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Reverted ad12a8e: video rendering from screen position -1: so now DHGR vertical column 559 is hidden again (see #555).

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Changed HGR rendering, such that that last video byte (at hpos=64) clears g_nLastColumnPixelNTSC so that the end-of-line off-screen pixel is zero (see #555).
This commit is contained in:
tomcw 2018-06-23 17:50:23 +01:00
parent 9bc7feb37e
commit 47ec7f4355
1 changed files with 9 additions and 1 deletions
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10
source/NTSC.cpp
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@ -1291,6 +1291,14 @@ void updateScreenSingleHires40 (long cycles6502)
if (m & 0x80)
bits = (bits << 1) | g_nLastColumnPixelNTSC;
updatePixels( bits );
// For last hpos && bit6=1: (GH#555)
// * if bit7=0 (no shift) then clear g_nLastColumnPixelNTSC to prevent a 3rd 14M (aka DHGR) pixel being drawn
// . even though this is off-screen, it still has an on-screen affect (making the green dot more white on the screen edge).
// * if bit7=1 (half-dot shift) then also clear g_nLastColumnPixelNTSC
// . not sure if this is correct though
if (g_nVideoClockHorz == (VIDEO_SCANNER_MAX_HORZ-1))
g_nLastColumnPixelNTSC = 0;
}
}
updateVideoScannerHorzEOL();
@ -1631,7 +1639,7 @@ void NTSC_VideoInit( uint8_t* pFramebuffer ) // wsVideoInit
for (int y = 0; y < (VIDEO_SCANNER_Y_DISPLAY*2); y++)
{
uint32_t offset = sizeof(bgra_t) * GetFrameBufferWidth() * ((GetFrameBufferHeight() - 1) - y - GetFrameBufferBorderHeight()) + (sizeof(bgra_t) * GetFrameBufferBorderWidth());
// offset -= sizeof(bgra_t); // GH#555: Start 1 RGBA pixel before frame to account for g_nLastColumnPixelNTSC
// offset -= sizeof(bgra_t); // GH#555: Start 1 RGBA pixel before frame to account for g_nLastColumnPixelNTSC // TC: revert as lose half an HGR pixel on left-edge
g_pScanLines[y] = (bgra_t*) (g_pFramebufferbits + offset);
}