7c67e867c8
IBM.H is gone, video stuff re-organized. Keyboard stuff reorganized. Machines that have their own video, mouse and/or keyboard now have all this in their machine file. Fixed and other cleanups here and there.
112 lines
3.4 KiB
C
112 lines
3.4 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 a Sierra SC1502X RAMDAC.
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*
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* Used by the TLIVESA1 driver for ET4000.
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*
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* Version: @(#)vid_sc1502x_ramdac.c 1.0.2 2017/11/04
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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 2008-2017 Sarah Walker.
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* Copyright 2016,2017 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 <wchar.h>
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#include "../86box.h"
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#include "../mem.h"
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#include "video.h"
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#include "vid_svga.h"
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#include "vid_sc1502x_ramdac.h"
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void sc1502x_ramdac_out(uint16_t addr, uint8_t val, sc1502x_ramdac_t *ramdac, svga_t *svga)
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{
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int oldbpp = 0;
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switch (addr)
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{
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case 0x3C6:
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if (ramdac->state == 4)
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{
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ramdac->state = 0;
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if (val == 0xFF) break;
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ramdac->ctrl = val;
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oldbpp = svga->bpp;
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switch ((val&1)|((val&0xC0)>>5))
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{
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case 0:
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svga->bpp = 8;
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break;
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case 2: case 3:
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switch (val & 0x20)
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{
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case 0x00: svga->bpp = 32; break;
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case 0x20: svga->bpp = 24; break;
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}
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break;
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case 4: 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 = 16;
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break;
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case 7:
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switch (val & 4)
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{
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case 4:
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switch (val & 0x20)
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{
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case 0x00: svga->bpp = 32; break;
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case 0x20: svga->bpp = 24; break;
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}
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break;
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case 0: default:
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svga->bpp = 16;
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break;
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}
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case 1: default:
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break;
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}
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if (oldbpp != svga->bpp)
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{
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svga_recalctimings(svga);
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}
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return;
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}
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ramdac->state = 0;
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break;
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case 0x3C7: case 0x3C8: 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 sc1502x_ramdac_in(uint16_t addr, sc1502x_ramdac_t *ramdac, svga_t *svga)
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{
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switch (addr)
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{
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case 0x3C6:
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if (ramdac->state == 4)
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{
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ramdac->state = 0;
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return ramdac->ctrl;
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}
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ramdac->state++;
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break;
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case 0x3C7: case 0x3C8: 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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