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Diffstat (limited to 'intern/opensubdiv/internal/opensubdiv_converter_orient_impl.h')
-rw-r--r-- | intern/opensubdiv/internal/opensubdiv_converter_orient_impl.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/intern/opensubdiv/internal/opensubdiv_converter_orient_impl.h b/intern/opensubdiv/internal/opensubdiv_converter_orient_impl.h new file mode 100644 index 00000000000..3125bc600e5 --- /dev/null +++ b/intern/opensubdiv/internal/opensubdiv_converter_orient_impl.h @@ -0,0 +1,66 @@ +// Copyright 2018 Blender Foundation. All rights reserved. +// +// This program is free software; you can redistribute it and/or +// modify it under the terms of the GNU General Public License +// as published by the Free Software Foundation; either version 2 +// of the License, or (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software Foundation, +// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. +// +// Author: Sergey Sharybin + +#ifndef OPENSUBDIV_CONVERTER_ORIENT_IMPL_H_ +#define OPENSUBDIV_CONVERTER_ORIENT_IMPL_H_ + +#include "internal/opensubdiv_converter_orient.h" + +#include <algorithm> +#include <cmath> +#include <utility> + +namespace opensubdiv_capi { + +inline void reverseFaceVertices(int* face_vertices, const int num_vertices) { + int last_vert = face_vertices[num_vertices - 1]; + for (int i = num_vertices - 1; i > 0; --i) { + face_vertices[i] = face_vertices[i - 1]; + } + face_vertices[0] = last_vert; +} + +inline int getLoopWinding(int vert0_of_face, int vert1_of_face) { + int delta_face = vert1_of_face - vert0_of_face; + if (abs(delta_face) != 1) { + if (delta_face > 0) { + delta_face = -1; + } else { + delta_face = 1; + } + } + return delta_face; +} + +inline void reverseFaceLoops( + OpenSubdiv::Far::IndexArray* face_vertices, + OpenSubdiv::Far::IndexArray* face_edges) { + const int num_face_vertices = face_vertices->size(); + for (int i = 0; i < num_face_vertices / 2; ++i) { + const int j = num_face_vertices - i - 1; + if (i != j) { + std::swap((*face_vertices)[i], (*face_vertices)[j]); + std::swap((*face_edges)[i], (*face_edges)[j]); + } + } + reverseFaceVertices(&(*face_vertices)[0], num_face_vertices); +} + +} // namespace opensubdiv_capi + +#endif // OPENSUBDIV_CONVERTER_ORIENT_IMPL_H_ |