0,0 → 1,88 |
/* |
* Video routines used by the SvarDOS installer |
* Copyright (C) 2016 Mateusz Viste |
* |
* All video routines output data directly to VRAM, and they all do that |
* to both B8000:0000 and B0000:0000 areas simulteanously, for compatibility |
* with all possible video adapters in all possible modes. |
*/ |
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#include <dos.h> |
#include "video.h" /* include self for control */ |
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/* pointer to the VGA/MDA screen */ |
static unsigned short far *scr = (unsigned short far *)0xB8000000L; |
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void video_clear(unsigned short attr, int offset, int offsetend) { |
offsetend += 2000; |
while (offset < offsetend) scr[offset++] = attr; |
} |
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/* inits screen, returns 0 for color mode, 1 for mono */ |
int video_init(void) { |
union REGS r; |
int monoflag; |
/* get current video mode to detect color (7 = mono, anything else is color) */ |
r.h.ah = 0x0F; |
int86(0x10, &r, &r); |
/* set the monoflag to detected value and prepare the next mode we will set */ |
if (r.h.al == 7) { |
monoflag = 1; |
r.h.al = 7; /* 80x25 2 colors (MDA / Hercules) */ |
scr = (unsigned short far *)0xB0000000L; |
} else if (r.h.al == 2) { /* 80x25 grayscale */ |
monoflag = 1; |
r.h.al = 2; /* 80x25 grayscale */ |
scr = (unsigned short far *)0xB8000000L; |
} else { |
monoflag = 0; |
r.h.al = 3; /* 80x25 16 colors */ |
scr = (unsigned short far *)0xB8000000L; |
} |
/* (re)set video mode to be sure what we are dealing with */ |
r.h.ah = 0; |
int86(0x10, &r, &r); |
return(monoflag); |
} |
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void video_putchar(int y, int x, unsigned short attr, int c) { |
scr[(y << 6) + (y << 4) + x] = attr | c; |
} |
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void video_putcharmulti(int y, int x, unsigned short attr, int c, int repeat, int step) { |
int offset = (y << 6) + (y << 4) + x; |
while (repeat-- > 0) { |
scr[offset] = attr | c; |
offset += step; |
} |
} |
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void video_putstring(int y, int x, unsigned short attr, const char *s, int maxlen) { |
if (x < 0) { /* means 'center out' */ |
int slen; |
for (slen = 0; s[slen] != 0; slen++); /* faster than strlen() */ |
x = 40 - (slen >> 1); |
} |
x += (y << 6) + (y << 4); /* I use x as an offset now */ |
while ((*s != 0) && (maxlen-- != 0)) { |
scr[x++] = attr | *s; |
s++; |
} |
} |
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void video_putstringfix(int y, int x, unsigned short attr, const char *s, int w) { |
x += (y << 6) + (y << 4); /* I use x as an offset now */ |
while (w-- > 0) { |
scr[x++] = attr | *s; |
if (*s != 0) s++; |
} |
} |
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void video_movecursor(int y, int x) { |
union REGS r; |
r.h.ah = 2; |
r.h.bh = 0; |
r.h.dh = y; |
r.h.dl = x; |
int86(0x10, &r, &r); |
} |