source/game/camera.h

   1 #ifndef MSP_GAME_CAMERA_H_
   2 #define MSP_GAME_CAMERA_H_
   3
   4 #include <msp/geometry/angle.h>
   5 #include <msp/linal/vector.h>
   6 #include "component.h"
   7
   8 namespace Msp::Game {
   9
  10 enum class CameraScaling
  11 {
  12         ORIGINAL_SIZE,
  13         SCALE_TO_FIT,
  14         SCALE_TO_COVER,
  15         STRETCH_TO_FIT
  16 };
  17
  18 struct CameraSetup
  19 {
  20         Geometry::Angle<float> field_of_view_y = Geometry::Angle<float>::from_degrees(60);
  21         LinAl::Vector<float, 2> size = { 16.0f/9.0f, 1.0f };
  22         float near_clip = 0.1f;
  23         float far_clip = 100.0f;
  24         CameraScaling scaling = CameraScaling::SCALE_TO_FIT;
  25         std::string sequence_name;
  26 };
  27
  28 class Camera: public Component
  29 {
  30 public:
  31         using Setup = CameraSetup;
  32
  33 private:
  34         const Setup &setup;
  35         Geometry::Angle<float> fov_y;
  36         LinAl::Vector<float, 2> size;
  37         float height;
  38         float near_clip;
  39         float far_clip;
  40
  41 public:
  42         Camera(Handle<Entity>, const Setup &);
  43
  44         void set_field_of_view(Geometry::Angle<float>, float);
  45         void set_size(const LinAl::Vector<float, 2> &);
  46         bool is_orthographic() const { return fov_y==Geometry::Angle<float>::zero(); }
  47         Geometry::Angle<float> get_fov_vertical() const { return fov_y; }
  48         Geometry::Angle<float> get_fov_horizontal() const { return Geometry::atan(tan(fov_y/2.0f)*get_aspect())*2.0f; }
  49         const LinAl::Vector<float, 2> &get_size() const { return size; }
  50         float get_aspect() const { return size.x/size.y; }
  51         float get_near_clip() const { return near_clip; }
  52         float get_far_clip() const { return far_clip; }
  53         CameraScaling get_scaling() const { return setup.scaling; }
  54         const std::string &get_sequence_name() const { return setup.sequence_name; }
  55 };
  56
  57 } // namespace Msp::Game
  58
  59 #endif