202 lines
4.4 KiB
C++
202 lines
4.4 KiB
C++
/*
|
|
** Command & Conquer Red Alert(tm)
|
|
** Copyright 2025 Electronic Arts Inc.
|
|
**
|
|
** This program is free software: you can redistribute it and/or modify
|
|
** it under the terms of the GNU General Public License as published by
|
|
** the Free Software Foundation, either version 3 of the License, or
|
|
** (at your option) any later version.
|
|
**
|
|
** This program is distributed in the hope that it will be useful,
|
|
** but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
** GNU General Public License for more details.
|
|
**
|
|
** You should have received a copy of the GNU General Public License
|
|
** along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/****************************************************************************
|
|
*
|
|
* C O N F I D E N T I A L -- W E S T W O O D S T U D I O S
|
|
*
|
|
*----------------------------------------------------------------------------
|
|
*
|
|
* FILE
|
|
* xmodepg.c
|
|
*
|
|
* DESCRIPTION
|
|
* Xmode page access. (32-Bit protected mode)
|
|
*
|
|
* PROGRAMMER
|
|
* Bill Randolph
|
|
* Denzil E. Long, Jr.
|
|
*
|
|
* DATE
|
|
* January 26, 1995
|
|
*
|
|
*----------------------------------------------------------------------------
|
|
*
|
|
* PUBLIC
|
|
* SetupXPaging - Setup Xmode paging variables.
|
|
* FlipXPage - Page flip to next Xmode page.
|
|
* ShowXPage - Show the specified Xmode page.
|
|
* GetXHidPage - Get the address of the current Xmode HidPage.
|
|
* GetXSeenPage - Get the address of the current Xmode SeenPage.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#include <dos.h>
|
|
#include "video.h"
|
|
|
|
/*---------------------------------------------------------------------------
|
|
* PRIVATE DECLARATIONS
|
|
*-------------------------------------------------------------------------*/
|
|
|
|
#define PAGE0_START_OFFSET 0
|
|
#define PAGE1_START_OFFSET ((320 * 240) / 4)
|
|
|
|
/* PageFlip page values. */
|
|
static unsigned long PageStartOffsets[2] = {
|
|
PAGE0_START_OFFSET,
|
|
PAGE1_START_OFFSET
|
|
};
|
|
|
|
static long DisplayedPage;
|
|
static long NonDisplayedPage;
|
|
|
|
/****************************************************************************
|
|
*
|
|
* NAME
|
|
* SetupXPaging - Setup Xmode paging variables.
|
|
*
|
|
* SYNOPSIS
|
|
* SetupXPaging()
|
|
*
|
|
* void SetupXPaging(void);
|
|
*
|
|
* FUNCTION
|
|
*
|
|
* INPUTS
|
|
* NONE
|
|
*
|
|
* RESULT
|
|
* NONE
|
|
*
|
|
****************************************************************************/
|
|
|
|
void SetupXPaging(void)
|
|
{
|
|
DisplayedPage = 1;
|
|
NonDisplayedPage = DisplayedPage ^ 1;
|
|
}
|
|
|
|
|
|
/****************************************************************************
|
|
*
|
|
* NAME
|
|
* FlipXPage - Page flip to next Xmode page.
|
|
*
|
|
* SYNOPSIS
|
|
* FlipXPage()
|
|
*
|
|
* void FlipXPage(void);
|
|
*
|
|
* FUNCTION
|
|
*
|
|
* INPUTS
|
|
* NONE
|
|
*
|
|
* RESULT
|
|
* NONE
|
|
*
|
|
****************************************************************************/
|
|
|
|
void FlipXPage(void)
|
|
{
|
|
ShowXPage(PageStartOffsets[NonDisplayedPage]);
|
|
DisplayedPage = NonDisplayedPage;
|
|
NonDisplayedPage = DisplayedPage ^ 1;
|
|
}
|
|
|
|
|
|
/****************************************************************************
|
|
*
|
|
* NAME
|
|
* ShowXPage - Show the specified Xmode page.
|
|
*
|
|
* SYNOPSIS
|
|
* ShowXPage(page)
|
|
*
|
|
* void ShowXPage(long);
|
|
*
|
|
* FUNCTION
|
|
*
|
|
* INPUTS
|
|
* Page - Xmode page number to show.
|
|
*
|
|
* RESULT
|
|
* NONE
|
|
*
|
|
****************************************************************************/
|
|
|
|
void DisplayXPage(long page)
|
|
{
|
|
ShowXPage(PageStartOffsets[page & 1]);
|
|
DisplayedPage = page;
|
|
NonDisplayedPage = DisplayedPage ^ 1;
|
|
}
|
|
|
|
|
|
/****************************************************************************
|
|
*
|
|
* NAME
|
|
* GetXHidPage - Get the address of the current Xmode HidPage.
|
|
*
|
|
* SYNOPSIS
|
|
* HidPage = GetXHidPage()
|
|
*
|
|
* unsigned char *GetXHidPage(void);
|
|
*
|
|
* FUNCTION
|
|
*
|
|
* INPUTS
|
|
* NONE
|
|
*
|
|
* RESULT
|
|
* HidPage - Address of Xmode HidPage.
|
|
*
|
|
****************************************************************************/
|
|
|
|
unsigned char *GetXHidPage(void)
|
|
{
|
|
return((unsigned char *)PageStartOffsets[NonDisplayedPage]);
|
|
}
|
|
|
|
|
|
/****************************************************************************
|
|
*
|
|
* NAME
|
|
* GetXSeenPage - Get the address of the current Xmode SeenPage.
|
|
*
|
|
* SYNOPSIS
|
|
* SeenPage = GetXSeenPage()
|
|
*
|
|
* unsigned char *GetXSeenPage(void);
|
|
*
|
|
* FUNCTION
|
|
*
|
|
* INPUTS
|
|
* NONE
|
|
*
|
|
* RESULT
|
|
* SeePage - Address of the Xmode SeenPage.
|
|
*
|
|
****************************************************************************/
|
|
|
|
unsigned char *GetXSeenPage(void)
|
|
{
|
|
return ((unsigned char *)PageStartOffsets[DisplayedPage]);
|
|
}
|
|
|