void SyncGPU(SyncGPUReason reason, bool may_move_read_ptr)
{
if (g_use_deterministic_gpu_thread)
{
s_gpu_mainloop.Wait();
if (!s_gpu_mainloop.IsRunning())
return;
// Opportunistically reset FIFOs so we don't wrap around.
if (may_move_read_ptr && s_fifo_aux_write_ptr != s_fifo_aux_read_ptr)
PanicAlert("aux fifo not synced (%p, %p)", s_fifo_aux_write_ptr, s_fifo_aux_read_ptr);
memmove(s_fifo_aux_data, s_fifo_aux_read_ptr, s_fifo_aux_write_ptr - s_fifo_aux_read_ptr);
s_fifo_aux_write_ptr -= (s_fifo_aux_read_ptr - s_fifo_aux_data);
s_fifo_aux_read_ptr = s_fifo_aux_data;
if (may_move_read_ptr)
{
u8* write_ptr = s_video_buffer_write_ptr;
// what's left over in the buffer
size_t size = write_ptr - s_video_buffer_pp_read_ptr;
memmove(s_video_buffer, s_video_buffer_pp_read_ptr, size);
// This change always decreases the pointers. We write seen_ptr
// after write_ptr here, and read it before in RunGpuLoop, so
// 'write_ptr > seen_ptr' there cannot become spuriously true.
s_video_buffer_write_ptr = write_ptr = s_video_buffer + size;
s_video_buffer_pp_read_ptr = s_video_buffer;
s_video_buffer_read_ptr = s_video_buffer;
s_video_buffer_seen_ptr = write_ptr;
}
}
}
TEST(BusyLoopTest, MultiThreaded)
{
Common::BlockingLoop loop;
Common::Event e;
for (int i = 0; i < 100; i++)
{
loop.Prepare();
std::thread loop_thread([&]() { loop.Run([&]() { e.Set(); }); });
// Ping - Pong
for (int j = 0; j < 10; j++)
{
loop.Wakeup();
e.Wait();
// Just waste some time. So the main loop did fall back to the sleep state much more likely.
Common::SleepCurrentThread(1);
}
for (int j = 0; j < 100; j++)
{
// We normally have to call Wakeup to assure the Event is triggered.
// But this check is for an internal feature of the BlockingLoop.
// It's implemented to fall back to a busy loop regulary.
// If we're in the busy loop, the payload (and so the Event) is called all the time.
// loop.Wakeup();
e.Wait();
}
loop.Stop();
loop_thread.join();
}
}
void EmulatorState(bool running)
{
s_emu_running_state.Set(running);
if (running)
s_gpu_mainloop.Wakeup();
else
s_gpu_mainloop.AllowSleep();
}
void RunGpu()
{
SCPFifoStruct &fifo = CommandProcessor::fifo;
const SConfig& param = SConfig::GetInstance();
// execute GPU
if (!param.bCPUThread || g_use_deterministic_gpu_thread)
{
bool reset_simd_state = false;
while (fifo.bFF_GPReadEnable && fifo.CPReadWriteDistance && !AtBreakpoint() )
{
if (g_use_deterministic_gpu_thread)
{
ReadDataFromFifoOnCPU(fifo.CPReadPointer);
s_gpu_mainloop.Wakeup();
}
else
{
if (!reset_simd_state)
{
FPURoundMode::SaveSIMDState();
FPURoundMode::LoadDefaultSIMDState();
reset_simd_state = true;
}
ReadDataFromFifo(fifo.CPReadPointer);
s_video_buffer_read_ptr = OpcodeDecoder_Run(DataReader(s_video_buffer_read_ptr, s_video_buffer_write_ptr), nullptr, false);
}
//DEBUG_LOG(COMMANDPROCESSOR, "Fifo wraps to base");
if (fifo.CPReadPointer == fifo.CPEnd)
fifo.CPReadPointer = fifo.CPBase;
else
fifo.CPReadPointer += 32;
fifo.CPReadWriteDistance -= 32;
}
CommandProcessor::SetCPStatusFromGPU();
if (reset_simd_state)
{
FPURoundMode::LoadSIMDState();
}
}
// wake up GPU thread
if (param.bCPUThread)
{
s_gpu_mainloop.Wakeup();
}
}
/* This function checks the emulated CPU - GPU distance and may wake up the GPU,
* or block the CPU if required. It should be called by the CPU thread regularly.
* @ticks The gone emulated CPU time.
* @return A good time to call WaitForGpuThread() next.
*/
static int WaitForGpuThread(int ticks)
{
const SConfig& param = SConfig::GetInstance();
int old = s_sync_ticks.fetch_add(ticks);
int now = old + ticks;
// GPU is idle, so stop polling.
if (old >= 0 && s_gpu_mainloop.IsDone())
return -1;
// Wakeup GPU
if (old < param.iSyncGpuMinDistance && now >= param.iSyncGpuMinDistance)
RunGpu();
// If the GPU is still sleeping, wait for a longer time
if (now < param.iSyncGpuMinDistance)
return GPU_TIME_SLOT_SIZE + param.iSyncGpuMinDistance - now;
// Wait for GPU
if (now >= param.iSyncGpuMaxDistance)
s_sync_wakeup_event.Wait();
return GPU_TIME_SLOT_SIZE;
}
// The deterministic_gpu_thread version.
static void ReadDataFromFifoOnCPU(u32 readPtr)
{
size_t len = 32;
u8 *write_ptr = s_video_buffer_write_ptr;
if (len > (size_t)(s_video_buffer + FIFO_SIZE - write_ptr))
{
// We can't wrap around while the GPU is working on the data.
// This should be very rare due to the reset in SyncGPU.
SyncGPU(SYNC_GPU_WRAPAROUND);
if (!s_gpu_mainloop.IsRunning())
{
// GPU is shutting down, so the next asserts may fail
return;
}
if (s_video_buffer_pp_read_ptr != s_video_buffer_read_ptr)
{
PanicAlert("desynced read pointers");
return;
}
write_ptr = s_video_buffer_write_ptr;
size_t existing_len = write_ptr - s_video_buffer_pp_read_ptr;
if (len > (size_t)(FIFO_SIZE - existing_len))
{
PanicAlert("FIFO out of bounds (existing %lu + new %lu > %lu)", (unsigned long) existing_len, (unsigned long) len, (unsigned long) FIFO_SIZE);
return;
}
}
Memory::CopyFromEmu(s_video_buffer_write_ptr, readPtr, len);
s_video_buffer_pp_read_ptr = OpcodeDecoder_Run<true>(DataReader(s_video_buffer_pp_read_ptr, write_ptr + len), nullptr, false);
// This would have to be locked if the GPU thread didn't spin.
s_video_buffer_write_ptr = write_ptr + len;
}
void Fifo_Init()
{
// Padded so that SIMD overreads in the vertex loader are safe
s_video_buffer = (u8*)AllocateMemoryPages(FIFO_SIZE + 4);
ResetVideoBuffer();
if (SConfig::GetInstance().bCPUThread)
s_gpu_mainloop.Prepare();
s_sync_ticks.store(0);
}
void FlushGpu()
{
const SConfig& param = SConfig::GetInstance();
if (!param.bCPUThread || g_use_deterministic_gpu_thread)
return;
s_gpu_mainloop.Wait();
}
// May be executed from any thread, even the graphics thread.
// Created to allow for self shutdown.
void ExitGpuLoop()
{
// This should break the wait loop in CPU thread
CommandProcessor::fifo.bFF_GPReadEnable = false;
FlushGpu();
// Terminate GPU thread loop
s_emu_running_state.store(true);
s_gpu_mainloop.Stop(false);
}
static int RunGpuOnCpu(int ticks)
{
SCPFifoStruct& fifo = CommandProcessor::fifo;
bool reset_simd_state = false;
int available_ticks = int(ticks * SConfig::GetInstance().fSyncGpuOverclock) + s_sync_ticks.load();
while (fifo.bFF_GPReadEnable && fifo.CPReadWriteDistance && !AtBreakpoint() &&
available_ticks >= 0)
{
if (s_use_deterministic_gpu_thread)
{
ReadDataFromFifoOnCPU(fifo.CPReadPointer);
s_gpu_mainloop.Wakeup();
}
else
{
if (!reset_simd_state)
{
FPURoundMode::SaveSIMDState();
FPURoundMode::LoadDefaultSIMDState();
reset_simd_state = true;
}
ReadDataFromFifo(fifo.CPReadPointer);
u32 cycles = 0;
s_video_buffer_read_ptr = OpcodeDecoder::Run(
DataReader(s_video_buffer_read_ptr, s_video_buffer_write_ptr), &cycles, false);
available_ticks -= cycles;
}
if (fifo.CPReadPointer == fifo.CPEnd)
fifo.CPReadPointer = fifo.CPBase;
else
fifo.CPReadPointer += 32;
fifo.CPReadWriteDistance -= 32;
}
CommandProcessor::SetCPStatusFromGPU();
if (reset_simd_state)
{
FPURoundMode::LoadSIMDState();
}
// Discard all available ticks as there is nothing to do any more.
s_sync_ticks.store(std::min(available_ticks, 0));
// If the GPU is idle, drop the handler.
if (available_ticks >= 0)
return -1;
// Always wait at least for GPU_TIME_SLOT_SIZE cycles.
return -available_ticks + GPU_TIME_SLOT_SIZE;
}
void Fifo_Shutdown()
{
if (s_gpu_mainloop.IsRunning())
PanicAlert("Fifo shutting down while active");
FreeMemoryPages(s_video_buffer, FIFO_SIZE + 4);
s_video_buffer = nullptr;
s_video_buffer_write_ptr = nullptr;
s_video_buffer_pp_read_ptr = nullptr;
s_video_buffer_read_ptr = nullptr;
s_video_buffer_seen_ptr = nullptr;
s_fifo_aux_write_ptr = nullptr;
s_fifo_aux_read_ptr = nullptr;
}
void PauseAndLock(bool doLock, bool unpauseOnUnlock)
{
if (doLock)
{
SyncGPU(SyncGPUReason::Other);
EmulatorState(false);
const SConfig& param = SConfig::GetInstance();
if (!param.bCPUThread || s_use_deterministic_gpu_thread)
return;
s_gpu_mainloop.WaitYield(std::chrono::milliseconds(100), Host_YieldToUI);
}
else
{
if (unpauseOnUnlock)
EmulatorState(true);
}
}
void RunGpu()
{
const SConfig& param = SConfig::GetInstance();
// wake up GPU thread
if (param.bCPUThread && !s_use_deterministic_gpu_thread)
{
s_gpu_mainloop.Wakeup();
}
// if the sync GPU callback is suspended, wake it up.
if (!SConfig::GetInstance().bCPUThread || s_use_deterministic_gpu_thread ||
SConfig::GetInstance().bSyncGPU)
{
if (s_syncing_suspended)
{
s_syncing_suspended = false;
CoreTiming::ScheduleEvent(GPU_TIME_SLOT_SIZE, s_event_sync_gpu, GPU_TIME_SLOT_SIZE);
}
}
}
void PushFifoAuxBuffer(void* ptr, size_t size)
{
if (size > (size_t) (s_fifo_aux_data + FIFO_SIZE - s_fifo_aux_write_ptr))
{
SyncGPU(SYNC_GPU_AUX_SPACE, /* may_move_read_ptr */ false);
if (!s_gpu_mainloop.IsRunning())
{
// GPU is shutting down
return;
}
if (size > (size_t) (s_fifo_aux_data + FIFO_SIZE - s_fifo_aux_write_ptr))
{
// That will sync us up to the last 32 bytes, so this short region
// of FIFO would have to point to a 2MB display list or something.
PanicAlert("absurdly large aux buffer");
return;
}
}
memcpy(s_fifo_aux_write_ptr, ptr, size);
s_fifo_aux_write_ptr += size;
}
int Fifo_Update(int ticks)
{
const SConfig& param = SConfig::GetInstance();
if (ticks == 0)
{
FlushGpu();
return param.iSyncGpuMaxDistance;
}
// GPU is sleeping, so no need for synchronization
if (s_gpu_mainloop.IsDone() || g_use_deterministic_gpu_thread)
{
if (s_sync_ticks.load() < 0)
{
int old = s_sync_ticks.fetch_add(ticks);
if (old < param.iSyncGpuMinDistance && old + ticks >= param.iSyncGpuMinDistance)
RunGpu();
}
return param.iSyncGpuMaxDistance;
}
int old = s_sync_ticks.fetch_add(ticks);
if (old < param.iSyncGpuMinDistance && old + ticks >= param.iSyncGpuMinDistance)
RunGpu();
if (s_sync_ticks.load() >= param.iSyncGpuMaxDistance)
{
while (s_sync_ticks.load() > 0)
{
s_sync_wakeup_event.Wait();
}
}
return param.iSyncGpuMaxDistance - s_sync_ticks.load();
}
void EmulatorState(bool running)
{
s_emu_running_state.store(running);
s_gpu_mainloop.Wakeup();
}
namespace Fifo
{
static constexpr u32 FIFO_SIZE = 2 * 1024 * 1024;
static constexpr int GPU_TIME_SLOT_SIZE = 1000;
static Common::BlockingLoop s_gpu_mainloop;
static Common::Flag s_emu_running_state;
// Most of this array is unlikely to be faulted in...
static u8 s_fifo_aux_data[FIFO_SIZE];
static u8* s_fifo_aux_write_ptr;
static u8* s_fifo_aux_read_ptr;
// This could be in SConfig, but it depends on multiple settings
// and can change at runtime.
static bool s_use_deterministic_gpu_thread;
static CoreTiming::EventType* s_event_sync_gpu;
// STATE_TO_SAVE
static u8* s_video_buffer;
static u8* s_video_buffer_read_ptr;
static std::atomic<u8*> s_video_buffer_write_ptr;
static std::atomic<u8*> s_video_buffer_seen_ptr;
static u8* s_video_buffer_pp_read_ptr;
// The read_ptr is always owned by the GPU thread. In normal mode, so is the
// write_ptr, despite it being atomic. In deterministic GPU thread mode,
// things get a bit more complicated:
// - The seen_ptr is written by the GPU thread, and points to what it's already
// processed as much of as possible - in the case of a partial command which
// caused it to stop, not the same as the read ptr. It's written by the GPU,
// under the lock, and updating the cond.
// - The write_ptr is written by the CPU thread after it copies data from the
// FIFO. Maybe someday it will be under the lock. For now, because RunGpuLoop
// polls, it's just atomic.
// - The pp_read_ptr is the CPU preprocessing version of the read_ptr.
static std::atomic<int> s_sync_ticks;
static bool s_syncing_suspended;
static Common::Event s_sync_wakeup_event;
void DoState(PointerWrap& p)
{
p.DoArray(s_video_buffer, FIFO_SIZE);
u8* write_ptr = s_video_buffer_write_ptr;
p.DoPointer(write_ptr, s_video_buffer);
s_video_buffer_write_ptr = write_ptr;
p.DoPointer(s_video_buffer_read_ptr, s_video_buffer);
if (p.mode == PointerWrap::MODE_READ && s_use_deterministic_gpu_thread)
{
// We're good and paused, right?
s_video_buffer_seen_ptr = s_video_buffer_pp_read_ptr = s_video_buffer_read_ptr;
}
p.Do(s_sync_ticks);
p.Do(s_syncing_suspended);
}
void PauseAndLock(bool doLock, bool unpauseOnUnlock)
{
if (doLock)
{
SyncGPU(SyncGPUReason::Other);
EmulatorState(false);
const SConfig& param = SConfig::GetInstance();
if (!param.bCPUThread || s_use_deterministic_gpu_thread)
return;
s_gpu_mainloop.WaitYield(std::chrono::milliseconds(100), Host_YieldToUI);
}
else
{
if (unpauseOnUnlock)
EmulatorState(true);
}
}
void Init()
{
// Padded so that SIMD overreads in the vertex loader are safe
s_video_buffer = static_cast<u8*>(Common::AllocateMemoryPages(FIFO_SIZE + 4));
ResetVideoBuffer();
if (SConfig::GetInstance().bCPUThread)
s_gpu_mainloop.Prepare();
s_sync_ticks.store(0);
}
void Shutdown()
{
if (s_gpu_mainloop.IsRunning())
PanicAlert("Fifo shutting down while active");
Common::FreeMemoryPages(s_video_buffer, FIFO_SIZE + 4);
s_video_buffer = nullptr;
s_video_buffer_write_ptr = nullptr;
s_video_buffer_pp_read_ptr = nullptr;
s_video_buffer_read_ptr = nullptr;
s_video_buffer_seen_ptr = nullptr;
s_fifo_aux_write_ptr = nullptr;
s_fifo_aux_read_ptr = nullptr;
}
// May be executed from any thread, even the graphics thread.
// Created to allow for self shutdown.
void ExitGpuLoop()
{
// This should break the wait loop in CPU thread
CommandProcessor::fifo.bFF_GPReadEnable = false;
FlushGpu();
// Terminate GPU thread loop
s_emu_running_state.Set();
s_gpu_mainloop.Stop(false);
}
void EmulatorState(bool running)
{
s_emu_running_state.Set(running);
if (running)
s_gpu_mainloop.Wakeup();
else
s_gpu_mainloop.AllowSleep();
}
void SyncGPU(SyncGPUReason reason, bool may_move_read_ptr)
{
if (s_use_deterministic_gpu_thread)
{
s_gpu_mainloop.Wait();
if (!s_gpu_mainloop.IsRunning())
return;
// Opportunistically reset FIFOs so we don't wrap around.
if (may_move_read_ptr && s_fifo_aux_write_ptr != s_fifo_aux_read_ptr)
PanicAlert("aux fifo not synced (%p, %p)", s_fifo_aux_write_ptr, s_fifo_aux_read_ptr);
memmove(s_fifo_aux_data, s_fifo_aux_read_ptr, s_fifo_aux_write_ptr - s_fifo_aux_read_ptr);
s_fifo_aux_write_ptr -= (s_fifo_aux_read_ptr - s_fifo_aux_data);
s_fifo_aux_read_ptr = s_fifo_aux_data;
if (may_move_read_ptr)
{
u8* write_ptr = s_video_buffer_write_ptr;
// what's left over in the buffer
size_t size = write_ptr - s_video_buffer_pp_read_ptr;
memmove(s_video_buffer, s_video_buffer_pp_read_ptr, size);
// This change always decreases the pointers. We write seen_ptr
// after write_ptr here, and read it before in RunGpuLoop, so
// 'write_ptr > seen_ptr' there cannot become spuriously true.
s_video_buffer_write_ptr = write_ptr = s_video_buffer + size;
s_video_buffer_pp_read_ptr = s_video_buffer;
s_video_buffer_read_ptr = s_video_buffer;
s_video_buffer_seen_ptr = write_ptr;
}
}
}
void PushFifoAuxBuffer(void* ptr, size_t size)
{
if (size > (size_t)(s_fifo_aux_data + FIFO_SIZE - s_fifo_aux_write_ptr))
{
SyncGPU(SyncGPUReason::AuxSpace, /* may_move_read_ptr */ false);
if (!s_gpu_mainloop.IsRunning())
{
// GPU is shutting down
return;
}
if (size > (size_t)(s_fifo_aux_data + FIFO_SIZE - s_fifo_aux_write_ptr))
{
// That will sync us up to the last 32 bytes, so this short region
// of FIFO would have to point to a 2MB display list or something.
PanicAlert("absurdly large aux buffer");
return;
}
}
memcpy(s_fifo_aux_write_ptr, ptr, size);
s_fifo_aux_write_ptr += size;
}
void* PopFifoAuxBuffer(size_t size)
{
void* ret = s_fifo_aux_read_ptr;
s_fifo_aux_read_ptr += size;
return ret;
}
// Description: RunGpuLoop() sends data through this function.
static void ReadDataFromFifo(u32 readPtr)
{
size_t len = 32;
if (len > (size_t)(s_video_buffer + FIFO_SIZE - s_video_buffer_write_ptr))
{
size_t existing_len = s_video_buffer_write_ptr - s_video_buffer_read_ptr;
if (len > (size_t)(FIFO_SIZE - existing_len))
{
PanicAlert("FIFO out of bounds (existing %zu + new %zu > %lu)", existing_len, len,
(unsigned long)FIFO_SIZE);
return;
}
memmove(s_video_buffer, s_video_buffer_read_ptr, existing_len);
s_video_buffer_write_ptr = s_video_buffer + existing_len;
s_video_buffer_read_ptr = s_video_buffer;
}
// Copy new video instructions to s_video_buffer for future use in rendering the new picture
Memory::CopyFromEmu(s_video_buffer_write_ptr, readPtr, len);
s_video_buffer_write_ptr += len;
}
// The deterministic_gpu_thread version.
static void ReadDataFromFifoOnCPU(u32 readPtr)
{
size_t len = 32;
u8* write_ptr = s_video_buffer_write_ptr;
if (len > (size_t)(s_video_buffer + FIFO_SIZE - write_ptr))
{
// We can't wrap around while the GPU is working on the data.
// This should be very rare due to the reset in SyncGPU.
SyncGPU(SyncGPUReason::Wraparound);
if (!s_gpu_mainloop.IsRunning())
{
// GPU is shutting down, so the next asserts may fail
return;
}
if (s_video_buffer_pp_read_ptr != s_video_buffer_read_ptr)
{
PanicAlert("desynced read pointers");
return;
}
write_ptr = s_video_buffer_write_ptr;
size_t existing_len = write_ptr - s_video_buffer_pp_read_ptr;
if (len > (size_t)(FIFO_SIZE - existing_len))
{
PanicAlert("FIFO out of bounds (existing %zu + new %zu > %lu)", existing_len, len,
(unsigned long)FIFO_SIZE);
return;
}
}
Memory::CopyFromEmu(s_video_buffer_write_ptr, readPtr, len);
s_video_buffer_pp_read_ptr = OpcodeDecoder::Run<true>(
DataReader(s_video_buffer_pp_read_ptr, write_ptr + len), nullptr, false);
// This would have to be locked if the GPU thread didn't spin.
s_video_buffer_write_ptr = write_ptr + len;
}
void ResetVideoBuffer()
{
s_video_buffer_read_ptr = s_video_buffer;
s_video_buffer_write_ptr = s_video_buffer;
s_video_buffer_seen_ptr = s_video_buffer;
s_video_buffer_pp_read_ptr = s_video_buffer;
s_fifo_aux_write_ptr = s_fifo_aux_data;
s_fifo_aux_read_ptr = s_fifo_aux_data;
}
// Description: Main FIFO update loop
// Purpose: Keep the Core HW updated about the CPU-GPU distance
void RunGpuLoop()
{
AsyncRequests::GetInstance()->SetEnable(true);
AsyncRequests::GetInstance()->SetPassthrough(false);
s_gpu_mainloop.Run(
[] {
const SConfig& param = SConfig::GetInstance();
g_video_backend->PeekMessages();
// Do nothing while paused
if (!s_emu_running_state.IsSet())
return;
if (s_use_deterministic_gpu_thread)
{
AsyncRequests::GetInstance()->PullEvents();
// All the fifo/CP stuff is on the CPU. We just need to run the opcode decoder.
u8* seen_ptr = s_video_buffer_seen_ptr;
u8* write_ptr = s_video_buffer_write_ptr;
// See comment in SyncGPU
if (write_ptr > seen_ptr)
{
s_video_buffer_read_ptr =
OpcodeDecoder::Run(DataReader(s_video_buffer_read_ptr, write_ptr), nullptr, false);
s_video_buffer_seen_ptr = write_ptr;
}
}
else
{
SCPFifoStruct& fifo = CommandProcessor::fifo;
AsyncRequests::GetInstance()->PullEvents();
CommandProcessor::SetCPStatusFromGPU();
// check if we are able to run this buffer
while (!CommandProcessor::IsInterruptWaiting() && fifo.bFF_GPReadEnable &&
fifo.CPReadWriteDistance && !AtBreakpoint())
{
if (param.bSyncGPU && s_sync_ticks.load() < param.iSyncGpuMinDistance)
break;
u32 cyclesExecuted = 0;
u32 readPtr = fifo.CPReadPointer;
ReadDataFromFifo(readPtr);
if (readPtr == fifo.CPEnd)
readPtr = fifo.CPBase;
else
readPtr += 32;
_assert_msg_(COMMANDPROCESSOR, (s32)fifo.CPReadWriteDistance - 32 >= 0,
"Negative fifo.CPReadWriteDistance = %i in FIFO Loop !\nThat can produce "
"instability in the game. Please report it.",
fifo.CPReadWriteDistance - 32);
u8* write_ptr = s_video_buffer_write_ptr;
s_video_buffer_read_ptr = OpcodeDecoder::Run(
DataReader(s_video_buffer_read_ptr, write_ptr), &cyclesExecuted, false);
Common::AtomicStore(fifo.CPReadPointer, readPtr);
Common::AtomicAdd(fifo.CPReadWriteDistance, -32);
if ((write_ptr - s_video_buffer_read_ptr) == 0)
Common::AtomicStore(fifo.SafeCPReadPointer, fifo.CPReadPointer);
CommandProcessor::SetCPStatusFromGPU();
if (param.bSyncGPU)
{
cyclesExecuted = (int)(cyclesExecuted / param.fSyncGpuOverclock);
int old = s_sync_ticks.fetch_sub(cyclesExecuted);
if (old >= param.iSyncGpuMaxDistance &&
old - (int)cyclesExecuted < param.iSyncGpuMaxDistance)
s_sync_wakeup_event.Set();
}
// This call is pretty important in DualCore mode and must be called in the FIFO Loop.
// If we don't, s_swapRequested or s_efbAccessRequested won't be set to false
// leading the CPU thread to wait in Video_BeginField or Video_AccessEFB thus slowing
// things down.
AsyncRequests::GetInstance()->PullEvents();
}
// fast skip remaining GPU time if fifo is empty
if (s_sync_ticks.load() > 0)
{
int old = s_sync_ticks.exchange(0);
if (old >= param.iSyncGpuMaxDistance)
s_sync_wakeup_event.Set();
}
// The fifo is empty and it's unlikely we will get any more work in the near future.
// Make sure VertexManager finishes drawing any primitives it has stored in it's buffer.
g_vertex_manager->Flush();
}
},
100);
AsyncRequests::GetInstance()->SetEnable(false);
AsyncRequests::GetInstance()->SetPassthrough(true);
}
void FlushGpu()
{
const SConfig& param = SConfig::GetInstance();
if (!param.bCPUThread || s_use_deterministic_gpu_thread)
return;
s_gpu_mainloop.Wait();
}
void GpuMaySleep()
{
s_gpu_mainloop.AllowSleep();
}
bool AtBreakpoint()
{
SCPFifoStruct& fifo = CommandProcessor::fifo;
return fifo.bFF_BPEnable && (fifo.CPReadPointer == fifo.CPBreakpoint);
}
void RunGpu()
{
const SConfig& param = SConfig::GetInstance();
// wake up GPU thread
if (param.bCPUThread && !s_use_deterministic_gpu_thread)
{
s_gpu_mainloop.Wakeup();
}
// if the sync GPU callback is suspended, wake it up.
if (!SConfig::GetInstance().bCPUThread || s_use_deterministic_gpu_thread ||
SConfig::GetInstance().bSyncGPU)
{
if (s_syncing_suspended)
{
s_syncing_suspended = false;
CoreTiming::ScheduleEvent(GPU_TIME_SLOT_SIZE, s_event_sync_gpu, GPU_TIME_SLOT_SIZE);
}
}
}
static int RunGpuOnCpu(int ticks)
{
SCPFifoStruct& fifo = CommandProcessor::fifo;
bool reset_simd_state = false;
int available_ticks = int(ticks * SConfig::GetInstance().fSyncGpuOverclock) + s_sync_ticks.load();
while (fifo.bFF_GPReadEnable && fifo.CPReadWriteDistance && !AtBreakpoint() &&
available_ticks >= 0)
{
if (s_use_deterministic_gpu_thread)
{
ReadDataFromFifoOnCPU(fifo.CPReadPointer);
s_gpu_mainloop.Wakeup();
}
else
{
if (!reset_simd_state)
{
FPURoundMode::SaveSIMDState();
FPURoundMode::LoadDefaultSIMDState();
reset_simd_state = true;
}
ReadDataFromFifo(fifo.CPReadPointer);
u32 cycles = 0;
s_video_buffer_read_ptr = OpcodeDecoder::Run(
DataReader(s_video_buffer_read_ptr, s_video_buffer_write_ptr), &cycles, false);
available_ticks -= cycles;
}
if (fifo.CPReadPointer == fifo.CPEnd)
fifo.CPReadPointer = fifo.CPBase;
else
fifo.CPReadPointer += 32;
fifo.CPReadWriteDistance -= 32;
}
CommandProcessor::SetCPStatusFromGPU();
if (reset_simd_state)
{
FPURoundMode::LoadSIMDState();
}
// Discard all available ticks as there is nothing to do any more.
s_sync_ticks.store(std::min(available_ticks, 0));
// If the GPU is idle, drop the handler.
if (available_ticks >= 0)
return -1;
// Always wait at least for GPU_TIME_SLOT_SIZE cycles.
return -available_ticks + GPU_TIME_SLOT_SIZE;
}
void UpdateWantDeterminism(bool want)
{
// We are paused (or not running at all yet), so
// it should be safe to change this.
const SConfig& param = SConfig::GetInstance();
bool gpu_thread = false;
switch (param.m_GPUDeterminismMode)
{
case GPU_DETERMINISM_AUTO:
gpu_thread = want;
// Hack: For now movies are an exception to this being on (but not
// to wanting determinism in general). Once vertex arrays are
// fixed, there should be no reason to want this off for movies by
// default, so this can be removed.
if (!NetPlay::IsNetPlayRunning())
gpu_thread = false;
break;
case GPU_DETERMINISM_NONE:
gpu_thread = false;
break;
case GPU_DETERMINISM_FAKE_COMPLETION:
gpu_thread = true;
break;
}
gpu_thread = gpu_thread && param.bCPUThread;
if (s_use_deterministic_gpu_thread != gpu_thread)
{
s_use_deterministic_gpu_thread = gpu_thread;
if (gpu_thread)
{
// These haven't been updated in non-deterministic mode.
s_video_buffer_seen_ptr = s_video_buffer_pp_read_ptr = s_video_buffer_read_ptr;
CopyPreprocessCPStateFromMain();
VertexLoaderManager::MarkAllDirty();
}
}
}
bool UseDeterministicGPUThread()
{
return s_use_deterministic_gpu_thread;
}
/* This function checks the emulated CPU - GPU distance and may wake up the GPU,
* or block the CPU if required. It should be called by the CPU thread regularly.
* @ticks The gone emulated CPU time.
* @return A good time to call WaitForGpuThread() next.
*/
static int WaitForGpuThread(int ticks)
{
const SConfig& param = SConfig::GetInstance();
int old = s_sync_ticks.fetch_add(ticks);
int now = old + ticks;
// GPU is idle, so stop polling.
if (old >= 0 && s_gpu_mainloop.IsDone())
return -1;
// Wakeup GPU
if (old < param.iSyncGpuMinDistance && now >= param.iSyncGpuMinDistance)
RunGpu();
// If the GPU is still sleeping, wait for a longer time
if (now < param.iSyncGpuMinDistance)
return GPU_TIME_SLOT_SIZE + param.iSyncGpuMinDistance - now;
// Wait for GPU
if (now >= param.iSyncGpuMaxDistance)
s_sync_wakeup_event.Wait();
return GPU_TIME_SLOT_SIZE;
}
static void SyncGPUCallback(u64 ticks, s64 cyclesLate)
{
ticks += cyclesLate;
int next = -1;
if (!SConfig::GetInstance().bCPUThread || s_use_deterministic_gpu_thread)
{
next = RunGpuOnCpu((int)ticks);
}
else if (SConfig::GetInstance().bSyncGPU)
{
next = WaitForGpuThread((int)ticks);
}
s_syncing_suspended = next < 0;
if (!s_syncing_suspended)
CoreTiming::ScheduleEvent(next, s_event_sync_gpu, next);
}
// Initialize GPU - CPU thread syncing, this gives us a deterministic way to start the GPU thread.
void Prepare()
{
s_event_sync_gpu = CoreTiming::RegisterEvent("SyncGPUCallback", SyncGPUCallback);
s_syncing_suspended = true;
}
}
void GpuMaySleep()
{
s_gpu_mainloop.AllowSleep();
}
// Description: Main FIFO update loop
// Purpose: Keep the Core HW updated about the CPU-GPU distance
void RunGpuLoop()
{
AsyncRequests::GetInstance()->SetEnable(true);
AsyncRequests::GetInstance()->SetPassthrough(false);
s_gpu_mainloop.Run(
[] {
const SConfig& param = SConfig::GetInstance();
g_video_backend->PeekMessages();
// Do nothing while paused
if (!s_emu_running_state.load())
return;
if (g_use_deterministic_gpu_thread)
{
AsyncRequests::GetInstance()->PullEvents();
// All the fifo/CP stuff is on the CPU. We just need to run the opcode decoder.
u8* seen_ptr = s_video_buffer_seen_ptr;
u8* write_ptr = s_video_buffer_write_ptr;
// See comment in SyncGPU
if (write_ptr > seen_ptr)
{
s_video_buffer_read_ptr = OpcodeDecoder_Run(DataReader(s_video_buffer_read_ptr, write_ptr), nullptr, false);
s_video_buffer_seen_ptr = write_ptr;
}
}
else
{
SCPFifoStruct &fifo = CommandProcessor::fifo;
AsyncRequests::GetInstance()->PullEvents();
CommandProcessor::SetCPStatusFromGPU();
// check if we are able to run this buffer
while (!CommandProcessor::IsInterruptWaiting() && fifo.bFF_GPReadEnable && fifo.CPReadWriteDistance && !AtBreakpoint())
{
if (param.bSyncGPU && s_sync_ticks.load() < param.iSyncGpuMinDistance)
break;
u32 cyclesExecuted = 0;
u32 readPtr = fifo.CPReadPointer;
ReadDataFromFifo(readPtr);
if (readPtr == fifo.CPEnd)
readPtr = fifo.CPBase;
else
readPtr += 32;
_assert_msg_(COMMANDPROCESSOR, (s32)fifo.CPReadWriteDistance - 32 >= 0 ,
"Negative fifo.CPReadWriteDistance = %i in FIFO Loop !\nThat can produce instability in the game. Please report it.", fifo.CPReadWriteDistance - 32);
u8* write_ptr = s_video_buffer_write_ptr;
s_video_buffer_read_ptr = OpcodeDecoder_Run(DataReader(s_video_buffer_read_ptr, write_ptr), &cyclesExecuted, false);
Common::AtomicStore(fifo.CPReadPointer, readPtr);
Common::AtomicAdd(fifo.CPReadWriteDistance, -32);
if ((write_ptr - s_video_buffer_read_ptr) == 0)
Common::AtomicStore(fifo.SafeCPReadPointer, fifo.CPReadPointer);
CommandProcessor::SetCPStatusFromGPU();
if (param.bSyncGPU)
{
cyclesExecuted = (int)(cyclesExecuted / param.fSyncGpuOverclock);
int old = s_sync_ticks.fetch_sub(cyclesExecuted);
if (old > 0 && old - (int)cyclesExecuted <= 0)
s_sync_wakeup_event.Set();
}
// This call is pretty important in DualCore mode and must be called in the FIFO Loop.
// If we don't, s_swapRequested or s_efbAccessRequested won't be set to false
// leading the CPU thread to wait in Video_BeginField or Video_AccessEFB thus slowing things down.
AsyncRequests::GetInstance()->PullEvents();
}
// fast skip remaining GPU time if fifo is empty
if (s_sync_ticks.load() > 0)
{
int old = s_sync_ticks.exchange(0);
if (old > 0)
s_sync_wakeup_event.Set();
}
// The fifo is empty and it's unlikely we will get any more work in the near future.
// Make sure VertexManager finishes drawing any primitives it has stored in it's buffer.
VertexManager::Flush();
}
}, 100);
AsyncRequests::GetInstance()->SetEnable(false);
AsyncRequests::GetInstance()->SetPassthrough(true);
}
