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/*
Copyright (C) 1994-1995 Apogee Software, Ltd.
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 2
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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
//***************************************************************************
//
// MODEXLIB.C - various utils palette funcs and modex stuff
//
//***************************************************************************
#ifndef _modexlib_public
#define _modexlib_public
#include "rt_def.h"
#define MAXSCREENHEIGHT 200
#define MAXSCREENWIDTH 320
#define SCREENBWIDE 96
#define MAXVIEWWIDTH 320
#define SCREENWIDTH 96 // default screen width in bytes
//***************************************************************************
//
// Video (ModeX) Constants
//
//***************************************************************************
#define SC_INDEX 0x3C4
#define SC_DATA 0x3C5
#define SC_RESET 0
#define SC_CLOCK 1
#define SC_MAPMASK 2
#define SC_CHARMAP 3
#define SC_MEMMODE 4
#define CRTC_INDEX 0x3D4
#define CRTC_DATA 0x3D5
#define CRTC_H_TOTAL 0
#define CRTC_H_DISPEND 1
#define CRTC_H_BLANK 2
#define CRTC_H_ENDBLANK 3
#define CRTC_H_RETRACE 4
#define CRTC_H_ENDRETRACE 5
#define CRTC_V_TOTAL 6
#define CRTC_OVERFLOW 7
#define CRTC_ROWSCAN 8
#define CRTC_MAXSCANLINE 9
#define CRTC_CURSORSTART 10
#define CRTC_CURSOREND 11
#define CRTC_STARTHIGH 12
#define CRTC_STARTLOW 13
#define CRTC_CURSORHIGH 14
#define CRTC_CURSORLOW 15
#define CRTC_V_RETRACE 16
#define CRTC_V_ENDRETRACE 17
#define CRTC_V_DISPEND 18
#define CRTC_OFFSET 19
#define CRTC_UNDERLINE 20
#define CRTC_V_BLANK 21
#define CRTC_V_ENDBLANK 22
#define CRTC_MODE 23
#define CRTC_LINECOMPARE 24
#define GC_INDEX 0x3CE
#define GC_DATA 0x3CF
#define GC_SETRESET 0
#define GC_ENABLESETRESET 1
#define GC_COLORCOMPARE 2
#define GC_DATAROTATE 3
#define GC_READMAP 4
#define GC_MODE 5
#define GC_MISCELLANEOUS 6
#define GC_COLORDONTCARE 7
#define GC_BITMASK 8
#define ATR_INDEX 0x3c0
#define ATR_MODE 16
#define ATR_OVERSCAN 17
#define ATR_COLORPLANEENABLE 18
#define ATR_PELPAN 19
#define ATR_COLORSELECT 20
#define STATUS_REGISTER_1 0x3da
#define PEL_WRITE_ADR 0x3c8
#define PEL_READ_ADR 0x3c7
#define PEL_DATA 0x3c9
extern int ylookup[MAXSCREENHEIGHT]; // Table of row offsets
extern int linewidth;
extern int page1start;
extern int page2start;
extern int page3start;
extern int screensize;
extern unsigned bufferofs;
extern unsigned displayofs;
extern boolean graphicsmode;
void GraphicsMode ( void );
void SetTextMode ( void );
void VL_SetVGAPlaneMode ( void );
void VL_ClearBuffer (unsigned buf, byte color);
void VL_ClearVideo (byte color);
void VL_DePlaneVGA (void);
void VL_CopyDisplayToHidden ( void );
void VL_CopyBufferToAll ( unsigned buffer );
void VL_CopyPlanarPage ( byte * src, byte * dest );
void VL_CopyPlanarPageToMemory ( byte * src, byte * dest );
void XFlipPage ( void );
void WaitVBL( void );
void TurnOffTextCursor ( void );
#ifdef __WATCOMC__
#pragma aux VGAWRITEMAP = \
"mov eax,01H" \
"mov edx,03c5h" \
"shl eax,cl" \
"out dx,al" \
parm [ecx] \
modify exact [eax edx]
#pragma aux VGAMAPMASK = \
"mov edx,03c5h" \
"out dx,al" \
parm [eax] \
modify exact [edx]
#pragma aux VGAREADMAP = \
"shl eax,08H" \
"mov edx,03ceh" \
"add eax,04H" \
"out dx,ax" \
parm [eax] \
modify exact [eax edx]
#endif
#ifdef DOS
void VGAMAPMASK (int x);
void VGAREADMAP (int x);
void VGAWRITEMAP(int x);
#else
#define VGAMAPMASK(a)
#define VGAREADMAP(a)
#define VGAWRITEMAP(a)
#endif
#endif
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