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Initial commit of Command & Conquer Red Alert source code.
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LFeenanEA
282
WINVQ/VQM32/VIDEO.CPP
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282
WINVQ/VQM32/VIDEO.CPP
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/*
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** Command & Conquer Red Alert(tm)
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** Copyright 2025 Electronic Arts Inc.
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**
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** This program is free software: you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation, either version 3 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/****************************************************************************
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*
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* 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
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*
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*----------------------------------------------------------------------------
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*
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* FILE
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* video.c
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*
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* DESCRIPTION
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* Video mode setting. (32-Bit protected mode)
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*
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* PROGRAMMER
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* Denzil E. Long, Jr.
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*
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* DATE
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* Febuary 3, 1995
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*
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*----------------------------------------------------------------------------
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*
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* PUBLIC
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* SetVideoMode - Set the video mode.
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* GetDisplayInfo - Get the display info for the current video mode.
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* GetVBIBit - Get the vertical blank bit polarity.
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*
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****************************************************************************/
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#include <stdlib.h>
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#include <dos.h>
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#include <conio.h>
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#ifndef __WATCOMC__
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#include <pharlap.h>
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#include <pldos32.h>
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#else
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#include "realmode.h"
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#endif
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#include "video.h"
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/*---------------------------------------------------------------------------
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* PRIVATE DECLARATIONS
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*-------------------------------------------------------------------------*/
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static DisplayInfo _Display = {-1,0,0,0,NULL};
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/****************************************************************************
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*
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* NAME
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* SetVideoMode - Set the display to the specified video mode.
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*
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* SYNOPSIS
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* DisplayInfo = SetVideoMode(Mode)
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*
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* DisplayInfo *SetVideoMode(long);
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*
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* FUNCTION
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* Set the video display adapter to the desired video mode.
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*
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* INPUTS
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* Mode - Desired video mode.
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*
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* RESULT
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* DisplayInfo - Pointer to DisplayInfo structure, otherwise 0 for error.
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*
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****************************************************************************/
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DisplayInfo *SetVideoMode(long mode)
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{
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#ifdef __WATCOMC__
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union REGS regs;
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struct SREGS sregs;
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#else
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union _REGS regs;
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#endif
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DisplayInfo *di = NULL;
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VESAModeInfo *vminfo;
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long error;
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/* Initialize the video manager on the first invocation of
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* SetVideoMode()
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*/
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if (_Display.Mode == -1) {
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_Display.VBIbit = TestVBIBit();
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}
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/* Clear the VRAM before enabling the mode so that there is
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* not any garbage on the screen.
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*/
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ClearVRAM();
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/* If the requested mode is the same as the current mode then
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* we do not need to do anything.
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*/
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if (mode != _Display.Mode) {
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/* Uninitialize VESA if the previous mode was a VESA mode and the new
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* mode is not.
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*/
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if (((_Display.Mode >= VESA_MIN) && (_Display.Mode <= VESA_MAX))
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&& ((mode < VESA_MIN) && (mode > VESA_MAX))) {
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UninitVESA();
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}
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/* Set display to an XMode. */
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if ((mode >= XMODE_MIN) && (mode <= XMODE_MAX)) {
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SetXMode(mode);
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ClearXMode();
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SetupXPaging();
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ShowXPage(0);
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_Display.Mode = mode;
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_Display.Extended = NULL;
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di = &_Display;
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/* Set display resolution information */
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switch (mode) {
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case XMODE_320X200:
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_Display.XRes = 320;
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_Display.YRes = 200;
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break;
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case XMODE_320X240:
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_Display.XRes = 320;
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_Display.YRes = 240;
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break;
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case XMODE_320X400:
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_Display.XRes = 320;
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_Display.YRes = 400;
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break;
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case XMODE_320X480:
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_Display.XRes = 320;
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_Display.YRes = 480;
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break;
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case XMODE_360X400:
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_Display.XRes = 360;
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_Display.YRes = 400;
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break;
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case XMODE_360X480:
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_Display.XRes = 360;
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_Display.YRes = 480;
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break;
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}
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}
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else if ((mode >= VESA_MIN) && (mode <= VESA_MAX)) {
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/* Initialize the VESA manager if the current mode is not a VESA
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* mode.
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*/
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if ((_Display.Mode < VESA_MIN) || (_Display.Mode > VESA_MAX)) {
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error = InitVESA();
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}
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if (!error) {
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/* Set the display to MCGA before going into VESA. This needs to be
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* done to ensure that the video ram selector is initialized. This
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* fixes a bug in some VESA BIOS'.
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*/
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#ifndef __WATCOMC__
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regs.x.ax = mode;
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_int86(0x10, ®s, ®s);
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#else
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segread(&sregs);
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regs.x.eax = mode;
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int386x(0x10, ®s, ®s, &sregs);
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#endif
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if ((vminfo = SetVESAMode(mode)) != NULL) {
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_Display.Mode = mode;
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_Display.XRes = (long)vminfo->XRes;
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_Display.YRes = (long)vminfo->YRes;
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_Display.Extended = vminfo;
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di = &_Display;
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}
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}
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}
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else {
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#ifndef __WATCOMC__
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regs.x.ax = mode;
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_int86(0x10, ®s, ®s);
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#else
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segread(&sregs);
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regs.x.eax = mode;
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int386x(0x10, ®s, ®s, &sregs);
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#endif
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_Display.Mode = mode;
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_Display.XRes = 320;
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_Display.YRes = 200;
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_Display.Extended = NULL;
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di = &_Display;
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}
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} else {
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di = &_Display;
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}
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return (di);
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}
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/****************************************************************************
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*
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* NAME
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* GetDisplayInfo - Get the display info for the current video mode.
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*
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* SYNOPSIS
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* DisplayInfo = GetDisplayInfo()
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*
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* DisplayInfo *GetDisplayInfo(void);
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*
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* FUNCTION
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* Return a pointer to the current display information structure.
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*
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* INPUTS
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* NONE
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*
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* RESULT
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* DisplayInfo - Pointer to initialized display info or NULL if not valid.
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*
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****************************************************************************/
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DisplayInfo *GetDisplayInfo(void)
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{
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if (_Display.Mode != 0) {
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return (&_Display);
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} else {
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return (NULL);
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}
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}
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/****************************************************************************
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*
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* NAME
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* GetVBIBit - Get the vertical blank bit polarity.
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*
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* SYNOPSIS
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* VBIBit = GetVBIBit()
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*
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* long GetVBIBit(void);
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*
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* FUNCTION
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* Return the polarity of the vertical blank bit.
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*
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* INPUTS
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* NONE
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*
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* RESULT
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* VBIBit - Vertical blank bit polarity.
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*
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****************************************************************************/
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long GetVBIBit(void)
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{
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return (_Display.VBIbit);
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}
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