1 | // |
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2 | // Lol Engine |
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3 | // |
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4 | // Copyright: (c) 2010-2011 Sam Hocevar <sam@hocevar.net> |
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5 | // This program is free software; you can redistribute it and/or |
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6 | // modify it under the terms of the Do What The Fuck You Want To |
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7 | // Public License, Version 2, as published by Sam Hocevar. See |
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8 | // http://sam.zoy.org/projects/COPYING.WTFPL for more details. |
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9 | // |
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10 | |
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11 | // |
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12 | // The Matrix classes |
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13 | // ------------------ |
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14 | // |
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15 | |
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16 | #if !defined __DH_MATRIX_H__ |
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17 | #define __DH_MATRIX_H__ |
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18 | |
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19 | #include <cmath> |
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20 | |
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21 | #define VECTOR_OP(elems, op) \ |
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22 | template<typename U> \ |
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23 | inline Vec##elems<T> operator op(Vec##elems<U> const &val) const \ |
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24 | { \ |
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25 | Vec##elems<T> ret; \ |
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26 | for (int n = 0; n < elems; n++) \ |
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27 | ret[n] = (*this)[n] op val[n]; \ |
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28 | return ret; \ |
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29 | } |
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30 | |
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31 | #define BOOL_OP(elems, op, ret) \ |
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32 | inline bool operator op(Vec##elems<T> const &val) const \ |
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33 | { \ |
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34 | for (int n = 0; n < elems; n++) \ |
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35 | if ((*this)[n] != val[n]) \ |
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36 | return ret; \ |
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37 | return !ret; \ |
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38 | } |
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39 | |
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40 | #define SCALAR_OP(elems, op) \ |
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41 | inline Vec##elems<T> operator op(T const &val) const \ |
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42 | { \ |
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43 | Vec##elems<T> ret; \ |
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44 | for (int n = 0; n < elems; n++) \ |
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45 | ret[n] = (*this)[n] op val; \ |
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46 | return ret; \ |
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47 | } |
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48 | |
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49 | #define CAST_OP(elems, dest) \ |
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50 | inline operator Vec##dest<T>() const \ |
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51 | { \ |
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52 | Vec##dest<T> ret; \ |
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53 | for (int n = 0; n < elems && n < dest; n++) \ |
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54 | ret[n] = (*this)[n]; \ |
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55 | return ret; \ |
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56 | } |
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57 | |
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58 | #define OPERATORS(elems) \ |
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59 | inline T& operator[](int n) { return *(&x + n); } \ |
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60 | inline T const& operator[](int n) const { return *(&x + n); } \ |
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61 | \ |
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62 | VECTOR_OP(elems, -) \ |
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63 | VECTOR_OP(elems, +) \ |
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64 | VECTOR_OP(elems, *) \ |
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65 | VECTOR_OP(elems, /) \ |
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66 | \ |
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67 | BOOL_OP(elems, ==, false) \ |
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68 | BOOL_OP(elems, !=, true) \ |
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69 | \ |
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70 | SCALAR_OP(elems, -) \ |
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71 | SCALAR_OP(elems, +) \ |
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72 | SCALAR_OP(elems, *) \ |
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73 | SCALAR_OP(elems, /) \ |
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74 | \ |
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75 | CAST_OP(elems, 2) \ |
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76 | CAST_OP(elems, 3) \ |
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77 | CAST_OP(elems, 4) \ |
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78 | \ |
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79 | template<typename U> \ |
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80 | inline operator Vec##elems<U>() const \ |
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81 | { \ |
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82 | Vec##elems<U> ret; \ |
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83 | for (int n = 0; n < elems; n++) \ |
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84 | ret[n] = static_cast<U>((*this)[n]); \ |
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85 | return ret; \ |
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86 | } \ |
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87 | \ |
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88 | inline T sqlen() const \ |
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89 | { \ |
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90 | T acc = 0; \ |
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91 | for (int n = 0; n < elems; n++) \ |
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92 | acc += (*this)[n] * (*this)[n]; \ |
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93 | return acc; \ |
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94 | } \ |
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95 | \ |
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96 | inline float len() const \ |
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97 | { \ |
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98 | return sqrtf((float)sqlen()); \ |
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99 | } |
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100 | |
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101 | template <typename T> struct Vec2; |
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102 | template <typename T> struct Vec3; |
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103 | template <typename T> struct Vec4; |
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104 | |
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105 | template <typename T> struct Vec2 |
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106 | { |
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107 | inline Vec2() { } |
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108 | inline Vec2(T val) { x = y = val; } |
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109 | inline Vec2(T _x, T _y) { x = _x; y = _y; } |
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110 | |
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111 | OPERATORS(2) |
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112 | |
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113 | union { T x; T a; T i; }; |
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114 | union { T y; T b; T j; }; |
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115 | }; |
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116 | |
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117 | typedef Vec2<float> float2; |
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118 | typedef Vec2<int> int2; |
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119 | |
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120 | template <typename T> struct Vec3 |
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121 | { |
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122 | inline Vec3() { } |
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123 | inline Vec3(T val) { x = y = z = val; } |
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124 | inline Vec3(T _x, T _y, T _z) { x = _x; y = _y; z = _z; } |
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125 | |
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126 | OPERATORS(3) |
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127 | |
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128 | union { T x; T a; T i; }; |
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129 | union { T y; T b; T j; }; |
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130 | union { T z; T c; T k; }; |
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131 | }; |
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132 | |
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133 | typedef Vec3<float> float3; |
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134 | typedef Vec3<int> int3; |
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135 | |
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136 | template <typename T> struct Vec4 |
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137 | { |
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138 | inline Vec4() { } |
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139 | inline Vec4(T val) { x = y = z = w = val; } |
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140 | inline Vec4(T _x, T _y, T _z, T _w) { x = _x; y = _y; z = _z; w = _w; } |
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141 | |
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142 | OPERATORS(4) |
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143 | |
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144 | union { T x; T a; T i; }; |
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145 | union { T y; T b; T j; }; |
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146 | union { T z; T c; T k; }; |
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147 | union { T w; T d; T l; }; |
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148 | }; |
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149 | |
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150 | typedef Vec4<float> float4; |
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151 | typedef Vec4<int> int4; |
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152 | |
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153 | #define SCALAR_GLOBAL(elems, op, U) \ |
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154 | template<typename T> \ |
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155 | static inline Vec##elems<U> operator op(U const &val, \ |
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156 | Vec##elems<T> const &that) \ |
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157 | { \ |
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158 | Vec##elems<U> ret; \ |
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159 | for (int n = 0; n < elems; n++) \ |
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160 | ret[n] = val op that[n]; \ |
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161 | return ret; \ |
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162 | } |
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163 | |
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164 | #define SCALAR_GLOBAL2(elems, op) \ |
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165 | SCALAR_GLOBAL(elems, op, int) \ |
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166 | SCALAR_GLOBAL(elems, op, float) |
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167 | |
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168 | #define GLOBALS(elems) \ |
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169 | SCALAR_GLOBAL2(elems, -) \ |
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170 | SCALAR_GLOBAL2(elems, +) \ |
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171 | SCALAR_GLOBAL2(elems, *) \ |
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172 | SCALAR_GLOBAL2(elems, /) |
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173 | |
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174 | GLOBALS(2) |
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175 | GLOBALS(3) |
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176 | GLOBALS(4) |
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177 | |
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178 | template <typename T> struct Mat4 |
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179 | { |
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180 | inline Mat4() { } |
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181 | inline Mat4(T val) |
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182 | { |
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183 | for (int j = 0; j < 4; j++) |
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184 | for (int i = 0; i < 4; i++) |
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185 | v[i][j] = (i == j) ? val : 0; |
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186 | } |
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187 | inline Mat4(Vec4<T> v0, Vec4<T> v1, Vec4<T> v2, Vec4<T> v3) |
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188 | { |
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189 | v[0] = v0; v[1] = v1; v[2] = v2; v[3] = v3; |
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190 | } |
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191 | |
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192 | inline Vec4<T>& operator[](int n) { return v[n]; } |
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193 | inline Vec4<T> const& operator[](int n) const { return v[n]; } |
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194 | |
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195 | T det() const; |
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196 | Mat4<T> invert() const; |
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197 | |
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198 | static Mat4<T> frustum(T left, T right, T bottom, T top, T near, T far); |
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199 | static Mat4<T> perspective(T theta, T width, T height, T near, T far); |
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200 | |
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201 | inline Mat4<T> operator +(Mat4<T> const val) const |
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202 | { |
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203 | Mat4<T> ret; |
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204 | for (int j = 0; j < 4; j++) |
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205 | for (int i = 0; i < 4; i++) |
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206 | ret[i][j] = v[i][j] + val[i][j]; |
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207 | return ret; |
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208 | } |
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209 | |
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210 | inline Mat4<T> operator -(Mat4<T> const val) const |
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211 | { |
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212 | Mat4<T> ret; |
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213 | for (int j = 0; j < 4; j++) |
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214 | for (int i = 0; i < 4; i++) |
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215 | ret[i][j] = v[i][j] - val[i][j]; |
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216 | return ret; |
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217 | } |
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218 | |
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219 | inline Mat4<T> operator *(Mat4<T> const val) const |
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220 | { |
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221 | Mat4<T> ret; |
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222 | for (int j = 0; j < 4; j++) |
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223 | for (int i = 0; i < 4; i++) |
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224 | { |
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225 | T tmp = 0; |
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226 | for (int k = 0; k < 4; k++) |
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227 | tmp += v[k][j] * val[i][k]; |
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228 | ret[i][j] = tmp; |
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229 | } |
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230 | return ret; |
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231 | } |
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232 | |
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233 | inline Vec4<T> operator *(Vec4<T> const val) const |
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234 | { |
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235 | Vec4<T> ret; |
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236 | for (int j = 0; j < 4; j++) |
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237 | { |
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238 | T tmp = 0; |
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239 | for (int i = 0; i < 4; i++) |
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240 | tmp += v[i][j] * val[i]; |
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241 | ret[j] = tmp; |
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242 | } |
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243 | return ret; |
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244 | } |
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245 | |
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246 | Vec4<T> v[4]; |
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247 | }; |
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248 | |
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249 | typedef Mat4<float> float4x4; |
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250 | typedef Mat4<int> int4x4; |
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251 | |
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252 | #endif // __DH_MATRIX_H__ |
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253 | |
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