2009-05-02 23:03:37 +02:00
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/*
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* Copyright (C) 2002 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 "dosbox.h"
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#include "mem.h"
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#include "inout.h"
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#include "int10.h"
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union VGA_Memory {
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Bit8u linear[64*1024*4];
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Bit8u paged[64*1024][4];
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};
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extern VGA_Memory vga_mem;
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static Bit8u cga_masks[4]={~192,~48,~12,~3};
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void INT10_PutPixel(Bit16u x,Bit16u y,Bit8u page,Bit8u color) {
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VGAMODES * curmode=GetCurrentMode();
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switch (curmode->memmodel) {
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case CGA:
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{
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Bit16u off=(y>>1)*80+(x>>2);
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if (y&1) off+=8*1024;
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Bit8u old=real_readb(0xb800,off);
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old=old&cga_masks[x&3]|((color&3) << (2*(3-(x&3))));
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real_writeb(0xb800,off,old);
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}
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break;
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case PLANAR4:
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{
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/* Set the correct bitmask for the pixel position */
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IO_Write(0x3ce,0x8);Bit8u mask=128>>(x&7);IO_Write(0x3cf,mask);
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/* Set the color to set/reset register */
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IO_Write(0x3ce,0x0);IO_Write(0x3cf,color);
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/* Enable all the set/resets */
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IO_Write(0x3ce,0x1);IO_Write(0x3cf,0xf);
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//Perhaps also set mode 1
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/* Calculate where the pixel is in video memory */
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Bit16u base_address=((((curmode->sheight*curmode->swidth)>>3)|0xff)+1)*page;
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2009-05-02 23:12:18 +02:00
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PhysPt off=0xa0000+base_address+((y*curmode->swidth+x)>>3);
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2009-05-02 23:03:37 +02:00
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/* Bitmask and set/reset should do the rest */
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mem_readb(off);
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mem_writeb(off,0xff);
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break;
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}
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case CTEXT:
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case MTEXT:
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case PLANAR1:
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case PLANAR2:
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case LINEAR8:
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default:
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LOG_WARN("INT10:PutPixel Unhanled memory model");
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break;
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}
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}
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void INT10_GetPixel(Bit16u x,Bit16u y,Bit8u page,Bit8u * color) {
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VGAMODES * curmode=GetCurrentMode();
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switch (curmode->memmodel) {
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case CGA:
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{
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Bit16u off=(y>>1)*80+(x>>2);
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if (y&1) off+=8*1024;
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Bit8u val=real_readb(0xb800,off);
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*color=val<<((x&3)*2);
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}
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break;
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default:
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LOG_WARN("INT10:GetPixel Unhanled memory model");
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break;
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}
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}
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