Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!linus!philabs!cmcl2!harvard!caip!cbmvax!carolyn
From: carolyn@cbmvax.cbm.UUCP (Carolyn Scheppner)
Newsgroups: net.micro.amiga
Subject: Re: DPAINT & Interlace
Message-ID: <270@cbmvax.cbmvax.cbm.UUCP>
Date: Wed, 21-May-86 10:34:08 EDT
Article-I.D.: cbmvax.270
Posted: Wed May 21 10:34:08 1986
Date-Received: Sat, 24-May-86 01:22:29 EDT
References: <3122@decwrl.DEC.COM>
Reply-To: carolyn@cbmvax.UUCP (Carolyn Scheppner)
Organization: Commodore Technology, West Chester, PA
Lines: 95
Keywords: Interlace
Summary: Turning on Interlace

In article <3122@decwrl.DEC.COM> mickol@highfi.DEC (NPO Tech Support Mgr, DTN 223-9609, MLO5-3/F13) writes:
>Does anyone know how to use DPAINT in lo-res mode with interlace turned on.

   You need to put the display in Interlace mode before entering DPaint.
The following program (SetLace.c) will turn Interlace ON and OFF.
   USAGE:   SetLace y  (ON)   OR   SetLace n

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Carolyn Scheppner -- CBM   >>Amiga Technical Support<<
                     UUCP  ...{allegra,caip,ihnp4,seismo}!cbmvax!carolyn 
                     PHONE 215-431-9180
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

---------------------------- CUT HERE ----------------------------------

/************************************************************************
 *  SetLace -- Program to force the Amiga into interlaced display
 *             regardless of the interlace status of the currently
 *             active Screens (ViewPorts).  Run from the CLI (only).
 *
 *             1>SetLace        -- Set forced Interlace mode
 *             1>SetLace off    -- Clear forced Interlace mode
 *
 *   Bob Pariseau -- November 2, 1985
 *
 ************************************************************************/

#include <exec/types.h>
#include <exec/tasks.h>
#include <exec/libraries.h>
#include <graphics/copper.h>
#include <graphics/display.h>
#include <graphics/gfxbase.h>
#include <graphics/text.h>
#include <graphics/view.h>
#include <hardware/blit.h>
#include <intuition/intuitionbase.h>

struct GfxBase *GfxBase;
struct IntuitionBase *IntuitionBase;

main(argc, argv)
  int argc;
  char  *argv[];
{
  BOOL TurnItOn;

  TurnItOn = TRUE;
  if (argc > 1)
    if (!strcmp(argv[1], "off")) TurnItOn = FALSE;
  
  GfxBase = (struct GfxBase *)OpenLibrary("graphics.library", 0);
  if (GfxBase == NULL) exit(1000);

  IntuitionBase = (struct IntuitionBase*)
                  OpenLibrary("intuition.library", 0);
  if (IntuitionBase == NULL)
  {
    CloseLibrary(GfxBase);
    exit(2000);
  }

/*  The system_bplcon0 value is ORed into all copper instructions that
 *  change bplcon0 (one of the hardware bitplane control registers)
 *  whenever copper lists are formed by the graphics library copper
 *  list management routines.  This value provides a control context
 *  for system display that overrides the normal control values usually
 *  managed by Intuition.  In particular, Intuition manages the interlace
 *  control in the View structure, so we have to do our control here
 *  to give it some permanence.
 */

  if (TurnItOn)
    GfxBase->system_bplcon0 |=  INTERLACE;
  else
    GfxBase->system_bplcon0 &= !INTERLACE;

/*  Now we have to get all the copper lists rebuilt.  The easiest way
 *  to do this is to have Intuition do it for us.
 */

 RemakeDisplay();

/*  Be good, and clean up. */

  CloseLibrary(GfxBase);
  CloseLibrary(IntuitionBase);
}

-- 
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Carolyn Scheppner -- CBM   >>Amiga Technical Support<<
                     UUCP  ...{allegra,caip,ihnp4,seismo}!cbmvax!carolyn 
                     PHONE 215-431-9180
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=