Add GpuTimeSync event

Allows to resynchronise GPU and CPU timestamps during profiling.

public/client/TracyProfiler.cpp

@@ -4293,6 +4293,15 @@ TRACY_API void ___tracy_emit_gpu_calibration( const struct ___tracy_gpu_calibrat
     TracyLfqCommitC;
 }
 
+TRACY_API void ___tracy_emit_gpu_time_sync( const struct ___tracy_gpu_time_sync_data data )
+{
+    TracyLfqPrepareC( tracy::QueueType::GpuTimeSync );
+    tracy::MemWrite( &item->gpuTimeSync.cpuTime, tracy::Profiler::GetTime() );
+    tracy::MemWrite( &item->gpuTimeSync.gpuTime, data.gpuTime );
+    tracy::MemWrite( &item->gpuTimeSync.context, data.context );
+    TracyLfqCommitC;
+}
+
 TRACY_API void ___tracy_emit_gpu_zone_begin_serial( const struct ___tracy_gpu_zone_begin_data data )
 {
     auto item = tracy::Profiler::QueueSerial();
@@ -4400,6 +4409,16 @@ TRACY_API void ___tracy_emit_gpu_calibration_serial( const struct ___tracy_gpu_c
     tracy::Profiler::QueueSerialFinish();
 }
 
+TRACY_API void ___tracy_emit_gpu_time_sync_serial( const struct ___tracy_gpu_time_sync_data data )
+{
+    auto item = tracy::Profiler::QueueSerial();
+    tracy::MemWrite( &item->hdr.type, tracy::QueueType::GpuTimeSync );
+    tracy::MemWrite( &item->gpuTimeSync.cpuTime, tracy::Profiler::GetTime() );
+    tracy::MemWrite( &item->gpuTimeSync.gpuTime, data.gpuTime );
+    tracy::MemWrite( &item->gpuTimeSync.context, data.context );
+    tracy::Profiler::QueueSerialFinish();
+}
+
 TRACY_API int ___tracy_connected( void )
 {
     return tracy::GetProfiler().IsConnected();

public/common/TracyProtocol.hpp

@@ -9,7 +9,7 @@ namespace tracy
 
 constexpr unsigned Lz4CompressBound( unsigned isize ) { return isize + ( isize / 255 ) + 16; }
 
-enum : uint32_t { ProtocolVersion = 64 };
+enum : uint32_t { ProtocolVersion = 65 };
 enum : uint16_t { BroadcastVersion = 3 };
 
 using lz4sz_t = uint32_t;

public/common/TracyQueue.hpp

@@ -70,6 +70,7 @@ enum class QueueType : uint8_t
     KeepAlive,
     ThreadContext,
     GpuCalibration,
+    GpuTimeSync,
     Crash,
     CrashReport,
     ZoneValidation,
@@ -453,6 +454,13 @@ struct QueueGpuCalibration
     uint8_t context;
 };
 
+struct QueueGpuTimeSync
+{
+    int64_t gpuTime;
+    int64_t cpuTime;
+    uint8_t context;
+};
+    
 struct QueueGpuContextName
 {
     uint8_t context;
@@ -718,6 +726,7 @@ struct QueueItem
         QueueGpuZoneEnd gpuZoneEnd;
         QueueGpuTime gpuTime;
         QueueGpuCalibration gpuCalibration;
+        QueueGpuTimeSync gpuTimeSync;
         QueueGpuContextName gpuContextName;
         QueueGpuContextNameFat gpuContextNameFat;
         QueueMemAlloc memAlloc;
@@ -821,6 +830,7 @@ static constexpr size_t QueueDataSize[] = {
     sizeof( QueueHeader ),                                  // keep alive
     sizeof( QueueHeader ) + sizeof( QueueThreadContext ),
     sizeof( QueueHeader ) + sizeof( QueueGpuCalibration ),
+    sizeof( QueueHeader ) + sizeof( QueueGpuTimeSync ),
     sizeof( QueueHeader ),                                  // crash
     sizeof( QueueHeader ) + sizeof( QueueCrashReport ),
     sizeof( QueueHeader ) + sizeof( QueueZoneValidation ),

public/tracy/TracyC.h

@@ -172,6 +172,11 @@ struct ___tracy_gpu_calibration_data {
     uint8_t context;
 };
 
+struct ___tracy_gpu_time_sync_data {
+    int64_t gpuTime;
+    uint8_t context;
+};
+
 // Some containers don't support storing const types.
 // This struct, as visible to user, is immutable, so treat it as if const was declared here.
 typedef /*const*/ struct ___tracy_c_zone_context TracyCZoneCtx;
@@ -204,6 +209,7 @@ TRACY_API void ___tracy_emit_gpu_time( const struct ___tracy_gpu_time_data );
 TRACY_API void ___tracy_emit_gpu_new_context( const struct ___tracy_gpu_new_context_data );
 TRACY_API void ___tracy_emit_gpu_context_name( const struct ___tracy_gpu_context_name_data );
 TRACY_API void ___tracy_emit_gpu_calibration( const struct ___tracy_gpu_calibration_data );
+TRACY_API void ___tracy_emit_gpu_time_sync( const struct ___tracy_gpu_time_sync_data );
 
 TRACY_API void ___tracy_emit_gpu_zone_begin_serial( const struct ___tracy_gpu_zone_begin_data );
 TRACY_API void ___tracy_emit_gpu_zone_begin_callstack_serial( const struct ___tracy_gpu_zone_begin_callstack_data );
@@ -214,6 +220,7 @@ TRACY_API void ___tracy_emit_gpu_time_serial( const struct ___tracy_gpu_time_dat
 TRACY_API void ___tracy_emit_gpu_new_context_serial( const struct ___tracy_gpu_new_context_data );
 TRACY_API void ___tracy_emit_gpu_context_name_serial( const struct ___tracy_gpu_context_name_data );
 TRACY_API void ___tracy_emit_gpu_calibration_serial( const struct ___tracy_gpu_calibration_data );
+TRACY_API void ___tracy_emit_gpu_time_sync_serial( const struct ___tracy_gpu_time_sync_data );
 
 TRACY_API int ___tracy_connected(void);
 

server/TracyEventDebug.cpp

@@ -195,6 +195,9 @@ void EventDebug( const QueueItem& ev )
     case QueueType::GpuCalibration:
         fprintf( f, "ev %i (GpuCalibration)\n", ev.hdr.idx );
         break;
+    case QueueType::GpuTimeSync:
+        fprintf( f, "ev %i (GpuTimeSync)\n", ev.hdr.idx );
+        break;
     case QueueType::Crash:
         fprintf( f, "ev %i (Crash)\n", ev.hdr.idx );
         break;

server/TracyWorker.cpp

@@ -4589,6 +4589,9 @@ bool Worker::Process( const QueueItem& ev )
     case QueueType::GpuCalibration:
         ProcessGpuCalibration( ev.gpuCalibration );
         break;
+    case QueueType::GpuTimeSync:
+        ProcessGpuTimeSync( ev.gpuTimeSync );
+        break;
     case QueueType::GpuContextName:
         ProcessGpuContextName( ev.gpuContextName );
         break;
@@ -5921,6 +5924,29 @@ void Worker::ProcessGpuCalibration( const QueueGpuCalibration& ev )
     ctx->calibratedGpuTime = gpuTime;
     ctx->calibratedCpuTime = TscTime( ev.cpuTime );
 }
+    
+void Worker::ProcessGpuTimeSync( const QueueGpuTimeSync& ev )
+{
+    auto ctx = m_gpuCtxMap[ev.context];
+    assert( ctx );
+
+    int64_t gpuTime;
+    if( ctx->period == 1.f )
+    {
+        gpuTime = ev.gpuTime;
+    }
+    else
+    {
+        gpuTime = int64_t( double( ctx->period ) * ev.gpuTime );      // precision loss
+    }
+
+    const auto cpuTime = TscTime( ev.cpuTime );
+
+    ctx->timeDiff = cpuTime - gpuTime;
+    ctx->lastGpuTime = 0;
+    ctx->overflow = 0;
+    ctx->overflowMul = 0;
+}
 
 void Worker::ProcessGpuContextName( const QueueGpuContextName& ev )
 {

server/TracyWorker.hpp

@@ -722,6 +722,7 @@ private:
     tracy_force_inline void ProcessGpuZoneEnd( const QueueGpuZoneEnd& ev, bool serial );
     tracy_force_inline void ProcessGpuTime( const QueueGpuTime& ev );
     tracy_force_inline void ProcessGpuCalibration( const QueueGpuCalibration& ev );
+    tracy_force_inline void ProcessGpuTimeSync( const QueueGpuTimeSync& ev );
     tracy_force_inline void ProcessGpuContextName( const QueueGpuContextName& ev );
     tracy_force_inline MemEvent* ProcessMemAlloc( const QueueMemAlloc& ev );
     tracy_force_inline MemEvent* ProcessMemAllocNamed( const QueueMemAlloc& ev );