Added Compaq CGA emulation. Patch from John Elliott.
This commit is contained in:
SarahW
parent
0ee7c7a354
commit
dd590d2093
14 changed files with 408 additions and 11 deletions
393
src/vid_compaq_cga.c
Normal file
393
src/vid_compaq_cga.c
Normal file
|
|
@ -0,0 +1,393 @@
|
|||
/*Compaq CGA emulation*/
|
||||
#include <stdlib.h>
|
||||
#include "ibm.h"
|
||||
#include "device.h"
|
||||
#include "io.h"
|
||||
#include "mem.h"
|
||||
#include "timer.h"
|
||||
#include "video.h"
|
||||
#include "vid_cga.h"
|
||||
#include "vid_compaq_cga.h"
|
||||
|
||||
typedef struct compaq_cga_t
|
||||
{
|
||||
cga_t cga;
|
||||
|
||||
} compaq_cga_t;
|
||||
|
||||
static uint8_t mdaattr[256][2][2];
|
||||
|
||||
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 = (int)(_dispontime * (1 << TIMER_SHIFT));
|
||||
self->cga.dispofftime = (int)(_dispofftime * (1 << TIMER_SHIFT));
|
||||
}
|
||||
|
||||
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;
|
||||
int oldvc;
|
||||
uint8_t chr, attr;
|
||||
uint32_t cols[4];
|
||||
int oldsc;
|
||||
int underline;
|
||||
int blink;
|
||||
|
||||
/* If in graphics mode or character height is not 13, behave as CGA */
|
||||
if ((self->cga.cgamode & 0x12) || (self->cga.crtc[9] != 13))
|
||||
{
|
||||
cga_poll(&self->cga);
|
||||
return;
|
||||
}
|
||||
|
||||
/* We are in Compaq 350-line CGA territory */
|
||||
if (!self->cga.linepos)
|
||||
{
|
||||
self->cga.vidtime += 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();
|
||||
// printf("Firstline %i\n",firstline);
|
||||
}
|
||||
self->cga.lastline = self->cga.displine;
|
||||
|
||||
cols[0] = (self->cga.cgacol & 15);
|
||||
|
||||
for (c = 0; c < 8; c++)
|
||||
{
|
||||
((uint32_t *)buffer32->line[self->cga.displine])[c] = cols[0];
|
||||
if (self->cga.cgamode & 1)
|
||||
((uint32_t *)buffer32->line[self->cga.displine])[c + (self->cga.crtc[1] << 3) + 8] = cols[0];
|
||||
else
|
||||
((uint32_t *)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);
|
||||
underline = 0;
|
||||
blink = ((self->cga.cgablink & 8) && (self->cga.cgamode & 0x20) && (attr & 0x80) && !drawcursor);
|
||||
if (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;
|
||||
cols[0] = (attr >> 4) & 7;
|
||||
if (blink)
|
||||
cols[1] = cols[0];
|
||||
}
|
||||
else
|
||||
{
|
||||
cols[1] = attr & 15;
|
||||
cols[0] = attr >> 4;
|
||||
}
|
||||
if (underline)
|
||||
{
|
||||
for (c = 0; c < 8; c++)
|
||||
((uint32_t *)buffer32->line[self->cga.displine])[(x << 3) + c + 8] = mdaattr[attr][blink][1];
|
||||
}
|
||||
else if (drawcursor)
|
||||
{
|
||||
for (c = 0; c < 8; c++)
|
||||
((uint32_t *)buffer32->line[self->cga.displine])[(x << 3) + c + 8] = cols[(fontdatm[chr + self->cga.fontbase][self->cga.sc & 15] & (1 << (c ^ 7))) ? 1 : 0] ^ 0xffffff;
|
||||
}
|
||||
else
|
||||
{
|
||||
for (c = 0; c < 8; c++)
|
||||
((uint32_t *)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);
|
||||
underline = 0;
|
||||
blink = ((self->cga.cgablink & 8) && (self->cga.cgamode & 0x20) && (attr & 0x80) && !drawcursor);
|
||||
if (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;
|
||||
cols[0] = (attr >> 4) & 7;
|
||||
if (blink)
|
||||
cols[1] = cols[0];
|
||||
}
|
||||
else
|
||||
{
|
||||
cols[1] = attr & 15;
|
||||
cols[0] = attr >> 4;
|
||||
}
|
||||
self->cga.ma++;
|
||||
if (underline)
|
||||
{
|
||||
for (c = 0; c < 8; c++)
|
||||
((uint32_t *)buffer32->line[self->cga.displine])[(x << 4)+(c << 1) + 8] =
|
||||
((uint32_t *)buffer32->line[self->cga.displine])[(x << 4)+(c << 1) + 9] = mdaattr[attr][blink][1];
|
||||
}
|
||||
else if (drawcursor)
|
||||
{
|
||||
for (c = 0; c < 8; c++)
|
||||
((uint32_t *)buffer32->line[self->cga.displine])[(x << 4)+(c << 1) + 8] =
|
||||
((uint32_t *)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] ^ 0xffffff;
|
||||
}
|
||||
else
|
||||
{
|
||||
for (c = 0; c < 8; c++)
|
||||
((uint32_t *)buffer32->line[self->cga.displine])[(x << 4) + (c << 1) + 8] =
|
||||
((uint32_t *)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);
|
||||
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;
|
||||
|
||||
for (c = 0; c < x; c++)
|
||||
((uint32_t *)buffer32->line[self->cga.displine])[c] = cgapal[((uint32_t *)buffer32->line[self->cga.displine])[c] & 0xf];
|
||||
|
||||
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
|
||||
{
|
||||
self->cga.vidtime += 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])
|
||||
{
|
||||
if (self->cga.cgamode & 1) x = (self->cga.crtc[1] << 3) + 16;
|
||||
else x = (self->cga.crtc[1] << 4) + 16;
|
||||
self->cga.lastline++;
|
||||
if (x != xsize || (self->cga.lastline - self->cga.firstline) != ysize)
|
||||
{
|
||||
xsize = x;
|
||||
ysize = self->cga.lastline - self->cga.firstline;
|
||||
|
||||
if (xsize < 64) xsize = 656;
|
||||
if (ysize < 32) ysize = 200;
|
||||
updatewindowsize(xsize, ysize + 16);
|
||||
}
|
||||
|
||||
video_blit_memtoscreen(0, self->cga.firstline - 4, 0, (self->cga.lastline - self->cga.firstline) + 8, xsize, (self->cga.lastline - self->cga.firstline) + 8);
|
||||
frames++;
|
||||
|
||||
video_res_x = 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()
|
||||
{
|
||||
int display_type;
|
||||
int contrast;
|
||||
int c;
|
||||
compaq_cga_t *self = malloc(sizeof(compaq_cga_t));
|
||||
memset(self, 0, sizeof(compaq_cga_t));
|
||||
|
||||
self->cga.vram = malloc(0x4000);
|
||||
|
||||
timer_add(compaq_cga_poll, &self->cga.vidtime, TIMER_ALWAYS_ENABLED, self);
|
||||
mem_mapping_add(&self->cga.mapping, 0xb8000, 0x08000, cga_read, NULL, NULL, cga_write, NULL, NULL, NULL, MEM_MAPPING_EXTERNAL, self);
|
||||
io_sethandler(0x03d0, 0x0010, cga_in, NULL, NULL, cga_out, NULL, NULL, self);
|
||||
|
||||
display_type = device_get_config_int("display_type");
|
||||
contrast = device_get_config_int("contrast");
|
||||
cgapal_rebuild(display_type, contrast);
|
||||
|
||||
for (c = 0; c < 256; c++)
|
||||
{
|
||||
mdaattr[c][0][0] = mdaattr[c][1][0] = mdaattr[c][1][1] = 0;
|
||||
if (c & 8) mdaattr[c][0][1] = 0xf;
|
||||
else mdaattr[c][0][1] = 0x7;
|
||||
}
|
||||
mdaattr[0x70][0][1] = 0;
|
||||
mdaattr[0x70][0][0] = mdaattr[0x70][1][0] = mdaattr[0x70][1][1] = 0xf;
|
||||
mdaattr[0xF0][0][1] = 0;
|
||||
mdaattr[0xF0][0][0] = mdaattr[0xF0][1][0] = mdaattr[0xF0][1][1] = 0xf;
|
||||
mdaattr[0x78][0][1] = 0x7;
|
||||
mdaattr[0x78][0][0] = mdaattr[0x78][1][0] = mdaattr[0x78][1][1] = 0xf;
|
||||
mdaattr[0xF8][0][1] = 0x7;
|
||||
mdaattr[0xF8][0][0] = mdaattr[0xF8][1][0] = mdaattr[0xF8][1][1] = 0xf;
|
||||
mdaattr[0x00][0][1] = mdaattr[0x00][1][1] = 0;
|
||||
mdaattr[0x08][0][1] = mdaattr[0x08][1][1] = 0;
|
||||
mdaattr[0x80][0][1] = mdaattr[0x80][1][1] = 0;
|
||||
mdaattr[0x88][0][1] = mdaattr[0x88][1][1] = 0;
|
||||
|
||||
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 device_config_t cga_config[];
|
||||
|
||||
device_t compaq_cga_device =
|
||||
{
|
||||
"Compaq CGA",
|
||||
0,
|
||||
compaq_cga_init,
|
||||
compaq_cga_close,
|
||||
NULL,
|
||||
compaq_cga_speed_changed,
|
||||
NULL,
|
||||
NULL,
|
||||
cga_config
|
||||
};
|
||||
Loading…
Reference in a new issue