vsg: include/vsg/app/ViewMatrix.h Source File

vsg 1.1.3 VulkanSceneGraph library

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ViewMatrix.h
1#pragma once
2
3/* <editor-fold desc="MIT License">
4
5Copyright(c) 2018 Robert Osfield
6
7Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
8
9The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
10
11THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
12
13</editor-fold> */
14
15#include <vsg/core/Inherit.h>
16#include <vsg/maths/transform.h>
17
18namespace vsg
19{
20
22 class VSG_DECLSPEC ViewMatrix : public Inherit<Object, ViewMatrix>
23 {
24 public:
25 virtual dmat4 transform() const = 0;
26
27 virtual dmat4 inverse() const
28 {
29 return vsg::inverse(transform());
30 }
31 };
32 VSG_type_name(vsg::ViewMatrix);
33
35 class VSG_DECLSPEC LookAt : public Inherit<ViewMatrix, LookAt>
36 {
37 public:
38 LookAt() :
39 eye(0.0, 0.0, 0.0),
40 center(0.0, 1.0, 0.0),
41 up(0.0, 0.0, 1.0)
42 {
43 }
44
45 LookAt(const LookAt& lookAt) :
46 Inherit(lookAt),
47 eye(lookAt.eye),
48 center(lookAt.center),
49 up(lookAt.up)
50 {
51 }
52
53 LookAt(const dvec3& in_eye, const dvec3& in_center, const dvec3& in_up) :
54 eye(in_eye),
55 center(in_center),
56 up(in_up)
57 {
58 dvec3 look = normalize(center - eye);
59 dvec3 side = normalize(cross(look, up));
60 up = normalize(cross(side, look));
61 }
62
63 LookAt& operator=(const LookAt& lookAt)
64 {
65 eye = lookAt.eye;
66 center = lookAt.center;
67 up = lookAt.up;
68 return *this;
69 }
70
71 void transform(const dmat4& matrix)
72 {
73 up = normalize(matrix * (eye + up) - matrix * eye);
74 center = matrix * center;
75 eye = matrix * eye;
76 }
77
78 void set(const dmat4& matrix)
79 {
80 up = normalize(matrix * (dvec3(0.0, 0.0, 0.0) + dvec3(0.0, 1.0, 0.0)) - matrix * dvec3(0.0, 0.0, 0.0));
81 center = matrix * dvec3(0.0, 0.0, -1.0);
82 eye = matrix * dvec3(0.0, 0.0, 0.0);
83 }
84
85 dmat4 transform() const override { return lookAt(eye, center, up); }
86
87 void read(Input& input) override;
88 void write(Output& output) const override;
89
90 dvec3 eye;
91 dvec3 center;
92 dvec3 up;
93 };
94 VSG_type_name(vsg::LookAt);
95
97 class RelativeViewMatrix : public Inherit<ViewMatrix, RelativeViewMatrix>
98 {
99 public:
100 RelativeViewMatrix(const dmat4& m, ref_ptr<ViewMatrix> vm) :
101 matrix(m),
102 viewMatrix(vm)
103 {
104 }
105
107 dmat4 transform() const override
108 {
109 return matrix * viewMatrix->transform();
110 }
111
112 dmat4 matrix;
113 ref_ptr<ViewMatrix> viewMatrix;
114 };
115 VSG_type_name(vsg::RelativeViewMatrix);
116
120 class VSG_DECLSPEC TrackingViewMatrix : public Inherit<ViewMatrix, TrackingViewMatrix>
121 {
122 public:
123 template<typename T>
124 explicit TrackingViewMatrix(const dmat4& initial_matrix, const T& path) :
125 matrix(initial_matrix),
126 objectPath(path.begin(), path.end()) {}
127
128 template<typename T>
129 explicit TrackingViewMatrix(const T& path) :
130 objectPath(path.begin(), path.end()) {}
131
133 dmat4 transform() const override;
134 dmat4 inverse() const override;
135
136 dmat4 matrix;
137 RefObjectPath objectPath;
138 };
139 VSG_type_name(vsg::TrackingViewMatrix);
140
141} // namespace vsg
vsg::Inherit
Definition Inherit.h:28
vsg::Input
Definition Input.h:44
vsg::LookAt
LookAt is a ViewMatrix that implements the gluLookAt model for specifying the view matrix.
Definition ViewMatrix.h:36
vsg::Output
Definition Output.h:41
vsg::RelativeViewMatrix
RelativeViewMatrix is a ViewMatrix that decorates another ViewMatrix and pre-multiplies its transform...
Definition ViewMatrix.h:98
vsg::RelativeViewMatrix::transform
dmat4 transform() const override
returns matrix * viewMatrix->transform()
Definition ViewMatrix.h:107
vsg::TrackingViewMatrix
Definition ViewMatrix.h:121
vsg::TrackingViewMatrix::transform
dmat4 transform() const override
returns matrix * computeTransfrom(objectPath)
vsg::ViewMatrix
ViewMatrix is a base class for specifying the Camera view matrix and its inverse.
Definition ViewMatrix.h:23
vsg::ref_ptr
Definition ref_ptr.h:22
vsg::t_mat4< double >
vsg::t_vec3< double >