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86Box/src/machine/m_at_t3100e_vid.c
Jasmine Iwanek 698b16a603 src/machine
2022-03-13 09:46:07 -04:00

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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 3100e plasma display.
* This display has a fixed 640x400 resolution.
*
* T3100e CRTC regs (from the ROM):
*
* Selecting a character height of 3 seems to be sufficient to
* convert the 640x200 graphics mode to 640x400 (and, by
* analogy, 320x200 to 320x400).
*
* Horiz-----> Vert------> I ch
* 38 28 2D 0A 1F 06 19 1C 02 07 06 07 CO40
* 71 50 5A 0A 1F 06 19 1C 02 07 06 07 CO80
* 38 28 2D 0A 7F 06 64 70 02 01 06 07 Graphics
* 61 50 52 0F 19 06 19 19 02 0D 0B 0C MONO
* 2D 28 22 0A 67 00 64 67 02 03 06 07 640x400
*
*
*
* Authors: Fred N. van Kempen, <decwiz@yahoo.com>
* Miran Grca, <mgrca8@gmail.com>
* Sarah Walker, <tommowalker@tommowalker.co.uk>
*
* Copyright 2017-2019 Fred N. van Kempen.
* Copyright 2016-2019 Miran Grca.
* Copyright 2008-2019 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 <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#define HAVE_STDARG_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_at_t3100e.h>
#define T3100E_XSIZE 640
#define T3100E_YSIZE 400
/*Very rough estimate*/
#define VID_CLOCK (double)(651 * 416 * 60)
/* Mapping of attributes to colours */
static uint32_t amber, black;
static uint8_t boldcols[256]; /* Which attributes use the bold font */
static uint32_t blinkcols[256][2];
static uint32_t normcols[256][2];
/* Video options set by the motherboard; they will be picked up by the card
* on the next poll.
*
* Bit 3: Disable built-in video (for add-on card)
* Bit 2: Thin font
* Bits 0,1: Font set (not currently implemented)
*/
static uint8_t st_video_options;
static int8_t st_display_internal = -1;
void t3100e_video_options_set(uint8_t options)
{
st_video_options = options;
}
void t3100e_display_set(uint8_t internal)
{
st_display_internal = internal;
}
uint8_t t3100e_display_get()
{
return st_display_internal;
}
typedef struct t3100e_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 *vram;
} t3100e_t;
static video_timings_t timing_t3100e = {VIDEO_ISA, 8,16,32, 8,16,32};
void t3100e_recalctimings(t3100e_t *t3100e);
void t3100e_write(uint32_t addr, uint8_t val, void *p);
uint8_t t3100e_read(uint32_t addr, void *p);
void t3100e_recalcattrs(t3100e_t *t3100e);
void t3100e_out(uint16_t addr, uint8_t val, void *p)
{
t3100e_t *t3100e = (t3100e_t *)p;
switch (addr)
{
/* Emulated CRTC, register select */
case 0x3d0: case 0x3d2: case 0x3d4: case 0x3d6:
cga_out(addr, val, &t3100e->cga);
break;
/* Emulated CRTC, value */
case 0x3d1: case 0x3d3: case 0x3d5: case 0x3d7:
/* Register 0x12 controls the attribute mappings for the
* plasma screen. */
if (t3100e->cga.crtcreg == 0x12)
{
t3100e->attrmap = val;
t3100e_recalcattrs(t3100e);
return;
}
cga_out(addr, val, &t3100e->cga);
t3100e_recalctimings(t3100e);
return;
/* CGA control register */
case 0x3D8:
cga_out(addr, val, &t3100e->cga);
return;
/* CGA colour register */
case 0x3D9:
cga_out(addr, val, &t3100e->cga);
return;
}
}
uint8_t t3100e_in(uint16_t addr, void *p)
{
t3100e_t *t3100e = (t3100e_t *)p;
uint8_t val;
switch (addr)
{
case 0x3d1: case 0x3d3: case 0x3d5: case 0x3d7:
if (t3100e->cga.crtcreg == 0x12)
{
val = t3100e->attrmap & 0x0F;
if (t3100e->internal) val |= 0x30; /* Plasma / CRT */
return val;
}
}
return cga_in(addr, &t3100e->cga);
}
void t3100e_write(uint32_t addr, uint8_t val, void *p)
{
t3100e_t *t3100e = (t3100e_t *)p;
t3100e->vram[addr & 0x7fff] = val;
cycles -= 4;
}
uint8_t t3100e_read(uint32_t addr, void *p)
{
t3100e_t *t3100e = (t3100e_t *)p;
cycles -= 4;
return t3100e->vram[addr & 0x7fff];
}
void t3100e_recalctimings(t3100e_t *t3100e)
{
double disptime;
double _dispontime, _dispofftime;
if (!t3100e->internal)
{
cga_recalctimings(&t3100e->cga);
return;
}
disptime = 651;
_dispontime = 640;
_dispofftime = disptime - _dispontime;
t3100e->dispontime = (uint64_t)(_dispontime * (cpuclock / VID_CLOCK) * (double)(1ull << 32));
t3100e->dispofftime = (uint64_t)(_dispofftime * (cpuclock / VID_CLOCK) * (double)(1ull << 32));
}
/* Draw a row of text in 80-column mode */
void t3100e_text_row80(t3100e_t *t3100e)
{
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 = (t3100e->cga.crtc[13] | (t3100e->cga.crtc[12] << 8)) & 0x7fff;
uint16_t ca = (t3100e->cga.crtc[15] | (t3100e->cga.crtc[14] << 8)) & 0x7fff;
sc = (t3100e->displine) & 15;
addr = ((ma & ~1) + (t3100e->displine >> 4) * 80) * 2;
ma += (t3100e->displine >> 4) * 80;
if ((t3100e->cga.crtc[10] & 0x60) == 0x20)
{
cursorline = 0;
}
else
{
cursorline = ((t3100e->cga.crtc[10] & 0x0F)*2 <= sc) &&
((t3100e->cga.crtc[11] & 0x0F)*2 >= sc);
}
for (x = 0; x < 80; x++)
{
chr = t3100e->vram[(addr + 2 * x) & 0x7FFF];
attr = t3100e->vram[(addr + 2 * x + 1) & 0x7FFF];
drawcursor = ((ma == ca) && cursorline &&
(t3100e->cga.cgamode & 8) && (t3100e->cga.cgablink & 16));
blink = ((t3100e->cga.cgablink & 16) && (t3100e->cga.cgamode & 0x20) &&
(attr & 0x80) && !drawcursor);
if (t3100e->video_options & 4)
bold = boldcols[attr] ? chr + 256 : chr;
else
bold = boldcols[attr] ? chr : chr + 256;
bold += 512 * (t3100e->video_options & 3);
if (t3100e->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[t3100e->displine])[(x << 3) + c] = cols[(fontdatm[bold][sc] & (1 << (c ^ 7))) ? 1 : 0] ^ (amber ^ black);
}
}
else
{
for (c = 0; c < 8; c++)
((uint32_t *)buffer32->line[t3100e->displine])[(x << 3) + c] = cols[(fontdatm[bold][sc] & (1 << (c ^ 7))) ? 1 : 0];
}
++ma;
}
}
/* Draw a row of text in 40-column mode */
void t3100e_text_row40(t3100e_t *t3100e)
{
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 = (t3100e->cga.crtc[13] | (t3100e->cga.crtc[12] << 8)) & 0x7fff;
uint16_t ca = (t3100e->cga.crtc[15] | (t3100e->cga.crtc[14] << 8)) & 0x7fff;
sc = (t3100e->displine) & 15;
addr = ((ma & ~1) + (t3100e->displine >> 4) * 40) * 2;
ma += (t3100e->displine >> 4) * 40;
if ((t3100e->cga.crtc[10] & 0x60) == 0x20)
{
cursorline = 0;
}
else
{
cursorline = ((t3100e->cga.crtc[10] & 0x0F)*2 <= sc) &&
((t3100e->cga.crtc[11] & 0x0F)*2 >= sc);
}
for (x = 0; x < 40; x++)
{
chr = t3100e->vram[(addr + 2 * x) & 0x7FFF];
attr = t3100e->vram[(addr + 2 * x + 1) & 0x7FFF];
drawcursor = ((ma == ca) && cursorline &&
(t3100e->cga.cgamode & 8) && (t3100e->cga.cgablink & 16));
blink = ((t3100e->cga.cgablink & 16) && (t3100e->cga.cgamode & 0x20) &&
(attr & 0x80) && !drawcursor);
if (t3100e->video_options & 4)
bold = boldcols[attr] ? chr + 256 : chr;
else bold = boldcols[attr] ? chr : chr + 256;
bold += 512 * (t3100e->video_options & 3);
if (t3100e->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[t3100e->displine])[(x << 4) + c*2] =
((uint32_t *)buffer32->line[t3100e->displine])[(x << 4) + c*2 + 1] = cols[(fontdatm[bold][sc] & (1 << (c ^ 7))) ? 1 : 0] ^ (amber ^ black);
}
}
else
{
for (c = 0; c < 8; c++)
{
((uint32_t *)buffer32->line[t3100e->displine])[(x << 4) + c*2] =
((uint32_t *)buffer32->line[t3100e->displine])[(x << 4) + c*2+1] = cols[(fontdatm[bold][sc] & (1 << (c ^ 7))) ? 1 : 0];
}
}
++ma;
}
}
/* Draw a line in CGA 640x200 or T3100e 640x400 mode */
void t3100e_cgaline6(t3100e_t *t3100e)
{
int x, c;
uint8_t dat;
uint32_t ink = 0;
uint16_t addr;
uint32_t fg = (t3100e->cga.cgacol & 0x0F) ? amber : black;
uint32_t bg = black;
uint16_t ma = (t3100e->cga.crtc[13] | (t3100e->cga.crtc[12] << 8)) & 0x7fff;
if (t3100e->cga.crtc[9] == 3) /* 640*400 */
{
addr = ((t3100e->displine) & 1) * 0x2000 +
((t3100e->displine >> 1) & 1) * 0x4000 +
(t3100e->displine >> 2) * 80 +
((ma & ~1) << 1);
}
else
{
addr = ((t3100e->displine >> 1) & 1) * 0x2000 +
(t3100e->displine >> 2) * 80 +
((ma & ~1) << 1);
}
for (x = 0; x < 80; x++)
{
dat = t3100e->vram[addr & 0x7FFF];
addr++;
for (c = 0; c < 8; c++)
{
ink = (dat & 0x80) ? fg : bg;
if (!(t3100e->cga.cgamode & 8)) ink = black;
((uint32_t *)buffer32->line[t3100e->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 */
void t3100e_cgaline4(t3100e_t *t3100e)
{
int x, c;
uint8_t dat, pattern;
uint32_t ink0 = 0, ink1 = 0;
uint16_t addr;
uint16_t ma = (t3100e->cga.crtc[13] | (t3100e->cga.crtc[12] << 8)) & 0x7fff;
if (t3100e->cga.crtc[9] == 3) /* 320*400 undocumented */
{
addr = ((t3100e->displine) & 1) * 0x2000 +
((t3100e->displine >> 1) & 1) * 0x4000 +
(t3100e->displine >> 2) * 80 +
((ma & ~1) << 1);
}
else /* 320*200 */
{
addr = ((t3100e->displine >> 1) & 1) * 0x2000 +
(t3100e->displine >> 2) * 80 +
((ma & ~1) << 1);
}
for (x = 0; x < 80; x++)
{
dat = t3100e->vram[addr & 0x7FFF];
addr++;
for (c = 0; c < 4; c++)
{
pattern = (dat & 0xC0) >> 6;
if (!(t3100e->cga.cgamode & 8)) pattern = 0;
switch (pattern & 3)
{
case 0: ink0 = ink1 = black; break;
case 1: if (t3100e->displine & 1)
{
ink0 = black; ink1 = black;
}
else
{
ink0 = amber; ink1 = black;
}
break;
case 2: if (t3100e->displine & 1)
{
ink0 = black; ink1 = amber;
}
else
{
ink0 = amber; ink1 = black;
}
break;
case 3: ink0 = ink1 = amber; break;
}
((uint32_t *)buffer32->line[t3100e->displine])[x*8+2*c] = ink0;
((uint32_t *)buffer32->line[t3100e->displine])[x*8+2*c+1] = ink1;
dat = dat << 2;
}
}
}
void t3100e_poll(void *p)
{
t3100e_t *t3100e = (t3100e_t *)p;
if (t3100e->video_options != st_video_options)
{
t3100e->video_options = st_video_options;
if (t3100e->video_options & 8) /* Disable internal CGA */
mem_mapping_disable(&t3100e->mapping);
else mem_mapping_enable(&t3100e->mapping);
/* Set the font used for the external display */
t3100e->cga.fontbase = (512 * (t3100e->video_options & 3))
+ ((t3100e->video_options & 4) ? 256 : 0);
}
/* Switch between internal plasma and external CRT display. */
if (st_display_internal != -1 && st_display_internal != t3100e->internal)
{
t3100e->internal = st_display_internal;
t3100e_recalctimings(t3100e);
}
if (!t3100e->internal)
{
cga_poll(&t3100e->cga);
return;
}
if (!t3100e->linepos)
{
timer_advance_u64(&t3100e->cga.timer, t3100e->dispofftime);
t3100e->cga.cgastat |= 1;
t3100e->linepos = 1;
if (t3100e->dispon)
{
if (t3100e->displine == 0)
{
video_wait_for_buffer();
}
/* Graphics */
if (t3100e->cga.cgamode & 0x02)
{
if (t3100e->cga.cgamode & 0x10)
t3100e_cgaline6(t3100e);
else t3100e_cgaline4(t3100e);
}
else
if (t3100e->cga.cgamode & 0x01) /* High-res text */
{
t3100e_text_row80(t3100e);
}
else
{
t3100e_text_row40(t3100e);
}
}
t3100e->displine++;
/* Hardcode a fixed refresh rate and VSYNC timing */
if (t3100e->displine == 400) /* Start of VSYNC */
{
t3100e->cga.cgastat |= 8;
t3100e->dispon = 0;
}
if (t3100e->displine == 416) /* End of VSYNC */
{
t3100e->displine = 0;
t3100e->cga.cgastat &= ~8;
t3100e->dispon = 1;
}
}
else
{
if (t3100e->dispon)
{
t3100e->cga.cgastat &= ~1;
}
timer_advance_u64(&t3100e->cga.timer, t3100e->dispontime);
t3100e->linepos = 0;
if (t3100e->displine == 400)
{
/* Hardcode 640x400 window size */
if ((T3100E_XSIZE != xsize) || (T3100E_YSIZE != ysize) || video_force_resize_get())
{
xsize = T3100E_XSIZE;
ysize = T3100E_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, xsize, ysize);
frames++;
/* Fixed 640x400 resolution */
video_res_x = T3100E_XSIZE;
video_res_y = T3100E_YSIZE;
if (t3100e->cga.cgamode & 0x02)
{
if (t3100e->cga.cgamode & 0x10)
video_bpp = 1;
else video_bpp = 2;
}
else video_bpp = 0;
t3100e->cga.cgablink++;
}
}
}
void t3100e_recalcattrs(t3100e_t *t3100e)
{
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 */
amber = makecol(0xf7, 0x7C, 0x34);
black = makecol(0x17, 0x0C, 0x00);
/* Initialise the attribute mapping. Start by defaulting everything
* to black on amber, and with bold set by bit 3 */
for (n = 0; n < 256; n++)
{
boldcols[n] = (n & 8) != 0;
blinkcols[n][0] = normcols[n][0] = amber;
blinkcols[n][1] = normcols[n][1] = black;
}
/* Colours 0x11-0xFF are controlled by bits 2 and 3 of the
* passed value. Exclude x0 and x8, which are always black on
* amber. */
for (n = 0x11; n <= 0xFF; n++)
{
if ((n & 7) == 0) continue;
if (t3100e->attrmap & 4) /* Inverse */
{
blinkcols[n][0] = normcols[n][0] = amber;
blinkcols[n][1] = normcols[n][1] = black;
}
else /* Normal */
{
blinkcols[n][0] = normcols[n][0] = black;
blinkcols[n][1] = normcols[n][1] = amber;
}
if (t3100e->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 (t3100e->attrmap & 1)
{
blinkcols[n][0] = normcols[n][0] = amber;
blinkcols[n][1] = normcols[n][1] = black;
blinkcols[n+128][0] = amber;
blinkcols[n+128][1] = black;
}
else
{
blinkcols[n][0] = normcols[n][0] = black;
blinkcols[n][1] = normcols[n][1] = amber;
blinkcols[n+128][0] = black;
blinkcols[n+128][1] = amber;
}
if (t3100e->attrmap & 2) boldcols[n] = 1;
}
/* Colours 07 and 0F are always amber on black. If blinking is
* enabled so are 87 and 8F. */
for (n = 0x07; n <= 0x0F; n += 8)
{
blinkcols[n][0] = normcols[n][0] = black;
blinkcols[n][1] = normcols[n][1] = amber;
blinkcols[n+128][0] = black;
blinkcols[n+128][1] = amber;
}
/* When not blinking, colours 81-8F are always amber on black. */
for (n = 0x81; n <= 0x8F; n ++)
{
normcols[n][0] = black;
normcols[n][1] = amber;
boldcols[n] = (n & 0x08) != 0;
}
/* Finally do the ones which are solid black. These differ between
* the normal and blinking mappings */
for (n = 0; n <= 0xFF; n += 0x11)
{
normcols[n][0] = normcols[n][1] = black;
}
/* In the blinking range, 00 11 22 .. 77 and 80 91 A2 .. F7 are black */
for (n = 0; n <= 0x77; n += 0x11)
{
blinkcols[n][0] = blinkcols[n][1] = black;
blinkcols[n+128][0] = blinkcols[n+128][1] = black;
}
}
void *t3100e_init(const device_t *info)
{
t3100e_t *t3100e = malloc(sizeof(t3100e_t));
memset(t3100e, 0, sizeof(t3100e_t));
loadfont("roms/machines/t3100e/t3100e_font.bin", 5);
cga_init(&t3100e->cga);
video_inform(VIDEO_FLAG_TYPE_CGA, &timing_t3100e);
t3100e->internal = 1;
/* 32k video RAM */
t3100e->vram = malloc(0x8000);
timer_set_callback(&t3100e->cga.timer, t3100e_poll);
timer_set_p(&t3100e->cga.timer, t3100e);
/* Occupy memory between 0xB8000 and 0xBFFFF */
mem_mapping_add(&t3100e->mapping, 0xb8000, 0x8000, t3100e_read, NULL, NULL, t3100e_write, NULL, NULL, NULL, 0, t3100e);
/* Respond to CGA I/O ports */
io_sethandler(0x03d0, 0x000c, t3100e_in, NULL, NULL, t3100e_out, NULL, NULL, t3100e);
/* Default attribute mapping is 4 */
t3100e->attrmap = 4;
t3100e_recalcattrs(t3100e);
/* Start off in 80x25 text mode */
t3100e->cga.cgastat = 0xF4;
t3100e->cga.vram = t3100e->vram;
t3100e->enabled = 1;
t3100e->video_options = 0xFF;
return t3100e;
}
void t3100e_close(void *p)
{
t3100e_t *t3100e = (t3100e_t *)p;
free(t3100e->vram);
free(t3100e);
}
void t3100e_speed_changed(void *p)
{
t3100e_t *t3100e = (t3100e_t *)p;
t3100e_recalctimings(t3100e);
}
const device_t t3100e_device = {
.name = "Toshiba T3100e",
.internal_name = "t3100e",
.flags = 0,
.local = 0,
.init = t3100e_init,
.close = t3100e_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = t3100e_speed_changed,
.force_redraw = NULL,
.config = NULL
};
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