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-rw-r--r--src/input_common/motion_emu.cpp168
1 files changed, 168 insertions, 0 deletions
diff --git a/src/input_common/motion_emu.cpp b/src/input_common/motion_emu.cpp
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+++ b/src/input_common/motion_emu.cpp
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+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <chrono>
+#include <mutex>
+#include <thread>
+#include <tuple>
+#include "common/math_util.h"
+#include "common/quaternion.h"
+#include "common/thread.h"
+#include "common/vector_math.h"
+#include "input_common/motion_emu.h"
+
+namespace InputCommon {
+
+// Implementation class of the motion emulation device
+class MotionEmuDevice {
+public:
+ MotionEmuDevice(int update_millisecond, float sensitivity)
+ : update_millisecond(update_millisecond),
+ update_duration(std::chrono::duration_cast<std::chrono::steady_clock::duration>(
+ std::chrono::milliseconds(update_millisecond))),
+ sensitivity(sensitivity), motion_emu_thread(&MotionEmuDevice::MotionEmuThread, this) {}
+
+ ~MotionEmuDevice() {
+ if (motion_emu_thread.joinable()) {
+ shutdown_event.Set();
+ motion_emu_thread.join();
+ }
+ }
+
+ void BeginTilt(int x, int y) {
+ mouse_origin = Math::MakeVec(x, y);
+ is_tilting = true;
+ }
+
+ void Tilt(int x, int y) {
+ auto mouse_move = Math::MakeVec(x, y) - mouse_origin;
+ if (is_tilting) {
+ std::lock_guard<std::mutex> guard(tilt_mutex);
+ if (mouse_move.x == 0 && mouse_move.y == 0) {
+ tilt_angle = 0;
+ } else {
+ tilt_direction = mouse_move.Cast<float>();
+ tilt_angle = MathUtil::Clamp(tilt_direction.Normalize() * sensitivity, 0.0f,
+ MathUtil::PI * 0.5f);
+ }
+ }
+ }
+
+ void EndTilt() {
+ std::lock_guard<std::mutex> guard(tilt_mutex);
+ tilt_angle = 0;
+ is_tilting = false;
+ }
+
+ std::tuple<Math::Vec3<float>, Math::Vec3<float>> GetStatus() {
+ std::lock_guard<std::mutex> guard(status_mutex);
+ return status;
+ }
+
+private:
+ const int update_millisecond;
+ const std::chrono::steady_clock::duration update_duration;
+ const float sensitivity;
+
+ Math::Vec2<int> mouse_origin;
+
+ std::mutex tilt_mutex;
+ Math::Vec2<float> tilt_direction;
+ float tilt_angle = 0;
+
+ bool is_tilting = false;
+
+ Common::Event shutdown_event;
+
+ std::tuple<Math::Vec3<float>, Math::Vec3<float>> status;
+ std::mutex status_mutex;
+
+ // Note: always keep the thread declaration at the end so that other objects are initialized
+ // before this!
+ std::thread motion_emu_thread;
+
+ void MotionEmuThread() {
+ auto update_time = std::chrono::steady_clock::now();
+ Math::Quaternion<float> q = MakeQuaternion(Math::Vec3<float>(), 0);
+ Math::Quaternion<float> old_q;
+
+ while (!shutdown_event.WaitUntil(update_time)) {
+ update_time += update_duration;
+ old_q = q;
+
+ {
+ std::lock_guard<std::mutex> guard(tilt_mutex);
+
+ // Find the quaternion describing current 3DS tilting
+ q = MakeQuaternion(Math::MakeVec(-tilt_direction.y, 0.0f, tilt_direction.x),
+ tilt_angle);
+ }
+
+ auto inv_q = q.Inverse();
+
+ // Set the gravity vector in world space
+ auto gravity = Math::MakeVec(0.0f, -1.0f, 0.0f);
+
+ // Find the angular rate vector in world space
+ auto angular_rate = ((q - old_q) * inv_q).xyz * 2;
+ angular_rate *= 1000 / update_millisecond / MathUtil::PI * 180;
+
+ // Transform the two vectors from world space to 3DS space
+ gravity = QuaternionRotate(inv_q, gravity);
+ angular_rate = QuaternionRotate(inv_q, angular_rate);
+
+ // Update the sensor state
+ {
+ std::lock_guard<std::mutex> guard(status_mutex);
+ status = std::make_tuple(gravity, angular_rate);
+ }
+ }
+ }
+};
+
+// Interface wrapper held by input receiver as a unique_ptr. It holds the implementation class as
+// a shared_ptr, which is also observed by the factory class as a weak_ptr. In this way the factory
+// can forward all the inputs to the implementation only when it is valid.
+class MotionEmuDeviceWrapper : public Input::MotionDevice {
+public:
+ MotionEmuDeviceWrapper(int update_millisecond, float sensitivity) {
+ device = std::make_shared<MotionEmuDevice>(update_millisecond, sensitivity);
+ }
+
+ std::tuple<Math::Vec3<float>, Math::Vec3<float>> GetStatus() const {
+ return device->GetStatus();
+ }
+
+ std::shared_ptr<MotionEmuDevice> device;
+};
+
+std::unique_ptr<Input::MotionDevice> MotionEmu::Create(const Common::ParamPackage& params) {
+ int update_period = params.Get("update_period", 100);
+ float sensitivity = params.Get("sensitivity", 0.01f);
+ auto device_wrapper = std::make_unique<MotionEmuDeviceWrapper>(update_period, sensitivity);
+ // Previously created device is disconnected here. Having two motion devices for 3DS is not
+ // expected.
+ current_device = device_wrapper->device;
+ return std::move(device_wrapper);
+}
+
+void MotionEmu::BeginTilt(int x, int y) {
+ if (auto ptr = current_device.lock()) {
+ ptr->BeginTilt(x, y);
+ }
+}
+
+void MotionEmu::Tilt(int x, int y) {
+ if (auto ptr = current_device.lock()) {
+ ptr->Tilt(x, y);
+ }
+}
+
+void MotionEmu::EndTilt() {
+ if (auto ptr = current_device.lock()) {
+ ptr->EndTilt();
+ }
+}
+
+} // namespace InputCommon