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_VEC2_H 18 #define UI_VEC2_H 19 20 #include <stdint.h> 21 #include <sys/types.h> 22 23 #define TVEC_IMPLEMENTATION 24 #include <ui/TVecHelpers.h> 25 26 namespace android { 27 // ------------------------------------------------------------------------------------- 28 29 template <typename T> 30 class tvec2 : public TVecProductOperators<tvec2, T>, 31 public TVecAddOperators<tvec2, T>, 32 public TVecUnaryOperators<tvec2, T>, 33 public TVecComparisonOperators<tvec2, T>, 34 public TVecFunctions<tvec2, T> 35 { 36 public: 37 enum no_init { NO_INIT }; 38 typedef T value_type; 39 typedef T& reference; 40 typedef T const& const_reference; 41 typedef size_t size_type; 42 43 union { 44 struct { T x, y; }; 45 struct { T s, t; }; 46 struct { T r, g; }; 47 }; 48 49 enum { SIZE = 2 }; 50 inline static size_type size() { return SIZE; } 51 52 // array access 53 inline T const& operator [] (size_t i) const { return (&x)[i]; } 54 inline T& operator [] (size_t i) { return (&x)[i]; } 55 56 // ----------------------------------------------------------------------- 57 // we don't provide copy-ctor and operator= on purpose 58 // because we want the compiler generated versions 59 60 // constructors 61 62 // leaves object uninitialized. use with caution. 63 explicit tvec2(no_init) { } 64 65 // default constructor 66 tvec2() : x(0), y(0) { } 67 68 // handles implicit conversion to a tvec4. must not be explicit. 69 template<typename A> 70 tvec2(A v) : x(v), y(v) { } 71 72 template<typename A, typename B> 73 tvec2(A x, B y) : x(x), y(y) { } 74 75 template<typename A> 76 explicit tvec2(const tvec2<A>& v) : x(v.x), y(v.y) { } 77 78 template<typename A> 79 tvec2(const Impersonator< tvec2<A> >& v) 80 : x(((const tvec2<A>&)v).x), 81 y(((const tvec2<A>&)v).y) { } 82 }; 83 84 // ---------------------------------------------------------------------------------------- 85 86 typedef tvec2<float> vec2; 87 88 // ---------------------------------------------------------------------------------------- 89 }; // namespace android 90 91 #endif /* UI_VEC4_H */ 92
