diff options
Diffstat (limited to 'src/mesh/assimp-master/code/AssetLib/glTF/glTFExporter.cpp')
| -rw-r--r-- | src/mesh/assimp-master/code/AssetLib/glTF/glTFExporter.cpp | 1065 |
1 files changed, 1065 insertions, 0 deletions
diff --git a/src/mesh/assimp-master/code/AssetLib/glTF/glTFExporter.cpp b/src/mesh/assimp-master/code/AssetLib/glTF/glTFExporter.cpp new file mode 100644 index 0000000..afcfb12 --- /dev/null +++ b/src/mesh/assimp-master/code/AssetLib/glTF/glTFExporter.cpp @@ -0,0 +1,1065 @@ +/* +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. + +---------------------------------------------------------------------- +*/ +#ifndef ASSIMP_BUILD_NO_EXPORT +#ifndef ASSIMP_BUILD_NO_GLTF_EXPORTER + +#include "AssetLib/glTF/glTFExporter.h" +#include "AssetLib/glTF/glTFAssetWriter.h" +#include "PostProcessing/SplitLargeMeshes.h" + +#include <assimp/commonMetaData.h> +#include <assimp/Exceptional.h> +#include <assimp/StringComparison.h> +#include <assimp/ByteSwapper.h> +#include <assimp/SceneCombiner.h> +#include <assimp/version.h> +#include <assimp/IOSystem.hpp> +#include <assimp/Exporter.hpp> +#include <assimp/material.h> +#include <assimp/scene.h> + +// Header files, standard library. +#include <memory> +#include <limits> +#include <inttypes.h> + +#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC + // Header files, Open3DGC. +# include <Open3DGC/o3dgcSC3DMCEncoder.h> +#endif + +using namespace rapidjson; + +using namespace Assimp; +using namespace glTF; + +namespace Assimp { + + // ------------------------------------------------------------------------------------------------ + // Worker function for exporting a scene to GLTF. Prototyped and registered in Exporter.cpp + void ExportSceneGLTF(const char* pFile, IOSystem* pIOSystem, const aiScene* pScene, const ExportProperties* pProperties) + { + // invoke the exporter + glTFExporter exporter(pFile, pIOSystem, pScene, pProperties, false); + } + + // ------------------------------------------------------------------------------------------------ + // Worker function for exporting a scene to GLB. Prototyped and registered in Exporter.cpp + void ExportSceneGLB(const char* pFile, IOSystem* pIOSystem, const aiScene* pScene, const ExportProperties* pProperties) + { + // invoke the exporter + glTFExporter exporter(pFile, pIOSystem, pScene, pProperties, true); + } + +} // end of namespace Assimp + +glTFExporter::glTFExporter(const char* filename, IOSystem* pIOSystem, const aiScene* pScene, + const ExportProperties* pProperties, bool isBinary) + : mFilename(filename) + , mIOSystem(pIOSystem) + , mProperties(pProperties) +{ + aiScene* sceneCopy_tmp; + SceneCombiner::CopyScene(&sceneCopy_tmp, pScene); + + SplitLargeMeshesProcess_Triangle tri_splitter; + tri_splitter.SetLimit(0xffff); + tri_splitter.Execute(sceneCopy_tmp); + + SplitLargeMeshesProcess_Vertex vert_splitter; + vert_splitter.SetLimit(0xffff); + vert_splitter.Execute(sceneCopy_tmp); + + mScene.reset(sceneCopy_tmp); + + mAsset.reset( new glTF::Asset( pIOSystem ) ); + + if (isBinary) { + mAsset->SetAsBinary(); + } + + ExportMetadata(); + + //for (unsigned int i = 0; i < pScene->mNumCameras; ++i) {} + + //for (unsigned int i = 0; i < pScene->mNumLights; ++i) {} + + ExportMaterials(); + + if (mScene->mRootNode) { + ExportNodeHierarchy(mScene->mRootNode); + } + + ExportMeshes(); + + //for (unsigned int i = 0; i < pScene->mNumTextures; ++i) {} + + ExportScene(); + + ExportAnimations(); + + glTF::AssetWriter writer(*mAsset); + + if (isBinary) { + writer.WriteGLBFile(filename); + } else { + writer.WriteFile(filename); + } +} + +/* + * Copy a 4x4 matrix from struct aiMatrix to typedef mat4. + * Also converts from row-major to column-major storage. + */ +static void CopyValue(const aiMatrix4x4& v, glTF::mat4& o) +{ + o[ 0] = v.a1; o[ 1] = v.b1; o[ 2] = v.c1; o[ 3] = v.d1; + o[ 4] = v.a2; o[ 5] = v.b2; o[ 6] = v.c2; o[ 7] = v.d2; + o[ 8] = v.a3; o[ 9] = v.b3; o[10] = v.c3; o[11] = v.d3; + o[12] = v.a4; o[13] = v.b4; o[14] = v.c4; o[15] = v.d4; +} + +static void CopyValue(const aiMatrix4x4& v, aiMatrix4x4& o) +{ + memcpy(&o, &v, sizeof(aiMatrix4x4)); +} + +static void IdentityMatrix4(glTF::mat4& o) +{ + o[ 0] = 1; o[ 1] = 0; o[ 2] = 0; o[ 3] = 0; + o[ 4] = 0; o[ 5] = 1; o[ 6] = 0; o[ 7] = 0; + o[ 8] = 0; o[ 9] = 0; o[10] = 1; o[11] = 0; + o[12] = 0; o[13] = 0; o[14] = 0; o[15] = 1; +} + +template<typename T> +void SetAccessorRange(Ref<Accessor> acc, void* data, unsigned int count, + unsigned int numCompsIn, unsigned int numCompsOut) +{ + ai_assert(numCompsOut <= numCompsIn); + + // Allocate and initialize with large values. + for (unsigned int i = 0 ; i < numCompsOut ; i++) { + acc->min.push_back( std::numeric_limits<double>::max()); + acc->max.push_back(-std::numeric_limits<double>::max()); + } + + size_t totalComps = count * numCompsIn; + T* buffer_ptr = static_cast<T*>(data); + T* buffer_end = buffer_ptr + totalComps; + + // Search and set extreme values. + for (; buffer_ptr < buffer_end ; buffer_ptr += numCompsIn) { + for (unsigned int j = 0 ; j < numCompsOut ; j++) { + double valueTmp = buffer_ptr[j]; + + if (valueTmp < acc->min[j]) { + acc->min[j] = valueTmp; + } + if (valueTmp > acc->max[j]) { + acc->max[j] = valueTmp; + } + } + } +} + +inline void SetAccessorRange(ComponentType compType, Ref<Accessor> acc, void* data, + unsigned int count, unsigned int numCompsIn, unsigned int numCompsOut) +{ + switch (compType) { + case ComponentType_SHORT: + SetAccessorRange<short>(acc, data, count, numCompsIn, numCompsOut); + return; + case ComponentType_UNSIGNED_SHORT: + SetAccessorRange<unsigned short>(acc, data, count, numCompsIn, numCompsOut); + return; + case ComponentType_UNSIGNED_INT: + SetAccessorRange<unsigned int>(acc, data, count, numCompsIn, numCompsOut); + return; + case ComponentType_FLOAT: + SetAccessorRange<float>(acc, data, count, numCompsIn, numCompsOut); + return; + case ComponentType_BYTE: + SetAccessorRange<int8_t>(acc, data, count, numCompsIn, numCompsOut); + return; + case ComponentType_UNSIGNED_BYTE: + SetAccessorRange<uint8_t>(acc, data, count, numCompsIn, numCompsOut); + return; + } +} + +inline Ref<Accessor> ExportData(Asset &a, std::string &meshName, Ref<Buffer> &buffer, + unsigned int count, void *data, AttribType::Value typeIn, AttribType::Value typeOut, ComponentType compType, BufferViewTarget target = BufferViewTarget_NONE) { + if (!count || !data) return Ref<Accessor>(); + + unsigned int numCompsIn = AttribType::GetNumComponents(typeIn); + unsigned int numCompsOut = AttribType::GetNumComponents(typeOut); + unsigned int bytesPerComp = ComponentTypeSize(compType); + + size_t offset = buffer->byteLength; + // make sure offset is correctly byte-aligned, as required by spec + size_t padding = offset % bytesPerComp; + offset += padding; + size_t length = count * numCompsOut * bytesPerComp; + buffer->Grow(length + padding); + + // bufferView + Ref<BufferView> bv = a.bufferViews.Create(a.FindUniqueID(meshName, "view")); + bv->buffer = buffer; + bv->byteOffset = unsigned(offset); + bv->byteLength = length; //! The target that the WebGL buffer should be bound to. + bv->target = target; + + // accessor + Ref<Accessor> acc = a.accessors.Create(a.FindUniqueID(meshName, "accessor")); + acc->bufferView = bv; + acc->byteOffset = 0; + acc->byteStride = 0; + acc->componentType = compType; + acc->count = count; + acc->type = typeOut; + + // calculate min and max values + SetAccessorRange(compType, acc, data, count, numCompsIn, numCompsOut); + + // copy the data + acc->WriteData(count, data, numCompsIn*bytesPerComp); + + return acc; +} + +namespace { + void GetMatScalar(const aiMaterial* mat, float& val, const char* propName, int type, int idx) { + ai_assert( nullptr != mat ); + if ( nullptr != mat ) { + mat->Get(propName, type, idx, val); + } + } +} + +void glTFExporter::GetTexSampler(const aiMaterial* mat, glTF::TexProperty& prop) +{ + std::string samplerId = mAsset->FindUniqueID("", "sampler"); + prop.texture->sampler = mAsset->samplers.Create(samplerId); + + aiTextureMapMode mapU, mapV; + aiGetMaterialInteger(mat,AI_MATKEY_MAPPINGMODE_U_DIFFUSE(0),(int*)&mapU); + aiGetMaterialInteger(mat,AI_MATKEY_MAPPINGMODE_V_DIFFUSE(0),(int*)&mapV); + + switch (mapU) { + case aiTextureMapMode_Wrap: + prop.texture->sampler->wrapS = SamplerWrap_Repeat; + break; + case aiTextureMapMode_Clamp: + prop.texture->sampler->wrapS = SamplerWrap_Clamp_To_Edge; + break; + case aiTextureMapMode_Mirror: + prop.texture->sampler->wrapS = SamplerWrap_Mirrored_Repeat; + break; + case aiTextureMapMode_Decal: + default: + prop.texture->sampler->wrapS = SamplerWrap_Repeat; + break; + }; + + switch (mapV) { + case aiTextureMapMode_Wrap: + prop.texture->sampler->wrapT = SamplerWrap_Repeat; + break; + case aiTextureMapMode_Clamp: + prop.texture->sampler->wrapT = SamplerWrap_Clamp_To_Edge; + break; + case aiTextureMapMode_Mirror: + prop.texture->sampler->wrapT = SamplerWrap_Mirrored_Repeat; + break; + case aiTextureMapMode_Decal: + default: + prop.texture->sampler->wrapT = SamplerWrap_Repeat; + break; + }; + + // Hard coded Texture filtering options because I do not know where to find them in the aiMaterial. + prop.texture->sampler->magFilter = SamplerMagFilter_Linear; + prop.texture->sampler->minFilter = SamplerMinFilter_Linear; +} + +void glTFExporter::GetMatColorOrTex(const aiMaterial* mat, glTF::TexProperty& prop, + const char* propName, int type, int idx, aiTextureType tt) { + aiString tex; + aiColor4D col; + if (mat->GetTextureCount(tt) > 0) { + if (mat->Get(AI_MATKEY_TEXTURE(tt, 0), tex) == AI_SUCCESS) { + std::string path = tex.C_Str(); + + if (path.size() > 0) { + if (path[0] != '*') { + std::map<std::string, unsigned int>::iterator it = mTexturesByPath.find(path); + if (it != mTexturesByPath.end()) { + prop.texture = mAsset->textures.Get(it->second); + } + } + + if (!prop.texture) { + std::string texId = mAsset->FindUniqueID("", "texture"); + prop.texture = mAsset->textures.Create(texId); + mTexturesByPath[path] = prop.texture.GetIndex(); + + std::string imgId = mAsset->FindUniqueID("", "image"); + prop.texture->source = mAsset->images.Create(imgId); + + if (path[0] == '*') { // embedded + aiTexture* curTex = mScene->mTextures[atoi(&path[1])]; + + prop.texture->source->name = curTex->mFilename.C_Str(); + + uint8_t *data = reinterpret_cast<uint8_t *>(curTex->pcData); + prop.texture->source->SetData(data, curTex->mWidth, *mAsset); + + if (curTex->achFormatHint[0]) { + std::string mimeType = "image/"; + mimeType += (memcmp(curTex->achFormatHint, "jpg", 3) == 0) ? "jpeg" : curTex->achFormatHint; + prop.texture->source->mimeType = mimeType; + } + } else { + prop.texture->source->uri = path; + } + + GetTexSampler(mat, prop); + } + } + } + } + + if (mat->Get(propName, type, idx, col) == AI_SUCCESS) { + prop.color[0] = col.r; + prop.color[1] = col.g; + prop.color[2] = col.b; + prop.color[3] = col.a; + } +} + + +void glTFExporter::ExportMaterials() +{ + aiString aiName; + for (unsigned int i = 0; i < mScene->mNumMaterials; ++i) { + const aiMaterial* mat = mScene->mMaterials[i]; + + + std::string name; + if (mat->Get(AI_MATKEY_NAME, aiName) == AI_SUCCESS) { + name = aiName.C_Str(); + } + name = mAsset->FindUniqueID(name, "material"); + + Ref<Material> m = mAsset->materials.Create(name); + + GetMatColorOrTex(mat, m->ambient, AI_MATKEY_COLOR_AMBIENT, aiTextureType_AMBIENT); + GetMatColorOrTex(mat, m->diffuse, AI_MATKEY_COLOR_DIFFUSE, aiTextureType_DIFFUSE); + GetMatColorOrTex(mat, m->specular, AI_MATKEY_COLOR_SPECULAR, aiTextureType_SPECULAR); + GetMatColorOrTex(mat, m->emission, AI_MATKEY_COLOR_EMISSIVE, aiTextureType_EMISSIVE); + + m->transparent = mat->Get(AI_MATKEY_OPACITY, m->transparency) == aiReturn_SUCCESS && m->transparency != 1.0; + + GetMatScalar(mat, m->shininess, AI_MATKEY_SHININESS); + } +} + +/* + * Search through node hierarchy and find the node containing the given meshID. + * Returns true on success, and false otherwise. + */ +bool FindMeshNode(Ref<Node> &nodeIn, Ref<Node> &meshNode, const std::string &meshID) { + for (unsigned int i = 0; i < nodeIn->meshes.size(); ++i) { + if (meshID.compare(nodeIn->meshes[i]->id) == 0) { + meshNode = nodeIn; + return true; + } + } + + for (unsigned int i = 0; i < nodeIn->children.size(); ++i) { + if(FindMeshNode(nodeIn->children[i], meshNode, meshID)) { + return true; + } + } + + return false; +} + +/* + * Find the root joint of the skeleton. + * Starts will any joint node and traces up the tree, + * until a parent is found that does not have a jointName. + * Returns the first parent Ref<Node> found that does not have a jointName. + */ +Ref<Node> FindSkeletonRootJoint(Ref<Skin>& skinRef) +{ + Ref<Node> startNodeRef; + Ref<Node> parentNodeRef; + + // Arbitrarily use the first joint to start the search. + startNodeRef = skinRef->jointNames[0]; + parentNodeRef = skinRef->jointNames[0]; + + do { + startNodeRef = parentNodeRef; + parentNodeRef = startNodeRef->parent; + } while (!parentNodeRef->jointName.empty()); + + return parentNodeRef; +} + +void ExportSkin(Asset& mAsset, const aiMesh* aimesh, Ref<Mesh>& meshRef, Ref<Buffer>& bufferRef, Ref<Skin>& skinRef, std::vector<aiMatrix4x4>& inverseBindMatricesData) +{ + if (aimesh->mNumBones < 1) { + return; + } + + // Store the vertex joint and weight data. + const size_t NumVerts( aimesh->mNumVertices ); + vec4* vertexJointData = new vec4[ NumVerts ]; + vec4* vertexWeightData = new vec4[ NumVerts ]; + int* jointsPerVertex = new int[ NumVerts ]; + for (size_t i = 0; i < NumVerts; ++i) { + jointsPerVertex[i] = 0; + for (size_t j = 0; j < 4; ++j) { + vertexJointData[i][j] = 0; + vertexWeightData[i][j] = 0; + } + } + + for (unsigned int idx_bone = 0; idx_bone < aimesh->mNumBones; ++idx_bone) { + const aiBone* aib = aimesh->mBones[idx_bone]; + + // aib->mName =====> skinRef->jointNames + // Find the node with id = mName. + Ref<Node> nodeRef = mAsset.nodes.Get(aib->mName.C_Str()); + nodeRef->jointName = nodeRef->id; + + unsigned int jointNamesIndex = 0; + bool addJointToJointNames = true; + for ( unsigned int idx_joint = 0; idx_joint < skinRef->jointNames.size(); ++idx_joint) { + if (skinRef->jointNames[idx_joint]->jointName.compare(nodeRef->jointName) == 0) { + addJointToJointNames = false; + jointNamesIndex = idx_joint; + } + } + + if (addJointToJointNames) { + skinRef->jointNames.push_back(nodeRef); + + // aib->mOffsetMatrix =====> skinRef->inverseBindMatrices + aiMatrix4x4 tmpMatrix4; + CopyValue(aib->mOffsetMatrix, tmpMatrix4); + inverseBindMatricesData.push_back(tmpMatrix4); + jointNamesIndex = static_cast<unsigned int>(inverseBindMatricesData.size() - 1); + } + + // aib->mWeights =====> vertexWeightData + for (unsigned int idx_weights = 0; idx_weights < aib->mNumWeights; ++idx_weights) { + unsigned int vertexId = aib->mWeights[idx_weights].mVertexId; + float vertWeight = aib->mWeights[idx_weights].mWeight; + + // A vertex can only have at most four joint weights. Ignore all others. + if (jointsPerVertex[vertexId] > 3) { + continue; + } + + vertexJointData[vertexId][jointsPerVertex[vertexId]] = static_cast<float>(jointNamesIndex); + vertexWeightData[vertexId][jointsPerVertex[vertexId]] = vertWeight; + + jointsPerVertex[vertexId] += 1; + } + + } // End: for-loop mNumMeshes + + Mesh::Primitive& p = meshRef->primitives.back(); + Ref<Accessor> vertexJointAccessor = ExportData(mAsset, skinRef->id, bufferRef, aimesh->mNumVertices, vertexJointData, AttribType::VEC4, AttribType::VEC4, ComponentType_FLOAT); + if ( vertexJointAccessor ) { + p.attributes.joint.push_back( vertexJointAccessor ); + } + + Ref<Accessor> vertexWeightAccessor = ExportData(mAsset, skinRef->id, bufferRef, aimesh->mNumVertices, vertexWeightData, AttribType::VEC4, AttribType::VEC4, ComponentType_FLOAT); + if ( vertexWeightAccessor ) { + p.attributes.weight.push_back( vertexWeightAccessor ); + } + delete[] jointsPerVertex; + delete[] vertexWeightData; + delete[] vertexJointData; +} + +#if defined(__has_warning) +#if __has_warning("-Wunused-but-set-variable") +#pragma GCC diagnostic push +#pragma GCC diagnostic ignored "-Wunused-but-set-variable" +#endif +#endif + +void glTFExporter::ExportMeshes() +{ + // Not for + // using IndicesType = decltype(aiFace::mNumIndices); + // But yes for + // using IndicesType = unsigned short; + // because "ComponentType_UNSIGNED_SHORT" used for indices. And it's a maximal type according to glTF specification. + typedef unsigned short IndicesType; + + // Variables needed for compression. BEGIN. + // Indices, not pointers - because pointer to buffer is changing while writing to it. +#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC + size_t idx_srcdata_begin = 0; // Index of buffer before writing mesh data. Also, index of begin of coordinates array in buffer. + size_t idx_srcdata_normal = SIZE_MAX;// Index of begin of normals array in buffer. SIZE_MAX - mean that mesh has no normals. + size_t idx_srcdata_ind;// Index of begin of coordinates indices array in buffer. +#endif + std::vector<size_t> idx_srcdata_tc;// Array of indices. Every index point to begin of texture coordinates array in buffer. + bool comp_allow;// Point that data of current mesh can be compressed. + // Variables needed for compression. END. + + std::string fname = std::string(mFilename); + std::string bufferIdPrefix = fname.substr(0, fname.rfind(".gltf")); + std::string bufferId = mAsset->FindUniqueID("", bufferIdPrefix.c_str()); + + Ref<Buffer> b = mAsset->GetBodyBuffer(); + if (!b) { + b = mAsset->buffers.Create(bufferId); + } + + //---------------------------------------- + // Initialize variables for the skin + bool createSkin = false; + for (unsigned int idx_mesh = 0; idx_mesh < mScene->mNumMeshes; ++idx_mesh) { + const aiMesh* aim = mScene->mMeshes[idx_mesh]; + if(aim->HasBones()) { + createSkin = true; + break; + } + } + + Ref<Skin> skinRef; + std::string skinName = mAsset->FindUniqueID("skin", "skin"); + std::vector<aiMatrix4x4> inverseBindMatricesData; + if(createSkin) { + skinRef = mAsset->skins.Create(skinName); + skinRef->name = skinName; + } + //---------------------------------------- + + for (unsigned int idx_mesh = 0; idx_mesh < mScene->mNumMeshes; ++idx_mesh) { + const aiMesh* aim = mScene->mMeshes[idx_mesh]; + + // Check if compressing requested and mesh can be encoded. +#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC + comp_allow = mProperties->GetPropertyBool("extensions.Open3DGC.use", false); +#else + comp_allow = false; +#endif + + if(comp_allow && (aim->mPrimitiveTypes == aiPrimitiveType_TRIANGLE) && (aim->mNumVertices > 0) && (aim->mNumFaces > 0)) + { + idx_srcdata_tc.clear(); + idx_srcdata_tc.reserve(AI_MAX_NUMBER_OF_TEXTURECOORDS); + } + else + { + std::string msg; + + if(aim->mPrimitiveTypes != aiPrimitiveType_TRIANGLE) + msg = "all primitives of the mesh must be a triangles."; + else + msg = "mesh must has vertices and faces."; + + ASSIMP_LOG_WARN("GLTF: can not use Open3DGC-compression: ", msg); + comp_allow = false; + } + + std::string meshId = mAsset->FindUniqueID(aim->mName.C_Str(), "mesh"); + Ref<Mesh> m = mAsset->meshes.Create(meshId); + m->primitives.resize(1); + Mesh::Primitive& p = m->primitives.back(); + + p.material = mAsset->materials.Get(aim->mMaterialIndex); + + /******************* Vertices ********************/ + // If compression is used then you need parameters of uncompressed region: begin and size. At this step "begin" is stored. +#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC + if(comp_allow) idx_srcdata_begin = b->byteLength; +#endif + + Ref<Accessor> v = ExportData(*mAsset, meshId, b, aim->mNumVertices, aim->mVertices, AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT, BufferViewTarget_ARRAY_BUFFER); + if (v) p.attributes.position.push_back(v); + + /******************** Normals ********************/ +#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC + if(comp_allow && (aim->mNormals != 0)) idx_srcdata_normal = b->byteLength;// Store index of normals array. +#endif + + Ref<Accessor> n = ExportData(*mAsset, meshId, b, aim->mNumVertices, aim->mNormals, AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT, BufferViewTarget_ARRAY_BUFFER); + if (n) p.attributes.normal.push_back(n); + + /************** Texture coordinates **************/ + for (int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) { + // Flip UV y coords + if (aim -> mNumUVComponents[i] > 1) { + for (unsigned int j = 0; j < aim->mNumVertices; ++j) { + aim->mTextureCoords[i][j].y = 1 - aim->mTextureCoords[i][j].y; + } + } + + if (aim->mNumUVComponents[i] > 0) { + AttribType::Value type = (aim->mNumUVComponents[i] == 2) ? AttribType::VEC2 : AttribType::VEC3; + + if(comp_allow) idx_srcdata_tc.push_back(b->byteLength);// Store index of texture coordinates array. + + Ref<Accessor> tc = ExportData(*mAsset, meshId, b, aim->mNumVertices, aim->mTextureCoords[i], AttribType::VEC3, type, ComponentType_FLOAT, BufferViewTarget_ARRAY_BUFFER); + if (tc) p.attributes.texcoord.push_back(tc); + } + } + + /*************** Vertices indices ****************/ +#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC + idx_srcdata_ind = b->byteLength;// Store index of indices array. +#endif + + if (aim->mNumFaces > 0) { + std::vector<IndicesType> indices; + unsigned int nIndicesPerFace = aim->mFaces[0].mNumIndices; + indices.resize(aim->mNumFaces * nIndicesPerFace); + for (size_t i = 0; i < aim->mNumFaces; ++i) { + for (size_t j = 0; j < nIndicesPerFace; ++j) { + indices[i*nIndicesPerFace + j] = uint16_t(aim->mFaces[i].mIndices[j]); + } + } + + p.indices = ExportData(*mAsset, meshId, b, unsigned(indices.size()), &indices[0], AttribType::SCALAR, AttribType::SCALAR, ComponentType_UNSIGNED_SHORT, BufferViewTarget_ELEMENT_ARRAY_BUFFER); + } + + switch (aim->mPrimitiveTypes) { + case aiPrimitiveType_POLYGON: + p.mode = PrimitiveMode_TRIANGLES; break; // TODO implement this + case aiPrimitiveType_LINE: + p.mode = PrimitiveMode_LINES; break; + case aiPrimitiveType_POINT: + p.mode = PrimitiveMode_POINTS; break; + default: // aiPrimitiveType_TRIANGLE + p.mode = PrimitiveMode_TRIANGLES; + } + + /*************** Skins ****************/ + if(aim->HasBones()) { + ExportSkin(*mAsset, aim, m, b, skinRef, inverseBindMatricesData); + } + + /****************** Compression ******************/ + ///TODO: animation: weights, joints. + if(comp_allow) + { +#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC + // Only one type of compression supported at now - Open3DGC. + // + o3dgc::BinaryStream bs; + o3dgc::SC3DMCEncoder<IndicesType> encoder; + o3dgc::IndexedFaceSet<IndicesType> comp_o3dgc_ifs; + o3dgc::SC3DMCEncodeParams comp_o3dgc_params; + + // + // Fill data for encoder. + // + // Quantization + unsigned quant_coord = mProperties->GetPropertyInteger("extensions.Open3DGC.quantization.POSITION", 12); + unsigned quant_normal = mProperties->GetPropertyInteger("extensions.Open3DGC.quantization.NORMAL", 10); + unsigned quant_texcoord = mProperties->GetPropertyInteger("extensions.Open3DGC.quantization.TEXCOORD", 10); + + // Prediction + o3dgc::O3DGCSC3DMCPredictionMode prediction_position = o3dgc::O3DGC_SC3DMC_PARALLELOGRAM_PREDICTION; + o3dgc::O3DGCSC3DMCPredictionMode prediction_normal = o3dgc::O3DGC_SC3DMC_SURF_NORMALS_PREDICTION; + o3dgc::O3DGCSC3DMCPredictionMode prediction_texcoord = o3dgc::O3DGC_SC3DMC_PARALLELOGRAM_PREDICTION; + + // IndexedFacesSet: "Crease angle", "solid", "convex" are set to default. + comp_o3dgc_ifs.SetCCW(true); + comp_o3dgc_ifs.SetIsTriangularMesh(true); + comp_o3dgc_ifs.SetNumFloatAttributes(0); + // Coordinates + comp_o3dgc_params.SetCoordQuantBits(quant_coord); + comp_o3dgc_params.SetCoordPredMode(prediction_position); + comp_o3dgc_ifs.SetNCoord(aim->mNumVertices); + comp_o3dgc_ifs.SetCoord((o3dgc::Real* const)&b->GetPointer()[idx_srcdata_begin]); + // Normals + if(idx_srcdata_normal != SIZE_MAX) + { + comp_o3dgc_params.SetNormalQuantBits(quant_normal); + comp_o3dgc_params.SetNormalPredMode(prediction_normal); + comp_o3dgc_ifs.SetNNormal(aim->mNumVertices); + comp_o3dgc_ifs.SetNormal((o3dgc::Real* const)&b->GetPointer()[idx_srcdata_normal]); + } + + // Texture coordinates + for(size_t num_tc = 0; num_tc < idx_srcdata_tc.size(); num_tc++) + { + size_t num = comp_o3dgc_ifs.GetNumFloatAttributes(); + + comp_o3dgc_params.SetFloatAttributeQuantBits(static_cast<unsigned long>(num), quant_texcoord); + comp_o3dgc_params.SetFloatAttributePredMode(static_cast<unsigned long>(num), prediction_texcoord); + comp_o3dgc_ifs.SetNFloatAttribute(static_cast<unsigned long>(num), aim->mNumVertices);// number of elements. + comp_o3dgc_ifs.SetFloatAttributeDim(static_cast<unsigned long>(num), aim->mNumUVComponents[num_tc]);// components per element: aiVector3D => x * float + comp_o3dgc_ifs.SetFloatAttributeType(static_cast<unsigned long>(num), o3dgc::O3DGC_IFS_FLOAT_ATTRIBUTE_TYPE_TEXCOORD); + comp_o3dgc_ifs.SetFloatAttribute(static_cast<unsigned long>(num), (o3dgc::Real* const)&b->GetPointer()[idx_srcdata_tc[num_tc]]); + comp_o3dgc_ifs.SetNumFloatAttributes(static_cast<unsigned long>(num + 1)); + } + + // Coordinates indices + comp_o3dgc_ifs.SetNCoordIndex(aim->mNumFaces); + comp_o3dgc_ifs.SetCoordIndex((IndicesType* const)&b->GetPointer()[idx_srcdata_ind]); + // Prepare to encoding + comp_o3dgc_params.SetNumFloatAttributes(comp_o3dgc_ifs.GetNumFloatAttributes()); + if(mProperties->GetPropertyBool("extensions.Open3DGC.binary", true)) + comp_o3dgc_params.SetStreamType(o3dgc::O3DGC_STREAM_TYPE_BINARY); + else + comp_o3dgc_params.SetStreamType(o3dgc::O3DGC_STREAM_TYPE_ASCII); + + comp_o3dgc_ifs.ComputeMinMax(o3dgc::O3DGC_SC3DMC_MAX_ALL_DIMS); + // + // Encoding + // + encoder.Encode(comp_o3dgc_params, comp_o3dgc_ifs, bs); + // Replace data in buffer. + b->ReplaceData(idx_srcdata_begin, b->byteLength - idx_srcdata_begin, bs.GetBuffer(), bs.GetSize()); + // + // Add information about extension to mesh. + // + // Create extension structure. + Mesh::SCompression_Open3DGC* ext = new Mesh::SCompression_Open3DGC; + + // Fill it. + ext->Buffer = b->id; + ext->Offset = idx_srcdata_begin; + ext->Count = b->byteLength - idx_srcdata_begin; + ext->Binary = mProperties->GetPropertyBool("extensions.Open3DGC.binary"); + ext->IndicesCount = comp_o3dgc_ifs.GetNCoordIndex() * 3; + ext->VerticesCount = comp_o3dgc_ifs.GetNCoord(); + // And assign to mesh. + m->Extension.push_back(ext); +#endif + }// if(comp_allow) + }// for (unsigned int i = 0; i < mScene->mNumMeshes; ++i) + + //---------------------------------------- + // Finish the skin + // Create the Accessor for skinRef->inverseBindMatrices + if (createSkin) { + mat4* invBindMatrixData = new mat4[inverseBindMatricesData.size()]; + for ( unsigned int idx_joint = 0; idx_joint < inverseBindMatricesData.size(); ++idx_joint) { + CopyValue(inverseBindMatricesData[idx_joint], invBindMatrixData[idx_joint]); + } + + Ref<Accessor> invBindMatrixAccessor = ExportData(*mAsset, skinName, b, static_cast<unsigned int>(inverseBindMatricesData.size()), invBindMatrixData, AttribType::MAT4, AttribType::MAT4, ComponentType_FLOAT); + if (invBindMatrixAccessor) skinRef->inverseBindMatrices = invBindMatrixAccessor; + + // Identity Matrix =====> skinRef->bindShapeMatrix + // Temporary. Hard-coded identity matrix here + skinRef->bindShapeMatrix.isPresent = true; + IdentityMatrix4(skinRef->bindShapeMatrix.value); + + // Find node that contains this mesh and add "skeletons" and "skin" attributes to that node. + Ref<Node> rootNode = mAsset->nodes.Get(unsigned(0)); + Ref<Node> meshNode; + std::string meshID = mAsset->meshes.Get(unsigned(0))->id; + FindMeshNode(rootNode, meshNode, meshID); + + Ref<Node> rootJoint = FindSkeletonRootJoint(skinRef); + meshNode->skeletons.push_back(rootJoint); + meshNode->skin = skinRef; + } +} + +#if defined(__has_warning) +#if __has_warning("-Wunused-but-set-variable") +#pragma GCC diagnostic pop +#endif +#endif + +/* + * Export the root node of the node hierarchy. + * Calls ExportNode for all children. + */ +unsigned int glTFExporter::ExportNodeHierarchy(const aiNode* n) +{ + Ref<Node> node = mAsset->nodes.Create(mAsset->FindUniqueID(n->mName.C_Str(), "node")); + + if (!n->mTransformation.IsIdentity()) { + node->matrix.isPresent = true; + CopyValue(n->mTransformation, node->matrix.value); + } + + for (unsigned int i = 0; i < n->mNumMeshes; ++i) { + node->meshes.push_back(mAsset->meshes.Get(n->mMeshes[i])); + } + + for (unsigned int i = 0; i < n->mNumChildren; ++i) { + unsigned int idx = ExportNode(n->mChildren[i], node); + node->children.push_back(mAsset->nodes.Get(idx)); + } + + return node.GetIndex(); +} + +/* + * Export node and recursively calls ExportNode for all children. + * Since these nodes are not the root node, we also export the parent Ref<Node> + */ +unsigned int glTFExporter::ExportNode(const aiNode* n, Ref<Node>& parent) +{ + Ref<Node> node = mAsset->nodes.Create(mAsset->FindUniqueID(n->mName.C_Str(), "node")); + + node->parent = parent; + + if (!n->mTransformation.IsIdentity()) { + node->matrix.isPresent = true; + CopyValue(n->mTransformation, node->matrix.value); + } + + for (unsigned int i = 0; i < n->mNumMeshes; ++i) { + node->meshes.push_back(mAsset->meshes.Get(n->mMeshes[i])); + } + + for (unsigned int i = 0; i < n->mNumChildren; ++i) { + unsigned int idx = ExportNode(n->mChildren[i], node); + node->children.push_back(mAsset->nodes.Get(idx)); + } + + return node.GetIndex(); +} + + +void glTFExporter::ExportScene() +{ + const char* sceneName = "defaultScene"; + Ref<Scene> scene = mAsset->scenes.Create(sceneName); + + // root node will be the first one exported (idx 0) + if (mAsset->nodes.Size() > 0) { + scene->nodes.push_back(mAsset->nodes.Get(0u)); + } + + // set as the default scene + mAsset->scene = scene; +} + +void glTFExporter::ExportMetadata() +{ + glTF::AssetMetadata& asset = mAsset->asset; + asset.version = "1.0"; + + char buffer[256]; + ai_snprintf(buffer, 256, "Open Asset Import Library (assimp v%d.%d.%x)", + aiGetVersionMajor(), aiGetVersionMinor(), aiGetVersionRevision()); + + asset.generator = buffer; + + // Copyright + aiString copyright_str; + if (mScene->mMetaData != nullptr && mScene->mMetaData->Get(AI_METADATA_SOURCE_COPYRIGHT, copyright_str)) { + asset.copyright = copyright_str.C_Str(); + } +} + +inline void ExtractAnimationData(Asset& mAsset, std::string& animId, Ref<Animation>& animRef, Ref<Buffer>& buffer, const aiNodeAnim* nodeChannel, float ticksPerSecond) +{ + // Loop over the data and check to see if it exactly matches an existing buffer. + // If yes, then reference the existing corresponding accessor. + // Otherwise, add to the buffer and create a new accessor. + + size_t counts[3] = { + nodeChannel->mNumPositionKeys, + nodeChannel->mNumScalingKeys, + nodeChannel->mNumRotationKeys, + }; + size_t numKeyframes = 1; + for (int i = 0; i < 3; ++i) { + if (counts[i] > numKeyframes) { + numKeyframes = counts[i]; + } + } + + //------------------------------------------------------- + // Extract TIME parameter data. + // Check if the timeStamps are the same for mPositionKeys, mRotationKeys, and mScalingKeys. + if(nodeChannel->mNumPositionKeys > 0) { + typedef float TimeType; + std::vector<TimeType> timeData; + timeData.resize(numKeyframes); + for (size_t i = 0; i < numKeyframes; ++i) { + size_t frameIndex = i * nodeChannel->mNumPositionKeys / numKeyframes; + // mTime is measured in ticks, but GLTF time is measured in seconds, so convert. + // Check if we have to cast type here. e.g. uint16_t() + timeData[i] = static_cast<float>(nodeChannel->mPositionKeys[frameIndex].mTime / ticksPerSecond); + } + + Ref<Accessor> timeAccessor = ExportData(mAsset, animId, buffer, static_cast<unsigned int>(numKeyframes), &timeData[0], AttribType::SCALAR, AttribType::SCALAR, ComponentType_FLOAT); + if (timeAccessor) animRef->Parameters.TIME = timeAccessor; + } + + //------------------------------------------------------- + // Extract translation parameter data + if(nodeChannel->mNumPositionKeys > 0) { + C_STRUCT aiVector3D* translationData = new aiVector3D[numKeyframes]; + for (size_t i = 0; i < numKeyframes; ++i) { + size_t frameIndex = i * nodeChannel->mNumPositionKeys / numKeyframes; + translationData[i] = nodeChannel->mPositionKeys[frameIndex].mValue; + } + + Ref<Accessor> tranAccessor = ExportData(mAsset, animId, buffer, static_cast<unsigned int>(numKeyframes), translationData, AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT); + if ( tranAccessor ) { + animRef->Parameters.translation = tranAccessor; + } + delete[] translationData; + } + + //------------------------------------------------------- + // Extract scale parameter data + if(nodeChannel->mNumScalingKeys > 0) { + C_STRUCT aiVector3D* scaleData = new aiVector3D[numKeyframes]; + for (size_t i = 0; i < numKeyframes; ++i) { + size_t frameIndex = i * nodeChannel->mNumScalingKeys / numKeyframes; + scaleData[i] = nodeChannel->mScalingKeys[frameIndex].mValue; + } + + Ref<Accessor> scaleAccessor = ExportData(mAsset, animId, buffer, static_cast<unsigned int>(numKeyframes), scaleData, AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT); + if ( scaleAccessor ) { + animRef->Parameters.scale = scaleAccessor; + } + delete[] scaleData; + } + + //------------------------------------------------------- + // Extract rotation parameter data + if(nodeChannel->mNumRotationKeys > 0) { + vec4* rotationData = new vec4[numKeyframes]; + for (size_t i = 0; i < numKeyframes; ++i) { + size_t frameIndex = i * nodeChannel->mNumRotationKeys / numKeyframes; + rotationData[i][0] = nodeChannel->mRotationKeys[frameIndex].mValue.x; + rotationData[i][1] = nodeChannel->mRotationKeys[frameIndex].mValue.y; + rotationData[i][2] = nodeChannel->mRotationKeys[frameIndex].mValue.z; + rotationData[i][3] = nodeChannel->mRotationKeys[frameIndex].mValue.w; + } + + Ref<Accessor> rotAccessor = ExportData(mAsset, animId, buffer, static_cast<unsigned int>(numKeyframes), rotationData, AttribType::VEC4, AttribType::VEC4, ComponentType_FLOAT); + if ( rotAccessor ) { + animRef->Parameters.rotation = rotAccessor; + } + delete[] rotationData; + } +} + +void glTFExporter::ExportAnimations() +{ + Ref<Buffer> bufferRef = mAsset->buffers.Get(unsigned (0)); + + for (unsigned int i = 0; i < mScene->mNumAnimations; ++i) { + const aiAnimation* anim = mScene->mAnimations[i]; + + std::string nameAnim = "anim"; + if (anim->mName.length > 0) { + nameAnim = anim->mName.C_Str(); + } + + for (unsigned int channelIndex = 0; channelIndex < anim->mNumChannels; ++channelIndex) { + const aiNodeAnim* nodeChannel = anim->mChannels[channelIndex]; + + // It appears that assimp stores this type of animation as multiple animations. + // where each aiNodeAnim in mChannels animates a specific node. + std::string name = nameAnim + "_" + ai_to_string(channelIndex); + name = mAsset->FindUniqueID(name, "animation"); + Ref<Animation> animRef = mAsset->animations.Create(name); + + /******************* Parameters ********************/ + ExtractAnimationData(*mAsset, name, animRef, bufferRef, nodeChannel, static_cast<float>(anim->mTicksPerSecond)); + + for (unsigned int j = 0; j < 3; ++j) { + std::string channelType; + int channelSize=0; + switch (j) { + case 0: + channelType = "rotation"; + channelSize = nodeChannel->mNumRotationKeys; + break; + case 1: + channelType = "scale"; + channelSize = nodeChannel->mNumScalingKeys; + break; + case 2: + channelType = "translation"; + channelSize = nodeChannel->mNumPositionKeys; + break; + } + + if (channelSize < 1) { continue; } + + Animation::AnimChannel tmpAnimChannel; + Animation::AnimSampler tmpAnimSampler; + + tmpAnimChannel.sampler = name + "_" + channelType; + tmpAnimChannel.target.path = channelType; + tmpAnimSampler.output = channelType; + tmpAnimSampler.id = name + "_" + channelType; + + tmpAnimChannel.target.id = mAsset->nodes.Get(nodeChannel->mNodeName.C_Str()); + + tmpAnimSampler.input = "TIME"; + tmpAnimSampler.interpolation = "LINEAR"; + + animRef->Channels.push_back(tmpAnimChannel); + animRef->Samplers.push_back(tmpAnimSampler); + } + + } + + // Assimp documentation staes this is not used (not implemented) + // for (unsigned int channelIndex = 0; channelIndex < anim->mNumMeshChannels; ++channelIndex) { + // const aiMeshAnim* meshChannel = anim->mMeshChannels[channelIndex]; + // } + + } // End: for-loop mNumAnimations +} + + +#endif // ASSIMP_BUILD_NO_GLTF_EXPORTER +#endif // ASSIMP_BUILD_NO_EXPORT |