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vdp, improve save state handling (bg dma)

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This commit is contained in:
kub 2022-01-06 21:46:36 +01:00
parent b1a6586688
commit e45908d734
2 changed files with 31 additions and 14 deletions
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4
pico/pico_int.h
View file

@ -313,8 +313,8 @@ struct PicoVideo
unsigned char hint_cnt;
unsigned char pad2;
unsigned short hv_latch; // latched hvcounter value
signed int fifo_cnt; // pending xfers for current FIFO queue entry
unsigned char pad[0x04];
signed int fifo_cnt; // pending xfers for blocking FIFO queue entries
signed int fifo_bgcnt; // pending xfers for background FIFO queue entries
};
struct PicoMisc

41
pico/videoport.c
View file

@ -1138,9 +1138,18 @@ void PicoVideoSave(void)
int l, x;
// account for all outstanding xfers XXX kludge, entry attr's not saved
pv->fifo_cnt = vf->fifo_cnt;
for (l = vf->fifo_ql, x = vf->fifo_qx + l-1; l > 1; l--, x--)
pv->fifo_cnt += (vf->fifo_queue[x&7] >> 3) << (vf->fifo_queue[x&7] & FQ_BYTE);
pv->fifo_cnt = pv->fifo_bgcnt = 0;
for (l = vf->fifo_ql, x = vf->fifo_qx + l-1; l > 1; l--, x--) {
int cnt = (vf->fifo_queue[x&7] >> 3) << (vf->fifo_queue[x&7] & FQ_BYTE);
if (vf->fifo_queue[x&7] & FQ_BGDMA)
pv->fifo_bgcnt += cnt;
else
pv->fifo_cnt += cnt;
}
if (vf->fifo_ql && (vf->fifo_queue[vf->fifo_qx] & FQ_BGDMA))
pv->fifo_bgcnt += vf->fifo_cnt;
else
pv->fifo_cnt += vf->fifo_cnt;
}
void PicoVideoLoad(void)
@ -1151,23 +1160,31 @@ void PicoVideoLoad(void)
// convert former dma_xfers (why was this in PicoMisc anyway?)
if (Pico.m.dma_xfers) {
pv->status |= SR_DMA;
pv->fifo_cnt = Pico.m.dma_xfers << b;
Pico.m.dma_xfers = 0;
}
// make an entry in the FIFO if there are outstanding transfers
// fake entries in the FIFO if there are outstanding transfers
vf->fifo_ql = vf->fifo_qx = vf->fifo_total = 0;
vf->fifo_cnt = pv->fifo_cnt;
if (pv->fifo_cnt) {
int wc = (pv->fifo_cnt + b) >> b;
pv->status |= PVS_FIFORUN|PVS_CPUWR;
if (!(pv->status & PVS_DMABG))
vf->fifo_total = wc;
if ((pv->status & SR_DMA) && !(pv->status & PVS_DMAFILL))
b |= (pv->status & PVS_DMABG) ? FQ_BGDMA : FQ_FGDMA;
vf->fifo_queue[vf->fifo_qx] = (wc << 3) | b;
vf->fifo_ql = 1;
vf->fifo_total = wc;
vf->fifo_queue[vf->fifo_qx + vf->fifo_ql] = (wc << 3) | b | FQ_FGDMA;
vf->fifo_ql ++;
vf->fifo_cnt = pv->fifo_cnt;
}
if (pv->fifo_bgcnt) {
int wc = pv->fifo_bgcnt;
if (!vf->fifo_ql) {
pv->status |= PVS_DMABG;
vf->fifo_cnt = pv->fifo_bgcnt;
}
vf->fifo_queue[vf->fifo_qx + vf->fifo_ql] = (wc << 3) | FQ_BGDMA;
vf->fifo_ql ++;
}
if (vf->fifo_ql)
pv->status |= SR_DMA;
PicoVideoCacheSAT();
}
// vim:shiftwidth=2:ts=2:expandtab