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

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* 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
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30
src/GPU3D.cpp
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@ -91,6 +91,7 @@
// and imposes rules on when further vertex commands can run
// (one every 9-cycle time slot during polygon setup)
// polygon setup time is 27 cycles for a triangle and 36 for a quad
// except: only one time slot is taken if the polygon is rejected by culling/clipping
// * additionally, some commands (BEGIN, LIGHT_VECTOR, BOXTEST) stall the polygon pipeline
@ -182,6 +183,7 @@ u32 GXStat;
u32 ExecParams[32];
u32 ExecParamCount;
u64 Timestamp;
s32 CycleCount;
s32 VertexPipeline;
s32 NormalPipeline;
@ -330,6 +332,7 @@ void Reset()
memset(ExecParams, 0, 32*4);
ExecParamCount = 0;
Timestamp = 0;
CycleCount = 0;
VertexPipeline = 0;
NormalPipeline = 0;
@ -405,6 +408,7 @@ void DoSavestate(Savestate* file)
file->VarArray(ExecParams, 32*4);
file->Var32(&ExecParamCount);
file->Var32((u32*)&CycleCount);
file->Var64(&Timestamp);
file->Var32(&MatrixMode);
@ -2271,16 +2275,18 @@ void FinishWork(s32 cycles)
GXStat &= ~(1<<27);
}
void Run(s32 cycles)
void Run()
{
if (!GeometryEnabled)
return;
if (FlushRequest)
return;
if (CmdPIPE->IsEmpty() && !(GXStat & (1<<27)))
if (!GeometryEnabled || FlushRequest ||
(CmdPIPE->IsEmpty() && !(GXStat & (1<<27))))
{
Timestamp = NDS::ARM9Timestamp >> NDS::ARM9ClockShift;
return;
}
s32 cycles = (NDS::ARM9Timestamp >> NDS::ARM9ClockShift) - Timestamp;
CycleCount -= cycles;
Timestamp = NDS::ARM9Timestamp >> NDS::ARM9ClockShift;
if (CycleCount <= 0)
{
@ -2465,21 +2471,27 @@ u8 Read8(u32 addr)
switch (addr)
{
case 0x04000600:
Run();
return GXStat & 0xFF;
case 0x04000601:
{
Run();
return ((GXStat >> 8) & 0xFF) |
(PosMatrixStackPointer & 0x1F) |
((ProjMatrixStackPointer & 0x1) << 5);
}
case 0x04000602:
{
Run();
u32 fifolevel = CmdFIFO->Level();
return fifolevel & 0xFF;
}
case 0x04000603:
{
Run();
u32 fifolevel = CmdFIFO->Level();
return ((GXStat >> 24) & 0xFF) |
@ -2505,12 +2517,16 @@ u16 Read16(u32 addr)
case 0x04000600:
{
Run();
return (GXStat & 0xFFFF) |
((PosMatrixStackPointer & 0x1F) << 8) |
((ProjMatrixStackPointer & 0x1) << 13);
}
case 0x04000602:
{
Run();
u32 fifolevel = CmdFIFO->Level();
return (GXStat >> 16) |
@ -2545,6 +2561,8 @@ u32 Read32(u32 addr)
case 0x04000600:
{
Run();
u32 fifolevel = CmdFIFO->Level();
return GXStat |