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Direct Draw Surface larger than the screen?


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#1 df14   Members   -  Reputation: 122

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Posted 29 October 1999 - 06:14 AM

If I want to blt a DirectDrawSurface larger than the screen I get a RuntimeError.

Thanx
df14


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#2 Gandalf   Members   -  Reputation: 122

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Posted 28 October 1999 - 02:37 AM

Maybe your hardware is inadequate. Not all display drivers support larger surfaces in system memory. Or your version of DirectX can´t support it (required DirectX 5.0 or higher).

Gandalf.



#3 Aldacron   GDNet+   -  Reputation: 3274

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Posted 29 October 1999 - 05:34 AM

If the drivers didn't support wider surfaces then they wouldn't be able to be created, right?

Try the following code, where lpdd is your main direct draw object:

code:

DDCAPS driver_caps;

lpdd->GetCaps (&driver_caps,NULL);
if (driver_caps.dwCaps2 & DDCAPS2_WIDESURFACES)
{
// Now you know you can handle wide surfaces.
// so do something here to indicate it
}



If your driver can handle wide surfaces, it maybe that you need to set a Clipper if you're trying to blit the whole surface, or just blit a portion of the surface instead. That's a guess, though.

[This message has been edited by Aldacron (edited October 29, 1999).]


#4 INVERSED   Members   -  Reputation: 172

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Posted 29 October 1999 - 06:14 AM

The same thing happened to me. I could create the wide surfaces, but if I tried to blit it to the main surface my program would crash. I was just blitting a small square of it too.

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--Orion McClelland





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