piwalker/melonDS
1
0
Fork 0
mirror of https://github.com/melonDS-emu/melonDS.git synced 2025-07-22 22:01:06 -06:00
Code Issues Packages Projects Releases Wiki Activity

redesign main emu loop to use timestamps instead of being a trainwreck

Browse Source 
* cleaner code
* faster in some cases
* more accurate (on-demand compensation for timers and GPU)
* less prone to desyncs
* overall betterer
This commit is contained in:
StapleButter
2019-01-05 05:28:58 +01:00
parent 90f2c0834e
commit 669247e8c8
14 changed files with 360 additions and 412 deletions
Download Patch File Download Diff File Expand all files Collapse all files

85
src/ARM.cpp
View File

@ -61,8 +61,6 @@ ARM::ARM(u32 num)
{
// well uh
Num = num;
SetClockShift(0); // safe default
}
ARM::~ARM()
@ -110,7 +108,7 @@ void ARM::DoSavestate(Savestate* file)
file->Section((char*)(Num ? "ARM7" : "ARM9"));
file->Var32((u32*)&Cycles);
file->Var32((u32*)&CyclesToRun);
//file->Var32((u32*)&CyclesToRun);
file->Var32(&Halted);
file->VarArray(R, 16*sizeof(u32));
@ -450,7 +448,7 @@ void ARMv5::DataAbort()
JumpTo(ExceptionBase + 0x10);
}
s32 ARMv5::Execute()
void ARMv5::Execute()
{
if (Halted)
{
@ -466,19 +464,12 @@ s32 ARMv5::Execute()
}
else
{
Cycles = CyclesToRun;
#ifdef DEBUG_CHECK_DESYNC
NDS::dbg_CyclesARM9 += (CyclesToRun >> ClockShift);
#endif // DEBUG_CHECK_DESYNC
//NDS::RunTightTimers(0, CyclesToRun >> ClockShift);
return Cycles;
NDS::ARM9Timestamp = NDS::ARM9Target;
return;
}
}
Cycles = 0;
s32 lastcycles = 0;
while (Cycles < CyclesToRun)
while (NDS::ARM9Timestamp < NDS::ARM9Target)
{
if (CPSR & 0x20) // THUMB
{
@ -515,19 +506,12 @@ s32 ARMv5::Execute()
AddCycles_C();
}
//s32 diff = Cycles - lastcycles;
//NDS::RunTightTimers(0, diff >> ClockShift);
//lastcycles = Cycles - (diff & ClockDiffMask);
// TODO optimize this shit!!!
if (Halted)
{
if (Halted == 1 && Cycles < CyclesToRun)
if (Halted == 1 && NDS::ARM9Timestamp < NDS::ARM9Target)
{
//s32 diff = CyclesToRun - Cycles;
Cycles = CyclesToRun;
//NDS::RunTightTimers(0, diff >> ClockShift);
//arm9timer += (diff>>1);
NDS::ARM9Timestamp = NDS::ARM9Target;
}
break;
}
@ -536,24 +520,16 @@ s32 ARMv5::Execute()
if (NDS::IME[0] & 0x1)
TriggerIRQ();
}
NDS::ARM9Timestamp += Cycles;
Cycles = 0;
}
if (Halted == 2)
Halted = 0;
/*if (Cycles > lastcycles)
{
s32 diff = Cycles - lastcycles;
//NDS::RunTightTimers(0, diff >> ClockShift);
}*/
#ifdef DEBUG_CHECK_DESYNC
NDS::dbg_CyclesARM9 += (Cycles >> ClockShift);
#endif // DEBUG_CHECK_DESYNC
return Cycles;
}
s32 ARMv4::Execute()
void ARMv4::Execute()
{
if (Halted)
{
@ -569,19 +545,12 @@ s32 ARMv4::Execute()
}
else
{
Cycles = CyclesToRun;
#ifdef DEBUG_CHECK_DESYNC
NDS::dbg_CyclesARM7 += CyclesToRun;
#endif // DEBUG_CHECK_DESYNC
//NDS::RunTightTimers(1, CyclesToRun);
return Cycles;
NDS::ARM7Timestamp = NDS::ARM7Target;
return;
}
}
Cycles = 0;
s32 lastcycles = 0;
while (Cycles < CyclesToRun)
while (NDS::ARM7Timestamp < NDS::ARM7Target)
{
if (CPSR & 0x20) // THUMB
{
@ -613,19 +582,12 @@ s32 ARMv4::Execute()
AddCycles_C();
}
//s32 diff = Cycles - lastcycles;
//NDS::RunTightTimers(1, diff);
//lastcycles = Cycles;
// TODO optimize this shit!!!
if (Halted)
{
if (Halted == 1 && Cycles < CyclesToRun)
if (Halted == 1 && NDS::ARM7Timestamp < NDS::ARM7Target)
{
//s32 diff = CyclesToRun - Cycles;
Cycles = CyclesToRun;
//NDS::RunTightTimers(1, diff);
//arm7timer += diff;
NDS::ARM7Timestamp = NDS::ARM7Target;
}
break;
}
@ -634,20 +596,11 @@ s32 ARMv4::Execute()
if (NDS::IME[1] & 0x1)
TriggerIRQ();
}
NDS::ARM7Timestamp += Cycles;
Cycles = 0;
}
if (Halted == 2)
Halted = 0;
/*if (Cycles > lastcycles)
{
//s32 diff = Cycles - lastcycles;
//NDS::RunTightTimers(1, diff);
}*/
#ifdef DEBUG_CHECK_DESYNC
NDS::dbg_CyclesARM7 += Cycles;
#endif // DEBUG_CHECK_DESYNC
return Cycles;
}