From: "Alexei A. Frounze" Newsgroups: comp.os.msdos.djgpp Subject: Re: Z-Buffered Bitmaps Date: Thu, 25 May 2000 00:55:08 +0400 Organization: MTU-Intel ISP Lines: 37 Message-ID: <392C41AC.B5D4B0E0@mtu-net.ru> References: <8gfm6n$51g6$1 AT newssvr04-int DOT news DOT prodigy DOT com> NNTP-Posting-Host: ppp109-213.dialup.mtu-net.ru Mime-Version: 1.0 Content-Type: text/plain; charset=koi8-r Content-Transfer-Encoding: 7bit X-Trace: gavrilo.mtu.ru 959201951 97707 212.188.109.213 (24 May 2000 20:59:11 GMT) X-Complaints-To: usenet-abuse AT mtu DOT ru NNTP-Posting-Date: 24 May 2000 20:59:11 GMT X-Mailer: Mozilla 4.72 [en] (Win95; I) X-Accept-Language: ru,en To: djgpp AT delorie DOT com DJ-Gateway: from newsgroup comp.os.msdos.djgpp Reply-To: djgpp AT delorie DOT com You don't really need any Z-buffers. At least Z-buffer is a computer gfx term usually used in 3d gfx. What you need is a list of all your bitmaps (pointers to the images) plus a Z(depth) coordinate. Then you just use painter algorithm, i.e. back to front bitblitting to the screen buffer. It's recommended to make all these blits in a virtual screen and flip it to your display only when you have finished back to fron drawings. This is a basic idea. For modern fast computers (any Pentium) this should not be a problem. Old ones are slow for such a simple approach. Some extra stuff is needed for speeding up your code for those computers. Best regards. Alexei A. Frounze ----------------------------------------- Homepage: http://alexfru.chat.ru Mirror: http://members.xoom.com/alexfru Robert Boles wrote: > > Hello, > Is there any way to to make Z-Buffered bitmaps in Allegro. > > For example: I wish to blit several bitmaps to a back buffer, and then blit > this buffer to the screen. > > Typical double buffered graphics. However, I have no way of easily bliting > the bitmaps in the right order (it is a muli-threaded application). Each > thread blits to the back buffer. I do have a depth assigned to each of the > bitmaps, so a Z-Buffered blit to the back buffer would make my life easy. > > Any libraries would be great. > > Any help is greatly appreciated.