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vulkan_handle.h
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vulkan_handle.h
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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef FLUTTER_VULKAN_VULKAN_HANDLE_H_
#define FLUTTER_VULKAN_VULKAN_HANDLE_H_
#include <functional>
#include "flutter/fml/logging.h"
#include "flutter/fml/macros.h"
#include "vulkan_interface.h"
namespace vulkan {
template <class T>
class VulkanHandle {
public:
using Handle = T;
using Disposer = std::function<void(Handle)>;
VulkanHandle() : handle_(VK_NULL_HANDLE) {}
explicit VulkanHandle(Handle handle, const Disposer& disposer = nullptr)
: handle_(handle), disposer_(disposer) {}
VulkanHandle(VulkanHandle&& other)
: handle_(other.handle_), disposer_(other.disposer_) {
other.handle_ = VK_NULL_HANDLE;
other.disposer_ = nullptr;
}
~VulkanHandle() { DisposeIfNecessary(); }
VulkanHandle& operator=(VulkanHandle&& other) {
if (handle_ != other.handle_) {
DisposeIfNecessary();
}
handle_ = other.handle_;
disposer_ = other.disposer_;
other.handle_ = VK_NULL_HANDLE;
other.disposer_ = nullptr;
return *this;
}
explicit operator bool() const { return handle_ != VK_NULL_HANDLE; }
// NOLINTNEXTLINE(google-explicit-constructor)
operator Handle() const { return handle_; }
/// Relinquish responsibility of collecting the underlying handle when this
/// object is collected. It is the responsibility of the caller to ensure that
/// the lifetime of the handle extends past the lifetime of this object.
void ReleaseOwnership() { disposer_ = nullptr; }
void Reset() { DisposeIfNecessary(); }
private:
Handle handle_;
Disposer disposer_;
void DisposeIfNecessary() {
if (handle_ == VK_NULL_HANDLE) {
return;
}
if (disposer_) {
disposer_(handle_);
}
handle_ = VK_NULL_HANDLE;
disposer_ = nullptr;
}
FML_DISALLOW_COPY_AND_ASSIGN(VulkanHandle);
};
} // namespace vulkan
#endif // FLUTTER_VULKAN_VULKAN_HANDLE_H_