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patch by h-a-l-9000 to exclude the overscan area when dealing with the blanking period. makes the scanline count 400 instead of 415. Should improve scrolling.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2877
This commit is contained in:
Peter Veenstra 2007-06-08 08:26:37 +00:00
parent 44fd176892
commit 9a36682b3a
1 changed files with 11 additions and 7 deletions
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18
src/hardware/vga_misc.cpp
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@ -38,10 +38,9 @@ static Bitu vga_read_p3da(Bitu port,Bitu iolen) {
vga.internal.attrindex=false;
vga.tandy.pcjr_flipflop=false;
double timeInLine=fmod(timeInFrame,vga.draw.delay.htotal);
switch (machine) {
case MCH_HERC:
{
// 3BAh (R): Status Register
// bit 0 Horizontal sync
// 3 Video signal
@ -49,11 +48,13 @@ static Bitu vga_read_p3da(Bitu port,Bitu iolen) {
if(timeInFrame >= vga.draw.delay.vrstart &&
timeInFrame <= vga.draw.delay.vrend)
retval |= 0x80;
double timeInLine=fmod(timeInFrame,vga.draw.delay.htotal);
if(timeInLine >= vga.draw.delay.hrstart &&
timeInLine <= vga.draw.delay.hrend)
retval |= 1;
retval |= 0x10; //Hercules ident
break;
}
default:
// 3DAh (R): Status Register
// bit 0 Horizontal or Vertical blanking
@ -62,12 +63,15 @@ static Bitu vga_read_p3da(Bitu port,Bitu iolen) {
if(timeInFrame >= vga.draw.delay.vrstart &&
timeInFrame <= vga.draw.delay.vrend)
retval |= 8;
if(timeInFrame >= vga.draw.delay.vblkstart &&
timeInFrame <= vga.draw.delay.vblkend)
retval |= 1;
else if(timeInLine >= vga.draw.delay.hblkstart &&
timeInLine <= vga.draw.delay.hblkend)
if(timeInFrame >= vga.draw.delay.vdend)
retval |= 1;
else {
double timeInLine=fmod(timeInFrame,vga.draw.delay.htotal);
if(timeInLine >= (vga.draw.delay.hblkstart) &&
timeInLine <= vga.draw.delay.hblkend){
retval |= 1;
}
}
}
return retval;
}