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/*
* Copyright 2019-2021 Diligent Graphics LLC
* Copyright 2015-2019 Egor Yusov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* In no event and under no legal theory, whether in tort (including negligence),
* contract, or otherwise, unless required by applicable law (such as deliberate
* and grossly negligent acts) or agreed to in writing, shall any Contributor be
* liable for any damages, including any direct, indirect, special, incidental,
* or consequential damages of any character arising as a result of this License or
* out of the use or inability to use the software (including but not limited to damages
* for loss of goodwill, work stoppage, computer failure or malfunction, or any and
* all other commercial damages or losses), even if such Contributor has been advised
* of the possibility of such damages.
*/
#pragma once
#include <vector>
#include <deque>
#include "../../GraphicsEngine/interface/RenderDevice.h"
#include "../../GraphicsEngine/interface/DeviceContext.h"
#include "../../GraphicsEngine/interface/Query.h"
#include "../../../Common/interface/RefCntAutoPtr.hpp"
namespace Diligent
{
/// Helper class to manage duration queries.
/// One DurationQueryHelper instance must be used once per frame.
class DurationQueryHelper
{
public:
DurationQueryHelper(IRenderDevice* pDevice,
Uint32 NumQueriesToReserve,
Uint32 ExpectedQueryLimit = 5);
// clang-format off
DurationQueryHelper (const DurationQueryHelper&) = delete;
DurationQueryHelper& operator=(const DurationQueryHelper&) = delete;
DurationQueryHelper (DurationQueryHelper&&) = default;
DurationQueryHelper& operator=(DurationQueryHelper&&) = delete;
// clang-format on
/// Begins a query.
/// \param [in] pCtx - Context to record begin query command
///
/// \remarks There must be exaclty one matching Begin() for every End() call, otherwise
/// the behavior is undefined.
void Begin(IDeviceContext* pCtx);
/// Ends a query and returns the duration, in seconds, if it is available.
/// \param [in] pCtx - Context to record end query command.
/// \param [out] Duration - Variable where duration will be written to.
/// \return true if the data from the oldest query is available, and false otherwise.
///
/// \remarks There must be exaclty one matching End() for every Begin() call, otherwise
/// the behavior is undefined.
bool End(IDeviceContext* pCtx, double& Duration);
private:
RefCntAutoPtr<IRenderDevice> m_pDevice;
const Uint32 m_ExpectedQueryLimit;
struct DurationQuery
{
DurationQuery(IRenderDevice* pDevice);
// clang-format off
DurationQuery (const DurationQuery&) = delete;
DurationQuery& operator=(const DurationQuery&) = delete;
DurationQuery (DurationQuery&&) = default;
DurationQuery& operator=(DurationQuery&&) = default;
// clang-format on
RefCntAutoPtr<IQuery> StartTimestamp;
RefCntAutoPtr<IQuery> EndTimestamp;
};
void InitDurationQuery(DurationQuery& query);
std::deque<DurationQuery> m_PendingQueries;
std::vector<DurationQuery> m_AvailableQueries;
};
} // namespace Diligent
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