Make GPU zones colored according to their thread

There was an issue that the GPU zones were always purple. This patch
changes the the color of GPU zones to match the CPU thread making the
GPU calls.

Author: Eric Eaton

profiler/src/profiler/TracyView_GpuTimeline.cpp

@@ -38,15 +38,24 @@ bool View::DrawGpu( const TimelineContext& ctx, const GpuCtxData& gpu, int& offs
     {
         auto& tl = td.second.timeline;
         assert( !tl.empty() );
+        uint64_t thread = gpu.thread;
+        if( thread == 0 )
+        {
+            thread = td.first;
+        }
         if( tl.is_magic() )
         {
             auto& tlm = *(Vector<ZoneEvent>*)&tl;
             if( tlm.front().Start() >= 0 )
             {
+                if( thread == 0 )
+                {
+                    thread = m_worker.GetGpuExtra( tlm.front() ).Thread();
+                }
                 const auto begin = tlm.front().Start();
                 const auto drift = GpuDrift( &gpu );
                 if( !singleThread ) offset += sstep;
-                const auto partDepth = DispatchGpuZoneLevel( tl, hover, pxns, int64_t( nspx ), wpos, offset, 0, gpu.thread, &gpu, yMin, yMax, begin, drift );
+                const auto partDepth = DispatchGpuZoneLevel( tl, hover, pxns, int64_t( nspx ), wpos, offset, 0, thread, &gpu, yMin, yMax, begin, drift );
                 if( partDepth != 0 )
                 {
                     if( !singleThread )
@@ -70,10 +79,14 @@ bool View::DrawGpu( const TimelineContext& ctx, const GpuCtxData& gpu, int& offs
         {
             if( tl.front()->Start() >= 0 )
             {
+                if( thread == 0 )
+                {
+                    thread = m_worker.GetGpuExtra( *tl.front() ).Thread();
+                }
                 const auto begin = tl.front()->Start();
                 const auto drift = GpuDrift( &gpu );
                 if( !singleThread ) offset += sstep;
-                const auto partDepth = DispatchGpuZoneLevel( tl, hover, pxns, int64_t( nspx ), wpos, offset, 0, gpu.thread, &gpu, yMin, yMax, begin, drift );
+                const auto partDepth = DispatchGpuZoneLevel( tl, hover, pxns, int64_t( nspx ), wpos, offset, 0, thread, &gpu, yMin, yMax, begin, drift );
                 if( partDepth != 0 )
                 {
                     if( !singleThread )