5ed07639af
the C++ standard says: if T is a class type with a default constructor that is neither user-provided nor deleted (that is, it may be a class with an implicitly-defined or defaulted default constructor), the object is zero-initialized and then it is default-initialized if it has a non-trivial default constructor Unfortunately, MSVC always calls the default constructor, even if it is trivial, which breaks constexpr-ness. To workaround this, we're always zero-initializing TVecN<> Also removed constexpr from default constructors, since they never can be constexpr as they're not initializing the vector.
135 lines
4.1 KiB
C++
135 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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#ifndef MATH_VEC4_H_
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#define MATH_VEC4_H_
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#include <math/vec3.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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namespace filament {
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namespace math {
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// -------------------------------------------------------------------------------------
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namespace details {
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template<typename T>
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class MATH_EMPTY_BASES TVec4 :
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public TVecProductOperators<TVec4, T>,
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public TVecAddOperators<TVec4, T>,
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public TVecUnaryOperators<TVec4, T>,
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public TVecComparisonOperators<TVec4, T>,
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public TVecFunctions<TVec4, T>,
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public TVecDebug<TVec4, T> {
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public:
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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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static constexpr size_t SIZE = 4;
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union {
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T v[SIZE] MATH_CONSTEXPR_INIT;
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TVec2<T> xy, st, rg;
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TVec3<T> xyz, stp, rgb;
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struct {
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union { T x, s, r; };
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union {
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TVec2<T> yz, tp, gb;
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TVec3<T> yzw, tpq, gba;
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struct {
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union { T y, t, g; };
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union {
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TVec2<T> zw, pq, ba;
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struct { T z, w; };
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struct { T p, q; };
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struct { T b, a; };
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};
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};
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};
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};
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};
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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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// only possible in C++0x14 with constexpr
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assert(i < SIZE);
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return v[i];
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}
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inline constexpr T& operator[](size_t i) {
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assert(i < SIZE);
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return v[i];
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}
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// constructors
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// default constructor
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MATH_DEFAULT_CTOR_CONSTEXPR TVec4() MATH_DEFAULT_CTOR
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// handles implicit conversion to a tvec4. must not be explicit.
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template<typename A, typename = enable_if_arithmetic_t<A>>
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constexpr TVec4(A v) : v{ T(v), T(v), T(v), T(v) } {}
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template<typename A, typename B, typename C, typename D,
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typename = enable_if_arithmetic_t<A, B, C, D>>
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constexpr TVec4(A x, B y, C z, D w) : v{ T(x), T(y), T(z), T(w) } {}
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template<typename A, typename B, typename C,
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typename = enable_if_arithmetic_t<A, B, C>>
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constexpr TVec4(const TVec2<A>& v, B z, C w) : v{ T(v[0]), T(v[1]), T(z), T(w) } {}
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template<typename A, typename B, typename = enable_if_arithmetic_t<A, B>>
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constexpr TVec4(const TVec2<A>& v, const TVec2<B>& w) : v{
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T(v[0]), T(v[1]), T(w[0]), T(w[1]) } {}
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template<typename A, typename B, typename = enable_if_arithmetic_t<A, B>>
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constexpr TVec4(const TVec3<A>& v, B w) : v{ T(v[0]), T(v[1]), T(v[2]), T(w) } {}
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template<typename A, typename = enable_if_arithmetic_t<A>>
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constexpr TVec4(const TVec4<A>& v) : v{ T(v[0]), T(v[1]), T(v[2]), T(v[3]) } {}
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};
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} // namespace details
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// ----------------------------------------------------------------------------------------
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template<typename T, typename = details::enable_if_arithmetic_t<T>>
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using vec4 = details::TVec4<T>;
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using double4 = vec4<double>;
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using float4 = vec4<float>;
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using half4 = vec4<half>;
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using int4 = vec4<int32_t>;
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using uint4 = vec4<uint32_t>;
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using short4 = vec4<int16_t>;
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using ushort4 = vec4<uint16_t>;
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using byte4 = vec4<int8_t>;
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using ubyte4 = vec4<uint8_t>;
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using bool4 = vec4<bool>;
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// ----------------------------------------------------------------------------------------
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} // namespace math
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} // namespace filament
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#endif // MATH_VEC4_H_
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