orbit_camera.h

#pragma once
 
#include "pixelbullet/scene/view.h"
 
#include <glm/glm.hpp>
 
namespace pixelbullet
{
class OrbitCamera
{
public:
    struct Bounds
    {
        glm::vec3 min = glm::vec3(0.0f);
        glm::vec3 max = glm::vec3(0.0f);
        bool valid = false;
 
        void Include(const glm::vec3& point);
        [[nodiscard]] glm::vec3 GetCenter() const;
        [[nodiscard]] glm::vec3 GetExtents() const;
    };
 
    OrbitCamera();
 
    void Reset();
    void SetLookAt(const glm::vec3& position, const glm::vec3& pivot, float field_of_view_degrees, float near_plane, float far_plane);
    void Orbit(const glm::vec2& delta);
    void Pan(const glm::vec2& delta, const glm::vec2& viewport_size);
    void Dolly(float delta);
    void Frame(const Bounds& bounds);
    void FramePoint(const glm::vec3& point, float radius = 0.5f);
 
    [[nodiscard]] ExtractedView BuildView(glm::uvec2 target_extent) const;
    [[nodiscard]] glm::vec3 GetPosition() const;
    [[nodiscard]] glm::vec3 GetForward() const;
    [[nodiscard]] glm::vec3 GetRight() const;
    [[nodiscard]] glm::vec3 GetUp() const;
 
    [[nodiscard]] const glm::vec3& GetPivot() const noexcept
    {
        return pivot_;
    }
    [[nodiscard]] float GetDistance() const noexcept
    {
        return distance_;
    }
    [[nodiscard]] float GetYawDegrees() const noexcept
    {
        return yaw_degrees_;
    }
    [[nodiscard]] float GetPitchDegrees() const noexcept
    {
        return pitch_degrees_;
    }
    [[nodiscard]] float GetFieldOfViewDegrees() const noexcept
    {
        return field_of_view_degrees_;
    }
    [[nodiscard]] float GetNearPlane() const noexcept
    {
        return near_plane_;
    }
    [[nodiscard]] float GetFarPlane() const noexcept
    {
        return far_plane_;
    }
 
private:
    glm::vec3 pivot_ = glm::vec3(0.0f);
    float distance_ = 6.0f;
    float yaw_degrees_ = 35.0f;
    float pitch_degrees_ = -25.0f;
    float field_of_view_degrees_ = 45.0f;
    float near_plane_ = 0.1f;
    float far_plane_ = 1000.0f;
};
} // namespace pixelbullet