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#include "scene.h"
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <algorithm>
#include <cmath>
#include <numbers>
namespace Donut
{
Scene::Scene()
{
// Black-hole camera: large-scale orbital viewer outside the disk.
sim_camera.set_camera_mode(CameraMode::Orbital);
sim_camera.set_orbital_target(glm::vec3(0.0f));
sim_camera.set_orbital_radius(4e11); // ~31 r_s: outside the 12 r_s disk
sim_camera.set_orbital_limits(2.2e11, 1.5e12);
sim_camera.set_orbital_speed(0.01f);
sim_camera.set_zoom_speed(3e10);
sim_camera.set_azimuth(0.0f);
sim_camera.set_elevation(1.25f);
// Scene camera: normal-scale orbital world-builder viewer.
scene_camera.set_camera_mode(CameraMode::Orbital);
scene_camera.set_orbital_target(glm::vec3(0.0f));
scene_camera.set_orbital_radius(15.0);
scene_camera.set_orbital_limits(2.0, 200.0);
scene_camera.set_orbital_speed(0.01f);
scene_camera.set_zoom_speed(2.0);
scene_camera.set_azimuth(0.0f);
scene_camera.set_elevation((float)std::numbers::pi / 3.0f);
scene_camera.update_orbital();
}
auto Scene::reset_sim_camera() -> void
{
sim_camera.set_camera_mode(CameraMode::Orbital);
sim_camera.set_orbital_radius(4e11);
sim_camera.set_azimuth(0.0f);
sim_camera.set_elevation(1.25f);
}
auto Scene::set_free_fly(bool enabled) -> void
{
const bool is_fps = sim_camera.get_camera_mode() == CameraMode::FPS;
if (enabled == is_fps) return;
if (enabled)
{
// Seed the fly pose from the current orbital framing so the view is continuous.
glm::vec3 pos = sim_camera.get_orbital_position();
glm::vec3 fwd = glm::normalize(sim_camera.get_orbital_target() - pos);
float pitch = glm::degrees(asin(glm::clamp(fwd.y, -1.0f, 1.0f)));
float yaw = glm::degrees(atan2(fwd.z, fwd.x));
sim_camera.set_camera_mode(CameraMode::FPS);
sim_camera.set_movement_speed(2.0e10f);
sim_camera.set_mouse_sensitivity(0.15f);
sim_camera.set_position(pos);
sim_camera.set_rotation(glm::vec3(pitch, yaw, 0.0f));
}
else
{
sim_camera.set_camera_mode(CameraMode::Orbital); // orbital state was left intact
}
}
}
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