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Slight improvement of the description of NUSIZ during draw.

This commit is contained in:
Christian Speckner 2017-01-21 00:45:00 +01:00
parent d521a230bd
commit 6070291769
2 changed files with 11 additions and 3 deletions
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13
src/emucore/tia/Player.cxx
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@ -40,6 +40,7 @@ void Player::reset()
myCounter = 0;
myIsMoving = false;
myWidth = 8;
myEffectiveWidth = 8;
myIsRendering = false;
myRenderCounter = 0;
myPatternOld = 0;
@ -83,8 +84,13 @@ void Player::nusiz(uInt8 value)
myDecodes = DrawCounterDecodes::get().playerDecodes()[masked];
if (myIsRendering && myRenderCounter >= myWidth)
myIsRendering = false;
// This is an incomplete description of the effects seen in issues #87 and #82. More investigation
// is required for a complete description (#63)
if (myIsRendering && myRenderCounter >= (8 - myWidth - 2) && oldWidth == 8 && myWidth != oldWidth) {
myEffectiveWidth = 8;
} else {
myEffectiveWidth = oldWidth;
}
// NUSIZ during decode seems to affect the decoding logic. The rods in Meltdown
// are highly sensitive to this effect, and this seems to model it adequately.
@ -201,8 +207,9 @@ void Player::tick()
{
if (myDecodes[myCounter]) {
myIsRendering = true;
myEffectiveWidth = myWidth;
myRenderCounter = myWidth > 8 ? Count::renderCounterOffsetWide : Count::renderCounterOffset;
} else if (myIsRendering && ++myRenderCounter >= myWidth) {
} else if (myIsRendering && ++myRenderCounter >= myEffectiveWidth) {
myIsRendering = false;
}

1
src/emucore/tia/Player.hxx
View File

@ -103,6 +103,7 @@ class Player : public Serializable
uInt8 myCounter;
bool myIsMoving;
uInt8 myWidth;
uInt8 myEffectiveWidth;
bool myIsRendering;
Int8 myRenderCounter;