#pragma once

#include <glm/matrix.hpp>

struct Viewport {
    float fov_degrees;
    float width;
    float height;
};

Viewport make_viewport(float win_w, float win_h, float fov_degrees);
glm::mat4 camera_to_projection(Viewport& v);

struct Camera {
    glm::vec3 focus;
    float theta, phi, distance;
};

Camera make_camera(glm::vec3 focus, float distance);
void pan_camera(Camera &c, glm::vec2 dxdy);
void rotate_camera(Camera &c, glm::vec2 dxdy);
void zoom_camera(Camera &c, float dz);
glm::mat4 world_to_camera(Camera& c);
glm::mat4 camera_to_world(Camera& c);