/*
** 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 .
*/
/***************************************************************************
** C O N F I D E N T I A L --- W E S T W O O D A S S O C I A T E S **
***************************************************************************
* *
* Project Name : LIBRARY *
* *
* File Name : VIDEO.C *
* *
* Programmer : David Dettmer *
* *
* Last Update : June 29, 1995 [PWG] *
* *
*-------------------------------------------------------------------------*
* Functions: *
* Find_Video_Mode -- Converts a dos video mode to a WWLIB video mode *
* Get_Video_Mode -- Returns the current video mode. *
* Set_Video_Mode -- Sets the requested video mode *
* Set_Lores_Function_Pointers -- Sets up the lowres function pointers *
* Set_HiRes_Function_Pointers -- Sets the HiRes function pointers *
* Set_Original_Video_Mode -- sets mode to restore system to on exit *
* Get_Original_Video_Mode -- Gets the original video mode value *
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#include
#include "iostream.h"
#include "video.h"
#include "descmgmt.h"
#include "mcgaprim.h"
#include "gbuffer.h"
#include "vbuffer.h"
#include "wwmem.h"
#include "playcd.h"
extern "C" int MInstalled ;
extern "C" void Hide_Mouse(void);
extern "C" void Show_Mouse(void);
extern "C" void Reset_Mouse (void) ;
extern "C" int Vesa_Hook ( REALPTR function ) ;
extern "C" void Remove_Vesa (void) ;
extern "C" SEGSEL RMVesaVectorSel ;
extern "C" REALPTR VesaFunc;
/*=========================================================================*/
/* Define the global variables that we require. */
/*=========================================================================*/
long BankTable[MAX_BANK_ENTRIES];
int GraphicMode = UNINITIALIZED_MODE;
long XRes = 0;
long YRes = 0;
REALPTR VesaFunc;
unsigned long RMVesaVector ;
unsigned long RMVesaRegs ;
/*=========================================================================*
* Private Varirables *
* *
* VInfo - Protected mode copy of VInfo structure. *
* ModeInfo - Protected mode copy of ModeInfo structure. *
* rpModeInfo - Real ptr to ModeInfo structure in conventional memory. *
* rpVInfo - Real ptr to VInfo structure in conventional memory. *
* _regs - Registers used for calling software interrupts. *
*=========================================================================*/
PRIVATE void * rpModeInfo = NULL;
PRIVATE SEGSEL rpModeInfoSel ;
PRIVATE void * rpVInfo = NULL;
PRIVATE SEGSEL rpVInfoSel ;
PRIVATE long _OriginalVideoMode = UNINITIALIZED_MODE;
PRIVATE VesaInfoType VInfo;
PRIVATE VesaModeInfoType ModeInfo;
/*=========================================================================*/
/* The following PRIVATE functions are in this file: */
/*=========================================================================*/
PRIVATE long Install_Vesa(void);
PRIVATE long Vesa_Get_Mode_Info(long mode);
PRIVATE long Vesa_Set_Mode(long mode);
PRIVATE void Init_Bank_Table(void);
PRIVATE VOID Set_LoRes_Function_Pointers(VOID);
PRIVATE VOID Set_HiRes_Function_Pointers(VOID);
extern "C" long Vesa_XRes(void);
extern "C" long Vesa_YRes(void);
extern "C" char CurrentPalette [ 256 * 3 ] ;
extern "C" char PaletteTable [ 1024 ] ;
/*= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =*/
/***************************************************************************
* GET_VIDEO_MODE -- Returns the current video mode. *
* *
* INPUT: none *
* *
* OUTPUT: returns the graphic mode as a WWLIB library define *
* *
* WARNINGS: none *
* *
* HISTORY: *
* 01/25/1994 : Created. *
*=========================================================================*/
int Get_Video_Mode(void)
{
union REGS regs;
if( GraphicMode == UNINITIALIZED_MODE )
{
regs . x . eax = 0xf00 ; // get graphic mode
int386 ( 0x10 , & regs , & regs ) ;
return ( regs . w . ax & 0xff ) ;
}
return(GraphicMode); // return the graphic mode
}
/***************************************************************************
* Install_Vesa -- Initializes the vesa driver if it exists *
* *
* INPUT: none *
* *
* OUTPUT: return -1 if error/VESA not supported. *
* *
* WARNINGS: This function will not work unless a vesa compatable driver *
* is installed in either hardware or software. *
* *
* HISTORY: *
* 11/21/1994 PWG : Created. *
*=========================================================================*/
PRIVATE long Install_Vesa(void)
{
UINT paras;
USHORT longest ;
union REGS regs;
struct SREGS sregs;
/* Calculate size of VesaInfo structure in paragraphs */
paras = ( sizeof(VesaInfoType) + 15 ) >> 4 ;
/* Allocate real-mode memory for VESA structure. */
if ( DPMI_real_alloc ( paras , & rpVInfoSel , & longest ) ) return - 1 ;
rpVInfo = ( void * ) ( rpVInfoSel . seg << 4 ) ;
/* Calculate size of VesaModeInfo structure in paragraphs */
paras = ( sizeof(VesaModeInfoType) + 15 ) >> 4 ;
/* Allocate real-mode memory for VESA structure. */
if ( DPMI_real_alloc ( paras , & rpModeInfoSel , & longest ) )
{
Remove_Vesa();
return (-1);
}
rpModeInfo = ( void * ) ( rpModeInfoSel . seg << 4 ) ;
/* Clear the input buffer */
memset ( rpVInfo , 0 , sizeof ( VesaInfoType) ) ;
/* Read Vesa information */
regs . x . eax = 0x4f00 ;
regs . x . edi = 0 ;
sregs . es = rpVInfoSel . seg ;
DPMI_real_intr ( 0x10 , & regs , & sregs );
regs . x . eax &= 0xffff ;
if ( regs . x . eax != 0x004F) return (-1);
Mem_Copy ( rpVInfo , & VInfo , sizeof(VesaInfoType)) ;
return 0;
}
/***************************************************************************
* VESA_GET_MODE_INFO -- Gets info about specified video mode *
* *
* INPUT: long - the mode we are requesting info about *
* *
* OUTPUT: long - 0 if sucessful, -1 if failure *
* *
* HISTORY: *
* 11/21/1994 PWG : Created. *
*=========================================================================*/
PRIVATE long Vesa_Get_Mode_Info(long mode)
{
union REGS regs;
struct SREGS sregs;
if (rpModeInfo )
{
/* Clear the input buffer */
memset ( rpModeInfo, 0, sizeof(VesaModeInfoType));
/* Set up function call */
regs . x . eax = 0x4F01;
regs . x . ecx = mode;
regs . x . edi = 0 ;
sregs . es = rpModeInfoSel . seg ;
DPMI_real_intr ( 0x10 , & regs , & sregs );
regs . x . eax &= 0xffff ;
if ( regs . x . eax == 0x004F)
{
Mem_Copy ( rpModeInfo , &ModeInfo , sizeof(VesaModeInfoType));
// this part is only temporary until Phil get the documentation
// for DPMI funtion 0x301 simulate real call
// in the mean time we will be making call to the vesa driver
// thru a real interrupt
if ( Vesa_Hook ( ModeInfo . WinFunc ) ) return ( -1 ) ;
return (0);
}
}
return (-1);
}
/***************************************************************************
* VESA_SET_MODE -- Sets the specified Vesa mode *
* *
* INPUT: long - the mode we wish to set *
* *
* OUTPUT: long - 0 if all is ok, -1 if we cannot set this mode *
* *
* WARNINGS: You must call Install_Vesa before calling Vesa_Set_Mode *
* *
* HISTORY: *
* 11/21/1994 PWG : Created. *
*=========================================================================*/
PRIVATE long Vesa_Set_Mode(long mode)
{
union REGS regs;
struct SREGS sregs;
/* Get mode info */
if ( Vesa_Get_Mode_Info(mode) ) return (-1) ;
if ((ModeInfo.Attributes & 0x01) == 0) return (-1);
/* Set vesa VIDEO MODE */
regs . x . eax = 0x4F02; //
regs . x . ebx = mode;
int386 ( 0x10 , & regs , & regs ) ;
// delay ( 1000 ) ;
if ( VInfo . Capabilities & 1 )
{
/* Set DAC to 6 bit per color register */
regs . x . eax = 0x4F08;
regs . h . bl = 0;
regs . h . bh = 6 ;
int386 ( 0x10 , & regs , & regs ) ;
// delay ( 1000 ) ;
}
regs . x . eax &= 0xffff ;
if ( regs . x . eax != 0x004F) return (-1);
Init_Bank_Table();
return (0);
}
/***************************************************************************
* VESA_XRES -- Returns horizontal resolution of vesa mode *
* *
* INPUT: none *
* *
* OUTPUT: long - the horizontal resolution of vesa mode *
* *
* WARNINGS: You must call Install_Vesa and Vesa_Set_Mode before calling *
* Vesa_XRes(). *
* *
* HISTORY: *
* 11/21/1994 PWG : Created. *
*=========================================================================*/
long Vesa_XRes(void)
{
return ((long)ModeInfo.XRes);
}
/***************************************************************************
* VESA_YRES -- Returns vertical resolution of a vesa mode *
* *
* INPUT: none *
* *
* OUTPUT: long - the horizontal resolution of vesa mode *
* *
* WARNINGS: You must call Install_Vesa and Vesa_Set_Mode before calling *
* Vesa_XRes(). *
* *
* HISTORY: *
* 11/21/1994 PWG : Created. *
*=========================================================================*/
long Vesa_YRes(void)
{
return ((long)ModeInfo.YRes);
}
/***************************************************************************
* INIT_BANK_TABLE -- Initializes the values in the bank table *
* *
* INPUT: none *
* *
* OUTPUT: none *
* *
* HISTORY: *
* 12/02/1994 PWG : Created. *
*=========================================================================*/
PRIVATE void Init_Bank_Table(void)
{
long size,bankval;
int num_banks,lp;
union REGS regs;
struct SREGS sregs;
size = Vesa_XRes() * Vesa_YRes(); // get video mode size
num_banks = size / 65536; // get number of banks
if (size % 65536) // adjust number of banks if
num_banks++; // they dont break evenly
bankval = 64 / ModeInfo.WinGranularity;
VesaFunc = ModeInfo.WinFunc;
for (lp = 0; lp < num_banks; lp++)
BankTable[lp] = lp * bankval;
regs . x . eax = 0x4F05; // Reset Vesa to Point to Bank 0
regs . x . ebx = 0x0000;
regs . x . edx = 0x0000;
int386 ( 0x10 , & regs , & regs ) ;
}
/***************************************************************************
* SET_MODE -- Used to set a graphic mode *
* *
* INPUT: int - the mode that we are setting *
* *
* OUTPUT: int - FALSE if failure, TRUE otherwise *
* *
* HISTORY: *
* 11/21/1994 PWG : Created. *
*=========================================================================*/
int Set_Video_Mode(int mode)
{
union REGS inregs,outregs;
static first_time = 0 ;
int oldmode ;
/*======================================================================*/
/* If this is the first time we have set the mode we need to store */
/* of the original mode. */
/*======================================================================*/
if ( ! first_time ) {
first_time = 1 ;
Set_Original_Video_Mode(Get_Video_Mode());
}
/*======================================================================*/
/* If the mode we are trying to set is mode zero than we are actually */
/* trying to restore the system to its original video mode. */
/*======================================================================*/
if (mode == RESET_MODE)
mode = Get_Original_Video_Mode(); // set mode properly
if (mode == GraphicMode) // if mode already correct
return(TRUE); // get out of here
oldmode = GraphicMode ;
GraphicMode = mode ;
/**********************************************************************/
/* make sure the mouse is term off before any change */
/*********************************************************************/
if ( MInstalled == TRUE ) Hide_Mouse () ;
/* clear color palette */
memset ( CurrentPalette , 255 , sizeof ( CurrentPalette ) ) ;
memset ( PaletteTable , 0 , sizeof ( PaletteTable ) ) ;
/*======================================================================*/
/* If we are currently in a vesa mode, free it up so that we can do it */
/* again. */
/*======================================================================*/
if ((oldmode >= VESA_MIN) && (oldmode <= VESA_MAX))
Remove_Vesa();
/*======================================================================*/
/* If we are requesting a vesa mode, than use the vesa calls to handle */
/* it. */
/*======================================================================*/
if ( GraphicMode >= VESA_MIN && GraphicMode <= VESA_MAX)
{
inregs . x . eax = MCGA_MODE;
int386 ( 0x10 , &inregs , &outregs);
// delay ( 1000 ) ;
if ( Install_Vesa () != 0 ) {
Set_Video_Mode(oldmode);
return(FALSE);
}
if (Vesa_Set_Mode(GraphicMode) != 0)
{
Set_Video_Mode(oldmode);
return(FALSE);
}
XRes = Vesa_XRes();
YRes = Vesa_YRes();
Set_HiRes_Function_Pointers();
}
else
{
/*===================================================================*/
/* If not a vesa mode, then handle that as well. */
/*===================================================================*/
inregs . x . eax = GraphicMode ;
int386( 0x10, &inregs, &outregs);
// delay ( 1000 ) ;
if ( GraphicMode == MCGA_MODE ) {
XRes = 320;
YRes = 200;
Set_LoRes_Function_Pointers();
}
}
if ( MInstalled == TRUE ) {
Reset_Mouse () ;
Show_Mouse () ;
}
return(TRUE);
}
/***************************************************************************
* VESA_INFO -- Debug routine which displays vesa info to stdout *
* *
* INPUT: none *
* *
* OUTPUT: none *
* *
* WARNINGS: Must call Install_Vesa before attempting to get the vesa *
* info. *
* *
* HISTORY: *
* 11/22/1994 PWG : Created. *
*=========================================================================*/
void Vesa_Info(void)
{
cout << "Attributes: " << (long)ModeInfo.Attributes << "\n"
<< "Win A Attributes: " << (long)ModeInfo.WinA_Attributes << "\n"
<< "Win B Attributes: " << (long)ModeInfo.WinB_Attributes << "\n"
<< "Win Granularity " << (long)ModeInfo.WinGranularity << "\n"
<< "Win Size: " << (long)ModeInfo.WinSize << "\n"
<< "Win A Segment: " << hex << (unsigned short)ModeInfo.WinA_Segment << "\n"
<< "Win B Segment: " << (unsigned short)ModeInfo.WinB_Segment << "\n"
<< "Bytes per scan line: " << dec << (unsigned short)ModeInfo.BytesPerScanline << "\n"
<< "X resolution: " << (long)ModeInfo.XRes << "\n"
<< "Y resolution: " << (long)ModeInfo.YRes << "\n"
<< "X Char Size: " << (long)ModeInfo.XCharSize << "\n"
<< "Y Char Size: " << (long)ModeInfo.YCharSize << "\n"
<< "Number of planes: " << (long)ModeInfo.NumPlanes << "\n"
<< "Bits per pixels: " << (long)ModeInfo.BitsPerPixel << "\n"
<< "Number of Banks: " << (long)ModeInfo.NumBanks << "\n"
<< "Memory Model: " << (long)ModeInfo.MemoryModel << "\n"
<< "Bank Size: " << (long)ModeInfo.BankSize << "\n";
}
/***************************************************************************
* VESA_SET_WINDOW -- Sets given vesa window to given grain *
* *
* INPUT: int window - 0 for window A, 1 for window B *
* int grain - the granularity point for window *
* *
* OUTPUT: none *
* *
* HISTORY: *
* 12/05/1994 PWG : Created. *
*=========================================================================*/
void Vesa_Set_Window(long grain_num)
{
union REGS regs;
struct SREGS sregs;
regs . x . eax = 0x4f05 ;
regs . x . ebx = 0 ;
regs . x . edx = grain_num;
// DPMI_real_call ( ModeInfo.WinFunc , & regs , & sregs ) ;
DPMI_real_intr ( VesaFunc , & regs , & sregs ) ;
}
/***************************************************************************
* SET_LORES_FUNCTION_POINTERS -- Sets up the lowres function pointers *
* *
* INPUT: *
* *
* OUTPUT: *
* *
* WARNINGS: *
* *
* HISTORY: *
* 01/12/1995 PWG : Created. *
*=========================================================================*/
PRIVATE VOID Set_LoRes_Function_Pointers(VOID)
{
VVPC_Clear_Func = MCGA_Clear;
VVPC_To_Buffer_Func = MCGA_To_Buffer;
VVPC_Put_Pixel_Func = MCGA_Put_Pixel;
VVPC_Get_Pixel_Func = MCGA_Get_Pixel;
GVPC_Blit_to_VVPC_Func = Linear_Blit_To_Linear;
VVPC_Blit_to_GVPC_Func = Linear_Blit_To_Linear;
VVPC_Blit_to_VVPC_Func = Linear_Blit_To_Linear;
VVPC_Buffer_To_Page = MCGA_Buffer_To_Page;
GVPC_Scale_To_VVPC = Linear_Scale_To_Linear;
VVPC_Scale_To_GVPC = Linear_Scale_To_Linear;
VVPC_Scale_To_VVPC = Linear_Scale_To_Linear;
VVPC_Print_Func = MCGA_Print;
}
/***************************************************************************
* SET_HIRES_FUNCTION_POINTERS -- Sets the HiRes function pointers *
* *
* INPUT: *
* *
* OUTPUT: *
* *
* WARNINGS: *
* *
* HISTORY: *
* 01/12/1995 PWG : Created. *
*=========================================================================*/
PRIVATE VOID Set_HiRes_Function_Pointers(VOID)
{
VVPC_Clear_Func = Vesa_Clear;
VVPC_To_Buffer_Func = Vesa_To_Buffer;
VVPC_Put_Pixel_Func = Vesa_Put_Pixel;
VVPC_Get_Pixel_Func = Vesa_Get_Pixel;
GVPC_Blit_to_VVPC_Func = Linear_Blit_To_Vesa;
VVPC_Blit_to_GVPC_Func = Vesa_Blit_To_Linear;
VVPC_Blit_to_VVPC_Func = Vesa_Blit_To_Vesa;
VVPC_Buffer_To_Page = Vesa_Buffer_To_Page;
GVPC_Scale_To_VVPC = Linear_Scale_To_Vesa;
VVPC_Scale_To_GVPC = Vesa_Scale_To_Linear;
VVPC_Scale_To_VVPC = Vesa_Scale_To_Vesa;
VVPC_Print_Func = Vesa_Print;
}
/***************************************************************************
* Update_Video_Mode -- used to reprogram the current graphic mode afte *
* a task swicthing from windows *
* *
* INPUT: *
* *
* OUTPUT: *
* *
* HISTORY: *
* 03/18/94 JRJ : Created. *
*=========================================================================*/
void Update_Video_Mode (void)
{
union REGS inregs,outregs;
/* clear color palette */
memset ( CurrentPalette , 255 , sizeof ( CurrentPalette ) ) ;
memset ( PaletteTable , 0 , sizeof ( PaletteTable ) ) ;
/**********************************************************************/
/* make sure the mouse is term off before any change */
/*********************************************************************/
if ( MInstalled == TRUE )
Hide_Mouse () ;
/*======================================================================*/
/* If we are requesting a vesa mode, than use the vesa calls to handle */
/* it. */
/*======================================================================*/
if ( GraphicMode >= VESA_MIN && GraphicMode <= VESA_MAX) {
inregs . x . eax = MCGA_MODE;
int386 ( 0x10 , &inregs , &outregs);
Vesa_Set_Mode(GraphicMode);
}
else {
/*===================================================================*/
/* If not a vesa mode, then handle that as well. */
/*===================================================================*/
inregs . x . eax = GraphicMode ;
int386( 0x10, &inregs, &outregs);
}
if ( MInstalled == TRUE ) {
Reset_Mouse () ;
Show_Mouse () ;
}
}
/***************************************************************************
* SET_ORIGINAL_VIDEO_MODE -- sets mode to restore system to on exit *
* *
* INPUT: int video mode number *
* *
* OUTPUT: none *
* *
* HISTORY: *
* 06/29/1995 PWG : Created. *
*=========================================================================*/
void Set_Original_Video_Mode(int mode)
{
_OriginalVideoMode = mode;
}
/***************************************************************************
* GET_ORIGINAL_VIDEO_MODE -- Gets the original video mode value *
* *
* INPUT: none *
* *
* OUTPUT: int the video mode set when we entered *
* *
* HISTORY: *
* 06/29/1995 PWG : Created. *
*=========================================================================*/
int Get_Original_Video_Mode(void)
{
return(_OriginalVideoMode);
}