1
2 // vmath.cpp [pengine]
3
4 // Copyright 2004-2006 Jasmine Langridge, jas@jareiko.net
5 // License: GPL version 2 (see included gpl.txt)
6
7
8 #include "pengine.h"
9
10
11
12 template <class T>
construct(const mat44<T> & mat)13 frustum<T> &frustum<T>::construct(const mat44<T> &mat)
14 {
15 side[SideRight] = plane<T>(
16 mat.row[0][3] - mat.row[0][0],
17 mat.row[1][3] - mat.row[1][0],
18 mat.row[2][3] - mat.row[2][0],
19 mat.row[3][3] - mat.row[3][0]);
20 side[SideRight].normalize();
21
22 side[SideLeft] = plane<T>(
23 mat.row[0][3] + mat.row[0][0],
24 mat.row[1][3] + mat.row[1][0],
25 mat.row[2][3] + mat.row[2][0],
26 mat.row[3][3] + mat.row[3][0]);
27 side[SideLeft].normalize();
28
29 side[SideTop] = plane<T>(
30 mat.row[0][3] - mat.row[0][1],
31 mat.row[1][3] - mat.row[1][1],
32 mat.row[2][3] - mat.row[2][1],
33 mat.row[3][3] - mat.row[3][1]);
34 side[SideTop].normalize();
35
36 side[SideBottom] = plane<T>(
37 mat.row[0][3] + mat.row[0][1],
38 mat.row[1][3] + mat.row[1][1],
39 mat.row[2][3] + mat.row[2][1],
40 mat.row[3][3] + mat.row[3][1]);
41 side[SideBottom].normalize();
42
43 side[SideNear] = plane<T>(
44 mat.row[0][3] - mat.row[0][2],
45 mat.row[1][3] - mat.row[1][2],
46 mat.row[2][3] - mat.row[2][2],
47 mat.row[3][3] - mat.row[3][2]);
48 side[SideNear].normalize();
49
50 side[SideFar] = plane<T>(
51 mat.row[0][3] + mat.row[0][2],
52 mat.row[1][3] + mat.row[1][2],
53 mat.row[2][3] + mat.row[2][2],
54 mat.row[3][3] + mat.row[3][2]);
55 side[SideFar].normalize();
56
57 return *this;
58 }
59 template frustum<float> &frustum<float>::construct(const mat44<float> &mat);
60 template frustum<double> &frustum<double>::construct(const mat44<double> &mat);
61
62 template <class T>
isAABBOutside(const vec3<T> & mins,const vec3<T> & maxs) const63 bool frustum<T>::isAABBOutside(const vec3<T> &mins, const vec3<T> &maxs) const
64 {
65 vec3<T> pts[8] = {
66 vec3<T>(mins.x, mins.y, mins.z),
67 vec3<T>(maxs.x, mins.y, mins.z),
68 vec3<T>(mins.x, maxs.y, mins.z),
69 vec3<T>(maxs.x, maxs.y, mins.z),
70 vec3<T>(mins.x, mins.y, maxs.z),
71 vec3<T>(maxs.x, mins.y, maxs.z),
72 vec3<T>(mins.x, maxs.y, maxs.z),
73 vec3<T>(maxs.x, maxs.y, maxs.z)
74 };
75 for (int s = 0; s < 1; ++s) {
76 bool outside = true;
77 for (int p = 0; p < 8; ++p) {
78 //if (side[s].normal * pts[p] + side[s].offset >= 0.0) {
79 if (side[s].normal * pts[p] >= 0.0) {
80 outside = false;
81 break;
82 }
83 }
84 if (outside) return true;
85 }
86
87 return false;
88 }
89 template bool frustum<float>::isAABBOutside(const vec3<float> &mins, const vec3<float> &maxs) const;
90 template bool frustum<double>::isAABBOutside(const vec3<double> &mins, const vec3<double> &maxs) const;
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95