Add a view sub-library, including a Camera component

[libs/game.git] / source / game / camera.h

diff --git a/source/game/camera.h b/source/game/camera.h
new file mode 100644 (file)
index 0000000..1e8efdd
--- /dev/null
+++ b/source/game/camera.h
@@ -0,0 +1,59 @@
+#ifndef MSP_GAME_CAMERA_H_
+#define MSP_GAME_CAMERA_H_
+
+#include <msp/geometry/angle.h>
+#include <msp/linal/vector.h>
+#include "component.h"
+
+namespace Msp::Game {
+
+enum class CameraScaling
+{
+       ORIGINAL_SIZE,
+       SCALE_TO_FIT,
+       SCALE_TO_COVER,
+       STRETCH_TO_FIT
+};
+
+struct CameraSetup
+{
+       Geometry::Angle<float> field_of_view_y = Geometry::Angle<float>::from_degrees(60);
+       LinAl::Vector<float, 2> size = { 16.0f/9.0f, 1.0f };
+       float near_clip = 0.1f;
+       float far_clip = 100.0f;
+       CameraScaling scaling = CameraScaling::SCALE_TO_FIT;
+       std::string sequence_name;
+};
+
+class Camera: public Component
+{
+public:
+       using Setup = CameraSetup;
+
+private:
+       const Setup &setup;
+       Geometry::Angle<float> fov_y;
+       LinAl::Vector<float, 2> size;
+       float height;
+       float near_clip;
+       float far_clip;
+
+public:
+       Camera(Handle<Entity>, const Setup &);
+
+       void set_field_of_view(Geometry::Angle<float>, float);
+       void set_size(const LinAl::Vector<float, 2> &);
+       bool is_orthographic() const { return fov_y==Geometry::Angle<float>::zero(); }
+       Geometry::Angle<float> get_fov_vertical() const { return fov_y; }
+       Geometry::Angle<float> get_fov_horizontal() const { return Geometry::atan(tan(fov_y/2.0f)*get_aspect())*2.0f; }
+       const LinAl::Vector<float, 2> &get_size() const { return size; }
+       float get_aspect() const { return size.x/size.y; }
+       float get_near_clip() const { return near_clip; }
+       float get_far_clip() const { return far_clip; }
+       CameraScaling get_scaling() const { return setup.scaling; }
+       const std::string &get_sequence_name() const { return setup.sequence_name; }
+};
+
+} // namespace Msp::Game
+
+#endif