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core vdp, implement partial line blanking

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This commit is contained in:
kub 2023-04-27 22:24:21 +02:00
parent f9ed944604
commit 97232a47c9
2 changed files with 56 additions and 29 deletions
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33
pico/draw.c
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@ -1987,7 +1987,7 @@ static void DrawBlankedLine(int line, int offs, int sh, int bgc)
est->DrawLineDest = (char *)est->DrawLineDest + DrawLineDestIncrement;
}
static void PicoLine(int line, int offs, int sh, int bgc)
static void PicoLine(int line, int offs, int sh, int bgc, int off, int on)
{
struct PicoEState *est = &Pico.est;
int skip = skip_next_line;
@ -2006,8 +2006,17 @@ static void PicoLine(int line, int offs, int sh, int bgc)
// Draw screen:
BackFill(bgc, sh, est);
if (Pico.video.reg[1]&0x40)
if (Pico.video.reg[1]&0x40) {
int width = (Pico.video.reg[12]&1) ? 320 : 256;
DrawDisplay(sh);
// partial line blanking (display on or off inside the line)
if (unlikely(off|on)) {
if (off > 0)
memset(est->HighCol+8 + off, bgc, width-off);
if (on > 0)
memset(est->HighCol+8, bgc, on);
}
}
if (FinalizeLine != NULL)
FinalizeLine(sh, line, est);
@ -2019,7 +2028,7 @@ static void PicoLine(int line, int offs, int sh, int bgc)
est->DrawLineDest = (char *)est->DrawLineDest + DrawLineDestIncrement;
}
void PicoDrawSync(int to, int blank_last_line, int limit_sprites)
void PicoDrawSync(int to, int off, int on)
{
struct PicoEState *est = &Pico.est;
int line, offs = 0;
@ -2035,7 +2044,7 @@ void PicoDrawSync(int to, int blank_last_line, int limit_sprites)
}
if (est->DrawScanline <= to &&
(est->rendstatus & (PDRAW_DIRTY_SPRITES|PDRAW_PARSE_SPRITES)))
ParseSprites(to + 1, limit_sprites);
ParseSprites(to + 1, on);
else if (!(est->rendstatus & PDRAW_SYNC_NEEDED)) {
// nothing has changed in VDP/VRAM and buffer is the same -> no sync needed
int count = to+1 - est->DrawScanline;
@ -2046,14 +2055,22 @@ void PicoDrawSync(int to, int blank_last_line, int limit_sprites)
}
for (line = est->DrawScanline; line < to; line++)
PicoLine(line, offs, sh, bgc);
PicoLine(line, offs, sh, bgc, 0, 0);
// last line
if (line <= to)
{
if (blank_last_line)
DrawBlankedLine(line, offs, sh, bgc);
else PicoLine(line, offs, sh, bgc);
int width2 = (Pico.video.reg[12]&1) ? 160 : 128;
// technically, VDP starts active display output at slot 12
if (unlikely(on|off) && (off >= width2 ||
// hack for timing inaccuracy, if on/off near borders
(off && off <= 24) || (on < width2 && on >= width2-24)))
DrawBlankedLine(line, offs, sh, bgc);
else {
if (on > width2) on = 0; // on, before start of line?
PicoLine(line, offs, sh, bgc, 2*off, 2*on);
}
line++;
}
est->DrawScanline = line;