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vdp fifo, tentative fix for hanging DMA

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kub 2020-09-17 23:47:34 +02:00
parent 352479001c
commit dc56ca2ede
1 changed files with 2 additions and 2 deletions
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4
pico/videoport.c
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@ -64,7 +64,7 @@ static struct VdpFIFO { // XXX this must go into save file!
// queued FIFO transfers, ...x = index, ...l = queue length // queued FIFO transfers, ...x = index, ...l = queue length
// each entry has 2 values: [n]>>3 = #writes, [n]&7 = flags (FQ_*) // each entry has 2 values: [n]>>3 = #writes, [n]&7 = flags (FQ_*)
unsigned int fifo_queue[8], fifo_qx, fifo_ql; unsigned int fifo_queue[8], fifo_qx, fifo_ql;
unsigned int fifo_total; // total# of pending FIFO entries (w/o BGDMA) int fifo_total; // total# of pending FIFO entries (w/o BGDMA)
unsigned short fifo_slot; // last executed slot in current scanline unsigned short fifo_slot; // last executed slot in current scanline
unsigned short fifo_maxslot;// #slots in scanline unsigned short fifo_maxslot;// #slots in scanline
@ -85,7 +85,7 @@ static __inline int AdvanceFIFOEntry(struct VdpFIFO *vf, struct PicoVideo *pv, i
if (l > cnt) if (l > cnt)
l = cnt; l = cnt;
if (!(vf->fifo_queue[vf->fifo_qx] & FQ_BGDMA)) if (!(vf->fifo_queue[vf->fifo_qx] & FQ_BGDMA))
vf->fifo_total -= ((cnt & b) + l) >> b; if ((vf->fifo_total -= ((cnt & b) + l) >> b) < 0) vf->fifo_total = 0;
cnt -= l; cnt -= l;
// if entry has been processed... // if entry has been processed...