RaySollium99/picodrive
1
0
Fork 0
mirror of https://github.com/RaySollium99/picodrive.git synced 2025-09-06 07:38:05 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

core vdp, implement partial line blanking

Browse source
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
Download patch file Download diff file Expand all files Collapse all files

52
pico/videoport.c
View file

@ -138,10 +138,11 @@ void PicoVideoInit(void)
}
static int blankline; // display disabled for this line
static int limitsprites;
static int linedisabled; // display disabled on this line
static int lineenabled; // display enabled on this line
static int lineoffset; // offset at which dis/enable took place
u32 SATaddr, SATmask; // VRAM addr of sprite attribute table
u32 SATaddr, SATmask; // VRAM addr of sprite attribute table
int (*PicoDmaHook)(u32 source, int len, unsigned short **base, u32 *mask) = NULL;
@ -811,8 +812,9 @@ static inline int InHblank(int offs)
void PicoVideoSync(int skip)
{
struct VdpFIFO *vf = &VdpFIFO;
int lines = Pico.video.reg[1]&0x08 ? 240 : 224;
int last = Pico.m.scanline - ((skip > 0) || blankline == Pico.m.scanline);
int last = Pico.m.scanline - (skip > 0);
if (!(PicoIn.opt & POPT_ALT_RENDERER) && !PicoIn.skipFrame) {
if (last >= lines)
@ -821,13 +823,22 @@ void PicoVideoSync(int skip)
Pico.est.rendstatus |= PDRAW_SYNC_NEXT;
//elprintf(EL_ANOMALY, "sync");
if (blankline >= 0 && blankline < last) {
PicoDrawSync(blankline, 1, 0);
blankline = -1;
if (unlikely(linedisabled >= 0 && linedisabled <= last)) {
if (Pico.est.DrawScanline <= linedisabled) {
int sl = vf->fifo_hcounts[lineoffset/clkdiv];
PicoDrawSync(linedisabled, sl ? sl : 1, 0);
}
linedisabled = -1;
}
PicoDrawSync(last, 0, last == limitsprites);
if (last >= limitsprites)
limitsprites = -1;
if (unlikely(lineenabled >= 0 && lineenabled <= last)) {
if (Pico.est.DrawScanline <= lineenabled) {
int sl = vf->fifo_hcounts[lineoffset/clkdiv];
PicoDrawSync(lineenabled, 0, sl ? sl : 1);
}
lineenabled = -1;
}
if (Pico.est.DrawScanline <= last)
PicoDrawSync(last, 0, 0);
}
if (skip >= 0)
Pico.est.rendstatus |= PDRAW_SYNC_NEEDED;
@ -911,19 +922,18 @@ PICO_INTERNAL_ASM void PicoVideoWrite(u32 a,unsigned short d)
d &= 0xff;
if (num == 0 && !(pvid->reg[0]&2) && (d&2))
pvid->hv_latch = PicoVideoRead(0x08);
if (num == 1 && ((pvid->reg[1]^d)&0x40)) {
PicoVideoFIFOMode(d & 0x40, pvid->reg[12]&1);
// handle line blanking before line rendering
if (InHblank(93)) {
// sprite rendering is limited if display is disabled and reenabled
// in HBLANK of the same scanline (Overdrive)
limitsprites = (d&0x40) && blankline == Pico.m.scanline ? Pico.m.scanline : -1;
blankline = (d&0x40) ? -1 : Pico.m.scanline;
}
}
if (num == 12 && ((pvid->reg[12]^d)&0x01))
PicoVideoFIFOMode(pvid->reg[1]&0x40, d & 1);
if (((1<<num) & 0x738ff) && pvid->reg[num] != d)
if (num == 1 && ((pvid->reg[1]^d)&0x40)) {
PicoVideoFIFOMode(d & 0x40, pvid->reg[12]&1);
// handle line blanking before line rendering. Only the last switch
// before the 1st sync for other reasons is honoured.
PicoVideoSync(1);
lineenabled = (d&0x40) ? Pico.m.scanline : -1;
linedisabled = (d&0x40) ? -1 : Pico.m.scanline;
lineoffset = SekCyclesDone() - Pico.t.m68c_line_start;
} else if (((1<<num) & 0x738ff) && pvid->reg[num] != d)
// VDP regs 0-7,11-13,16-18 influence rendering, ignore all others
PicoVideoSync(InHblank(93)); // Toy Story
pvid->reg[num] = d;