Emulation/Mesen
1
0
Fork 0
mirror of https://github.com/SourMesen/Mesen.git synced 2025-04-02 10:52:48 -04:00
Code Issues Projects Releases Packages Wiki Activity

Added VBlank suppression flag

Browse source
This commit is contained in:
Souryo 2014-06-21 00:37:27 -04:00
parent 16b6ebeb84
commit 739d1d8f7a
2 changed files with 10 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

16
Core/PPU.cpp
View file

@ -196,6 +196,10 @@ void PPU::UpdateStatusFlag()
((uint8_t)_statusFlags.Sprite0Hit << 6) |
((uint8_t)_statusFlags.VerticalBlank << 7);
_statusFlags.VerticalBlank = false;
if(_scanline == 241 && _cycle == 0) {
_doNotSetVBFlag = true;
}
}
//Taken from http://wiki.nesdev.com/w/index.php/The_skinny_on_NES_scrolling#Wrapping_around
@ -490,16 +494,13 @@ void PPU::CopyOAMData()
void PPU::BeginVBlank()
{
if(_cycle == 1) {
_statusFlags.VerticalBlank = true;
/*if(!_suppressVBlank) {
// We're in VBlank
Ppu_setStatus(p, STATUS_VBLANK_STARTED);
p->cycleCount = 0;
}*/
if(!_doNotSetVBFlag) {
_statusFlags.VerticalBlank = true;
}
if(_flags.VBlank) {
CPU::SetNMIFlag();
}
//Ppu_raster(p);
_doNotSetVBFlag = false;
}
}
@ -507,7 +508,6 @@ void PPU::EndVBlank()
{
if(_cycle == 340) {
_frameCount++;
//std::cout << _frameCount << std::endl;
}
}

2
Core/PPU.h
View file

@ -90,6 +90,8 @@ class PPU : public IMemoryHandler
PPUControlFlags _flags;
PPUStatusFlags _statusFlags;
bool _doNotSetVBFlag = false;
TileInfo _currentTile;
TileInfo _nextTile;
TileInfo _previousTile;