yuzu/src/input_common/analog_from_button.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 <atomic>
#include <chrono>
#include <cmath>
#include <thread>
#include "common/math_util.h"
#include "common/settings.h"
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#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_)
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: 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_) {
Input::InputCallback<bool> callbacks{
[this]([[maybe_unused]] bool status) { UpdateStatus(); }};
up->SetCallback(callbacks);
down->SetCallback(callbacks);
left->SetCallback(callbacks);
right->SetCallback(callbacks);
}
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bool IsAngleGreater(float old_angle, float new_angle) const {
constexpr float TAU = Common::PI * 2.0f;
// Use wider angle to ease the transition.
constexpr float aperture = TAU * 0.15f;
const float top_limit = new_angle + aperture;
return (old_angle > new_angle && old_angle <= top_limit) ||
(old_angle + TAU > new_angle && old_angle + TAU <= top_limit);
}
bool IsAngleSmaller(float old_angle, float new_angle) const {
constexpr float TAU = Common::PI * 2.0f;
// Use wider angle to ease the transition.
constexpr float aperture = TAU * 0.15f;
const float bottom_limit = new_angle - aperture;
return (old_angle >= bottom_limit && old_angle < new_angle) ||
(old_angle - TAU >= bottom_limit && old_angle - TAU < new_angle);
}
float GetAngle(std::chrono::time_point<std::chrono::steady_clock> now) const {
constexpr float TAU = Common::PI * 2.0f;
float new_angle = angle;
auto time_difference = static_cast<float>(
std::chrono::duration_cast<std::chrono::microseconds>(now - last_update).count());
time_difference /= 1000.0f * 1000.0f;
if (time_difference > 0.5f) {
time_difference = 0.5f;
}
if (IsAngleGreater(new_angle, goal_angle)) {
new_angle -= modifier_angle * time_difference;
if (new_angle < 0) {
new_angle += TAU;
}
if (!IsAngleGreater(new_angle, goal_angle)) {
return goal_angle;
}
} else if (IsAngleSmaller(new_angle, goal_angle)) {
new_angle += modifier_angle * time_difference;
if (new_angle >= TAU) {
new_angle -= TAU;
}
if (!IsAngleSmaller(new_angle, goal_angle)) {
return goal_angle;
}
} else {
return goal_angle;
}
return new_angle;
}
void SetGoalAngle(bool r, bool l, bool u, bool d) {
// Move to the right
if (r && !u && !d) {
goal_angle = 0.0f;
}
// Move to the upper right
if (r && u && !d) {
goal_angle = Common::PI * 0.25f;
}
// Move up
if (u && !l && !r) {
goal_angle = Common::PI * 0.5f;
}
// Move to the upper left
if (l && u && !d) {
goal_angle = Common::PI * 0.75f;
}
// Move to the left
if (l && !u && !d) {
goal_angle = Common::PI;
}
// Move to the bottom left
if (l && !u && d) {
goal_angle = Common::PI * 1.25f;
}
// Move down
if (d && !l && !r) {
goal_angle = Common::PI * 1.5f;
}
// Move to the bottom right
if (r && !u && d) {
goal_angle = Common::PI * 1.75f;
}
}
void UpdateStatus() {
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 if a key is pressed
if (r || l || u || d) {
amplitude = coef;
} else {
amplitude = 0;
}
const auto now = std::chrono::steady_clock::now();
const auto time_difference = static_cast<u64>(
std::chrono::duration_cast<std::chrono::milliseconds>(now - last_update).count());
if (time_difference < 10) {
// Disable analog mode if inputs are too fast
SetGoalAngle(r, l, u, d);
angle = goal_angle;
} else {
angle = GetAngle(now);
SetGoalAngle(r, l, u, d);
}
last_update = now;
}
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std::tuple<float, float> GetStatus() const override {
if (Settings::values.emulate_analog_keyboard) {
const auto now = std::chrono::steady_clock::now();
float angle_ = GetAngle(now);
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));
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}
Input::AnalogProperties GetAnalogProperties() const override {
return {modifier_scale, 1.0f, 0.5f};
}
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;
}
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private:
Button up;
Button down;
Button left;
Button right;
Button modifier;
float modifier_scale;
float modifier_angle;
float angle{};
float goal_angle{};
float amplitude{};
std::chrono::time_point<std::chrono::steady_clock> last_update;
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};
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", 5.5f);
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return std::make_unique<Analog>(std::move(up), std::move(down), std::move(left),
std::move(right), std::move(modifier), modifier_scale,
modifier_angle);
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}
} // namespace InputCommon