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90 lines
2.8 KiB
C++
90 lines
2.8 KiB
C++
// Copyright 2016 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include "common/math_util.h"
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#include "common/quaternion.h"
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#include "core/frontend/emu_window.h"
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#include "core/frontend/motion_emu.h"
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namespace Motion {
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static constexpr int update_millisecond = 100;
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static constexpr auto update_duration =
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std::chrono::duration_cast<std::chrono::steady_clock::duration>(
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std::chrono::milliseconds(update_millisecond));
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MotionEmu::MotionEmu(EmuWindow& emu_window)
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: motion_emu_thread(&MotionEmu::MotionEmuThread, this, std::ref(emu_window)) {}
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MotionEmu::~MotionEmu() {
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if (motion_emu_thread.joinable()) {
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shutdown_event.Set();
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motion_emu_thread.join();
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}
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}
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void MotionEmu::MotionEmuThread(EmuWindow& emu_window) {
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auto update_time = std::chrono::steady_clock::now();
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Math::Quaternion<float> q = MakeQuaternion(Math::Vec3<float>(), 0);
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Math::Quaternion<float> old_q;
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while (!shutdown_event.WaitUntil(update_time)) {
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update_time += update_duration;
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old_q = q;
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{
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std::lock_guard<std::mutex> guard(tilt_mutex);
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// Find the quaternion describing current 3DS tilting
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q = MakeQuaternion(Math::MakeVec(-tilt_direction.y, 0.0f, tilt_direction.x),
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tilt_angle);
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}
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auto inv_q = q.Inverse();
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// Set the gravity vector in world space
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auto gravity = Math::MakeVec(0.0f, -1.0f, 0.0f);
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// Find the angular rate vector in world space
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auto angular_rate = ((q - old_q) * inv_q).xyz * 2;
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angular_rate *= 1000 / update_millisecond / MathUtil::PI * 180;
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// Transform the two vectors from world space to 3DS space
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gravity = QuaternionRotate(inv_q, gravity);
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angular_rate = QuaternionRotate(inv_q, angular_rate);
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// Update the sensor state
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emu_window.AccelerometerChanged(gravity.x, gravity.y, gravity.z);
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emu_window.GyroscopeChanged(angular_rate.x, angular_rate.y, angular_rate.z);
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}
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}
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void MotionEmu::BeginTilt(int x, int y) {
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mouse_origin = Math::MakeVec(x, y);
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is_tilting = true;
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}
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void MotionEmu::Tilt(int x, int y) {
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constexpr float SENSITIVITY = 0.01f;
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auto mouse_move = Math::MakeVec(x, y) - mouse_origin;
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if (is_tilting) {
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std::lock_guard<std::mutex> guard(tilt_mutex);
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if (mouse_move.x == 0 && mouse_move.y == 0) {
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tilt_angle = 0;
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} else {
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tilt_direction = mouse_move.Cast<float>();
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tilt_angle = MathUtil::Clamp(tilt_direction.Normalize() * SENSITIVITY, 0.0f,
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MathUtil::PI * 0.5f);
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}
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}
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}
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void MotionEmu::EndTilt() {
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std::lock_guard<std::mutex> guard(tilt_mutex);
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tilt_angle = 0;
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is_tilting = false;
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}
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} // namespace Motion
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