Input: UDP Client to provide motion and touch controls

An implementation of the cemuhook motion/touch protocol, this adds the
ability for users to connect several different devices to citra to send
direct motion and touch data to citra.

Co-Authored-By: jroweboy <jroweboy@gmail.com>

src/input_common/udp/udp.cpp

@@ -0,0 +1,96 @@
+// Copyright 2018 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/logging/log.h"
+#include "common/param_package.h"
+#include "core/frontend/input.h"
+#include "core/settings.h"
+#include "input_common/udp/client.h"
+#include "input_common/udp/udp.h"
+
+namespace InputCommon::CemuhookUDP {
+
+class UDPTouchDevice final : public Input::TouchDevice {
+public:
+    explicit UDPTouchDevice(std::shared_ptr<DeviceStatus> status_) : status(std::move(status_)) {}
+    std::tuple<float, float, bool> GetStatus() const {
+        std::lock_guard guard(status->update_mutex);
+        return status->touch_status;
+    }
+
+private:
+    std::shared_ptr<DeviceStatus> status;
+};
+
+class UDPMotionDevice final : public Input::MotionDevice {
+public:
+    explicit UDPMotionDevice(std::shared_ptr<DeviceStatus> status_) : status(std::move(status_)) {}
+    std::tuple<Common::Vec3<float>, Common::Vec3<float>> GetStatus() const {
+        std::lock_guard guard(status->update_mutex);
+        return status->motion_status;
+    }
+
+private:
+    std::shared_ptr<DeviceStatus> status;
+};
+
+class UDPTouchFactory final : public Input::Factory<Input::TouchDevice> {
+public:
+    explicit UDPTouchFactory(std::shared_ptr<DeviceStatus> status_) : status(std::move(status_)) {}
+
+    std::unique_ptr<Input::TouchDevice> Create(const Common::ParamPackage& params) override {
+        {
+            std::lock_guard guard(status->update_mutex);
+            status->touch_calibration.emplace();
+            // These default values work well for DS4 but probably not other touch inputs
+            status->touch_calibration->min_x = params.Get("min_x", 100);
+            status->touch_calibration->min_y = params.Get("min_y", 50);
+            status->touch_calibration->max_x = params.Get("max_x", 1800);
+            status->touch_calibration->max_y = params.Get("max_y", 850);
+        }
+        return std::make_unique<UDPTouchDevice>(status);
+    }
+
+private:
+    std::shared_ptr<DeviceStatus> status;
+};
+
+class UDPMotionFactory final : public Input::Factory<Input::MotionDevice> {
+public:
+    explicit UDPMotionFactory(std::shared_ptr<DeviceStatus> status_) : status(std::move(status_)) {}
+
+    std::unique_ptr<Input::MotionDevice> Create(const Common::ParamPackage& params) override {
+        return std::make_unique<UDPMotionDevice>(status);
+    }
+
+private:
+    std::shared_ptr<DeviceStatus> status;
+};
+
+State::State() {
+    auto status = std::make_shared<DeviceStatus>();
+    client =
+        std::make_unique<Client>(status, Settings::values.udp_input_address,
+                                 Settings::values.udp_input_port, Settings::values.udp_pad_index);
+
+    Input::RegisterFactory<Input::TouchDevice>("cemuhookudp",
+                                               std::make_shared<UDPTouchFactory>(status));
+    Input::RegisterFactory<Input::MotionDevice>("cemuhookudp",
+                                                std::make_shared<UDPMotionFactory>(status));
+}
+
+State::~State() {
+    Input::UnregisterFactory<Input::TouchDevice>("cemuhookudp");
+    Input::UnregisterFactory<Input::MotionDevice>("cemuhookudp");
+}
+
+void State::ReloadUDPClient() {
+    client->ReloadSocket(Settings::values.udp_input_address, Settings::values.udp_input_port,
+                         Settings::values.udp_pad_index);
+}
+
+std::unique_ptr<State> Init() {
+    return std::make_unique<State>();
+}
+} // namespace InputCommon::CemuhookUDP