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86Box/src/machine/m_xt_t1000_vid.c

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/*
* VARCem Virtual ARchaeological Computer EMulator.
* An emulator of (mostly) x86-based PC systems and devices,
* using the ISA,EISA,VLB,MCA and PCI system buses, roughly
* spanning the era between 1981 and 1995.
*
* This file is part of the VARCem Project.
*
* Implementation of the Toshiba T1000 plasma display, which
* has a fixed resolution of 640x200 pixels.
*
*
*
* Authors: Fred N. van Kempen, <decwiz@yahoo.com>
* Miran Grca, <mgrca8@gmail.com>
* Sarah Walker, <tommowalker@tommowalker.co.uk>
*
* Copyright 2018,2019 Fred N. van Kempen.
* Copyright 2018,2019 Miran Grca.
* Copyright 2018,2019 Sarah Walker.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the:
*
* Free Software Foundation, Inc.
* 59 Temple Place - Suite 330
* Boston, MA 02111-1307
* USA.
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <86box/86box.h>
#include <86box/device.h>
#include <86box/io.h>
#include <86box/mem.h>
#include <86box/timer.h>
#include "cpu.h"
#include <86box/video.h>
#include <86box/vid_cga.h>
#include <86box/m_xt_t1000.h>
#define T1000_XSIZE 640
#define T1000_YSIZE 200
/* Mapping of attributes to colours */
static uint32_t blue, grey;
static uint8_t boldcols[256]; /* Which attributes use the bold font */
static uint32_t blinkcols[256][2];
static uint32_t normcols[256][2];
static uint8_t language;
static video_timings_t timing_t1000 = {VIDEO_ISA, 8,16,32, 8,16,32};
/* Video options set by the motherboard; they will be picked up by the card
* on the next poll.
*
* Bit 1: Danish
* Bit 0: Thin font
*/
static uint8_t st_video_options;
static uint8_t st_enabled = 1;
static int8_t st_display_internal = -1;
void t1000_video_options_set(uint8_t options)
{
st_video_options = options & 1;
st_video_options |= language;
}
void t1000_video_enable(uint8_t enabled)
{
st_enabled = enabled;
}
void t1000_display_set(uint8_t internal)
{
st_display_internal = (int8_t)internal;
}
uint8_t t1000_display_get()
{
return (uint8_t)st_display_internal;
}
typedef struct t1000_t
{
mem_mapping_t mapping;
cga_t cga; /* The CGA is used for the external
* display; most of its registers are
* ignored by the plasma display. */
int font; /* Current font, 0-3 */
int enabled; /* Hardware enabled, 0 or 1 */
int internal; /* Using internal display? */
uint8_t attrmap; /* Attribute mapping register */
uint64_t dispontime, dispofftime;
int linepos, displine;
int vc;
int dispon;
int vsynctime;
uint8_t video_options;
uint8_t backlight, invert;
uint8_t *vram;
} t1000_t;
static void t1000_recalctimings(t1000_t *t1000);
static void t1000_write(uint32_t addr, uint8_t val, void *p);
static uint8_t t1000_read(uint32_t addr, void *p);
static void t1000_recalcattrs(t1000_t *t1000);
static void t1000_out(uint16_t addr, uint8_t val, void *p)
{
t1000_t *t1000 = (t1000_t *)p;
switch (addr)
{
/* Emulated CRTC, register select */
case 0x3d0: case 0x3d2: case 0x3d4: case 0x3d6:
cga_out(addr, val, &t1000->cga);
break;
/* Emulated CRTC, value */
case 0x3d1: case 0x3d3: case 0x3d5: case 0x3d7:
/* Register 0x12 controls the attribute mappings for the
* LCD screen. */
if (t1000->cga.crtcreg == 0x12)
{
t1000->attrmap = val;
t1000_recalcattrs(t1000);
return;
}
cga_out(addr, val, &t1000->cga);
t1000_recalctimings(t1000);
return;
/* CGA control register */
case 0x3D8:
cga_out(addr, val, &t1000->cga);
return;
/* CGA colour register */
case 0x3D9:
cga_out(addr, val, &t1000->cga);
return;
}
}
static uint8_t t1000_in(uint16_t addr, void *p)
{
t1000_t *t1000 = (t1000_t *)p;
uint8_t val;
switch (addr)
{
case 0x3d1: case 0x3d3: case 0x3d5: case 0x3d7:
if (t1000->cga.crtcreg == 0x12)
{
val = t1000->attrmap & 0x0F;
if (t1000->internal) val |= 0x20; /* LCD / CRT */
return val;
}
}
return cga_in(addr, &t1000->cga);
}
static void t1000_write(uint32_t addr, uint8_t val, void *p)
{
t1000_t *t1000 = (t1000_t *)p;
t1000->vram[addr & 0x3fff] = val;
cycles -= 4;
}
static uint8_t t1000_read(uint32_t addr, void *p)
{
t1000_t *t1000 = (t1000_t *)p;
cycles -= 4;
return t1000->vram[addr & 0x3fff];
}
static void t1000_recalctimings(t1000_t *t1000)
{
double disptime;
double _dispontime, _dispofftime;
if (!t1000->internal)
{
cga_recalctimings(&t1000->cga);
return;
}
disptime = 651;
_dispontime = 640;
_dispofftime = disptime - _dispontime;
t1000->dispontime = (uint64_t)(_dispontime * xt_cpu_multi);
t1000->dispofftime = (uint64_t)(_dispofftime * xt_cpu_multi);
}
/* Draw a row of text in 80-column mode */
static void t1000_text_row80(t1000_t *t1000)
{
uint32_t cols[2];
int x, c;
uint8_t chr, attr;
int drawcursor;
int cursorline;
int bold;
int blink;
uint16_t addr;
uint8_t sc;
uint16_t ma = (t1000->cga.crtc[13] | (t1000->cga.crtc[12] << 8)) & 0x3fff;
uint16_t ca = (t1000->cga.crtc[15] | (t1000->cga.crtc[14] << 8)) & 0x3fff;
sc = (t1000->displine) & 7;
addr = ((ma & ~1) + (t1000->displine >> 3) * 80) * 2;
ma += (t1000->displine >> 3) * 80;
if ((t1000->cga.crtc[10] & 0x60) == 0x20)
{
cursorline = 0;
}
else
{
cursorline = ((t1000->cga.crtc[10] & 0x0F) <= sc) &&
((t1000->cga.crtc[11] & 0x0F) >= sc);
}
for (x = 0; x < 80; x++)
{
chr = t1000->vram[(addr + 2 * x) & 0x3FFF];
attr = t1000->vram[(addr + 2 * x + 1) & 0x3FFF];
drawcursor = ((ma == ca) && cursorline &&
(t1000->cga.cgamode & 8) && (t1000->cga.cgablink & 16));
blink = ((t1000->cga.cgablink & 16) && (t1000->cga.cgamode & 0x20) &&
(attr & 0x80) && !drawcursor);
if (t1000->video_options & 1)
bold = boldcols[attr] ? chr : chr + 256;
else
bold = boldcols[attr] ? chr + 256 : chr;
if (t1000->video_options & 2)
bold += 512;
if (t1000->cga.cgamode & 0x20) /* Blink */
{
cols[1] = blinkcols[attr][1];
cols[0] = blinkcols[attr][0];
if (blink) cols[1] = cols[0];
}
else
{
cols[1] = normcols[attr][1];
cols[0] = normcols[attr][0];
}
if (drawcursor)
{
for (c = 0; c < 8; c++)
{
((uint32_t *)buffer32->line[t1000->displine])[(x << 3) + c] = cols[(fontdat[bold][sc] & (1 << (c ^ 7))) ? 1 : 0] ^ (blue ^ grey);
}
}
else
{
for (c = 0; c < 8; c++)
((uint32_t *)buffer32->line[t1000->displine])[(x << 3) + c] = cols[(fontdat[bold][sc] & (1 << (c ^ 7))) ? 1 : 0];
}
++ma;
}
}
/* Draw a row of text in 40-column mode */
static void t1000_text_row40(t1000_t *t1000)
{
uint32_t cols[2];
int x, c;
uint8_t chr, attr;
int drawcursor;
int cursorline;
int bold;
int blink;
uint16_t addr;
uint8_t sc;
uint16_t ma = (t1000->cga.crtc[13] | (t1000->cga.crtc[12] << 8)) & 0x3fff;
uint16_t ca = (t1000->cga.crtc[15] | (t1000->cga.crtc[14] << 8)) & 0x3fff;
sc = (t1000->displine) & 7;
addr = ((ma & ~1) + (t1000->displine >> 3) * 40) * 2;
ma += (t1000->displine >> 3) * 40;
if ((t1000->cga.crtc[10] & 0x60) == 0x20)
{
cursorline = 0;
}
else
{
cursorline = ((t1000->cga.crtc[10] & 0x0F) <= sc) &&
((t1000->cga.crtc[11] & 0x0F) >= sc);
}
for (x = 0; x < 40; x++)
{
chr = t1000->vram[(addr + 2 * x) & 0x3FFF];
attr = t1000->vram[(addr + 2 * x + 1) & 0x3FFF];
drawcursor = ((ma == ca) && cursorline &&
(t1000->cga.cgamode & 8) && (t1000->cga.cgablink & 16));
blink = ((t1000->cga.cgablink & 16) && (t1000->cga.cgamode & 0x20) &&
(attr & 0x80) && !drawcursor);
if (t1000->video_options & 1)
bold = boldcols[attr] ? chr : chr + 256;
else
bold = boldcols[attr] ? chr + 256 : chr;
if (t1000->video_options & 2)
bold += 512;
if (t1000->cga.cgamode & 0x20) /* Blink */
{
cols[1] = blinkcols[attr][1];
cols[0] = blinkcols[attr][0];
if (blink) cols[1] = cols[0];
}
else
{
cols[1] = normcols[attr][1];
cols[0] = normcols[attr][0];
}
if (drawcursor)
{
for (c = 0; c < 8; c++)
{
((uint32_t *)buffer32->line[t1000->displine])[(x << 4) + c*2] =
((uint32_t *)buffer32->line[t1000->displine])[(x << 4) + c*2 + 1] = cols[(fontdat[bold][sc] & (1 << (c ^ 7))) ? 1 : 0] ^ (blue ^ grey);
}
}
else
{
for (c = 0; c < 8; c++)
{
((uint32_t *)buffer32->line[t1000->displine])[(x << 4) + c*2] =
((uint32_t *)buffer32->line[t1000->displine])[(x << 4) + c*2+1] = cols[(fontdat[bold][sc] & (1 << (c ^ 7))) ? 1 : 0];
}
}
++ma;
}
}
/* Draw a line in CGA 640x200 mode */
static void t1000_cgaline6(t1000_t *t1000)
{
int x, c;
uint8_t dat;
uint32_t ink = 0;
uint16_t addr;
uint32_t fg = (t1000->cga.cgacol & 0x0F) ? blue : grey;
uint32_t bg = grey;
uint16_t ma = (t1000->cga.crtc[13] | (t1000->cga.crtc[12] << 8)) & 0x3fff;
addr = ((t1000->displine) & 1) * 0x2000 +
(t1000->displine >> 1) * 80 +
((ma & ~1) << 1);
for (x = 0; x < 80; x++)
{
dat = t1000->vram[addr & 0x3FFF];
addr++;
for (c = 0; c < 8; c++)
{
ink = (dat & 0x80) ? fg : bg;
if (!(t1000->cga.cgamode & 8))
ink = grey;
((uint32_t *)buffer32->line[t1000->displine])[x*8+c] = ink;
dat = dat << 1;
}
}
}
/* Draw a line in CGA 320x200 mode. Here the CGA colours are converted to
* dither patterns: colour 1 to 25% grey, colour 2 to 50% grey */
static void t1000_cgaline4(t1000_t *t1000)
{
int x, c;
uint8_t dat, pattern;
uint32_t ink0, ink1;
uint16_t addr;
uint16_t ma = (t1000->cga.crtc[13] | (t1000->cga.crtc[12] << 8)) & 0x3fff;
addr = ((t1000->displine) & 1) * 0x2000 +
(t1000->displine >> 1) * 80 +
((ma & ~1) << 1);
for (x = 0; x < 80; x++)
{
dat = t1000->vram[addr & 0x3FFF];
addr++;
for (c = 0; c < 4; c++)
{
pattern = (dat & 0xC0) >> 6;
if (!(t1000->cga.cgamode & 8)) pattern = 0;
switch (pattern & 3)
{
default:
case 0: ink0 = ink1 = grey; break;
case 1: if (t1000->displine & 1)
{
ink0 = grey; ink1 = grey;
}
else
{
ink0 = blue; ink1 = grey;
}
break;
case 2: if (t1000->displine & 1)
{
ink0 = grey; ink1 = blue;
}
else
{
ink0 = blue; ink1 = grey;
}
break;
case 3: ink0 = ink1 = blue; break;
}
((uint32_t *)buffer32->line[t1000->displine])[x*8+2*c] = ink0;
((uint32_t *)buffer32->line[t1000->displine])[x*8+2*c+1] = ink1;
dat = dat << 2;
}
}
}
static void t1000_poll(void *p)
{
t1000_t *t1000 = (t1000_t *)p;
if (t1000->video_options != st_video_options ||
t1000->enabled != st_enabled)
{
t1000->video_options = st_video_options;
t1000->enabled = st_enabled;
/* Set the font used for the external display */
t1000->cga.fontbase = ((t1000->video_options & 3) * 256);
if (t1000->enabled) /* Disable internal chipset */
mem_mapping_enable(&t1000->mapping);
else
mem_mapping_disable(&t1000->mapping);
}
/* Switch between internal plasma and external CRT display. */
if (st_display_internal != -1 && st_display_internal != t1000->internal)
{
t1000->internal = st_display_internal;
t1000_recalctimings(t1000);
}
if (!t1000->internal)
{
cga_poll(&t1000->cga);
return;
}
if (!t1000->linepos)
{
timer_advance_u64(&t1000->cga.timer, t1000->dispofftime);
t1000->cga.cgastat |= 1;
t1000->linepos = 1;
if (t1000->dispon)
{
if (t1000->displine == 0)
{
video_wait_for_buffer();
}
/* Graphics */
if (t1000->cga.cgamode & 0x02)
{
if (t1000->cga.cgamode & 0x10)
t1000_cgaline6(t1000);
else t1000_cgaline4(t1000);
}
else
if (t1000->cga.cgamode & 0x01) /* High-res text */
{
t1000_text_row80(t1000);
}
else
{
t1000_text_row40(t1000);
}
}
t1000->displine++;
/* Hardcode a fixed refresh rate and VSYNC timing */
if (t1000->displine == 200) /* Start of VSYNC */
{
t1000->cga.cgastat |= 8;
t1000->dispon = 0;
}
if (t1000->displine == 216) /* End of VSYNC */
{
t1000->displine = 0;
t1000->cga.cgastat &= ~8;
t1000->dispon = 1;
}
}
else
{
if (t1000->dispon)
{
t1000->cga.cgastat &= ~1;
}
timer_advance_u64(&t1000->cga.timer, t1000->dispontime);
t1000->linepos = 0;
if (t1000->displine == 200)
{
/* Hardcode 640x200 window size */
if ((T1000_XSIZE != xsize) || (T1000_YSIZE != ysize) || video_force_resize_get())
{
xsize = T1000_XSIZE;
ysize = T1000_YSIZE;
if (xsize < 64) xsize = 656;
if (ysize < 32) ysize = 200;
set_screen_size(xsize, ysize);
if (video_force_resize_get())
video_force_resize_set(0);
}
video_blit_memtoscreen(0, 0, 0, ysize, xsize, ysize);
frames++;
/* Fixed 640x200 resolution */
video_res_x = T1000_XSIZE;
video_res_y = T1000_YSIZE;
if (t1000->cga.cgamode & 0x02)
{
if (t1000->cga.cgamode & 0x10)
video_bpp = 1;
else video_bpp = 2;
}
else video_bpp = 0;
t1000->cga.cgablink++;
}
}
}
static void t1000_recalcattrs(t1000_t *t1000)
{
int n;
/* val behaves as follows:
* Bit 0: Attributes 01-06, 08-0E are inverse video
* Bit 1: Attributes 01-06, 08-0E are bold
* Bit 2: Attributes 11-16, 18-1F, 21-26, 28-2F ... F1-F6, F8-FF
* are inverse video
* Bit 3: Attributes 11-16, 18-1F, 21-26, 28-2F ... F1-F6, F8-FF
* are bold */
/* Set up colours */
if (t1000->invert) {
if (t1000->backlight) {
grey = makecol(0x2D, 0x39, 0x5A);
blue = makecol(0x85, 0xa0, 0xD6);
} else {
grey = makecol(0x0f, 0x21, 0x3f);
blue = makecol(0x1C, 0x71, 0x31);
}
} else {
if (t1000->backlight) {
blue = makecol(0x2D, 0x39, 0x5A);
grey = makecol(0x85, 0xa0, 0xD6);
} else {
blue = makecol(0x0f, 0x21, 0x3f);
grey = makecol(0x1C, 0x71, 0x31);
}
}
/* Initialise the attribute mapping. Start by defaulting everything
* to grey on blue, and with bold set by bit 3 */
for (n = 0; n < 256; n++)
{
boldcols[n] = (n & 8) != 0;
blinkcols[n][0] = normcols[n][0] = blue;
blinkcols[n][1] = normcols[n][1] = grey;
}
/* Colours 0x11-0xFF are controlled by bits 2 and 3 of the
* passed value. Exclude x0 and x8, which are always grey on
* blue. */
for (n = 0x11; n <= 0xFF; n++)
{
if ((n & 7) == 0) continue;
if (t1000->attrmap & 4) /* Inverse */
{
blinkcols[n][0] = normcols[n][0] = blue;
blinkcols[n][1] = normcols[n][1] = grey;
}
else /* Normal */
{
blinkcols[n][0] = normcols[n][0] = grey;
blinkcols[n][1] = normcols[n][1] = blue;
}
if (t1000->attrmap & 8) boldcols[n] = 1; /* Bold */
}
/* Set up the 01-0E range, controlled by bits 0 and 1 of the
* passed value. When blinking is enabled this also affects 81-8E. */
for (n = 0x01; n <= 0x0E; n++)
{
if (n == 7) continue;
if (t1000->attrmap & 1)
{
blinkcols[n][0] = normcols[n][0] = blue;
blinkcols[n][1] = normcols[n][1] = grey;
blinkcols[n+128][0] = blue;
blinkcols[n+128][1] = grey;
}
else
{
blinkcols[n][0] = normcols[n][0] = grey;
blinkcols[n][1] = normcols[n][1] = blue;
blinkcols[n+128][0] = grey;
blinkcols[n+128][1] = blue;
}
if (t1000->attrmap & 2) boldcols[n] = 1;
}
/* Colours 07 and 0F are always blue on grey. If blinking is
* enabled so are 87 and 8F. */
for (n = 0x07; n <= 0x0F; n += 8)
{
blinkcols[n][0] = normcols[n][0] = grey;
blinkcols[n][1] = normcols[n][1] = blue;
blinkcols[n+128][0] = grey;
blinkcols[n+128][1] = blue;
}
/* When not blinking, colours 81-8F are always blue on grey. */
for (n = 0x81; n <= 0x8F; n ++)
{
normcols[n][0] = grey;
normcols[n][1] = blue;
boldcols[n] = (n & 0x08) != 0;
}
/* Finally do the ones which are solid grey. These differ between
* the normal and blinking mappings */
for (n = 0; n <= 0xFF; n += 0x11)
{
normcols[n][0] = normcols[n][1] = grey;
}
/* In the blinking range, 00 11 22 .. 77 and 80 91 A2 .. F7 are grey */
for (n = 0; n <= 0x77; n += 0x11)
{
blinkcols[n][0] = blinkcols[n][1] = grey;
blinkcols[n+128][0] = blinkcols[n+128][1] = grey;
}
}
static void *t1000_init(const device_t *info)
{
t1000_t *t1000 = malloc(sizeof(t1000_t));
memset(t1000, 0, sizeof(t1000_t));
loadfont("roms/machines/t1000/t1000font.bin", 8);
cga_init(&t1000->cga);
video_inform(VIDEO_FLAG_TYPE_CGA, &timing_t1000);
t1000->internal = 1;
t1000->backlight = device_get_config_int("backlight");
t1000->invert = device_get_config_int("invert");
/* 16k video RAM */
t1000->vram = malloc(0x4000);
timer_set_callback(&t1000->cga.timer, t1000_poll);
timer_set_p(&t1000->cga.timer, t1000);
/* Occupy memory between 0xB8000 and 0xBFFFF */
mem_mapping_add(&t1000->mapping, 0xb8000, 0x8000, t1000_read, NULL, NULL, t1000_write, NULL, NULL, NULL, 0, t1000);
/* Respond to CGA I/O ports */
io_sethandler(0x03d0, 0x000c, t1000_in, NULL, NULL, t1000_out, NULL, NULL, t1000);
/* Default attribute mapping is 4 */
t1000->attrmap = 4;
t1000_recalcattrs(t1000);
/* Start off in 80x25 text mode */
t1000->cga.cgastat = 0xF4;
t1000->cga.vram = t1000->vram;
t1000->enabled = 1;
t1000->video_options = 0x01;
language = device_get_config_int("display_language") ? 2 : 0;
return t1000;
}
static void t1000_close(void *p)
{
t1000_t *t1000 = (t1000_t *)p;
free(t1000->vram);
free(t1000);
}
static void t1000_speed_changed(void *p)
{
t1000_t *t1000 = (t1000_t *)p;
t1000_recalctimings(t1000);
}
static const device_config_t t1000_config[] =
{
{
.name = "display_language",
.description = "Language",
.type = CONFIG_SELECTION,
.selection =
{
{
.description = "USA",
.value = 0
},
{
.description = "Danish",
.value = 1
}
},
.default_int = 0
},
{
"backlight", "Enable backlight", CONFIG_BINARY, "", 1
},
{
"invert", "Invert colors", CONFIG_BINARY, "", 0
},
{
.type = -1
}
};
const device_t t1000_video_device = {
"Toshiba T1000 Video",
0, 0,
t1000_init, t1000_close, NULL,
{ NULL },
t1000_speed_changed,
NULL,
t1000_config
};
const device_t t1200_video_device = {
"Toshiba T1200 Video",
0, 0,
t1000_init, t1000_close, NULL,
{ NULL },
t1000_speed_changed,
NULL,
t1000_config
};
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