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Delay any video mode change by 1 cycle (#654)

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This commit is contained in:
tomcw
2019-06-15 18:15:00 +01:00
parent 3fbe416424
commit e6e52ffcf4
3 changed files with 27 additions and 5 deletions
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source/NTSC.cpp
+25 -3
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@@ -125,6 +125,9 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
static int g_nHiresPage = 1;
static int g_nTextPage = 1;
static bool g_bDelayVideoMode = false;
static uint32_t g_uNewVideoModeFlags = 0;
// Understanding the Apple II, Timing Generation and the Video Scanner, Pg 3-11
// Vertical Scanning
// Horizontal Scanning
@@ -1852,7 +1855,7 @@ uint16_t NTSC_VideoGetScannerAddress ( const ULONG uExecutedCycles )
const uint16_t currVideoClockHorz = g_nVideoClockHorz;
// Required for ANSI STORY (end credits) vert scrolling mid-scanline mixed mode: DGR80, TEXT80, DGR80
g_nVideoClockHorz -= 2;
g_nVideoClockHorz -= 1;
if ((SHORT)g_nVideoClockHorz < 0)
{
g_nVideoClockHorz += VIDEO_SCANNER_MAX_HORZ;
@@ -1884,8 +1887,15 @@ void NTSC_SetVideoTextMode( int cols )
}
//===========================================================================
void NTSC_SetVideoMode( uint32_t uVideoModeFlags )
void NTSC_SetVideoMode( uint32_t uVideoModeFlags, bool bDelay/*=false*/ )
{
if (bDelay)
{
g_bDelayVideoMode = true;
g_uNewVideoModeFlags = uVideoModeFlags;
return;
}
g_nVideoMixed = uVideoModeFlags & VF_MIXED;
g_nVideoCharSet = VideoGetSWAltCharSet() ? 1 : 0;
@@ -2227,7 +2237,19 @@ static void VideoUpdateCycles( int cyclesLeftToUpdate )
//===========================================================================
void NTSC_VideoUpdateCycles( long cycles6502 )
{
_ASSERT(cycles6502 < VIDEO_SCANNER_6502_CYCLES); // Use NTSC_VideoRedrawWholeScreen() instead
_ASSERT(cycles6502 && cycles6502 < VIDEO_SCANNER_6502_CYCLES); // Use NTSC_VideoRedrawWholeScreen() instead
if (g_bDelayVideoMode)
{
VideoUpdateCycles(1); // Video mode change is delayed by 1 cycle
g_bDelayVideoMode = false;
NTSC_SetVideoMode(g_uNewVideoModeFlags);
cycles6502--;
if (!cycles6502)
return;
}
VideoUpdateCycles(cycles6502);
}