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A "fix" for the DHGR issue with 559th column not displayed (#557).

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Removes the need for g_nLastColumnPixelNTSC
. instead start from COLOR_PHASE 1 (not 0)
. don't need to shift DHGR 14-bit word
. HGR pixel bits: for b7=0 14-bit word is shifted 1 DHGR dot to the left, then shift in the the dot from the next HGR byte
  - NB. this is no good, since next video byte could be a different video mode
. Also An HCOLOR=2 vertical line at 0th column is only 1 DHGR dot wide due to the b7=0 14-bit word shifted by 1 to the left (I assume this is wrong?)
This commit is contained in:
tomcw 2018-05-23 22:23:37 +01:00
parent 3e7cc361ff
commit 702f6f25e0
1 changed files with 40 additions and 18 deletions
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58
source/NTSC.cpp
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@ -154,10 +154,10 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
static unsigned g_aPixelMaskGR [ 16];
static uint16_t g_aPixelDoubleMaskHGR[128]; // hgrbits -> g_aPixelDoubleMaskHGR: 7-bit mono 280 pixels to 560 pixel doubling
static int g_nLastColumnPixelNTSC;
// static int g_nLastColumnPixelNTSC;
static int g_nColorBurstPixels;
#define INITIAL_COLOR_PHASE 0
#define INITIAL_COLOR_PHASE 1
static int g_nColorPhaseNTSC = INITIAL_COLOR_PHASE;
static int g_nSignalBitsNTSC = 0;
@ -683,7 +683,7 @@ inline void updatePixels( uint16_t bits )
/* #7 of 7 */
g_pFuncUpdateBnWPixel(bits & 1); bits >>= 1;
g_pFuncUpdateBnWPixel(bits & 1);
g_nLastColumnPixelNTSC=bits& 1 ; bits >>= 1;
// g_nLastColumnPixelNTSC=bits& 1 ; bits >>= 1;
}
else
{
@ -708,7 +708,7 @@ inline void updatePixels( uint16_t bits )
/* #7 of 7 */
g_pFuncUpdateHuePixel(bits & 1); bits >>= 1; // 0000 0000 0000 0abc
g_pFuncUpdateHuePixel(bits & 1);
g_nLastColumnPixelNTSC=bits& 1 ; bits >>= 1; // 0000 0000 0000 00ab
// g_nLastColumnPixelNTSC=bits& 1 ; bits >>= 1; // 0000 0000 0000 00ab
}
}
@ -723,6 +723,7 @@ inline void updateVideoScannerHorzEOL()
if (g_nColorBurstPixels < 2)
{
// NOTE: This writes out-of-bounds for a 560x384 framebuffer
// g_pFuncUpdateBnWPixel(g_nLastColumnPixelNTSC);
g_pFuncUpdateBnWPixel(0);
g_pFuncUpdateBnWPixel(0);
g_pFuncUpdateBnWPixel(0);
@ -731,7 +732,8 @@ inline void updateVideoScannerHorzEOL()
else
{
// NOTE: This writes out-of-bounds for a 560x384 framebuffer
g_pFuncUpdateHuePixel(g_nLastColumnPixelNTSC); // BUGFIX: ARCHON: green fringe on end of line
// g_pFuncUpdateHuePixel(g_nLastColumnPixelNTSC); // BUGFIX: ARCHON: green fringe on end of line
g_pFuncUpdateBnWPixel(0);
g_pFuncUpdateHuePixel(0);
g_pFuncUpdateHuePixel(0);
g_pFuncUpdateHuePixel(0);
@ -759,7 +761,7 @@ inline void updateVideoScannerAddress()
{
g_pVideoAddress = g_nVideoClockVert<VIDEO_SCANNER_Y_DISPLAY ? g_pScanLines[2*g_nVideoClockVert] : g_pScanLines[0];
g_nColorPhaseNTSC = INITIAL_COLOR_PHASE;
g_nLastColumnPixelNTSC = 0;
// g_nLastColumnPixelNTSC = 0;
g_nSignalBitsNTSC = 0;
}
@ -1043,12 +1045,19 @@ static void initPixelDoubleMasks (void)
0x100 -> 0x4000
*/
for (uint8_t byte = 0; byte < 0x80; byte++ ) // Optimization: hgrbits second 128 entries are mirror of first 128
{
for (uint8_t bits = 0; bits < 7; bits++ ) // high bit = half pixel shift; pre-optimization: bits < 8
if (byte & (1 << bits)) // pow2 mask
if (byte & (1 << bits))
g_aPixelDoubleMaskHGR[byte] |= 3 << (bits*2);
// g_aPixelDoubleMaskHGR[byte] >>= 1;
}
for ( uint16_t color = 0; color < 16; color++ )
g_aPixelMaskGR[ color ] = (color << 12) | (color << 8) | (color << 4) | (color << 0);
{
uint16_t bits = (color << 12) | (color << 8) | (color << 4) | (color << 0);
bits = (bits >> 1) | (bits << 15);
g_aPixelMaskGR[ color ] = bits;
}
}
//===========================================================================
@ -1154,8 +1163,6 @@ void updateScreenDoubleHires40 (long cycles6502) // wsUpdateVideoHires0
//===========================================================================
void updateScreenDoubleHires80 (long cycles6502 ) // wsUpdateVideoDblHires
{
uint16_t bits;
if (g_nVideoMixed && g_nVideoClockVert >= VIDEO_SCANNER_Y_MIXED)
{
g_pFuncUpdateTextScreen( cycles6502 );
@ -1180,10 +1187,11 @@ void updateScreenDoubleHires80 (long cycles6502 ) // wsUpdateVideoDblHires
uint8_t m = pMain[0];
uint8_t a = pAux [0];
bits = ((m & 0x7f) << 7) | (a & 0x7f);
bits = (bits << 1) | g_nLastColumnPixelNTSC; // TC: needed else colours are wrong phase
uint16_t bits = ((m & 0x7f) << 7) | (a & 0x7f);
// bits = (bits << 1) | g_nLastColumnPixelNTSC;
updatePixels( bits );
g_nLastColumnPixelNTSC = (bits >> 14) & 3;
// g_nLastColumnPixelNTSC = (bits >> 14) & 1;
}
}
updateVideoScannerHorzEOL();
@ -1255,9 +1263,10 @@ void updateScreenDoubleLores80 (long cycles6502) // wsUpdateVideoDblLores
uint16_t main = lo >> (((1 - (g_nVideoClockHorz & 1)) * 2) + 3);
uint16_t aux = hi >> (((1 - (g_nVideoClockHorz & 1)) * 2) + 3);
uint16_t bits = (main << 7) | (aux & 0x7f);
updatePixels( bits );
g_nLastColumnPixelNTSC = (bits >> 14) & 3;
// bits = (bits << 1) | g_nLastColumnPixelNTSC;
updatePixels( bits );
// g_nLastColumnPixelNTSC = (bits >> 14) & 1;
}
}
updateVideoScannerHorzEOL();
@ -1289,8 +1298,14 @@ void updateScreenSingleHires40 (long cycles6502)
uint8_t *pMain = MemGetMainPtr(addr);
uint8_t m = pMain[0];
uint16_t bits = g_aPixelDoubleMaskHGR[m & 0x7F]; // Optimization: hgrbits second 128 entries are mirror of first 128
if (m & 0x80)
bits = (bits << 1) | g_nLastColumnPixelNTSC;
if ((m & 0x80) == 0)
{
bits >>= 1;
if (g_nVideoClockHorz != VIDEO_SCANNER_MAX_HORZ-1)
bits |= (pMain[1] & 1) << 13;
}
updatePixels( bits );
}
}
@ -1350,6 +1365,7 @@ void updateScreenText40 (long cycles6502)
uint8_t m = pMain[0];
uint8_t c = getCharSetBits(m);
uint16_t bits = g_aPixelDoubleMaskHGR[c & 0x7F]; // Optimization: hgrbits second 128 entries are mirror of first 128
bits >>= 1;
if (0 == g_nVideoCharSet && 0x40 == (m & 0xC0)) // Flash only if mousetext not active
bits ^= g_nTextFlashMask;
@ -1394,7 +1410,9 @@ void updateScreenText80 (long cycles6502)
aux ^= g_nTextFlashMask;
uint16_t bits = (main << 7) | aux;
// bits = (bits << 1) | g_nLastColumnPixelNTSC;
updatePixels( bits );
// g_nLastColumnPixelNTSC = (bits >> 14) & 1;
}
}
updateVideoScannerHorzEOL();
@ -1628,7 +1646,11 @@ void NTSC_VideoInit( uint8_t* pFramebuffer ) // wsVideoInit
updateMonochromeTables( 0xFF, 0xFF, 0xFF );
for (int y = 0; y < (VIDEO_SCANNER_Y_DISPLAY*2); y++)
g_pScanLines[y] = (bgra_t*)(g_pFramebufferbits + sizeof(bgra_t) * GetFrameBufferWidth() * ((GetFrameBufferHeight() - 1) - y - GetFrameBufferBorderHeight()) + (sizeof(bgra_t) * GetFrameBufferBorderWidth()));
{
uint32_t offset = sizeof(bgra_t) * GetFrameBufferWidth() * ((GetFrameBufferHeight() - 1) - y - GetFrameBufferBorderHeight()) + (sizeof(bgra_t) * GetFrameBufferBorderWidth());
// offset -= sizeof(bgra_t); // Start 1 RGBA pixel before frame to account for g_nLastColumnPixelNTSC
g_pScanLines[y] = (bgra_t*) (g_pFramebufferbits + offset);
}
g_pVideoAddress = g_pScanLines[0];