input_common: Make button threshold customizable

src/input_common/sdl/sdl_impl.cpp

@@ -660,7 +660,8 @@ public:
 
         if (params.Has("axis")) {
             const int axis = params.Get("axis", 0);
-            const float threshold = params.Get("threshold", 0.5f);
+            // Convert range from (0.0, 1.0) to (-1.0, 1.0)
+            const float threshold = (params.Get("threshold", 0.5f) - 0.5f) * 2.0f;
             const std::string direction_name = params.Get("direction", "");
             bool trigger_if_greater;
             if (direction_name == "+") {
@@ -933,12 +934,11 @@ Common::ParamPackage BuildAnalogParamPackageForButton(int port, std::string guid
     params.Set("port", port);
     params.Set("guid", std::move(guid));
     params.Set("axis", axis);
+    params.Set("threshold", "0.5");
     if (value > 0) {
         params.Set("direction", "+");
-        params.Set("threshold", "0.5");
     } else {
         params.Set("direction", "-");
-        params.Set("threshold", "-0.5");
     }
     return params;
 }

src/yuzu/configuration/configure_input_player.cpp

@@ -313,6 +313,16 @@ ConfigureInputPlayer::ConfigureInputPlayer(QWidget* parent, std::size_t player_i
                         buttons_param[button_id].Set("toggle", toggle_value);
                         button_map[button_id]->setText(ButtonToText(buttons_param[button_id]));
                     });
+                    if (buttons_param[button_id].Has("threshold")) {
+                        context_menu.addAction(tr("Set threshold"), [&] {
+                            const int button_threshold = static_cast<int>(
+                                buttons_param[button_id].Get("threshold", 0.5f) * 100.0f);
+                            const int new_threshold = QInputDialog::getInt(
+                                this, tr("Set threshold"), tr("Choose a value between 0% and 100%"),
+                                button_threshold, 0, 100);
+                            buttons_param[button_id].Set("threshold", new_threshold / 100.0f);
+                        });
+                    }
                     context_menu.exec(button_map[button_id]->mapToGlobal(menu_location));
                     ui->controllerFrame->SetPlayerInput(player_index, buttons_param, analogs_param);
                 });