1 files changed, 229 insertions, 0 deletions
diff --git a/src/input_common/input_engine.h b/src/input_common/input_engine.h
new file mode 100644
index 000000000..390581c94
--- /dev/null
+++ b/src/input_common/input_engine.h
@@ -0,0 +1,229 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included
+
+#pragma once
+
+#include <functional>
+#include <mutex>
+#include <unordered_map>
+
+#include "common/common_types.h"
+#include "common/input.h"
+#include "common/param_package.h"
+#include "common/uuid.h"
+#include "input_common/main.h"
+
+// Pad Identifier of data source
+struct PadIdentifier {
+    Common::UUID guid{};
+    std::size_t port{};
+    std::size_t pad{};
+
+    friend constexpr bool operator==(const PadIdentifier&, const PadIdentifier&) = default;
+};
+
+// Basic motion data containing data from the sensors and a timestamp in microseconds
+struct BasicMotion {
+    float gyro_x{};
+    float gyro_y{};
+    float gyro_z{};
+    float accel_x{};
+    float accel_y{};
+    float accel_z{};
+    u64 delta_timestamp{};
+};
+
+// Stages of a battery charge
+enum class BatteryLevel {
+    Empty,
+    Critical,
+    Low,
+    Medium,
+    Full,
+    Charging,
+};
+
+// Types of input that are stored in the engine
+enum class EngineInputType {
+    None,
+    Button,
+    HatButton,
+    Analog,
+    Motion,
+    Battery,
+};
+
+namespace std {
+// Hash used to create lists from PadIdentifier data
+template <>
+struct hash<PadIdentifier> {
+    size_t operator()(const PadIdentifier& pad_id) const noexcept {
+        u64 hash_value = pad_id.guid.uuid[1] ^ pad_id.guid.uuid[0];
+        hash_value ^= (static_cast<u64>(pad_id.port) << 32);
+        hash_value ^= static_cast<u64>(pad_id.pad);
+        return static_cast<size_t>(hash_value);
+    }
+};
+
+} // namespace std
+
+namespace InputCommon {
+
+// Data from the engine and device needed for creating a ParamPackage
+struct MappingData {
+    std::string engine{};
+    PadIdentifier pad{};
+    EngineInputType type{};
+    int index{};
+    bool button_value{};
+    std::string hat_name{};
+    f32 axis_value{};
+    BasicMotion motion_value{};
+};
+
+// Triggered if data changed on the controller
+struct UpdateCallback {
+    std::function<void()> on_change;
+};
+
+// Triggered if data changed on the controller and the engine is on configuring mode
+struct MappingCallback {
+    std::function<void(MappingData)> on_data;
+};
+
+// Input Identifier of data source
+struct InputIdentifier {
+    PadIdentifier identifier;
+    EngineInputType type;
+    int index;
+    UpdateCallback callback;
+};
+
+class InputEngine {
+public:
+    explicit InputEngine(std::string input_engine_) : input_engine{std::move(input_engine_)} {}
+
+    virtual ~InputEngine() = default;
+
+    // Enable configuring mode for mapping
+    void BeginConfiguration();
+
+    // Disable configuring mode for mapping
+    void EndConfiguration();
+
+    // Sets a led pattern for a controller
+    virtual void SetLeds([[maybe_unused]] const PadIdentifier& identifier,
+                         [[maybe_unused]] const Common::Input::LedStatus& led_status) {}
+
+    // Sets rumble to a controller
+    virtual Common::Input::VibrationError SetRumble(
+        [[maybe_unused]] const PadIdentifier& identifier,
+        [[maybe_unused]] const Common::Input::VibrationStatus& vibration) {
+        return Common::Input::VibrationError::NotSupported;
+    }
+
+    // Sets polling mode to a controller
+    virtual Common::Input::PollingError SetPollingMode(
+        [[maybe_unused]] const PadIdentifier& identifier,
+        [[maybe_unused]] const Common::Input::PollingMode vibration) {
+        return Common::Input::PollingError::NotSupported;
+    }
+
+    // Returns the engine name
+    [[nodiscard]] const std::string& GetEngineName() const;
+
+    /// Used for automapping features
+    virtual std::vector<Common::ParamPackage> GetInputDevices() const {
+        return {};
+    }
+
+    /// Retrieves the button mappings for the given device
+    virtual ButtonMapping GetButtonMappingForDevice(
+        [[maybe_unused]] const Common::ParamPackage& params) {
+        return {};
+    }
+
+    /// Retrieves the analog mappings for the given device
+    virtual AnalogMapping GetAnalogMappingForDevice(
+        [[maybe_unused]] const Common::ParamPackage& params) {
+        return {};
+    }
+
+    /// Retrieves the motion mappings for the given device
+    virtual MotionMapping GetMotionMappingForDevice(
+        [[maybe_unused]] const Common::ParamPackage& params) {
+        return {};
+    }
+
+    /// Retrieves the name of the given input.
+    virtual Common::Input::ButtonNames GetUIName(
+        [[maybe_unused]] const Common::ParamPackage& params) const {
+        return Common::Input::ButtonNames::Engine;
+    }
+
+    /// Retrieves the index number of the given hat button direction
+    virtual u8 GetHatButtonId([[maybe_unused]] const std::string& direction_name) const {
+        return 0;
+    }
+
+    void PreSetController(const PadIdentifier& identifier);
+    void PreSetButton(const PadIdentifier& identifier, int button);
+    void PreSetHatButton(const PadIdentifier& identifier, int button);
+    void PreSetAxis(const PadIdentifier& identifier, int axis);
+    void PreSetMotion(const PadIdentifier& identifier, int motion);
+    void ResetButtonState();
+    void ResetAnalogState();
+
+    bool GetButton(const PadIdentifier& identifier, int button) const;
+    bool GetHatButton(const PadIdentifier& identifier, int button, u8 direction) const;
+    f32 GetAxis(const PadIdentifier& identifier, int axis) const;
+    BatteryLevel GetBattery(const PadIdentifier& identifier) const;
+    BasicMotion GetMotion(const PadIdentifier& identifier, int motion) const;
+
+    int SetCallback(InputIdentifier input_identifier);
+    void SetMappingCallback(MappingCallback callback);
+    void DeleteCallback(int key);
+
+protected:
+    void SetButton(const PadIdentifier& identifier, int button, bool value);
+    void SetHatButton(const PadIdentifier& identifier, int button, u8 value);
+    void SetAxis(const PadIdentifier& identifier, int axis, f32 value);
+    void SetBattery(const PadIdentifier& identifier, BatteryLevel value);
+    void SetMotion(const PadIdentifier& identifier, int motion, const BasicMotion& value);
+
+    virtual std::string GetHatButtonName([[maybe_unused]] u8 direction_value) const {
+        return "Unknown";
+    }
+
+private:
+    struct ControllerData {
+        std::unordered_map<int, bool> buttons;
+        std::unordered_map<int, u8> hat_buttons;
+        std::unordered_map<int, float> axes;
+        std::unordered_map<int, BasicMotion> motions;
+        BatteryLevel battery{};
+    };
+
+    void TriggerOnButtonChange(const PadIdentifier& identifier, int button, bool value);
+    void TriggerOnHatButtonChange(const PadIdentifier& identifier, int button, u8 value);
+    void TriggerOnAxisChange(const PadIdentifier& identifier, int axis, f32 value);
+    void TriggerOnBatteryChange(const PadIdentifier& identifier, BatteryLevel value);
+    void TriggerOnMotionChange(const PadIdentifier& identifier, int motion,
+                               const BasicMotion& value);
+
+    bool IsInputIdentifierEqual(const InputIdentifier& input_identifier,
+                                const PadIdentifier& identifier, EngineInputType type,
+                                int index) const;
+
+    mutable std::mutex mutex;
+    mutable std::mutex mutex_callback;
+    bool configuring{false};
+    const std::string input_engine;
+    int last_callback_key = 0;
+    std::unordered_map<PadIdentifier, ControllerData> controller_list;
+    std::unordered_map<int, InputIdentifier> callback_list;
+    MappingCallback mapping_callback;
+};
+
+} // namespace InputCommon