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* Copyright 2013 The Android Open Source Project
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#pragma once
#include <math/TVecHelpers.h>
#include <math/half.h>
#include <assert.h>
#include <stdint.h>
#include <sys/types.h>
#include <type_traits>
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wgnu-anonymous-struct"
#pragma clang diagnostic ignored "-Wnested-anon-types"
namespace android {
// -------------------------------------------------------------------------------------
namespace details {
template <typename T>
class TVec2 : public TVecProductOperators<TVec2, T>,
public TVecAddOperators<TVec2, T>,
public TVecUnaryOperators<TVec2, T>,
public TVecComparisonOperators<TVec2, T>,
public TVecFunctions<TVec2, T>,
public TVecDebug<TVec2, T> {
enum no_init { NO_INIT };
typedef T value_type;
typedef T& reference;
typedef T const& const_reference;
typedef size_t size_type;
union {
struct { T x, y; };
struct { T s, t; };
struct { T r, g; };
static constexpr size_t SIZE = 2;
inline constexpr size_type size() const { return SIZE; }
// array access
inline constexpr T const& operator[](size_t i) const {
#if __cplusplus >= 201402L
// only possible in C++0x14 with constexpr
assert(i < SIZE);
return (&x)[i];
inline T& operator[](size_t i) {
assert(i < SIZE);
return (&x)[i];
// -----------------------------------------------------------------------
// we want the compiler generated versions for these...
TVec2(const TVec2&) = default;
~TVec2() = default;
TVec2& operator = (const TVec2&) = default;
// constructors
// leaves object uninitialized. use with caution.
constexpr TVec2(no_init) { }
// default constructor
constexpr TVec2() : x(0), y(0) { }
// handles implicit conversion to a tvec4. must not be explicit.
template<typename A, typename = typename std::enable_if<std::is_arithmetic<A>::value >::type>
constexpr TVec2(A v) : x(v), y(v) { }
template<typename A, typename B>
constexpr TVec2(A x, B y) : x(x), y(y) { }
template<typename A>
constexpr TVec2(const TVec2<A>& v) : x(v.x), y(v.y) { }
// cross product works only on vectors of size 2 or 3
template<typename RT>
friend inline
constexpr value_type cross(const TVec2& u, const TVec2<RT>& v) {
return value_type(u.x*v.y - u.y*v.x);
} // namespace details
// ----------------------------------------------------------------------------------------
typedef details::TVec2<double> double2;
typedef details::TVec2<float> float2;
typedef details::TVec2<float> vec2;
typedef details::TVec2<half> half2;
typedef details::TVec2<int32_t> int2;
typedef details::TVec2<uint32_t> uint2;
typedef details::TVec2<int16_t> short2;
typedef details::TVec2<uint16_t> ushort2;
typedef details::TVec2<int8_t> byte2;
typedef details::TVec2<uint8_t> ubyte2;
typedef details::TVec2<bool> bool2;
// ----------------------------------------------------------------------------------------
} // namespace android
#pragma clang diagnostic pop