e955c94ed3
Listing the "Blender Foundation" as copyright holder implied the Blender Foundation holds copyright to files which may include work from many developers. While keeping copyright on headers makes sense for isolated libraries, Blender's own code may be refactored or moved between files in a way that makes the per file copyright holders less meaningful. Copyright references to the "Blender Foundation" have been replaced with "Blender Authors", with the exception of `./extern/` since these this contains libraries which are more isolated, any changed to license headers there can be handled on a case-by-case basis. Some directories in `./intern/` have also been excluded: - `./intern/cycles/` it's own `AUTHORS` file is planned. - `./intern/opensubdiv/`. An "AUTHORS" file has been added, using the chromium projects authors file as a template. Design task: #110784 Ref !110783.
120 lines
3.6 KiB
C++
120 lines
3.6 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup bli
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*/
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#include "BLI_hash.hh"
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#include "BLI_math_vector.hh"
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#include "BLI_math_vector_mpq_types.hh"
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#include "BLI_span.hh"
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#include "BLI_utildefines.h"
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namespace blender::math {
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template<>
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isect_result<float2> isect_seg_seg(const float2 &v1,
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const float2 &v2,
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const float2 &v3,
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const float2 &v4)
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{
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isect_result<float2> ans;
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float div = (v2[0] - v1[0]) * (v4[1] - v3[1]) - (v2[1] - v1[1]) * (v4[0] - v3[0]);
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if (div == 0.0f) {
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ans.lambda = 0.0f;
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ans.kind = isect_result<float2>::LINE_LINE_COLINEAR;
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}
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else {
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ans.lambda = ((v1[1] - v3[1]) * (v4[0] - v3[0]) - (v1[0] - v3[0]) * (v4[1] - v3[1])) / div;
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float mu = ((v1[1] - v3[1]) * (v2[0] - v1[0]) - (v1[0] - v3[0]) * (v2[1] - v1[1])) / div;
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if (ans.lambda >= 0.0f && ans.lambda <= 1.0f && mu >= 0.0f && mu <= 1.0f) {
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if (ans.lambda == 0.0f || ans.lambda == 1.0f || mu == 0.0f || mu == 1.0f) {
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ans.kind = isect_result<float2>::LINE_LINE_EXACT;
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}
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else {
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ans.kind = isect_result<float2>::LINE_LINE_CROSS;
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}
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}
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else {
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ans.kind = isect_result<float2>::LINE_LINE_NONE;
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}
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}
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return ans;
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}
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template<>
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isect_result<double2> isect_seg_seg(const double2 &v1,
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const double2 &v2,
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const double2 &v3,
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const double2 &v4)
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{
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isect_result<double2> ans;
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double div = (v2[0] - v1[0]) * (v4[1] - v3[1]) - (v2[1] - v1[1]) * (v4[0] - v3[0]);
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if (div == 0.0) {
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ans.lambda = 0.0;
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ans.kind = isect_result<double2>::LINE_LINE_COLINEAR;
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}
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else {
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ans.lambda = ((v1[1] - v3[1]) * (v4[0] - v3[0]) - (v1[0] - v3[0]) * (v4[1] - v3[1])) / div;
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double mu = ((v1[1] - v3[1]) * (v2[0] - v1[0]) - (v1[0] - v3[0]) * (v2[1] - v1[1])) / div;
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if (ans.lambda >= 0.0 && ans.lambda <= 1.0 && mu >= 0.0 && mu <= 1.0) {
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if (ans.lambda == 0.0 || ans.lambda == 1.0 || mu == 0.0 || mu == 1.0) {
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ans.kind = isect_result<double2>::LINE_LINE_EXACT;
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}
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else {
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ans.kind = isect_result<double2>::LINE_LINE_CROSS;
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}
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}
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else {
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ans.kind = isect_result<double2>::LINE_LINE_NONE;
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}
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}
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return ans;
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}
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#ifdef WITH_GMP
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template<>
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isect_result<mpq2> isect_seg_seg(const mpq2 &v1, const mpq2 &v2, const mpq2 &v3, const mpq2 &v4)
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{
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isect_result<mpq2> ans;
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mpq_class div = (v2[0] - v1[0]) * (v4[1] - v3[1]) - (v2[1] - v1[1]) * (v4[0] - v3[0]);
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if (div == 0.0) {
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ans.lambda = 0.0;
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ans.kind = isect_result<mpq2>::LINE_LINE_COLINEAR;
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}
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else {
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ans.lambda = ((v1[1] - v3[1]) * (v4[0] - v3[0]) - (v1[0] - v3[0]) * (v4[1] - v3[1])) / div;
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/* Avoid dividing mu by div: it is expensive in multi-precision. */
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mpq_class mudiv = ((v1[1] - v3[1]) * (v2[0] - v1[0]) - (v1[0] - v3[0]) * (v2[1] - v1[1]));
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if (ans.lambda >= 0 && ans.lambda <= 1 &&
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((div > 0 && mudiv >= 0 && mudiv <= div) || (div < 0 && mudiv <= 0 && mudiv >= div)))
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{
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if (ans.lambda == 0 || ans.lambda == 1 || mudiv == 0 || mudiv == div) {
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ans.kind = isect_result<mpq2>::LINE_LINE_EXACT;
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}
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else {
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ans.kind = isect_result<mpq2>::LINE_LINE_CROSS;
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}
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}
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else {
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ans.kind = isect_result<mpq2>::LINE_LINE_NONE;
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}
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}
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return ans;
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}
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#endif
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#ifdef WITH_GMP
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uint64_t hash_mpq_class(const mpq_class &value)
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{
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/* TODO: better/faster implementation of this. */
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return get_default_hash(float(value.get_d()));
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}
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#endif
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} // namespace blender::math
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