134 lines
4.0 KiB
C++
Executable File
134 lines
4.0 KiB
C++
Executable File
/*
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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_VEC3_H_
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#define MATH_VEC3_H_
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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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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 TVec3 :
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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:
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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 = 3;
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union {
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T v[SIZE] MATH_CONSTEXPR_INIT;
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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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struct {
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union {
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T x;
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T s;
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T r;
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};
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union {
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struct { T y, z; };
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struct { T t, p; };
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struct { T g, b; };
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TVec2<T> yz;
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TVec2<T> tp;
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TVec2<T> gb;
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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 noexcept {
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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) noexcept {
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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 TVec3() noexcept MATH_DEFAULT_CTOR
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// handles implicit conversion to a tvec3. must not be explicit.
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template<typename A, typename = enable_if_arithmetic_t<A>>
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constexpr TVec3(A v) noexcept : v{ T(v), T(v), T(v) } {}
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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 TVec3(A x, B y, C z) noexcept : v{ T(x), T(y), T(z) } {}
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template<typename A, typename B, typename = enable_if_arithmetic_t<A, B>>
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constexpr TVec3(const TVec2<A>& v, B z) noexcept : v{ T(v[0]), T(v[1]), T(z) } {}
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template<typename A, typename = enable_if_arithmetic_t<A>>
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constexpr TVec3(const TVec3<A>& v) noexcept : v{ T(v[0]), T(v[1]), T(v[2]) } {}
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// cross product works only on vectors of size 3
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template<typename U>
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friend inline constexpr
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TVec3<arithmetic_result_t<T, U>> cross(const TVec3& u, const TVec3<U>& v) noexcept {
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return {
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u[1] * v[2] - u[2] * v[1],
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u[2] * v[0] - u[0] * v[2],
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u[0] * v[1] - u[1] * v[0] };
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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 = details::enable_if_arithmetic_t<T>>
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using vec3 = details::TVec3<T>;
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using double3 = vec3<double>;
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using float3 = vec3<float>;
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using half3 = vec3<half>;
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using int3 = vec3<int32_t>;
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using uint3 = vec3<uint32_t>;
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using short3 = vec3<int16_t>;
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using ushort3 = vec3<uint16_t>;
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using byte3 = vec3<int8_t>;
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using ubyte3 = vec3<uint8_t>;
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using bool3 = vec3<bool>;
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// ----------------------------------------------------------------------------------------
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} // namespace math
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} // namespace filament
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#endif // MATH_VEC3_H_
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