add macOS implementation

macos/include/math/vec4.h

@@ -0,0 +1,133 @@
+/*
+ * 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 TNT_MATH_VEC4_H
+#define TNT_MATH_VEC4_H
+
+#include <math/half.h>
+#include <math/vec3.h>
+
+#include <stdint.h>
+#include <sys/types.h>
+
+
+namespace filament {
+namespace math {
+// -------------------------------------------------------------------------------------
+
+namespace details {
+
+template<typename T>
+class MATH_EMPTY_BASES TVec4 :
+        public TVecProductOperators<TVec4, T>,
+        public TVecAddOperators<TVec4, T>,
+        public TVecUnaryOperators<TVec4, T>,
+        public TVecComparisonOperators<TVec4, T>,
+        public TVecFunctions<TVec4, T> {
+public:
+    typedef T value_type;
+    typedef T& reference;
+    typedef T const& const_reference;
+    typedef size_t size_type;
+    static constexpr size_t SIZE = 4;
+
+    union {
+        T v[SIZE] MATH_CONSTEXPR_INIT;
+        TVec2<T> xy, st, rg;
+        TVec3<T> xyz, stp, rgb;
+        struct {
+            union { T x, s, r; };
+            union {
+                TVec2<T> yz, tp, gb;
+                TVec3<T> yzw, tpq, gba;
+                struct {
+                    union { T y, t, g; };
+                    union {
+                        TVec2<T> zw, pq, ba;
+                        struct { T z, w; };
+                        struct { T p, q; };
+                        struct { T b, a; };
+                    };
+                };
+            };
+        };
+    };
+
+    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 TVec4() noexcept MATH_DEFAULT_CTOR
+
+    // handles implicit conversion to a tvec4. must not be explicit.
+    template<typename A, typename = enable_if_arithmetic_t<A>>
+    constexpr TVec4(A v) noexcept : v{ T(v), T(v), T(v), T(v) } {}
+
+    template<typename A, typename B, typename C, typename D,
+            typename = enable_if_arithmetic_t<A, B, C, D>>
+    constexpr TVec4(A x, B y, C z, D w) noexcept : v{ T(x), T(y), T(z), T(w) } {}
+
+    template<typename A, typename B, typename C,
+            typename = enable_if_arithmetic_t<A, B, C>>
+    constexpr TVec4(const TVec2<A>& v, B z, C w) noexcept : v{ T(v[0]), T(v[1]), T(z), T(w) } {}
+
+    template<typename A, typename B, typename = enable_if_arithmetic_t<A, B>>
+    constexpr TVec4(const TVec2<A>& v, const TVec2<B>& w) noexcept : v{
+            T(v[0]), T(v[1]), T(w[0]), T(w[1]) } {}
+
+    template<typename A, typename B, typename = enable_if_arithmetic_t<A, B>>
+    constexpr TVec4(const TVec3<A>& v, B w) noexcept : v{ T(v[0]), T(v[1]), T(v[2]), T(w) } {}
+
+    template<typename A, typename = enable_if_arithmetic_t<A>>
+    constexpr TVec4(const TVec4<A>& v) noexcept : v{ T(v[0]), T(v[1]), T(v[2]), T(v[3]) } {}
+};
+
+}  // namespace details
+
+// ----------------------------------------------------------------------------------------
+
+template<typename T, typename = details::enable_if_arithmetic_t<T>>
+using vec4 = details::TVec4<T>;
+
+using double4 = vec4<double>;
+using float4 = vec4<float>;
+using half4 = vec4<half>;
+using int4 = vec4<int32_t>;
+using uint4 = vec4<uint32_t>;
+using short4 = vec4<int16_t>;
+using ushort4 = vec4<uint16_t>;
+using byte4 = vec4<int8_t>;
+using ubyte4 = vec4<uint8_t>;
+using bool4 = vec4<bool>;
+
+
+// ----------------------------------------------------------------------------------------
+}  // namespace math
+}  // namespace filament
+
+#endif  // TNT_MATH_VEC4_H