ATOM-13791 Editor: ImGui profiling tools doesn't work correctly due to disabled RenderPipelines

- Added pause/resume button to ImGui Profiler to pause/resume profiling
- Added showing pass execution timeline
- Change TimestampResult to include both begin tick and duration tick. Update some function names of TimestampResult.
- Update some functions names in Pass.
- Stop showing accumulated time for ParentPass.
- Fixed a crash issue with ImGuiManager which doesn't have default font.

Gems/Atom/RPI/Code/Source/RPI.Public/GpuQuery/GpuQueryTypes.cpp

@@ -21,41 +21,39 @@ namespace AZ
     namespace RPI
     {
         // --- TimestampResult ---
-
-        TimestampResult::TimestampResult(uint64_t timestampInTicks)
+        TimestampResult::TimestampResult(uint64_t beginTick, uint64_t endTick, RHI::HardwareQueueClass hardwareQueueClass)
         {
-            m_timestampInTicks = timestampInTicks;
+            AZ_Assert(endTick >= beginTick, "TimestampResult: bad inputs");
+            m_begin = beginTick;
+            m_duration = endTick - beginTick;
+            m_hardwareQueueClass = hardwareQueueClass;
         }
 
-        TimestampResult::TimestampResult(uint64_t timestampQueryResultLow, uint64_t timestampQueryResultHigh)
-        {
-            const uint64_t low  = AZStd::min(timestampQueryResultLow, timestampQueryResultHigh);
-            const uint64_t high = AZStd::max(timestampQueryResultLow, timestampQueryResultHigh);
-
-            m_timestampInTicks = high - low;
-        }
-
-        TimestampResult::TimestampResult(AZStd::array_view<TimestampResult>&& timestampResultArray)
-        {
-            // Loop through all the child passes, and accumulate all the timestampTicks
-            for (const TimestampResult& timestampResult : timestampResultArray)
-            {
-                m_timestampInTicks += timestampResult.m_timestampInTicks;
-            }
-        }
-
-        uint64_t TimestampResult::GetTimestampInNanoseconds() const
+        uint64_t TimestampResult::GetDurationInNanoseconds() const
         {
             const RHI::Ptr<RHI::Device> device = RHI::GetRHIDevice();
-            const AZStd::chrono::microseconds timeInMicroseconds = device->GpuTimestampToMicroseconds(m_timestampInTicks, RHI::HardwareQueueClass::Graphics);
+            const AZStd::chrono::microseconds timeInMicroseconds = device->GpuTimestampToMicroseconds(m_duration, m_hardwareQueueClass);
             const auto timeInNanoseconds = AZStd::chrono::nanoseconds(timeInMicroseconds);
 
             return static_cast<uint64_t>(timeInNanoseconds.count());
         }
 
-        uint64_t TimestampResult::GetTimestampInTicks() const
+        uint64_t TimestampResult::GetDurationInTicks() const
         {
-            return m_timestampInTicks;
+            return m_duration;
+        }
+
+        uint64_t TimestampResult::GetTimestampBeginInTicks() const
+        {
+            return m_begin;
+        }
+
+        void TimestampResult::Add(const TimestampResult& extent)
+        {
+            uint64_t end1 = m_begin + m_duration;
+            uint64_t end2 = extent.m_begin + extent.m_duration;
+            m_begin = m_begin < extent.m_begin ? m_begin : extent.m_begin;
+            m_duration = (end1 > end2 ? end1 : end2) - m_begin;
         }
 
         // --- PipelineStatisticsResult ---

Gems/Atom/RPI/Code/Source/RPI.Public/Pass/ParentPass.cpp

@@ -393,19 +393,6 @@ namespace AZ
             }
         }
 
-        TimestampResult ParentPass::GetTimestampResultInternal() const
-        {
-            AZStd::vector<TimestampResult> timestampResultArray;
-            timestampResultArray.reserve(m_children.size());
-
-            // Calculate the Timestamp result by summing all of its child's TimestampResults
-            for (const Ptr<Pass>& childPass : m_children)
-            {
-                timestampResultArray.emplace_back(childPass->GetTimestampResult());
-            }
-            return TimestampResult(timestampResultArray);
-        }
-
         PipelineStatisticsResult ParentPass::GetPipelineStatisticsResultInternal() const
         {
             AZStd::vector<PipelineStatisticsResult> pipelineStatisticsResultArray;
@@ -414,7 +401,7 @@ namespace AZ
             // Calculate the PipelineStatistics result by summing all of its child's PipelineStatistics
             for (const Ptr<Pass>& childPass : m_children)
             {
-                pipelineStatisticsResultArray.emplace_back(childPass->GetPipelineStatisticsResult());
+                pipelineStatisticsResultArray.emplace_back(childPass->GetLatestPipelineStatisticsResult());
             }
             return PipelineStatisticsResult(pipelineStatisticsResultArray);
         }

Gems/Atom/RPI/Code/Source/RPI.Public/Pass/Pass.cpp

@@ -1273,24 +1273,14 @@ namespace AZ
             }
         }
 
-        TimestampResult Pass::GetTimestampResult() const
+        TimestampResult Pass::GetLatestTimestampResult() const
         {
-            if (IsEnabled() && IsTimestampQueryEnabled())
-            {
-                return GetTimestampResultInternal();
-            }
-
-            return TimestampResult();
+            return GetTimestampResultInternal();
         }
 
-        PipelineStatisticsResult Pass::GetPipelineStatisticsResult() const
+        PipelineStatisticsResult Pass::GetLatestPipelineStatisticsResult() const
         {
-            if (IsEnabled() && IsPipelineStatisticsQueryEnabled())
-            {
-                return GetPipelineStatisticsResultInternal();
-            }
-
-            return PipelineStatisticsResult();
+            return GetPipelineStatisticsResultInternal();
         }
 
         TimestampResult Pass::GetTimestampResultInternal() const

Gems/Atom/RPI/Code/Source/RPI.Public/Pass/RenderPass.cpp

@@ -539,7 +539,7 @@ namespace AZ
                 const uint32_t TimestampResultQueryCount = 2u;
                 uint64_t timestampResult[TimestampResultQueryCount] = {0};
                 query->GetLatestResult(&timestampResult, sizeof(uint64_t) * TimestampResultQueryCount);
-                m_timestampResult = TimestampResult(timestampResult[0], timestampResult[1]);
+                m_timestampResult = TimestampResult(timestampResult[0], timestampResult[1], RHI::HardwareQueueClass::Graphics);
             });
 
             ExecuteOnPipelineStatisticsQuery([this](RHI::Ptr<Query> query)