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core vdp, avoid rendering if no changes to RAMs/registers

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mainly benefits 32X in faster/fastest rendering mode, 0-5% saved
This commit is contained in:
kub 2023-04-27 22:18:55 +02:00
parent 0c9c8e4796
commit f9ed944604
6 changed files with 48 additions and 11 deletions
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29
pico/videoport.c
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@ -809,13 +809,17 @@ static inline int InHblank(int offs)
return SekCyclesDone() - Pico.t.m68c_line_start <= offs;
}
static void DrawSync(int skip)
void PicoVideoSync(int skip)
{
int lines = Pico.video.reg[1]&0x08 ? 240 : 224;
int last = Pico.m.scanline - (skip || blankline == Pico.m.scanline);
int last = Pico.m.scanline - ((skip > 0) || blankline == Pico.m.scanline);
if (!(PicoIn.opt & POPT_ALT_RENDERER) && !PicoIn.skipFrame) {
if (last >= lines)
last = lines-1;
else // in active display, need to sync next frame as well
Pico.est.rendstatus |= PDRAW_SYNC_NEXT;
if (last < lines && !(PicoIn.opt & POPT_ALT_RENDERER) &&
!PicoIn.skipFrame && Pico.est.DrawScanline <= last) {
//elprintf(EL_ANOMALY, "sync");
if (blankline >= 0 && blankline < last) {
PicoDrawSync(blankline, 1, 0);
@ -825,6 +829,8 @@ static void DrawSync(int skip)
if (last >= limitsprites)
limitsprites = -1;
}
if (skip >= 0)
Pico.est.rendstatus |= PDRAW_SYNC_NEEDED;
}
PICO_INTERNAL_ASM void PicoVideoWrite(u32 a,unsigned short d)
@ -849,7 +855,11 @@ PICO_INTERNAL_ASM void PicoVideoWrite(u32 a,unsigned short d)
!(pvid->type == 1 && !(pvid->addr&1) && ((pvid->addr^SATaddr)&SATmask) && PicoMem.vram[pvid->addr>>1] == d) &&
!(pvid->type == 3 && PicoMem.cram[(pvid->addr>>1) & 0x3f] == (d & 0xeee)) &&
!(pvid->type == 5 && PicoMem.vsram[(pvid->addr>>1) & 0x3f] == (d & 0x7ff)))
DrawSync(InHblank(48)); // experimentally, Overdrive 2
// the vertical scroll value for this line must be read from VSRAM early,
// since the A/B tile row to be read depends on it. E.g. Skitchin, OD2
// in contrast, CRAM writes would have an immediate effect on the current
// pixel. XXX think about different offset values for different RAM types
PicoVideoSync(InHblank(30));
if (!(PicoIn.opt&POPT_DIS_VDP_FIFO))
{
@ -881,7 +891,7 @@ PICO_INTERNAL_ASM void PicoVideoWrite(u32 a,unsigned short d)
CommandChange(pvid);
// Check for dma:
if (d & 0x80) {
DrawSync(InHblank(93));
PicoVideoSync(InHblank(93));
CommandDma();
}
}
@ -913,9 +923,10 @@ PICO_INTERNAL_ASM void PicoVideoWrite(u32 a,unsigned short d)
}
if (num == 12 && ((pvid->reg[12]^d)&0x01))
PicoVideoFIFOMode(pvid->reg[1]&0x40, d & 1);
if (num <= 18 && pvid->reg[num] != d) // no sync for DMA setup
DrawSync(InHblank(93)); // Toy Story
pvid->reg[num]=d;
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;
switch (num)
{