camera_component.h

#pragma once
 
#include "pixelbullet/serialization/node.h"
 
#include <string>
#include <string_view>
 
namespace pixelbullet
{
enum class CameraProjectionMode
{
    Perspective,
    Orthographic,
};
 
[[nodiscard]] constexpr std::string_view ToString(const CameraProjectionMode value) noexcept
{
    switch (value)
    {
    case CameraProjectionMode::Orthographic:
        return "Orthographic";
    case CameraProjectionMode::Perspective:
    default:
        return "Perspective";
    }
}
 
inline Node& operator<<(Node& node, const CameraProjectionMode& value)
{
    node << std::string(ToString(value));
    return node;
}
 
inline const Node& operator>>(const Node& node, CameraProjectionMode& value)
{
    std::string serialized;
    node >> serialized;
    value = serialized == "Orthographic" ? CameraProjectionMode::Orthographic : CameraProjectionMode::Perspective;
    return node;
}
 
struct CameraComponent
{
    bool primary = true;
    float field_of_view_degrees = 45.0f;
    float near_plane = 0.1f;
    float far_plane = 1000.0f;
    CameraProjectionMode projection_mode = CameraProjectionMode::Perspective;
    float orthographic_x_mag = 1.0f;
    float orthographic_y_mag = 1.0f;
};
 
inline Node& operator<<(Node& node, const CameraComponent& camera)
{
    node["primary"] << camera.primary;
    node["fieldOfViewDegrees"] << camera.field_of_view_degrees;
    node["nearPlane"] << camera.near_plane;
    node["farPlane"] << camera.far_plane;
    node["projectionMode"] << camera.projection_mode;
    node["orthographicXMag"] << camera.orthographic_x_mag;
    node["orthographicYMag"] << camera.orthographic_y_mag;
    return node;
}
 
inline const Node& operator>>(const Node& node, CameraComponent& camera)
{
    node["primary"] >> camera.primary;
    node["fieldOfViewDegrees"] >> camera.field_of_view_degrees;
    node["nearPlane"] >> camera.near_plane;
    node["farPlane"] >> camera.far_plane;
    if (node.has_property("projectionMode"))
    {
        node["projectionMode"] >> camera.projection_mode;
    }
    if (node.has_property("orthographicXMag"))
    {
        node["orthographicXMag"] >> camera.orthographic_x_mag;
    }
    if (node.has_property("orthographicYMag"))
    {
        node["orthographicYMag"] >> camera.orthographic_y_mag;
    }
    return node;
}
} // namespace pixelbullet