9bf1cd50f5
Removed threading support in SDL Rewrite of VGA Drawing to work line for line Rewrite of VGA Text drawing using lookup tables Rewrite of render function to handle the new line for line drawing. Changed CGA/TANDY/Hercules to be more like their original hardware. Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1611
162 lines
4 KiB
C++
162 lines
4 KiB
C++
/*
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* Copyright (C) 2002-2004 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_2_Table[16];
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Bit32u CGA_4_Table[256];
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Bit32u CGA_16_Table[256];
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Bit32u TXT_Font_Table[16];
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Bit32u TXT_FG_Table[16];
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Bit32u TXT_BG_Table[16];
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Bit32u ExpandTable[256];
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Bit32u Expand16Table[4][16];
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Bit32u FillTable[16];
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Bit32u ColorTable[16];
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void VGA_SetMode(VGAModes mode) {
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if (vga.mode == mode) return;
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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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TXT_FG_Table[i]=i | (i << 8)| (i <<16) | (i << 24);
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TXT_BG_Table[i]=i | (i << 8)| (i <<16) | (i << 24);
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#ifdef WORDS_BIGENDIAN
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CGA_2_Table[i]=((i>>0)&1) | (((i>>1)&1) << 8)| (((i>>1)&1) <<16) | (((i>>3)&1) << 24);
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FillTable[i]=
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((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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TXT_Font_Table[i]=
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((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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#else
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CGA_2_Table[i]=((i>>3)&1) | (((i>>2)&1) << 8)| (((i>>1)&1) <<16) | (((i>>0)&1) << 24);
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FillTable[i]=
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((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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TXT_Font_Table[i]=
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((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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#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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}
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