From: boylesgj AT lion DOT cs DOT latrobe DOT edu DOT au (Gregary J Boyles)
Newsgroups: comp.os.msdos.djgpp
Subject: GRX context problem.
Date: 26 Apr 1997 16:22:49 GMT
Organization: Comp.Sci & Comp.Eng, La Trobe Uni, Australia
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Distribution: world
Message-ID: <5jta4p$gce@lion.cs.latrobe.edu.au>
NNTP-Posting-Host: lion.cs.latrobe.edu.au
To: djgpp AT delorie DOT com
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Can some body please explain to me why the #$%^ this program fails to put
anything on the screen. I am so god damned frustrated with this!
If I comment out the marked lines it works fine. But what the hell is the
use of memory contexts if you can never see them?????

#include <pc.h>
#include <grx20.h>
#include <iostream.h>

void main()
{
  GrSetDriver("VESA");
  GrSetMode(GR_width_height_color_graphics,1024,768,256);
  long color=GrAllocColor(200,240,34);
  GrContext *Context=GrCreateContext(1024,768,NULL,NULL);
*  GrSetContext(Context);
  GrFilledCircle(500,300,500,color);
*  GrBitBlt(NULL,100,100,Context,100,100,200,200,GrWRITE);
  cin.get();
}