unprojector.hpp

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#pragma once
#include "le2d/transform.hpp"
#include "le2d/vector_space.hpp"
#include "le2d/viewport.hpp"
 
namespace le {
class Unprojector {
  public:
    Unprojector() = default;
 
    explicit Unprojector(Transform const& view, glm::vec2 const target_size) : m_inverse_view(view.to_inverse_view()), m_target_size(target_size) {}
 
    explicit Unprojector(Viewport const& viewport, Transform const& view, glm::vec2 framebuffer_size);
 
    [[nodiscard]] auto target_size() const -> glm::vec2 { return m_target_size; }
 
    [[nodiscard]] auto to_target(ndc::vec2 const point) const -> glm::vec2 { return point.to_target(target_size()); }
 
    [[nodiscard]] auto unproject(ndc::vec2 const point) const -> glm::vec2 { return unproject(to_target(point)); }
 
    [[nodiscard]] auto unproject(glm::vec2 const point) const -> glm::vec2 { return m_inverse_view * glm::vec4{point, 0.0f, 1.0f}; }
 
  private:
    glm::mat4 m_inverse_view{1.0f};
    glm::vec2 m_target_size{};
};
} // namespace le