Scale mouse/joystick sensitivity depending on FOV (#11007)

1 files changed, 19 insertions, 4 deletions

diff --git a/src/client/game.cpp b/src/client/game.cpp
index 2575e5406..9cc359843 100644
--- a/src/client/game.cpp
+++ b/src/client/game.cpp
@@ -829,6 +829,8 @@ private:
 		const NodeMetadata *meta);
 	static const ClientEventHandler clientEventHandler[CLIENTEVENT_MAX];
 
+	f32 getSensitivityScaleFactor() const;
+
 	InputHandler *input = nullptr;
 
 	Client *client = nullptr;
@@ -2341,7 +2343,6 @@ void Game::checkZoomEnabled()
 		m_game_ui->showTranslatedStatusText("Zoom currently disabled by game or mod");
 }
 
-
 void Game::updateCameraDirection(CameraOrientation *cam, float dtime)
 {
 	if ((device->isWindowActive() && device->isWindowFocused()
@@ -2377,6 +2378,18 @@ void Game::updateCameraDirection(CameraOrientation *cam, float dtime)
 	}
 }
 
+// Get the factor to multiply with sensitivity to get the same mouse/joystick
+// responsiveness independently of FOV.
+f32 Game::getSensitivityScaleFactor() const
+{
+	f32 fov_y = client->getCamera()->getFovY();
+
+	// Multiply by a constant such that it becomes 1.0 at 72 degree FOV and
+	// 16:9 aspect ratio to minimize disruption of existing sensitivity
+	// settings.
+	return tan(fov_y / 2.0f) * 1.3763818698f;
+}
+
 void Game::updateCameraOrientation(CameraOrientation *cam, float dtime)
 {
 #ifdef HAVE_TOUCHSCREENGUI
@@ -2392,8 +2405,9 @@ void Game::updateCameraOrientation(CameraOrientation *cam, float dtime)
 			dist.Y = -dist.Y;
 		}
 
-		cam->camera_yaw   -= dist.X * m_cache_mouse_sensitivity;
-		cam->camera_pitch += dist.Y * m_cache_mouse_sensitivity;
+		f32 sens_scale = getSensitivityScaleFactor();
+		cam->camera_yaw   -= dist.X * m_cache_mouse_sensitivity * sens_scale;
+		cam->camera_pitch += dist.Y * m_cache_mouse_sensitivity * sens_scale;
 
 		if (dist.X != 0 || dist.Y != 0)
 			input->setMousePos(center.X, center.Y);
@@ -2402,7 +2416,8 @@ void Game::updateCameraOrientation(CameraOrientation *cam, float dtime)
 #endif
 
 	if (m_cache_enable_joysticks) {
-		f32 c = m_cache_joystick_frustum_sensitivity * (1.f / 32767.f) * dtime;
+		f32 sens_scale = getSensitivityScaleFactor();
+		f32 c = m_cache_joystick_frustum_sensitivity * (1.f / 32767.f) * dtime * sens_scale;
 		cam->camera_yaw -= input->joystick.getAxisWithoutDead(JA_FRUSTUM_HORIZONTAL) * c;
 		cam->camera_pitch += input->joystick.getAxisWithoutDead(JA_FRUSTUM_VERTICAL) * c;
 	}