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authorsanine <sanine.not@pm.me>2022-03-04 10:47:15 -0600
committersanine <sanine.not@pm.me>2022-03-04 10:47:15 -0600
commit058f98a63658dc1a2579826ba167fd61bed1e21f (patch)
treebcba07a1615a14d943f3af3f815a42f3be86b2f3 /src/mesh/assimp-master/code/PostProcessing/GenFaceNormalsProcess.cpp
parent2f8028ac9e0812cb6f3cbb08f0f419e4e717bd22 (diff)
add assimp submodule
Diffstat (limited to 'src/mesh/assimp-master/code/PostProcessing/GenFaceNormalsProcess.cpp')
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1 files changed, 147 insertions, 0 deletions
diff --git a/src/mesh/assimp-master/code/PostProcessing/GenFaceNormalsProcess.cpp b/src/mesh/assimp-master/code/PostProcessing/GenFaceNormalsProcess.cpp
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+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2022, assimp team
+
+
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+ copyright notice, this list of conditions and the
+ following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+ copyright notice, this list of conditions and the
+ following disclaimer in the documentation and/or other
+ materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+ contributors may be used to endorse or promote products
+ derived from this software without specific prior
+ written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+/** @file Implementation of the post processing step to generate face
+* normals for all imported faces.
+*/
+
+#include "GenFaceNormalsProcess.h"
+#include <assimp/Exceptional.h>
+#include <assimp/postprocess.h>
+#include <assimp/qnan.h>
+#include <assimp/scene.h>
+#include <assimp/DefaultLogger.hpp>
+
+using namespace Assimp;
+
+// ------------------------------------------------------------------------------------------------
+// Constructor to be privately used by Importer
+GenFaceNormalsProcess::GenFaceNormalsProcess() {
+ // nothing to do here
+}
+
+// ------------------------------------------------------------------------------------------------
+// Destructor, private as well
+GenFaceNormalsProcess::~GenFaceNormalsProcess() {
+ // nothing to do here
+}
+
+// ------------------------------------------------------------------------------------------------
+// Returns whether the processing step is present in the given flag field.
+bool GenFaceNormalsProcess::IsActive(unsigned int pFlags) const {
+ force_ = (pFlags & aiProcess_ForceGenNormals) != 0;
+ flippedWindingOrder_ = (pFlags & aiProcess_FlipWindingOrder) != 0;
+ return (pFlags & aiProcess_GenNormals) != 0;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Executes the post processing step on the given imported data.
+void GenFaceNormalsProcess::Execute(aiScene *pScene) {
+ ASSIMP_LOG_DEBUG("GenFaceNormalsProcess begin");
+
+ if (pScene->mFlags & AI_SCENE_FLAGS_NON_VERBOSE_FORMAT) {
+ throw DeadlyImportError("Post-processing order mismatch: expecting pseudo-indexed (\"verbose\") vertices here");
+ }
+
+ bool bHas = false;
+ for (unsigned int a = 0; a < pScene->mNumMeshes; a++) {
+ if (this->GenMeshFaceNormals(pScene->mMeshes[a])) {
+ bHas = true;
+ }
+ }
+ if (bHas) {
+ ASSIMP_LOG_INFO("GenFaceNormalsProcess finished. "
+ "Face normals have been calculated");
+ } else {
+ ASSIMP_LOG_DEBUG("GenFaceNormalsProcess finished. "
+ "Normals are already there");
+ }
+}
+
+// ------------------------------------------------------------------------------------------------
+// Executes the post processing step on the given imported data.
+bool GenFaceNormalsProcess::GenMeshFaceNormals(aiMesh *pMesh) {
+ if (nullptr != pMesh->mNormals) {
+ if (force_) {
+ delete[] pMesh->mNormals;
+ } else {
+ return false;
+ }
+ }
+
+ // If the mesh consists of lines and/or points but not of
+ // triangles or higher-order polygons the normal vectors
+ // are undefined.
+ if (!(pMesh->mPrimitiveTypes & (aiPrimitiveType_TRIANGLE | aiPrimitiveType_POLYGON))) {
+ ASSIMP_LOG_INFO("Normal vectors are undefined for line and point meshes");
+ return false;
+ }
+
+ // allocate an array to hold the output normals
+ pMesh->mNormals = new aiVector3D[pMesh->mNumVertices];
+ const float qnan = get_qnan();
+
+ // iterate through all faces and compute per-face normals but store them per-vertex.
+ for (unsigned int a = 0; a < pMesh->mNumFaces; a++) {
+ const aiFace &face = pMesh->mFaces[a];
+ if (face.mNumIndices < 3) {
+ // either a point or a line -> no well-defined normal vector
+ for (unsigned int i = 0; i < face.mNumIndices; ++i) {
+ pMesh->mNormals[face.mIndices[i]] = aiVector3D(qnan);
+ }
+ continue;
+ }
+
+ const aiVector3D *pV1 = &pMesh->mVertices[face.mIndices[0]];
+ const aiVector3D *pV2 = &pMesh->mVertices[face.mIndices[1]];
+ const aiVector3D *pV3 = &pMesh->mVertices[face.mIndices[face.mNumIndices - 1]];
+ if (flippedWindingOrder_)
+ std::swap( pV2, pV3 );
+ const aiVector3D vNor = ((*pV2 - *pV1) ^ (*pV3 - *pV1)).NormalizeSafe();
+
+ for (unsigned int i = 0; i < face.mNumIndices; ++i) {
+ pMesh->mNormals[face.mIndices[i]] = vNor;
+ }
+ }
+ return true;
+}