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vdp fifo, bugfix

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This commit is contained in:
kub 2020-04-22 21:51:35 +02:00
parent 324bd6852e
commit 2a2e0f890a
1 changed files with 4 additions and 2 deletions
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6
pico/videoport.c
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@ -91,8 +91,10 @@ static __inline int AdvanceFIFOEntry(struct VdpFIFO *vf, struct PicoVideo *pv, i
// if entry has been processed...
if (cnt == 0) {
// remove entry from FIFO
if (vf->fifo_ql)
if (vf->fifo_ql) {
vf->fifo_queue[vf->fifo_qx] = 0;
vf->fifo_qx = (vf->fifo_qx+1) & 7, vf->fifo_ql --;
}
// start processing for next entry if there is one
if (vf->fifo_ql) {
b = vf->fifo_queue[vf->fifo_qx] & FQ_BYTE;
@ -230,7 +232,7 @@ int PicoVideoFIFOWrite(int count, int flags, unsigned sr_mask,unsigned sr_flags)
if (count && vf->fifo_ql < 8) {
// determine queue position for entry
int x = (vf->fifo_qx + vf->fifo_ql - 1) & 7;
if (unlikely(vf->fifo_ql && (vf->fifo_queue[x] & FQ_BGDMA))) {
if (unlikely(vf->fifo_queue[x] & FQ_BGDMA)) {
// CPU FIFO writes have priority over a background DMA Fill/Copy
// XXX if interrupting a DMA fill, fill data changes
if (x == vf->fifo_qx) { // overtaking to queue head?