/* 
 * camera.h
 *
 * CAM-AM-AM-AM-AMER!!! a.
 *
 */

#include "SDL.h"
#import "config.h"
#import "vector.h"

// Camera state.
typedef struct {
    vector eye, focus, up;
} camera;

// Initialize the camera.
camera *new_camera(graphics_settings settings);


// Turns the camera to look at something.  The eye vector remains constant.
void look_at_by_rotating(camera *c, vector what);

// Moves the camera to look at something.  This changes the eye vector so that the look direction stays constant.
void look_at_by_translating(camera *c, vector what);

// Moves the focal point of the camera around.
void move_focus(camera *c, vector delta);

// Moves the eye position of the camera around.
void move_eye(camera *c, vector delta);

// Moves the eye position and focal point of the camera around.
void move_camera(camera *c, vector delta);

// Multiplies the current matrix by the camera's matrix.
void apply_camera(camera *c);