316 lines
9.8 KiB
C++
316 lines
9.8 KiB
C++
// Copyright (C) 2015 Jérôme Leclercq
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// This file is part of the "Nazara Engine - Graphics module"
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// For conditions of distribution and use, see copyright notice in Config.hpp
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#include <Nazara/Graphics/Loaders/OBJ.hpp>
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#include <Nazara/Core/Algorithm.hpp>
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#include <Nazara/Core/ErrorFlags.hpp>
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#include <Nazara/Graphics/Material.hpp>
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#include <Nazara/Graphics/Model.hpp>
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#include <Nazara/Graphics/Loaders/OBJ/MTLParser.hpp>
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#include <Nazara/Graphics/Loaders/OBJ/OBJParser.hpp>
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#include <Nazara/Utility/BufferMapper.hpp>
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#include <Nazara/Utility/IndexMapper.hpp>
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#include <Nazara/Utility/Mesh.hpp>
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#include <Nazara/Utility/StaticMesh.hpp>
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#include <limits>
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#include <memory>
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#include <unordered_map>
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#include <Nazara/Graphics/Debug.hpp>
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///TODO: N'avoir qu'un seul VertexBuffer communs à tous les meshes
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namespace
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{
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bool IsSupported(const NzString& extension)
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{
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return (extension == "obj");
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}
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nzTernary Check(NzInputStream& stream, const NzModelParameters& parameters)
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{
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NazaraUnused(stream);
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NazaraUnused(parameters);
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return nzTernary_Unknown;
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}
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bool LoadMaterials(NzModel* model, const NzString& filePath, const NzMaterialParams& parameters, const NzString* materials, const NzOBJParser::Mesh* meshes, unsigned int meshCount)
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{
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NzFile file(filePath);
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if (!file.Open(NzFile::ReadOnly | NzFile::Text))
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{
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NazaraError("Failed to open MTL file (" + file.GetPath() + ')');
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return false;
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}
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NzMTLParser materialParser(file);
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if (!materialParser.Parse())
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{
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NazaraError("MTL parser failed");
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return false;
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}
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std::unordered_map<NzString, NzMaterialRef> materialCache;
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NzString baseDir = file.GetDirectory();
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for (unsigned int i = 0; i < meshCount; ++i)
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{
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const NzString& matName = materials[meshes[i].material];
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const NzMTLParser::Material* mtlMat = materialParser.GetMaterial(matName);
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if (!mtlMat)
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{
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NazaraWarning("MTL has no material \"" + matName + '"');
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continue;
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}
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auto it = materialCache.find(matName);
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if (it == materialCache.end())
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{
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NzMaterialRef material = NzMaterial::New();
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material->SetShader(parameters.shaderName);
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nzUInt8 alphaValue = static_cast<nzUInt8>(mtlMat->alpha*255.f);
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NzColor ambientColor(mtlMat->ambient);
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NzColor diffuseColor(mtlMat->diffuse);
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NzColor specularColor(mtlMat->specular);
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ambientColor.a = alphaValue;
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diffuseColor.a = alphaValue;
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specularColor.a = alphaValue;
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material->SetAmbientColor(ambientColor);
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material->SetDiffuseColor(diffuseColor);
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material->SetSpecularColor(specularColor);
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material->SetShininess(mtlMat->shininess);
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bool isTranslucent = (alphaValue != 255);
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if (parameters.loadAlphaMap && !mtlMat->alphaMap.IsEmpty())
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{
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if (material->SetAlphaMap(baseDir + mtlMat->alphaMap))
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isTranslucent = true; // Une alpha map indique de la transparence
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else
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NazaraWarning("Failed to load alpha map (" + mtlMat->alphaMap + ')');
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}
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if (parameters.loadDiffuseMap && !mtlMat->diffuseMap.IsEmpty())
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{
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if (!material->SetDiffuseMap(baseDir + mtlMat->diffuseMap))
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NazaraWarning("Failed to load diffuse map (" + mtlMat->diffuseMap + ')');
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}
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if (parameters.loadSpecularMap && !mtlMat->specularMap.IsEmpty())
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{
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if (!material->SetSpecularMap(baseDir + mtlMat->specularMap))
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NazaraWarning("Failed to load specular map (" + mtlMat->specularMap + ')');
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}
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// Si nous avons une alpha map ou des couleurs transparentes,
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// nous devons configurer le matériau pour accepter la transparence au mieux
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if (isTranslucent)
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{
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// On paramètre le matériau pour accepter la transparence au mieux
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material->Enable(nzRendererParameter_Blend, true);
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material->Enable(nzRendererParameter_DepthWrite, false);
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material->SetDstBlend(nzBlendFunc_InvSrcAlpha);
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material->SetSrcBlend(nzBlendFunc_SrcAlpha);
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}
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it = materialCache.emplace(matName, std::move(material)).first;
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}
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model->SetMaterial(meshes[i].material, it->second);
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}
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}
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bool Load(NzModel* model, NzInputStream& stream, const NzModelParameters& parameters)
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{
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NzOBJParser parser(stream);
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if (!parser.Parse())
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{
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NazaraError("OBJ parser failed");
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return false;
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}
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NzMeshRef mesh = NzMesh::New();
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if (!mesh->CreateStatic()) // Ne devrait jamais échouer
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{
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NazaraInternalError("Failed to create mesh");
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return false;
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}
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const NzString* materials = parser.GetMaterials();
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const NzVector4f* positions = parser.GetPositions();
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const NzVector3f* normals = parser.GetNormals();
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const NzVector3f* texCoords = parser.GetTexCoords();
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const NzOBJParser::Mesh* meshes = parser.GetMeshes();
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unsigned int meshCount = parser.GetMeshCount();
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NazaraAssert(materials != nullptr && positions != nullptr && normals != nullptr &&
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texCoords != nullptr && meshes != nullptr && meshCount > 0,
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"Invalid OBJParser output");
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// Un conteneur temporaire pour contenir les indices de face avant triangulation
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std::vector<unsigned int> faceIndices(3); // Comme il y aura au moins trois sommets
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for (unsigned int i = 0; i < meshCount; ++i)
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{
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unsigned int faceCount = meshes[i].faces.size();
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if (faceCount == 0)
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continue;
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std::vector<unsigned int> indices;
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indices.reserve(faceCount*3); // Pire cas si les faces sont des triangles
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// Afin d'utiliser OBJParser::FaceVertex comme clé dans un unordered_map,
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// nous devons fournir un foncteur de hash ainsi qu'un foncteur de comparaison
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// Hash
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struct FaceVertexHasher
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{
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std::size_t operator()(const NzOBJParser::FaceVertex& o) const
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{
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std::size_t seed = 0;
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NzHashCombine(seed, o.normal);
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NzHashCombine(seed, o.position);
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NzHashCombine(seed, o.texCoord);
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return seed;
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}
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};
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// Comparaison
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struct FaceVertexComparator
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{
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bool operator()(const NzOBJParser::FaceVertex& lhs, const NzOBJParser::FaceVertex& rhs) const
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{
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return lhs.normal == rhs.normal &&
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lhs.position == rhs.position &&
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lhs.texCoord == rhs.texCoord;
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}
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};
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std::unordered_map<NzOBJParser::FaceVertex, unsigned int, FaceVertexHasher, FaceVertexComparator> vertices;
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unsigned int vertexCount = 0;
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for (unsigned int j = 0; j < faceCount; ++j)
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{
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unsigned int faceVertexCount = meshes[i].faces[j].vertices.size();
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faceIndices.resize(faceVertexCount);
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for (unsigned int k = 0; k < faceVertexCount; ++k)
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{
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const NzOBJParser::FaceVertex& vertex = meshes[i].faces[j].vertices[k];
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auto it = vertices.find(vertex);
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if (it == vertices.end())
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it = vertices.emplace(vertex, vertexCount++).first;
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faceIndices[k] = it->second;
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}
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for (unsigned int k = 1; k < faceVertexCount-1; ++k)
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{
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indices.push_back(faceIndices[0]);
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indices.push_back(faceIndices[k]);
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indices.push_back(faceIndices[k+1]);
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}
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}
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// Création des buffers
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NzIndexBufferRef indexBuffer = NzIndexBuffer::New(vertexCount > std::numeric_limits<nzUInt16>::max(), indices.size(), parameters.mesh.storage, nzBufferUsage_Static);
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NzVertexBufferRef vertexBuffer = NzVertexBuffer::New(NzVertexDeclaration::Get(nzVertexLayout_XYZ_Normal_UV_Tangent), vertexCount, parameters.mesh.storage, nzBufferUsage_Static);
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// Remplissage des indices
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NzIndexMapper indexMapper(indexBuffer, nzBufferAccess_WriteOnly);
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for (unsigned int j = 0; j < indices.size(); ++j)
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indexMapper.Set(j, indices[j]);
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indexMapper.Unmap(); // Pour laisser les autres tâches affecter l'index buffer
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// Remplissage des vertices
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bool hasNormals = true;
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bool hasTexCoords = true;
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NzBufferMapper<NzVertexBuffer> vertexMapper(vertexBuffer, nzBufferAccess_WriteOnly);
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NzMeshVertex* meshVertices = static_cast<NzMeshVertex*>(vertexMapper.GetPointer());
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for (auto& vertexPair : vertices)
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{
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const NzOBJParser::FaceVertex& vertexIndices = vertexPair.first;
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unsigned int index = vertexPair.second;
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NzMeshVertex& vertex = meshVertices[index];
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const NzVector4f& vec = positions[vertexIndices.position];
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vertex.position.Set(vec.x, vec.y, vec.z);
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vertex.position *= parameters.mesh.scale/vec.w;
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if (vertexIndices.normal >= 0)
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vertex.normal = normals[vertexIndices.normal];
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else
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hasNormals = false;
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if (vertexIndices.texCoord >= 0)
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{
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const NzVector3f& uvw = texCoords[vertexIndices.texCoord];
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vertex.uv.Set(uvw.x, (parameters.mesh.flipUVs) ? 1.f - uvw.y : uvw.y); // Inversion des UVs si demandé
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}
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else
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hasTexCoords = false;
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}
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vertexMapper.Unmap();
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NzStaticMeshRef subMesh = NzStaticMesh::New(mesh);
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if (!subMesh->Create(vertexBuffer))
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{
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NazaraError("Failed to create StaticMesh");
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continue;
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}
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if (parameters.mesh.optimizeIndexBuffers)
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indexBuffer->Optimize();
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subMesh->GenerateAABB();
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subMesh->SetIndexBuffer(indexBuffer);
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subMesh->SetMaterialIndex(meshes[i].material);
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subMesh->SetPrimitiveMode(nzPrimitiveMode_TriangleList);
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// Ce que nous pouvons générer dépend des données à disposition (par exemple les tangentes nécessitent des coordonnées de texture)
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if (hasNormals && hasTexCoords)
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subMesh->GenerateTangents();
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else if (hasTexCoords)
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subMesh->GenerateNormalsAndTangents();
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else
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subMesh->GenerateNormals();
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mesh->AddSubMesh(meshes[i].name + '_' + materials[meshes[i].material], subMesh);
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}
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mesh->SetMaterialCount(parser.GetMaterialCount());
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if (parameters.mesh.center)
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mesh->Recenter();
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model->SetMesh(mesh);
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// On charge les matériaux si demandé
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NzString mtlLib = parser.GetMtlLib();
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if (parameters.loadMaterials && !mtlLib.IsEmpty())
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{
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NzErrorFlags flags(nzErrorFlag_ThrowExceptionDisabled);
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LoadMaterials(model, stream.GetDirectory() + mtlLib, parameters.material, materials, meshes, meshCount);
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}
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return true;
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}
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}
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void NzLoaders_OBJ_Register()
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{
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NzModelLoader::RegisterLoader(IsSupported, Check, Load);
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}
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void NzLoaders_OBJ_Unregister()
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{
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NzModelLoader::UnregisterLoader(IsSupported, Check, Load);
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}
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