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-rw-r--r--src/input_common/helpers/stick_from_buttons.cpp304
1 files changed, 304 insertions, 0 deletions
diff --git a/src/input_common/helpers/stick_from_buttons.cpp b/src/input_common/helpers/stick_from_buttons.cpp
new file mode 100644
index 000000000..77fcd655e
--- /dev/null
+++ b/src/input_common/helpers/stick_from_buttons.cpp
@@ -0,0 +1,304 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <chrono>
+#include <cmath>
+#include "common/math_util.h"
+#include "common/settings.h"
+#include "input_common/helpers/stick_from_buttons.h"
+
+namespace InputCommon {
+
+class Stick final : public Common::Input::InputDevice {
+public:
+ using Button = std::unique_ptr<Common::Input::InputDevice>;
+
+ Stick(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_) {
+ Common::Input::InputCallback button_up_callback{
+ [this](Common::Input::CallbackStatus callback_) { UpdateUpButtonStatus(callback_); }};
+ Common::Input::InputCallback button_down_callback{
+ [this](Common::Input::CallbackStatus callback_) { UpdateDownButtonStatus(callback_); }};
+ Common::Input::InputCallback button_left_callback{
+ [this](Common::Input::CallbackStatus callback_) { UpdateLeftButtonStatus(callback_); }};
+ Common::Input::InputCallback button_right_callback{
+ [this](Common::Input::CallbackStatus callback_) {
+ UpdateRightButtonStatus(callback_);
+ }};
+ Common::Input::InputCallback button_modifier_callback{
+ [this](Common::Input::CallbackStatus callback_) { UpdateModButtonStatus(callback_); }};
+ up->SetCallback(button_up_callback);
+ down->SetCallback(button_down_callback);
+ left->SetCallback(button_left_callback);
+ right->SetCallback(button_right_callback);
+ modifier->SetCallback(button_modifier_callback);
+ last_x_axis_value = 0.0f;
+ last_y_axis_value = 0.0f;
+ }
+
+ 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 UpdateUpButtonStatus(Common::Input::CallbackStatus button_callback) {
+ up_status = button_callback.button_status.value;
+ UpdateStatus();
+ }
+
+ void UpdateDownButtonStatus(Common::Input::CallbackStatus button_callback) {
+ down_status = button_callback.button_status.value;
+ UpdateStatus();
+ }
+
+ void UpdateLeftButtonStatus(Common::Input::CallbackStatus button_callback) {
+ left_status = button_callback.button_status.value;
+ UpdateStatus();
+ }
+
+ void UpdateRightButtonStatus(Common::Input::CallbackStatus button_callback) {
+ right_status = button_callback.button_status.value;
+ UpdateStatus();
+ }
+
+ void UpdateModButtonStatus(Common::Input::CallbackStatus button_callback) {
+ modifier_status = button_callback.button_status.value;
+ UpdateStatus();
+ }
+
+ void UpdateStatus() {
+ const float coef = modifier_status ? modifier_scale : 1.0f;
+
+ bool r = right_status;
+ bool l = left_status;
+ bool u = up_status;
+ bool d = down_status;
+
+ // 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;
+ Common::Input::CallbackStatus status{
+ .type = Common::Input::InputType::Stick,
+ .stick_status = GetStatus(),
+ };
+ last_x_axis_value = status.stick_status.x.raw_value;
+ last_y_axis_value = status.stick_status.y.raw_value;
+ TriggerOnChange(status);
+ }
+
+ void ForceUpdate() override {
+ up->ForceUpdate();
+ down->ForceUpdate();
+ left->ForceUpdate();
+ right->ForceUpdate();
+ modifier->ForceUpdate();
+ }
+
+ void SoftUpdate() override {
+ Common::Input::CallbackStatus status{
+ .type = Common::Input::InputType::Stick,
+ .stick_status = GetStatus(),
+ };
+ if (last_x_axis_value == status.stick_status.x.raw_value &&
+ last_y_axis_value == status.stick_status.y.raw_value) {
+ return;
+ }
+ last_x_axis_value = status.stick_status.x.raw_value;
+ last_y_axis_value = status.stick_status.y.raw_value;
+ TriggerOnChange(status);
+ }
+
+ Common::Input::StickStatus GetStatus() const {
+ Common::Input::StickStatus status{};
+ status.x.properties = properties;
+ status.y.properties = properties;
+ if (Settings::values.emulate_analog_keyboard) {
+ const auto now = std::chrono::steady_clock::now();
+ float angle_ = GetAngle(now);
+ status.x.raw_value = std::cos(angle_) * amplitude;
+ status.y.raw_value = std::sin(angle_) * amplitude;
+ return status;
+ }
+ constexpr float SQRT_HALF = 0.707106781f;
+ int x = 0, y = 0;
+ if (right_status) {
+ ++x;
+ }
+ if (left_status) {
+ --x;
+ }
+ if (up_status) {
+ ++y;
+ }
+ if (down_status) {
+ --y;
+ }
+ const float coef = modifier_status ? modifier_scale : 1.0f;
+ status.x.raw_value = static_cast<float>(x) * coef * (y == 0 ? 1.0f : SQRT_HALF);
+ status.y.raw_value = static_cast<float>(y) * coef * (x == 0 ? 1.0f : SQRT_HALF);
+ return status;
+ }
+
+private:
+ Button up;
+ Button down;
+ Button left;
+ Button right;
+ Button modifier;
+ float modifier_scale;
+ float modifier_angle;
+ float angle{};
+ float goal_angle{};
+ float amplitude{};
+ bool up_status;
+ bool down_status;
+ bool left_status;
+ bool right_status;
+ bool modifier_status;
+ float last_x_axis_value;
+ float last_y_axis_value;
+ const Common::Input::AnalogProperties properties{0.0f, 1.0f, 0.5f, 0.0f, false};
+ std::chrono::time_point<std::chrono::steady_clock> last_update;
+};
+
+std::unique_ptr<Common::Input::InputDevice> StickFromButton::Create(
+ const Common::ParamPackage& params) {
+ const std::string null_engine = Common::ParamPackage{{"engine", "null"}}.Serialize();
+ auto up = Common::Input::CreateDeviceFromString<Common::Input::InputDevice>(
+ params.Get("up", null_engine));
+ auto down = Common::Input::CreateDeviceFromString<Common::Input::InputDevice>(
+ params.Get("down", null_engine));
+ auto left = Common::Input::CreateDeviceFromString<Common::Input::InputDevice>(
+ params.Get("left", null_engine));
+ auto right = Common::Input::CreateDeviceFromString<Common::Input::InputDevice>(
+ params.Get("right", null_engine));
+ auto modifier = Common::Input::CreateDeviceFromString<Common::Input::InputDevice>(
+ params.Get("modifier", null_engine));
+ auto modifier_scale = params.Get("modifier_scale", 0.5f);
+ auto modifier_angle = params.Get("modifier_angle", 5.5f);
+ return std::make_unique<Stick>(std::move(up), std::move(down), std::move(left),
+ std::move(right), std::move(modifier), modifier_scale,
+ modifier_angle);
+}
+
+} // namespace InputCommon