/*
	    G R A F I X . H


    To use this package, make sure that your main() has the following
    include definitions:

	#include <dos.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <math.h>

    These are needed by the routines which call the BIOS ROM in the
    IBM-PC and compatables.  These routines will only work on the IBM-PC
    or compatables; and are recommended for use only with Microsoft 'C'
    Version 4.00 or later running under MS-DOS 3.10 or later.
*/

/*
		H E X   C O N S T A N T S
*/

#define ROM_BIOS       0x10     /* INT 10H calls the IBM-PC ROM
                                   BIOS video driver services       */

#define DOS_INT        0x21     /* MS-DOS Int. 21h service call */

#define PRN_OUTPUT     0x05     /* Function 05h sends output to PRN: */

#define SET_VI_MODE    0x00     /* Function 00h sets the video mode
                                   calls.                           */

#define SET_PALETTE    0x0B     /* Function 0Bh sets the color
                                   palette for 320 X 200 medium-res */

#define WRITE_PIXEL    0x0C     /* Function 0Ch writes a pixel at
                                   location specified by CX & DX    */

#define READ_PIXEL     0x0D     /* Function 0Dh reads the value of
                                   a graphics pixel at location
                                   specified by CX & DX             */

#define GET_DIS_MODE   0x0F     /* Function 0Fh gets the current
                                   display mode and saves all the
                                   relevant information.            */

#define SELECT_PAGE    0x05     /* Function 05h selects the current
                                   active display page              */

/*
		F U N C T I O N   D E C L A R A T I O N S
*/

extern void get_mode (void);
extern void set_mode (int);
extern void set_palette (int);
extern void set_background (int);
extern void plot_point (int, int, int);
extern void set_page (int);
extern void save_pic (char *);
extern void load_pic (char *);
extern int  read_point (int, int);
extern void print_pic (void);
extern void prn_out (int);

/*
		V A R I A B L E   D E C L A R A T I O N S
*/

union REGS inregs, outregs;
struct SREGS segregs;

extern char P_BUFFER[200];

extern int bits[8];

extern int  CURRENT_PAGE,              /* Returned by get_mode() */
	    CURRENT_MODE,              /* Returned by get_mode() */
	    PALETTE,                   /* Set by set_palette(Palette) */
	    BACKGROUND,                /* Set by set_background(Background) */
	    USE_MODE;                  /* Set by set_mode(Mode) */

/* Palette = 1 or 0 when used with CGA modes 4 and 5 */
/* Background = 1 - 16 when used with CGA modes 4 or 5 */
/* Mode = 0 - 16 for various text and graphics displays.
          Only Modes 0-6 are supported currently.

    0 = 40 x 25 B/W text, Color Adapter
    1 = 40 x 25 Color Text
    2 = 80 x 25 B/W Text
    3 = 80 x 25 Color Text
    4 = 320 x 200 4-Color Graphics
    5 = 320 x 200 4-Color Graphics (One color only)
    6 = 640 x 200 2-Color Graphics
*/