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GiantsTools/Sdk/External/DirectXTK/Src/DemandCreate.h
2021-01-23 15:40:09 -08:00

49 lines
1.2 KiB
C++

//--------------------------------------------------------------------------------------
// File: DemandCreate.h
//
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
//
// http://go.microsoft.com/fwlink/?LinkId=248929
// http://go.microsoft.com/fwlink/?LinkID=615561
//--------------------------------------------------------------------------------------
#pragma once
#include "PlatformHelpers.h"
namespace DirectX
{
// Helper for lazily creating a D3D resource.
template<typename T, typename TCreateFunc>
inline T* DemandCreate(Microsoft::WRL::ComPtr<T>& comPtr, std::mutex& mutex, TCreateFunc createFunc)
{
T* result = comPtr.Get();
// Double-checked lock pattern.
MemoryBarrier();
if (!result)
{
std::lock_guard<std::mutex> lock(mutex);
result = comPtr.Get();
if (!result)
{
// Create the new object.
ThrowIfFailed(
createFunc(&result)
);
MemoryBarrier();
comPtr.Attach(result);
}
}
return result;
}
}