camera.h

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#ifndef CAMERA_H
#define CAMERA_H
 
#include <cglm/cglm.h>
#include <stdbool.h>
 
/* --- Camera Defaults --- */
 
#define DEFAULT_CAMERA_SPEED 15.0F        
#define DEFAULT_CAMERA_SENSITIVITY 0.15F  
#define DEFAULT_CAMERA_ZOOM 60.0F         
#define DEFAULT_ZOOM_SPEED 1.0F           
#define DEFAULT_SCROLL_SENSITIVITY 50.0F  
#define DEFAULT_MAX_PITCH 89.0F           
#define DEFAULT_MIN_PITCH -89.0F          
#define DEFAULT_MAX_ALPHA 1.0F            
#define DEFAULT_ACCELERATION 10.0F        
#define DEFAULT_FRICTION 0.85F            
#define DEFAULT_ROTATION_SMOOTHING 0.18F  
#define DEFAULT_BOBBING_FREQUENCY 2.2F    
#define DEFAULT_BOBBING_AMPLITUDE 0.0004F 
#define DEFAULT_MIN_VELOCITY_FOR_BOBBING \
    0.5F                              
#define DEFAULT_BOBBING_RESET_SPEED 0.95F 
#define DEFAULT_MIN_VELOCITY 0.01F        
#define DEFAULT_TARGET_FPS 60             
#define DEFAULT_FIXED_TIMESTEP \
    (1.0F / DEFAULT_TARGET_FPS)         
#define DEFAULT_MOUSE_SMOOTHING_FACTOR 0.1F 
typedef struct Camera {
    vec3 position; 
    vec3 front;    
    vec3 up;       
    vec3 right;    
    vec3 world_up; 
    float yaw;   
    float pitch; 
    float velocity;    
    float sensitivity; 
    float zoom;        
    /* Movement states (booleans — set by keyboard callbacks) */
    bool move_forward;
    bool move_backward;
    bool move_left;
    bool move_right;
    bool move_up;
    bool move_down;
 
    /* Unified movement input [-1,1] per camera-local axis.
     * [0] = right (+) / left (-),
     * [1] = up (+) / down (-),
     * [2] = forward (+) / backward (-).
     * Built each physics step from keyboard flags and/or gamepad. */
    vec3 move_input;
 
    /* Realistic physics */
    vec3 velocity_current; 
    float acceleration;    
    float friction;        
    /* Smooth rotation */
    float yaw_target;         
    float pitch_target;       
    float rotation_smoothing; 
    float smoothed_x;         
    float smoothed_y;         
    /* Head bobbing */
    float bobbing_time; 
    float bobbing_frequency; 
    float
        bobbing_amplitude; 
    bool bobbing_enabled;  
    /* Timing */
    float physics_accumulator; 
    float fixed_timestep; 
    float mouse_smoothing_factor; 
    /* Input State */
    double last_mouse_x; 
    double last_mouse_y; 
    bool first_mouse;    
} Camera;
 
void camera_init(Camera* cam, float distance, float yaw, float pitch);
 
void camera_update_vectors(Camera* cam);
 
void camera_process_mouse(Camera* cam, float xoffset, float yoffset);
 
void camera_get_view_matrix(Camera* cam, mat4 view);
 
void camera_process_scroll(Camera* cam, float yoffset);
 
void camera_fixed_update(Camera* cam);
 
void camera_build_keyboard_input(Camera* cam);
 
#endif /* CAMERA_H */