[hid_core, input_common] use std::numbers::pi{_v} instead of re-defining (#4160)

don't reinvent the wheel, simple as that.

Signed-off-by: lizzie <lizzie@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4160
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>

src/common/math_util.h

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: 2013 Dolphin Emulator Project
@@ -13,8 +13,6 @@
 
 namespace Common {
 
-constexpr float PI = 3.1415926535f;
-
 template <class T>
 struct Rectangle {
     T left{};

src/hid_core/frontend/motion_input.cpp

@@ -1,7 +1,11 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include <cmath>
+#include <numbers>
 
 #include "common/math_util.h"
 #include "hid_core/frontend/motion_input.h"
@@ -145,7 +149,7 @@ void MotionInput::UpdateOrientation(u64 elapsed_time) {
     }
 
     const auto normal_accel = accel.Normalized();
-    auto rad_gyro = gyro * Common::PI * 2;
+    auto rad_gyro = gyro * std::numbers::pi_v<float> * 2.f;
     const f32 swap = rad_gyro.x;
     rad_gyro.x = rad_gyro.y;
     rad_gyro.y = -swap;
@@ -272,7 +276,7 @@ Common::Vec3f MotionInput::GetEulerAngles() const {
 
     return {
         std::atan2(sinr_cosp, cosr_cosp),
-        2 * std::atan2(sinp, cosp) - Common::PI / 2,
+        2 * std::atan2(sinp, cosp) - float(std::numbers::pi_v<float>) / 2,
         std::atan2(siny_cosp, cosy_cosp),
     };
 }

src/hid_core/resources/touch_screen/gesture_handler.cpp

@@ -1,9 +1,10 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
+#include <numbers>
 #include "common/math_util.h"
 #include "hid_core/resources/touch_screen/gesture_handler.h"
 
@@ -214,7 +215,7 @@ void GestureHandler::UpdatePanEvent(GestureState& next_state, GestureType& type)
     if (std::abs(angle_between_two_lines) > AngleThreshold) {
         type = GestureType::Rotate;
         next_state.scale = 0;
-        next_state.rotation_angle = angle_between_two_lines * 180.0f / Common::PI;
+        next_state.rotation_angle = angle_between_two_lines * 180.0f / float(std::numbers::pi_v<float>);
     }
 }
 

src/input_common/drivers/sdl_driver.cpp

@@ -3,6 +3,8 @@
 // SPDX-FileCopyrightText: 2018 Citra Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#include <array>
+#include <numbers>
 #include "common/logging.h"
 #include "common/math_util.h"
 #include "common/param_package.h"
@@ -146,9 +148,9 @@ public:
             break;
         }
         case SDL_SENSOR_GYRO: {
-            motion.gyro_x = event.data[0] / (Common::PI * 2);
-            motion.gyro_y = -event.data[2] / (Common::PI * 2);
-            motion.gyro_z = event.data[1] / (Common::PI * 2);
+            motion.gyro_x = event.data[0] / (f32(std::numbers::pi_v<float>) * 2);
+            motion.gyro_y = -event.data[2] / (f32(std::numbers::pi_v<float>) * 2);
+            motion.gyro_z = event.data[1] / (f32(std::numbers::pi_v<float>) * 2);
             break;
         }
         }

src/input_common/helpers/stick_from_buttons.cpp

@@ -1,8 +1,12 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: 2017 Citra Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include <chrono>
 #include <cmath>
+#include <numbers>
 #include "common/math_util.h"
 #include "common/settings.h"
 #include "input_common/helpers/stick_from_buttons.h"
@@ -15,9 +19,8 @@ public:
     // do not play nicely with the theoretical maximum range.
     // Using a value one lower from the maximum emulates real stick behavior.
     static constexpr float MAX_RANGE = 32766.0f / 32767.0f;
-    static constexpr float TAU = Common::PI * 2.0f;
     // Use wider angle to ease the transition.
-    static constexpr float APERTURE = TAU * 0.15f;
+    static constexpr float APERTURE = float((std::numbers::pi_v<float> / 2.f)) * 0.15f;
 
     using Button = std::unique_ptr<Common::Input::InputDevice>;
 
@@ -66,13 +69,13 @@ public:
     bool IsAngleGreater(float old_angle, float new_angle) const {
         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);
+               (old_angle + f32((std::numbers::pi_v<float> / 2.f)) > new_angle && old_angle + f32((std::numbers::pi_v<float> / 2.f)) <= top_limit);
     }
 
     bool IsAngleSmaller(float old_angle, float new_angle) const {
         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);
+               (old_angle - f32((std::numbers::pi_v<float> / 2.f)) >= bottom_limit && old_angle - f32((std::numbers::pi_v<float> / 2.f)) < new_angle);
     }
 
     float GetAngle(std::chrono::time_point<std::chrono::steady_clock> now) const {
@@ -87,16 +90,16 @@ public:
 
         if (IsAngleGreater(new_angle, goal_angle)) {
             new_angle -= modifier_angle * time_difference;
-            if (new_angle < 0) {
-                new_angle += TAU;
+            if (new_angle < 0.f) {
+                new_angle += f32((std::numbers::pi_v<float> / 2.f));
             }
             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 (new_angle >= f32((std::numbers::pi_v<float> / 2.f))) {
+                new_angle -= f32((std::numbers::pi_v<float> / 2.f));
             }
             if (!IsAngleSmaller(new_angle, goal_angle)) {
                 return goal_angle;
@@ -108,45 +111,14 @@ public:
     }
 
     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;
-        }
+        if (r && !u && !d) goal_angle = f32(std::numbers::pi_v<float>) * 0.00f; //right
+        if (r && u && !d)  goal_angle = f32(std::numbers::pi_v<float>) * 0.25f; //upper right
+        if (u && !l && !r) goal_angle = f32(std::numbers::pi_v<float>) * 0.50f; //up
+        if (l && u && !d)  goal_angle = f32(std::numbers::pi_v<float>) * 0.75f; //upper left
+        if (l && !u && !d) goal_angle = f32(std::numbers::pi_v<float>) * 1.00f; //left
+        if (l && !u && d)  goal_angle = f32(std::numbers::pi_v<float>) * 1.25f; //bottom left
+        if (d && !l && !r) goal_angle = f32(std::numbers::pi_v<float>) * 1.50f; //down
+        if (r && !u && d)  goal_angle = f32(std::numbers::pi_v<float>) * 1.75f; //bottom right
     }
 
     void UpdateUpButtonStatus(const Common::Input::CallbackStatus& button_callback) {

src/yuzu/configuration/configure_input_player_widget.cpp

@@ -1612,7 +1612,7 @@ void PlayerControlPreview::DrawGCBody(QPainter& p, const QPointF center) {
     std::array<QPointF, gc_body.size()> qbody;
     std::array<QPointF, 8> left_hex;
     std::array<QPointF, 8> right_hex;
-    constexpr float angle = 2 * 3.1415f / 8;
+    constexpr float angle = 2.f * float(M_PI) / 8.f;
 
     for (std::size_t point = 0; point < gc_left_body.size() / 2; ++point) {
         const float body_x = gc_left_body[point * 2 + 0];