65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
// Copyright 2024 The Manifold Authors.
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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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#pragma once
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#include "./shared.h"
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namespace {
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using namespace manifold;
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inline int FlipHalfedge(int halfedge) {
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const int tri = halfedge / 3;
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const int vert = 2 - (halfedge - 3 * tri);
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return 3 * tri + vert;
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}
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struct TransformNormals {
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mat3 transform;
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vec3 operator()(vec3 normal) const {
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normal = la::normalize(transform * normal);
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if (std::isnan(normal.x)) normal = vec3(0.0);
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return normal;
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}
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};
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struct TransformTangents {
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VecView<vec4> tangent;
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const int edgeOffset;
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const mat3 transform;
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const bool invert;
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VecView<const vec4> oldTangents;
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VecView<const Halfedge> halfedge;
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void operator()(const int edgeOut) {
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const int edgeIn =
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invert ? halfedge[FlipHalfedge(edgeOut)].pairedHalfedge : edgeOut;
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tangent[edgeOut + edgeOffset] =
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vec4(transform * vec3(oldTangents[edgeIn]), oldTangents[edgeIn].w);
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}
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};
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struct FlipTris {
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VecView<Halfedge> halfedge;
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void operator()(const int tri) {
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std::swap(halfedge[3 * tri], halfedge[3 * tri + 2]);
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for (const int i : {0, 1, 2}) {
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std::swap(halfedge[3 * tri + i].startVert, halfedge[3 * tri + i].endVert);
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halfedge[3 * tri + i].pairedHalfedge =
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FlipHalfedge(halfedge[3 * tri + i].pairedHalfedge);
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}
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}
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};
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} // namespace
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