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Source/Engine/Graphics/GPUTimerQuery.h

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+// Copyright (c) 2012-2020 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#include "GPUResource.h"
+
+/// <summary>
+/// Represents a GPU query that measures execution time of GPU operations.
+/// The query will measure any GPU operations that take place between its Begin() and End() calls.
+/// </summary>
+/// <seealso cref="GPUResource" />
+class FLAXENGINE_API GPUTimerQuery : public GPUResource
+{
+public:
+
+    /// <summary>
+    /// Finalizes an instance of the <see cref="GPUTimerQuery"/> class.
+    /// </summary>
+    virtual ~GPUTimerQuery()
+    {
+    }
+
+public:
+
+    /// <summary>
+    /// Starts the counter.
+    /// </summary>
+    virtual void Begin() = 0;
+
+    /// <summary>
+    /// Stops the counter. Can be called more than once without failing.
+    /// </summary>
+    virtual void End() = 0;
+
+    /// <summary>
+    /// Determines whether this query has been completed and has valid result to gather.
+    /// </summary>
+    /// <returns><c>true</c> if this query has result; otherwise, <c>false</c>.</returns>
+    virtual bool HasResult() = 0;
+
+    /// <summary>
+    /// Gets the query result time (in milliseconds) it took to execute GPU commands between Begin/End calls.
+    /// </summary>
+    /// <returns>The time in milliseconds.</returns>
+    virtual float GetResult() = 0;
+
+public:
+
+    // [GPUResource]
+    String ToString() const override
+    {
+        return TEXT("TimerQuery");
+    }
+
+    ResourceType GetResourceType() const final override
+    {
+        return ResourceType::Query;
+    }
+
+    ObjectType GetObjectType() const final override
+    {
+        return ObjectType::Other;
+    }
+};