Utility/Formats: Add OBJSaver (WIP)

Former-commit-id: 8f5fab2823f86ff5b12348eacfe238c74281c235 [formerly 9c9ad4880ee31052ae1850c53e4781690ce69f49]
Former-commit-id: bde101aca68d5c6d205bb3d2252d656a6f7e078f

src/Nazara/Utility/Formats/OBJSaver.cpp

@@ -0,0 +1,228 @@
+// Copyright (C) 2016 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Utility module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#include <Nazara/Utility/Formats/OBJLoader.hpp>
+#include <Nazara/Core/Algorithm.hpp>
+#include <Nazara/Core/ErrorFlags.hpp>
+#include <Nazara/Utility/BufferMapper.hpp>
+#include <Nazara/Utility/IndexMapper.hpp>
+#include <Nazara/Utility/MaterialData.hpp>
+#include <Nazara/Utility/Mesh.hpp>
+#include <Nazara/Utility/StaticMesh.hpp>
+#include <Nazara/Utility/TriangleIterator.hpp>
+#include <Nazara/Utility/VertexMapper.hpp>
+#include <Nazara/Utility/Formats/MTLParser.hpp>
+#include <Nazara/Utility/Formats/OBJParser.hpp>
+#include <cstdio>
+#include <limits>
+#include <map>
+#include <memory>
+#include <unordered_set>
+#include <Nazara/Utility/Debug.hpp>
+
+namespace Nz
+{
+	namespace
+	{
+		template<typename T>
+		class VertexCache
+		{
+			public:
+				VertexCache(T* ptr) :
+				m_count(0),
+				m_buffer(ptr)
+				{
+				}
+
+				std::size_t GetCount() const
+				{
+					return m_count;
+				}
+
+				std::size_t Insert(const T& data)
+				{
+					auto it = m_cache.find(data);
+					if (it == m_cache.end())
+					{
+						it = m_cache.insert(std::make_pair(data, m_count)).first;
+						m_buffer[m_count] = data;
+						m_count++;
+					}
+
+					return it->second + 1;
+				}
+
+			private:
+				std::size_t m_count;
+				std::map<T, std::size_t> m_cache;
+				T* m_buffer;
+		};
+
+		bool IsSupported(const String& extension)
+		{
+			return (extension == "obj");
+		}
+
+		bool SaveToStream(const Mesh& mesh, const String& format, Stream& stream, const MeshParams& parameters)
+		{
+			if (!mesh.IsValid())
+			{
+				NazaraError("Invalid mesh");
+				return false;
+			}
+
+			if (mesh.IsAnimable())
+			{
+				NazaraError("An animated mesh cannot be saved to " + format + " format");
+				return false;
+			}
+
+			std::size_t worstCacheVertexCount = mesh.GetVertexCount();
+			OBJParser objFormat;
+			objFormat.SetNormalCount(worstCacheVertexCount);
+			objFormat.SetPositionCount(worstCacheVertexCount);
+			objFormat.SetTexCoordCount(worstCacheVertexCount);
+
+			String mtlPath = stream.GetPath();
+			if (!mtlPath.IsEmpty())
+			{
+				mtlPath.Replace(".obj", ".mtl");
+				String fileName = mtlPath.SubStringFrom(NAZARA_DIRECTORY_SEPARATOR, -1, true);
+				if (!fileName.IsEmpty())
+					objFormat.SetMtlLib(fileName);
+			}
+
+			VertexCache<Vector3f> normalCache(objFormat.GetNormals());
+			VertexCache<Vector4f> positionCache(objFormat.GetPositions());
+			VertexCache<Vector3f> texCoordsCache(objFormat.GetTexCoords());
+
+			// Materials
+			MTLParser mtlFormat;
+			std::unordered_set<String> registredMaterials;
+
+			std::size_t matCount = mesh.GetMaterialCount();
+			String* materialNames = objFormat.SetMaterialCount(matCount);
+			for (std::size_t i = 0; i < matCount; ++i)
+			{
+				const ParameterList& matData = mesh.GetMaterialData(i);
+
+				String name;
+				if (!matData.GetStringParameter(MaterialData::Name, &name))
+					name = "material_" + String::Number(i);
+
+				// Makes sure we only have one material of that name
+				while (registredMaterials.find(name) != registredMaterials.end())
+					name += '_';
+
+				registredMaterials.insert(name);
+				materialNames[i] = name;
+
+				MTLParser::Material* material = mtlFormat.AddMaterial(name);
+
+				bool bValue;
+				String strVal;
+				if (matData.GetBooleanParameter(MaterialData::CustomDefined, &bValue) && bValue)
+				{
+					Color colorVal;
+					float fValue;
+
+					if (matData.GetColorParameter(MaterialData::AmbientColor, &colorVal))
+						material->ambient = colorVal;
+
+					if (matData.GetColorParameter(MaterialData::DiffuseColor, &colorVal))
+						material->diffuse = colorVal;
+
+					if (matData.GetColorParameter(MaterialData::SpecularColor, &colorVal))
+						material->specular = colorVal;
+
+					if (matData.GetFloatParameter(MaterialData::Shininess, &fValue))
+						material->shininess = fValue;
+
+					if (matData.GetStringParameter(MaterialData::AlphaTexturePath, &strVal))
+						material->alphaMap = strVal;
+
+					if (matData.GetStringParameter(MaterialData::DiffuseTexturePath, &strVal))
+						material->diffuseMap = strVal;
+
+					if (matData.GetStringParameter(MaterialData::SpecularTexturePath, &strVal))
+						material->specularMap = strVal;
+				}
+				else if (matData.GetStringParameter(MaterialData::FilePath, &strVal))
+					material->diffuseMap = strVal;
+			}
+
+			// Meshes
+			std::size_t meshCount = mesh.GetSubMeshCount();
+			OBJParser::Mesh* meshes = objFormat.SetMeshCount(meshCount);
+			for (std::size_t i = 0; i < meshCount; ++i)
+			{
+				const StaticMesh* staticMesh = static_cast<const StaticMesh*>(mesh.GetSubMesh(i));
+
+				std::size_t triangleCount = staticMesh->GetTriangleCount();
+				std::size_t vertexCount = staticMesh->GetVertexCount();
+
+				meshes[i].faces.resize(triangleCount);
+				meshes[i].vertices.resize(triangleCount * 3);
+
+				{
+					VertexMapper vertexMapper(staticMesh);
+
+					SparsePtr<Vector3f> normalPtr = vertexMapper.GetComponentPtr<Vector3f>(VertexComponent_Normal);
+					SparsePtr<Vector3f> positionPtr = vertexMapper.GetComponentPtr<Vector3f>(VertexComponent_Position);
+					SparsePtr<Vector2f> texCoordsPtr = vertexMapper.GetComponentPtr<Vector2f>(VertexComponent_TexCoord);
+
+					std::size_t faceIndex = 0;
+					TriangleIterator triangle(staticMesh);
+					do 
+					{
+						OBJParser::Face& face = meshes[i].faces[faceIndex];
+						face.firstVertex = faceIndex * 3;
+						face.vertexCount = 3;
+
+						for (std::size_t j = 0; j < 3; ++j)
+						{
+							OBJParser::FaceVertex& vertexIndices = meshes[i].vertices[face.firstVertex + j];
+
+							std::size_t index = triangle[j];
+							vertexIndices.normal = normalCache.Insert(normalPtr[index]);
+							vertexIndices.position = positionCache.Insert(positionPtr[index]);
+							vertexIndices.texCoord = texCoordsCache.Insert(texCoordsPtr[index]);
+						}
+
+						faceIndex++;
+					}
+					while (triangle.Advance());
+				}
+			}
+
+			objFormat.SetNormalCount(normalCache.GetCount());
+			objFormat.SetPositionCount(positionCache.GetCount());
+			objFormat.SetTexCoordCount(texCoordsCache.GetCount());
+
+			objFormat.Save(stream);
+
+			if (!mtlPath.IsEmpty())
+			{
+				File mtlFile(mtlPath, OpenMode_WriteOnly | OpenMode_Truncate);
+				if (mtlFile.IsOpen())
+					mtlFormat.Save(mtlFile);
+			}
+
+			return true;
+		}
+	}
+
+	namespace Loaders
+	{
+		void RegisterOBJSaver()
+		{
+			MeshSaver::RegisterSaver(IsSupported, SaveToStream);
+		}
+
+		void UnregisterOBJSaver()
+		{
+			MeshSaver::UnregisterSaver(IsSupported, SaveToStream);
+		}
+	}
+}

src/Nazara/Utility/Formats/OBJSaver.hpp

@@ -0,0 +1,21 @@
+// Copyright (C) 2015 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Graphics module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#pragma once
+
+#ifndef NAZARA_FORMATS_OBJSAVER_HPP
+#define NAZARA_FORMATS_OBJSAVER_HPP
+
+#include <Nazara/Prerequesites.hpp>
+
+namespace Nz
+{
+	namespace Loaders
+	{
+		void RegisterOBJSaver();
+		void UnregisterOBJSaver();
+	}
+}
+
+#endif // NAZARA_FORMATS_OBJSAVER_HPP

src/Nazara/Utility/Utility.cpp

@@ -26,6 +26,7 @@
 #include <Nazara/Utility/Formats/MD5AnimLoader.hpp>
 #include <Nazara/Utility/Formats/MD5MeshLoader.hpp>
 #include <Nazara/Utility/Formats/OBJLoader.hpp>
+#include <Nazara/Utility/Formats/OBJSaver.hpp>
 #include <Nazara/Utility/Formats/PCXLoader.hpp>
 #include <Nazara/Utility/Formats/STBLoader.hpp>
 #include <Nazara/Utility/Formats/STBSaver.hpp>
@@ -125,10 +126,12 @@ namespace Nz
 
 		// Mesh (text)
 		Loaders::RegisterOBJLoader();
+		Loaders::RegisterOBJSaver();
 
 		// Mesh
 		Loaders::RegisterMD2(); // Loader de fichiers .md2 (v8)
 		Loaders::RegisterMD5Mesh(); // Loader de fichiers .md5mesh (v10)
+		Loaders::RegisterOBJLoader(); // Loader de fichiers .md5mesh (v10)
 
 		// Image
 		Loaders::RegisterPCX(); // Loader de fichiers .pcx (1, 4, 8, 24 bits)
@@ -163,6 +166,7 @@ namespace Nz
 		Loaders::UnregisterMD5Anim();
 		Loaders::UnregisterMD5Mesh();
 		Loaders::UnregisterOBJLoader();
+		Loaders::UnregisterOBJSaver();
 		Loaders::UnregisterPCX();
 		Loaders::UnregisterSTBLoader();
 		Loaders::UnregisterSTBSaver();