// Copyright 2018 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <array>
#include <optional>
#include <type_traits>
#include <boost/crc.hpp>
#include "common/bit_field.h"
#include "common/swap.h"
namespace InputCommon::CemuhookUDP {
constexpr std::size_t MAX_PACKET_SIZE = 100;
constexpr u16 PROTOCOL_VERSION = 1001;
constexpr u32 CLIENT_MAGIC = 0x43555344; // DSUC (but flipped for LE)
constexpr u32 SERVER_MAGIC = 0x53555344; // DSUS (but flipped for LE)
enum class Type : u32 {
Version = 0x00100000,
PortInfo = 0x00100001,
PadData = 0x00100002,
};
struct Header {
u32_le magic{};
u16_le protocol_version{};
u16_le payload_length{};
u32_le crc{};
u32_le id{};
///> In the protocol, the type of the packet is not part of the header, but its convenient to
///> include in the header so the callee doesn't have to duplicate the type twice when building
///> the data
Type type{};
};
static_assert(sizeof(Header) == 20, "UDP Message Header struct has wrong size");
static_assert(std::is_trivially_copyable_v<Header>, "UDP Message Header is not trivially copyable");
using MacAddress = std::array<u8, 6>;
constexpr MacAddress EMPTY_MAC_ADDRESS = {0, 0, 0, 0, 0, 0};
#pragma pack(push, 1)
template <typename T>
struct Message {
Header header{};
T data;
};
#pragma pack(pop)
template <typename T>
constexpr Type GetMessageType();
namespace Request {
struct Version {};
/**
* Requests the server to send information about what controllers are plugged into the ports
* In citra's case, we only have one controller, so for simplicity's sake, we can just send a
* request explicitly for the first controller port and leave it at that. In the future it would be
* nice to make this configurable
*/
constexpr u32 MAX_PORTS = 4;
struct PortInfo {
u32_le pad_count{}; ///> Number of ports to request data for
std::array<u8, MAX_PORTS> port;
};
static_assert(std::is_trivially_copyable_v<PortInfo>,
"UDP Request PortInfo is not trivially copyable");
/**
* Request the latest pad information from the server. If the server hasn't received this message
* from the client in a reasonable time frame, the server will stop sending updates. The default
* timeout seems to be 5 seconds.
*/
struct PadData {
enum class Flags : u8 {
AllPorts,
Id,
Mac,
};
/// Determines which method will be used as a look up for the controller
Flags flags{};
/// Index of the port of the controller to retrieve data about
u8 port_id{};
/// Mac address of the controller to retrieve data about
MacAddress mac;
};
static_assert(sizeof(PadData) == 8, "UDP Request PadData struct has wrong size");
static_assert(std::is_trivially_copyable_v<PadData>,
"UDP Request PadData is not trivially copyable");
/**
* Creates a message with the proper header data that can be sent to the server.
* @param data Request body to send
* @param client_id ID of the udp client (usually not checked on the server)
*/
template <typename T>
Message<T> Create(const T data, const u32 client_id = 0) {
boost::crc_32_type crc;
Header header{
CLIENT_MAGIC, PROTOCOL_VERSION, sizeof(T) + sizeof(Type), 0, client_id, GetMessageType<T>(),
};
Message<T> message{header, data};
crc.process_bytes(&message, sizeof(Message<T>));
message.header.crc = crc.checksum();
return message;
}
} // namespace Request
namespace Response {
struct Version {
u16_le version{};
};
static_assert(sizeof(Version) == 2, "UDP Response Version struct has wrong size");
static_assert(std::is_trivially_copyable_v<Version>,
"UDP Response Version is not trivially copyable");
struct PortInfo {
u8 id{};
u8 state{};
u8 model{};
u8 connection_type{};
MacAddress mac;
u8 battery{};
u8 is_pad_active{};
};
static_assert(sizeof(PortInfo) == 12, "UDP Response PortInfo struct has wrong size");
static_assert(std::is_trivially_copyable_v<PortInfo>,
"UDP Response PortInfo is not trivially copyable");
struct TouchPad {
u8 is_active{};
u8 id{};
u16_le x{};
u16_le y{};
};
static_assert(sizeof(TouchPad) == 6, "UDP Response TouchPad struct has wrong size ");
#pragma pack(push, 1)
struct PadData {
PortInfo info{};
u32_le packet_counter{};
u16_le digital_button{};
// The following union isn't trivially copyable but we don't use this input anyway.
// union DigitalButton {
// u16_le button;
// BitField<0, 1, u16> button_1; // Share
// BitField<1, 1, u16> button_2; // L3
// BitField<2, 1, u16> button_3; // R3
// BitField<3, 1, u16> button_4; // Options
// BitField<4, 1, u16> button_5; // Up
// BitField<5, 1, u16> button_6; // Right
// BitField<6, 1, u16> button_7; // Down
// BitField<7, 1, u16> button_8; // Left
// BitField<8, 1, u16> button_9; // L2
// BitField<9, 1, u16> button_10; // R2
// BitField<10, 1, u16> button_11; // L1
// BitField<11, 1, u16> button_12; // R1
// BitField<12, 1, u16> button_13; // Triangle
// BitField<13, 1, u16> button_14; // Circle
// BitField<14, 1, u16> button_15; // Cross
// BitField<15, 1, u16> button_16; // Square
// } digital_button;
u8 home;
/// If the device supports a "click" on the touchpad, this will change to 1 when a click happens
u8 touch_hard_press{};
u8 left_stick_x{};
u8 left_stick_y{};
u8 right_stick_x{};
u8 right_stick_y{};
struct AnalogButton {
u8 button_8{};
u8 button_7{};
u8 button_6{};
u8 button_5{};
u8 button_12{};
u8 button_11{};
u8 button_10{};
u8 button_9{};
u8 button_16{};
u8 button_15{};
u8 button_14{};
u8 button_13{};
} analog_button;
std::array<TouchPad, 2> touch;
u64_le motion_timestamp;
struct Accelerometer {
float x{};
float y{};
float z{};
} accel;
struct Gyroscope {
float pitch{};
float yaw{};
float roll{};
} gyro;
};
#pragma pack(pop)
static_assert(sizeof(PadData) == 80, "UDP Response PadData struct has wrong size ");
static_assert(std::is_trivially_copyable_v<PadData>,
"UDP Response PadData is not trivially copyable");
static_assert(sizeof(Message<PadData>) == MAX_PACKET_SIZE,
"UDP MAX_PACKET_SIZE is no longer larger than Message<PadData>");
static_assert(sizeof(PadData::AnalogButton) == 12,
"UDP Response AnalogButton struct has wrong size ");
static_assert(sizeof(PadData::Accelerometer) == 12,
"UDP Response Accelerometer struct has wrong size ");
static_assert(sizeof(PadData::Gyroscope) == 12, "UDP Response Gyroscope struct has wrong size ");
/**
* Create a Response Message from the data
* @param data array of bytes sent from the server
* @return boost::none if it failed to parse or Type if it succeeded. The client can then safely
* copy the data into the appropriate struct for that Type
*/
std::optional<Type> Validate(u8* data, std::size_t size);
} // namespace Response
template <>
constexpr Type GetMessageType<Request::Version>() {
return Type::Version;
}
template <>
constexpr Type GetMessageType<Request::PortInfo>() {
return Type::PortInfo;
}
template <>
constexpr Type GetMessageType<Request::PadData>() {
return Type::PadData;
}
template <>
constexpr Type GetMessageType<Response::Version>() {
return Type::Version;
}
template <>
constexpr Type GetMessageType<Response::PortInfo>() {
return Type::PortInfo;
}
template <>
constexpr Type GetMessageType<Response::PadData>() {
return Type::PadData;
}
} // namespace InputCommon::CemuhookUDP
