9c111584b5
8514/A/Mach8/32: Reworked the acceleration a bit as well as the mode switches from VGA to ATI/8514/A mode and viceversa based on the documentation. Fixes the Linux GUI fonts using the Mach32 driver (possibly Mach8 too) and other anomalies (still needs more work on the acceleration though). PVGA: Minor fixes to the banking. S3-based (Pre-ViRGE): 1. Made the chip class use its own banking so that the Enhanced Mode mapping (equivalent to 64K-based A0000) is taken into account (per bit 3 of CRTC31, which forces the mapping to be 64K A0000, regardless of the GDCREG6 bits). Fixes NT 3.1 347.1's S3 driver. 2. Initial rework on 15bpp/16bpp accelerated mode of the 911/924 chips (currently not 100% bug free, I need help with this chips). XGA-1/2: Get rid of the linear endian reverse variable hack used by OS/2 and, instead, use the already declared ones more wisely, fixes OS/2 2.1 reversed fonts and keeps everything else working as it should. Misc: Added the BT481 RAMDAC for future card use.
161 lines
3.8 KiB
C
161 lines
3.8 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 Brooktree BT481 true colour RAMDAC
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* family.
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*
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*
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*
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* Authors: TheCollector1995.
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*
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* Copyright 2024 TheCollector1995.
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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/mem.h>
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#include <86box/timer.h>
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#include <86box/video.h>
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#include <86box/vid_svga.h>
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typedef struct bt481_ramdac_t {
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int state;
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uint8_t cmd;
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} bt481_ramdac_t;
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static void
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bt481_ramdac_command(uint8_t val, void *priv, svga_t *svga)
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{
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bt481_ramdac_t *ramdac = (bt481_ramdac_t *) priv;
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ramdac->cmd = val;
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pclog("RAMDAC CMD=%02x.\n", val);
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switch ((ramdac->cmd >> 4) & 0x0f) {
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default:
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case 0x00:
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svga->bpp = 8;
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break;
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case 0x08:
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case 0x0a:
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svga->bpp = 15;
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break;
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case 0x09:
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case 0x0c:
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svga->bpp = 16;
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break;
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case 0x0e:
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case 0x0f:
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svga->bpp = 24;
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break;
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}
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svga_recalctimings(svga);
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}
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void
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bt481_ramdac_out(uint16_t addr, int rs2, uint8_t val, void *priv, svga_t *svga)
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{
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bt481_ramdac_t *ramdac = (bt481_ramdac_t *) priv;
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uint8_t rs = (addr & 0x03) | ((!!rs2) << 2);
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switch (rs) {
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case 0x00:
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case 0x01:
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case 0x03:
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case 0x04:
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case 0x05:
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case 0x07:
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svga_out(addr, val, svga);
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ramdac->state = 0;
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break;
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case 0x02:
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pclog("RAMDAC Write State=%x.\n", ramdac->state);
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switch (ramdac->state) {
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case 4:
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bt481_ramdac_command(val, ramdac, svga);
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break;
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default:
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svga_out(addr, val, svga);
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break;
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}
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break;
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case 0x06:
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bt481_ramdac_command(val, ramdac, svga);
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ramdac->state = 0;
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break;
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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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bt481_ramdac_in(uint16_t addr, int rs2, void *priv, svga_t *svga)
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{
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bt481_ramdac_t * ramdac = (bt481_ramdac_t *) priv;
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uint8_t temp = 0xff;
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uint8_t rs = (addr & 0x03) | ((!!rs2) << 2);
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switch (rs) {
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case 0x02:
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case 0x06:
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switch (ramdac->state) {
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case 4:
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temp = ramdac->cmd;
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break;
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default:
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temp = svga_in(addr, svga);
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ramdac->state++;
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break;
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}
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break;
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default:
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temp = svga_in(addr, svga);
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ramdac->state = 0;
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break;
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}
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pclog("RAMDAC IN=%02x, ret=%02x.\n", rs, temp);
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return temp;
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}
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static void *
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bt481_ramdac_init(const device_t *info)
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{
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bt481_ramdac_t *ramdac = (bt481_ramdac_t *) malloc(sizeof(bt481_ramdac_t));
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memset(ramdac, 0, sizeof(bt481_ramdac_t));
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return ramdac;
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}
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static void
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bt481_ramdac_close(void *priv)
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{
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bt481_ramdac_t *ramdac = (bt481_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 bt481_ramdac_device = {
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.name = "Brooktree Bt481 RAMDAC",
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.internal_name = "bt481_ramdac",
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.flags = 0,
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.local = 0,
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.init = bt481_ramdac_init,
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.close = bt481_ramdac_close,
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.reset = NULL,
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{ .available = NULL },
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.speed_changed = NULL,
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.force_redraw = NULL,
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.config = NULL
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};
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