132 lines
4.1 KiB
C++
132 lines
4.1 KiB
C++
/*
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* Copyright 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <math/vec2.h>
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#include <math/half.h>
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#include <stdint.h>
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#include <sys/types.h>
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wgnu-anonymous-struct"
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#pragma clang diagnostic ignored "-Wnested-anon-types"
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namespace android {
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// -------------------------------------------------------------------------------------
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namespace details {
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template <typename T>
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class TVec3 : public TVecProductOperators<TVec3, T>,
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public TVecAddOperators<TVec3, T>,
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public TVecUnaryOperators<TVec3, T>,
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public TVecComparisonOperators<TVec3, T>,
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public TVecFunctions<TVec3, T>,
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public TVecDebug<TVec3, T> {
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public:
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enum no_init { NO_INIT };
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typedef T value_type;
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typedef T& reference;
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typedef T const& const_reference;
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typedef size_t size_type;
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union {
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struct { T x, y, z; };
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struct { T s, t, p; };
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struct { T r, g, b; };
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TVec2<T> xy;
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TVec2<T> st;
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TVec2<T> rg;
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};
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static constexpr size_t SIZE = 3;
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inline constexpr size_type size() const { return SIZE; }
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// array access
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inline constexpr T const& operator[](size_t i) const {
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#if __cplusplus >= 201402L
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// only possible in C++0x14 with constexpr
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assert(i < SIZE);
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#endif
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return (&x)[i];
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}
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inline T& operator[](size_t i) {
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assert(i < SIZE);
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return (&x)[i];
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}
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// -----------------------------------------------------------------------
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// we want the compiler generated versions for these...
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TVec3(const TVec3&) = default;
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~TVec3() = default;
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TVec3& operator = (const TVec3&) = default;
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// constructors
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// leaves object uninitialized. use with caution.
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explicit
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constexpr TVec3(no_init) { }
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// default constructor
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constexpr TVec3() : x(0), y(0), z(0) { }
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// handles implicit conversion to a tvec4. must not be explicit.
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template<typename A, typename = typename std::enable_if<std::is_arithmetic<A>::value >::type>
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constexpr TVec3(A v) : x(static_cast<T>(v)), y(static_cast<T>(v)), z(static_cast<T>(v)) { }
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template<typename A, typename B, typename C>
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constexpr TVec3(A x, B y, C z) : x(static_cast<T>(x)), y(static_cast<T>(y)), z(static_cast<T>(z)) { }
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template<typename A, typename B>
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constexpr TVec3(const TVec2<A>& v, B z) : x(v.x), y(v.y), z(static_cast<T>(z)) { }
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template<typename A>
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explicit
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constexpr TVec3(const TVec3<A>& v) : x(v.x), y(v.y), z(v.z) { }
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// cross product works only on vectors of size 3
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template <typename RT>
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friend inline
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constexpr TVec3 cross(const TVec3& u, const TVec3<RT>& v) {
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return TVec3(
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u.y*v.z - u.z*v.y,
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u.z*v.x - u.x*v.z,
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u.x*v.y - u.y*v.x);
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}
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};
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} // namespace details
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// ----------------------------------------------------------------------------------------
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typedef details::TVec3<double> double3;
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typedef details::TVec3<float> float3;
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typedef details::TVec3<float> vec3;
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typedef details::TVec3<half> half3;
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typedef details::TVec3<int32_t> int3;
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typedef details::TVec3<uint32_t> uint3;
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typedef details::TVec3<int16_t> short3;
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typedef details::TVec3<uint16_t> ushort3;
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typedef details::TVec3<int8_t> byte3;
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typedef details::TVec3<uint8_t> ubyte3;
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typedef details::TVec3<bool> bool3;
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// ----------------------------------------------------------------------------------------
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} // namespace android
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#pragma clang diagnostic pop
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