6856a77e2d
Re-added the ATi Mach64GX ISA, this time with a working BIOS; Fixed some CGA/EGA/(S)VGA timing mess-ups.
587 lines
24 KiB
C
587 lines
24 KiB
C
/*
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* 86Box A hypervisor and IBM PC system emulator that specializes in
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* running old operating systems and software designed for IBM
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* PC systems and compatibles from 1981 through fairly recent
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* system designs based on the PCI bus.
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*
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* This file is part of the 86Box distribution.
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*
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* Emulation of the old and new IBM CGA graphics cards.
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*
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* Version: @(#)vid_cga.c 1.0.13 2018/01/25
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*
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* Authors: Sarah Walker, <http://pcem-emulator.co.uk/>
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* Miran Grca, <mgrca8@gmail.com>
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*
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* Copyright 2008-2018 Sarah Walker.
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* Copyright 2016-2018 Miran Grca.
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <stdlib.h>
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#include <wchar.h>
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#include <math.h>
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#include "../86box.h"
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#include "../cpu/cpu.h"
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#include "../io.h"
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#include "../pit.h"
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#include "../mem.h"
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#include "../rom.h"
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#include "../timer.h"
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#include "../device.h"
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#include "video.h"
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#include "vid_cga.h"
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#include "vid_cga_comp.h"
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#define CGA_RGB 0
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#define CGA_COMPOSITE 1
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#define COMPOSITE_OLD 0
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#define COMPOSITE_NEW 1
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static uint8_t crtcmask[32] =
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{
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0xff, 0xff, 0xff, 0xff, 0x7f, 0x1f, 0x7f, 0x7f, 0xf3, 0x1f, 0x7f, 0x1f, 0x3f, 0xff, 0x3f, 0xff,
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0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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void cga_recalctimings(cga_t *cga);
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void cga_out(uint16_t addr, uint8_t val, void *p)
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{
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cga_t *cga = (cga_t *)p;
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uint8_t old;
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switch (addr)
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{
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case 0x3D4:
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cga->crtcreg = val & 31;
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return;
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case 0x3D5:
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old = cga->crtc[cga->crtcreg];
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cga->crtc[cga->crtcreg] = val & crtcmask[cga->crtcreg];
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if (old != val)
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{
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if (cga->crtcreg < 0xe || cga->crtcreg > 0x10)
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{
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fullchange = changeframecount;
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cga_recalctimings(cga);
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}
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}
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return;
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case 0x3D8:
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if (((cga->cgamode ^ val) & 5) != 0)
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{
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cga->cgamode = val;
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update_cga16_color(cga->cgamode);
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}
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if ((cga->cgamode ^ val) & 1)
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{
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cga_palette = (cga->rgb_type << 1);
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cgapal_rebuild();
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}
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cga->cgamode = val;
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return;
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case 0x3D9:
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cga->cgacol = val;
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return;
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}
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}
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uint8_t cga_in(uint16_t addr, void *p)
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{
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cga_t *cga = (cga_t *)p;
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switch (addr)
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{
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case 0x3D4:
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return cga->crtcreg;
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case 0x3D5:
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return cga->crtc[cga->crtcreg];
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case 0x3DA:
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return cga->cgastat;
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}
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return 0xFF;
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}
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void cga_write(uint32_t addr, uint8_t val, void *p)
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{
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cga_t *cga = (cga_t *)p;
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cga->vram[addr & 0x3fff] = val;
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if (cga->snow_enabled)
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{
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cga->charbuffer[ ((int)(((cga->dispontime - cga->vidtime) * 2) / CGACONST)) & 0xfc] = val;
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cga->charbuffer[(((int)(((cga->dispontime - cga->vidtime) * 2) / CGACONST)) & 0xfc) | 1] = val;
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}
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egawrites++;
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cycles -= 4;
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}
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uint8_t cga_read(uint32_t addr, void *p)
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{
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cga_t *cga = (cga_t *)p;
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cycles -= 4;
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if (cga->snow_enabled)
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{
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cga->charbuffer[ ((int)(((cga->dispontime - cga->vidtime) * 2) / CGACONST)) & 0xfc] = cga->vram[addr & 0x3fff];
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cga->charbuffer[(((int)(((cga->dispontime - cga->vidtime) * 2) / CGACONST)) & 0xfc) | 1] = cga->vram[addr & 0x3fff];
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}
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egareads++;
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return cga->vram[addr & 0x3fff];
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}
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void cga_recalctimings(cga_t *cga)
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{
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double disptime;
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double _dispontime, _dispofftime;
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/* pclog("Recalc - %i %i %i\n", cga->crtc[0], cga->crtc[1], cga->cgamode & 1); */
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if (cga->cgamode & 1)
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{
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disptime = (double) (cga->crtc[0] + 1);
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_dispontime = (double) cga->crtc[1];
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}
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else
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{
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disptime = (double) ((cga->crtc[0] + 1) << 1);
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_dispontime = (double) (cga->crtc[1] << 1);
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}
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_dispofftime = disptime - _dispontime;
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_dispontime = _dispontime * CGACONST;
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_dispofftime = _dispofftime * CGACONST;
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cga->dispontime = (int64_t)(_dispontime * (1LL << TIMER_SHIFT));
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cga->dispofftime = (int64_t)(_dispofftime * (1LL << TIMER_SHIFT));
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}
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void cga_poll(void *p)
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{
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cga_t *cga = (cga_t *)p;
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uint16_t ca = (cga->crtc[15] | (cga->crtc[14] << 8)) & 0x3fff;
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int drawcursor;
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int x, c;
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int oldvc;
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uint8_t chr, attr;
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uint16_t dat;
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int cols[4];
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int col;
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int oldsc;
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if (!cga->linepos)
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{
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cga->vidtime += cga->dispofftime;
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cga->cgastat |= 1;
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cga->linepos = 1;
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oldsc = cga->sc;
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if ((cga->crtc[8] & 3) == 3)
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cga->sc = ((cga->sc << 1) + cga->oddeven) & 7;
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if (cga->cgadispon)
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{
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if (cga->displine < cga->firstline)
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{
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cga->firstline = cga->displine;
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video_wait_for_buffer();
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}
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cga->lastline = cga->displine;
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for (c = 0; c < 8; c++)
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{
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if ((cga->cgamode & 0x12) == 0x12)
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{
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buffer->line[cga->displine][c] = 0;
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if (cga->cgamode & 1) buffer->line[cga->displine][c + (cga->crtc[1] << 3) + 8] = 0;
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else buffer->line[cga->displine][c + (cga->crtc[1] << 4) + 8] = 0;
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}
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else
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{
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buffer->line[cga->displine][c] = (cga->cgacol & 15) + 16;
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if (cga->cgamode & 1) buffer->line[cga->displine][c + (cga->crtc[1] << 3) + 8] = (cga->cgacol & 15) + 16;
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else buffer->line[cga->displine][c + (cga->crtc[1] << 4) + 8] = (cga->cgacol & 15) + 16;
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}
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}
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if (cga->cgamode & 1)
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{
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for (x = 0; x < cga->crtc[1]; x++)
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{
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chr = cga->charbuffer[x << 1];
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attr = cga->charbuffer[(x << 1) + 1];
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drawcursor = ((cga->ma == ca) && cga->con && cga->cursoron);
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if (cga->cgamode & 0x20)
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{
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cols[1] = (attr & 15) + 16;
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cols[0] = ((attr >> 4) & 7) + 16;
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if ((cga->cgablink & 8) && (attr & 0x80) && !cga->drawcursor)
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cols[1] = cols[0];
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}
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else
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{
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cols[1] = (attr & 15) + 16;
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cols[0] = (attr >> 4) + 16;
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}
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if (drawcursor)
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{
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for (c = 0; c < 8; c++)
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buffer->line[cga->displine][(x << 3) + c + 8] = cols[(fontdat[chr + cga->fontbase][cga->sc & 7] & (1 << (c ^ 7))) ? 1 : 0] ^ 15;
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}
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else
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{
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for (c = 0; c < 8; c++)
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buffer->line[cga->displine][(x << 3) + c + 8] = cols[(fontdat[chr + cga->fontbase][cga->sc & 7] & (1 << (c ^ 7))) ? 1 : 0];
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}
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cga->ma++;
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}
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}
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else if (!(cga->cgamode & 2))
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{
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for (x = 0; x < cga->crtc[1]; x++)
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{
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chr = cga->vram[((cga->ma << 1) & 0x3fff)];
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attr = cga->vram[(((cga->ma << 1) + 1) & 0x3fff)];
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drawcursor = ((cga->ma == ca) && cga->con && cga->cursoron);
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if (cga->cgamode & 0x20)
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{
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cols[1] = (attr & 15) + 16;
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cols[0] = ((attr >> 4) & 7) + 16;
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if ((cga->cgablink & 8) && (attr & 0x80)) cols[1] = cols[0];
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}
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else
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{
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cols[1] = (attr & 15) + 16;
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cols[0] = (attr >> 4) + 16;
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}
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cga->ma++;
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if (drawcursor)
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{
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for (c = 0; c < 8; c++)
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buffer->line[cga->displine][(x << 4)+(c << 1) + 8] = buffer->line[cga->displine][(x << 4) + (c << 1) + 1 + 8] = cols[(fontdat[chr + cga->fontbase][cga->sc & 7] & (1 << (c ^ 7))) ? 1 : 0] ^ 15;
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}
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else
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{
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for (c = 0; c < 8; c++)
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buffer->line[cga->displine][(x << 4) + (c << 1) + 8] = buffer->line[cga->displine][(x << 4) + (c << 1) + 1 + 8] = cols[(fontdat[chr + cga->fontbase][cga->sc & 7] & (1 << (c ^ 7))) ? 1 : 0];
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}
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}
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}
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else if (!(cga->cgamode & 16))
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{
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cols[0] = (cga->cgacol & 15) | 16;
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col = (cga->cgacol & 16) ? 24 : 16;
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if (cga->cgamode & 4)
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{
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cols[1] = col | 3;
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cols[2] = col | 4;
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cols[3] = col | 7;
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}
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else if (cga->cgacol & 32)
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{
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cols[1] = col | 3;
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cols[2] = col | 5;
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cols[3] = col | 7;
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}
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else
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{
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cols[1] = col | 2;
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cols[2] = col | 4;
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cols[3] = col | 6;
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}
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for (x = 0; x < cga->crtc[1]; x++)
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{
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dat = (cga->vram[((cga->ma << 1) & 0x1fff) + ((cga->sc & 1) * 0x2000)] << 8) | cga->vram[((cga->ma << 1) & 0x1fff) + ((cga->sc & 1) * 0x2000) + 1];
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cga->ma++;
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for (c = 0; c < 8; c++)
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{
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buffer->line[cga->displine][(x << 4) + (c << 1) + 8] =
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buffer->line[cga->displine][(x << 4) + (c << 1) + 1 + 8] = cols[dat >> 14];
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dat <<= 2;
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}
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}
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}
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else
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{
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cols[0] = 0; cols[1] = (cga->cgacol & 15) + 16;
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for (x = 0; x < cga->crtc[1]; x++)
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{
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dat = (cga->vram[((cga->ma << 1) & 0x1fff) + ((cga->sc & 1) * 0x2000)] << 8) | cga->vram[((cga->ma << 1) & 0x1fff) + ((cga->sc & 1) * 0x2000) + 1];
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cga->ma++;
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for (c = 0; c < 16; c++)
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{
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buffer->line[cga->displine][(x << 4) + c + 8] = cols[dat >> 15];
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dat <<= 1;
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}
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}
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}
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}
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else
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{
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cols[0] = ((cga->cgamode & 0x12) == 0x12) ? 0 : (cga->cgacol & 15) + 16;
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if (cga->cgamode & 1) hline(buffer, 0, cga->displine, (cga->crtc[1] << 3) + 16, cols[0]);
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else hline(buffer, 0, cga->displine, (cga->crtc[1] << 4) + 16, cols[0]);
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}
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if (cga->cgamode & 1) x = (cga->crtc[1] << 3) + 16;
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else x = (cga->crtc[1] << 4) + 16;
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if (cga->composite)
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{
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for (c = 0; c < x; c++)
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buffer32->line[cga->displine][c] = buffer->line[cga->displine][c] & 0xf;
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Composite_Process(cga->cgamode, 0, x >> 2, buffer32->line[cga->displine]);
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}
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cga->sc = oldsc;
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if (cga->vc == cga->crtc[7] && !cga->sc)
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cga->cgastat |= 8;
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cga->displine++;
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if (cga->displine >= 360)
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cga->displine = 0;
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}
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else
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{
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cga->vidtime += cga->dispontime;
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cga->linepos = 0;
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if (cga->vsynctime)
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{
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cga->vsynctime--;
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if (!cga->vsynctime)
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cga->cgastat &= ~8;
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}
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if (cga->sc == (cga->crtc[11] & 31) || ((cga->crtc[8] & 3) == 3 && cga->sc == ((cga->crtc[11] & 31) >> 1)))
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{
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cga->con = 0;
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cga->coff = 1;
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}
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if ((cga->crtc[8] & 3) == 3 && cga->sc == (cga->crtc[9] >> 1))
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cga->maback = cga->ma;
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if (cga->vadj)
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{
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cga->sc++;
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cga->sc &= 31;
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cga->ma = cga->maback;
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cga->vadj--;
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if (!cga->vadj)
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{
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cga->cgadispon = 1;
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cga->ma = cga->maback = (cga->crtc[13] | (cga->crtc[12] << 8)) & 0x3fff;
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cga->sc = 0;
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}
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}
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else if (cga->sc == cga->crtc[9])
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{
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cga->maback = cga->ma;
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cga->sc = 0;
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oldvc = cga->vc;
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cga->vc++;
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cga->vc &= 127;
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if (cga->vc == cga->crtc[6])
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cga->cgadispon = 0;
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if (oldvc == cga->crtc[4])
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{
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cga->vc = 0;
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cga->vadj = cga->crtc[5];
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if (!cga->vadj) cga->cgadispon = 1;
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if (!cga->vadj) cga->ma = cga->maback = (cga->crtc[13] | (cga->crtc[12] << 8)) & 0x3fff;
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if ((cga->crtc[10] & 0x60) == 0x20) cga->cursoron = 0;
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else cga->cursoron = cga->cgablink & 8;
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}
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if (cga->vc == cga->crtc[7])
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{
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cga->cgadispon = 0;
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cga->displine = 0;
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cga->vsynctime = 16;
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if (cga->crtc[7])
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{
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if (cga->cgamode & 1) x = (cga->crtc[1] << 3) + 16;
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else x = (cga->crtc[1] << 4) + 16;
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cga->lastline++;
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if ((x != xsize) || ((cga->lastline - cga->firstline) != ysize) || video_force_resize_get())
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{
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xsize = x;
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ysize = cga->lastline - cga->firstline;
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if (xsize < 64) xsize = 656;
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if (ysize < 32) ysize = 200;
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set_screen_size(xsize, (ysize << 1) + 16);
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if (video_force_resize_get())
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video_force_resize_set(0);
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}
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if (cga->composite)
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video_blit_memtoscreen(0, cga->firstline - 4, 0, (cga->lastline - cga->firstline) + 8, xsize, (cga->lastline - cga->firstline) + 8);
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else
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video_blit_memtoscreen_8(0, cga->firstline - 4, 0, (cga->lastline - cga->firstline) + 8, xsize, (cga->lastline - cga->firstline) + 8);
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frames++;
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video_res_x = xsize - 16;
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video_res_y = ysize;
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if (cga->cgamode & 1)
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{
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video_res_x /= 8;
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video_res_y /= cga->crtc[9] + 1;
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video_bpp = 0;
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}
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else if (!(cga->cgamode & 2))
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{
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video_res_x /= 16;
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video_res_y /= cga->crtc[9] + 1;
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video_bpp = 0;
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}
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else if (!(cga->cgamode & 16))
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{
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video_res_x /= 2;
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video_bpp = 2;
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}
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else
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{
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video_bpp = 1;
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}
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}
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cga->firstline = 1000;
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cga->lastline = 0;
|
|
cga->cgablink++;
|
|
cga->oddeven ^= 1;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
cga->sc++;
|
|
cga->sc &= 31;
|
|
cga->ma = cga->maback;
|
|
}
|
|
if (cga->cgadispon)
|
|
cga->cgastat &= ~1;
|
|
if ((cga->sc == (cga->crtc[10] & 31) || ((cga->crtc[8] & 3) == 3 && cga->sc == ((cga->crtc[10] & 31) >> 1))))
|
|
cga->con = 1;
|
|
if (cga->cgadispon && (cga->cgamode & 1))
|
|
{
|
|
for (x = 0; x < (cga->crtc[1] << 1); x++)
|
|
cga->charbuffer[x] = cga->vram[(((cga->ma << 1) + x) & 0x3fff)];
|
|
}
|
|
}
|
|
}
|
|
|
|
void cga_init(cga_t *cga)
|
|
{
|
|
cga->composite = 0;
|
|
}
|
|
|
|
void *cga_standalone_init(device_t *info)
|
|
{
|
|
int display_type;
|
|
cga_t *cga = malloc(sizeof(cga_t));
|
|
memset(cga, 0, sizeof(cga_t));
|
|
|
|
display_type = device_get_config_int("display_type");
|
|
cga->composite = (display_type != CGA_RGB);
|
|
cga->revision = device_get_config_int("composite_type");
|
|
cga->snow_enabled = device_get_config_int("snow_enabled");
|
|
|
|
cga->vram = malloc(0x4000);
|
|
|
|
cga_comp_init(cga->revision);
|
|
timer_add(cga_poll, &cga->vidtime, TIMER_ALWAYS_ENABLED, cga);
|
|
mem_mapping_add(&cga->mapping, 0xb8000, 0x08000, cga_read, NULL, NULL, cga_write, NULL, NULL, NULL, MEM_MAPPING_EXTERNAL, cga);
|
|
io_sethandler(0x03d0, 0x0010, cga_in, NULL, NULL, cga_out, NULL, NULL, cga);
|
|
|
|
overscan_x = overscan_y = 16;
|
|
|
|
cga->rgb_type = device_get_config_int("rgb_type");
|
|
cga_palette = (cga->rgb_type << 1);
|
|
cgapal_rebuild();
|
|
|
|
return cga;
|
|
}
|
|
|
|
void cga_close(void *p)
|
|
{
|
|
cga_t *cga = (cga_t *)p;
|
|
|
|
free(cga->vram);
|
|
free(cga);
|
|
}
|
|
|
|
void cga_speed_changed(void *p)
|
|
{
|
|
cga_t *cga = (cga_t *)p;
|
|
|
|
cga_recalctimings(cga);
|
|
}
|
|
|
|
device_config_t cga_config[] =
|
|
{
|
|
{
|
|
"display_type", "Display type", CONFIG_SELECTION, "", CGA_RGB,
|
|
{
|
|
{
|
|
"RGB", CGA_RGB
|
|
},
|
|
{
|
|
"Composite", CGA_COMPOSITE
|
|
},
|
|
{
|
|
""
|
|
}
|
|
}
|
|
},
|
|
{
|
|
"composite_type", "Composite type", CONFIG_SELECTION, "", COMPOSITE_OLD,
|
|
{
|
|
{
|
|
"Old", COMPOSITE_OLD
|
|
},
|
|
{
|
|
"New", COMPOSITE_NEW
|
|
},
|
|
{
|
|
""
|
|
}
|
|
}
|
|
},
|
|
{
|
|
"rgb_type", "RGB type", CONFIG_SELECTION, "", 0,
|
|
{
|
|
{
|
|
"Color", 0
|
|
},
|
|
{
|
|
"Green Monochrome", 1
|
|
},
|
|
{
|
|
"Amber Monochrome", 2
|
|
},
|
|
{
|
|
"Gray Monochrome", 3
|
|
},
|
|
{
|
|
"Color (no brown)", 4
|
|
},
|
|
{
|
|
""
|
|
}
|
|
}
|
|
},
|
|
{
|
|
"snow_enabled", "Snow emulation", CONFIG_BINARY, "", 1
|
|
},
|
|
{
|
|
"", "", -1
|
|
}
|
|
};
|
|
|
|
device_t cga_device =
|
|
{
|
|
"CGA",
|
|
DEVICE_ISA, 0,
|
|
cga_standalone_init,
|
|
cga_close,
|
|
NULL,
|
|
NULL,
|
|
cga_speed_changed,
|
|
NULL,
|
|
NULL,
|
|
cga_config
|
|
};
|