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Diffstat (limited to 'src/3rdparty/assimp/code/glTF2Exporter.cpp')
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diff --git a/src/3rdparty/assimp/code/glTF2Exporter.cpp b/src/3rdparty/assimp/code/glTF2Exporter.cpp new file mode 100644 index 000000000..c1a803c1f --- /dev/null +++ b/src/3rdparty/assimp/code/glTF2Exporter.cpp @@ -0,0 +1,1080 @@ +/* +Open Asset Import Library (assimp) +---------------------------------------------------------------------- + +Copyright (c) 2006-2017, 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 "glTF2Exporter.h" + +#include "Exceptional.h" +#include "StringComparison.h" +#include "ByteSwapper.h" + +#include "SplitLargeMeshes.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 <inttypes.h> + +#include "glTF2AssetWriter.h" + +using namespace rapidjson; + +using namespace Assimp; +using namespace glTF2; + +namespace Assimp { + + // ------------------------------------------------------------------------------------------------ + // Worker function for exporting a scene to GLTF. Prototyped and registered in Exporter.cpp + void ExportSceneGLTF2(const char* pFile, IOSystem* pIOSystem, const aiScene* pScene, const ExportProperties* pProperties) + { + // invoke the exporter + glTF2Exporter exporter(pFile, pIOSystem, pScene, pProperties, false); + } + +} // end of namespace Assimp + +glTF2Exporter::glTF2Exporter(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); + std::unique_ptr<aiScene> sceneCopy(sceneCopy_tmp); + + SplitLargeMeshesProcess_Triangle tri_splitter; + tri_splitter.SetLimit(0xffff); + tri_splitter.Execute(sceneCopy.get()); + + SplitLargeMeshesProcess_Vertex vert_splitter; + vert_splitter.SetLimit(0xffff); + vert_splitter.Execute(sceneCopy.get()); + + mScene = sceneCopy.get(); + + mAsset.reset( new Asset( pIOSystem ) ); + + ExportMetadata(); + + ExportMaterials(); + + if (mScene->mRootNode) { + ExportNodeHierarchy(mScene->mRootNode); + } + + ExportMeshes(); + MergeMeshes(); + + ExportScene(); + + ExportAnimations(); + + AssetWriter writer(*mAsset); + + 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, 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) +{ + o.a1 = v.a1; o.a2 = v.a2; o.a3 = v.a3; o.a4 = v.a4; + o.b1 = v.b1; o.b2 = v.b2; o.b3 = v.b3; o.b4 = v.b4; + o.c1 = v.c1; o.c2 = v.c2; o.c3 = v.c3; o.c4 = v.c4; + o.d1 = v.d1; o.d2 = v.d2; o.d3 = v.d3; o.d4 = v.d4; +} + +static void IdentityMatrix4(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; +} + +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, bool isIndices = false) +{ + 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->byteStride = 0; + bv->target = isIndices ? BufferViewTarget_ELEMENT_ARRAY_BUFFER : BufferViewTarget_ARRAY_BUFFER; + + // accessor + Ref<Accessor> acc = a.accessors.Create(a.FindUniqueID(meshName, "accessor")); + acc->bufferView = bv; + acc->byteOffset = 0; + acc->componentType = compType; + acc->count = count; + acc->type = typeOut; + + // calculate min and max values + { + // Allocate and initialize with large values. + float float_MAX = 10000000000000.0f; + for (unsigned int i = 0 ; i < numCompsOut ; i++) { + acc->min.push_back( float_MAX); + acc->max.push_back(-float_MAX); + } + + // Search and set extreme values. + float valueTmp; + for (unsigned int i = 0 ; i < count ; i++) { + for (unsigned int j = 0 ; j < numCompsOut ; j++) { + if (numCompsOut == 1) { + valueTmp = static_cast<unsigned short*>(data)[i]; + } else { + valueTmp = static_cast<aiVector3D*>(data)[i][j]; + } + + if (valueTmp < acc->min[j]) { + acc->min[j] = valueTmp; + } + if (valueTmp > acc->max[j]) { + acc->max[j] = valueTmp; + } + } + } + } + + // copy the data + acc->WriteData(count, data, numCompsIn*bytesPerComp); + + return acc; +} + +inline void SetSamplerWrap(SamplerWrap& wrap, aiTextureMapMode map) +{ + switch (map) { + case aiTextureMapMode_Clamp: + wrap = SamplerWrap::Clamp_To_Edge; + break; + case aiTextureMapMode_Mirror: + wrap = SamplerWrap::Mirrored_Repeat; + break; + case aiTextureMapMode_Wrap: + case aiTextureMapMode_Decal: + default: + wrap = SamplerWrap::Repeat; + break; + }; +} + +void glTF2Exporter::GetTexSampler(const aiMaterial* mat, Ref<Texture> texture, aiTextureType tt, unsigned int slot) +{ + aiString aId; + std::string id; + if (aiGetMaterialString(mat, AI_MATKEY_GLTF_MAPPINGID(tt, slot), &aId) == AI_SUCCESS) { + id = aId.C_Str(); + } + + if (Ref<Sampler> ref = mAsset->samplers.Get(id.c_str())) { + texture->sampler = ref; + } else { + id = mAsset->FindUniqueID(id, "sampler"); + + texture->sampler = mAsset->samplers.Create(id.c_str()); + + aiTextureMapMode mapU, mapV; + SamplerMagFilter filterMag; + SamplerMinFilter filterMin; + + if (aiGetMaterialInteger(mat, AI_MATKEY_MAPPINGMODE_U(tt, slot), (int*)&mapU) == AI_SUCCESS) { + SetSamplerWrap(texture->sampler->wrapS, mapU); + } + + if (aiGetMaterialInteger(mat, AI_MATKEY_MAPPINGMODE_V(tt, slot), (int*)&mapV) == AI_SUCCESS) { + SetSamplerWrap(texture->sampler->wrapT, mapV); + } + + if (aiGetMaterialInteger(mat, AI_MATKEY_GLTF_MAPPINGFILTER_MAG(tt, slot), (int*)&filterMag) == AI_SUCCESS) { + texture->sampler->magFilter = filterMag; + } + + if (aiGetMaterialInteger(mat, AI_MATKEY_GLTF_MAPPINGFILTER_MIN(tt, slot), (int*)&filterMin) == AI_SUCCESS) { + texture->sampler->minFilter = filterMin; + } + + aiString name; + if (aiGetMaterialString(mat, AI_MATKEY_GLTF_MAPPINGNAME(tt, slot), &name) == AI_SUCCESS) { + texture->sampler->name = name.C_Str(); + } + } +} + +void glTF2Exporter::GetMatTexProp(const aiMaterial* mat, unsigned int& prop, const char* propName, aiTextureType tt, unsigned int slot) +{ + std::string textureKey = std::string(_AI_MATKEY_TEXTURE_BASE) + "." + propName; + + mat->Get(textureKey.c_str(), tt, slot, prop); +} + +void glTF2Exporter::GetMatTexProp(const aiMaterial* mat, float& prop, const char* propName, aiTextureType tt, unsigned int slot) +{ + std::string textureKey = std::string(_AI_MATKEY_TEXTURE_BASE) + "." + propName; + + mat->Get(textureKey.c_str(), tt, slot, prop); +} + +void glTF2Exporter::GetMatTex(const aiMaterial* mat, Ref<Texture>& texture, aiTextureType tt, unsigned int slot = 0) +{ + + if (mat->GetTextureCount(tt) > 0) { + aiString tex; + + if (mat->Get(AI_MATKEY_TEXTURE(tt, slot), 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()) { + texture = mAsset->textures.Get(it->second); + } + } + + if (!texture) { + std::string texId = mAsset->FindUniqueID("", "texture"); + texture = mAsset->textures.Create(texId); + mTexturesByPath[path] = texture.GetIndex(); + + std::string imgId = mAsset->FindUniqueID("", "image"); + texture->source = mAsset->images.Create(imgId); + + if (path[0] == '*') { // embedded + aiTexture* tex = mScene->mTextures[atoi(&path[1])]; + + uint8_t* data = reinterpret_cast<uint8_t*>(tex->pcData); + texture->source->SetData(data, tex->mWidth, *mAsset); + + if (tex->achFormatHint[0]) { + std::string mimeType = "image/"; + mimeType += (memcmp(tex->achFormatHint, "jpg", 3) == 0) ? "jpeg" : tex->achFormatHint; + texture->source->mimeType = mimeType; + } + } + else { + texture->source->uri = path; + } + + GetTexSampler(mat, texture, tt, slot); + } + } + } + } +} + +void glTF2Exporter::GetMatTex(const aiMaterial* mat, TextureInfo& prop, aiTextureType tt, unsigned int slot = 0) +{ + Ref<Texture>& texture = prop.texture; + + GetMatTex(mat, texture, tt, slot); + + if (texture) { + GetMatTexProp(mat, prop.texCoord, "texCoord", tt, slot); + } +} + +void glTF2Exporter::GetMatTex(const aiMaterial* mat, NormalTextureInfo& prop, aiTextureType tt, unsigned int slot = 0) +{ + Ref<Texture>& texture = prop.texture; + + GetMatTex(mat, texture, tt, slot); + + if (texture) { + GetMatTexProp(mat, prop.texCoord, "texCoord", tt, slot); + GetMatTexProp(mat, prop.scale, "scale", tt, slot); + } +} + +void glTF2Exporter::GetMatTex(const aiMaterial* mat, OcclusionTextureInfo& prop, aiTextureType tt, unsigned int slot = 0) +{ + Ref<Texture>& texture = prop.texture; + + GetMatTex(mat, texture, tt, slot); + + if (texture) { + GetMatTexProp(mat, prop.texCoord, "texCoord", tt, slot); + GetMatTexProp(mat, prop.strength, "strength", tt, slot); + } +} + +aiReturn glTF2Exporter::GetMatColor(const aiMaterial* mat, vec4& prop, const char* propName, int type, int idx) +{ + aiColor4D col; + aiReturn result = mat->Get(propName, type, idx, col); + + if (result == AI_SUCCESS) { + prop[0] = col.r; prop[1] = col.g; prop[2] = col.b; prop[3] = col.a; + } + + return result; +} + +aiReturn glTF2Exporter::GetMatColor(const aiMaterial* mat, vec3& prop, const char* propName, int type, int idx) +{ + aiColor3D col; + aiReturn result = mat->Get(propName, type, idx, col); + + if (result == AI_SUCCESS) { + prop[0] = col.r; prop[1] = col.g; prop[2] = col.b; + } + + return result; +} + +void glTF2Exporter::ExportMaterials() +{ + aiString aiName; + for (unsigned int i = 0; i < mScene->mNumMaterials; ++i) { + const aiMaterial* mat = mScene->mMaterials[i]; + + std::string id = "material_" + to_string(i); + + Ref<Material> m = mAsset->materials.Create(id); + + std::string name; + if (mat->Get(AI_MATKEY_NAME, aiName) == AI_SUCCESS) { + name = aiName.C_Str(); + } + name = mAsset->FindUniqueID(name, "material"); + + m->name = name; + + GetMatTex(mat, m->pbrMetallicRoughness.baseColorTexture, AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_BASE_COLOR_TEXTURE); + + if (!m->pbrMetallicRoughness.baseColorTexture.texture) { + //if there wasn't a baseColorTexture defined in the source, fallback to any diffuse texture + GetMatTex(mat, m->pbrMetallicRoughness.baseColorTexture, aiTextureType_DIFFUSE); + } + + GetMatTex(mat, m->pbrMetallicRoughness.metallicRoughnessTexture, AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_METALLICROUGHNESS_TEXTURE); + + if (GetMatColor(mat, m->pbrMetallicRoughness.baseColorFactor, AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_BASE_COLOR_FACTOR) != AI_SUCCESS) { + // if baseColorFactor wasn't defined, then the source is likely not a metallic roughness material. + //a fallback to any diffuse color should be used instead + GetMatColor(mat, m->pbrMetallicRoughness.baseColorFactor, AI_MATKEY_COLOR_DIFFUSE); + } + + if (mat->Get(AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_METALLIC_FACTOR, m->pbrMetallicRoughness.metallicFactor) != AI_SUCCESS) { + //if metallicFactor wasn't defined, then the source is likely not a PBR file, and the metallicFactor should be 0 + m->pbrMetallicRoughness.metallicFactor = 0; + } + + // get roughness if source is gltf2 file + if (mat->Get(AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_ROUGHNESS_FACTOR, m->pbrMetallicRoughness.roughnessFactor) != AI_SUCCESS) { + // otherwise, try to derive and convert from specular + shininess values + aiColor4D specularColor; + ai_real shininess; + + if ( + mat->Get(AI_MATKEY_COLOR_SPECULAR, specularColor) == AI_SUCCESS && + mat->Get(AI_MATKEY_SHININESS, shininess) == AI_SUCCESS + ) { + // convert specular color to luminance + float specularIntensity = specularColor[0] * 0.2125f + specularColor[1] * 0.7154f + specularColor[2] * 0.0721f; + //normalize shininess (assuming max is 1000) with an inverse exponentional curve + float normalizedShininess = std::sqrt(shininess / 1000); + + //clamp the shininess value between 0 and 1 + normalizedShininess = std::min(std::max(normalizedShininess, 0.0f), 1.0f); + // low specular intensity values should produce a rough material even if shininess is high. + normalizedShininess = normalizedShininess * specularIntensity; + + m->pbrMetallicRoughness.roughnessFactor = 1 - normalizedShininess; + } + } + + GetMatTex(mat, m->normalTexture, aiTextureType_NORMALS); + GetMatTex(mat, m->occlusionTexture, aiTextureType_LIGHTMAP); + GetMatTex(mat, m->emissiveTexture, aiTextureType_EMISSIVE); + GetMatColor(mat, m->emissiveFactor, AI_MATKEY_COLOR_EMISSIVE); + + mat->Get(AI_MATKEY_TWOSIDED, m->doubleSided); + mat->Get(AI_MATKEY_GLTF_ALPHACUTOFF, m->alphaCutoff); + + aiString alphaMode; + + if (mat->Get(AI_MATKEY_GLTF_ALPHAMODE, alphaMode) == AI_SUCCESS) { + m->alphaMode = alphaMode.C_Str(); + } else { + float opacity; + + if (mat->Get(AI_MATKEY_OPACITY, opacity) == AI_SUCCESS) { + if (opacity < 1) { + m->alphaMode = "BLEND"; + m->pbrMetallicRoughness.baseColorFactor[3] *= opacity; + } + } + } + + bool hasPbrSpecularGlossiness = false; + mat->Get(AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS, hasPbrSpecularGlossiness); + + if (hasPbrSpecularGlossiness) { + + if (!mAsset->extensionsUsed.KHR_materials_pbrSpecularGlossiness) { + mAsset->extensionsUsed.KHR_materials_pbrSpecularGlossiness = true; + } + + PbrSpecularGlossiness pbrSG; + + GetMatColor(mat, pbrSG.diffuseFactor, AI_MATKEY_COLOR_DIFFUSE); + GetMatColor(mat, pbrSG.specularFactor, AI_MATKEY_COLOR_SPECULAR); + + if (mat->Get(AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS_GLOSSINESS_FACTOR, pbrSG.glossinessFactor) != AI_SUCCESS) { + float shininess; + + if (mat->Get(AI_MATKEY_SHININESS, shininess)) { + pbrSG.glossinessFactor = shininess / 1000; + } + } + + GetMatTex(mat, pbrSG.diffuseTexture, aiTextureType_DIFFUSE); + GetMatTex(mat, pbrSG.specularGlossinessTexture, aiTextureType_SPECULAR); + + m->pbrSpecularGlossiness = Nullable<PbrSpecularGlossiness>(pbrSG); + } + } +} + +/* + * 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, 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->name; + + 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; +} + +void glTF2Exporter::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; + + 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]; + + std::string name = aim->mName.C_Str(); + + std::string meshId = mAsset->FindUniqueID(name, "mesh"); + Ref<Mesh> m = mAsset->meshes.Create(meshId); + m->primitives.resize(1); + Mesh::Primitive& p = m->primitives.back(); + + m->name = name; + + p.material = mAsset->materials.Get(aim->mMaterialIndex); + + /******************* Vertices ********************/ + Ref<Accessor> v = ExportData(*mAsset, meshId, b, aim->mNumVertices, aim->mVertices, AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT); + if (v) p.attributes.position.push_back(v); + + /******************** Normals ********************/ + Ref<Accessor> n = ExportData(*mAsset, meshId, b, aim->mNumVertices, aim->mNormals, AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT); + 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; + + Ref<Accessor> tc = ExportData(*mAsset, meshId, b, aim->mNumVertices, aim->mTextureCoords[i], AttribType::VEC3, type, ComponentType_FLOAT, false); + if (tc) p.attributes.texcoord.push_back(tc); + } + } + + /*************** Vertices indices ****************/ + 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, true); + } + + 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); + } + } + + //---------------------------------------- + // 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 nodes that contain a mesh with bones and add "skeletons" and "skin" attributes to those nodes. + Ref<Node> rootNode = mAsset->nodes.Get(unsigned(0)); + Ref<Node> meshNode; + for (unsigned int meshIndex = 0; meshIndex < mAsset->meshes.Size(); ++meshIndex) { + Ref<Mesh> mesh = mAsset->meshes.Get(meshIndex); + bool hasBones = false; + for (unsigned int i = 0; i < mesh->primitives.size(); ++i) { + if (!mesh->primitives[i].attributes.weight.empty()) { + hasBones = true; + break; + } + } + if (!hasBones) { + continue; + } + std::string meshID = mesh->id; + FindMeshNode(rootNode, meshNode, meshID); + Ref<Node> rootJoint = FindSkeletonRootJoint(skinRef); + meshNode->skeletons.push_back(rootJoint); + meshNode->skin = skinRef; + } + } +} + +//merges a node's multiple meshes (with one primitive each) into one mesh with multiple primitives +void glTF2Exporter::MergeMeshes() +{ + for (unsigned int n = 0; n < mAsset->nodes.Size(); ++n) { + Ref<Node> node = mAsset->nodes.Get(n); + + unsigned int nMeshes = static_cast<unsigned int>(node->meshes.size()); + + //skip if it's 1 or less meshes per node + if (nMeshes > 1) { + Ref<Mesh> firstMesh = node->meshes.at(0); + + //loop backwards to allow easy removal of a mesh from a node once it's merged + for (unsigned int m = nMeshes - 1; m >= 1; --m) { + Ref<Mesh> mesh = node->meshes.at(m); + + //append this mesh's primitives to the first mesh's primitives + firstMesh->primitives.insert( + firstMesh->primitives.end(), + mesh->primitives.begin(), + mesh->primitives.end() + ); + + //remove the mesh from the list of meshes + unsigned int removedIndex = mAsset->meshes.Remove(mesh->id.c_str()); + + //find the presence of the removed mesh in other nodes + for (unsigned int nn = 0; nn < mAsset->nodes.Size(); ++nn) { + Ref<Node> node = mAsset->nodes.Get(nn); + + for (unsigned int mm = 0; mm < node->meshes.size(); ++mm) { + Ref<Mesh>& meshRef = node->meshes.at(mm); + unsigned int meshIndex = meshRef.GetIndex(); + + if (meshIndex == removedIndex) { + node->meshes.erase(node->meshes.begin() + mm); + } else if (meshIndex > removedIndex) { + Ref<Mesh> newMeshRef = mAsset->meshes.Get(meshIndex - 1); + + meshRef = newMeshRef; + } + } + } + } + + //since we were looping backwards, reverse the order of merged primitives to their original order + std::reverse(firstMesh->primitives.begin() + 1, firstMesh->primitives.end()); + } + } +} + +/* + * Export the root node of the node hierarchy. + * Calls ExportNode for all children. + */ +unsigned int glTF2Exporter::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 glTF2Exporter::ExportNode(const aiNode* n, Ref<Node>& parent) +{ + std::string name = mAsset->FindUniqueID(n->mName.C_Str(), "node"); + Ref<Node> node = mAsset->nodes.Create(name); + + node->parent = parent; + node->name = name; + + 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 glTF2Exporter::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 glTF2Exporter::ExportMetadata() +{ + AssetMetadata& asset = mAsset->asset; + asset.version = "2.0"; + + char buffer[256]; + ai_snprintf(buffer, 256, "Open Asset Import Library (assimp v%d.%d.%d)", + aiGetVersionMajor(), aiGetVersionMinor(), aiGetVersionRevision()); + + asset.generator = buffer; +} + +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 glTF2Exporter::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 + "_" + 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; + 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 = static_cast<int>(animRef->Samplers.size()); + tmpAnimChannel.target.path = channelType; + tmpAnimSampler.output = channelType; + tmpAnimSampler.id = name + "_" + channelType; + + tmpAnimChannel.target.node = 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 |