source: trunk/src/matrix.h @ 239

Last change on this file since 239 was 239, checked in by sam, 11 years ago

Implement vector addition, subtraction etc. as well as euclidian distance.

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1//
2// Lol Engine
3//
4// Copyright: (c) 2010-2011 Sam Hocevar <sam@hocevar.net>
5//   This program is free software; you can redistribute it and/or
6//   modify it under the terms of the Do What The Fuck You Want To
7//   Public License, Version 2, as published by Sam Hocevar. See
8//   http://sam.zoy.org/projects/COPYING.WTFPL for more details.
9//
10
11//
12// The Matrix classes
13// ------------------
14//
15
16#if !defined __DH_MATRIX_H__
17#define __DH_MATRIX_H__
18
19#include <cmath>
20
21#define VECTOR_OP(elems, op) \
22    inline Vec##elems<T> operator op(Vec##elems<T> const &val) const \
23    { \
24        Vec##elems<T> ret; \
25        for (int n = 0; n < elems; n++) \
26            ret[n] = (*this)[n] op val[n]; \
27        return ret; \
28    }
29
30#define SCALAR_OP(elems, op) \
31    inline Vec##elems<T> operator op(T const &val) const \
32    { \
33        Vec##elems<T> ret; \
34        for (int n = 0; n < elems; n++) \
35            ret[n] = (*this)[n] op val; \
36        return ret; \
37    }
38
39#define OPERATORS(elems) \
40    T& operator[](int n) { return *(&x + n); } \
41    T const& operator[](int n) const { return *(&x + n); } \
42    \
43    VECTOR_OP(elems, -) \
44    VECTOR_OP(elems, +) \
45    VECTOR_OP(elems, *) \
46    VECTOR_OP(elems, /) \
47    \
48    SCALAR_OP(elems, -) \
49    SCALAR_OP(elems, +) \
50    SCALAR_OP(elems, *) \
51    SCALAR_OP(elems, /) \
52    \
53    inline float len() const \
54    { \
55        T acc = 0; \
56        for (int n = 0; n < elems; n++) \
57            acc += (*this)[n] * (*this)[n]; \
58        return sqrtf((float)acc); \
59    }
60
61template <typename T> struct Vec2
62{
63    Vec2() { x = y = 0; }
64    Vec2(T _x, T _y) { x = _x; y = _y; }
65
66    OPERATORS(2)
67
68    union { T x; T a; T i; };
69    union { T y; T b; T j; };
70};
71
72typedef Vec2<float> Float2;
73typedef Vec2<int> Int2;
74
75template <typename T> struct Vec3
76{
77    Vec3() { x = y = z = 0; }
78    Vec3(T _x, T _y, T _z) { x = _x; y = _y; z = _z; }
79
80    OPERATORS(3)
81
82    union { T x; T a; T i; };
83    union { T y; T b; T j; };
84    union { T z; T c; T k; };
85};
86
87typedef Vec3<float> Float3;
88typedef Vec3<int> Int3;
89
90#endif // __DH_MATRIX_H__
91
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