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Code Issues Releases Wiki Activity

Implemented GPU synchronization protocol

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This commit is contained in:
Andrew Depke 2020-07-08 15:42:42 -06:00
parent 660f2cec7f
commit c768068ee7
1 changed files with 36 additions and 2 deletions
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38
TracyD3D12.hpp
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@ -50,8 +50,8 @@ namespace tracy
bool m_initialized = false;
ID3D12Device* m_device;
ID3D12CommandQueue* m_queue;
ID3D12Device* m_device = nullptr;
ID3D12CommandQueue* m_queue = nullptr;
uint8_t m_context;
Microsoft::WRL::ComPtr<ID3D12QueryHeap> m_queryHeap;
Microsoft::WRL::ComPtr<ID3D12Resource> m_readbackBuffer;
@ -65,6 +65,9 @@ namespace tracy
Microsoft::WRL::ComPtr<ID3D12Fence> m_payloadFence;
std::queue<D3D12QueryPayload> m_payloadQueue;
int64_t m_prevCalibration = 0;
int64_t m_qpcToNs = int64_t{ 1000000000 / GetFrequencyQpc() };
public:
D3D12QueueCtx(ID3D12Device* device, ID3D12CommandQueue* queue)
: m_device(device)
@ -98,6 +101,9 @@ namespace tracy
assert(false && "Failed to get queue clock calibration.");
}
// Save the device cpu timestamp, not the profiler's timestamp.
m_prevCalibration = cpuTimestamp * m_qpcToNs;
cpuTimestamp = Profiler::GetTime();
D3D12_QUERY_HEAP_DESC heapDesc{};
@ -233,6 +239,34 @@ namespace tracy
}
m_readbackBuffer->Unmap(0, nullptr);
// Recalibrate to account for drift.
uint64_t cpuTimestamp;
uint64_t gpuTimestamp;
if (FAILED(m_queue->GetClockCalibration(&gpuTimestamp, &cpuTimestamp)))
{
assert(false && "Failed to get queue clock calibration.");
}
cpuTimestamp *= m_qpcToNs;
const auto cpuDelta = cpuTimestamp - m_prevCalibration;
if (cpuDelta > 0)
{
m_prevCalibration = cpuTimestamp;
cpuTimestamp = Profiler::GetTime();
auto* item = Profiler::QueueSerial();
MemWrite(&item->hdr.type, QueueType::GpuCalibration);
MemWrite(&item->gpuCalibration.gpuTime, gpuTimestamp);
MemWrite(&item->gpuCalibration.cpuTime, cpuTimestamp);
MemWrite(&item->gpuCalibration.cpuDelta, cpuDelta);
MemWrite(&item->gpuCalibration.context, m_context);
Profiler::QueueSerialFinish();
}
}
private: