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Add support for more drive status commands (fixes MSU-MD track looping)

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Report CD_STAT_SEEK during CD_COMM_PLAY latency. Fixes audio delay in some games

Thanks to ekeeke for doing the work in Genesis-Plus-GX to use as reference.
This commit is contained in:
Zakk
2021-02-21 16:56:00 -05:00
parent 5c468c157e
commit 3df02e631c
1 changed files with 40 additions and 9 deletions
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49
support/megacd/megacdd.cpp
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@@ -489,16 +489,47 @@ void cdd_t::CommandExec() {
switch (comm[0]) {
case CD_COMM_IDLE:
stat[0] = this->status;
if (stat[1] == 0x0f)
if (this->latency <= 3)
{
if (!this->latency)
stat[0] = this->status;
if (stat[1] == 0x0f)
{
stat[0] = this->status;
stat[1] = 0x2;
stat[2] = (cdd.index < this->toc.last) ? BCD(this->index + 1) >> 4 : 0xA;
stat[3] = (cdd.index < this->toc.last) ? BCD(this->index + 1) & 0xF : 0xA;
int lba = this->lba + 150;
LBAToMSF(lba, &msf);
stat[1] = 0x0;
stat[2] = BCD(msf.m) >> 4;
stat[3] = BCD(msf.m) & 0xF;
stat[4] = BCD(msf.s) >> 4;
stat[5] = BCD(msf.s) & 0xF;
stat[6] = BCD(msf.f) >> 4;
stat[7] = BCD(msf.f) & 0xF;
stat[8] = this->toc.tracks[this->index].type ? 0x04 : 0x00;
//stat[2] = (cdd.index < this->toc.last) ? BCD(this->index + 1) >> 4 : 0xA;
//stat[3] = (cdd.index < this->toc.last) ? BCD(this->index + 1) & 0xF : 0xA;
} else if (stat[1] == 0x00) {
int lba = this->lba + 150;
LBAToMSF(lba, &msf);
stat[2] = BCD(msf.m) >> 4;
stat[3] = BCD(msf.m) & 0xF;
stat[4] = BCD(msf.s) >> 4;
stat[5] = BCD(msf.s) & 0xF;
stat[6] = BCD(msf.f) >> 4;
stat[7] = BCD(msf.f) & 0xF;
stat[8] = this->toc.tracks[this->index].type ? 0x04 : 0x00;
} else if (stat[1] == 0x01) {
int lba = abs(this->lba - this->toc.tracks[this->index].start);
LBAToMSF(lba,&msf);
stat[2] = BCD(msf.m) >> 4;
stat[3] = BCD(msf.m) & 0xF;
stat[4] = BCD(msf.s) >> 4;
stat[5] = BCD(msf.s) & 0xF;
stat[6] = BCD(msf.f) >> 4;
stat[7] = BCD(msf.f) & 0xF;
stat[8] = this->toc.tracks[this->index].type ? 0x04 : 0x00;
} else if (stat[1] == 0x02) {
stat[2] = (cdd.index < this->toc.last) ? BCD(this->index + 1) >> 4 : 0xA;
stat[3] = (cdd.index < this->toc.last) ? BCD(this->index + 1) & 0xF : 0xA;
}
}
@@ -687,7 +718,7 @@ void cdd_t::CommandExec() {
this->status = CD_STAT_PLAY;
stat[0] = this->status;
stat[0] = CD_STAT_SEEK;
stat[1] = 0xf;
stat[2] = 0;
stat[3] = 0;