		
		ERR(hret);
		return 1;
	}

	if(WINDOWED >= 1)
	{
		hret = lpdd4->SetCooperativeLevel(Ghwnd,DDSCL_NORMAL);
		if(hret != DD_OK)
		{		
		ERR(hret);
		return 1;
		}
		hret = lpdd4->SetDisplayMode(400,400,8,NULL,NULL);
		if(hret != DD_OK)
		{		
		ERR(hret);
		return 1;
		}
	}
	else
	{
		hret = lpdd4->SetCooperativeLevel(Ghwnd,DDSCL_FULLSCREEN | DDSCL_ALLOWREBOOT | DDSCL_EXCLUSIVE);
		if(hret != DD_OK)
		{		
		ERR(hret);
		return 1;
		}	

		hret = lpdd4->SetDisplayMode(SW,SH,SBPP,NULL,NULL) ;
		if(hret != DD_OK)
		{		
		ERR(hret);
		return 1;
		}
	}

	
	// clear out DDSD

	CLEARMEM(ddsd);
	//Sort the flags

	ddsd.dwSize = sizeof(ddsd); 
	ddsd.dwFlags = DDSD_CAPS | DDSD_BACKBUFFERCOUNT;
	ddsd.dwBackBufferCount = 1;

	// request a complex flippable surface

	ddsd.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE | DDSCAPS_COMPLEX | DDSCAPS_FLIP;

	hret = lpdd4->CreateSurface(&ddsd, &lpddsprimary, NULL);
	if(hret != DD_OK)
	{		
		ERR(hret);
		return 1;
	}

	ddsd.ddsCaps.dwCaps = DDSCAPS_BACKBUFFER;

	// get the backbuffer

	hret = lpddsprimary->GetAttachedSurface(&ddsd.ddsCaps,&lpddsback);
	if(hret != DD_OK)
	{		
		ERR(hret);
		return 1;
	}

	return 0;
}

if thats any use, thanks........

OldGuy

Jan 22, 2002 at 5:01 PM

I believe you have to restore all surfaces, including back buffer(s). Also, I believe you have to redraw the surface after the restore.

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