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Fix video tearing by only updating during the Apple II VBL (#711)

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tomcw
2019-11-03 15:05:28 +00:00
parent d92eca5068
commit 4ad0923399
4 changed files with 14 additions and 3 deletions
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source/NTSC.cpp
+6 -2
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@@ -2003,8 +2003,12 @@ void NTSC_VideoInit( uint8_t* pFramebuffer ) // wsVideoInit
//===========================================================================
void NTSC_VideoReinitialize( DWORD cyclesThisFrame, bool bInitVideoScannerAddress )
{
_ASSERT(cyclesThisFrame < g_videoScanner6502Cycles);
if (cyclesThisFrame >= g_videoScanner6502Cycles) cyclesThisFrame = 0; // error
if (cyclesThisFrame >= g_videoScanner6502Cycles)
{
// Possible, since ContinueExecution() loop waits until: cycles > g_videoScanner6502Cycles && VBL
cyclesThisFrame %= g_videoScanner6502Cycles;
}
g_nVideoClockVert = (uint16_t) (cyclesThisFrame / VIDEO_SCANNER_MAX_HORZ);
g_nVideoClockHorz = cyclesThisFrame % VIDEO_SCANNER_MAX_HORZ;