1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef MOZILLA_BASEPOINT4D_H_
#define MOZILLA_BASEPOINT4D_H_
#include "mozilla/Assertions.h"
namespace mozilla {
namespace gfx {
/**
* Do not use this class directly. Subclass it, pass that subclass as the
* Sub parameter, and only use that subclass. This allows methods to safely
* cast 'this' to 'Sub*'.
*/
template <class T, class Sub>
struct BasePoint4D {
union {
struct {
T x, y, z, w;
};
T components[4];
};
// Constructors
BasePoint4D() : x(0), y(0), z(0), w(0) {}
BasePoint4D(T aX, T aY, T aZ, T aW) : x(aX), y(aY), z(aZ), w(aW) {}
void MoveTo(T aX, T aY, T aZ, T aW) { x = aX; y = aY; z = aZ; w = aW; }
void MoveBy(T aDx, T aDy, T aDz, T aDw) { x += aDx; y += aDy; z += aDz; w += aDw; }
// Note that '=' isn't defined so we'll get the
// compiler generated default assignment operator
bool operator==(const Sub& aPoint) const {
return x == aPoint.x && y == aPoint.y &&
z == aPoint.z && w == aPoint.w;
}
bool operator!=(const Sub& aPoint) const {
return x != aPoint.x || y != aPoint.y ||
z != aPoint.z || w != aPoint.w;
}
Sub operator+(const Sub& aPoint) const {
return Sub(x + aPoint.x, y + aPoint.y, z + aPoint.z, w + aPoint.w);
}
Sub operator-(const Sub& aPoint) const {
return Sub(x - aPoint.x, y - aPoint.y, z - aPoint.z, w - aPoint.w);
}
Sub& operator+=(const Sub& aPoint) {
x += aPoint.x;
y += aPoint.y;
z += aPoint.z;
w += aPoint.w;
return *static_cast<Sub*>(this);
}
Sub& operator-=(const Sub& aPoint) {
x -= aPoint.x;
y -= aPoint.y;
z -= aPoint.z;
w -= aPoint.w;
return *static_cast<Sub*>(this);
}
Sub operator*(T aScale) const {
return Sub(x * aScale, y * aScale, z * aScale, w * aScale);
}
Sub operator/(T aScale) const {
return Sub(x / aScale, y / aScale, z / aScale, w / aScale);
}
Sub& operator*=(T aScale) {
x *= aScale;
y *= aScale;
z *= aScale;
w *= aScale;
return *static_cast<Sub*>(this);
}
Sub& operator/=(T aScale) {
x /= aScale;
y /= aScale;
z /= aScale;
w /= aScale;
return *static_cast<Sub*>(this);
}
Sub operator-() const {
return Sub(-x, -y, -z, -w);
}
T& operator[](int aIndex) {
MOZ_ASSERT(aIndex >= 0 && aIndex <= 3, "Invalid array index");
return *((&x)+aIndex);
}
const T& operator[](int aIndex) const {
MOZ_ASSERT(aIndex >= 0 && aIndex <= 3, "Invalid array index");
return *((&x)+aIndex);
}
T DotProduct(const Sub& aPoint) const {
return x * aPoint.x + y * aPoint.y + z * aPoint.z + w * aPoint.w;
}
// Ignores the 4th component!
Sub CrossProduct(const Sub& aPoint) const {
return Sub(y * aPoint.z - aPoint.y * z,
z * aPoint.x - aPoint.z * x,
x * aPoint.y - aPoint.x * y,
0);
}
T Length() const {
return sqrt(x*x + y*y + z*z + w*w);
}
void Normalize() {
*this /= Length();
}
bool HasPositiveWCoord() { return w > 0; }
};
} // namespace gfx
} // namespace mozilla
#endif /* MOZILLA_BASEPOINT4D_H_ */
|
