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cga.cpp
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cga.cpp
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#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <math.h>
#include "image.h"
#include "types.h"
#include "memory.h"
#include "cga.h"
#ifdef __GNUC__
#include <iostream>
using namespace std;
#endif
/* mode, width, height, bytes_per_line, base_addr, bpp, Bpp, colors, vsync_reg, scale */
const adapter::video_mode cga::video_modes[] = {
{TEXT,80,25,80,0xb800,8,8,0xF,0x3da,0},
{CGALO1,320,200,80,0xb800,2,8,0xF,0x3da,0},
{CGALO2,320,200,80,0xb800,2,8,0xF,0x3da,0},
{CGAHI,640,200,80,0xb800,1,8,0xF,0x3da,0},
{X16,160,100,160,0xb800,1,8,0xF,0x3da,4}
};
cga::cga(void)
{
_savedvmode = getmode();
pal_reg.reg=0;
}
cga::~cga(void)
{
setmode(_savedvmode);
}
bool cga::setup(void)
{
for (unsigned long int i=0;i<sizeof(video_modes);i++) {
if (video_modes[i].mode == _vmode) {
_row_bytes = video_modes[i].bytes;
_width = video_modes[i].x;
_height = video_modes[i].y;
bpp = video_modes[i].bpp;
Bpp = 8/bpp;
planes = video_modes[i].planes;
colors = video_modes[i].colors;
SR = video_modes[i].sr;
buf_size = _row_bytes*_height;
#ifdef __BORLANDC__
_buffer = (unsigned char far *) MK_FP(video_modes[i].fp,0);
screen.size(_width,_height);
#endif
return true;
}
}
return false;
}
void cga::setmode(Mode mode)
{
#ifdef __BORLANDC__
_AL=(unsigned char) mode;
_AH=0;
geninterrupt(0x10);
#endif
}
bool cga::graphmode(Mode mode)
{
switch (mode) {
case TEXT:
return textmode();
case X16:
setpalette(palette::TEXT_PAL);
return x16mode();
case CGALO1:
setpalette(palette::CGA1HI_PAL);
break;
case CGALO2:
setpalette(palette::CGA2HI_PAL);
break;
case CGAHI:
setpalette(palette::BW_PAL);
break;
case UNDEF:
case COMPAQ:
case HERC:
case BWTEXT:
case PCJRLO:
case PCJRMED:
case PCJRHI:
case EGALO:
case EGAMED:
case EGAMONO:
case EGAHI:
case VGAMONO:
case VGAHI:
case VGALO:
case SVGA:
case XGA:
case HD:
case FHD:
return false;
}
_vmode=mode;
setmode(_vmode);
return setup();
}
bool cga::textmode(void)
{
#ifdef __BORLANDC__
setmode(TEXT);
return setup();
#else
return true;
#endif
}
bool cga::x16mode(void)
{
#ifdef __BORLANDC__
unsigned char status;
setmode(TEXT);
/* set mode control register for 80x25 text mode and disable video output */
outportb(CRTCa, 1);
/*
These settings put the 6845 into "graphics" mode without actually
switching the CGA controller into graphics mode. The register
values are directly copied from CGA graphics mode register
settings. The 6845 does not directly display graphics, the
6845 only generates addresses and sync signals, the CGA
attribute controller either displays character ROM data or color
pixel data, this is external to the 6845 and keeps the CGA card
in text mode.
ref: HELPPC
*/
/* set vert total lines to 127 */
write_crtc(CRTCb,0x04,0x7f);
/* set vert displayed char rows to 100 */
write_crtc(CRTCb,0x06,0x64);
/* set vert sync position to 112 */
write_crtc(CRTCb,0x07,0x70);
/* set char scan line count to 1 */
write_crtc(CRTCb,0x09,0x01);
/* re-enable the video output in 80x25 text mode */
outportb(CRTCa, 9);
_vmode=X16;
return setup();
#else
return true;
#endif
}
void cga::write_crtc(unsigned int port, unsigned char reg, unsigned char val)
{
#ifdef __BORLANDC__
outportb(port, reg);
outportb(port+1,val);
#endif
}
adapter::Mode cga::getmode(void)
{
#ifdef __BORLANDC__
_AX=0x0f00;
geninterrupt(0x10);
_vmode=(Mode)_AL;
return (_vmode);
#else
return _vmode;
#endif
}
void cga::cls(void)
{
screen.clear();
update();
}
void cga::update(void)
{
vsync();
translate(screen._buffer);
}
void cga::translate(ptr_t src)
{
#ifdef __BORLANDC__
switch (_vmode) {
case TEXT:
_CX=buf_size>>1;
_DI=FP_OFF(_buffer);
_SI=FP_OFF(src);
_BX=FP_SEG(src);
_DS=_BX;
_AX=FP_SEG(_buffer);
_ES=_AX;
xlatetext:
asm {
lodsw // 5
mov bx, ax
shl ax,8
mov al,0xDB
stosw
mov ax, bx
mov al,0xDB
stosw
loop xlatetext // 15
} // 44
break;
case X16:
#ifdef i86
_CX=buf_size>>1;
_DI=FP_OFF(_buffer);
_SI=FP_OFF(src);
_BX=FP_SEG(src);
_DS=_BX;
_AX=FP_SEG(_buffer);
_ES=_AX;
xlate16:
asm {
lodsw // 5
shl al, 4 // 3
or ah, al // 2
mov al, 0xde // 2
stosw // 4
loop xlate16 // 15
} // 44
#else
_CX=buf_size>>2;
_DI=FP_OFF(_buffer);
_SI=FP_OFF(src);
_BX=FP_SEG(src);
_DS=_BX;
_AX=FP_SEG(_buffer);
_ES=_AX;
xlate32:
asm {
lodsd // 5
//and eax, 0x0F0F0F0F // 2
shl al, 4 // 3
or ah, al // 2
mov al, 0xde // 2
ror eax, 16 // 3
shl al, 4 // 3
or ah, al // 2
mov al, 0xde // 2
rol eax, 16 // 3
stosd // 4
loop xlate32 // 15
} // 44
#endif
break;
case CGALO1:
case CGALO2:
_DX=_height>>1;
_SI=FP_OFF(src);
_DI=FP_OFF(_buffer);
_CX=FP_SEG(src);
_AX=FP_SEG(_buffer);
_DS=_CX;
_ES=_AX;
#ifdef i86
xlatelo:
asm {
mov cx, 80
}
xevenlo:
asm {
lodsw // 5
// HHHH HHHH LLLL LLLL
shl al, 2 // 3 0000 00xx 0000 xx00
or al, ah // 2 0000 00xx 0000 xxxx
shl al, 4 // 2 0000 00xx xxxx 0000
mov bx, ax
lodsw
shl al, 2 // 3 0000 00xx 0000 xx00
or al, ah // 2 0000 00xx 0000 xxxx
or al, bl // 2 0000 0000 xxxx xxxx
stosb // 4
loop xevenlo //
push di
add di, 0x1FB0
mov cx, 80
} // 44
xoddlo:
asm {
lodsw // 5
// HHHH HHHH LLLL LLLL
shl al, 2 // 3 0000 00xx 0000 xx00
or al, ah // 2 0000 00xx 0000 xxxx
shl al, 4 // 2 0000 00xx xxxx 0000
mov bx, ax
lodsw
shl al, 2 // 3 0000 00xx 0000 xx00
or al, ah // 2 0000 00xx 0000 xxxx
or al, bl // 2 0000 0000 xxxx xxxx
stosb // 4
loop xoddlo //
pop di
dec dx
jnz xlatelo
} // 44
#else
xlatelo:
asm {
mov cx,80
}
xevenlo:
asm {
lodsd // 5
// HHHH HHHH LLLL LLLL
shl al, 2 // 3 0000 00xx 0000 00xx 0000 00xx 0000 xx00
or al, ah // 2 0000 00xx 0000 00xx 0000 00xx 0000 xxxx
ror eax, 16 // 3 0000 00xx 0000 xxxx 0000 00xx 0000 00xx
shl al, 2 // 3 0000 00xx 0000 xxxx 0000 00xx 0000 xx00
or al, ah // 2 0000 00xx 0000 xxxx 0000 00xx 0000 xxxx
shl ax, 12 // 0000 00xx 0000 xxxx xxxx 0000 0000 0000
shr eax,12 // 0000 0000 0000 0000 00xx 0000 xxxx xxxx
stosb // 4
loop xevenlo //
push di
add di, 0x1FB0
mov cx,80
} // 44
xoddlo:
asm {
lodsd // 5
// HHHH HHHH LLLL LLLL
shl al, 2 // 3 0000 00xx 0000 00xx 0000 00xx 0000 xx00
or al, ah // 2 0000 00xx 0000 00xx 0000 00xx 0000 xxxx
ror eax, 16 // 3 0000 00xx 0000 xxxx 0000 00xx 0000 00xx
shl al, 2 // 3 0000 00xx 0000 xxxx 0000 00xx 0000 xx00
or al, ah // 2 0000 00xx 0000 xxxx 0000 00xx 0000 xxxx
shl ax, 12 // 0000 00xx 0000 xxxx xxxx 0000 0000 0000
shr eax,12 // 0000 0000 0000 0000 00xx 0000 xxxx xxxx
stosb // 4
loop xoddlo //
pop di
dec dx
jnz xlatelo
} // 44
#endif
break;
case CGAHI:
_DX=_height>>2;
_SI=FP_OFF(src);
_DI=FP_OFF(_buffer);
_CX=FP_SEG(src);
_AX=FP_SEG(_buffer);
// _BX=_row_bytes;
_DS=_CX;
_ES=_AX;
#ifdef i86
xlatehi:
asm {
mov cx,80
}
xevenhi:
asm {
lodsw // 5
// HHHH HHHH LLLL LLLL
shr ax, 1
rcl bx, 1
shr ax, 8
rcl bx, 1
lodsw
shr ax, 1
rcl bx, 1
shr ax, 8
rcl bx, 1
lodsw
shr ax, 1
rcl bx, 1
shr ax, 8
rcl bx, 1
lodsw
shr ax, 1
rcl bx, 1
shr ax, 8
rcl bx, 1
// mov ax,bx
mov es:[di],bl
inc di
// stosb // 4
loop xevenhi //
push di
add di, 0x1FB0
mov cx,80
} // 44
xoddhi:
asm {
lodsw // 5
// HHHH HHHH LLLL LLLL
shr ax, 1
rcl bx, 1
shr ax, 8
rcl bx, 1
lodsw
shr ax, 1
rcl bx, 1
shr ax, 8
rcl bx, 1
lodsw
shr ax, 1
rcl bx, 1
shr ax, 8
rcl bx, 1
lodsw
shr ax, 1
rcl bx, 1
shr ax, 8
rcl bx, 1
// mov ax,bx
mov es:[di],bl
inc di
// HHHH HHHH LLLL LLLL
loop xoddhi //
pop di
dec dx
jnz xlatehi
} // 44
#else
xlatehi:
asm {
mov cx,80
}
xevenhi:
asm {
lodsd // 5
// HHHH HHHH LLLL LLLL
shr eax, 1
rcl bx, 1
shr eax, 8
rcl bx, 1
shr eax, 8
rcl bx, 1
shr eax, 8
rcl bx, 1
lodsd
shr eax, 1
rcl bx, 1
shr eax, 8
rcl bx, 1
shr eax, 8
rcl bx, 1
shr eax, 8
rcl bx, 1
// mov ax,bx
mov es:[di],bl
inc di
// stosb // 4
loop xevenhi //
push di
add di, 0x1FB0
mov cx,80
} // 44
xoddhi:
asm {
lodsd // 5
// HHHH HHHH LLLL LLLL
shr eax, 1
rcl bx, 1
shr eax, 8
rcl bx, 1
shr eax, 8
rcl bx, 1
shr eax, 8
rcl bx, 1
lodsd
shr eax, 1
rcl bx, 1
shr eax, 8
rcl bx, 1
shr eax, 8
rcl bx, 1
shr eax, 8
rcl bx, 1
// mov ax,bx
mov es:[di],bl
inc di
// HHHH HHHH LLLL LLLL
loop xoddhi //
pop di
dec dx
jnz xlatehi
} // 44
#endif
break;
}
#endif
}
void cga::vsync(void)
{
#ifdef __BORLANDC__
unsigned char p;
do {
p=inportb(SR);
} while (p & 8);
do {
p=inportb(SR);
} while (!(p & 8));
#endif
}
bool cga::setpalette(palette::pal_type pal)
{
_cur_palette = pal;
switch (pal) {
case palette::CGA0_PAL:
pal_reg.data.pal = 0;
pal_reg.data.fg_int = 0;
if (_vmode != adapter::CGALO2) setmode(adapter::CGALO1);
break;
case palette::CGA1_PAL:
pal_reg.data.pal = 1;
pal_reg.data.fg_int = 0;
if (_vmode != adapter::CGALO2) setmode(adapter::CGALO1);
break;
case palette::CGA0HI_PAL:
pal_reg.data.pal = 0;
pal_reg.data.fg_int = 1;
if (_vmode != adapter::CGALO2) setmode(adapter::CGALO1);
break;
case palette::CGA1HI_PAL:
pal_reg.data.pal = 1;
pal_reg.data.fg_int = 1;
if (_vmode != adapter::CGALO2) setmode(adapter::CGALO1);
break;
case palette::CGA2_PAL:
pal_reg.data.pal = 0;
pal_reg.data.fg_int = 0;
if (_vmode != adapter::CGALO2) setmode(adapter::CGALO2);
break;
case palette::CGA2HI_PAL:
pal_reg.data.pal = 0;
pal_reg.data.fg_int = 1;
if (_vmode != adapter::CGALO2) setmode(adapter::CGALO2);
break;
case palette::BW_PAL:
pal_reg.data.pal = 0;
pal_reg.data.fg_int = 0;
break;
case palette::TEXT_PAL:
case palette::VGA_PAL:
case palette::RGB_PAL:
case palette::WEB_PAL:
case palette::X11_PAL:
case palette::CUSTOM:
case palette::NONE:
return false;
}
#ifdef __BORLANDC__
outportb(CGA_PAL_REG,pal_reg.reg);
#endif
return true;
}
bool cga::setpalette(palette::pal_t *pal, int palette_entries)
{
// TODO
return false;
}