]> Dogcows Code - chaz/yoink/blob - src/Moof/Frustum.cc
initial working frustum culling implementation
[chaz/yoink] / src / Moof / Frustum.cc
1
2 /*******************************************************************************
3
4 Copyright (c) 2009, Charles McGarvey
5 All rights reserved.
6
7 Redistribution and use in source and binary forms, with or without
8 modification, are permitted provided that the following conditions are met:
9
10 * Redistributions of source code must retain the above copyright notice,
11 this list of conditions and the following disclaimer.
12 * Redistributions in binary form must reproduce the above copyright notice,
13 this list of conditions and the following disclaimer in the documentation
14 and/or other materials provided with the distribution.
15
16 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
20 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26
27 *******************************************************************************/
28
29 #include <Moof/Aabb.hh>
30 #include <Moof/Frustum.hh>
31 #include <Moof/Sphere.hh>
32
33
34 namespace Mf {
35
36
37 void Frustum::init(const Matrix4& modelview, const Matrix4& projection)
38 {
39 Scalar planes[6][4];
40
41 cml::extract_frustum_planes(modelview, projection, planes,
42 cml::z_clip_neg_one);
43
44 planes_[0] = Plane(planes[0][0], planes[0][1], planes[0][2], planes[0][3]);
45 planes_[1] = Plane(planes[1][0], planes[1][1], planes[1][2], planes[1][3]);
46 planes_[2] = Plane(planes[2][0], planes[2][1], planes[2][2], planes[2][3]);
47 planes_[3] = Plane(planes[3][0], planes[3][1], planes[3][2], planes[3][3]);
48 planes_[4] = Plane(planes[4][0], planes[4][1], planes[4][2], planes[4][3]);
49 planes_[5] = Plane(planes[5][0], planes[5][1], planes[5][2], planes[5][3]);
50 }
51
52 void Frustum::init(const Matrix4& modelview, Scalar fovy, Scalar aspect,
53 Scalar near, Scalar far)
54 {
55 Matrix4 projection;
56
57 cml::matrix_perspective_yfov_RH(projection, fovy, aspect, near, far,
58 cml::z_clip_neg_one);
59
60 init(modelview, projection);
61 }
62
63 Frustum::Collision Frustum::containsAabb(const Aabb& aabb) const
64 {
65 Vector3 corners[8];
66 int nTotalInside = 0;
67
68 aabb.getCorners(corners);
69
70 for (int i = 0; i < 6; ++i)
71 {
72 int nInside = 8;
73
74 for (int j = 0; j < 8; ++j)
75 {
76 if (planes_[i].intersectsPoint(corners[j]) ==
77 Plane::NEGATIVE)
78 {
79 --nInside;
80 }
81 }
82
83 if (nInside == 0) return OUTSIDE;
84 else if (nInside == 8) ++nTotalInside;
85 }
86
87 if (nTotalInside == 6) return INSIDE;
88 else return INTERSECT;
89 }
90
91
92 Frustum::Collision Frustum::containsSphere(const Sphere& sphere) const
93 {
94 for (int i = 0; i < 6; ++i)
95 {
96 Plane::Halfspace halfspace = planes_[i].intersectsSphere(sphere);
97
98 if (halfspace == Plane::NEGATIVE) return OUTSIDE;
99 else if (halfspace == Plane::INTERSECT) return INTERSECT;
100 }
101
102 return INSIDE;
103 }
104
105
106 } // namespace Mf
107
108 /** vim: set ts=4 sw=4 tw=80: *************************************************/
109
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