1354 lines
32 KiB
C
1354 lines
32 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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* Generic SVGA handling.
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*
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* This is intended to be used by another SVGA driver,
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* and not as a card in it's own right.
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*
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* Version: @(#)vid_svga.c 1.0.29 2018/04/26
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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 <inttypes.h>
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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 "../86box.h"
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#include "../cpu/cpu.h"
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#include "../machine/machine.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 "video.h"
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#include "vid_svga.h"
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#include "vid_svga_render.h"
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#define svga_output 0
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void svga_doblit(int y1, int y2, int wx, int wy, svga_t *svga);
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extern int cyc_total;
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extern uint8_t edatlookup[4][4];
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uint8_t svga_rotate[8][256];
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static const uint32_t mask16[16] = {
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0x00000000, 0x000000ff, 0x0000ff00, 0x0000ffff,
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0x00ff0000, 0x00ff00ff, 0x00ffff00, 0x00ffffff,
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0xff000000, 0xff0000ff, 0xff00ff00, 0xff00ffff,
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0xffff0000, 0xffff00ff, 0xffffff00, 0xffffffff
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};
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/*Primary SVGA device. As multiple video cards are not yet supported this is the
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only SVGA device.*/
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static svga_t *svga_pri;
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svga_t
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*svga_get_pri()
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{
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return svga_pri;
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}
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void
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svga_set_override(svga_t *svga, int val)
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{
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if (svga->override && !val)
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svga->fullchange = changeframecount;
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svga->override = val;
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}
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/* Used to add custom write modes, eg. by the CL-GD 54xx to add write modes 4 and 5. */
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void
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svga_set_ven_write(svga_t *svga, void (*ven_write)(struct svga_t *svga, uint8_t val, uint32_t addr))
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{
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svga->ven_write = ven_write;
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}
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void
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svga_out(uint16_t addr, uint8_t val, void *p)
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{
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svga_t *svga = (svga_t *)p;
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int c;
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uint8_t o;
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switch (addr) {
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case 0x3c0:
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case 0x3c1:
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if (!svga->attrff) {
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svga->attraddr = val & 31;
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if ((val & 0x20) != svga->attr_palette_enable) {
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svga->fullchange = 3;
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svga->attr_palette_enable = val & 0x20;
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svga_recalctimings(svga);
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}
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} else {
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o = svga->attrregs[svga->attraddr & 31];
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svga->attrregs[svga->attraddr & 31] = val;
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if (svga->attraddr < 16)
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svga->fullchange = changeframecount;
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if (svga->attraddr == 0x10 || svga->attraddr == 0x14 || svga->attraddr < 0x10) {
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for (c = 0; c < 16; c++) {
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if (svga->attrregs[0x10] & 0x80) {
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svga->egapal[c] = (svga->attrregs[c] & 0xf) |
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((svga->attrregs[0x14] & 0xf) << 4);
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} else {
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svga->egapal[c] = (svga->attrregs[c] & 0x3f) |
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((svga->attrregs[0x14] & 0xc) << 4);
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}
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}
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}
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/* Recalculate timings on change of attribute register 0x11
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(overscan border color) too. */
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if (svga->attraddr == 0x10) {
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if (o != val)
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svga_recalctimings(svga);
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} else if (svga->attraddr == 0x11) {
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svga->overscan_color = svga->pallook[svga->attrregs[0x11]];
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if (o != val)
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svga_recalctimings(svga);
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} else if (svga->attraddr == 0x12) {
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if ((val & 0xf) != svga->plane_mask)
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svga->fullchange = changeframecount;
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svga->plane_mask = val & 0xf;
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}
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}
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svga->attrff ^= 1;
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break;
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case 0x3c2:
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svga->miscout = val;
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svga->vidclock = val & 4;
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io_removehandler(0x03a0, 0x0020, svga->video_in, NULL, NULL, svga->video_out, NULL, NULL, svga->p);
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if (!(val & 1))
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io_sethandler(0x03a0, 0x0020, svga->video_in, NULL, NULL, svga->video_out, NULL, NULL, svga->p);
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svga_recalctimings(svga);
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break;
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case 0x3c4:
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svga->seqaddr = val;
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break;
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case 0x3c5:
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if (svga->seqaddr > 0xf)
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return;
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o = svga->seqregs[svga->seqaddr & 0xf];
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svga->seqregs[svga->seqaddr & 0xf] = val;
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if (o != val && (svga->seqaddr & 0xf) == 1)
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svga_recalctimings(svga);
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switch (svga->seqaddr & 0xf) {
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case 1:
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if (svga->scrblank && !(val & 0x20))
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svga->fullchange = 3;
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svga->scrblank = (svga->scrblank & ~0x20) | (val & 0x20);
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svga_recalctimings(svga);
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break;
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case 2:
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svga->writemask = val & 0xf;
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break;
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case 3:
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svga->charsetb = (((val >> 2) & 3) * 0x10000) + 2;
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svga->charseta = ((val & 3) * 0x10000) + 2;
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if (val & 0x10)
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svga->charseta += 0x8000;
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if (val & 0x20)
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svga->charsetb += 0x8000;
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break;
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case 4:
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svga->chain2_write = !(val & 4);
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svga->chain4 = val & 8;
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svga->fast = (svga->gdcreg[8] == 0xff && !(svga->gdcreg[3] & 0x18) &&
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!svga->gdcreg[1]) && svga->chain4;
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break;
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}
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break;
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case 0x3c6:
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svga->dac_mask = val;
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break;
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case 0x3C7:
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svga->dac_read = val;
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svga->dac_pos = 0;
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break;
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case 0x3c8:
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svga->dac_write = val;
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svga->dac_read = val - 1;
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svga->dac_pos = 0;
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break;
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case 0x3c9:
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svga->dac_status = 0;
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svga->fullchange = changeframecount;
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switch (svga->dac_pos) {
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case 0:
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svga->dac_r = val;
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svga->dac_pos++;
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break;
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case 1:
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svga->dac_g = val;
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svga->dac_pos++;
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break;
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case 2:
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svga->vgapal[svga->dac_write].r = svga->dac_r;
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svga->vgapal[svga->dac_write].g = svga->dac_g;
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svga->vgapal[svga->dac_write].b = val;
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if (svga->ramdac_type == RAMDAC_8BIT)
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svga->pallook[svga->dac_write] = makecol32(svga->vgapal[svga->dac_write].r, svga->vgapal[svga->dac_write].g, svga->vgapal[svga->dac_write].b);
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else
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svga->pallook[svga->dac_write] = makecol32(video_6to8[svga->vgapal[svga->dac_write].r & 0x3f], video_6to8[svga->vgapal[svga->dac_write].g & 0x3f], video_6to8[svga->vgapal[svga->dac_write].b & 0x3f]);
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svga->dac_pos = 0;
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svga->dac_write = (svga->dac_write + 1) & 255;
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break;
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}
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break;
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case 0x3ce:
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svga->gdcaddr = val;
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break;
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case 0x3cf:
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o = svga->gdcreg[svga->gdcaddr & 15];
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switch (svga->gdcaddr & 15) {
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case 2:
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svga->colourcompare=val;
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break;
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case 4:
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svga->readplane = val & 3;
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break;
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case 5:
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svga->writemode = val & 3;
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svga->readmode = val & 8;
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svga->chain2_read = val & 0x10;
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break;
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case 6:
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if ((svga->gdcreg[6] & 0xc) != (val & 0xc)) {
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switch (val&0xC) {
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case 0x0: /*128k at A0000*/
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mem_mapping_set_addr(&svga->mapping, 0xa0000, 0x20000);
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svga->banked_mask = 0xffff;
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break;
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case 0x4: /*64k at A0000*/
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mem_mapping_set_addr(&svga->mapping, 0xa0000, 0x10000);
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svga->banked_mask = 0xffff;
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break;
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case 0x8: /*32k at B0000*/
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mem_mapping_set_addr(&svga->mapping, 0xb0000, 0x08000);
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svga->banked_mask = 0x7fff;
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break;
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case 0xC: /*32k at B8000*/
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mem_mapping_set_addr(&svga->mapping, 0xb8000, 0x08000);
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svga->banked_mask = 0x7fff;
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break;
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}
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}
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break;
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case 7:
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svga->colournocare=val;
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break;
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}
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svga->gdcreg[svga->gdcaddr & 15] = val;
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svga->fast = (svga->gdcreg[8] == 0xff && !(svga->gdcreg[3] & 0x18) &&
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!svga->gdcreg[1]) && svga->chain4;
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if (((svga->gdcaddr & 15) == 5 && (val ^ o) & 0x70) ||
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((svga->gdcaddr & 15) == 6 && (val ^ o) & 1))
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svga_recalctimings(svga);
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break;
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}
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}
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uint8_t
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svga_in(uint16_t addr, void *p)
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{
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svga_t *svga = (svga_t *)p;
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uint8_t ret = 0xff;
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switch (addr) {
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case 0x3c0:
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ret = svga->attraddr | svga->attr_palette_enable;
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break;
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case 0x3c1:
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ret = svga->attrregs[svga->attraddr];
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break;
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case 0x3c2:
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if ((svga->vgapal[0].r + svga->vgapal[0].g + svga->vgapal[0].b) >= 0x4e)
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ret = 0;
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else
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ret = 0x10;
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break;
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case 0x3c4:
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ret = svga->seqaddr;
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break;
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case 0x3c5:
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ret = svga->seqregs[svga->seqaddr & 0x0f];
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break;
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case 0x3c6:
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ret = svga->dac_mask;
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break;
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case 0x3c7:
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ret = svga->dac_status;
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break;
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case 0x3c8:
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ret = svga->dac_write;
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break;
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case 0x3c9:
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svga->dac_status = 3;
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switch (svga->dac_pos) {
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case 0:
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svga->dac_pos++;
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if (svga->ramdac_type == RAMDAC_8BIT)
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ret = svga->vgapal[svga->dac_read].r;
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else
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ret = svga->vgapal[svga->dac_read].r & 0x3f;
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break;
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case 1:
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svga->dac_pos++;
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if (svga->ramdac_type == RAMDAC_8BIT)
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ret = svga->vgapal[svga->dac_read].g;
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else
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ret = svga->vgapal[svga->dac_read].g & 0x3f;
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break;
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case 2:
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svga->dac_pos=0;
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svga->dac_read = (svga->dac_read + 1) & 255;
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if (svga->ramdac_type == RAMDAC_8BIT)
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ret = svga->vgapal[(svga->dac_read - 1) & 255].b;
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else
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ret = svga->vgapal[(svga->dac_read - 1) & 255].b & 0x3f;
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break;
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}
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break;
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case 0x3cc:
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ret = svga->miscout;
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break;
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case 0x3ce:
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ret = svga->gdcaddr;
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break;
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case 0x3cf:
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/* The spec says GDC addresses 0xF8 to 0xFB return the latch. */
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switch(svga->gdcaddr) {
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case 0xf8:
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ret = (svga->latch & 0xFF);
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break;
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case 0xf9:
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ret = ((svga->latch & 0xFF00) >> 8);
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break;
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case 0xfa:
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ret = ((svga->latch & 0xFF0000) >> 16);
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break;
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case 0xfb:
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ret = ((svga->latch & 0xFF000000) >> 24);
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break;
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default:
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ret = svga->gdcreg[svga->gdcaddr & 0xf];
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break;
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}
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break;
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case 0x3da:
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svga->attrff = 0;
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svga->attrff = 0;
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if (svga->cgastat & 0x01)
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svga->cgastat &= ~0x30;
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else
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svga->cgastat ^= 0x30;
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ret = svga->cgastat;
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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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svga_set_ramdac_type(svga_t *svga, int type)
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{
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int c;
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if (svga->ramdac_type != type) {
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svga->ramdac_type = type;
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for (c = 0; c < 256; c++) {
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if (svga->ramdac_type == RAMDAC_8BIT)
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svga->pallook[c] = makecol32(svga->vgapal[c].r, svga->vgapal[c].g, svga->vgapal[c].b);
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else
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svga->pallook[c] = makecol32((svga->vgapal[c].r & 0x3f) * 4,
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(svga->vgapal[c].g & 0x3f) * 4,
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(svga->vgapal[c].b & 0x3f) * 4);
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}
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}
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}
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void
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svga_recalctimings(svga_t *svga)
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{
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double crtcconst, _dispontime, _dispofftime, disptime;
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svga->vtotal = svga->crtc[6];
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svga->dispend = svga->crtc[0x12];
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svga->vsyncstart = svga->crtc[0x10];
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svga->split = svga->crtc[0x18];
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svga->vblankstart = svga->crtc[0x15];
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if (svga->crtc[7] & 1)
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svga->vtotal |= 0x100;
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if (svga->crtc[7] & 32)
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svga->vtotal |= 0x200;
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svga->vtotal += 2;
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if (svga->crtc[7] & 2)
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svga->dispend |= 0x100;
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if (svga->crtc[7] & 64)
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svga->dispend |= 0x200;
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svga->dispend++;
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if (svga->crtc[7] & 4)
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svga->vsyncstart |= 0x100;
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if (svga->crtc[7] & 128)
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svga->vsyncstart |= 0x200;
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svga->vsyncstart++;
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if (svga->crtc[7] & 0x10)
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svga->split|=0x100;
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if (svga->crtc[9] & 0x40)
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svga->split|=0x200;
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svga->split++;
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if (svga->crtc[7] & 0x08)
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svga->vblankstart |= 0x100;
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if (svga->crtc[9] & 0x20)
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svga->vblankstart |= 0x200;
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svga->vblankstart++;
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svga->hdisp = svga->crtc[1];
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svga->hdisp++;
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svga->htotal = svga->crtc[0];
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svga->htotal += 6; /*+6 is required for Tyrian*/
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svga->rowoffset = svga->crtc[0x13];
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svga->clock = (svga->vidclock) ? VGACONST2 : VGACONST1;
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svga->lowres = svga->attrregs[0x10] & 0x40;
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svga->interlace = 0;
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svga->ma_latch = (svga->crtc[0xc] << 8) | svga->crtc[0xd];
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svga->hdisp_time = svga->hdisp;
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svga->render = svga_render_blank;
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if (!svga->scrblank && svga->attr_palette_enable) {
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if (!(svga->gdcreg[6] & 1) && !(svga->attrregs[0x10] & 1)) { /*Text mode*/
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if (svga->seqregs[1] & 8) /*40 column*/ {
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svga->render = svga_render_text_40;
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svga->hdisp *= (svga->seqregs[1] & 1) ? 16 : 18;
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} else {
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svga->render = svga_render_text_80;
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svga->hdisp *= (svga->seqregs[1] & 1) ? 8 : 9;
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}
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svga->hdisp_old = svga->hdisp;
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} else {
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svga->hdisp *= (svga->seqregs[1] & 8) ? 16 : 8;
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svga->hdisp_old = svga->hdisp;
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switch (svga->gdcreg[5] & 0x60) {
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case 0x00:
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if (svga->seqregs[1] & 8) /*Low res (320)*/
|
|
svga->render = svga_render_4bpp_lowres;
|
|
else
|
|
svga->render = svga_render_4bpp_highres;
|
|
break;
|
|
case 0x20: /*4 colours*/
|
|
if (svga->seqregs[1] & 8) /*Low res (320)*/
|
|
svga->render = svga_render_2bpp_lowres;
|
|
else
|
|
svga->render = svga_render_2bpp_highres;
|
|
break;
|
|
case 0x40: case 0x60: /*256+ colours*/
|
|
switch (svga->bpp) {
|
|
case 8:
|
|
if (svga->lowres)
|
|
svga->render = svga_render_8bpp_lowres;
|
|
else
|
|
svga->render = svga_render_8bpp_highres;
|
|
break;
|
|
case 15:
|
|
if (svga->lowres)
|
|
svga->render = svga_render_15bpp_lowres;
|
|
else
|
|
svga->render = svga_render_15bpp_highres;
|
|
break;
|
|
case 16:
|
|
if (svga->lowres)
|
|
svga->render = svga_render_16bpp_lowres;
|
|
else
|
|
svga->render = svga_render_16bpp_highres;
|
|
break;
|
|
case 24:
|
|
if (svga->lowres)
|
|
svga->render = svga_render_24bpp_lowres;
|
|
else
|
|
svga->render = svga_render_24bpp_highres;
|
|
break;
|
|
case 32:
|
|
if (svga->lowres)
|
|
svga->render = svga_render_32bpp_lowres;
|
|
else
|
|
svga->render = svga_render_32bpp_highres;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
svga->linedbl = svga->crtc[9] & 0x80;
|
|
svga->rowcount = svga->crtc[9] & 31;
|
|
if (enable_overscan) {
|
|
overscan_y = (svga->rowcount + 1) << 1;
|
|
if (svga->seqregs[1] & 8) /*Low res (320)*/
|
|
overscan_y <<= 1;
|
|
if (overscan_y < 16)
|
|
overscan_y = 16;
|
|
}
|
|
if (svga->recalctimings_ex)
|
|
svga->recalctimings_ex(svga);
|
|
|
|
if (svga->vblankstart < svga->dispend)
|
|
svga->dispend = svga->vblankstart;
|
|
|
|
crtcconst = (svga->seqregs[1] & 1) ? (svga->clock * 8.0) : (svga->clock * 9.0);
|
|
|
|
disptime = svga->htotal;
|
|
_dispontime = svga->hdisp_time;
|
|
|
|
if (svga->seqregs[1] & 8) {
|
|
disptime *= 2;
|
|
_dispontime *= 2;
|
|
}
|
|
_dispofftime = disptime - _dispontime;
|
|
_dispontime *= crtcconst;
|
|
_dispofftime *= crtcconst;
|
|
|
|
svga->dispontime = (int)(_dispontime * (1 << TIMER_SHIFT));
|
|
svga->dispofftime = (int)(_dispofftime * (1 << TIMER_SHIFT));
|
|
}
|
|
|
|
|
|
void
|
|
svga_poll(void *p)
|
|
{
|
|
svga_t *svga = (svga_t *)p;
|
|
uint32_t x;
|
|
int wx, wy;
|
|
|
|
if (!svga->linepos) {
|
|
if (svga->displine == svga->hwcursor_latch.y && svga->hwcursor_latch.ena) {
|
|
svga->hwcursor_on = 64 - svga->hwcursor_latch.yoff;
|
|
svga->hwcursor_oddeven = 0;
|
|
}
|
|
|
|
if (svga->displine == (svga->hwcursor_latch.y + 1) && svga->hwcursor_latch.ena &&
|
|
svga->interlace) {
|
|
svga->hwcursor_on = 64 - (svga->hwcursor_latch.yoff + 1);
|
|
svga->hwcursor_oddeven = 1;
|
|
}
|
|
|
|
if (svga->displine == svga->overlay_latch.y && svga->overlay_latch.ena) {
|
|
svga->overlay_on = svga->overlay_latch.ysize - svga->overlay_latch.yoff;
|
|
svga->overlay_oddeven = 0;
|
|
}
|
|
|
|
if (svga->displine == svga->overlay_latch.y+1 && svga->overlay_latch.ena && svga->interlace) {
|
|
svga->overlay_on = svga->overlay_latch.ysize - svga->overlay_latch.yoff;
|
|
svga->overlay_oddeven = 1;
|
|
}
|
|
|
|
svga->vidtime += svga->dispofftime;
|
|
svga->cgastat |= 1;
|
|
svga->linepos = 1;
|
|
|
|
if (svga->dispon) {
|
|
svga->hdisp_on=1;
|
|
|
|
svga->ma &= svga->vram_display_mask;
|
|
if (svga->firstline == 2000) {
|
|
svga->firstline = svga->displine;
|
|
video_wait_for_buffer();
|
|
}
|
|
|
|
if (svga->hwcursor_on || svga->overlay_on) {
|
|
svga->changedvram[svga->ma >> 12] = svga->changedvram[(svga->ma >> 12) + 1] =
|
|
svga->interlace ? 3 : 2;
|
|
}
|
|
|
|
if (!svga->override)
|
|
svga->render(svga);
|
|
|
|
if (svga->overlay_on) {
|
|
if (!svga->override)
|
|
svga->overlay_draw(svga, svga->displine);
|
|
svga->overlay_on--;
|
|
if (svga->overlay_on && svga->interlace)
|
|
svga->overlay_on--;
|
|
}
|
|
|
|
if (svga->hwcursor_on) {
|
|
if (!svga->override)
|
|
svga->hwcursor_draw(svga, svga->displine);
|
|
svga->hwcursor_on--;
|
|
if (svga->hwcursor_on && svga->interlace)
|
|
svga->hwcursor_on--;
|
|
}
|
|
|
|
if (svga->lastline < svga->displine)
|
|
svga->lastline = svga->displine;
|
|
}
|
|
|
|
svga->displine++;
|
|
if (svga->interlace)
|
|
svga->displine++;
|
|
if ((svga->cgastat & 8) && ((svga->displine & 15) == (svga->crtc[0x11] & 15)) && svga->vslines)
|
|
svga->cgastat &= ~8;
|
|
svga->vslines++;
|
|
if (svga->displine > 1500)
|
|
svga->displine = 0;
|
|
} else {
|
|
svga->vidtime += svga->dispontime;
|
|
|
|
if (svga->dispon)
|
|
svga->cgastat &= ~1;
|
|
svga->hdisp_on = 0;
|
|
|
|
svga->linepos = 0;
|
|
if (svga->sc == (svga->crtc[11] & 31))
|
|
svga->con = 0;
|
|
if (svga->dispon) {
|
|
if (svga->linedbl && !svga->linecountff) {
|
|
svga->linecountff = 1;
|
|
svga->ma = svga->maback;
|
|
} else if (svga->sc == svga->rowcount) {
|
|
svga->linecountff = 0;
|
|
svga->sc = 0;
|
|
|
|
svga->maback += (svga->rowoffset << 3);
|
|
if (svga->interlace)
|
|
svga->maback += (svga->rowoffset << 3);
|
|
svga->maback &= svga->vram_display_mask;
|
|
svga->ma = svga->maback;
|
|
} else {
|
|
svga->linecountff = 0;
|
|
svga->sc++;
|
|
svga->sc &= 31;
|
|
svga->ma = svga->maback;
|
|
}
|
|
}
|
|
svga->vc++;
|
|
svga->vc &= 2047;
|
|
|
|
if (svga->vc == svga->split) {
|
|
svga->ma = svga->maback = 0;
|
|
if (svga->attrregs[0x10] & 0x20)
|
|
svga->scrollcache = 0;
|
|
}
|
|
if (svga->vc == svga->dispend) {
|
|
if (svga->vblank_start)
|
|
svga->vblank_start(svga);
|
|
svga->dispon=0;
|
|
if (svga->crtc[10] & 0x20)
|
|
svga->cursoron = 0;
|
|
else
|
|
svga->cursoron = svga->blink & 16;
|
|
|
|
if (!(svga->gdcreg[6] & 1) && !(svga->blink & 15))
|
|
svga->fullchange = 2;
|
|
svga->blink++;
|
|
|
|
for (x = 0; x < ((svga->vram_mask + 1) >> 12); x++) {
|
|
if (svga->changedvram[x])
|
|
svga->changedvram[x]--;
|
|
}
|
|
if (svga->fullchange)
|
|
svga->fullchange--;
|
|
}
|
|
if (svga->vc == svga->vsyncstart) {
|
|
svga->dispon = 0;
|
|
svga->cgastat |= 8;
|
|
x = svga->hdisp;
|
|
|
|
if (svga->interlace && !svga->oddeven)
|
|
svga->lastline++;
|
|
if (svga->interlace && svga->oddeven)
|
|
svga->firstline--;
|
|
|
|
wx = x;
|
|
wy = svga->lastline - svga->firstline;
|
|
|
|
if (!svga->override)
|
|
svga_doblit(svga->firstline_draw, svga->lastline_draw + 1, wx, wy, svga);
|
|
|
|
svga->firstline = 2000;
|
|
svga->lastline = 0;
|
|
|
|
svga->firstline_draw = 2000;
|
|
svga->lastline_draw = 0;
|
|
|
|
svga->oddeven ^= 1;
|
|
|
|
changeframecount = svga->interlace ? 3 : 2;
|
|
svga->vslines = 0;
|
|
|
|
if (svga->interlace && svga->oddeven)
|
|
svga->ma = svga->maback = svga->ma_latch + (svga->rowoffset << 1);
|
|
else
|
|
svga->ma = svga->maback = svga->ma_latch;
|
|
svga->ca = (svga->crtc[0xe] << 8) | svga->crtc[0xf];
|
|
|
|
svga->ma <<= 2;
|
|
svga->maback <<= 2;
|
|
svga->ca <<= 2;
|
|
|
|
svga->video_res_x = wx;
|
|
svga->video_res_y = wy + 1;
|
|
if (!(svga->gdcreg[6] & 1) && !(svga->attrregs[0x10] & 1)) { /*Text mode*/
|
|
svga->video_res_x /= (svga->seqregs[1] & 1) ? 8 : 9;
|
|
svga->video_res_y /= (svga->crtc[9] & 31) + 1;
|
|
svga->video_bpp = 0;
|
|
} else {
|
|
if (svga->crtc[9] & 0x80)
|
|
svga->video_res_y /= 2;
|
|
if (!(svga->crtc[0x17] & 2))
|
|
svga->video_res_y *= 4;
|
|
else if (!(svga->crtc[0x17] & 1))
|
|
svga->video_res_y *= 2;
|
|
svga->video_res_y /= (svga->crtc[9] & 31) + 1;
|
|
if (svga->lowres)
|
|
svga->video_res_x /= 2;
|
|
|
|
svga->video_bpp = svga->bpp;
|
|
}
|
|
}
|
|
if (svga->vc == svga->vtotal) {
|
|
svga->vc = 0;
|
|
svga->sc = svga->crtc[8] & 0x1f;
|
|
svga->dispon = 1;
|
|
svga->displine = (svga->interlace && svga->oddeven) ? 1 : 0;
|
|
svga->scrollcache = svga->attrregs[0x13] & 7;
|
|
svga->linecountff = 0;
|
|
|
|
svga->hwcursor_on = 0;
|
|
svga->hwcursor_latch = svga->hwcursor;
|
|
|
|
svga->overlay_on = 0;
|
|
svga->overlay_latch = svga->overlay;
|
|
}
|
|
if (svga->sc == (svga->crtc[10] & 31))
|
|
svga->con = 1;
|
|
}
|
|
}
|
|
|
|
|
|
int
|
|
svga_init(svga_t *svga, void *p, int memsize,
|
|
void (*recalctimings_ex)(struct svga_t *svga),
|
|
uint8_t (*video_in) (uint16_t addr, void *p),
|
|
void (*video_out)(uint16_t addr, uint8_t val, void *p),
|
|
void (*hwcursor_draw)(struct svga_t *svga, int displine),
|
|
void (*overlay_draw)(struct svga_t *svga, int displine))
|
|
{
|
|
int c, d, e;
|
|
|
|
svga->p = p;
|
|
|
|
for (c = 0; c < 256; c++) {
|
|
e = c;
|
|
for (d = 0; d < 8; d++) {
|
|
svga_rotate[d][c] = e;
|
|
e = (e >> 1) | ((e & 1) ? 0x80 : 0);
|
|
}
|
|
}
|
|
svga->readmode = 0;
|
|
|
|
svga->attrregs[0x11] = 0;
|
|
svga->overscan_color = 0x000000;
|
|
|
|
overscan_x = 16;
|
|
overscan_y = 32;
|
|
|
|
svga->crtc[0] = 63;
|
|
svga->crtc[6] = 255;
|
|
svga->dispontime = svga->dispofftime = 1000 * (1 << TIMER_SHIFT);
|
|
svga->bpp = 8;
|
|
svga->vram = malloc(memsize);
|
|
svga->vram_max = memsize;
|
|
svga->vram_display_mask = svga->vram_mask = memsize - 1;
|
|
svga->decode_mask = 0x7fffff;
|
|
svga->changedvram = malloc(0x800000 >> 12);
|
|
svga->recalctimings_ex = recalctimings_ex;
|
|
svga->video_in = video_in;
|
|
svga->video_out = video_out;
|
|
svga->hwcursor_draw = hwcursor_draw;
|
|
svga->overlay_draw = overlay_draw;
|
|
|
|
mem_mapping_add(&svga->mapping, 0xa0000, 0x20000,
|
|
svga_read, svga_readw, svga_readl,
|
|
svga_write, svga_writew, svga_writel,
|
|
NULL, MEM_MAPPING_EXTERNAL, svga);
|
|
|
|
timer_add(svga_poll, &svga->vidtime, TIMER_ALWAYS_ENABLED, svga);
|
|
|
|
svga_pri = svga;
|
|
|
|
svga->ramdac_type = RAMDAC_6BIT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
void
|
|
svga_close(svga_t *svga)
|
|
{
|
|
free(svga->changedvram);
|
|
free(svga->vram);
|
|
|
|
svga_pri = NULL;
|
|
}
|
|
|
|
|
|
void
|
|
svga_write_common(uint32_t addr, uint8_t val, uint8_t linear, void *p)
|
|
{
|
|
svga_t *svga = (svga_t *)p;
|
|
|
|
int func_select, writemask2 = svga->writemask;
|
|
uint32_t write_mask, bit_mask, set_mask, val32 = (uint32_t) val;
|
|
|
|
egawrites++;
|
|
|
|
cycles -= video_timing_write_b;
|
|
|
|
if (!linear) {
|
|
addr &= svga->banked_mask;
|
|
addr += svga->write_bank;
|
|
}
|
|
|
|
if (!(svga->gdcreg[6] & 1))
|
|
svga->fullchange = 2;
|
|
|
|
if ((svga->chain4 || svga->fb_only) && (svga->writemode < 4)) {
|
|
writemask2 = 1 << (addr & 3);
|
|
addr &= ~3;
|
|
} else if (svga->chain2_write) {
|
|
writemask2 &= ~0xa;
|
|
if (addr & 1)
|
|
writemask2 <<= 1;
|
|
addr &= ~1;
|
|
addr <<= 2;
|
|
} else
|
|
addr <<= 2;
|
|
addr &= svga->decode_mask;
|
|
|
|
if (addr >= svga->vram_max)
|
|
return;
|
|
|
|
addr &= svga->vram_mask;
|
|
|
|
svga->changedvram[addr >> 12] = changeframecount;
|
|
|
|
/* standard VGA latched access */
|
|
func_select = (svga->gdcreg[3] >> 3) & 3;
|
|
|
|
switch (svga->writemode) {
|
|
case 0:
|
|
/* rotate */
|
|
if (svga->gdcreg[3] & 7)
|
|
val32 = svga_rotate[svga->gdcreg[3] & 7][val32];
|
|
|
|
/* apply set/reset mask */
|
|
bit_mask = svga->gdcreg[8];
|
|
|
|
val32 |= (val32 << 8);
|
|
val32 |= (val32 << 16);
|
|
|
|
if (svga->gdcreg[8] == 0xff && !(svga->gdcreg[3] & 0x18) &&
|
|
(!svga->gdcreg[1] || svga->set_reset_disabled)) {
|
|
/* mask data according to sr[2] */
|
|
write_mask = mask16[writemask2 & 0x0f];
|
|
addr >>= 2;
|
|
((uint32_t *)(svga->vram))[addr] &= ~write_mask;
|
|
((uint32_t *)(svga->vram))[addr] |= (val32 & write_mask);
|
|
return;
|
|
}
|
|
|
|
set_mask = mask16[svga->gdcreg[1] & 0x0f];
|
|
val32 = (val32 & ~set_mask) | (mask16[svga->gdcreg[0] & 0x0f] & set_mask);
|
|
break;
|
|
case 1:
|
|
val32 = svga->latch;
|
|
|
|
/* mask data according to sr[2] */
|
|
write_mask = mask16[writemask2 & 0x0f];
|
|
addr >>= 2;
|
|
((uint32_t *)(svga->vram))[addr] &= ~write_mask;
|
|
((uint32_t *)(svga->vram))[addr] |= (val32 & write_mask);
|
|
return;
|
|
case 2:
|
|
val32 = mask16[val32 & 0x0f];
|
|
bit_mask = svga->gdcreg[8];
|
|
|
|
if (!(svga->gdcreg[3] & 0x18) && (!svga->gdcreg[1] || svga->set_reset_disabled))
|
|
func_select = 0;
|
|
break;
|
|
case 3:
|
|
/* rotate */
|
|
if (svga->gdcreg[3] & 7)
|
|
val32 = svga_rotate[svga->gdcreg[3] & 7][val];
|
|
|
|
bit_mask = svga->gdcreg[8] & val32;
|
|
val32 = mask16[svga->gdcreg[0] & 0x0f];
|
|
break;
|
|
default:
|
|
if (svga->ven_write)
|
|
svga->ven_write(svga, val, addr);
|
|
return;
|
|
}
|
|
|
|
/* apply bit mask */
|
|
bit_mask |= bit_mask << 8;
|
|
bit_mask |= bit_mask << 16;
|
|
|
|
/* apply logical operation */
|
|
switch(func_select) {
|
|
case 0:
|
|
default:
|
|
/* set */
|
|
val32 &= bit_mask;
|
|
val32 |= (svga->latch & ~bit_mask);
|
|
break;
|
|
case 1:
|
|
/* and */
|
|
val32 |= ~bit_mask;
|
|
val32 &= svga->latch;
|
|
break;
|
|
case 2:
|
|
/* or */
|
|
val32 &= bit_mask;
|
|
val32 |= svga->latch;
|
|
break;
|
|
case 3:
|
|
/* xor */
|
|
val32 &= bit_mask;
|
|
val32 ^= svga->latch;
|
|
break;
|
|
}
|
|
|
|
/* mask data according to sr[2] */
|
|
write_mask = mask16[writemask2 & 0x0f];
|
|
addr >>= 2;
|
|
((uint32_t *)(svga->vram))[addr] = (((uint32_t *)(svga->vram))[addr] & ~write_mask) | (val32 & write_mask);
|
|
}
|
|
|
|
|
|
uint8_t
|
|
svga_read_common(uint32_t addr, uint8_t linear, void *p)
|
|
{
|
|
svga_t *svga = (svga_t *)p;
|
|
uint32_t latch_addr, ret;
|
|
int readplane = svga->readplane;
|
|
uint8_t ret8;
|
|
|
|
cycles -= video_timing_read_b;
|
|
|
|
egareads++;
|
|
|
|
if (!linear) {
|
|
addr &= svga->banked_mask;
|
|
addr += svga->read_bank;
|
|
|
|
latch_addr = (addr << 2) & svga->decode_mask;
|
|
}
|
|
|
|
if (svga->chain4 || svga->fb_only) {
|
|
addr &= svga->decode_mask;
|
|
if (addr >= svga->vram_max)
|
|
return 0xff;
|
|
return svga->vram[addr & svga->vram_mask];
|
|
} else if (svga->chain2_read) {
|
|
readplane = (readplane & 2) | (addr & 1);
|
|
addr &= ~1;
|
|
addr <<= 2;
|
|
} else
|
|
addr <<= 2;
|
|
|
|
addr &= svga->decode_mask;
|
|
|
|
/* standard VGA latched access */
|
|
if (linear) {
|
|
if (addr >= svga->vram_max)
|
|
return 0xff;
|
|
|
|
addr &= svga->vram_mask;
|
|
|
|
svga->latch = ((uint32_t *)(svga->vram))[addr >> 2];
|
|
} else {
|
|
if (latch_addr > svga->vram_max)
|
|
svga->latch = 0xffffffff;
|
|
else {
|
|
latch_addr &= svga->vram_mask;
|
|
svga->latch = ((uint32_t *)(svga->vram))[latch_addr >> 2];
|
|
}
|
|
|
|
if (addr >= svga->vram_max)
|
|
return 0xff;
|
|
|
|
addr &= svga->vram_mask;
|
|
}
|
|
|
|
if (!(svga->gdcreg[5] & 8)) {
|
|
/* read mode 0 */
|
|
return svga->vram[addr | readplane];
|
|
} else {
|
|
/* read mode 1 */
|
|
ret = (svga->latch ^ mask16[svga->colourcompare & 0x0f]) & mask16[svga->colournocare & 0x0f];
|
|
ret8 = (ret & 0xff);
|
|
ret8 |= ((ret >> 24) & 0xff);
|
|
ret8 |= ((ret >> 16) & 0xff);
|
|
ret8 |= ((ret >> 8) & 0xff);
|
|
return(~ret8);
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
svga_write(uint32_t addr, uint8_t val, void *p)
|
|
{
|
|
svga_write_common(addr, val, 0, p);
|
|
}
|
|
|
|
|
|
void
|
|
svga_write_linear(uint32_t addr, uint8_t val, void *p)
|
|
{
|
|
svga_write_common(addr, val, 1, p);
|
|
}
|
|
|
|
|
|
uint8_t
|
|
svga_read(uint32_t addr, void *p)
|
|
{
|
|
return svga_read_common(addr, 0, p);
|
|
}
|
|
|
|
|
|
uint8_t
|
|
svga_read_linear(uint32_t addr, void *p)
|
|
{
|
|
return svga_read_common(addr, 1, p);
|
|
}
|
|
|
|
|
|
void
|
|
svga_doblit(int y1, int y2, int wx, int wy, svga_t *svga)
|
|
{
|
|
int y_add = (enable_overscan) ? overscan_y : 0;
|
|
int x_add = (enable_overscan) ? 16 : 0;
|
|
uint32_t *p;
|
|
int i, j;
|
|
|
|
svga->frames++;
|
|
|
|
if ((xsize > 2032) || (ysize > 2032)) {
|
|
x_add = 0;
|
|
y_add = 0;
|
|
suppress_overscan = 1;
|
|
} else
|
|
suppress_overscan = 0;
|
|
|
|
if (y1 > y2) {
|
|
video_blit_memtoscreen(32, 0, 0, 0, xsize + x_add, ysize + y_add);
|
|
return;
|
|
}
|
|
|
|
if ((wx != xsize) || ((wy + 1) != ysize) || video_force_resize_get()) {
|
|
/* Screen res has changed.. fix up, and let them know. */
|
|
xsize = wx;
|
|
ysize = wy + 1;
|
|
if (xsize < 64)
|
|
xsize = 640;
|
|
if (ysize < 32)
|
|
ysize = 200;
|
|
|
|
set_screen_size(xsize+x_add,ysize+y_add);
|
|
|
|
if (video_force_resize_get())
|
|
video_force_resize_set(0);
|
|
}
|
|
|
|
if (enable_overscan && !suppress_overscan) {
|
|
if ((wx >= 160) && ((wy + 1) >= 120)) {
|
|
/* Draw (overscan_size - scroll size) lines of overscan on top. */
|
|
for (i = 0; i < (y_add >> 1); i++) {
|
|
p = &((uint32_t *)buffer32->line[i & 0x7ff])[32];
|
|
|
|
for (j = 0; j < (xsize + x_add); j++)
|
|
p[j] = svga_color_transform(svga->overscan_color);
|
|
}
|
|
|
|
/* Draw (overscan_size + scroll size) lines of overscan on the bottom. */
|
|
for (i = 0; i < (y_add >> 1); i++) {
|
|
p = &((uint32_t *)buffer32->line[(ysize + (y_add >> 1) + i) & 0x7ff])[32];
|
|
|
|
for (j = 0; j < (xsize + x_add); j++)
|
|
p[j] = svga_color_transform(svga->overscan_color);
|
|
}
|
|
|
|
for (i = (y_add >> 1); i < (ysize + (y_add >> 1)); i ++) {
|
|
p = &((uint32_t *)buffer32->line[i & 0x7ff])[32];
|
|
|
|
for (j = 0; j < 8; j++) {
|
|
p[j] = svga->pallook[svga->overscan_color];
|
|
p[xsize + (x_add >> 1) + j] = svga_color_transform(svga->overscan_color);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
video_blit_memtoscreen(32, 0, y1, y2 + y_add, xsize + x_add, ysize + y_add);
|
|
}
|
|
|
|
|
|
void
|
|
svga_writeb_linear(uint32_t addr, uint8_t val, void *p)
|
|
{
|
|
svga_t *svga = (svga_t *)p;
|
|
|
|
if (!svga->fast) {
|
|
svga_write_linear(addr, val, p);
|
|
return;
|
|
}
|
|
|
|
egawrites++;
|
|
|
|
addr &= svga->decode_mask;
|
|
if (addr >= svga->vram_max)
|
|
return;
|
|
addr &= svga->vram_mask;
|
|
svga->changedvram[addr >> 12] = changeframecount;
|
|
*(uint8_t *)&svga->vram[addr] = val;
|
|
}
|
|
|
|
|
|
void
|
|
svga_writew_common(uint32_t addr, uint16_t val, uint8_t linear, void *p)
|
|
{
|
|
svga_t *svga = (svga_t *)p;
|
|
|
|
if (!svga->fast) {
|
|
svga_write_common(addr, val, linear, p);
|
|
svga_write_common(addr + 1, val >> 8, linear, p);
|
|
return;
|
|
}
|
|
|
|
egawrites += 2;
|
|
|
|
cycles -= video_timing_write_w;
|
|
|
|
if (!linear)
|
|
addr = (addr & svga->banked_mask) + svga->write_bank;
|
|
addr &= svga->decode_mask;
|
|
if (addr >= svga->vram_max)
|
|
return;
|
|
addr &= svga->vram_mask;
|
|
svga->changedvram[addr >> 12] = changeframecount;
|
|
*(uint16_t *)&svga->vram[addr] = val;
|
|
}
|
|
|
|
|
|
void
|
|
svga_writew(uint32_t addr, uint16_t val, void *p)
|
|
{
|
|
svga_writew_common(addr, val, 0, p);
|
|
}
|
|
|
|
|
|
void
|
|
svga_writew_linear(uint32_t addr, uint16_t val, void *p)
|
|
{
|
|
svga_writew_common(addr, val, 1, p);
|
|
}
|
|
|
|
|
|
void
|
|
svga_writel_common(uint32_t addr, uint32_t val, uint8_t linear, void *p)
|
|
{
|
|
svga_t *svga = (svga_t *)p;
|
|
|
|
if (!svga->fast) {
|
|
svga_write(addr, val, p);
|
|
svga_write(addr + 1, val >> 8, p);
|
|
svga_write(addr + 2, val >> 16, p);
|
|
svga_write(addr + 3, val >> 24, p);
|
|
return;
|
|
}
|
|
|
|
egawrites += 4;
|
|
|
|
cycles -= video_timing_write_l;
|
|
|
|
if (!linear)
|
|
addr = (addr & svga->banked_mask) + svga->write_bank;
|
|
addr &= svga->decode_mask;
|
|
if (addr >= svga->vram_max)
|
|
return;
|
|
addr &= svga->vram_mask;
|
|
|
|
svga->changedvram[addr >> 12] = changeframecount;
|
|
*(uint32_t *)&svga->vram[addr] = val;
|
|
}
|
|
|
|
|
|
void
|
|
svga_writel(uint32_t addr, uint32_t val, void *p)
|
|
{
|
|
svga_writel_common(addr, val, 0, p);
|
|
}
|
|
|
|
|
|
void
|
|
svga_writel_linear(uint32_t addr, uint32_t val, void *p)
|
|
{
|
|
svga_writel_common(addr, val, 1, p);
|
|
}
|
|
|
|
|
|
uint8_t
|
|
svga_readb_linear(uint32_t addr, void *p)
|
|
{
|
|
svga_t *svga = (svga_t *)p;
|
|
|
|
if (!svga->fast)
|
|
return svga_read_linear(addr, p);
|
|
|
|
egareads++;
|
|
|
|
addr &= svga->decode_mask;
|
|
if (addr >= svga->vram_max)
|
|
return 0xff;
|
|
|
|
return *(uint8_t *)&svga->vram[addr & svga->vram_mask];
|
|
}
|
|
|
|
|
|
uint16_t
|
|
svga_readw_common(uint32_t addr, uint8_t linear, void *p)
|
|
{
|
|
svga_t *svga = (svga_t *)p;
|
|
|
|
if (!svga->fast)
|
|
return svga_read_common(addr, linear, p) | (svga_read_common(addr + 1, linear, p) << 8);
|
|
|
|
egareads += 2;
|
|
|
|
cycles -= video_timing_read_w;
|
|
|
|
if (!linear)
|
|
addr = (addr & svga->banked_mask) + svga->read_bank;
|
|
addr &= svga->decode_mask;
|
|
if (addr >= svga->vram_max)
|
|
return 0xffff;
|
|
|
|
return *(uint16_t *)&svga->vram[addr & svga->vram_mask];
|
|
}
|
|
|
|
|
|
uint16_t
|
|
svga_readw(uint32_t addr, void *p)
|
|
{
|
|
return svga_readw_common(addr, 0, p);
|
|
}
|
|
|
|
|
|
uint16_t
|
|
svga_readw_linear(uint32_t addr, void *p)
|
|
{
|
|
return svga_readw_common(addr, 1, p);
|
|
}
|
|
|
|
|
|
uint32_t
|
|
svga_readl_common(uint32_t addr, uint8_t linear, void *p)
|
|
{
|
|
svga_t *svga = (svga_t *)p;
|
|
|
|
if (!svga->fast) {
|
|
return svga_read_common(addr, linear, p) | (svga_read_common(addr + 1, linear, p) << 8) |
|
|
(svga_read_common(addr + 2, linear, p) << 16) | (svga_read_common(addr + 3, linear, p) << 24);
|
|
}
|
|
|
|
egareads += 4;
|
|
|
|
cycles -= video_timing_read_l;
|
|
|
|
if (!linear)
|
|
addr = (addr & svga->banked_mask) + svga->read_bank;
|
|
addr &= svga->decode_mask;
|
|
if (addr >= svga->vram_max)
|
|
return 0xffffffff;
|
|
|
|
return *(uint32_t *)&svga->vram[addr & svga->vram_mask];
|
|
}
|
|
|
|
|
|
uint32_t
|
|
svga_readl(uint32_t addr, void *p)
|
|
{
|
|
return svga_readl_common(addr, 0, p);
|
|
}
|
|
|
|
|
|
uint32_t
|
|
svga_readl_linear(uint32_t addr, void *p)
|
|
{
|
|
return svga_readl_common(addr, 1, p);
|
|
}
|
|
|
|
|
|
void
|
|
svga_add_status_info(char *s, int max_len, void *p)
|
|
{
|
|
svga_t *svga = (svga_t *)p;
|
|
char temps[128];
|
|
|
|
if (svga->chain4)
|
|
strcpy(temps, "SVGA chained (possibly mode 13h)\n");
|
|
else
|
|
strcpy(temps, "SVGA unchained (possibly mode-X)\n");
|
|
strncat(s, temps, max_len);
|
|
|
|
if (!svga->video_bpp)
|
|
strcpy(temps, "SVGA in text mode\n");
|
|
else
|
|
sprintf(temps, "SVGA colour depth : %i bpp\n", svga->video_bpp);
|
|
strncat(s, temps, max_len);
|
|
|
|
sprintf(temps, "SVGA resolution : %i x %i\n", svga->video_res_x, svga->video_res_y);
|
|
strncat(s, temps, max_len);
|
|
|
|
sprintf(temps, "SVGA refresh rate : %i Hz\n\n", svga->frames);
|
|
svga->frames = 0;
|
|
strncat(s, temps, max_len);
|
|
}
|