Category : C Source Code
Archive   : DBPCXL18.ZIP
Filename : VESA.H

/* vesa.h */
/* Copyright (c) 1992, 1993 Dave Boynton */

#ifndef __VESALIB__
#define __VESALIB__

#ifndef __VIDLIB__
unsigned int _screen_width;
unsigned int _screen_length;
char *_screen_start;
#endif

/* VESA mode values */
#define VM_640x400x256 0x0100
#define VM_640x480x256 0x0101
#define VM_800x600x16 0x0102
#define VM_800x600x256 0x0103
#define VM_1024x768x16 0x0104
#define VM_1024x768x256 0x0105
#define VM_1280x1024x16 0x0106
#define VM_1280x1024x256 0x0107
#define VM_80x60 0x0108
#define VM_132x25 0x0109
#define VM_132x43 0x010a
#define VM_132x50 0x010b
#define VM_132x60 0x010c
#define VM_320x200x32K 0x010d
#define VM_320x200x64K 0x010e
#define VM_320x200x16M 0x010f
#define VM_640x480x32K 0x0110
#define VM_640x480x64K 0x0111
#define VM_640x480x16M 0x0112
#define VM_800x600x32K 0x0113
#define VM_800x600x64K 0x0114
#define VM_800x600x16M 0x0115

#define MAX_ROWS 1024
/* modes with more that 1024 rows aren't supported */
#define MAX_MEMORYBLK 32
/* in 64k blocks, or 2meg */
#define MAX_PAGES 256
/* 4k pages * 256 = 1meg, or 2meg cards w/4k pages are bad */


/* Vminfo.modeattr values */
#define VA_DISPLAY_OK 0x0001
#define VA_OPTIONAL_OK 0x0002
#define VA_BIOSTEXT_OK 0x0004
#define VA_COLOR_OK 0x0008
#define VA_GRAPH_OK 0x0010

/* Vminfo.Window?attr values */
#define VW_SUPPORTED 0x01
#define VW_READABLE 0x02
#define VW_WRITABLE 0x04

/* state buffer values */
#define VS_HARDWARE 0x0001
#define VS_BIOS 0x0002
#define VS_DAC 0x0004
#define VS_SVGA 0x0008

struct vesainfo {
char signature[4]; /* shoud be "VESA" */
unsigned char minor_version;
unsigned char major_version;
char * OEMinfo; /* 4 byte */
char capabilities[4];
int * modeptr; /* 4 byte */
unsigned int TotalMemory; /* number of 64k blocks, v1.1+ */
char Reserved[236]; /* info calls always need 256 bytes */
};

typedef enum { text, cga, herc, four_plane, packed_pixel, nonchain_256,
direct, YUV, reserved } mode_type;

struct vesamodeinfo {
int modeattr;
char WindowAattr;
char WindowBattr;
int granularity;
int size;
unsigned int Asegment;
unsigned int Bsegment;
void (*SetWindowFunction)(void);
unsigned int bytesperline;

/* optional information (when bit 1 of modeattr is set) */
/* mandatory under VBE 1.2 */

int XPixels;
int YPixels;
char charwidth;
char charlength;
char planes;
char bits;
char banks; /* CGA/Herc */
char memorymodel; /* use mode_type */
char banksize; /* in k bytes */
char NumberOfImagePages; /* v1.1 only */
char ReservedB;

/* following valid under 1.2 for direct color and YUV modes */
char RedMaskSize;
char RedFieldPosition;
char GreenMaskSize;
char GreenFieldPosition;
char BlueMaskSize;
char BlueFieldPosition;
char RsvdMaskSize;
char RsvdFieldPosition;
char DirectColorModeInfo;

char Reserved[216];
};

struct tagBreakEntry {
int Row, Col;
};

struct tagRowEntry {
int Page; /* page of row at column 0 */
unsigned int Offset; /* offset into screen at start of row */
int BreakColumn; /* column of break, or -1 if no break */
int reserved;
};

#ifdef VESA
struct vesainfo Vinfo;
struct vesamodeinfo Vminfo;
int vesareadpage, vesawritepage;
int vesapager=-1;
int vesapagew=-1;
unsigned int Vnext_break_rowr;
unsigned int Vnext_break_colr;
unsigned int Vnext_break_roww;
unsigned int Vnext_break_colw;
unsigned long _window_size;
int _bytesperpixel;
struct tagBreakEntry * _BreakTable=NULL;
struct tagRowEntry * _RowTable=NULL;
void (*VESAsetpageptr)(char window, unsigned page);
#else
extern struct vesainfo Vinfo;
extern struct vesamodeinfo Vminfo;
extern int vesareadpage, vesawritepage;
extern unsigned int vesapager, vesapagew;
extern unsigned int Vnext_break_rowr;
extern unsigned int Vnext_break_colr;
extern unsigned int Vnext_break_roww;
extern unsigned int Vnext_break_colw;
extern unsigned long _window_size;
extern int _bytesperpixel;
extern struct tagBreakEntry * _BreakTable;
extern struct tagRowEntry * _RowTable;
extern void (*VESAsetpageptr)(char window, unsigned page);
#endif

/* If compiling under TurboC++, make sure it knows how to link. */
#ifdef _cplusplus
extern "C" {
#endif

void VESAinit(void); /* calls Vinit() */
void VESAclose(void); /* calls Vclose() */
int VESAmode(unsigned int mode, char *palette);
int isVESA(void); /* 1=VESA ok., 0=no VESA */
/* see if a VESA mode is valid */
int isVESAmode(int mode); /* find an acceptable mode
returns -1 on not valid,
mode_type if o.k. */

struct vesainfo *getVESAinfo(void);
struct vesamodeinfo *getVESAmodeinfo(unsigned int mode,
struct vesamodeinfo *modebuffer);

/* new functions in VBE v1.1 */
unsigned int VESAGetLogicalLineLen(void);
unsigned int VESASetLogicalLineLen(unsigned int length);
unsigned int VESASetDisplayStart(unsigned int column, unsigned int row);
unsigned int VESAGetDisplayStart(void);

/* new functions in VBE v1.2 */
int VESAGetDACPaletteControl(void);
int VESASetDACPaletteControl(int bits);

/* local stuff */
long Vabsolute_offset(int r,int c);
int VESAwhat_page(int r,int c);
unsigned int VESAwhat_offset(int r,int c);


void VESAsetpager(unsigned page);
void VESAsetpagew(unsigned page);

int VESAfill256(unsigned dx, unsigned dy,
unsigned sdx, unsigned sdy,
unsigned color);
int VESAcopy256(unsigned dx, unsigned dy,
unsigned sx, unsigned sy,
unsigned sdx, unsigned sdy);
int VESAdisp256(unsigned dx, unsigned dy,
char *s, unsigned sw, unsigned sl,
unsigned sx, unsigned sy,
unsigned sdx, unsigned sdy, int direction);
int VESAcapt256(char *d, unsigned dw, unsigned dl,
unsigned dx, unsigned dy,
unsigned sx, unsigned sy,
unsigned sdx, unsigned sdy, int direction);
void VESAhline(int x1, int x2, int y, unsigned int color);
void VESAvline(int x, int y1, int y2, unsigned int color);

/* low level routine to copy part of one line, checking for destination
breaks (doesn't check for source breaks) */
int _VESAcopylinePP(int dx, int dy, char *src, int sdx, int bytesperpixel);
int _VESAcopyline8PP(int dx, int dy, char *src, int sdx);

void VESAhlinePP(int x1, int x2, int y, unsigned long color, int bytesperpixel);
void VESAvlinePP(int x, int y1, int y2, unsigned long color, int bytesperpixel);

int VESAfillPP(unsigned dx, unsigned dy,
unsigned sdx, unsigned sdy,
unsigned color, int bytesperpixel);
int VESAcopyPP(unsigned dx, unsigned dy,
unsigned sx, unsigned sy,
unsigned sdx, unsigned sdy, int bytesperpixel);
int VESAdispPP(unsigned dx, unsigned dy,
char *s, unsigned sw, unsigned sl,
unsigned sx, unsigned sy,
unsigned sdx, unsigned sdy, int direction,
int bytesperpixel);
int VESAcaptPP(char *d, unsigned dw, unsigned dl,
unsigned dx, unsigned dy,
unsigned sx, unsigned sy,
unsigned sdx, unsigned sdy, int direction,
int bytesperpixel);
void VESAWriteDot8PP(unsigned dx, unsigned dy,
unsigned char color);
void VESAWriteDot16PP(unsigned dx, unsigned dy,
unsigned int color);
void VESAWriteDot24PP(unsigned dx, unsigned dy,
unsigned long color); /* True Color! */

int VESAcopy16(unsigned dx, unsigned dy,
unsigned sx, unsigned sy,
unsigned sdx, unsigned sdy);

int VESAdisp16(unsigned dx, unsigned dy,
char *s, unsigned sw, unsigned sl,
unsigned sx, unsigned sy,
unsigned sdx, unsigned sdy);
int VESAcapt16(char *d, unsigned dw, unsigned dl,
unsigned dx, unsigned dy,
unsigned sx, unsigned sy,
unsigned sdx, unsigned sdy);

#ifdef _cplusplus
}
#endif



#endif