595ea77f6b
- this implements vec2, vec3, vec4, which are float vectors
of size 2, 3 and 4 respectively.
the code allows easy instantiation of vectors of a different
type via the tvec{2|3|4}<T> template classes.
- this also implements mat4 which is a float 4x4 matrix. the
tmat44<T> template class allows easy instantiation of a
4x4 matrix of a different value_type.
The vector types have some minimal support for the
glsl style swizzled access; for instance:
vec4 u;
vec3 v = u.xyz;
only .x, .xy, .xyz and their .stpq / .rgba equivalent are
supported.
most operators are supported on both vector and matrices:
arithmetic, unary, compound assignment and comparison
(bit-wise operators NOT supported).
- operations available on vectors include:
dot, length, distance, normalize and cross
- operations available on matrices include:
transpose, inverse, trace
- and a few utilities to create matrices:
ortho, frustum, lookAt
Change-Id: I64add89ae90fa78d3f2f59985b63495575378635
111 lines
3.4 KiB
C++
111 lines
3.4 KiB
C++
/*
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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_VEC4_H
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#define UI_VEC4_H
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#include <stdint.h>
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#include <sys/types.h>
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#include <ui/vec3.h>
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namespace android {
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// -------------------------------------------------------------------------------------
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template <typename T>
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class tvec4 : public TVecArithmeticOperators<tvec4, T>,
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public TVecUnaryOperators<tvec4, T>,
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public TVecComparisonOperators<tvec4, T>,
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public TVecFunctions<tvec4, 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, w; };
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struct { T s, t, p, q; };
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struct { T r, g, b, a; };
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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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Impersonator< tvec3<T> > xyz;
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Impersonator< tvec3<T> > stp;
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Impersonator< tvec3<T> > rgb;
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};
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enum { SIZE = 4 };
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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 tvec4(no_init) { }
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// default constructor
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tvec4() : x(0), y(0), z(0), w(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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tvec4(A v) : x(v), y(v), z(v), w(v) { }
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template<typename A, typename B, typename C, typename D>
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tvec4(A x, B y, C z, D w) : x(x), y(y), z(z), w(w) { }
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template<typename A, typename B, typename C>
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tvec4(const tvec2<A>& v, B z, C w) : x(v.x), y(v.y), z(z), w(w) { }
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template<typename A, typename B>
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tvec4(const tvec3<A>& v, B w) : x(v.x), y(v.y), z(v.z), w(w) { }
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template<typename A>
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explicit tvec4(const tvec4<A>& v) : x(v.x), y(v.y), z(v.z), w(v.w) { }
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template<typename A, typename B>
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tvec4(const Impersonator< tvec3<A> >& v, B w)
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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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w(w) { }
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template<typename A, typename B, typename C>
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tvec4(const Impersonator< tvec2<A> >& v, B z, C w)
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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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w(w) { }
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};
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// ----------------------------------------------------------------------------------------
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typedef tvec4<float> vec4;
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// ----------------------------------------------------------------------------------------
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}; // namespace android
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#endif /* UI_VEC4_H */
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