perspective_camera.h

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#ifndef TATOOINE_RENDERING_PERSPECTIVE_CAMERA_H
#define TATOOINE_RENDERING_PERSPECTIVE_CAMERA_H
//==============================================================================
#include <tatooine/rendering/camera.h>
//==============================================================================
namespace tatooine::rendering {
//==============================================================================
template <floating_point Real>
struct perspective_camera : camera_interface<Real> {
 public:
  using real_type   = Real;
  using this_type   = perspective_camera<Real>;
  using parent_type = camera_interface<Real>;
  using parent_type::aspect_ratio;
  using parent_type::eye;
  using parent_type::set_projection_matrix;
  //using parent_type::setup;
  using typename parent_type::mat4;
  using typename parent_type::vec3;
  //----------------------------------------------------------------------------
  // constructors / destructor
  //----------------------------------------------------------------------------
  constexpr perspective_camera(vec3 const& eye, vec3 const& lookat,
                               vec3 const& up, Real const fov, Real const near,
                               Real const far, std::size_t const res_x,
                               std::size_t const res_y)
      : parent_type{
            eye, lookat, up, Vec4<std::size_t>{0, 0, res_x, res_y},
            perspective_matrix(
                fov, static_cast<Real>(res_x) / static_cast<Real>(res_y), near,
                far)} {
    //setup();
  }
  //----------------------------------------------------------------------------
  constexpr perspective_camera(vec3 const& eye, vec3 const& lookat, Real fov,
                               Real const near, Real const far,
                               std::size_t const res_x, std::size_t const res_y)
      : perspective_camera(eye, lookat, vec3{0, 1, 0}, fov, near, far, res_x,
                           res_y) {}
  //----------------------------------------------------------------------------
  constexpr perspective_camera(vec3 const& eye, vec3 const& lookat, Real fov,
                               std::size_t const res_x, std::size_t const res_y)
      : perspective_camera(eye, lookat, vec3{0, 1, 0}, fov, 0.001, 1000, res_x,
                           res_y) {}
  //----------------------------------------------------------------------------
  template <typename EyeReal, typename LookatReal, typename UpReal,
            typename FovReal>
  constexpr perspective_camera(vec<EyeReal, 3> const&    eye,
                               vec<LookatReal, 3> const& lookat,
                               vec<UpReal, 3> const& up, FovReal const fov,
                               std::size_t const res_x, std::size_t const res_y)
      : perspective_camera(eye, lookat, up, fov, 0.001, 1000, res_x, res_y) {}
  //----------------------------------------------------------------------------
  perspective_camera(perspective_camera const &)     = default; 
  perspective_camera(perspective_camera &&) noexcept = default; 
  //----------------------------------------------------------------------------
  auto operator=(perspective_camera const&)
      -> perspective_camera& = default;
  auto operator=(perspective_camera&&) noexcept
      -> perspective_camera& = default;
  //----------------------------------------------------------------------------
  ~perspective_camera() = default;
  //============================================================================
  auto constexpr set_projection_matrix(Real const fov, Real const near,
                                       Real const far) -> void {
    set_projection_matrix(
        perspective_matrix(fov, this->aspect_ratio(), near, far));
  }
};
//==============================================================================
template <typename EyeReal, typename LookatReal, typename UpReal,
          typename FovReal, typename NearReal, typename FarReal>
perspective_camera(vec<EyeReal, 3> const&, vec<LookatReal, 3> const&,
                   vec<UpReal, 3> const&, FovReal const, NearReal const,
                   FarReal const, std::size_t const, std::size_t const)
    -> perspective_camera<
        common_type<EyeReal, LookatReal, UpReal, FovReal, NearReal, FarReal>>;
//------------------------------------------------------------------------------
template <typename EyeReal, typename LookatReal, typename FovReal,
          typename NearReal, typename FarReal>
perspective_camera(vec<EyeReal, 3> const&, vec<LookatReal, 3> const&,
                   FovReal const, NearReal const, FarReal const,
                   std::size_t const, std::size_t const)
    -> perspective_camera<
        common_type<EyeReal, LookatReal, FovReal, NearReal, FarReal>>;
//------------------------------------------------------------------------------
template <typename EyeReal, typename LookatReal, typename FovReal>
perspective_camera(vec<EyeReal, 3> const&, vec<LookatReal, 3> const&,
                   FovReal const, std::size_t const, std::size_t const)
    -> perspective_camera<common_type<EyeReal, LookatReal, FovReal>>;
//------------------------------------------------------------------------------
template <typename EyeReal, typename LookatReal, typename UpReal,
          typename FovReal>
perspective_camera(vec<EyeReal, 3> const&, vec<LookatReal, 3> const&,
                   vec<UpReal, 3> const&, FovReal const, std::size_t const,
                   std::size_t const)
    -> perspective_camera<
        common_type<EyeReal, LookatReal, UpReal, std::decay_t<FovReal>>>;
//==============================================================================
}  // namespace tatooine::rendering
//==============================================================================
#endif