Editing Talk:PS2 Emulation
Jump to navigation
Jump to search
The edit can be undone. Please check the comparison below to verify that this is what you want to do, and then publish the changes below to finish undoing the edit.
Latest revision | Your text | ||
Line 489: | Line 489: | ||
After some more work, its either skip seek, or make seek instant. Still a hack, but may give some loading boosts here and there (and break a lot of stuff too). | After some more work, its either skip seek, or make seek instant. Still a hack, but may give some loading boosts here and there (and break a lot of stuff too). | ||
===ps2_netemu command 0x29=== | |||
Something related with read time, maybe seek time. First value is meant to be lower than second value, but this is not requirement. | |||
Code that use it seems to delay some read/seek operation by multiply of first, or second value depending which sector is currently read (or maybe which part of disc actually). Here is code from one of fuctions that use values from that command, keep in mind that "mecha" is just fancy name for cdvd in that emu. | |||
if ((75 * cdvd.CrtSecond + 4500 * cdvd.CrtMinute + cdvd.CrtFrame - 150) >= *(mecha.unk_0x60)) | |||
a = *(cmd_0x29_val_2); | |||
else | |||
a = *(cmd_0x29_val_1); | |||
b = 4835703278458516699; // read https://munroesj52.github.io/vec__int64__ppc_8h.html (search on page for that number). | |||
c = (79800000 * a * b) >> 64; // 0x4C1A6C0 (79800000) is value that lv1 repo key be.clock return. | |||
d = c >> 18; // This and 2 above are generally used as a division by multiply. | |||
e = get_timebase_reg(); | |||
if ( e == 0 ) | |||
{ | |||
do | |||
e = get_timebase_reg(); | |||
while ( e == 0 ); | |||
} | |||
f = e - *(mecha.unk_0x24); | |||
if ( f >= d ) | |||
{ | |||
MECHA_update_status(mecha); | |||
result = unlock_sc06(0x8000LL); | |||
} | |||
else | |||
{ | |||
do | |||
e = get_timebase_reg(); | |||
while ( e == 0 ); | |||
*(mecha.unk_20) = d - f + e; | |||
*mecha.unk_00 = 5; | |||
result = unlock_sc06(0x8000LL); | |||
} | |||
===ps2_netemu command 0x2A=== | ===ps2_netemu command 0x2A=== |