22be5f17b4
This change allows for e.g. to call a method that takes double4 with float4 parameters -- just like it would work with double and floats.
116 lines
3.2 KiB
C++
116 lines
3.2 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_VEC2_H_
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#define MATH_VEC2_H_
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#include <math/TVecHelpers.h>
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#include <math/half.h>
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#include <assert.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <type_traits>
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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 TVec2 :
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public TVecProductOperators<TVec2, T>,
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public TVecAddOperators<TVec2, T>,
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public TVecUnaryOperators<TVec2, T>,
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public TVecComparisonOperators<TVec2, T>,
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public TVecFunctions<TVec2, T>,
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public TVecDebug<TVec2, 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 = 2;
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union {
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T v[SIZE];
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struct { T x, y; };
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struct { T s, t; };
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struct { T r, g; };
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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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constexpr TVec2() = default;
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// handles implicit conversion to a tvec4. must not be explicit.
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template<typename A>
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constexpr TVec2(A v) : x(v), y(v) { }
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template<typename A, typename B>
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constexpr TVec2(A x, B y) : x(x), y(y) { }
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template<typename A>
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constexpr TVec2(const TVec2<A>& v) : x(v.x), y(v.y) { }
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// cross product works only on vectors of size 2 or 3
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template <typename RT>
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friend inline
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constexpr value_type cross(const TVec2& u, const TVec2<RT>& v) {
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return value_type(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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template <typename T, typename = typename std::enable_if<std::is_arithmetic<T>::value >::type>
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using vec2 = details::TVec2<T>;
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using double2 = vec2<double>;
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using float2 = vec2<float>;
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using half2 = vec2<half>;
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using int2 = vec2<int32_t>;
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using uint2 = vec2<uint32_t>;
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using short2 = vec2<int16_t>;
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using ushort2 = vec2<uint16_t>;
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using byte2 = vec2<int8_t>;
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using ubyte2 = vec2<uint8_t>;
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using bool2 = vec2<bool>;
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// ----------------------------------------------------------------------------------------
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} // namespace math
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} // namespace filament
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#endif // MATH_VEC2_H_
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