197 lines
5 KiB
C++
197 lines
5 KiB
C++
/*
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* Copyright (C) 2002-2005 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 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 "dosbox.h"
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#include "video.h"
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#include "pic.h"
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#include "vga.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_DetermineMode(void) {
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/* Test for VGA output active or direct color modes */
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if (vga.s3.misc_control_2 & 0xf0) {
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switch (vga.s3.misc_control_2 >> 4) {
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case 1:VGA_SetMode(M_LIN8);break;
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}
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/* Test for graphics or alphanumeric mode */
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} else if (vga.attr.mode_control & 1) {
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if (!(vga.crtc.mode_control & 0x1)) {
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if (vga.gfx.mode & 0x20) VGA_SetMode(M_CGA4);
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else VGA_SetMode(M_CGA2);
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} else if (vga.attr.mode_control & 0x40) {
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VGA_SetMode(M_VGA);
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} else VGA_SetMode(M_EGA16);
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} else {
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VGA_SetMode(M_TEXT);
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}
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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,50);
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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_SetCGA2Table(Bit8u val0,Bit8u val1) {
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Bit8u total[2]={ val0,val1};
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for (Bitu i=0;i<16;i++) {
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CGA_2_Table[i]=
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#ifdef WORDS_BIGENDIAN
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(total[(i >> 0) & 1] << 0 ) | (total[(i >> 1) & 1] << 8 ) |
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(total[(i >> 2) & 1] << 16 ) | (total[(i >> 3) & 1] << 24 );
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#else
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(total[(i >> 3) & 1] << 0 ) | (total[(i >> 2) & 1] << 8 ) |
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(total[(i >> 1) & 1] << 16 ) | (total[(i >> 0) & 1] << 24 );
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#endif
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}
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}
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void VGA_SetCGA4Table(Bit8u val0,Bit8u val1,Bit8u val2,Bit8u val3) {
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Bit8u total[4]={ val0,val1,val2,val3};
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for (Bitu i=0;i<256;i++) {
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CGA_4_Table[i]=
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#ifdef WORDS_BIGENDIAN
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(total[(i >> 0) & 3] << 0 ) | (total[(i >> 2) & 3] << 8 ) |
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(total[(i >> 4) & 3] << 16 ) | (total[(i >> 6) & 3] << 24 );
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#else
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(total[(i >> 6) & 3] << 0 ) | (total[(i >> 4) & 3] << 8 ) |
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(total[(i >> 2) & 3] << 16 ) | (total[(i >> 0) & 3] << 24 );
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#endif
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}
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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.mode=M_ERROR; //For first init
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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_SetupOther();
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VGA_SetupXGA();
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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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VGA_SetCGA2Table(0,1);
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VGA_SetCGA4Table(0,1,2,3);
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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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}
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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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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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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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