@@ -11,85 +11,91 @@ namespace lepus
1111{
1212 namespace gfx
1313 {
14- class Camera
15- {
16- protected:
17- lepus::math::Transform m_Transform;
18- float m_FOV;
19- float m_Near, m_Far;
20-
21- public:
22- Camera ()
23- {
24- m_FOV = LEPUS_GFX_CAMERA_DEFAULT_FOV;
25- m_Near = LEPUS_GFX_CAMERA_DEFAULT_CLIP_NEAR;
26- m_Far = LEPUS_GFX_CAMERA_DEFAULT_CLIP_FAR;
27- m_Transform = lepus::math::Transform ();
28- }
29-
30- // / @brief Gets field of view
31- // / @return Camera's field of view (in degrees)
32- inline float FOV () const
33- {
34- return m_FOV;
35- }
36-
37- // / @brief Sets field of view
38- // / @param fov New field of view (in degrees) to be used by this camera
39- inline void FOV (float fov)
40- {
41- m_FOV = fov;
42- }
43-
44- // / @brief Gets the Camera's Transform.
45- // / @return A reference to the Transform used by the Camera.
46- inline lepus::math::Transform& Transform () { return m_Transform; }
47-
48- // / @brief Generates a perspective projection matrix using the current FOV angle and near/far clipping planes.
49- // / @return A 4x4 projection matrix that can be used to apply camera perspective to vertices.
50- lepus::math::Matrix4x4 BuildPerspectiveMatrix () const
51- {
52- lepus::math::Matrix4x4 projMatrix = lepus::math::Matrix4x4 ();
53-
54- float hypot = tanf ((180 .f - m_FOV) * DEG2RAD * 0 .5f );
55-
56- projMatrix.set <0 , 0 >(hypot );
57- projMatrix.set <1 , 1 >(hypot );
58-
59- projMatrix.set <2 , 2 >(-(m_Far / (m_Far - m_Near)));
60- projMatrix.set <2 , 3 >(-((m_Far * m_Near) / (m_Far - m_Near)));
61-
62- projMatrix.set <3 , 2 >(-1 .f );
63-
64- return projMatrix;
65- }
66-
67- // / @brief Generates a look-at view matrix using the Camera's Transform.
68- // / @return A 4x4 view matrix that can be used to rotate and translate vertices according to eye position and camera orientation.
69- lepus::math::Matrix4x4 BuildViewMatrix () const
70- {
71- lepus::math::Matrix4x4 pos = lepus::math::Matrix4x4::Identity ();
72-
73- auto f = m_Transform.Forward () * (-1 .f / m_Transform.Forward ().Magnitude ());
74- auto s = m_Transform.Right () * (1 .f / m_Transform.Right ().Magnitude ());
75- auto u = m_Transform.Up () * (1 .f / m_Transform.Up ().Magnitude ());
76-
77- auto e = m_Transform.Origin ();
78-
79- pos.set <0 , 3 >(-e.x ());
80- pos.set <1 , 3 >(-e.y ());
81- pos.set <2 , 3 >(-e.z ());
82-
83- lepus::math::Matrix4x4 lookAt = lepus::math::Matrix4x4::Identity ();
84-
85- lookAt.set <0 , 0 >(s.x ());lookAt.set <0 , 1 >(s.y ());lookAt.set <0 , 2 >(s.z ());
86- lookAt.set <1 , 0 >(u.x ());lookAt.set <1 , 1 >(u.y ());lookAt.set <1 , 2 >(u.z ());
87- lookAt.set <2 , 0 >(f.x ());lookAt.set <2 , 1 >(f.y ());lookAt.set <2 , 2 >(f.z ());
88-
89- return lookAt.Multiply (pos);
90- }
91- };
92- }
93- }
14+ class Camera
15+ {
16+ protected:
17+ lepus::math::Transform m_Transform;
18+ float m_FOV;
19+ float m_Near, m_Far;
20+
21+ public:
22+ Camera ()
23+ {
24+ m_FOV = LEPUS_GFX_CAMERA_DEFAULT_FOV;
25+ m_Near = LEPUS_GFX_CAMERA_DEFAULT_CLIP_NEAR;
26+ m_Far = LEPUS_GFX_CAMERA_DEFAULT_CLIP_FAR;
27+ m_Transform = lepus::math::Transform ();
28+ }
29+
30+ // / @brief Gets field of view
31+ // / @return Camera's field of view (in degrees)
32+ inline float FOV () const
33+ {
34+ return m_FOV;
35+ }
36+
37+ // / @brief Sets field of view
38+ // / @param fov New field of view (in degrees) to be used by this camera
39+ inline void FOV (float fov)
40+ {
41+ m_FOV = fov;
42+ }
43+
44+ // / @brief Gets the Camera's Transform.
45+ // / @return A reference to the Transform used by the Camera.
46+ inline lepus::math::Transform& Transform () { return m_Transform; }
47+
48+ // / @brief Generates a perspective projection matrix using the current FOV angle and near/far clipping planes.
49+ // / @return A 4x4 projection matrix that can be used to apply camera perspective to vertices.
50+ lepus::math::Matrix4x4 BuildPerspectiveMatrix () const
51+ {
52+ lepus::math::Matrix4x4 projMatrix = lepus::math::Matrix4x4 ();
53+
54+ float hypot = tanf ((180 .f - m_FOV) * (float )(DEG2RAD) * 0 .5f );
55+
56+ projMatrix.set <0 , 0 >(hypot );
57+ projMatrix.set <1 , 1 >(hypot );
58+
59+ projMatrix.set <2 , 2 >(-(m_Far / (m_Far - m_Near)));
60+ projMatrix.set <2 , 3 >(-((m_Far * m_Near) / (m_Far - m_Near)));
61+
62+ projMatrix.set <3 , 2 >(-1 .f );
63+
64+ return projMatrix;
65+ }
66+
67+ // / @brief Generates a look-at view matrix using the Camera's Transform.
68+ // / @return A 4x4 view matrix that can be used to rotate and translate vertices according to eye position and camera orientation.
69+ lepus::math::Matrix4x4 BuildViewMatrix () const
70+ {
71+ lepus::math::Matrix4x4 pos = lepus::math::Matrix4x4::Identity ();
72+
73+ auto f = m_Transform.Forward () * (-1 .f / m_Transform.Forward ().Magnitude ());
74+ auto s = m_Transform.Right () * (1 .f / m_Transform.Right ().Magnitude ());
75+ auto u = m_Transform.Up () * (1 .f / m_Transform.Up ().Magnitude ());
76+
77+ auto e = m_Transform.Origin ();
78+
79+ pos.set <0 , 3 >(-e.x ());
80+ pos.set <1 , 3 >(-e.y ());
81+ pos.set <2 , 3 >(-e.z ());
82+
83+ lepus::math::Matrix4x4 lookAt = lepus::math::Matrix4x4::Identity ();
84+
85+ lookAt.set <0 , 0 >(s.x ());
86+ lookAt.set <0 , 1 >(s.y ());
87+ lookAt.set <0 , 2 >(s.z ());
88+ lookAt.set <1 , 0 >(u.x ());
89+ lookAt.set <1 , 1 >(u.y ());
90+ lookAt.set <1 , 2 >(u.z ());
91+ lookAt.set <2 , 0 >(f.x ());
92+ lookAt.set <2 , 1 >(f.y ());
93+ lookAt.set <2 , 2 >(f.z ());
94+
95+ return lookAt.Multiply (pos);
96+ }
97+ };
98+ } // namespace gfx
99+ } // namespace lepus
94100
95101#endif
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