/*
 * $Source: x:/prj/tech/libsrc/dev2d/RCS/grd.c $
 * $Revision: 1.9 $
 * $Author: KEVIN $
 * $Date: 1998/03/26 10:40:02 $
 *
 * Global stuff.
 *
 * This file is part of the dev2d library.
 */

#ifdef __WATCOMC__
#include <dpmi.h>
#endif

#include <grs.h>


int gdd_active = 0;                    /* flag for whether dev2d system has been fired up. */

grs_sys_info grd_info;                 /* info for current graphics setup. */
int grd_mode=-1;                       /* currently active graphics mode. -1 means unrecognized mode */
grs_drvcap grd_mode_cap;
grs_drvcap *grd_cap = &grd_mode_cap;   /* capability info for currently set driver. */

int grd_valloc_mode=0;                 /* Indicates video memory allocation method */
int grd_screen_row;                    /* number of bytes per scanline in current screen mode */
int grd_screen_bmt;                    /* bitmap type of current screen mode */
int grd_screen_max_height;             /* maximum height of a bitmap using video memory */

grs_screen *grd_screen=NULL;           /* pointer to the currently set screen. */
grs_canvas *grd_screen_canvas;         /* pointer to a canvas for the current virtual screen. */
grs_canvas *grd_visible_canvas;        /* pointer to a canvas for the visible sub-region of the virtual screen. */
grs_canvas *grd_back_canvas;           /* pointer to a canvas for the invisible sub-region of the virtual screen. */

/* pointer to palette */
uchar grd_default_pal[768];
uchar *grd_pal=grd_default_pal;

/* pointer to inverse palette */
uchar *grd_ipal=NULL;

/* translucency data */
uchar *tluc8tab_data[256];
uchar **tluc8tab = tluc8tab_data;

/* pointer to currently set canvas. */
grs_canvas *grd_canvas;

/* pointer to start of current device driver's function table. */
void (**grd_device_table)();

/* pointers to canvas tables. */
void (**gdd_flat8_canvas_table)();
void (**gdd_flat16_canvas_table)();
void (**gdd_flat24_canvas_table)();
void (**gdd_bank8_canvas_table)();
void (**gdd_bank16_canvas_table)();
void (**gdd_bank24_canvas_table)();
void (**gdd_modex_canvas_table)();
void (**gdd_dispdev_canvas_table)();

/* pointer to start of current bitmap driver's function table for clipped
   primitives. */
void (**gdd_canvas_table)();

/* flag for whether we are executing in an interrupt. */
bool grd_interrupt=0;

/* global location to store data for dpmi calls */
#ifdef __WATCOMC__
dpmis_reg dpmi_reg_data;
#endif

/* default graphics context */
grs_context grd_defgc;

/* more palette crap */
uchar grd_gamma_table[256]= {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff,
};
grs_rgb grd_default_bpal[256];
grs_rgb *grd_bpal=grd_default_bpal;

ushort **grd_ltab816_list=NULL;
ushort *grd_ltab816=NULL;
uchar *grd_light_table;
int grd_light_table_size=15;
uchar *grd_unpack_buf=NULL;
uint grd_unpack_buf_size=-1;
void *pixpal;
uint grd_chroma_key=0;

/* video capability detection function for use by gd_init() */
int (*gdd_detect_func)(grs_sys_info *info) = NULL;

uchar gdd_light_buffer[1024];
