GteDX11PerformanceCounter.h

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// David Eberly, Geometric Tools, Redmond WA 98052
// Copyright (c) 1998-2017
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
// File Version: 3.0.0 (2016/06/19)

#pragma once

#include <Graphics/DX11/GteDX11Include.h>

namespace gte
{

// Support for coarse-level GPU timing.

class GTE_IMPEXP DX11PerformanceCounter
{
public:
    // Construction and destruction.
    ~DX11PerformanceCounter();
    DX11PerformanceCounter(ID3D11Device* device);

    // Performance measurements.
    int64_t GetTicks() const;
    double GetSeconds() const;

    // Get the time for the specified number of ticks.
    double GetSeconds(int64_t numTicks) const;

    // Get the number of ticks for the specified time.
    int64_t GetTicks(double seconds) const;

    // For average performance measurements.
    void ResetAccumulateTime();
    void AccumulateTime();
    double GetAverageSeconds() const;
    unsigned int GetNumMeasurements() const;

private:
    // Allow the engine to access the members directly to avoid exposing
    // internals via the public interface.
    friend class DX11Engine;

    D3D11_QUERY_DATA_TIMESTAMP_DISJOINT mTimeStamp;
    ID3D11Query* mFrequencyQuery;
    ID3D11Query* mStartTimeQuery;
    ID3D11Query* mFinalTimeQuery;
    double mFrequency, mInvFrequency;
    int64_t mStartTime, mFinalTime;
    double mTotalSeconds;
    unsigned int mNumMeasurements;
};

}