core/hid: Fix rumble too strong at 1%

src/common/input.h

@@ -60,6 +60,12 @@ enum class PollingError {
     Unknown,
 };
 
+// Hint for amplification curve to be used
+enum class VibrationAmplificationType {
+    Linear,
+    Exponential,
+};
+
 struct AnalogProperties {
     float deadzone{};
     float range{1.0f};
@@ -126,6 +132,7 @@ struct VibrationStatus {
     f32 low_frequency{};
     f32 high_amplitude{};
     f32 high_frequency{};
+    VibrationAmplificationType type;
 };
 
 struct LedStatus {

src/core/hid/emulated_controller.cpp

@@ -54,7 +54,6 @@ Settings::ControllerType EmulatedController::MapNPadToSettingsType(NpadType type
 }
 
 void EmulatedController::ReloadFromSettings() {
-    //LOG_ERROR(Service_HID, "reload config from settings {}", NpadIdTypeToIndex(npad_id_type));
     const auto player_index = NpadIdTypeToIndex(npad_id_type);
     const auto& player = Settings::values.players.GetValue()[player_index];
 
@@ -640,12 +639,22 @@ bool EmulatedController::SetVibration(std::size_t device_index, VibrationValue v
     if (!output_devices[device_index]) {
         return false;
     }
+    const auto player_index = NpadIdTypeToIndex(npad_id_type);
+    const auto& player = Settings::values.players.GetValue()[player_index];
+    const f32 strength = static_cast<f32>(player.vibration_strength) / 100.0f;
+
+    // Exponential amplification is too strong at low amplitudes. Switch to a linear
+    // amplification if strength is set below 0.7f
+    const Input::VibrationAmplificationType type =
+        strength > 0.7f ? Input::VibrationAmplificationType::Exponential
+                        : Input::VibrationAmplificationType::Linear;
 
     const Input::VibrationStatus status = {
-        .low_amplitude = vibration.high_amplitude,
+        .low_amplitude = std::min(vibration.low_amplitude * strength, 1.0f),
-        .low_frequency = vibration.high_amplitude,
+        .low_frequency = vibration.low_frequency,
-        .high_amplitude = vibration.high_amplitude,
+        .high_amplitude = std::min(vibration.high_amplitude * strength, 1.0f),
-        .high_frequency = vibration.high_amplitude,
+        .high_frequency = vibration.high_frequency,
+        .type = type,
     };
     return output_devices[device_index]->SetVibration(status) == Input::VibrationError::None;
 }
@@ -661,6 +670,7 @@ bool EmulatedController::TestVibration(std::size_t device_index) {
         .low_frequency = 160.0f,
         .high_amplitude = 0.001f,
         .high_frequency = 320.0f,
+        .type = Input::VibrationAmplificationType::Linear,
     };
     return output_devices[device_index]->SetVibration(status) == Input::VibrationError::None;
 }

src/input_common/drivers/sdl_driver.cpp

@@ -107,6 +107,14 @@ public:
 
         return false;
     }
+
+    bool HasHDRumble() const {
+        if (sdl_controller) {
+            return (SDL_GameControllerGetType(sdl_controller.get()) ==
+                    SDL_CONTROLLER_TYPE_NINTENDO_SWITCH_PRO);
+        }
+        return false;
+    }
     /**
      * The Pad identifier of the joystick
      */
@@ -515,16 +523,26 @@ Input::VibrationError SDLDriver::SetRumble(const PadIdentifier& identifier,
     const auto process_amplitude = [](f32 amplitude) {
         return (amplitude + std::pow(amplitude, 0.3f)) * 0.5f * 0xFFFF;
     };
-    const Input::VibrationStatus new_vibration{
+    const Input::VibrationStatus exponential_vibration{
         .low_amplitude = process_amplitude(vibration.low_amplitude),
         .low_frequency = vibration.low_frequency,
         .high_amplitude = process_amplitude(vibration.high_amplitude),
         .high_frequency = vibration.high_frequency,
+        .type = Input::VibrationAmplificationType::Exponential,
     };
 
+    Input::VibrationStatus new_vibration{};
+
+    if (vibration.type == Input::VibrationAmplificationType::Linear || joystick->HasHDRumble()) {
+        new_vibration = vibration;
+    } else {
+        new_vibration = exponential_vibration;
+    }
+
     if (!joystick->RumblePlay(new_vibration)) {
         return Input::VibrationError::Unknown;
     }
+
     return Input::VibrationError::None;
 }
 Common::ParamPackage SDLDriver::BuildAnalogParamPackageForButton(int port, std::string guid,