/*
* Copyright (C) 2002-2010 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.
*/
/* $Id: int10_put_pixel.cpp,v 1.23 2009-05-27 09:15:42 qbix79 Exp $ */
#include "dosbox.h"
#include "mem.h"
#include "inout.h"
#include "int10.h"
static Bit8u cga_masks[4]={0x3f,0xcf,0xf3,0xfc};
static Bit8u cga_masks2[8]={0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe};
void INT10_PutPixel(Bit16u x,Bit16u y,Bit8u page,Bit8u color) {
static bool putpixelwarned = false;
switch (CurMode->type) {
case M_CGA4:
{
if (real_readb(BIOSMEM_SEG,BIOSMEM_CURRENT_MODE)<=5) {
Bit16u off=(y>>1)*80+(x>>2);
if (y&1) off+=8*1024;
Bit8u old=real_readb(0xb800,off);
if (color & 0x80) {
color&=3;
old^=color << (2*(3-(x&3)));
} else {
old=(old&cga_masks[x&3])|((color&3) << (2*(3-(x&3))));
}
real_writeb(0xb800,off,old);
} else {
Bit16u off=(y>>2)*160+((x>>2)&(~1));
off+=(8*1024) * (y & 3);
Bit16u old=real_readw(0xb800,off);
if (color & 0x80) {
old^=(color&1) << (7-(x&7));
old^=((color&2)>>1) << ((7-(x&7))+8);
} else {
old=(old&(~(0x101<<(7-(x&7))))) | ((color&1) << (7-(x&7))) | (((color&2)>>1) << ((7-(x&7))+8));
}
real_writew(0xb800,off,old);
}
}
break;
case M_CGA2:
{
Bit16u off=(y>>1)*80+(x>>3);
if (y&1) off+=8*1024;
Bit8u old=real_readb(0xb800,off);
if (color & 0x80) {
color&=1;
old^=color << ((7-(x&7)));
} else {
old=(old&cga_masks2[x&7])|((color&1) << ((7-(x&7))));
}
real_writeb(0xb800,off,old);
}
break;
case M_TANDY16:
{
IO_Write(0x3d4,0x09);
Bit8u scanlines_m1=IO_Read(0x3d5);
Bit16u off=(y>>((scanlines_m1==1)?1:2))*(CurMode->swidth>>1)+(x>>1);
off+=(8*1024) * (y & scanlines_m1);
Bit8u old=real_readb(0xb800,off);
Bit8u p[2];
p[1] = (old >> 4) & 0xf;
p[0] = old & 0xf;
Bitu ind = 1-(x & 0x1);
if (color & 0x80) {
p[ind]^=(color & 0x7f);
} else {
p[ind]=color;
}
old = (p[1] << 4) | p[0];
real_writeb(0xb800,off,old);
}
break;
case M_LIN4:
if ((machine!=MCH_VGA) || (svgaCard!=SVGA_TsengET4K) ||
(CurMode->swidth>800)) {
// the ET4000 BIOS supports text output in 800x600 SVGA (Gateway 2)
// putpixel warining?
break;
}
case M_EGA:
{
/* Set the correct bitmask for the pixel position */
IO_Write(0x3ce,0x8);Bit8u mask=128>>(x&7);IO_Write(0x3cf,mask);
/* Set the color to set/reset register */
IO_Write(0x3ce,0x0);IO_Write(0x3cf,color);
/* Enable all the set/resets */
IO_Write(0x3ce,0x1);IO_Write(0x3cf,0xf);
/* test for xorring */
if (color & 0x80) { IO_Write(0x3ce,0x3);IO_Write(0x3cf,0x18); }
//Perhaps also set mode 1
/* Calculate where the pixel is in video memory */
if (CurMode->plength!=(Bitu)real_readw(BIOSMEM_SEG,BIOSMEM_PAGE_SIZE))
LOG(LOG_INT10,LOG_ERROR)("PutPixel_EGA_p: %x!=%x",CurMode->plength,real_readw(BIOSMEM_SEG,BIOSMEM_PAGE_SIZE));
if (CurMode->swidth!=(Bitu)real_readw(BIOSMEM_SEG,BIOSMEM_NB_COLS)*8)
LOG(LOG_INT10,LOG_ERROR)("PutPixel_EGA_w: %x!=%x",CurMode->swidth,real_readw(BIOSMEM_SEG,BIOSMEM_NB_COLS)*8);
PhysPt off=0xa0000+real_readw(BIOSMEM_SEG,BIOSMEM_PAGE_SIZE)*page+
((y*real_readw(BIOSMEM_SEG,BIOSMEM_NB_COLS)*8+x)>>3);
/* Bitmask and set/reset should do the rest */
mem_readb(off);
mem_writeb(off,0xff);
/* Restore bitmask */
IO_Write(0x3ce,0x8);IO_Write(0x3cf,0xff);
IO_Write(0x3ce,0x1);IO_Write(0x3cf,0);
/* Restore write operating if changed */
if (color & 0x80) { IO_Write(0x3ce,0x3);IO_Write(0x3cf,0x0); }
break;
}
case M_VGA:
mem_writeb(PhysMake(0xa000,y*320+x),color);
break;
case M_LIN8: {
if (CurMode->swidth!=(Bitu)real_readw(BIOSMEM_SEG,BIOSMEM_NB_COLS)*8)
LOG(LOG_INT10,LOG_ERROR)("PutPixel_VGA_w: %x!=%x",CurMode->swidth,real_readw(BIOSMEM_SEG,BIOSMEM_NB_COLS)*8);
PhysPt off=S3_LFB_BASE+y*real_readw(BIOSMEM_SEG,BIOSMEM_NB_COLS)*8+x;
mem_writeb(off,color);
break;
}
default:
if(GCC_UNLIKELY(!putpixelwarned)) {
putpixelwarned = true;
LOG(LOG_INT10,LOG_ERROR)("PutPixel unhandled mode type %d",CurMode->type);
}
break;
}
}
void INT10_GetPixel(Bit16u x,Bit16u y,Bit8u page,Bit8u * color) {
switch (CurMode->type) {
case M_CGA4:
{
Bit16u off=(y>>1)*80+(x>>2);
if (y&1) off+=8*1024;
Bit8u val=real_readb(0xb800,off);
*color=(val>>(((3-(x&3)))*2)) & 3 ;
}
break;
case M_CGA2:
{
Bit16u off=(y>>1)*80+(x>>3);
if (y&1) off+=8*1024;
Bit8u val=real_readb(0xb800,off);
*color=(val>>(((7-(x&7))))) & 1 ;
}
break;
case M_EGA:
{
/* Calculate where the pixel is in video memory */
if (CurMode->plength!=(Bitu)real_readw(BIOSMEM_SEG,BIOSMEM_PAGE_SIZE))
LOG(LOG_INT10,LOG_ERROR)("GetPixel_EGA_p: %x!=%x",CurMode->plength,real_readw(BIOSMEM_SEG,BIOSMEM_PAGE_SIZE));
if (CurMode->swidth!=(Bitu)real_readw(BIOSMEM_SEG,BIOSMEM_NB_COLS)*8)
LOG(LOG_INT10,LOG_ERROR)("GetPixel_EGA_w: %x!=%x",CurMode->swidth,real_readw(BIOSMEM_SEG,BIOSMEM_NB_COLS)*8);
PhysPt off=0xa0000+real_readw(BIOSMEM_SEG,BIOSMEM_PAGE_SIZE)*page+
((y*real_readw(BIOSMEM_SEG,BIOSMEM_NB_COLS)*8+x)>>3);
Bitu shift=7-(x & 7);
/* Set the read map */
*color=0;
IO_Write(0x3ce,0x4);IO_Write(0x3cf,0);
*color|=((mem_readb(off)>>shift) & 1) << 0;
IO_Write(0x3ce,0x4);IO_Write(0x3cf,1);
*color|=((mem_readb(off)>>shift) & 1) << 1;
IO_Write(0x3ce,0x4);IO_Write(0x3cf,2);
*color|=((mem_readb(off)>>shift) & 1) << 2;
IO_Write(0x3ce,0x4);IO_Write(0x3cf,3);
*color|=((mem_readb(off)>>shift) & 1) << 3;
break;
}
case M_VGA:
*color=mem_readb(PhysMake(0xa000,320*y+x));
break;
case M_LIN8: {
if (CurMode->swidth!=(Bitu)real_readw(BIOSMEM_SEG,BIOSMEM_NB_COLS)*8)
LOG(LOG_INT10,LOG_ERROR)("GetPixel_VGA_w: %x!=%x",CurMode->swidth,real_readw(BIOSMEM_SEG,BIOSMEM_NB_COLS)*8);
PhysPt off=S3_LFB_BASE+y*real_readw(BIOSMEM_SEG,BIOSMEM_NB_COLS)*8+x;
*color = mem_readb(off);
break;
}
default:
LOG(LOG_INT10,LOG_ERROR)("GetPixel unhandled mode type %d",CurMode->type);
break;
}
}