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// Copyright 2017 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <atomic>
#include <chrono>
#include <cmath>
#include <thread>
#include "common/math_util.h"
#include "core/settings.h"
#include "input_common/analog_from_button.h"
namespace InputCommon {
class Analog final : public Input::AnalogDevice {
public:
using Button = std::unique_ptr<Input::ButtonDevice>;
Analog(Button up_, Button down_, Button left_, Button right_, Button modifier_,
float modifier_scale_, float modifier_angle_)
: up(std::move(up_)), down(std::move(down_)), left(std::move(left_)),
right(std::move(right_)), modifier(std::move(modifier_)), modifier_scale(modifier_scale_),
modifier_angle(modifier_angle_) {
update_thread_running.store(true);
update_thread = std::thread(&Analog::UpdateStatus, this);
}
~Analog() override {
if (update_thread_running.load()) {
update_thread_running.store(false);
if (update_thread.joinable()) {
update_thread.join();
}
}
}
void MoveToDirection(bool enable, float to_angle) {
if (!enable) {
return;
}
constexpr float TAU = Common::PI * 2.0f;
// Use wider angle to ease the transition.
constexpr float aperture = TAU * 0.15f;
const float top_limit = to_angle + aperture;
const float bottom_limit = to_angle - aperture;
if ((angle > to_angle && angle <= top_limit) ||
(angle + TAU > to_angle && angle + TAU <= top_limit)) {
angle -= modifier_angle;
if (angle < 0) {
angle += TAU;
}
} else if ((angle >= bottom_limit && angle < to_angle) ||
(angle - TAU >= bottom_limit && angle - TAU < to_angle)) {
angle += modifier_angle;
if (angle >= TAU) {
angle -= TAU;
}
} else {
angle = to_angle;
}
}
void UpdateStatus() {
while (update_thread_running.load()) {
const float coef = modifier->GetStatus() ? modifier_scale : 1.0f;
bool r = right->GetStatus();
bool l = left->GetStatus();
bool u = up->GetStatus();
bool d = down->GetStatus();
// Eliminate contradictory movements
if (r && l) {
r = false;
l = false;
}
if (u && d) {
u = false;
d = false;
}
// Move to the right
MoveToDirection(r && !u && !d, 0.0f);
// Move to the upper right
MoveToDirection(r && u && !d, Common::PI * 0.25f);
// Move up
MoveToDirection(u && !l && !r, Common::PI * 0.5f);
// Move to the upper left
MoveToDirection(l && u && !d, Common::PI * 0.75f);
// Move to the left
MoveToDirection(l && !u && !d, Common::PI);
// Move to the bottom left
MoveToDirection(l && !u && d, Common::PI * 1.25f);
// Move down
MoveToDirection(d && !l && !r, Common::PI * 1.5f);
// Move to the bottom right
MoveToDirection(r && !u && d, Common::PI * 1.75f);
// Move if a key is pressed
if (r || l || u || d) {
amplitude = coef;
} else {
amplitude = 0;
}
// Delay the update rate to 100hz
std::this_thread::sleep_for(std::chrono::milliseconds(10));
}
}
std::tuple<float, float> GetStatus() const override {
if (Settings::values.emulate_analog_keyboard) {
return std::make_tuple(std::cos(angle) * amplitude, std::sin(angle) * amplitude);
}
constexpr float SQRT_HALF = 0.707106781f;
int x = 0, y = 0;
if (right->GetStatus()) {
++x;
}
if (left->GetStatus()) {
--x;
}
if (up->GetStatus()) {
++y;
}
if (down->GetStatus()) {
--y;
}
const float coef = modifier->GetStatus() ? modifier_scale : 1.0f;
return std::make_tuple(static_cast<float>(x) * coef * (y == 0 ? 1.0f : SQRT_HALF),
static_cast<float>(y) * coef * (x == 0 ? 1.0f : SQRT_HALF));
}
bool GetAnalogDirectionStatus(Input::AnalogDirection direction) const override {
switch (direction) {
case Input::AnalogDirection::RIGHT:
return right->GetStatus();
case Input::AnalogDirection::LEFT:
return left->GetStatus();
case Input::AnalogDirection::UP:
return up->GetStatus();
case Input::AnalogDirection::DOWN:
return down->GetStatus();
}
return false;
}
private:
Button up;
Button down;
Button left;
Button right;
Button modifier;
float modifier_scale;
float modifier_angle;
float angle{};
float amplitude{};
std::thread update_thread;
std::atomic<bool> update_thread_running{};
};
std::unique_ptr<Input::AnalogDevice> AnalogFromButton::Create(const Common::ParamPackage& params) {
const std::string null_engine = Common::ParamPackage{{"engine", "null"}}.Serialize();
auto up = Input::CreateDevice<Input::ButtonDevice>(params.Get("up", null_engine));
auto down = Input::CreateDevice<Input::ButtonDevice>(params.Get("down", null_engine));
auto left = Input::CreateDevice<Input::ButtonDevice>(params.Get("left", null_engine));
auto right = Input::CreateDevice<Input::ButtonDevice>(params.Get("right", null_engine));
auto modifier = Input::CreateDevice<Input::ButtonDevice>(params.Get("modifier", null_engine));
auto modifier_scale = params.Get("modifier_scale", 0.5f);
auto modifier_angle = params.Get("modifier_angle", 0.035f);
return std::make_unique<Analog>(std::move(up), std::move(down), std::move(left),
std::move(right), std::move(modifier), modifier_scale,
modifier_angle);
}
} // namespace InputCommon
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