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Added CGA and EGA putpixel with xorring and VGA putpixel.

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Also added a getpixel for CGA,EGA and VGA.


Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@306
This commit is contained in:
Sjoerd van der Berg 2002-09-28 21:29:57 +00:00
parent 2d1ccb9048
commit 619a691310
1 changed files with 42 additions and 13 deletions
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55
src/ints/int10_put_pixel.cpp
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@ -21,12 +21,6 @@
#include "inout.h"
#include "int10.h"
union VGA_Memory {
Bit8u linear[64*1024*4];
Bit8u paged[64*1024][4];
};
extern VGA_Memory vga_mem;
static Bit8u cga_masks[4]={~192,~48,~12,~3};
void INT10_PutPixel(Bit16u x,Bit16u y,Bit8u page,Bit8u color) {
@ -39,7 +33,12 @@ void INT10_PutPixel(Bit16u x,Bit16u y,Bit8u page,Bit8u color) {
Bit16u off=(y>>1)*80+(x>>2);
if (y&1) off+=8*1024;
Bit8u old=real_readb(0xb800,off);
old=old&cga_masks[x&3]|((color&3) << (2*(3-(x&3))));
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);
}
break;
@ -51,20 +50,27 @@ void INT10_PutPixel(Bit16u x,Bit16u y,Bit8u page,Bit8u color) {
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 */
Bit16u base_address=((((curmode->sheight*curmode->swidth)>>3)|0xff)+1)*page;
PhysPt off=0xa0000+base_address+((y*curmode->swidth+x)>>3);
PhysPt off=0xa0000+curmode->slength*page+((y*curmode->swidth+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);
/* Restore write operating if changed */
if (color & 0x80) { IO_Write(0x3ce,0x3);IO_Write(0x3cf,0x0); }
break;
}
case CTEXT:
case MTEXT:
case LINEAR8:
mem_writeb(Real2Phys(RealMake(0xa000,y*320+x)),color);
break;
case PLANAR1:
case PLANAR2:
case LINEAR8:
case CTEXT:
case MTEXT:
default:
LOG_WARN("INT10:PutPixel Unhanled memory model");
break;
@ -72,7 +78,6 @@ void INT10_PutPixel(Bit16u x,Bit16u y,Bit8u page,Bit8u color) {
}
void INT10_GetPixel(Bit16u x,Bit16u y,Bit8u page,Bit8u * color) {
VGAMODES * curmode=GetCurrentMode();
switch (curmode->memmodel) {
case CGA:
@ -83,6 +88,30 @@ void INT10_GetPixel(Bit16u x,Bit16u y,Bit8u page,Bit8u * color) {
*color=val<<((x&3)*2);
}
break;
case PLANAR4:
{
/* Calculate where the pixel is in video memory */
PhysPt off=0xa0000+curmode->slength*page+((y*curmode->swidth+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 LINEAR8:
*color=mem_readb(PhysMake(0xa000,320*y+x));
break;
case PLANAR1:
case PLANAR2:
case CTEXT:
case MTEXT:
default:
LOG_WARN("INT10:GetPixel Unhanled memory model");
break;