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90 lines
2.8 KiB
C++
90 lines
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// This file defines a strongly-typed opaque gamepad handle
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//
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// The handle is designed to be copied around and passed over IPC. It keeps
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// track of which "provider" created the handle so it can ensure that
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// providers are never mixed. It also allows each provider to have its own
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// algorithm for generating gamepad IDs, since the VR and Platform services
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// do it differently.
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#ifndef mozilla_dom_gamepad_GamepadHandle_h
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#define mozilla_dom_gamepad_GamepadHandle_h
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#include "PLDHashTable.h"
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#include <type_traits>
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#include <cinttypes>
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namespace IPC {
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template <class>
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struct ParamTraits;
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} // namespace IPC
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namespace mozilla::gfx {
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class VRDisplayClient;
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class VRManager;
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} // namespace mozilla::gfx
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namespace mozilla::dom {
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class GamepadPlatformService;
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class GamepadServiceTest;
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class XRInputSource;
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// The "kind" of a gamepad handle is based on which provider created it
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enum class GamepadHandleKind : uint8_t {
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GamepadPlatformManager,
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VR,
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};
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class GamepadHandle {
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public:
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// Allow handle to be passed around as a simple object
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GamepadHandle() = default;
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GamepadHandle(const GamepadHandle&) = default;
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GamepadHandle& operator=(const GamepadHandle&) = default;
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// Helps code know which manager to send requests to
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GamepadHandleKind GetKind() const;
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// Define operators so the handle can compared and stored in maps
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friend bool operator==(const GamepadHandle& a, const GamepadHandle& b);
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friend bool operator!=(const GamepadHandle& a, const GamepadHandle& b);
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friend bool operator<(const GamepadHandle& a, const GamepadHandle& b);
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PLDHashNumber Hash() const;
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private:
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explicit GamepadHandle(uint32_t aValue, GamepadHandleKind aKind);
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uint32_t GetValue() const { return mValue; }
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uint32_t mValue{0};
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GamepadHandleKind mKind{GamepadHandleKind::GamepadPlatformManager};
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// These are the classes that are "gamepad managers". They are allowed to
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// create new handles and inspect their actual value
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friend class mozilla::dom::GamepadPlatformService;
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friend class mozilla::dom::GamepadServiceTest;
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friend class mozilla::dom::XRInputSource;
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friend class mozilla::gfx::VRDisplayClient;
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friend class mozilla::gfx::VRManager;
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// Allow IPDL to serialize us
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friend struct IPC::ParamTraits<mozilla::dom::GamepadHandle>;
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};
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static_assert(std::is_trivially_copyable<GamepadHandle>::value,
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"GamepadHandle must be trivially copyable");
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} // namespace mozilla::dom
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#endif // mozilla_dom_gamepad_GamepadHandle_h
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