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From: terrell@druhi.ATT.COM (TerrellE)
Newsgroups: comp.lang.pascal,comp.sys.ibm.pc
Subject: Buffered Graphics for CGA with Turbo Pascal???
Message-ID: <4429@druhi.ATT.COM>
Date: 21 Jul 89 14:48:41 GMT
Reply-To: terrell@druhi.ATT.COM (TerrellE)
Organization: AT&T, Denver, CO
Lines: 25



OK Turbo Pascal Fans:

Here's my problem:  I want to do buffered graphics with Turbo Pascal (v. 5.0).
By buffered graphics I mean that I want to have a program issue many graphics
commands to a memory buffer (but not to the screen).  When the drawing is
complete, I want to blast it to the screen all at once.

I believe that Turbo's BGI driver for EGA allows this (I think that there
is support for multiple pages).  However, I want to do this with CGA.  Since
CGA is memory mapped, if the Turbo graphics commands can be sent to a
memory buffer instead of the screen, it would be easy to dump the buffer
to the screen (by just copying all of the bytes over).

Can I do this???  If so, how does one specify that the output of the Turbo
graphics commands go to a memory buffer rather than the screen???


Thanks in advance,




Eric Terrell	(att!druhi!terrell)