Add mouse input option for the third-person camera (#1011)

* Untie existing mouse logic from gyro

* A bit more mouse cleanup before I start building off it

* Rebase and last bit of cleanup

* Fix rebase mistake, don't apply invertFirstPerson to gyro or mouse input

* Remove the deprecated ImGui toast system

* Add Mouse Camera option in preparation for its use

* WIP, add mouse controls for the third-person camera

* Various helpText revisions

* Enable free camera on horseback

* Untie mouse camera and free camera options
Either being enabled now allows the underlying freecam logic to run

* Allow simultaneous C-stick and mouse input

* Combine mouse sensitivities for both aim and camera

* Add option for inverting mouse Y

* Refactor cursor visibility handling

* Tighten aim capture condition and constrain cursor to window region

* Tidying my trash

* Last bit of housekeeping so I'm satisfied

* Don't write code while sleep deprived

* Fix my sloppy merge and a few helpText updates

* Disable control stick aim when mouse aim is active

* Use same conditions for cursor grabbing as for capture

include/d/actor/d_a_alink.h

@@ -4551,7 +4551,7 @@ public:
 #if TARGET_PC
     void handleWolfHowl();
     void handleQuickTransform();
-    bool checkGyroAimContext();
+    bool checkAimContext();
 
     void onIronBallChainInterpCallback();
 

include/d/d_camera.h

@@ -1037,6 +1037,7 @@ public:
     bool test1Camera(s32);
     bool test2Camera(s32);
     #if TARGET_PC
+    static bool canUseFreeCam();
     bool freeCamera();
     bool executeDebugFlyCam();
     void deactivateDebugFlyCam();

include/dusk/gyro.h

@@ -1,5 +1,4 @@
-#ifndef DUSK_GYRO_H
-#define DUSK_GYRO_H
+#pragma once
 
 namespace dusk::gyro {
 void read(float dt);
@@ -14,5 +13,3 @@ bool get_sensor_keep_alive();
 void set_sensor_keep_alive(bool value);
 bool rollgoal_gyro_enabled();
 }  // namespace dusk::gyro
-
-#endif

include/dusk/mouse.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <SDL3/SDL_events.h>
+
+namespace dusk::mouse {
+void read();
+void getAimDeltas(float& out_yaw, float& out_pitch);
+void getCameraDeltas(float& out_yaw, float& out_pitch);
+void handle_event(const SDL_Event& event) noexcept;
+void onFocusLost();
+void onFocusGained();
+}  // namespace dusk::mouse

include/dusk/settings.h

@@ -187,7 +187,6 @@ struct UserSettings {
         ConfigVar<bool> midnasLamentNonStop;
 
         // Input
-        ConfigVar<GyroMode> gyroMode;
         ConfigVar<bool> enableGyroAim;
         ConfigVar<bool> enableGyroRollgoal;
         ConfigVar<float> gyroSensitivityX;
@@ -197,6 +196,11 @@ struct UserSettings {
         ConfigVar<float> gyroDeadband;
         ConfigVar<bool> gyroInvertPitch;
         ConfigVar<bool> gyroInvertYaw;
+        ConfigVar<bool> enableMouseCamera;
+        ConfigVar<bool> enableMouseAim;
+        ConfigVar<float> mouseAimSensitivity;
+        ConfigVar<float> mouseCameraSensitivity;
+        ConfigVar<bool> invertMouseY;
         ConfigVar<bool> freeCamera;
         ConfigVar<bool> invertCameraXAxis;
         ConfigVar<bool> invertCameraYAxis;