mirror of
https://github.com/ncblakely/GiantsTools
synced 2024-11-25 07:35:36 +01:00
49 lines
1.2 KiB
C++
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;
|
|
}
|
|
}
|