c1bc70b711
A lot of files were missing copyright field in the header and
the Blender Foundation contributed to them in a sense of bug
fixing and general maintenance.
This change makes it explicit that those files are at least
partially copyrighted by the Blender Foundation.
Note that this does not make it so the Blender Foundation is
the only holder of the copyright in those files, and developers
who do not have a signed contract with the foundation still
hold the copyright as well.
Another aspect of this change is using SPDX format for the
header. We already used it for the license specification,
and now we state it for the copyright as well, following the
FAQ:
https://reuse.software/faq/
120 lines
3.6 KiB
C++
120 lines
3.6 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Foundation
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
|
|
/** \file
|
|
* \ingroup bli
|
|
*/
|
|
|
|
#include "BLI_hash.hh"
|
|
#include "BLI_math_vector.hh"
|
|
#include "BLI_math_vector_mpq_types.hh"
|
|
#include "BLI_span.hh"
|
|
#include "BLI_utildefines.h"
|
|
|
|
namespace blender::math {
|
|
|
|
template<>
|
|
isect_result<float2> isect_seg_seg(const float2 &v1,
|
|
const float2 &v2,
|
|
const float2 &v3,
|
|
const float2 &v4)
|
|
{
|
|
isect_result<float2> ans;
|
|
float div = (v2[0] - v1[0]) * (v4[1] - v3[1]) - (v2[1] - v1[1]) * (v4[0] - v3[0]);
|
|
if (div == 0.0f) {
|
|
ans.lambda = 0.0f;
|
|
ans.kind = isect_result<float2>::LINE_LINE_COLINEAR;
|
|
}
|
|
else {
|
|
ans.lambda = ((v1[1] - v3[1]) * (v4[0] - v3[0]) - (v1[0] - v3[0]) * (v4[1] - v3[1])) / div;
|
|
float mu = ((v1[1] - v3[1]) * (v2[0] - v1[0]) - (v1[0] - v3[0]) * (v2[1] - v1[1])) / div;
|
|
if (ans.lambda >= 0.0f && ans.lambda <= 1.0f && mu >= 0.0f && mu <= 1.0f) {
|
|
if (ans.lambda == 0.0f || ans.lambda == 1.0f || mu == 0.0f || mu == 1.0f) {
|
|
ans.kind = isect_result<float2>::LINE_LINE_EXACT;
|
|
}
|
|
else {
|
|
ans.kind = isect_result<float2>::LINE_LINE_CROSS;
|
|
}
|
|
}
|
|
else {
|
|
ans.kind = isect_result<float2>::LINE_LINE_NONE;
|
|
}
|
|
}
|
|
return ans;
|
|
}
|
|
|
|
template<>
|
|
isect_result<double2> isect_seg_seg(const double2 &v1,
|
|
const double2 &v2,
|
|
const double2 &v3,
|
|
const double2 &v4)
|
|
{
|
|
isect_result<double2> ans;
|
|
double div = (v2[0] - v1[0]) * (v4[1] - v3[1]) - (v2[1] - v1[1]) * (v4[0] - v3[0]);
|
|
if (div == 0.0) {
|
|
ans.lambda = 0.0;
|
|
ans.kind = isect_result<double2>::LINE_LINE_COLINEAR;
|
|
}
|
|
else {
|
|
ans.lambda = ((v1[1] - v3[1]) * (v4[0] - v3[0]) - (v1[0] - v3[0]) * (v4[1] - v3[1])) / div;
|
|
double mu = ((v1[1] - v3[1]) * (v2[0] - v1[0]) - (v1[0] - v3[0]) * (v2[1] - v1[1])) / div;
|
|
if (ans.lambda >= 0.0 && ans.lambda <= 1.0 && mu >= 0.0 && mu <= 1.0) {
|
|
if (ans.lambda == 0.0 || ans.lambda == 1.0 || mu == 0.0 || mu == 1.0) {
|
|
ans.kind = isect_result<double2>::LINE_LINE_EXACT;
|
|
}
|
|
else {
|
|
ans.kind = isect_result<double2>::LINE_LINE_CROSS;
|
|
}
|
|
}
|
|
else {
|
|
ans.kind = isect_result<double2>::LINE_LINE_NONE;
|
|
}
|
|
}
|
|
return ans;
|
|
}
|
|
|
|
#ifdef WITH_GMP
|
|
template<>
|
|
isect_result<mpq2> isect_seg_seg(const mpq2 &v1, const mpq2 &v2, const mpq2 &v3, const mpq2 &v4)
|
|
{
|
|
isect_result<mpq2> ans;
|
|
mpq_class div = (v2[0] - v1[0]) * (v4[1] - v3[1]) - (v2[1] - v1[1]) * (v4[0] - v3[0]);
|
|
if (div == 0.0) {
|
|
ans.lambda = 0.0;
|
|
ans.kind = isect_result<mpq2>::LINE_LINE_COLINEAR;
|
|
}
|
|
else {
|
|
ans.lambda = ((v1[1] - v3[1]) * (v4[0] - v3[0]) - (v1[0] - v3[0]) * (v4[1] - v3[1])) / div;
|
|
/* Avoid dividing mu by div: it is expensive in multi-precision. */
|
|
mpq_class mudiv = ((v1[1] - v3[1]) * (v2[0] - v1[0]) - (v1[0] - v3[0]) * (v2[1] - v1[1]));
|
|
if (ans.lambda >= 0 && ans.lambda <= 1 &&
|
|
((div > 0 && mudiv >= 0 && mudiv <= div) || (div < 0 && mudiv <= 0 && mudiv >= div)))
|
|
{
|
|
if (ans.lambda == 0 || ans.lambda == 1 || mudiv == 0 || mudiv == div) {
|
|
ans.kind = isect_result<mpq2>::LINE_LINE_EXACT;
|
|
}
|
|
else {
|
|
ans.kind = isect_result<mpq2>::LINE_LINE_CROSS;
|
|
}
|
|
}
|
|
else {
|
|
ans.kind = isect_result<mpq2>::LINE_LINE_NONE;
|
|
}
|
|
}
|
|
return ans;
|
|
}
|
|
#endif
|
|
|
|
#ifdef WITH_GMP
|
|
|
|
uint64_t hash_mpq_class(const mpq_class &value)
|
|
{
|
|
/* TODO: better/faster implementation of this. */
|
|
return get_default_hash(float(value.get_d()));
|
|
}
|
|
|
|
#endif
|
|
|
|
} // namespace blender::math
|