1 #ifndef MSP_GL_CAMERA_H_
2 #define MSP_GL_CAMERA_H_
4 #include <msp/datafile/objectloader.h>
6 #include "programdata.h"
12 Represents a point of view in 3D space.
14 A Camera provides two matrices. The view matrix is the inverse of the camera's
15 model matrix and transforms coordinates from world space to eye space (the
16 camera's object space). The projection matrix transforms coordinates from eye
19 Orientation of the Camera is determined by look direction and up direction.
20 Look direction corresponds to the negative Z axis direction in eye space. The
21 YZ plane of eye space is aligned to the plane formed by the look and up
22 directions. Setting the up direction to the opposite of gravity direction is
23 an easy way to keep the camera upright.
25 class Camera: public Placeable
28 class Loader: public DataFile::ObjectLoader<Camera>
34 void aspect_ratio(float);
35 void depth_clip(float, float);
36 void field_of_view(float);
37 void look_at(float, float, float);
38 void look_direction(float, float, float);
39 void orthographic(float, float);
40 void position(float, float, float);
41 void up_direction(float, float, float);
45 Geometry::Angle<float> fov = Geometry::Angle<float>::from_turns(0.125f);
47 float aspect = 4.0f/3.0f;
48 // Some compilers have "near" and "far" keywords
49 float clip_near = 0.1f;
50 float clip_far = 10.0f;
51 float frustum_x = 0.0f;
52 float frustum_y = 0.0f;
53 Geometry::Angle<float> rotate;
54 Vector3 position = { 0.0f, 0.0f, 0.0f };
55 Vector3 look_dir = { 0.0f, 0.0f, -1.0f };
56 Vector3 up_dir = { 0.0f, 1.0f, 0.0f };
64 /** Sets the camera projection to perspective, characterised by the vertical
65 field of view. Horizontal FoV is computed with the aspect ratio. */
66 void set_field_of_view(const Geometry::Angle<float> &);
68 /** Sets the camera projection to orthogonal, characterized by the size of
69 the projection region. */
70 void set_orthographic(float, float);
72 void set_aspect_ratio(float);
73 void set_depth_clip(float, float);
75 /** Sets the direction of the frustum axis, which corresponds to the center
76 of the screen. The offset is expressed in terms of the neutral frustum such
77 that -1 is the left or bottom edge and 1 is the right or top edge. */
78 void set_frustum_axis(float, float);
80 /** Apply a rotation to the view frustum after projection. This can be used
81 with rotated displayes without affecting the camera's orientation. */
82 void set_frustum_rotation(const Geometry::Angle<float> &);
84 const Geometry::Angle<float> &get_field_of_view() const { return fov; }
85 bool is_orthographic() const { return fov==Geometry::Angle<float>::zero(); }
86 float get_orthographic_width() const { return height*aspect; }
87 float get_orthographic_height() const { return height; }
88 float get_aspect_ratio() const { return aspect; }
89 float get_near_clip() const { return clip_near; }
90 float get_far_clip() const { return clip_far; }
91 const Geometry::Angle<float> &get_frustum_rotation() const { return rotate; }
93 void set_position(const Vector3 &);
94 void set_look_direction(const Vector3 &);
95 void look_at(const Vector3 &);
96 void set_up_direction(const Vector3 &);
97 const Vector3 &get_position() const { return position; }
98 const Vector3 &get_look_direction() const { return look_dir; }
99 const Vector3 &get_up_direction() const { return up_dir; }
101 virtual void set_matrix(const Matrix &m) { set_object_matrix(m); }
103 /** Sets the position and orientation of the camera from an object matrix. */
104 void set_object_matrix(const Matrix &);
106 /** Returns the view matrix, used to transform coordinates from world space
108 const Matrix &get_view_matrix() const { return view_matrix; }
110 /** Returns the object matrix, used to transform coordinates from eye space
112 const Matrix &get_object_matrix() const { return matrix; }
114 /** Returns the projection matrix. */
115 const Matrix &get_projection_matrix() const { return proj_matrix; }
117 Vector3 project(const Vector4 &) const;
118 Vector3 project(const Vector3 &) const;
119 Vector4 unproject(const Vector4 &) const;
120 Vector3 unproject(const Vector3 &) const;
122 /** Returns a ProgramData object containing the camera matrices. */
123 const ProgramData &get_shader_data() const { return shdata; }
126 void update_projection_matrix();
127 void update_object_matrix();
130 void set_debug_name(const std::string &);