c908fa9a09
Support for dual CGA palette and background colors Support for attribute palette group changing Changes to work together with bios somewhat in supporting different video cards Basic support for Tandy pcjr 320x200x16 color mode Text mode support for changing font and panning support. Support for data rotate in 16 color modes. Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1063
158 lines
3.9 KiB
C++
158 lines
3.9 KiB
C++
/*
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* Copyright (C) 2002-2003 The DOSBox Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "dosbox.h"
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#include "video.h"
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#include "pic.h"
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#include "timer.h"
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#include "vga.h"
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#include "inout.h"
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VGA_Type vga;
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Bit32u CGA_4_Table[256];
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Bit32u ExpandTable[256];
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Bit32u Expand16Table[4][16];
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Bit32u Expand16BigTable[0x10000];
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Bit32u FillTable[16];
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void VGA_SetMode(VGAModes mode) {
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vga.mode=mode;
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VGA_SetupHandlers();
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VGA_StartResize();
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}
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void VGA_StartResize(void) {
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if (!vga.draw.resizing) {
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vga.draw.resizing=true;
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/* Start a resize after 50 ms */
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PIC_AddEvent(VGA_SetupDrawing,50000);
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}
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}
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void VGA_SetClock(Bitu which,Bitu target) {
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struct{
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Bitu n,m;
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Bits err;
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} best;
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best.err=target;
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Bitu n,m,r;
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for (r = 0; r <= 3; r++) {
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Bitu f_vco = target * (1 << r);
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if (MIN_VCO <= f_vco && f_vco < MAX_VCO) break;
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}
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for (n=1;n<=31;n++) {
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m=(target * (n + 2) * (1 << r) + (S3_CLOCK_REF/2)) / S3_CLOCK_REF - 2;
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if (0 <= m && m <= 127) {
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Bitu temp_target = S3_CLOCK(m,n,r);
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Bits err = target - temp_target;
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if (err < 0) err = -err;
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if (err < best.err) {
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best.err = err;
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best.m = m;
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best.n = n;
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}
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}
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}
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/* Program the s3 clock chip */
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vga.s3.clk[which].m=best.m;
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vga.s3.clk[which].r=r;
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vga.s3.clk[which].n=best.n;
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VGA_StartResize();
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}
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void VGA_Init(Section* sec) {
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vga.draw.resizing=false;
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VGA_SetupMemory();
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VGA_SetupMisc();
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VGA_SetupDAC();
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VGA_SetupGFX();
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VGA_SetupSEQ();
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VGA_SetupAttr();
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VGA_SetClock(0,CLK_25);
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VGA_SetClock(1,CLK_28);
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/* Generate tables */
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Bitu i,j;
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for (i=0;i<256;i++) {
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ExpandTable[i]=i | (i << 8)| (i <<16) | (i << 24);
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#ifdef WORDS_BIGENDIAN
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CGA_4_Table[i]=((i>>0)&3) | (((i>>2)&3) << 8)| (((i>>4)&3) <<16) | (((i>>6)&3) << 24);
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#else
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CGA_4_Table[i]=((i>>6)&3) | (((i>>4)&3) << 8)| (((i>>2)&3) <<16) | (((i>>0)&3) << 24);
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#endif
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}
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for (i=0;i<16;i++) {
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#ifdef WORDS_BIGENDIAN
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FillTable[i]= ((i & 1) ? 0xff000000 : 0) |
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((i & 2) ? 0x00ff0000 : 0) |
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((i & 4) ? 0x0000ff00 : 0) |
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((i & 8) ? 0x000000ff : 0) ;
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#else
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FillTable[i]= ((i & 1) ? 0x000000ff : 0) |
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((i & 2) ? 0x0000ff00 : 0) |
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((i & 4) ? 0x00ff0000 : 0) |
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((i & 8) ? 0xff000000 : 0) ;
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#endif
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}
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for (j=0;j<4;j++) {
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for (i=0;i<16;i++) {
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#ifdef WORDS_BIGENDIAN
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Expand16Table[j][i] =
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((i & 1) ? 1 << j : 0) |
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((i & 2) ? 1 << (8 + j) : 0) |
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((i & 4) ? 1 << (16 + j) : 0) |
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((i & 8) ? 1 << (24 + j) : 0);
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#else
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Expand16Table[j][i] =
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((i & 1) ? 1 << (24 + j) : 0) |
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((i & 2) ? 1 << (16 + j) : 0) |
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((i & 4) ? 1 << (8 + j) : 0) |
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((i & 8) ? 1 << j : 0);
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#endif
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}
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}
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for (i=0;i<0x10000;i++) {
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Bit32u val=0;
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if (i & 0x1) val|=0x1 << 24;
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if (i & 0x2) val|=0x1 << 16;
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if (i & 0x4) val|=0x1 << 8;
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if (i & 0x8) val|=0x1 << 0;
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if (i & 0x10) val|=0x4 << 24;
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if (i & 0x20) val|=0x4 << 16;
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if (i & 0x40) val|=0x4 << 8;
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if (i & 0x80) val|=0x4 << 0;
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if (i & 0x100) val|=0x2 << 24;
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if (i & 0x200) val|=0x2 << 16;
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if (i & 0x400) val|=0x2 << 8;
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if (i & 0x800) val|=0x2 << 0;
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if (i & 0x1000) val|=0x8 << 24;
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if (i & 0x2000) val|=0x8 << 16;
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if (i & 0x4000) val|=0x8 << 8;
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if (i & 0x8000) val|=0x8 << 0;
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Expand16BigTable[i]=val;
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}
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}
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