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Initial commit of Command & Conquer Red Alert source code.

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LFeenanEA
2025-02-27 16:15:05 +00:00
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WINVQ/VQM32/TESTVB.CPP Normal file
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/*
** 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
* testvb.c
*
* DESCRIPTION
* Video mode setting. (32-Bit protected mode)
*
* PROGRAMMER
* Denzil E. Long, Jr.
*
* DATE
* Febuary 3, 1995
*
*----------------------------------------------------------------------------
*
* PUBLIC
* TestVBIBit - Test the polarity of the vertical blank bit.
*
****************************************************************************/
#include <sys\timeb.h>
#ifdef __BORLANDC__
#include "portio.h"
#else
#include <conio.h>
#endif
/****************************************************************************
*
* NAME
* TestVBIBit - Test the polarity of the vertical blank bit.
*
* SYNOPSIS
* Polarity = TestVBIBit()
*
* long TestVBIBit(void);
*
* FUNCTION
*
* INPUTS
* NONE
*
* RESULT
* Polarity - Polarity of the vertical blank bit.
*
****************************************************************************/
long TestVBIBit(void)
{
static struct timeb mytime;
long curtime;
long endtime;
unsigned long high = 0;
unsigned long low = 0;
/* Set the check time for .25 (1/4) of a second. */
ftime(&mytime);
curtime = ((mytime.time * 1000) + mytime.millitm);
endtime = (curtime + (1000 / 4));
/* Sample the vertical blank bit for the specified period of time.
* The state in which it is in the least is the vertical blank state,
* the state in which it is in the most is the active scan state.
*/
while (endtime >= curtime) {
ftime(&mytime);
curtime = ((mytime.time * 1000) + mytime.millitm);
if (inp(0x3DA) & 0x08) {
high++;
} else {
low++;
}
}
return (high > low);
}