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