a505894a10
- 86Box's own headers go to /86box - munt's public interface goes to /mt32emu - all slirp headers go to /slirp (might want to consider using only its public inteface) - single file headers from other projects go in include root
128 lines
2.3 KiB
C
128 lines
2.3 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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* Trident TKD8001 RAMDAC emulation.
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*
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*
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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 <stdlib.h>
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#include <string.h>
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#include <wchar.h>
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#include <86box/86box.h>
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#include <86box/device.h>
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#include <86box/timer.h>
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#include <86box/mem.h>
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#include <86box/video.h>
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#include <86box/vid_svga.h>
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typedef struct tkd8001_ramdac_t
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{
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int state;
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uint8_t ctrl;
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} tkd8001_ramdac_t;
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void
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tkd8001_ramdac_out(uint16_t addr, uint8_t val, void *p, svga_t *svga)
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{
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tkd8001_ramdac_t *ramdac = (tkd8001_ramdac_t *) p;
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switch (addr) {
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case 0x3C6:
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if (ramdac->state == 4) {
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ramdac->state = 0;
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ramdac->ctrl = val;
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switch (val >> 5) {
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case 0:
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case 1:
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case 2:
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case 3:
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svga->bpp = 8;
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break;
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case 5:
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svga->bpp = 15;
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break;
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case 6:
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svga->bpp = 24;
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break;
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case 7:
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svga->bpp = 16;
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break;
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}
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return;
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}
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break;
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case 0x3C7:
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case 0x3C8:
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case 0x3C9:
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ramdac->state = 0;
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break;
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}
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svga_out(addr, val, svga);
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}
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uint8_t
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tkd8001_ramdac_in(uint16_t addr, void *p, svga_t *svga)
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{
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tkd8001_ramdac_t *ramdac = (tkd8001_ramdac_t *) p;
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switch (addr) {
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case 0x3C6:
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if (ramdac->state == 4)
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return ramdac->ctrl;
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ramdac->state++;
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break;
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case 0x3C7:
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case 0x3C8:
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case 0x3C9:
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ramdac->state = 0;
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break;
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}
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return svga_in(addr, svga);
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}
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static void *
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tkd8001_ramdac_init(const device_t *info)
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{
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tkd8001_ramdac_t *ramdac = (tkd8001_ramdac_t *) malloc(sizeof(tkd8001_ramdac_t));
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memset(ramdac, 0, sizeof(tkd8001_ramdac_t));
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return ramdac;
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}
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static void
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tkd8001_ramdac_close(void *priv)
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{
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tkd8001_ramdac_t *ramdac = (tkd8001_ramdac_t *) priv;
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if (ramdac)
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free(ramdac);
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}
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const device_t tkd8001_ramdac_device =
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{
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"Trident TKD8001 RAMDAC",
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0, 0,
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tkd8001_ramdac_init, tkd8001_ramdac_close,
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NULL, NULL, NULL, NULL
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};
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