libcruft-util/matrix.hpp

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/*
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* 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
*
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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
* 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.
*
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* Copyright 2011-2015 Danny Robson <danny@nerdcruft.net>
*/
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#ifndef __UTIL_MATRIX_HPP
#define __UTIL_MATRIX_HPP
#include "point.hpp"
#include "range.hpp"
#include "vector.hpp"
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#include "iterator.hpp"
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#include <cstdlib>
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#include <ostream>
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namespace util {
template <
std::size_t Rows,
std::size_t Cols,
typename T
>
struct matrix {
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static constexpr auto rows = Rows;
static constexpr auto cols = Cols;
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using row_t = util::vector<Cols,T>;
///////////////////////////////////////////////////////////////////////
constexpr matrix () noexcept = default;
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//---------------------------------------------------------------------
constexpr matrix (const T(&_data)[Rows][Cols]) noexcept:
values {}
{
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static_assert (sizeof (*this) == sizeof (T) * Rows * Cols);
for (std::size_t r = 0; r < Rows; ++r)
for (std::size_t c = 0; c < Cols; ++c)
values[r][c] = _data[r][c];
}
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//---------------------------------------------------------------------
template <std::size_t S, typename SelfT>
constexpr matrix (const util::coord::base<S,T,SelfT> (&_data)[Rows]) noexcept
{
for (std::size_t r = 0; r < Rows; ++r)
for (std::size_t c = 0; c < Cols; ++c)
values[r][c] = _data[r][c];
}
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///////////////////////////////////////////////////////////////////////
// index operators return a pointer into the data array so that
// multidimensional array syntax can be used transparently on this
// type.
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constexpr row_t& operator[] (std::size_t idx)& { return values[idx]; }
constexpr const row_t& operator[] (std::size_t idx) const& { return values[idx]; }
//---------------------------------------------------------------------
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constexpr row_t*
data (void)& noexcept
{
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return &values[0];
}
//---------------------------------------------------------------------
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constexpr const row_t*
data (void) const& noexcept
{
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return &values[0];
}
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//---------------------------------------------------------------------
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constexpr auto
begin (void) const& noexcept
{
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return data ();
}
//---------------------------------------------------------------------
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constexpr auto
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begin (void)& noexcept
{
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return data ();
}
//---------------------------------------------------------------------
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constexpr row_t*
end (void)& noexcept
{
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return &values[Rows];
}
//---------------------------------------------------------------------
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constexpr const row_t*
end (void) const& noexcept
{
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return &values[Rows];
}
//---------------------------------------------------------------------
constexpr auto
cbegin (void) const& noexcept
{
return begin ();
}
//---------------------------------------------------------------------
constexpr auto
cend (void) const& noexcept
{
return end ();
}
///////////////////////////////////////////////////////////////////////
T determinant (void) const;
matrix inverse (void) const;
matrix
inverse_affine (void) const
{
// TODO: ensure we have specialisations for typical dimensions
return inverse ();
}
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template <typename VectorT>
std::enable_if_t<is_coord_v<VectorT>, VectorT>
operator* (const VectorT &rhs) const
{
VectorT out;
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for (std::size_t r = 0; r < Rows; ++r)
out[r] = dot (rhs, values[r]);
return out;
}
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bool is_affine (void) const;
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template <typename U>
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matrix<Rows,Cols,U>
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cast (void) const noexcept
{
matrix out;
std::copy (cbegin (), cend (), std::begin (out));
return out;
}
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// Constant matrices
static constexpr
matrix identity (void) noexcept
{
auto m = zeroes ();
for (std::size_t i = 0; i < Rows; ++i)
m[i][i] = 1;
return m;
}
static constexpr
matrix zeroes (void) noexcept
{
matrix ret {};
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std::fill (std::begin (ret), std::end (ret), row_t{0});
return ret;
}
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private:
row_t values[Rows];
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};
// Perspective matrices
template <typename T> matrix<4,4,T> ortho (T left, T right, T bottom, T top, T near, T far);
template <typename T> matrix<4,4,T> ortho2D (T left, T right, T bottom, T top);
template <typename T> matrix<4,4,T> perspective (T fov, T aspect, range<T> Z);
template <typename T> matrix<4,4,T> look_at (point<3,T> eye, point<3,T> target, vector<3,T> up);
// Affine matrices
template <typename T> matrix<4,4,T> translation (vector<3,T>);
template <typename T> matrix<4,4,T> scale (vector<3,T>);
template <typename T> matrix<4,4,T> scale (T);
template <typename T> matrix<4,4,T> rotation (T angle, vector<3,T> about);
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///////////////////////////////////////////////////////////////////////////
// Convert an affine rotation matrix to euler angles.
//
// Results are undefined if the matrix is not purely a rotation matrix,
// or if the dimension is not 3x3 or 4x4.
template <std::size_t Rows, std::size_t Cols, typename T>
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vector<3,T>
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to_euler (const matrix<Rows, Cols, T>&);
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///////////////////////////////////////////////////////////////////////////
// logical operations
template <std::size_t Rows, std::size_t Cols, typename T>
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constexpr
bool
operator== (const matrix<Rows,Cols,T> &a, const matrix<Rows,Cols,T> &b)
{
return std::equal (std::cbegin (a), std::cend (a), std::cbegin (b));
}
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//-------------------------------------------------------------------------
template <std::size_t Rows, std::size_t Cols, typename T>
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constexpr
bool
operator!= (const matrix<Rows,Cols,T> &a, const matrix<Rows,Cols,T> &b)
{
return !(a == b);
}
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///////////////////////////////////////////////////////////////////////////
// element operations
template <std::size_t Rows, std::size_t Cols, typename T>
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constexpr
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matrix<Rows,Cols,T>
operator+ (const matrix<Rows,Cols,T>&, const matrix<Rows,Cols,T>&);
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template <std::size_t Rows, std::size_t Cols, typename T>
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constexpr
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matrix<Rows,Cols,T>
operator- (const matrix<Rows,Cols,T>&, const matrix<Rows,Cols,T>&);
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template <std::size_t Rows, std::size_t Cols, typename T>
constexpr
matrix<Rows,Cols,T>
div (const matrix<Rows,Cols,T> &a, const matrix<Rows,Cols,T> &b)
{
matrix<Rows,Cols,T> out {};
for (std::size_t r = 0; r < Rows; ++r)
for (std::size_t c = 0; c < Cols; ++c)
out[r][c] = a[r][c] / b[r][c];
return out;
}
template <std::size_t Rows, std::size_t Cols, typename T>
constexpr T
max (const matrix<Rows,Cols,T> &m)
{
T val = m[0][0];
for (std::size_t r = 0; r < Rows; ++r)
for (std::size_t c = 0; c < Cols; ++c)
val = max (val, m[r][c]);
return val;
}
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///////////////////////////////////////////////////////////////////////////
// scalar operations
template <std::size_t R, std::size_t C, typename T> constexpr matrix<R,C,T> operator* (const matrix<R,C,T>&, T);
template <std::size_t R, std::size_t C, typename T> constexpr matrix<R,C,T> operator/ (const matrix<R,C,T>&, T);
template <std::size_t R, std::size_t C, typename T> constexpr matrix<R,C,T> operator+ (const matrix<R,C,T>&, T);
template <std::size_t R, std::size_t C, typename T> constexpr matrix<R,C,T> operator- (const matrix<R,C,T>&, T);
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template <std::size_t R, std::size_t C, typename T> constexpr matrix<R,C,T> operator* (T, const matrix<R,C,T>&);
template <std::size_t R, std::size_t C, typename T> constexpr matrix<R,C,T> operator/ (T, const matrix<R,C,T>&);
template <std::size_t R, std::size_t C, typename T> constexpr matrix<R,C,T> operator+ (T, const matrix<R,C,T>&);
template <std::size_t R, std::size_t C, typename T> constexpr matrix<R,C,T> operator- (T, const matrix<R,C,T>&);
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template <std::size_t R, std::size_t C, typename T> constexpr matrix<R,C,T>& operator*= (matrix<R,C,T>&, T);
template <std::size_t R, std::size_t C, typename T> constexpr matrix<R,C,T>& operator/= (matrix<R,C,T>&, T);
template <std::size_t R, std::size_t C, typename T> constexpr matrix<R,C,T>& operator+= (matrix<R,C,T>&, T);
template <std::size_t R, std::size_t C, typename T> constexpr matrix<R,C,T>& operator-= (matrix<R,C,T>&, T);
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///////////////////////////////////////////////////////////////////////////
// matrix operations
template <
std::size_t R1, //int C1,
std::size_t RC, //int R2,
std::size_t C2,
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typename T
>
constexpr
matrix<R1,C2,T>
operator* (const matrix<R1,RC,T>&a, const matrix<RC,C2,T>&b)
{
matrix<R1,C2,T> res {};
// TODO: iterating over r,c rather than c,r will cause an ICE with
// clang#xxxx: 'X86 DAG->DAG Instruction Selection'.
//
// this is likely related to gold and LTO support. for the time being
// we switch the orders because it appears to confuse the optimiser
// sufficiently. :(
for (std::size_t c = 0; c < C2; ++c) {
for (std::size_t r = 0; r < R1; ++r) {
T accum {0};
for (std::size_t i = 0; i < RC; ++i)
accum += a[r][i] * b[i][c];
res[r][c] = accum;
}
}
return res;
}
//-------------------------------------------------------------------------
template <
std::size_t R1, std::size_t C1,
std::size_t R2, std::size_t C2,
typename T
>
constexpr
matrix<R1,C2,T>&
operator*= (matrix<R1,C1,T> &a, const matrix<R2,C2,T> &b)
{ return a = a * b; };
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///////////////////////////////////////////////////////////////////////////
template <std::size_t Rows, std::size_t Cols, typename T>
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T
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determinant (const matrix<Rows,Cols,T>&);
//-------------------------------------------------------------------------
template <std::size_t Rows, std::size_t Cols, typename T>
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matrix<Rows,Cols,T>
inverse (const matrix<Rows,Cols,T>&);
//-------------------------------------------------------------------------
template <std::size_t Rows, std::size_t Cols, typename T>
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matrix<Cols,Rows,T>
transposed (const matrix<Rows,Cols,T>&);
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///////////////////////////////////////////////////////////////////////////
template <std::size_t Rows, std::size_t Cols, typename T>
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matrix<Rows,Cols,T>
abs (const matrix<Rows,Cols,T> &src)
{
matrix<Rows,Cols,T> dst;
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for (size_t r = 0; r < Rows; ++r)
dst[r] = abs (src[r]);
return dst;
}
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template <std::size_t Rows, std::size_t Cols, typename T>
constexpr T
sum (const matrix<Rows,Cols,T> &src)
{
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util::vector<Rows,T> accum {};
for (size_t r = 0; r < Rows; ++r)
accum[r] = sum (src[r]);
return sum (accum);
}
///////////////////////////////////////////////////////////////////////////
#define MATRIX_ELEMENT_OP(OP) \
template <std::size_t Rows, std::size_t Cols, typename T> \
constexpr \
matrix<Rows,Cols,T> \
operator OP ( \
const matrix<Rows,Cols,T> &a, \
const matrix<Rows,Cols,T> &b) \
{ \
matrix<Rows,Cols,T> res {}; \
\
for (std::size_t i = 0; i < a.rows; ++i) \
for (std::size_t j = 0; j < a.cols; ++j) \
res[i][j] = a[i][j] OP b[i][j]; \
\
return res; \
}
MATRIX_ELEMENT_OP(-)
MATRIX_ELEMENT_OP(+)
#undef MATRIX_ELEMENT_OP
///////////////////////////////////////////////////////////////////////////
#define MATRIX_SCALAR_OP(OP) \
template <std::size_t Rows, std::size_t Cols, typename T> \
constexpr \
matrix<Rows,Cols,T> \
operator OP (const matrix<Rows,Cols,T> &m, const T t) \
{ \
matrix<Rows,Cols,T> res {}; \
\
std::transform ( \
std::cbegin (m), \
std::cend (m), \
std::begin (res), \
[&t] (auto x) { return x OP t; } \
); \
\
return res; \
} \
\
\
template <std::size_t Rows, std::size_t Cols, typename T> \
constexpr \
matrix<Rows,Cols,T> \
operator OP (const T t, const matrix<Rows,Cols,T> &m) \
{ \
return m OP t; \
} \
\
\
template <std::size_t Rows, std::size_t Cols, typename T> \
constexpr \
matrix<Rows,Cols,T>& \
operator OP##= (matrix<Rows,Cols,T> &m, T t) \
{ \
std::transform ( \
std::cbegin (m), \
std::cend (m), \
std::begin (m), \
[&t] (auto x) { return x OP t; } \
); \
\
return m; \
}
MATRIX_SCALAR_OP(*)
MATRIX_SCALAR_OP(/)
MATRIX_SCALAR_OP(+)
MATRIX_SCALAR_OP(-)
#undef MATRIX_SCALAR_OP
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///////////////////////////////////////////////////////////////////////////
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template <typename T> using matrix3 = matrix<3,3,T>;
template <typename T> using matrix4 = matrix<4,4,T>;
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template <std::size_t Rows, std::size_t Cols> using matrixf = matrix<Rows,Cols,float>;
template <std::size_t Rows, std::size_t Cols> using matrixd = matrix<Rows,Cols,double>;
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typedef matrix<2,2,float> matrix2f;
typedef matrix<2,2,double> matrix2d;
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typedef matrix<3,3,float> matrix3f;
typedef matrix<3,3,double> matrix3d;
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typedef matrix<4,4,float> matrix4f;
typedef matrix<4,4,double> matrix4d;
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///////////////////////////////////////////////////////////////////////////
template <std::size_t Rows, std::size_t Cols, typename T>
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std::ostream&
operator<< (std::ostream &os, const matrix<Rows,Cols,T> &m)
{
os << '[';
std::copy (
std::cbegin (m),
std::cend (m),
util::infix_iterator<decltype(m[0])> (os, ", ")
);
return os << ']';
}
};
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#endif