1 files changed, 131 insertions, 0 deletions
diff --git a/src/core/camera.h b/src/core/camera.h
new file mode 100644
index 0000000..c997c35
--- /dev/null
+++ b/src/core/camera.h
@@ -0,0 +1,131 @@
+#pragma once
+
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+
+#include <numbers>
+
+namespace Donut
+{
+    enum class CameraMode
+    {
+        FPS,
+        Orbital
+    };
+
+    class Camera
+    {
+    public:
+        Camera(float fov = 45.0f, float aspect_ratio = 16.0f / 9.0f,
+               float near_plane = 0.1f, float far_plane = 100.0f);
+        ~Camera() = default;
+
+        auto set_position(const glm::vec3& position) -> void { m_position = position; recalculate_view_matrix(); }
+        auto set_rotation(const glm::vec3& rotation) -> void { m_rotation = rotation; recalculate_view_matrix(); }
+
+        auto get_position() const -> const glm::vec3& { return m_position; }
+        auto get_rotation() const -> const glm::vec3& { return m_rotation; }
+
+        auto get_forward_direction() const -> glm::vec3;
+        auto get_right_direction()   const -> glm::vec3;
+        auto get_up_direction()      const -> glm::vec3;
+
+        auto get_projection_matrix()      const -> const glm::mat4& { return m_projection_matrix; }
+        auto get_view_matrix()            const -> const glm::mat4& { return m_view_matrix; }
+        auto get_view_projection_matrix() const -> const glm::mat4& { return m_view_projection_matrix; }
+
+        auto set_projection(float fov, float aspect_ratio, float near_plane, float far_plane) -> void;
+        auto on_mouse_move(float x_offset, float y_offset, bool constrain_pitch = true) -> void;
+
+        auto move_forward(float delta_time) -> void;
+        auto move_backward(float delta_time) -> void;
+        auto move_right(float delta_time) -> void;
+        auto move_left(float delta_time) -> void;
+        auto move_up(float delta_time) -> void;
+        auto move_down(float delta_time) -> void;
+
+        auto set_mouse_sensitivity(float sensitivity) -> void { m_mouse_sensitivity = sensitivity; }
+        auto get_mouse_sensitivity() const -> float { return m_mouse_sensitivity; }
+
+        auto set_movement_speed(float speed) -> void { m_movement_speed = speed; }
+        auto get_movement_speed() const -> float { return m_movement_speed; }
+
+        auto set_orbital_target(const glm::vec3& target) -> void { m_orbital_target = target; }
+        auto get_orbital_target() const -> const glm::vec3& { return m_orbital_target; }
+
+        auto set_orbital_radius(double radius) -> void { m_orbital_radius = radius; }
+        auto get_orbital_radius() const -> double { return m_orbital_radius; }
+
+        auto set_orbital_limits(double min_radius, double max_radius) -> void
+        {
+            m_orbital_min_radius = min_radius;
+            m_orbital_max_radius = max_radius;
+        }
+
+        auto set_orbital_speed(float speed) -> void { m_orbital_speed = speed; }
+        auto get_orbital_speed() const -> float { return m_orbital_speed; }
+
+        auto set_zoom_speed(double speed) -> void { m_zoom_speed = speed; }
+        auto get_zoom_speed() const -> double { return m_zoom_speed; }
+
+        auto set_azimuth(float azimuth) -> void { m_azimuth = azimuth; }
+        auto get_azimuth() const -> float { return m_azimuth; }
+
+        auto set_elevation(float elevation) -> void { m_elevation = elevation; }
+        auto get_elevation() const -> float { return m_elevation; }
+
+        auto get_orbital_position() const -> glm::vec3;
+        auto update_orbital() -> void;
+        auto process_orbital_mouse_move(double x, double y) -> void;
+        auto process_orbital_mouse_button(int button, int action, int mods) -> void;
+        auto process_orbital_scroll(double x_offset, double y_offset) -> void;
+
+        auto set_camera_mode(CameraMode mode) -> void { m_camera_mode = mode; }
+        auto get_camera_mode() const -> CameraMode { return m_camera_mode; }
+
+        auto is_dragging() const -> bool { return m_dragging; }
+        auto is_panning()  const -> bool { return m_panning; }
+        auto is_moving()   const -> bool { return m_moving; }
+        auto get_last_x()  const -> double { return m_last_x; }
+        auto get_last_y()  const -> double { return m_last_y; }
+
+    private:
+        auto recalculate_view_matrix() -> void;
+        auto recalculate_projection_matrix() -> void;
+
+    private:
+        CameraMode m_camera_mode = CameraMode::FPS;
+
+        glm::mat4 m_projection_matrix;
+        glm::mat4 m_view_matrix;
+        glm::mat4 m_view_projection_matrix;
+
+        glm::vec3 m_position = { 0.0f, 0.0f, 3.0f };
+        glm::vec3 m_rotation = { 0.0f, 0.0f, 0.0f };
+
+        float m_fov          = 45.0f;
+        float m_aspect_ratio = 16.0f / 9.0f;
+        float m_near_plane   = 0.1f;
+        float m_far_plane    = 100.0f;
+
+        float m_mouse_sensitivity = 0.1f;
+        float m_movement_speed    = 5.0f;
+        bool  m_first_mouse       = true;
+        float m_last_x            = 0.0f;
+        float m_last_y            = 0.0f;
+
+        glm::vec3 m_orbital_target     = glm::vec3(0.0f, 0.0f, 0.0f);
+        double    m_orbital_radius     = 6.34194e10;
+        double    m_orbital_min_radius = 1e10;
+        double    m_orbital_max_radius = 1e12;
+        float     m_azimuth            = 0.0f;
+        float     m_elevation          = static_cast<float>(std::numbers::pi) / 2.0f;
+        float     m_orbital_speed      = 0.01f;
+        double    m_zoom_speed         = 25e9f;
+        bool      m_dragging           = false;
+        bool      m_panning            = false;
+        bool      m_moving             = false;
+        double    m_last_x_orbital     = 0.0;
+        double    m_last_y_orbital     = 0.0;
+    };
+}