From: Meta <syzmik AT concentric DOT net>
Newsgroups: comp.os.msdos.djgpp
Subject: GRX 2.0 and Mouse Flicker
Date: Tue, 19 Aug 1997 22:25:53 -0400
Organization: Concentric Internet Services
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Message-ID: <33FA55B1.404B@concentric.net>
Reply-To: syzmik AT concentric DOT net DOT NOSPAM
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To: djgpp AT delorie DOT com
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After hacking up some code for using the mouse, in polled mode, I was
horrified by the amount of flicker. Can someone post interrupt driven or
some flicker free mouse code for GRX v2? Here's what I got:

// MouseGRX.c
#include <stdio.h>
#include <grx20.h>

void main (void)
{
 GrMouseEvent MS;              // mouse structure

 if (!(GrMouseDetect()))
 {
  puts("\n\nNo mouse found on this system\n\n");
  return;
 }

 if (!(GrSetMode(GR_width_height_graphics, 640, 480)))
 {
  puts("\n\nNo Graphics Hardware Support\n\n");
  return;
 }

 GrMouseEventMode(0);          // init mouse to polled mode
 GrMouseInit();                // turn on the mouse

 GrMouseDisplayCursor();       // make the cursor visible

 while (!(MS.buttons & GR_M_RIGHT))
 {
  GrMouseGetEvent(GR_M_POLL, &MS);
  if (MS.buttons & GR_M_LEFT)
   GrPlot(MS.x, MS.y, 15);
 }

 GrMouseEraseCursor();         // erase mouse
 GrMouseUnInit();              // no more mouse
 GrSetMode(GR_80_25_text);     // no more graphics
}