114 lines
3.4 KiB
C++
Executable File
114 lines
3.4 KiB
C++
Executable File
/*
|
|
* 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
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#ifndef MATH_VEC2_H_
|
|
#define MATH_VEC2_H_
|
|
|
|
#include <math/TVecHelpers.h>
|
|
#include <math/half.h>
|
|
#include <assert.h>
|
|
#include <stdint.h>
|
|
#include <sys/types.h>
|
|
#include <type_traits>
|
|
|
|
|
|
namespace filament {
|
|
namespace math {
|
|
// -------------------------------------------------------------------------------------
|
|
|
|
namespace details {
|
|
|
|
template<typename T>
|
|
class MATH_EMPTY_BASES TVec2 :
|
|
public TVecProductOperators<TVec2, T>,
|
|
public TVecAddOperators<TVec2, T>,
|
|
public TVecUnaryOperators<TVec2, T>,
|
|
public TVecComparisonOperators<TVec2, T>,
|
|
public TVecFunctions<TVec2, T> {
|
|
public:
|
|
typedef T value_type;
|
|
typedef T& reference;
|
|
typedef T const& const_reference;
|
|
typedef size_t size_type;
|
|
static constexpr size_t SIZE = 2;
|
|
|
|
union {
|
|
T v[SIZE] MATH_CONSTEXPR_INIT;
|
|
struct { T x, y; };
|
|
struct { T s, t; };
|
|
struct { T r, g; };
|
|
};
|
|
|
|
inline constexpr size_type size() const { return SIZE; }
|
|
|
|
// array access
|
|
inline constexpr T const& operator[](size_t i) const noexcept {
|
|
assert(i < SIZE);
|
|
return v[i];
|
|
}
|
|
|
|
inline constexpr T& operator[](size_t i) noexcept {
|
|
assert(i < SIZE);
|
|
return v[i];
|
|
}
|
|
|
|
// constructors
|
|
|
|
// default constructor
|
|
MATH_DEFAULT_CTOR_CONSTEXPR TVec2() MATH_DEFAULT_CTOR
|
|
|
|
// handles implicit conversion to a tvec4. must not be explicit.
|
|
template<typename A, typename = enable_if_arithmetic_t<A>>
|
|
constexpr TVec2(A v) noexcept : v{ T(v), T(v) } {}
|
|
|
|
template<typename A, typename B, typename = enable_if_arithmetic_t<A, B>>
|
|
constexpr TVec2(A x, B y) noexcept : v{ T(x), T(y) } {}
|
|
|
|
template<typename A, typename = enable_if_arithmetic_t<A>>
|
|
constexpr TVec2(const TVec2<A>& v) noexcept : v{ T(v[0]), T(v[1]) } {}
|
|
|
|
// cross product works only on vectors of size 2 or 3
|
|
template<typename U>
|
|
friend inline constexpr
|
|
arithmetic_result_t<T, U> cross(const TVec2& u, const TVec2<U>& v) noexcept {
|
|
return u[0] * v[1] - u[1] * v[0];
|
|
}
|
|
};
|
|
|
|
} // namespace details
|
|
|
|
// ----------------------------------------------------------------------------------------
|
|
|
|
template<typename T, typename = details::enable_if_arithmetic_t<T>>
|
|
using vec2 = details::TVec2<T>;
|
|
|
|
using double2 = vec2<double>;
|
|
using float2 = vec2<float>;
|
|
using half2 = vec2<half>;
|
|
using int2 = vec2<int32_t>;
|
|
using uint2 = vec2<uint32_t>;
|
|
using short2 = vec2<int16_t>;
|
|
using ushort2 = vec2<uint16_t>;
|
|
using byte2 = vec2<int8_t>;
|
|
using ubyte2 = vec2<uint8_t>;
|
|
using bool2 = vec2<bool>;
|
|
|
|
// ----------------------------------------------------------------------------------------
|
|
} // namespace math
|
|
} // namespace filament
|
|
|
|
#endif // MATH_VEC2_H_
|