/* * Copyright (C) 2002-2011 The DOSBox Team * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "dosbox.h" #include "inout.h" #include "vga.h" #define attr(blah) vga.attr.blah void VGA_ATTR_SetPalette(Bit8u index,Bit8u val) { vga.attr.palette[index] = val; if (vga.attr.mode_control & 0x80) val = (val&0xf) | (vga.attr.color_select << 4); val &= 63; val |= (vga.attr.color_select & 0xc) << 4; if (GCC_UNLIKELY(machine==MCH_EGA)) { if ((vga.crtc.vertical_total | ((vga.crtc.overflow & 1) << 8)) == 260) { // check for intensity bit if (val&0x10) val|=0x38; else { val&=0x7; // check for special brown if (val==6) val=0x14; } } } VGA_DAC_CombineColor(index,val); } Bitu read_p3c0(Bitu /*port*/,Bitu /*iolen*/) { // Wcharts, Win 3.11 & 95 SVGA Bitu retval = attr(index) & 0x1f; if (!(attr(disabled) & 0x1)) retval |= 0x20; return retval; } void write_p3c0(Bitu /*port*/,Bitu val,Bitu iolen) { if (!vga.internal.attrindex) { attr(index)=val & 0x1F; vga.internal.attrindex=true; if (val & 0x20) attr(disabled) &= ~1; else attr(disabled) |= 1; /* 0-4 Address of data register to write to port 3C0h or read from port 3C1h 5 If set screen output is enabled and the palette can not be modified, if clear screen output is disabled and the palette can be modified. */ return; } else { vga.internal.attrindex=false; switch (attr(index)) { /* Palette */ case 0x00: case 0x01: case 0x02: case 0x03: case 0x04: case 0x05: case 0x06: case 0x07: case 0x08: case 0x09: case 0x0a: case 0x0b: case 0x0c: case 0x0d: case 0x0e: case 0x0f: if (attr(disabled) & 0x1) VGA_ATTR_SetPalette(attr(index),(Bit8u)val); /* 0-5 Index into the 256 color DAC table. May be modified by 3C0h index 10h and 14h. */ break; case 0x10: { /* Mode Control Register */ if (!IS_VGA_ARCH) val&=0x1f; // not really correct, but should do it Bitu difference = attr(mode_control)^val; attr(mode_control)=(Bit8u)val; if (difference & 0x80) { for (Bit8u i=0;i<0x10;i++) VGA_ATTR_SetPalette(i,vga.attr.palette[i]); } if (difference & 0x08) VGA_SetBlinking(val & 0x8); if (difference & 0x41) VGA_DetermineMode(); if (difference & 0x04) { // recompute the panning value if(vga.mode==M_TEXT) { Bit8u pan_reg = attr(horizontal_pel_panning); if (pan_reg > 7) vga.config.pel_panning=0; else if (val&0x4) // 9-dot wide characters vga.config.pel_panning=(Bit8u)(pan_reg+1); else // 8-dot characters vga.config.pel_panning=(Bit8u)pan_reg; } } /* 0 Graphics mode if set, Alphanumeric mode else. 1 Monochrome mode if set, color mode else. 2 9-bit wide characters if set. The 9th bit of characters C0h-DFh will be the same as the 8th bit. Otherwise it will be the background color. 3 If set Attribute bit 7 is blinking, else high intensity. 5 If set the PEL panning register (3C0h index 13h) is temporarily set to 0 from when the line compare causes a wrap around until the next vertical retrace when the register is automatically reloaded with the old value, else the PEL panning register ignores line compares. 6 If set pixels are 8 bits wide. Used in 256 color modes. 7 If set bit 4-5 of the index into the DAC table are taken from port 3C0h index 14h bit 0-1, else the bits in the palette register are used. */ break; } case 0x11: /* Overscan Color Register */ attr(overscan_color)=(Bit8u)val; /* 0-5 Color of screen border. Color is defined as in the palette registers. */ break; case 0x12: /* Color Plane Enable Register */ /* Why disable colour planes? */ attr(color_plane_enable)=(Bit8u)val; /* 0 Bit plane 0 is enabled if set. 1 Bit plane 1 is enabled if set. 2 Bit plane 2 is enabled if set. 3 Bit plane 3 is enabled if set. 4-5 Video Status MUX. Diagnostics use only. Two attribute bits appear on bits 4 and 5 of the Input Status Register 1 (3dAh). 0: Bit 2/0, 1: Bit 5/4, 2: bit 3/1, 3: bit 7/6 */ break; case 0x13: /* Horizontal PEL Panning Register */ attr(horizontal_pel_panning)=val & 0xF; switch (vga.mode) { case M_TEXT: if (val > 7) vga.config.pel_panning=0; else if (vga.attr.mode_control&0x4) // 9-dot wide characters vga.config.pel_panning=(Bit8u)(val+1); else // 8-dot characters vga.config.pel_panning=(Bit8u)val; break; case M_VGA: case M_LIN8: vga.config.pel_panning=(val & 0x7)/2; break; case M_LIN16: default: vga.config.pel_panning=(val & 0x7); } if (machine==MCH_EGA) // On the EGA panning can be programmed for every scanline: vga.draw.panning = vga.config.pel_panning; /* 0-3 Indicates number of pixels to shift the display left Value 9bit textmode 256color mode Other modes 0 1 0 0 1 2 n/a 1 2 3 1 2 3 4 n/a 3 4 5 2 4 5 6 n/a 5 6 7 3 6 7 8 n/a 7 8 0 n/a n/a */ break; case 0x14: /* Color Select Register */ if (!IS_VGA_ARCH) { attr(color_select)=0; break; } if (attr(color_select) ^ val) { attr(color_select)=(Bit8u)val; for (Bit8u i=0;i<0x10;i++) { VGA_ATTR_SetPalette(i,vga.attr.palette[i]); } } /* 0-1 If 3C0h index 10h bit 7 is set these 2 bits are used as bits 4-5 of the index into the DAC table. 2-3 These 2 bits are used as bit 6-7 of the index into the DAC table except in 256 color mode. Note: this register does not affect 256 color modes. */ break; default: if (svga.write_p3c0) { svga.write_p3c0(attr(index), val, iolen); break; } LOG(LOG_VGAMISC,LOG_NORMAL)("VGA:ATTR:Write to unkown Index %2X",attr(index)); break; } } } Bitu read_p3c1(Bitu /*port*/,Bitu iolen) { // vga.internal.attrindex=false; switch (attr(index)) { /* Palette */ case 0x00: case 0x01: case 0x02: case 0x03: case 0x04: case 0x05: case 0x06: case 0x07: case 0x08: case 0x09: case 0x0a: case 0x0b: case 0x0c: case 0x0d: case 0x0e: case 0x0f: return attr(palette[attr(index)]); case 0x10: /* Mode Control Register */ return attr(mode_control); case 0x11: /* Overscan Color Register */ return attr(overscan_color); case 0x12: /* Color Plane Enable Register */ return attr(color_plane_enable); case 0x13: /* Horizontal PEL Panning Register */ return attr(horizontal_pel_panning); case 0x14: /* Color Select Register */ return attr(color_select); default: if (svga.read_p3c1) return svga.read_p3c1(attr(index), iolen); LOG(LOG_VGAMISC,LOG_NORMAL)("VGA:ATTR:Read from unkown Index %2X",attr(index)); } return 0; } void VGA_SetupAttr(void) { if (IS_EGAVGA_ARCH) { IO_RegisterWriteHandler(0x3c0,write_p3c0,IO_MB); if (IS_VGA_ARCH) { IO_RegisterReadHandler(0x3c0,read_p3c0,IO_MB); IO_RegisterReadHandler(0x3c1,read_p3c1,IO_MB); } } }