1 /* 2 * Copyright 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef UI_VEC3_H 18 #define UI_VEC3_H 19 20 #include <stdint.h> 21 #include <sys/types.h> 22 23 #include <ui/vec2.h> 24 25 namespace android { 26 // ------------------------------------------------------------------------------------- 27 28 template <typename T> 29 class tvec3 : public TVecProductOperators<tvec3, T>, 30 public TVecAddOperators<tvec3, T>, 31 public TVecUnaryOperators<tvec3, T>, 32 public TVecComparisonOperators<tvec3, T>, 33 public TVecFunctions<tvec3, T> 34 { 35 public: 36 enum no_init { NO_INIT }; 37 typedef T value_type; 38 typedef T& reference; 39 typedef T const& const_reference; 40 typedef size_t size_type; 41 42 union { 43 struct { T x, y, z; }; 44 struct { T s, t, p; }; 45 struct { T r, g, b; }; 46 Impersonator< tvec2<T> > xy; 47 Impersonator< tvec2<T> > st; 48 Impersonator< tvec2<T> > rg; 49 }; 50 51 enum { SIZE = 3 }; 52 inline static size_type size() { return SIZE; } 53 54 // array access 55 inline T const& operator [] (size_t i) const { return (&x)[i]; } 56 inline T& operator [] (size_t i) { return (&x)[i]; } 57 58 // ----------------------------------------------------------------------- 59 // we don't provide copy-ctor and operator= on purpose 60 // because we want the compiler generated versions 61 62 // constructors 63 // leaves object uninitialized. use with caution. 64 explicit tvec3(no_init) { } 65 66 // default constructor 67 tvec3() : x(0), y(0), z(0) { } 68 69 // handles implicit conversion to a tvec4. must not be explicit. 70 template<typename A> 71 tvec3(A v) : x(v), y(v), z(v) { } 72 73 template<typename A, typename B, typename C> 74 tvec3(A x, B y, C z) : x(x), y(y), z(z) { } 75 76 template<typename A, typename B> 77 tvec3(const tvec2<A>& v, B z) : x(v.x), y(v.y), z(z) { } 78 79 template<typename A> 80 explicit tvec3(const tvec3<A>& v) : x(v.x), y(v.y), z(v.z) { } 81 82 template<typename A> 83 tvec3(const Impersonator< tvec3<A> >& v) 84 : x(((const tvec3<A>&)v).x), 85 y(((const tvec3<A>&)v).y), 86 z(((const tvec3<A>&)v).z) { } 87 88 template<typename A, typename B> 89 tvec3(const Impersonator< tvec2<A> >& v, B z) 90 : x(((const tvec2<A>&)v).x), 91 y(((const tvec2<A>&)v).y), 92 z(z) { } 93 94 // cross product works only on vectors of size 3 95 template <typename RT> 96 friend inline 97 tvec3 __attribute__((pure)) cross(const tvec3& u, const tvec3<RT>& v) { 98 return tvec3( 99 u.y*v.z - u.z*v.y, 100 u.z*v.x - u.x*v.z, 101 u.x*v.y - u.y*v.x); 102 } 103 }; 104 105 106 // ---------------------------------------------------------------------------------------- 107 108 typedef tvec3<float> vec3; 109 110 // ---------------------------------------------------------------------------------------- 111 }; // namespace android 112 113 #endif /* UI_VEC4_H */ 114
