/*
Copyright (C) 1996-1997 Id Software, 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 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.

*/
// vid_dos.h: header file for DOS-specific video stuff

typedef struct vmode_s {
  struct vmode_s  *pnext;
  char    *name;
  char    *header;
  unsigned  width;
  unsigned  height;
  float   aspect;
  unsigned  rowbytes;
  int     planar;
  int     numpages;
  void    *pextradata;
  int     (*setmode)(viddef_t *vid, struct vmode_s *pcurrentmode);
  void    (*swapbuffers)(viddef_t *vid, struct vmode_s *pcurrentmode,
                 vrect_t *rects);
  void    (*setpalette)(viddef_t *vid, struct vmode_s *pcurrentmode,
                unsigned char *palette);
  void    (*begindirectrect)(viddef_t *vid, struct vmode_s *pcurrentmode,
                   int x, int y, byte *pbitmap, int width,
                   int height);
  void    (*enddirectrect)(viddef_t *vid, struct vmode_s *pcurrentmode,
                 int x, int y, int width, int height);
} vmode_t;

// vid_wait settings
#define VID_WAIT_NONE     0
#define VID_WAIT_VSYNC      1
#define VID_WAIT_DISPLAY_ENABLE 2

extern int    numvidmodes;
extern vmode_t  *pvidmodes;

extern int    VGA_width, VGA_height, VGA_rowbytes, VGA_bufferrowbytes;
extern byte   *VGA_pagebase;
extern vmode_t  *VGA_pcurmode;

extern cvar_t vid_wait;
extern cvar_t vid_nopageflip;
extern cvar_t _vid_wait_override;

extern unsigned char colormap256[32][256];

extern void *vid_surfcache;
extern int  vid_surfcachesize;

void VGA_Init (void);
void VID_InitVESA (void);
void VID_InitExtra (void);
void VGA_WaitVsync (void);
void VGA_ClearVideoMem (int planar);
void VGA_SetPalette(viddef_t *vid, vmode_t *pcurrentmode, unsigned char *pal);
void VGA_SwapBuffersCopy (viddef_t *vid, vmode_t *pcurrentmode,
  vrect_t *rects);
qboolean VGA_FreeAndAllocVidbuffer (viddef_t *vid, int allocnewbuffer);
qboolean VGA_CheckAdequateMem (int width, int height, int rowbytes,
  int allocnewbuffer);
void VGA_BeginDirectRect (viddef_t *vid, struct vmode_s *pcurrentmode, int x,
  int y, byte *pbitmap, int width, int height);
void VGA_EndDirectRect (viddef_t *vid, struct vmode_s *pcurrentmode, int x,
  int y, int width, int height);
void VGA_UpdateLinearScreen (void *srcptr, void *destptr, int width,
  int height, int srcrowbytes, int destrowbytes);