134 lines
4.1 KiB
C++
134 lines
4.1 KiB
C++
/*
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QGLView
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Copyright (C) 2019 Ivan Pelipenko peri4ko@yandex.ru
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "loader_assimp.h"
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#include "glscene.h"
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#include "glmesh.h"
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#include "glmaterial.h"
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#include "globject.h"
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#include <assimp/Importer.hpp>
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#include <assimp/postprocess.h>
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#include <assimp/scene.h>
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#include <assimp/mesh.h>
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#include <assimp/material.h>
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QVector3D fromAiVector3D(const aiVector3D & v) {return QVector3D(v.x, v.y, v.z);}
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Vector3i fromAiFace (const aiFace & v) {return Vector3i(v.mIndices[0], v.mIndices[1], v.mIndices[2]);}
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QMatrix4x4 fromAiMatrix4D(const aiMatrix4x4 & v) {return QMatrix4x4(v.a1, v.a2, v.a3, v.a4,
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v.b1, v.b2, v.b3, v.b4,
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v.c1, v.c2, v.c3, v.c4,
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v.d1, v.d2, v.d3, v.d4);}
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bool isAiMeshTriangles(const aiMesh * m) {return (m->mPrimitiveTypes & aiPrimitiveType_TRIANGLE) == aiPrimitiveType_TRIANGLE;}
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Mesh * assimpMesh(const aiMesh * m) {
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if (!m) return 0;
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if (!isAiMeshTriangles(m)) return 0;
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Mesh * ret = new Mesh();
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int vcnt = m->mNumVertices, tcnt = m->mNumFaces;
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QVector<QVector3D> & v(ret->vertices()); v.resize(vcnt);
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QVector<QVector2D> & t(ret->texcoords()); t.resize(vcnt);
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QVector< Vector3i> & ind(ret->indices());
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for (int i = 0; i < vcnt; ++i)
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v[i] = fromAiVector3D(m->mVertices[i]);
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if (m->HasNormals()) {
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QVector<QVector3D> & n(ret->normals());
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n.resize(vcnt);
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for (int i = 0; i < vcnt; ++i)
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n[i] = fromAiVector3D(m->mNormals[i]);
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}
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if (m->HasTextureCoords(0)) {
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for (int i = 0; i < vcnt; ++i)
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t[i] = fromAiVector3D(m->mTextureCoords[0][i]).toVector2D();
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}
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if (m->HasFaces()) {
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ind.resize(tcnt);
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for (int i = 0; i < tcnt; ++i)
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ind[i] = fromAiFace(m->mFaces[i]);
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} else {
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tcnt = vcnt / 3;
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ind.resize(tcnt);
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int si = 0;
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for (int i = 0; i < tcnt; ++i) {
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si = i+i+i;
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ind[i] = Vector3i(si, si+1, si+2);
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}
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}
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//qDebug() << "add mesh" << v.size() << ret->normals().size() << ret->texcoords().size() << ret->indices().size();
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return ret;
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}
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ObjectBase * assimpObject(const aiNode * n, const QVector<Mesh * > & meshes) {
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if (!n) return 0;
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ObjectBase * ret = new ObjectBase();
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ret->setName(n->mName.C_Str());
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ret->setTransform(fromAiMatrix4D(n->mTransformation));
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//qDebug() << "add object" << ret << ret->name();
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for (uint i = 0; i < n->mNumMeshes; ++i) {
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int mi = n->mMeshes[i];
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if (meshes[mi]) {
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ret->setMesh(meshes[mi]);
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//qDebug() << "set mesh" << mi << ret->mesh();
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break;
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}
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}
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for (uint i = 0; i < n->mNumChildren; ++i) {
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ObjectBase * co = assimpObject(n->mChildren[i], meshes);
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if (co) ret->addChild(co);
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}
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return ret;
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}
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Scene * loadScene(const QString & filepath) {
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if (filepath.isEmpty()) return 0;
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qDebug() << "[Loader Assimp] Import" << filepath << "...";
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Assimp::Importer importer;
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const aiScene * ais = importer.ReadFile(filepath.toUtf8(), aiProcess_Triangulate |
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aiProcess_SortByPType |
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aiProcess_GenUVCoords |
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aiProcess_TransformUVCoords);
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if (!ais) {
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qDebug() << "[Loader Assimp] Error: \"" + QString(importer.GetErrorString()) + "\"";
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return 0;
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}
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qDebug() << "[Loader Assimp] Imported" << ais->mNumMeshes << "meshes";
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QVector<Mesh * > meshes;
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for (uint i = 0; i < ais->mNumMeshes; ++i)
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meshes << assimpMesh(ais->mMeshes[i]);
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ObjectBase * root = assimpObject(ais->mRootNode, meshes);
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if (!root) return 0;
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Scene * scene = new Scene();
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scene->setName(root->name());
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foreach (ObjectBase * o, root->children())
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scene->addObject(o);
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return scene;
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}
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