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DirectDraw Surface problem

Started by danong Feb 25, 2009 at 7:40 AM 1 replies 550+ views

Original Post

Feb 25, 2009 at 7:40 AM

Hi, i'm having a problem in surface blitting function, i created a primary surface, backbuffer surface ( ignore about this first ), and an offscreen surface, and i attached a bitmap and blit into the offscreen surface, but when i use the Blt() function provided by the IDirectDrawSurface7, the primary surface is not showing anything. And so later i tried to retrieve the DC using offscreen->GetDC(&dcOffscreen) and using the GDI function BitBlt(dcPrimary, 0, 0, 640, 480, dcOffscreen, 0, 0, SRCCOPY); amazingly, it worked!! What is going on here? is the function Blt() provided by the DDS7 is causing me trouble or anything? I am sure the surfaces created successfully and is following what the book told me ( i did even double check with the code provided on web ). so what's actually happening here? any clue about this? Thanks in advance. Regards, Daniel.

Evil Steve

Feb 25, 2009 at 7:49 AM

What does IDirectDrawSurface7::Blt() return? Is it an error code?

DirectDraw is extremely dated now, and of very little use. I'd strongly recommend throwing the book away and getting on on D3D. Even 2D games are written in D3D these days, DDraw is really only for legacy apps. On Vista even, DDraw is emulated through D3D.

danong

Feb 26, 2009 at 7:11 AM

Thanks for the help,
i got it solved finally,
it's due to the Clipper thingy,
as i did actually set the clipper for the windowed version but i turn it to the fullscreen surface,
so it's not working, but i got it solved once i removed the clipper.

I am actually trying to experiment something on DDraw and not actually concerning about whether it's a legacy system, as the software & hardware things are getting updated way too fast in these days,
i'd just decided to step into ddraw for some personal reasons,
no worries, soon i will be migrating to d3d =)

Thanks once again.

Regards,
Daniel.

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