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113 lines
3.4 KiB
113 lines
3.4 KiB
/*
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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 UI_VEC3_H
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#define UI_VEC3_H
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#include <stdint.h>
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#include <sys/types.h>
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#include <ui/vec2.h>
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namespace android {
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// -------------------------------------------------------------------------------------
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template <typename T>
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class tvec3 : 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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{
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public:
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enum no_init { NO_INIT };
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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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union {
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struct { T x, y, z; };
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struct { T s, t, p; };
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struct { T r, g, b; };
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Impersonator< tvec2<T> > xy;
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Impersonator< tvec2<T> > st;
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Impersonator< tvec2<T> > rg;
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};
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enum { SIZE = 3 };
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inline static size_type size() { return SIZE; }
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// array access
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inline T const& operator [] (size_t i) const { return (&x)[i]; }
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inline T& operator [] (size_t i) { return (&x)[i]; }
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// -----------------------------------------------------------------------
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// we don't provide copy-ctor and operator= on purpose
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// because we want the compiler generated versions
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// constructors
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// leaves object uninitialized. use with caution.
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explicit tvec3(no_init) { }
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// default constructor
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tvec3() : x(0), y(0), z(0) { }
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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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tvec3(A v) : x(v), y(v), z(v) { }
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template<typename A, typename B, typename C>
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tvec3(A x, B y, C z) : x(x), y(y), z(z) { }
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template<typename A, typename B>
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tvec3(const tvec2<A>& v, B z) : x(v.x), y(v.y), z(z) { }
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template<typename A>
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explicit tvec3(const tvec3<A>& v) : x(v.x), y(v.y), z(v.z) { }
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template<typename A>
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tvec3(const Impersonator< tvec3<A> >& v)
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: x(((const tvec3<A>&)v).x),
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y(((const tvec3<A>&)v).y),
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z(((const tvec3<A>&)v).z) { }
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template<typename A, typename B>
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tvec3(const Impersonator< tvec2<A> >& v, B z)
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: x(((const tvec2<A>&)v).x),
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y(((const tvec2<A>&)v).y),
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z(z) { }
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// cross product works only on vectors of size 3
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template <typename RT>
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friend inline
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tvec3 __attribute__((pure)) cross(const tvec3& u, const tvec3<RT>& v) {
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return tvec3(
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u.y*v.z - u.z*v.y,
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u.z*v.x - u.x*v.z,
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u.x*v.y - u.y*v.x);
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}
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};
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// ----------------------------------------------------------------------------------------
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typedef tvec3<float> vec3;
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// ----------------------------------------------------------------------------------------
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}; // namespace android
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#endif /* UI_VEC4_H */
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