914 lines
27 KiB
C
914 lines
27 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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*
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*
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* Authors: Sarah Walker, <https://pcem-emulator.co.uk/>
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* Miran Grca, <mgrca8@gmail.com>
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* W. M. Martinez, <anikom15@outlook.com>
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*
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* Copyright 2008-2019 Sarah Walker.
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* Copyright 2016-2019 Miran Grca.
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* Copyright 2023 W. M. Martinez
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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/86box.h>
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#include "cpu.h"
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#include <86box/io.h>
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#include <86box/timer.h>
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#include <86box/pit.h>
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#include <86box/mem.h>
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#include <86box/rom.h>
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#include <86box/device.h>
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#include <86box/video.h>
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#include <86box/vid_cga.h>
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#include <86box/vid_cga_comp.h>
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#include <86box/plat_unused.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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#define DOUBLE_NONE 0
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#define DOUBLE_SIMPLE 1
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#define DOUBLE_INTERPOLATE_SRGB 2
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#define DOUBLE_INTERPOLATE_LINEAR 3
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typedef union
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{
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uint32_t color;
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struct {
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uint8_t b;
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uint8_t g;
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uint8_t r;
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uint8_t a;
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};
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} color_t;
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static uint8_t crtcmask[32] = {
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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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static uint8_t interp_lut[2][256][256];
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static video_timings_t timing_cga = { .type = VIDEO_ISA, .write_b = 8, .write_w = 16, .write_l = 32, .read_b = 8, .read_w = 16, .read_l = 32 };
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void cga_recalctimings(cga_t *cga);
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void
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cga_out(uint16_t addr, uint8_t val, void *priv)
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{
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cga_t *cga = (cga_t *) priv;
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uint8_t old;
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if ((addr >= 0x3d0) && (addr <= 0x3d7))
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addr = (addr & 0xff9) | 0x004;
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switch (addr) {
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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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if ((cga->crtcreg < 0xe) || (cga->crtcreg > 0x10)) {
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cga->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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old = cga->cgamode;
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cga->cgamode = val;
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if (old ^ val) {
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if ((old ^ val) & 0x07)
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update_cga16_color(val);
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cga_recalctimings(cga);
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}
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return;
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case 0x3D9:
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old = cga->cgacol;
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cga->cgacol = val;
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if (old ^ val)
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cga_recalctimings(cga);
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return;
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default:
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break;
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}
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}
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uint8_t
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cga_in(uint16_t addr, void *priv)
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{
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const cga_t *cga = (cga_t *) priv;
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uint8_t ret = 0xff;
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if ((addr >= 0x3d0) && (addr <= 0x3d7))
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addr = (addr & 0xff9) | 0x004;
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switch (addr) {
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case 0x3D4:
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ret = cga->crtcreg;
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break;
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case 0x3D5:
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ret = cga->crtc[cga->crtcreg];
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break;
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case 0x3DA:
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ret = cga->cgastat;
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break;
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default:
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break;
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}
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return ret;
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}
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void
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cga_pravetz_out(UNUSED(uint16_t addr), uint8_t val, void *priv)
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{
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cga_t *cga = (cga_t *) priv;
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cga->fontbase = (((unsigned int) val) << 8);
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}
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uint8_t
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cga_pravetz_in(UNUSED(uint16_t addr), void *priv)
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{
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const cga_t *cga = (cga_t *) priv;
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return (cga->fontbase >> 8);
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}
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void
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cga_waitstates(UNUSED(void *priv))
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{
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int ws_array[16] = { 3, 4, 5, 6, 7, 8, 4, 5, 6, 7, 8, 4, 5, 6, 7, 8 };
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int ws;
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ws = ws_array[cycles & 0xf];
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cycles -= ws;
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}
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void
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cga_write(uint32_t addr, uint8_t val, void *priv)
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{
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cga_t *cga = (cga_t *) priv;
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cga->vram[addr & 0x3fff] = val;
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if (cga->snow_enabled) {
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int offset = ((timer_get_remaining_u64(&cga->timer) / CGACONST) * 2) & 0xfc;
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cga->charbuffer[offset] = cga->vram[addr & 0x3fff];
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cga->charbuffer[offset | 1] = cga->vram[addr & 0x3fff];
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}
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cga_waitstates(cga);
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}
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uint8_t
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cga_read(uint32_t addr, void *priv)
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{
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cga_t *cga = (cga_t *) priv;
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cga_waitstates(cga);
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if (cga->snow_enabled) {
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int offset = ((timer_get_remaining_u64(&cga->timer) / CGACONST) * 2) & 0xfc;
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cga->charbuffer[offset] = cga->vram[addr & 0x3fff];
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cga->charbuffer[offset | 1] = cga->vram[addr & 0x3fff];
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}
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return cga->vram[addr & 0x3fff];
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}
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void
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cga_recalctimings(cga_t *cga)
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{
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double disptime;
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double _dispontime;
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double _dispofftime;
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if (cga->cgamode & 1) {
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disptime = (double) (cga->crtc[0] + 1);
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_dispontime = (double) cga->crtc[1];
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} else {
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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 = (uint64_t) (_dispontime);
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cga->dispofftime = (uint64_t) (_dispofftime);
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}
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static void
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cga_render(cga_t *cga, int line)
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{
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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;
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int c;
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uint8_t chr;
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uint8_t 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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if ((cga->cgamode & 0x12) == 0x12) {
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for (c = 0; c < 8; ++c) {
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buffer32->line[line][c] = 0;
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if (cga->cgamode & 1)
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buffer32->line[line][c + (cga->crtc[1] << 3) + 8] = 0;
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else
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buffer32->line[line][c + (cga->crtc[1] << 4) + 8] = 0;
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}
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} else {
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for (c = 0; c < 8; ++c) {
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buffer32->line[line][c] = (cga->cgacol & 15) + 16;
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if (cga->cgamode & 1)
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buffer32->line[line][c + (cga->crtc[1] << 3) + 8] = (cga->cgacol & 15) + 16;
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else
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buffer32->line[line][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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for (x = 0; x < cga->crtc[1]; x++) {
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if (cga->cgamode & 8) {
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chr = cga->charbuffer[x << 1];
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attr = cga->charbuffer[(x << 1) + 1];
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} else
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chr = attr = 0;
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drawcursor = ((cga->ma == ca) && cga->con && cga->cursoron);
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cols[1] = (attr & 15) + 16;
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if (cga->cgamode & 0x20) {
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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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} else
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cols[0] = (attr >> 4) + 16;
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if (drawcursor) {
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for (c = 0; c < 8; c++) {
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buffer32->line[line][(x << 3) + c + 8]
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= 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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for (c = 0; c < 8; c++) {
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buffer32->line[line][(x << 3) + c + 8]
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= 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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cga->ma++;
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}
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} else if (!(cga->cgamode & 2)) {
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for (x = 0; x < cga->crtc[1]; x++) {
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if (cga->cgamode & 8) {
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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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} else
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chr = attr = 0;
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drawcursor = ((cga->ma == ca) && cga->con && cga->cursoron);
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cols[1] = (attr & 15) + 16;
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if (cga->cgamode & 0x20) {
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cols[0] = ((attr >> 4) & 7) + 16;
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if ((cga->cgablink & 8) && (attr & 0x80))
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cols[1] = cols[0];
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} else
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cols[0] = (attr >> 4) + 16;
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cga->ma++;
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if (drawcursor) {
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for (c = 0; c < 8; c++) {
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buffer32->line[line][(x << 4) + (c << 1) + 8]
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= buffer32->line[line][(x << 4) + (c << 1) + 9]
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= 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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for (c = 0; c < 8; c++) {
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buffer32->line[line][(x << 4) + (c << 1) + 8]
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= buffer32->line[line][(x << 4) + (c << 1) + 9]
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= 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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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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cols[1] = col | 3; /* Cyan */
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cols[2] = col | 4; /* Red */
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cols[3] = col | 7; /* White */
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} else if (cga->cgacol & 32) {
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cols[1] = col | 3; /* Cyan */
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cols[2] = col | 5; /* Magenta */
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cols[3] = col | 7; /* White */
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} else {
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cols[1] = col | 2; /* Green */
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cols[2] = col | 4; /* Red */
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cols[3] = col | 6; /* Yellow */
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}
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for (x = 0; x < cga->crtc[1]; x++) {
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if (cga->cgamode & 8)
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dat = (cga->vram[((cga->ma << 1) & 0x1fff) + ((cga->sc & 1) * 0x2000)] << 8) |
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cga->vram[((cga->ma << 1) & 0x1fff) + ((cga->sc & 1) * 0x2000) + 1];
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else
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dat = 0;
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cga->ma++;
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for (c = 0; c < 8; c++) {
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buffer32->line[line][(x << 4) + (c << 1) + 8]
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= buffer32->line[line][(x << 4) + (c << 1) + 9]
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= cols[dat >> 14];
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dat <<= 2;
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}
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}
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} else {
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cols[0] = 0;
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cols[1] = (cga->cgacol & 15) + 16;
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for (x = 0; x < cga->crtc[1]; x++) {
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if (cga->cgamode & 8)
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dat = (cga->vram[((cga->ma << 1) & 0x1fff) + ((cga->sc & 1) * 0x2000)] << 8) |
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cga->vram[((cga->ma << 1) & 0x1fff) + ((cga->sc & 1) * 0x2000) + 1];
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else
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dat = 0;
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cga->ma++;
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for (c = 0; c < 16; c++) {
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buffer32->line[line][(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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static void
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cga_render_blank(cga_t *cga, int line)
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{
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int col = ((cga->cgamode & 0x12) == 0x12) ? 0 : (cga->cgacol & 15) + 16;
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if (cga->cgamode & 1)
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hline(buffer32, 0, line, (cga->crtc[1] << 3) + 16, col);
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else
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hline(buffer32, 0, line, (cga->crtc[1] << 4) + 16, col);
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}
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static void
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cga_render_process(cga_t *cga, int line)
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{
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int x;
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uint8_t border;
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if (cga->cgamode & 1)
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x = (cga->crtc[1] << 3) + 16;
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else
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x = (cga->crtc[1] << 4) + 16;
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if (cga->composite) {
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border = ((cga->cgamode & 0x12) == 0x12) ? 0 : (cga->cgacol & 15);
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Composite_Process(cga->cgamode, border, x >> 2, buffer32->line[line]);
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} else
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video_process_8(x, line);
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}
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static uint8_t
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cga_interpolate_srgb(uint8_t co1, uint8_t co2, double fraction)
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{
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uint8_t ret = ((co2 - co1) * fraction + co1);
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return ret;
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}
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static uint8_t
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cga_interpolate_linear(uint8_t co1, uint8_t co2, double fraction)
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{
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double c1, c2;
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double r1, r2;
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uint8_t ret;
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c1 = ((double) co1) / 255.0;
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c1 = pow((co1 >= 0) ? c1 : -c1, 2.19921875);
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if (co1 <= 0)
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c1 = -c1;
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c2 = ((double) co2) / 255.0;
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c2 = pow((co2 >= 0) ? c2 : -c2, 2.19921875);
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if (co2 <= 0)
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c2 = -c2;
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r1 = ((c2 - c1) * fraction + c1);
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r2 = pow((r1 >= 0.0) ? r1 : -r1, 1.0 / 2.19921875);
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if (r1 <= 0.0)
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r2 = -r2;
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ret = (uint8_t) (r2 * 255.0);
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return ret;
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}
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static color_t
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cga_interpolate_lookup(cga_t *cga, color_t color1, color_t color2, double fraction)
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{
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color_t ret;
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uint8_t dt = cga->double_type - DOUBLE_INTERPOLATE_SRGB;
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ret.a = 0x00;
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ret.r = interp_lut[dt][color1.r][color2.r];
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ret.g = interp_lut[dt][color1.g][color2.g];
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ret.b = interp_lut[dt][color1.b][color2.b];
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return ret;
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}
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static void
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cga_interpolate(cga_t *cga, int x, int y, int w, int h)
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{
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double quotient = 0.5;
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for (int i = y; i < (y + h); i++) {
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if (i & 1) for (int j = x; j < (x + w); j++) {
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int prev = i - 1;
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int next = i + 1;
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color_t prev_color, next_color;
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color_t black;
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color_t interim_1, interim_2;
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color_t final;
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black.color = 0x00000000;
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prev_color.color = buffer32->line[prev][j];
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if (next < (y + h))
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next_color.color = buffer32->line[next][j];
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else
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next_color.color = 0x00000000;
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interim_1 = cga_interpolate_lookup(cga, prev_color, black, quotient);
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interim_2 = cga_interpolate_lookup(cga, black, next_color, quotient);
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final = cga_interpolate_lookup(cga, interim_1, interim_2, quotient);
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buffer32->line[i][j] = final.color;
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}
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|
}
|
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}
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|
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static void
|
|
cga_blit_memtoscreen(cga_t *cga, int x, int y, int w, int h)
|
|
{
|
|
if (cga->double_type > DOUBLE_SIMPLE)
|
|
cga_interpolate(cga, x, y, w, h);
|
|
|
|
video_blit_memtoscreen(x, y, w, h);
|
|
}
|
|
|
|
void
|
|
cga_poll(void *priv)
|
|
{
|
|
cga_t *cga = (cga_t *) priv;
|
|
int x;
|
|
int oldsc;
|
|
int oldvc;
|
|
int xs_temp;
|
|
int ys_temp;
|
|
int old_ma;
|
|
|
|
if (!cga->linepos) {
|
|
timer_advance_u64(&cga->timer, cga->dispofftime);
|
|
cga->cgastat |= 1;
|
|
cga->linepos = 1;
|
|
oldsc = cga->sc;
|
|
if ((cga->crtc[8] & 3) == 3)
|
|
cga->sc = ((cga->sc << 1) + cga->oddeven) & 7;
|
|
if (cga->cgadispon) {
|
|
if (cga->displine < cga->firstline) {
|
|
cga->firstline = cga->displine;
|
|
video_wait_for_buffer();
|
|
}
|
|
cga->lastline = cga->displine;
|
|
switch (cga->double_type) {
|
|
default:
|
|
cga_render(cga, cga->displine << 1);
|
|
cga_render_blank(cga, (cga->displine << 1) + 1);
|
|
break;
|
|
case DOUBLE_NONE:
|
|
cga_render(cga, cga->displine);
|
|
break;
|
|
case DOUBLE_SIMPLE:
|
|
old_ma = cga->ma;
|
|
cga_render(cga, cga->displine << 1);
|
|
cga->ma = old_ma;
|
|
cga_render(cga, (cga->displine << 1) + 1);
|
|
break;
|
|
}
|
|
} else {
|
|
switch (cga->double_type) {
|
|
default:
|
|
cga_render_blank(cga, cga->displine << 1);
|
|
break;
|
|
case DOUBLE_NONE:
|
|
cga_render_blank(cga, cga->displine);
|
|
break;
|
|
case DOUBLE_SIMPLE:
|
|
cga_render_blank(cga, cga->displine << 1);
|
|
cga_render_blank(cga, (cga->displine << 1) + 1);
|
|
break;
|
|
}
|
|
}
|
|
|
|
switch (cga->double_type) {
|
|
default:
|
|
cga_render_process(cga, cga->displine << 1);
|
|
cga_render_process(cga, (cga->displine << 1) + 1);
|
|
break;
|
|
case DOUBLE_NONE:
|
|
cga_render_process(cga, cga->displine);
|
|
break;
|
|
}
|
|
|
|
cga->sc = oldsc;
|
|
if (cga->vc == cga->crtc[7] && !cga->sc)
|
|
cga->cgastat |= 8;
|
|
cga->displine++;
|
|
if (cga->displine >= 360)
|
|
cga->displine = 0;
|
|
} else {
|
|
timer_advance_u64(&cga->timer, cga->dispontime);
|
|
cga->linepos = 0;
|
|
if (cga->vsynctime) {
|
|
cga->vsynctime--;
|
|
if (!cga->vsynctime)
|
|
cga->cgastat &= ~8;
|
|
}
|
|
if (cga->sc == (cga->crtc[11] & 31) || ((cga->crtc[8] & 3) == 3 &&
|
|
cga->sc == ((cga->crtc[11] & 31) >> 1))) {
|
|
cga->con = 0;
|
|
cga->coff = 1;
|
|
}
|
|
if ((cga->crtc[8] & 3) == 3 && cga->sc == (cga->crtc[9] >> 1))
|
|
cga->maback = cga->ma;
|
|
if (cga->vadj) {
|
|
cga->sc++;
|
|
cga->sc &= 31;
|
|
cga->ma = cga->maback;
|
|
cga->vadj--;
|
|
if (!cga->vadj) {
|
|
cga->cgadispon = 1;
|
|
cga->ma = cga->maback = (cga->crtc[13] | (cga->crtc[12] << 8)) & 0x3fff;
|
|
cga->sc = 0;
|
|
}
|
|
} else if (cga->sc == cga->crtc[9]) {
|
|
cga->maback = cga->ma;
|
|
cga->sc = 0;
|
|
oldvc = cga->vc;
|
|
cga->vc++;
|
|
cga->vc &= 127;
|
|
|
|
if (cga->vc == cga->crtc[6])
|
|
cga->cgadispon = 0;
|
|
|
|
if (oldvc == cga->crtc[4]) {
|
|
cga->vc = 0;
|
|
cga->vadj = cga->crtc[5];
|
|
if (!cga->vadj) {
|
|
cga->cgadispon = 1;
|
|
cga->ma = cga->maback = (cga->crtc[13] | (cga->crtc[12] << 8)) & 0x3fff;
|
|
}
|
|
switch (cga->crtc[10] & 0x60) {
|
|
case 0x20:
|
|
cga->cursoron = 0;
|
|
break;
|
|
case 0x60:
|
|
cga->cursoron = cga->cgablink & 0x10;
|
|
break;
|
|
default:
|
|
cga->cursoron = cga->cgablink & 0x08;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (cga->vc == cga->crtc[7]) {
|
|
cga->cgadispon = 0;
|
|
cga->displine = 0;
|
|
cga->vsynctime = 16;
|
|
if (cga->crtc[7]) {
|
|
if (cga->cgamode & 1)
|
|
x = (cga->crtc[1] << 3) + 16;
|
|
else
|
|
x = (cga->crtc[1] << 4) + 16;
|
|
cga->lastline++;
|
|
|
|
xs_temp = x;
|
|
ys_temp = cga->lastline - cga->firstline;
|
|
if (cga->double_type > DOUBLE_NONE)
|
|
ys_temp <<= 1;
|
|
|
|
if ((xs_temp > 0) && (ys_temp > 0)) {
|
|
if (xs_temp < 64)
|
|
xs_temp = 656;
|
|
if (ys_temp < 32)
|
|
ys_temp = 200;
|
|
if (!enable_overscan)
|
|
xs_temp -= 16;
|
|
|
|
if ((cga->cgamode & 8) && ((xs_temp != xsize) ||
|
|
(ys_temp != ysize) || video_force_resize_get())) {
|
|
xsize = xs_temp;
|
|
ysize = ys_temp;
|
|
if (cga->double_type > DOUBLE_NONE)
|
|
set_screen_size(xsize, ysize + (enable_overscan ? 16 : 0));
|
|
else
|
|
set_screen_size(xsize, ysize + (enable_overscan ? 8 : 0));
|
|
|
|
if (video_force_resize_get())
|
|
video_force_resize_set(0);
|
|
}
|
|
|
|
if (cga->double_type > DOUBLE_NONE) {
|
|
if (enable_overscan)
|
|
cga_blit_memtoscreen(cga, 0, (cga->firstline - 4) << 1,
|
|
xsize, ((cga->lastline - cga->firstline) << 1) + 16);
|
|
else
|
|
cga_blit_memtoscreen(cga, 8, cga->firstline << 1,
|
|
xsize, (cga->lastline - cga->firstline) << 1);
|
|
} else {
|
|
if (enable_overscan)
|
|
video_blit_memtoscreen(0, cga->firstline - 4,
|
|
xsize, (cga->lastline - cga->firstline) + 8);
|
|
else
|
|
video_blit_memtoscreen(8, cga->firstline,
|
|
xsize, cga->lastline - cga->firstline);
|
|
}
|
|
}
|
|
|
|
frames++;
|
|
|
|
video_res_x = xsize;
|
|
video_res_y = ysize;
|
|
if (cga->cgamode & 1) {
|
|
video_res_x /= 8;
|
|
video_res_y /= cga->crtc[9] + 1;
|
|
video_bpp = 0;
|
|
} else if (!(cga->cgamode & 2)) {
|
|
video_res_x /= 16;
|
|
video_res_y /= cga->crtc[9] + 1;
|
|
video_bpp = 0;
|
|
} else if (!(cga->cgamode & 16)) {
|
|
video_res_x /= 2;
|
|
video_bpp = 2;
|
|
} else
|
|
video_bpp = 1;
|
|
}
|
|
cga->firstline = 1000;
|
|
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)
|
|
{
|
|
timer_add(&cga->timer, cga_poll, cga, 1);
|
|
cga->composite = 0;
|
|
}
|
|
|
|
void *
|
|
cga_standalone_init(UNUSED(const device_t *info))
|
|
{
|
|
int display_type;
|
|
cga_t *cga = malloc(sizeof(cga_t));
|
|
|
|
memset(cga, 0, sizeof(cga_t));
|
|
video_inform(VIDEO_FLAG_TYPE_CGA, &timing_cga);
|
|
|
|
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->timer, cga_poll, cga, 1);
|
|
mem_mapping_add(&cga->mapping, 0xb8000, 0x08000, cga_read, NULL, NULL, cga_write, NULL, NULL, NULL /*cga->vram*/, 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();
|
|
update_cga16_color(cga->cgamode);
|
|
|
|
cga->double_type = device_get_config_int("double_type");
|
|
|
|
for (uint16_t i = 0; i < 256; i++) {
|
|
for (uint16_t j = 0; j < 256; j++) {
|
|
interp_lut[0][i][j] = cga_interpolate_srgb(i, j, 0.5);
|
|
interp_lut[1][i][j] = cga_interpolate_linear(i, j, 0.5);
|
|
}
|
|
}
|
|
|
|
return cga;
|
|
}
|
|
|
|
void *
|
|
cga_pravetz_init(const device_t *info)
|
|
{
|
|
cga_t *cga = cga_standalone_init(info);
|
|
|
|
loadfont("roms/video/cga/PRAVETZ-VDC2.BIN", 10);
|
|
|
|
io_removehandler(0x03dd, 0x0001, cga_in, NULL, NULL, cga_out, NULL, NULL, cga);
|
|
io_sethandler(0x03dd, 0x0001, cga_pravetz_in, NULL, NULL, cga_pravetz_out, NULL, NULL, cga);
|
|
|
|
cga->fontbase = 0x0300;
|
|
|
|
return cga;
|
|
}
|
|
|
|
void
|
|
cga_close(void *priv)
|
|
{
|
|
cga_t *cga = (cga_t *) priv;
|
|
|
|
free(cga->vram);
|
|
free(cga);
|
|
}
|
|
|
|
void
|
|
cga_speed_changed(void *priv)
|
|
{
|
|
cga_t *cga = (cga_t *) priv;
|
|
|
|
cga_recalctimings(cga);
|
|
}
|
|
|
|
// clang-format off
|
|
const device_config_t cga_config[] = {
|
|
{
|
|
.name = "display_type",
|
|
.description = "Display type",
|
|
.type = CONFIG_SELECTION,
|
|
.default_int = CGA_RGB,
|
|
.selection = {
|
|
{
|
|
.description = "RGB",
|
|
.value = CGA_RGB
|
|
},
|
|
{
|
|
.description = "Composite",
|
|
.value = CGA_COMPOSITE
|
|
},
|
|
{
|
|
.description = ""
|
|
}
|
|
}
|
|
},
|
|
{
|
|
.name = "composite_type",
|
|
.description = "Composite type",
|
|
.type = CONFIG_SELECTION,
|
|
.default_int = COMPOSITE_OLD,
|
|
.selection = {
|
|
{
|
|
.description = "Old",
|
|
.value = COMPOSITE_OLD
|
|
},
|
|
{
|
|
.description = "New",
|
|
.value = COMPOSITE_NEW
|
|
},
|
|
{
|
|
.description = ""
|
|
}
|
|
}
|
|
},
|
|
{
|
|
.name = "rgb_type",
|
|
.description = "RGB type",
|
|
.type = CONFIG_SELECTION,
|
|
.default_int = 5,
|
|
.selection = {
|
|
{
|
|
.description = "Color (generic)",
|
|
.value = 0
|
|
},
|
|
{
|
|
.description = "Green Monochrome",
|
|
.value = 1
|
|
},
|
|
{
|
|
.description = "Amber Monochrome",
|
|
.value = 2
|
|
},
|
|
{
|
|
.description = "Gray Monochrome",
|
|
.value = 3
|
|
},
|
|
{
|
|
.description = "Color (no brown)",
|
|
.value = 4
|
|
},
|
|
{
|
|
.description = "Color (IBM 5153)",
|
|
.value = 5
|
|
},
|
|
{
|
|
.description = ""
|
|
}
|
|
}
|
|
},
|
|
{
|
|
.name = "double_type",
|
|
.description = "Line doubling type",
|
|
.type = CONFIG_SELECTION,
|
|
.default_int = DOUBLE_NONE,
|
|
.selection = {
|
|
{
|
|
.description = "None",
|
|
.value = DOUBLE_NONE
|
|
},
|
|
{
|
|
.description = "Simple doubling",
|
|
.value = DOUBLE_SIMPLE
|
|
},
|
|
{
|
|
.description = "sRGB interpolation",
|
|
.value = DOUBLE_INTERPOLATE_SRGB
|
|
},
|
|
{
|
|
.description = "Linear interpolation",
|
|
.value = DOUBLE_INTERPOLATE_LINEAR
|
|
},
|
|
{
|
|
.description = ""
|
|
}
|
|
}
|
|
},
|
|
{
|
|
.name = "snow_enabled",
|
|
.description = "Snow emulation",
|
|
.type = CONFIG_BINARY,
|
|
.default_int = 1
|
|
},
|
|
{
|
|
.type = CONFIG_END
|
|
}
|
|
};
|
|
// clang-format on
|
|
|
|
const device_t cga_device = {
|
|
.name = "CGA",
|
|
.internal_name = "cga",
|
|
.flags = DEVICE_ISA,
|
|
.local = 0,
|
|
.init = cga_standalone_init,
|
|
.close = cga_close,
|
|
.reset = NULL,
|
|
{ .available = NULL },
|
|
.speed_changed = cga_speed_changed,
|
|
.force_redraw = NULL,
|
|
.config = cga_config
|
|
};
|
|
|
|
const device_t cga_pravetz_device = {
|
|
.name = "Pravetz VDC-2",
|
|
.internal_name = "cga_pravetz",
|
|
.flags = DEVICE_ISA,
|
|
.local = 0,
|
|
.init = cga_pravetz_init,
|
|
.close = cga_close,
|
|
.reset = NULL,
|
|
{ .available = NULL },
|
|
.speed_changed = cga_speed_changed,
|
|
.force_redraw = NULL,
|
|
.config = cga_config
|
|
};
|