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41ba2e4e34ba3aef31e04bb162f474337ac98101
86Box/src/video/vid_compaq_cga.c
OBattler a495faec59 Direct3D in full-screen mode now transfers control of input to the full screen window, fixes #429; 
Unified screenshot code and moved it to video.c, it is now independent of both renderer and platform;
The EGA/(S)VGA overscan now also works for CGA, PCjr, Tandy, and CGA-using Amstrads;
Fixed EGA/(S)VGA overscan operation so it works correctly with scrolling and panning;
Fixed 320x200x32K and 320x200x64K modes on the ET4000/W32p;
Fixed the Video 7 1024i chip ID and video memory options, fixes #431;
Fixed a banking bug in the S3 cards, fixes Windows 9x and NeoPaint.
2019-10-20 15:09:38 +02:00

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/*
* 86Box A hypervisor and IBM PC system emulator that specializes in
* running old operating systems and software designed for IBM
* PC systems and compatibles from 1981 through fairly recent
* system designs based on the PCI bus.
*
* This file is part of the 86Box distribution.
*
* Emulation of the Compaq CGA graphics cards.
*
* Version: @(#)vid_compaq_cga.c 1.0.0 2019/01/02
*
* Authors: John Elliott, <jce@seasip.info>
* Sarah Walker, <http://pcem-emulator.co.uk/>
* Miran Grca, <mgrca8@gmail.com>
*
* Copyright 2016-2019 John Elliott.
* Copyright 2008-2019 Sarah Walker.
* Copyright 2016-2019 Miran Grca.
*/
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <wchar.h>
#include <math.h>
#include "../86box.h"
#include "../cpu/cpu.h"
#include "../io.h"
#include "../timer.h"
#include "../pit.h"
#include "../mem.h"
#include "../rom.h"
#include "../device.h"
#include "video.h"
#include "vid_cga.h"
#include "vid_cga_comp.h"
#define CGA_RGB 0
#define CGA_COMPOSITE 1
static uint32_t vflags;
static uint8_t mdaattr[256][2][2];
typedef struct compaq_cga_t
{
cga_t cga;
} compaq_cga_t;
#ifdef ENABLE_COMPAQ_CGA_LOG
int compaq_cga_do_log = ENABLE_COMPAQ_CGA_LOG;
static void
compaq_cga_log(const char *fmt, ...)
{
va_list ap;
if (compaq_cga_do_log) {
va_start(ap, fmt);
pclog_ex(fmt, ap);
va_end(ap);
}
}
#else
#define compaq_cga_log(fmt, ...)
#endif
void
compaq_cga_recalctimings(compaq_cga_t *self)
{
double _dispontime, _dispofftime, disptime;
disptime = self->cga.crtc[0] + 1;
_dispontime = self->cga.crtc[1];
_dispofftime = disptime - _dispontime;
_dispontime *= MDACONST;
_dispofftime *= MDACONST;
self->cga.dispontime = (uint64_t)(_dispontime);
self->cga.dispofftime = (uint64_t)(_dispofftime);
}
void
compaq_cga_poll(void *p)
{
compaq_cga_t *self = (compaq_cga_t *)p;
uint16_t ca = (self->cga.crtc[15] | (self->cga.crtc[14] << 8)) & 0x3fff;
int drawcursor;
int x, c, xs_temp, ys_temp;
int oldvc;
uint8_t chr, attr;
uint8_t border;
uint8_t cols[4];
int oldsc;
int underline = 0;
int blink = 0;
/* If in graphics mode or character height is not 13, behave as CGA */
if ((self->cga.cgamode & 0x12) || (self->cga.crtc[9] != 13)) {
overscan_x = overscan_y = 16;
cga_poll(&self->cga);
return;
} else
overscan_x = overscan_y = 0;
/* We are in Compaq 350-line CGA territory */
if (!self->cga.linepos) {
timer_advance_u64(&self->cga.timer, self->cga.dispofftime);
self->cga.cgastat |= 1;
self->cga.linepos = 1;
oldsc = self->cga.sc;
if ((self->cga.crtc[8] & 3) == 3)
self->cga.sc = ((self->cga.sc << 1) + self->cga.oddeven) & 7;
if (self->cga.cgadispon) {
if (self->cga.displine < self->cga.firstline) {
self->cga.firstline = self->cga.displine;
video_wait_for_buffer();
compaq_cga_log("Firstline %i\n", firstline);
}
self->cga.lastline = self->cga.displine;
cols[0] = (self->cga.cgacol & 15) + 16;
for (c = 0; c < 8; c++) {
buffer32->line[self->cga.displine][c] = cols[0];
if (self->cga.cgamode & 1)
buffer32->line[self->cga.displine][c + (self->cga.crtc[1] << 3) + 8] = cols[0];
else
buffer32->line[self->cga.displine][c + (self->cga.crtc[1] << 4) + 8] = cols[0];
}
if (self->cga.cgamode & 1) {
for (x = 0; x < self->cga.crtc[1]; x++) {
chr = self->cga.charbuffer[x << 1];
attr = self->cga.charbuffer[(x << 1) + 1];
drawcursor = ((self->cga.ma == ca) && self->cga.con && self->cga.cursoron);
if (vflags) {
underline = 0;
blink = ((self->cga.cgablink & 8) && (self->cga.cgamode & 0x20) && (attr & 0x80) && !drawcursor);
}
if (vflags && (self->cga.cgamode & 0x80)) {
cols[0] = mdaattr[attr][blink][0];
cols[1] = mdaattr[attr][blink][1];
if ((self->cga.sc == 12) && ((attr & 7) == 1))
underline = 1;
} else if (self->cga.cgamode & 0x20) {
cols[1] = (attr & 15) + 16;
cols[0] = ((attr >> 4) & 7) + 16;
if (vflags) {
if (blink)
cols[1] = cols[0];
} else {
if ((self->cga.cgablink & 8) && (attr & 0x80) && !self->cga.drawcursor)
cols[1] = cols[0];
}
} else {
cols[1] = (attr & 15) + 16;
cols[0] = (attr >> 4) + 16;
}
if (vflags && underline) {
for (c = 0; c < 8; c++)
buffer32->line[self->cga.displine][(x << 3) + c + 8] = mdaattr[attr][blink][1];
} else if (drawcursor) {
for (c = 0; c < 8; c++)
buffer32->line[self->cga.displine][(x << 3) + c + 8] = cols[(fontdatm[chr + self->cga.fontbase][self->cga.sc & 15] & (1 << (c ^ 7))) ? 1 : 0] ^ 15;
} else {
for (c = 0; c < 8; c++)
buffer32->line[self->cga.displine][(x << 3) + c + 8] = cols[(fontdatm[chr + self->cga.fontbase][self->cga.sc & 15] & (1 << (c ^ 7))) ? 1 : 0];
}
self->cga.ma++;
}
} else {
for (x = 0; x < self->cga.crtc[1]; x++) {
chr = self->cga.vram[((self->cga.ma << 1) & 0x3fff)];
attr = self->cga.vram[(((self->cga.ma << 1) + 1) & 0x3fff)];
drawcursor = ((self->cga.ma == ca) && self->cga.con && self->cga.cursoron);
if (vflags) {
underline = 0;
blink = ((self->cga.cgablink & 8) && (self->cga.cgamode & 0x20) && (attr & 0x80) && !drawcursor);
}
if (vflags && (self->cga.cgamode & 0x80)) {
cols[0] = mdaattr[attr][blink][0];
cols[1] = mdaattr[attr][blink][1];
if (self->cga.sc == 12 && (attr & 7) == 1) underline = 1;
} else if (self->cga.cgamode & 0x20) {
cols[1] = (attr & 15) + 16;
cols[0] = ((attr >> 4) & 7) + 16;
if (vflags) {
if (blink)
cols[1] = cols[0];
} else {
if ((self->cga.cgablink & 8) && (attr & 0x80) && !self->cga.drawcursor)
cols[1] = cols[0];
}
} else {
cols[1] = (attr & 15) + 16;
cols[0] = (attr >> 4) + 16;
}
self->cga.ma++;
if (vflags && underline) {
for (c = 0; c < 8; c++)
buffer32->line[self->cga.displine][(x << 4)+(c << 1) + 8] =
buffer32->line[self->cga.displine][(x << 4)+(c << 1) + 9] = mdaattr[attr][blink][1];
} else if (drawcursor) {
for (c = 0; c < 8; c++)
buffer32->line[self->cga.displine][(x << 4)+(c << 1) + 8] =
buffer32->line[self->cga.displine][(x << 4) + (c << 1) + 1 + 8] =
cols[(fontdatm[chr + self->cga.fontbase][self->cga.sc & 15] & (1 << (c ^ 7))) ? 1 : 0] ^ 15;
} else {
for (c = 0; c < 8; c++)
buffer32->line[self->cga.displine][(x << 4) + (c << 1) + 8] =
buffer32->line[self->cga.displine][(x << 4) + (c << 1) + 1 + 8] =
cols[(fontdatm[chr + self->cga.fontbase][self->cga.sc & 15] & (1 << (c ^ 7))) ? 1 : 0];
}
}
}
} else {
cols[0] = (self->cga.cgacol & 15) + 16;
if (self->cga.cgamode & 1) hline(buffer32, 0, self->cga.displine, (self->cga.crtc[1] << 3) + 16, cols[0]);
else hline(buffer32, 0, self->cga.displine, (self->cga.crtc[1] << 4) + 16, cols[0]);
}
if (self->cga.cgamode & 1) x = (self->cga.crtc[1] << 3) + 16;
else x = (self->cga.crtc[1] << 4) + 16;
if (self->cga.composite) {
if (self->cga.cgamode & 0x10)
border = 0x00;
else
border = self->cga.cgacol & 0x0f;
if (vflags)
Composite_Process(self->cga.cgamode & 0x7f, border, x >> 2, buffer32->line[self->cga.displine]);
else
Composite_Process(self->cga.cgamode, border, x >> 2, buffer32->line[self->cga.displine]);
}
self->cga.sc = oldsc;
if (self->cga.vc == self->cga.crtc[7] && !self->cga.sc)
self->cga.cgastat |= 8;
self->cga.displine++;
if (self->cga.displine >= 500)
self->cga.displine = 0;
} else {
timer_advance_u64(&self->cga.timer, self->cga.dispontime);
self->cga.linepos = 0;
if (self->cga.vsynctime) {
self->cga.vsynctime--;
if (!self->cga.vsynctime)
self->cga.cgastat &= ~8;
}
if (self->cga.sc == (self->cga.crtc[11] & 31) || ((self->cga.crtc[8] & 3) == 3 && self->cga.sc == ((self->cga.crtc[11] & 31) >> 1))) {
self->cga.con = 0;
self->cga.coff = 1;
}
if ((self->cga.crtc[8] & 3) == 3 && self->cga.sc == (self->cga.crtc[9] >> 1))
self->cga.maback = self->cga.ma;
if (self->cga.vadj) {
self->cga.sc++;
self->cga.sc &= 31;
self->cga.ma = self->cga.maback;
self->cga.vadj--;
if (!self->cga.vadj) {
self->cga.cgadispon = 1;
self->cga.ma = self->cga.maback = (self->cga.crtc[13] | (self->cga.crtc[12] << 8)) & 0x3fff;
self->cga.sc = 0;
}
} else if (self->cga.sc == self->cga.crtc[9]) {
self->cga.maback = self->cga.ma;
self->cga.sc = 0;
oldvc = self->cga.vc;
self->cga.vc++;
self->cga.vc &= 127;
if (self->cga.vc == self->cga.crtc[6])
self->cga.cgadispon = 0;
if (oldvc == self->cga.crtc[4]) {
self->cga.vc = 0;
self->cga.vadj = self->cga.crtc[5];
if (!self->cga.vadj) self->cga.cgadispon = 1;
if (!self->cga.vadj) self->cga.ma = self->cga.maback = (self->cga.crtc[13] | (self->cga.crtc[12] << 8)) & 0x3fff;
if ((self->cga.crtc[10] & 0x60) == 0x20)
self->cga.cursoron = 0;
else
self->cga.cursoron = self->cga.cgablink & 8;
}
if (self->cga.vc == self->cga.crtc[7]) {
self->cga.cgadispon = 0;
self->cga.displine = 0;
self->cga.vsynctime = 16;
if (self->cga.crtc[7]) {
compaq_cga_log("Lastline %i Firstline %i %i\n", self->cga.lastline,
self->cga.firstline ,self->cga.lastline - self->cga.firstline);
if (self->cga.cgamode & 1) x = (self->cga.crtc[1] << 3);
else x = (self->cga.crtc[1] << 4);
self->cga.lastline++;
xs_temp = x;
ys_temp = (self->cga.lastline - self->cga.firstline);
if ((xs_temp > 0) && (ys_temp > 0)) {
if (xsize < 64) xs_temp = 656;
if (ysize < 32) ys_temp = 400;
if (!enable_overscan)
xsize -= 16;
if ((self->cga.cgamode & 8) && ((xs_temp != xsize) || (ys_temp != ysize) || video_force_resize_get())) {
xsize = xs_temp;
ysize = ys_temp;
set_screen_size(xsize, ysize + (enable_overscan ? 16 : 0));
if (video_force_resize_get())
video_force_resize_set(0);
}
if (enable_overscan) {
if (self->cga.composite)
video_blit_memtoscreen(0, self->cga.firstline - 8, 0, ysize + 16, xsize + 16, ysize + 16);
else
video_blit_memtoscreen_8(0, self->cga.firstline - 8, 0, ysize + 16, xsize + 16, ysize + 16);
} else {
if (self->cga.composite)
video_blit_memtoscreen(8, self->cga.firstline, 0, ysize, xsize, ysize);
else
video_blit_memtoscreen_8(8, self->cga.firstline, 0, ysize, xsize, ysize);
}
}
frames++;
video_res_x = xsize;
if (enable_overscan)
xsize -= 16;
video_res_y = ysize;
if (self->cga.cgamode & 1) {
video_res_x /= 8;
video_res_y /= self->cga.crtc[9] + 1;
video_bpp = 0;
} else if (!(self->cga.cgamode & 2)) {
video_res_x /= 16;
video_res_y /= self->cga.crtc[9] + 1;
video_bpp = 0;
} else if (!(self->cga.cgamode & 16)) {
video_res_x /= 2;
video_bpp = 2;
} else
video_bpp = 1;
}
self->cga.firstline = 1000;
self->cga.lastline = 0;
self->cga.cgablink++;
self->cga.oddeven ^= 1;
}
} else {
self->cga.sc++;
self->cga.sc &= 31;
self->cga.ma = self->cga.maback;
}
if (self->cga.cgadispon)
self->cga.cgastat &= ~1;
if ((self->cga.sc == (self->cga.crtc[10] & 31) || ((self->cga.crtc[8] & 3) == 3 && self->cga.sc == ((self->cga.crtc[10] & 31) >> 1))))
self->cga.con = 1;
if (self->cga.cgadispon && (self->cga.cgamode & 1)) {
for (x = 0; x < (self->cga.crtc[1] << 1); x++)
self->cga.charbuffer[x] = self->cga.vram[(((self->cga.ma << 1) + x) & 0x3fff)];
}
}
}
void *
compaq_cga_init(const device_t *info)
{
int display_type;
int c;
compaq_cga_t *self = malloc(sizeof(compaq_cga_t));
memset(self, 0, sizeof(compaq_cga_t));
display_type = device_get_config_int("display_type");
self->cga.composite = (display_type != CGA_RGB);
self->cga.revision = device_get_config_int("composite_type");
self->cga.snow_enabled = device_get_config_int("snow_enabled");
self->cga.vram = malloc(0x4000);
cga_comp_init(self->cga.revision);
timer_add(&self->cga.timer, compaq_cga_poll, self, 1);
mem_mapping_add(&self->cga.mapping, 0xb8000, 0x08000, cga_read, NULL, NULL, cga_write, NULL, NULL, NULL /*self->cga.vram*/, MEM_MAPPING_EXTERNAL, self);
io_sethandler(0x03d0, 0x0010, cga_in, NULL, NULL, cga_out, NULL, NULL, self);
if (info->local) {
for (c = 0; c < 256; c++) {
mdaattr[c][0][0] = mdaattr[c][1][0] = mdaattr[c][1][1] = 16;
if (c & 8) mdaattr[c][0][1] = 15 + 16;
else mdaattr[c][0][1] = 7 + 16;
}
mdaattr[0x70][0][1] = 16;
mdaattr[0x70][0][0] = mdaattr[0x70][1][0] = mdaattr[0x70][1][1] = 16 + 15;
mdaattr[0xF0][0][1] = 16;
mdaattr[0xF0][0][0] = mdaattr[0xF0][1][0] = mdaattr[0xF0][1][1] = 16 + 15;
mdaattr[0x78][0][1] = 16 + 7;
mdaattr[0x78][0][0] = mdaattr[0x78][1][0] = mdaattr[0x78][1][1] = 16 + 15;
mdaattr[0xF8][0][1] = 16 + 7;
mdaattr[0xF8][0][0] = mdaattr[0xF8][1][0] = mdaattr[0xF8][1][1] = 16 + 15;
mdaattr[0x00][0][1] = mdaattr[0x00][1][1] = 16;
mdaattr[0x08][0][1] = mdaattr[0x08][1][1] = 16;
mdaattr[0x80][0][1] = mdaattr[0x80][1][1] = 16;
mdaattr[0x88][0][1] = mdaattr[0x88][1][1] = 16;
}
vflags = info->local;
overscan_x = overscan_y = 16;
self->cga.rgb_type = device_get_config_int("rgb_type");
cga_palette = (self->cga.rgb_type << 1);
cgapal_rebuild();
self->cga.crtc[9] = 13;
return self;
}
void
compaq_cga_close(void *p)
{
compaq_cga_t *self = (compaq_cga_t *)p;
free(self->cga.vram);
free(self);
}
void
compaq_cga_speed_changed(void *p)
{
compaq_cga_t *self = (compaq_cga_t *)p;
if (self->cga.crtc[9] == 13) /* Character height */
compaq_cga_recalctimings(self);
else
cga_recalctimings(&self->cga);
}
extern const device_config_t cga_config[];
const device_t compaq_cga_device =
{
"Compaq CGA",
DEVICE_ISA, 0,
compaq_cga_init,
compaq_cga_close,
NULL,
NULL,
compaq_cga_speed_changed,
NULL,
cga_config
};
const device_t compaq_cga_2_device =
{
"Compaq CGA 2",
DEVICE_ISA, 1,
compaq_cga_init,
compaq_cga_close,
NULL,
NULL,
compaq_cga_speed_changed,
NULL,
cga_config
};
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