feat: improve fps controller / add fog and ambient light to the scene

lightkeeper/include/components/FirstPersonController.h

@@ -8,6 +8,8 @@
 class Rigidbody;
 class CapsuleCollider;
 
+// Dynamic capsule character. Velocity is driven directly (no forces) so movement stays responsive:
+// acceleration towards the wished velocity, own gravity, coyote time and jump buffering.
 class FirstPersonController final : public Component {
 public:
     explicit FirstPersonController(GameObject& parent);
@@ -22,27 +24,53 @@ public:
     void Deserialize(const nlohmann::json& data) override;
 
     [[nodiscard]] float GetYaw() const { return m_Yaw; }
+    void SetYaw(float yawRadians) { m_Yaw = yawRadians; }
     [[nodiscard]] float GetPitch() const { return m_Pitch; }
     [[nodiscard]] float GetEyeHeight() const { return m_EyeHeight; }
 
-    void SetMovementSpeed(float speed) { m_MovementSpeed = speed; }
-    [[nodiscard]] float GetMovementSpeed() const { return m_MovementSpeed; }
+    // Eye position interpolated between the last two physics steps, so the camera moves smoothly at any framerate
+    [[nodiscard]] glm::vec3 GetEyePosition() const;
+
+    void SetMovementSpeed(float speed) { m_WalkSpeed = speed; }
+    [[nodiscard]] float GetMovementSpeed() const { return m_WalkSpeed; }
 
     void SetMouseSensitivity(float sens) { m_MouseSensitivity = sens; }
     [[nodiscard]] float GetMouseSensitivity() const { return m_MouseSensitivity; }
 
+    [[nodiscard]] bool IsGrounded() const { return m_Grounded; }
+
     [[nodiscard]] bool IsMouseCaptured() const { return InputManager::GetInstance().IsMouseCaptured(); }
     void SetMouseCaptured(bool captured);
 
 private:
+    [[nodiscard]] bool CheckGrounded() const;
+    [[nodiscard]] glm::vec3 GetWishDirection() const;
+
     Rigidbody* m_Rigidbody{nullptr};
     CapsuleCollider* m_Capsule{nullptr};
 
     float m_Yaw{0.0f};
     float m_Pitch{0.0f};
-    float m_MovementSpeed{5.0f};
     float m_MouseSensitivity{0.002f};
-    float m_EyeHeight{1.6f};
+    float m_EyeHeight{0.7f}; // above the capsule center
+
+    float m_WalkSpeed{5.0f};
+    float m_SprintSpeed{8.5f};
+    float m_GroundAcceleration{60.0f};
+    float m_AirAcceleration{15.0f};
+    float m_JumpHeight{1.3f};
+    float m_Gravity{22.0f};
+    float m_FallGravityMultiplier{1.6f};
+    float m_CoyoteTime{0.1f};
+    float m_JumpBufferTime{0.12f};
+
+    bool m_Grounded{false};
+    bool m_JumpHeld{false};
+    float m_CoyoteTimer{0.0f};
+    float m_JumpBufferTimer{0.0f};
+
+    glm::vec3 m_PreviousPosition{0.0f};
+    bool m_HasPreviousPosition{false};
 };
 
-#endif
+#endif