dali-scene3d/internal/loader/gltf2-util.cpp

   1 /*
   2  * Copyright (c) 2023 Samsung Electronics Co., Ltd.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  *
  16  */
  17
  18 // CLASS HEADER
  19 #include <dali-scene3d/internal/loader/gltf2-util.h>
  20
  21 // EXTERNAL INCLUDES
  22 #include <dali/devel-api/threading/mutex.h>
  23 #include <dali/integration-api/debug.h>
  24
  25 using namespace Dali::Scene3D::Loader;
  26
  27 namespace Dali::Scene3D::Loader::Internal
  28 {
  29 namespace Gltf2Util
  30 {
  31 static constexpr std::string_view MRENDERER_MODEL_IDENTIFICATION = "M-Renderer";
  32 static constexpr std::string_view POSITION_PROPERTY              = "position";
  33 static constexpr std::string_view ORIENTATION_PROPERTY           = "orientation";
  34 static constexpr std::string_view SCALE_PROPERTY                 = "scale";
  35 static constexpr std::string_view BLEND_SHAPE_WEIGHTS_UNIFORM    = "uBlendShapeWeight";
  36 static constexpr std::string_view ROOT_NODE_NAME                 = "RootNode";
  37 static const Vector3              SCALE_TO_ADJUST(100.0f, 100.0f, 100.0f);
  38
  39 static const Geometry::Type GLTF2_TO_DALI_PRIMITIVES[]{
  40   Geometry::POINTS,
  41   Geometry::LINES,
  42   Geometry::LINE_LOOP,
  43   Geometry::LINE_STRIP,
  44   Geometry::TRIANGLES,
  45   Geometry::TRIANGLE_STRIP,
  46   Geometry::TRIANGLE_FAN}; //...because Dali swaps the last two.
  47
  48 static struct AttributeMapping
  49 {
  50   gltf2::Attribute::Type   mType;
  51   MeshDefinition::Accessor MeshDefinition::*mAccessor;
  52   uint16_t                                  mElementSizeRequired;
  53 } ATTRIBUTE_MAPPINGS[]{
  54   {gltf2::Attribute::NORMAL, &MeshDefinition::mNormals, sizeof(Vector3)},
  55   {gltf2::Attribute::TANGENT, &MeshDefinition::mTangents, sizeof(Vector3)},
  56   {gltf2::Attribute::TEXCOORD_0, &MeshDefinition::mTexCoords, sizeof(Vector2)},
  57   {gltf2::Attribute::COLOR_0, &MeshDefinition::mColors, sizeof(Vector4)},
  58   {gltf2::Attribute::JOINTS_0, &MeshDefinition::mJoints0, sizeof(Vector4)},
  59   {gltf2::Attribute::WEIGHTS_0, &MeshDefinition::mWeights0, sizeof(Vector4)},
  60 };
  61
  62 std::vector<gltf2::Animation> ReadAnimationArray(const json_value_s& j)
  63 {
  64   auto results = json::Read::Array<gltf2::Animation, json::ObjectReader<gltf2::Animation>::Read>(j);
  65
  66   for(auto& animation : results)
  67   {
  68     for(auto& channel : animation.mChannels)
  69     {
  70       channel.mSampler.UpdateVector(animation.mSamplers);
  71     }
  72   }
  73
  74   return results;
  75 }
  76
  77 void ApplyAccessorMinMax(const gltf2::Accessor& accessor, float* values)
  78 {
  79   DALI_ASSERT_ALWAYS(accessor.mMax.empty() || gltf2::AccessorType::ElementCount(accessor.mType) == accessor.mMax.size());
  80   DALI_ASSERT_ALWAYS(accessor.mMin.empty() || gltf2::AccessorType::ElementCount(accessor.mType) == accessor.mMin.size());
  81   MeshDefinition::Blob::ApplyMinMax(accessor.mMin, accessor.mMax, accessor.mCount, values);
  82 }
  83
  84 const json::Reader<gltf2::Buffer>& GetBufferReader()
  85 {
  86   static const auto BUFFER_READER = std::move(json::Reader<gltf2::Buffer>()
  87                                                 .Register(*json::MakeProperty("byteLength", json::Read::Number<uint32_t>, &gltf2::Buffer::mByteLength))
  88                                                 .Register(*json::MakeProperty("uri", json::Read::StringView, &gltf2::Buffer::mUri)));
  89   return BUFFER_READER;
  90 }
  91
  92 const json::Reader<gltf2::BufferView>& GetBufferViewReader()
  93 {
  94   static const auto BUFFER_VIEW_READER = std::move(json::Reader<gltf2::BufferView>()
  95                                                      .Register(*json::MakeProperty("buffer", gltf2::RefReader<gltf2::Document>::Read<gltf2::Buffer, &gltf2::Document::mBuffers>, &gltf2::BufferView::mBuffer))
  96                                                      .Register(*json::MakeProperty("byteOffset", json::Read::Number<uint32_t>, &gltf2::BufferView::mByteOffset))
  97                                                      .Register(*json::MakeProperty("byteLength", json::Read::Number<uint32_t>, &gltf2::BufferView::mByteLength))
  98                                                      .Register(*json::MakeProperty("byteStride", json::Read::Number<uint32_t>, &gltf2::BufferView::mByteStride))
  99                                                      .Register(*json::MakeProperty("target", json::Read::Number<uint32_t>, &gltf2::BufferView::mTarget)));
 100   return BUFFER_VIEW_READER;
 101 }
 102
 103 const json::Reader<gltf2::BufferViewClient>& GetBufferViewClientReader()
 104 {
 105   static const auto BUFFER_VIEW_CLIENT_READER = std::move(json::Reader<gltf2::BufferViewClient>()
 106                                                             .Register(*json::MakeProperty("bufferView", gltf2::RefReader<gltf2::Document>::Read<gltf2::BufferView, &gltf2::Document::mBufferViews>, &gltf2::BufferViewClient::mBufferView))
 107                                                             .Register(*json::MakeProperty("byteOffset", json::Read::Number<uint32_t>, &gltf2::BufferViewClient::mByteOffset)));
 108   return BUFFER_VIEW_CLIENT_READER;
 109 }
 110
 111 const json::Reader<gltf2::ComponentTypedBufferViewClient>& GetComponentTypedBufferViewClientReader()
 112 {
 113   static const auto COMPONENT_TYPED_BUFFER_VIEW_CLIENT_READER = std::move(json::Reader<gltf2::ComponentTypedBufferViewClient>()
 114                                                                             .Register(*new json::Property<gltf2::ComponentTypedBufferViewClient, gltf2::Ref<gltf2::BufferView>>("bufferView", gltf2::RefReader<gltf2::Document>::Read<gltf2::BufferView, &gltf2::Document::mBufferViews>, &gltf2::ComponentTypedBufferViewClient::mBufferView))
 115                                                                             .Register(*new json::Property<gltf2::ComponentTypedBufferViewClient, uint32_t>("byteOffset", json::Read::Number<uint32_t>, &gltf2::ComponentTypedBufferViewClient::mByteOffset))
 116                                                                             .Register(*json::MakeProperty("componentType", json::Read::Enum<gltf2::Component::Type>, &gltf2::ComponentTypedBufferViewClient::mComponentType)));
 117   return COMPONENT_TYPED_BUFFER_VIEW_CLIENT_READER;
 118 }
 119
 120 const json::Reader<gltf2::Accessor::Sparse>& GetAccessorSparseReader()
 121 {
 122   static const auto ACCESSOR_SPARSE_READER = std::move(json::Reader<gltf2::Accessor::Sparse>()
 123                                                          .Register(*json::MakeProperty("count", json::Read::Number<uint32_t>, &gltf2::Accessor::Sparse::mCount))
 124                                                          .Register(*json::MakeProperty("indices", json::ObjectReader<gltf2::ComponentTypedBufferViewClient>::Read, &gltf2::Accessor::Sparse::mIndices))
 125                                                          .Register(*json::MakeProperty("values", json::ObjectReader<gltf2::BufferViewClient>::Read, &gltf2::Accessor::Sparse::mValues)));
 126   return ACCESSOR_SPARSE_READER;
 127 }
 128
 129 const json::Reader<gltf2::Accessor>& GetAccessorReader()
 130 {
 131   static const auto ACCESSOR_READER = std::move(json::Reader<gltf2::Accessor>()
 132                                                   .Register(*new json::Property<gltf2::Accessor, gltf2::Ref<gltf2::BufferView>>("bufferView",
 133                                                                                                                                 gltf2::RefReader<gltf2::Document>::Read<gltf2::BufferView, &gltf2::Document::mBufferViews>,
 134                                                                                                                                 &gltf2::Accessor::mBufferView))
 135                                                   .Register(*new json::Property<gltf2::Accessor, uint32_t>("byteOffset",
 136                                                                                                            json::Read::Number<uint32_t>,
 137                                                                                                            &gltf2::Accessor::mByteOffset))
 138                                                   .Register(*new json::Property<gltf2::Accessor, gltf2::Component::Type>("componentType",
 139                                                                                                                          json::Read::Enum<gltf2::Component::Type>,
 140                                                                                                                          &gltf2::Accessor::mComponentType))
 141                                                   .Register(*new json::Property<gltf2::Accessor, std::string_view>("name", json::Read::StringView, &gltf2::Accessor::mName))
 142                                                   .Register(*json::MakeProperty("count", json::Read::Number<uint32_t>, &gltf2::Accessor::mCount))
 143                                                   .Register(*json::MakeProperty("normalized", json::Read::Boolean, &gltf2::Accessor::mNormalized))
 144                                                   .Register(*json::MakeProperty("type", gltf2::ReadStringEnum<gltf2::AccessorType>, &gltf2::Accessor::mType))
 145                                                   .Register(*json::MakeProperty("min", json::Read::Array<float, json::Read::Number>, &gltf2::Accessor::mMin))
 146                                                   .Register(*json::MakeProperty("max", json::Read::Array<float, json::Read::Number>, &gltf2::Accessor::mMax))
 147                                                   .Register(*new json::Property<gltf2::Accessor, gltf2::Accessor::Sparse>("sparse", json::ObjectReader<gltf2::Accessor::Sparse>::Read, &gltf2::Accessor::SetSparse)));
 148   return ACCESSOR_READER;
 149 }
 150
 151 const json::Reader<gltf2::Image>& GetImageReader()
 152 {
 153   static const auto IMAGE_READER = std::move(json::Reader<gltf2::Image>()
 154                                                .Register(*new json::Property<gltf2::Image, std::string_view>("name", json::Read::StringView, &gltf2::Material::mName))
 155                                                .Register(*json::MakeProperty("uri", json::Read::StringView, &gltf2::Image::mUri))
 156                                                .Register(*json::MakeProperty("mimeType", json::Read::StringView, &gltf2::Image::mMimeType))
 157                                                .Register(*json::MakeProperty("bufferView", gltf2::RefReader<gltf2::Document>::Read<gltf2::BufferView, &gltf2::Document::mBufferViews>, &gltf2::Image::mBufferView)));
 158   return IMAGE_READER;
 159 }
 160
 161 const json::Reader<gltf2::Sampler>& GetSamplerReader()
 162 {
 163   static const auto SAMPLER_READER = std::move(json::Reader<gltf2::Sampler>()
 164                                                  .Register(*json::MakeProperty("minFilter", json::Read::Enum<gltf2::Filter::Type>, &gltf2::Sampler::mMinFilter))
 165                                                  .Register(*json::MakeProperty("magFilter", json::Read::Enum<gltf2::Filter::Type>, &gltf2::Sampler::mMagFilter))
 166                                                  .Register(*json::MakeProperty("wrapS", json::Read::Enum<gltf2::Wrap::Type>, &gltf2::Sampler::mWrapS))
 167                                                  .Register(*json::MakeProperty("wrapT", json::Read::Enum<gltf2::Wrap::Type>, &gltf2::Sampler::mWrapT)));
 168   return SAMPLER_READER;
 169 }
 170
 171 const json::Reader<gltf2::Texture>& GetTextureReader()
 172 {
 173   static const auto TEXURE_READER = std::move(json::Reader<gltf2::Texture>()
 174                                                 .Register(*json::MakeProperty("source", gltf2::RefReader<gltf2::Document>::Read<gltf2::Image, &gltf2::Document::mImages>, &gltf2::Texture::mSource))
 175                                                 .Register(*json::MakeProperty("sampler", gltf2::RefReader<gltf2::Document>::Read<gltf2::Sampler, &gltf2::Document::mSamplers>, &gltf2::Texture::mSampler)));
 176   return TEXURE_READER;
 177 }
 178
 179 const json::Reader<gltf2::TextureInfo>& GetTextureInfoReader()
 180 {
 181   static const auto TEXURE_INFO_READER = std::move(json::Reader<gltf2::TextureInfo>()
 182                                                      .Register(*json::MakeProperty("index", gltf2::RefReader<gltf2::Document>::Read<gltf2::Texture, &gltf2::Document::mTextures>, &gltf2::TextureInfo::mTexture))
 183                                                      .Register(*json::MakeProperty("texCoord", json::Read::Number<uint32_t>, &gltf2::TextureInfo::mTexCoord))
 184                                                      .Register(*json::MakeProperty("scale", json::Read::Number<float>, &gltf2::TextureInfo::mScale))
 185                                                      .Register(*json::MakeProperty("strength", json::Read::Number<float>, &gltf2::TextureInfo::mStrength)));
 186   return TEXURE_INFO_READER;
 187 }
 188
 189 const json::Reader<gltf2::Material::Pbr>& GetMaterialPbrReader()
 190 {
 191   static const auto MATERIAL_PBR_READER = std::move(json::Reader<gltf2::Material::Pbr>()
 192                                                       .Register(*json::MakeProperty("baseColorFactor", gltf2::ReadDaliVector<Vector4>, &gltf2::Material::Pbr::mBaseColorFactor))
 193                                                       .Register(*json::MakeProperty("baseColorTexture", json::ObjectReader<gltf2::TextureInfo>::Read, &gltf2::Material::Pbr::mBaseColorTexture))
 194                                                       .Register(*json::MakeProperty("metallicFactor", json::Read::Number<float>, &gltf2::Material::Pbr::mMetallicFactor))
 195                                                       .Register(*json::MakeProperty("roughnessFactor", json::Read::Number<float>, &gltf2::Material::Pbr::mRoughnessFactor))
 196                                                       .Register(*json::MakeProperty("metallicRoughnessTexture", json::ObjectReader<gltf2::TextureInfo>::Read, &gltf2::Material::Pbr::mMetallicRoughnessTexture)));
 197   return MATERIAL_PBR_READER;
 198 }
 199
 200 const json::Reader<gltf2::MaterialSpecular>& GetMaterialSpecularReader()
 201 {
 202   static const auto MATERIAL_SPECULAR_READER = std::move(json::Reader<gltf2::MaterialSpecular>()
 203                                                            .Register(*json::MakeProperty("specularFactor", json::Read::Number<float>, &gltf2::MaterialSpecular::mSpecularFactor))
 204                                                            .Register(*json::MakeProperty("specularTexture", json::ObjectReader<gltf2::TextureInfo>::Read, &gltf2::MaterialSpecular::mSpecularTexture))
 205                                                            .Register(*json::MakeProperty("specularColorFactor", gltf2::ReadDaliVector<Vector3>, &gltf2::MaterialSpecular::mSpecularColorFactor))
 206                                                            .Register(*json::MakeProperty("specularColorTexture", json::ObjectReader<gltf2::TextureInfo>::Read, &gltf2::MaterialSpecular::mSpecularColorTexture)));
 207   return MATERIAL_SPECULAR_READER;
 208 }
 209
 210 const json::Reader<gltf2::MaterialIor>& GetMaterialIorReader()
 211 {
 212   static const auto MATERIAL_IOR_READER = std::move(json::Reader<gltf2::MaterialIor>()
 213                                                       .Register(*json::MakeProperty("ior", json::Read::Number<float>, &gltf2::MaterialIor::mIor)));
 214   return MATERIAL_IOR_READER;
 215 }
 216
 217 const json::Reader<gltf2::MaterialExtensions>& GetMaterialExtensionsReader()
 218 {
 219   static const auto MATERIAL_EXTENSION_READER = std::move(json::Reader<gltf2::MaterialExtensions>()
 220                                                             .Register(*json::MakeProperty("KHR_materials_ior", json::ObjectReader<gltf2::MaterialIor>::Read, &gltf2::MaterialExtensions::mMaterialIor))
 221                                                             .Register(*json::MakeProperty("KHR_materials_specular", json::ObjectReader<gltf2::MaterialSpecular>::Read, &gltf2::MaterialExtensions::mMaterialSpecular)));
 222   return MATERIAL_EXTENSION_READER;
 223 }
 224
 225 const json::Reader<gltf2::Material>& GetMaterialReader()
 226 {
 227   static const auto MATERIAL_READER = std::move(json::Reader<gltf2::Material>()
 228                                                   .Register(*new json::Property<gltf2::Material, std::string_view>("name", json::Read::StringView, &gltf2::Material::mName))
 229                                                   .Register(*json::MakeProperty("pbrMetallicRoughness", json::ObjectReader<gltf2::Material::Pbr>::Read, &gltf2::Material::mPbrMetallicRoughness))
 230                                                   .Register(*json::MakeProperty("normalTexture", json::ObjectReader<gltf2::TextureInfo>::Read, &gltf2::Material::mNormalTexture))
 231                                                   .Register(*json::MakeProperty("occlusionTexture", json::ObjectReader<gltf2::TextureInfo>::Read, &gltf2::Material::mOcclusionTexture))
 232                                                   .Register(*json::MakeProperty("emissiveTexture", json::ObjectReader<gltf2::TextureInfo>::Read, &gltf2::Material::mEmissiveTexture))
 233                                                   .Register(*json::MakeProperty("emissiveFactor", gltf2::ReadDaliVector<Vector3>, &gltf2::Material::mEmissiveFactor))
 234                                                   .Register(*json::MakeProperty("alphaMode", gltf2::ReadStringEnum<gltf2::AlphaMode>, &gltf2::Material::mAlphaMode))
 235                                                   .Register(*json::MakeProperty("alphaCutoff", json::Read::Number<float>, &gltf2::Material::mAlphaCutoff))
 236                                                   .Register(*json::MakeProperty("doubleSided", json::Read::Boolean, &gltf2::Material::mDoubleSided))
 237                                                   .Register(*json::MakeProperty("extensions", json::ObjectReader<gltf2::MaterialExtensions>::Read, &gltf2::Material::mMaterialExtensions)));
 238   return MATERIAL_READER;
 239 }
 240
 241 std::map<gltf2::Attribute::Type, gltf2::Ref<gltf2::Accessor>> ReadMeshPrimitiveAttributes(const json_value_s& j)
 242 {
 243   auto&                                                         jsonObject = json::Cast<json_object_s>(j);
 244   std::map<gltf2::Attribute::Type, gltf2::Ref<gltf2::Accessor>> result;
 245
 246   auto element = jsonObject.start;
 247   while(element)
 248   {
 249     auto jsonString                                                                 = *element->name;
 250     result[gltf2::Attribute::FromString(jsonString.string, jsonString.string_size)] = gltf2::RefReader<gltf2::Document>::Read<gltf2::Accessor, &gltf2::Document::mAccessors>(*element->value);
 251     element                                                                         = element->next;
 252   }
 253   return result;
 254 }
 255
 256 std::vector<std::map<gltf2::Attribute::Type, gltf2::Ref<gltf2::Accessor>>> ReadMeshPrimitiveTargets(const json_value_s& j)
 257 {
 258   auto&                                                                      jsonObject = json::Cast<json_array_s>(j);
 259   std::vector<std::map<gltf2::Attribute::Type, gltf2::Ref<gltf2::Accessor>>> result;
 260
 261   result.reserve(jsonObject.length);
 262
 263   auto element = jsonObject.start;
 264   while(element)
 265   {
 266     result.push_back(std::move(ReadMeshPrimitiveAttributes(*element->value)));
 267     element = element->next;
 268   }
 269
 270   return result;
 271 }
 272
 273 const json::Reader<gltf2::Mesh::Primitive>& GetMeshPrimitiveReader()
 274 {
 275   static const auto MESH_PRIMITIVE_READER = std::move(json::Reader<gltf2::Mesh::Primitive>()
 276                                                         .Register(*json::MakeProperty("attributes", ReadMeshPrimitiveAttributes, &gltf2::Mesh::Primitive::mAttributes))
 277                                                         .Register(*json::MakeProperty("indices", gltf2::RefReader<gltf2::Document>::Read<gltf2::Accessor, &gltf2::Document::mAccessors>, &gltf2::Mesh::Primitive::mIndices))
 278                                                         .Register(*json::MakeProperty("material", gltf2::RefReader<gltf2::Document>::Read<gltf2::Material, &gltf2::Document::mMaterials>, &gltf2::Mesh::Primitive::mMaterial))
 279                                                         .Register(*json::MakeProperty("mode", json::Read::Enum<gltf2::Mesh::Primitive::Mode>, &gltf2::Mesh::Primitive::mMode))
 280                                                         .Register(*json::MakeProperty("targets", ReadMeshPrimitiveTargets, &gltf2::Mesh::Primitive::mTargets)));
 281   return MESH_PRIMITIVE_READER;
 282 }
 283
 284 const json::Reader<gltf2::Mesh>& GetMeshReader()
 285 {
 286   static const auto MESH_READER = std::move(json::Reader<gltf2::Mesh>()
 287                                               .Register(*new json::Property<gltf2::Mesh, std::string_view>("name", json::Read::StringView, &gltf2::Mesh::mName))
 288                                               .Register(*json::MakeProperty("primitives",
 289                                                                             json::Read::Array<gltf2::Mesh::Primitive, json::ObjectReader<gltf2::Mesh::Primitive>::Read>,
 290                                                                             &gltf2::Mesh::mPrimitives))
 291                                               .Register(*json::MakeProperty("weights", json::Read::Array<float, json::Read::Number>, &gltf2::Mesh::mWeights)));
 292   return MESH_READER;
 293 }
 294
 295 const json::Reader<gltf2::Skin>& GetSkinReader()
 296 {
 297   static const auto SKIN_READER = std::move(json::Reader<gltf2::Skin>()
 298                                               .Register(*new json::Property<gltf2::Skin, std::string_view>("name", json::Read::StringView, &gltf2::Skin::mName))
 299                                               .Register(*json::MakeProperty("inverseBindMatrices",
 300                                                                             gltf2::RefReader<gltf2::Document>::Read<gltf2::Accessor, &gltf2::Document::mAccessors>,
 301                                                                             &gltf2::Skin::mInverseBindMatrices))
 302                                               .Register(*json::MakeProperty("skeleton",
 303                                                                             gltf2::RefReader<gltf2::Document>::Read<gltf2::Node, &gltf2::Document::mNodes>,
 304                                                                             &gltf2::Skin::mSkeleton))
 305                                               .Register(*json::MakeProperty("joints",
 306                                                                             json::Read::Array<gltf2::Ref<gltf2::Node>, gltf2::RefReader<gltf2::Document>::Read<gltf2::Node, &gltf2::Document::mNodes>>,
 307                                                                             &gltf2::Skin::mJoints)));
 308   return SKIN_READER;
 309 }
 310
 311 const json::Reader<gltf2::Camera::Perspective>& GetCameraPerspectiveReader()
 312 {
 313   static const auto CAMERA_PERSPECTIVE_READER = std::move(json::Reader<gltf2::Camera::Perspective>()
 314                                                             .Register(*json::MakeProperty("aspectRatio", json::Read::Number<float>, &gltf2::Camera::Perspective::mAspectRatio))
 315                                                             .Register(*json::MakeProperty("yfov", json::Read::Number<float>, &gltf2::Camera::Perspective::mYFov))
 316                                                             .Register(*json::MakeProperty("zfar", json::Read::Number<float>, &gltf2::Camera::Perspective::mZFar))
 317                                                             .Register(*json::MakeProperty("znear", json::Read::Number<float>, &gltf2::Camera::Perspective::mZNear))); // TODO: infinite perspective projection, where znear is omitted
 318   return CAMERA_PERSPECTIVE_READER;
 319 }
 320
 321 const json::Reader<gltf2::Camera::Orthographic>& GetCameraOrthographicReader()
 322 {
 323   static const auto CAMERA_ORTHOGRAPHIC_READER = std::move(json::Reader<gltf2::Camera::Orthographic>()
 324                                                              .Register(*json::MakeProperty("xmag", json::Read::Number<float>, &gltf2::Camera::Orthographic::mXMag))
 325                                                              .Register(*json::MakeProperty("ymag", json::Read::Number<float>, &gltf2::Camera::Orthographic::mYMag))
 326                                                              .Register(*json::MakeProperty("zfar", json::Read::Number<float>, &gltf2::Camera::Orthographic::mZFar))
 327                                                              .Register(*json::MakeProperty("znear", json::Read::Number<float>, &gltf2::Camera::Orthographic::mZNear)));
 328   return CAMERA_ORTHOGRAPHIC_READER;
 329 }
 330
 331 const json::Reader<gltf2::Camera>& GetCameraReader()
 332 {
 333   static const auto CAMERA_READER = std::move(json::Reader<gltf2::Camera>()
 334                                                 .Register(*new json::Property<gltf2::Camera, std::string_view>("name", json::Read::StringView, &gltf2::Camera::mName))
 335                                                 .Register(*json::MakeProperty("type", json::Read::StringView, &gltf2::Camera::mType))
 336                                                 .Register(*json::MakeProperty("perspective", json::ObjectReader<gltf2::Camera::Perspective>::Read, &gltf2::Camera::mPerspective))
 337                                                 .Register(*json::MakeProperty("orthographic", json::ObjectReader<gltf2::Camera::Orthographic>::Read, &gltf2::Camera::mOrthographic)));
 338   return CAMERA_READER;
 339 }
 340
 341 const json::Reader<gltf2::Node>& GetNodeReader()
 342 {
 343   static const auto NODE_READER = std::move(json::Reader<gltf2::Node>()
 344                                               .Register(*new json::Property<gltf2::Node, std::string_view>("name", json::Read::StringView, &gltf2::Node::mName))
 345                                               .Register(*json::MakeProperty("translation", gltf2::ReadDaliVector<Vector3>, &gltf2::Node::mTranslation))
 346                                               .Register(*json::MakeProperty("rotation", gltf2::ReadQuaternion, &gltf2::Node::mRotation))
 347                                               .Register(*json::MakeProperty("scale", gltf2::ReadDaliVector<Vector3>, &gltf2::Node::mScale))
 348                                               .Register(*new json::Property<gltf2::Node, Matrix>("matrix", gltf2::ReadDaliVector<Matrix>, &gltf2::Node::SetMatrix))
 349                                               .Register(*json::MakeProperty("camera", gltf2::RefReader<gltf2::Document>::Read<gltf2::Camera, &gltf2::Document::mCameras>, &gltf2::Node::mCamera))
 350                                               .Register(*json::MakeProperty("children", json::Read::Array<gltf2::Ref<gltf2::Node>, gltf2::RefReader<gltf2::Document>::Read<gltf2::Node, &gltf2::Document::mNodes>>, &gltf2::Node::mChildren))
 351                                               .Register(*json::MakeProperty("mesh", gltf2::RefReader<gltf2::Document>::Read<gltf2::Mesh, &gltf2::Document::mMeshes>, &gltf2::Node::mMesh))
 352                                               .Register(*json::MakeProperty("skin", gltf2::RefReader<gltf2::Document>::Read<gltf2::Skin, &gltf2::Document::mSkins>, &gltf2::Node::mSkin)));
 353   return NODE_READER;
 354 }
 355
 356 const json::Reader<gltf2::Animation::Sampler>& GetAnimationSamplerReader()
 357 {
 358   static const auto ANIMATION_SAMPLER_READER = std::move(json::Reader<gltf2::Animation::Sampler>()
 359                                                            .Register(*json::MakeProperty("input", gltf2::RefReader<gltf2::Document>::Read<gltf2::Accessor, &gltf2::Document::mAccessors>, &gltf2::Animation::Sampler::mInput))
 360                                                            .Register(*json::MakeProperty("output", gltf2::RefReader<gltf2::Document>::Read<gltf2::Accessor, &gltf2::Document::mAccessors>, &gltf2::Animation::Sampler::mOutput))
 361                                                            .Register(*json::MakeProperty("interpolation", gltf2::ReadStringEnum<gltf2::Animation::Sampler::Interpolation>, &gltf2::Animation::Sampler::mInterpolation)));
 362   return ANIMATION_SAMPLER_READER;
 363 }
 364
 365 const json::Reader<gltf2::Animation::Channel::Target>& GetAnimationChannelTargetReader()
 366 {
 367   static const auto ANIMATION_TARGET_READER = std::move(json::Reader<gltf2::Animation::Channel::Target>()
 368                                                           .Register(*json::MakeProperty("node", gltf2::RefReader<gltf2::Document>::Read<gltf2::Node, &gltf2::Document::mNodes>, &gltf2::Animation::Channel::Target::mNode))
 369                                                           .Register(*json::MakeProperty("path", gltf2::ReadStringEnum<gltf2::Animation::Channel::Target>, &gltf2::Animation::Channel::Target::mPath)));
 370   return ANIMATION_TARGET_READER;
 371 }
 372
 373 const json::Reader<gltf2::Animation::Channel>& GetAnimationChannelReader()
 374 {
 375   static const auto ANIMATION_CHANNEL_READER = std::move(json::Reader<gltf2::Animation::Channel>()
 376                                                            .Register(*json::MakeProperty("target", json::ObjectReader<gltf2::Animation::Channel::Target>::Read, &gltf2::Animation::Channel::mTarget))
 377                                                            .Register(*json::MakeProperty("sampler", gltf2::RefReader<gltf2::Animation>::Read<gltf2::Animation::Sampler, &gltf2::Animation::mSamplers>, &gltf2::Animation::Channel::mSampler)));
 378   return ANIMATION_CHANNEL_READER;
 379 }
 380
 381 const json::Reader<gltf2::Animation>& GetAnimationReader()
 382 {
 383   static const auto ANIMATION_READER = std::move(json::Reader<gltf2::Animation>()
 384                                                    .Register(*new json::Property<gltf2::Animation, std::string_view>("name", json::Read::StringView, &gltf2::Animation::mName))
 385                                                    .Register(*json::MakeProperty("samplers",
 386                                                                                  json::Read::Array<gltf2::Animation::Sampler, json::ObjectReader<gltf2::Animation::Sampler>::Read>,
 387                                                                                  &gltf2::Animation::mSamplers))
 388                                                    .Register(*json::MakeProperty("channels",
 389                                                                                  json::Read::Array<gltf2::Animation::Channel, json::ObjectReader<gltf2::Animation::Channel>::Read>,
 390                                                                                  &gltf2::Animation::mChannels)));
 391   return ANIMATION_READER;
 392 }
 393
 394 const json::Reader<gltf2::Scene>& GetSceneReader()
 395 {
 396   static const auto SCENE_READER = std::move(json::Reader<gltf2::Scene>()
 397                                                .Register(*new json::Property<gltf2::Scene, std::string_view>("name", json::Read::StringView, &gltf2::Scene::mName))
 398                                                .Register(*json::MakeProperty("nodes",
 399                                                                              json::Read::Array<gltf2::Ref<gltf2::Node>, gltf2::RefReader<gltf2::Document>::Read<gltf2::Node, &gltf2::Document::mNodes>>,
 400                                                                              &gltf2::Scene::mNodes)));
 401   return SCENE_READER;
 402 }
 403
 404 const json::Reader<gltf2::Document>& GetDocumentReader()
 405 {
 406   static const auto DOCUMENT_READER = std::move(json::Reader<gltf2::Document>()
 407                                                   .Register(*json::MakeProperty("buffers",
 408                                                                                 json::Read::Array<gltf2::Buffer, json::ObjectReader<gltf2::Buffer>::Read>,
 409                                                                                 &gltf2::Document::mBuffers))
 410                                                   .Register(*json::MakeProperty("bufferViews",
 411                                                                                 json::Read::Array<gltf2::BufferView, json::ObjectReader<gltf2::BufferView>::Read>,
 412                                                                                 &gltf2::Document::mBufferViews))
 413                                                   .Register(*json::MakeProperty("accessors",
 414                                                                                 json::Read::Array<gltf2::Accessor, json::ObjectReader<gltf2::Accessor>::Read>,
 415                                                                                 &gltf2::Document::mAccessors))
 416                                                   .Register(*json::MakeProperty("images",
 417                                                                                 json::Read::Array<gltf2::Image, json::ObjectReader<gltf2::Image>::Read>,
 418                                                                                 &gltf2::Document::mImages))
 419                                                   .Register(*json::MakeProperty("samplers",
 420                                                                                 json::Read::Array<gltf2::Sampler, json::ObjectReader<gltf2::Sampler>::Read>,
 421                                                                                 &gltf2::Document::mSamplers))
 422                                                   .Register(*json::MakeProperty("textures",
 423                                                                                 json::Read::Array<gltf2::Texture, json::ObjectReader<gltf2::Texture>::Read>,
 424                                                                                 &gltf2::Document::mTextures))
 425                                                   .Register(*json::MakeProperty("materials",
 426                                                                                 json::Read::Array<gltf2::Material, json::ObjectReader<gltf2::Material>::Read>,
 427                                                                                 &gltf2::Document::mMaterials))
 428                                                   .Register(*json::MakeProperty("meshes",
 429                                                                                 json::Read::Array<gltf2::Mesh, json::ObjectReader<gltf2::Mesh>::Read>,
 430                                                                                 &gltf2::Document::mMeshes))
 431                                                   .Register(*json::MakeProperty("skins",
 432                                                                                 json::Read::Array<gltf2::Skin, json::ObjectReader<gltf2::Skin>::Read>,
 433                                                                                 &gltf2::Document::mSkins))
 434                                                   .Register(*json::MakeProperty("cameras",
 435                                                                                 json::Read::Array<gltf2::Camera, json::ObjectReader<gltf2::Camera>::Read>,
 436                                                                                 &gltf2::Document::mCameras))
 437                                                   .Register(*json::MakeProperty("nodes",
 438                                                                                 json::Read::Array<gltf2::Node, json::ObjectReader<gltf2::Node>::Read>,
 439                                                                                 &gltf2::Document::mNodes))
 440                                                   .Register(*json::MakeProperty("animations",
 441                                                                                 ReadAnimationArray,
 442                                                                                 &gltf2::Document::mAnimations))
 443                                                   .Register(*json::MakeProperty("scenes",
 444                                                                                 json::Read::Array<gltf2::Scene, json::ObjectReader<gltf2::Scene>::Read>,
 445                                                                                 &gltf2::Document::mScenes))
 446                                                   .Register(*json::MakeProperty("scene", gltf2::RefReader<gltf2::Document>::Read<gltf2::Scene, &gltf2::Document::mScenes>, &gltf2::Document::mScene)));
 447   return DOCUMENT_READER;
 448 }
 449
 450 void ConvertBuffer(const gltf2::Buffer& buffer, decltype(ResourceBundle::mBuffers)& outBuffers, const std::string& resourcePath)
 451 {
 452   BufferDefinition bufferDefinition;
 453
 454   bufferDefinition.mResourcePath = resourcePath;
 455   bufferDefinition.mUri          = buffer.mUri;
 456   bufferDefinition.mByteLength   = buffer.mByteLength;
 457
 458   outBuffers.emplace_back(std::move(bufferDefinition));
 459 }
 460
 461 void ConvertBuffers(const gltf2::Document& document, ConversionContext& context)
 462 {
 463   auto& outBuffers = context.mOutput.mResources.mBuffers;
 464   outBuffers.reserve(document.mBuffers.size());
 465
 466   for(auto& buffer : document.mBuffers)
 467   {
 468     if(buffer.mUri.empty())
 469     {
 470       continue;
 471     }
 472     ConvertBuffer(buffer, outBuffers, context.mPath);
 473   }
 474 }
 475
 476 SamplerFlags::Type ConvertWrapMode(gltf2::Wrap::Type wrapMode)
 477 {
 478   switch(wrapMode)
 479   {
 480     case gltf2::Wrap::REPEAT:
 481       return SamplerFlags::WRAP_REPEAT;
 482     case gltf2::Wrap::CLAMP_TO_EDGE:
 483       return SamplerFlags::WRAP_CLAMP;
 484     case gltf2::Wrap::MIRRORED_REPEAT:
 485       return SamplerFlags::WRAP_MIRROR;
 486     default:
 487       throw std::runtime_error("Invalid wrap type.");
 488   }
 489 }
 490
 491 SamplerFlags::Type ConvertSampler(const gltf2::Ref<gltf2::Sampler>& sampler)
 492 {
 493   if(sampler)
 494   {
 495     return ((sampler->mMinFilter < gltf2::Filter::NEAREST_MIPMAP_NEAREST) ? (sampler->mMinFilter - gltf2::Filter::NEAREST) : ((sampler->mMinFilter - gltf2::Filter::NEAREST_MIPMAP_NEAREST) + 2)) |
 496            ((sampler->mMagFilter - gltf2::Filter::NEAREST) << SamplerFlags::FILTER_MAG_SHIFT) |
 497            (ConvertWrapMode(sampler->mWrapS) << SamplerFlags::WRAP_S_SHIFT) |
 498            (ConvertWrapMode(sampler->mWrapT) << SamplerFlags::WRAP_T_SHIFT);
 499   }
 500   else
 501   {
 502     // https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#texturesampler
 503     // "The index of the sampler used by this texture. When undefined, a sampler with repeat wrapping and auto filtering should be used."
 504     // "What is an auto filtering", I hear you ask. Since there's nothing else to determine mipmapping from - including glTF image
 505     // properties, if not in some extension -, we will simply assume linear filtering.
 506     return SamplerFlags::FILTER_LINEAR | (SamplerFlags::FILTER_LINEAR << SamplerFlags::FILTER_MAG_SHIFT) |
 507            (SamplerFlags::WRAP_REPEAT << SamplerFlags::WRAP_S_SHIFT) | (SamplerFlags::WRAP_REPEAT << SamplerFlags::WRAP_T_SHIFT);
 508   }
 509 }
 510
 511 TextureDefinition ConvertTextureInfo(const gltf2::TextureInfo& textureInfo, ConversionContext& context, const ImageMetadata& metaData = ImageMetadata())
 512 {
 513   TextureDefinition textureDefinition;
 514   std::string       uri = std::string(textureInfo.mTexture->mSource->mUri);
 515   if(uri.empty())
 516   {
 517     uint32_t bufferIndex = textureInfo.mTexture->mSource->mBufferView->mBuffer.GetIndex();
 518     if(bufferIndex != INVALID_INDEX && context.mOutput.mResources.mBuffers[bufferIndex].IsAvailable())
 519     {
 520       auto& stream = context.mOutput.mResources.mBuffers[bufferIndex].GetBufferStream();
 521       stream.clear();
 522       stream.seekg(textureInfo.mTexture->mSource->mBufferView->mByteOffset, stream.beg);
 523       std::vector<uint8_t> dataBuffer;
 524       dataBuffer.resize(textureInfo.mTexture->mSource->mBufferView->mByteLength);
 525       stream.read(reinterpret_cast<char*>(dataBuffer.data()), static_cast<std::streamsize>(static_cast<size_t>(textureInfo.mTexture->mSource->mBufferView->mByteLength)));
 526       return TextureDefinition{std::move(dataBuffer), ConvertSampler(textureInfo.mTexture->mSampler), metaData.mMinSize, metaData.mSamplingMode};
 527     }
 528     return TextureDefinition();
 529   }
 530   else
 531   {
 532     return TextureDefinition{uri, ConvertSampler(textureInfo.mTexture->mSampler), metaData.mMinSize, metaData.mSamplingMode};
 533   }
 534 }
 535
 536 void AddTextureStage(uint32_t semantic, MaterialDefinition& materialDefinition, gltf2::TextureInfo textureInfo, const Dali::Scene3D::Loader::ImageMetadata& metaData, ConversionContext& context)
 537 {
 538   materialDefinition.mTextureStages.push_back({semantic, ConvertTextureInfo(textureInfo, context, metaData)});
 539   materialDefinition.mFlags |= semantic;
 540 }
 541
 542 void ConvertMaterial(const gltf2::Material& material, const std::unordered_map<std::string, ImageMetadata>& imageMetaData, decltype(ResourceBundle::mMaterials)& outMaterials, ConversionContext& context)
 543 {
 544   auto getTextureMetaData = [](const std::unordered_map<std::string, ImageMetadata>& metaData, const gltf2::TextureInfo& info)
 545   {
 546     if(!info.mTexture->mSource->mUri.empty())
 547     {
 548       if(auto search = metaData.find(info.mTexture->mSource->mUri.data()); search != metaData.end())
 549       {
 550         return search->second;
 551       }
 552     }
 553     return ImageMetadata();
 554   };
 555
 556   MaterialDefinition materialDefinition;
 557
 558   auto& pbr = material.mPbrMetallicRoughness;
 559   if(material.mAlphaMode == gltf2::AlphaMode::BLEND)
 560   {
 561     materialDefinition.mAlphaModeType = Scene3D::Material::AlphaModeType::BLEND;
 562     materialDefinition.mIsOpaque      = false;
 563     materialDefinition.mFlags |= MaterialDefinition::TRANSPARENCY;
 564   }
 565   else if(material.mAlphaMode == gltf2::AlphaMode::MASK)
 566   {
 567     materialDefinition.mAlphaModeType = Scene3D::Material::AlphaModeType::MASK;
 568     materialDefinition.mIsMask        = true;
 569     materialDefinition.SetAlphaCutoff(std::min(1.f, std::max(0.f, material.mAlphaCutoff)));
 570   }
 571
 572   materialDefinition.mBaseColorFactor = pbr.mBaseColorFactor;
 573
 574   materialDefinition.mTextureStages.reserve(!!pbr.mBaseColorTexture + !!pbr.mMetallicRoughnessTexture + !!material.mNormalTexture + !!material.mOcclusionTexture + !!material.mEmissiveTexture);
 575   if(pbr.mBaseColorTexture)
 576   {
 577     AddTextureStage(MaterialDefinition::ALBEDO, materialDefinition, pbr.mBaseColorTexture, getTextureMetaData(imageMetaData, pbr.mBaseColorTexture), context);
 578   }
 579   else
 580   {
 581     materialDefinition.mNeedAlbedoTexture = false;
 582   }
 583
 584   materialDefinition.mMetallic  = pbr.mMetallicFactor;
 585   materialDefinition.mRoughness = pbr.mRoughnessFactor;
 586
 587   if(pbr.mMetallicRoughnessTexture)
 588   {
 589     AddTextureStage(MaterialDefinition::METALLIC | MaterialDefinition::ROUGHNESS | MaterialDefinition::GLTF_CHANNELS,
 590                     materialDefinition,
 591                     pbr.mMetallicRoughnessTexture,
 592                     getTextureMetaData(imageMetaData, pbr.mMetallicRoughnessTexture),
 593                     context);
 594   }
 595   else
 596   {
 597     materialDefinition.mNeedMetallicRoughnessTexture = false;
 598   }
 599
 600   materialDefinition.mNormalScale = material.mNormalTexture.mScale;
 601   if(material.mNormalTexture)
 602   {
 603     AddTextureStage(MaterialDefinition::NORMAL, materialDefinition, material.mNormalTexture, getTextureMetaData(imageMetaData, material.mNormalTexture), context);
 604   }
 605   else
 606   {
 607     materialDefinition.mNeedNormalTexture = false;
 608   }
 609
 610   if(material.mOcclusionTexture)
 611   {
 612     AddTextureStage(MaterialDefinition::OCCLUSION, materialDefinition, material.mOcclusionTexture, getTextureMetaData(imageMetaData, material.mOcclusionTexture), context);
 613     materialDefinition.mOcclusionStrength = material.mOcclusionTexture.mStrength;
 614   }
 615
 616   materialDefinition.mEmissiveFactor = material.mEmissiveFactor;
 617   if(material.mEmissiveTexture)
 618   {
 619     AddTextureStage(MaterialDefinition::EMISSIVE, materialDefinition, material.mEmissiveTexture, getTextureMetaData(imageMetaData, material.mEmissiveTexture), context);
 620   }
 621
 622   if(!Dali::Equals(material.mMaterialExtensions.mMaterialIor.mIor, gltf2::UNDEFINED_FLOAT_VALUE))
 623   {
 624     materialDefinition.mIor                = material.mMaterialExtensions.mMaterialIor.mIor;
 625     materialDefinition.mDielectricSpecular = powf((materialDefinition.mIor - 1.0f) / (materialDefinition.mIor + 1.0f), 2.0f);
 626   }
 627   materialDefinition.mSpecularFactor      = material.mMaterialExtensions.mMaterialSpecular.mSpecularFactor;
 628   materialDefinition.mSpecularColorFactor = material.mMaterialExtensions.mMaterialSpecular.mSpecularColorFactor;
 629
 630   if(material.mMaterialExtensions.mMaterialSpecular.mSpecularTexture)
 631   {
 632     AddTextureStage(MaterialDefinition::SPECULAR, materialDefinition, material.mMaterialExtensions.mMaterialSpecular.mSpecularTexture, getTextureMetaData(imageMetaData, material.mMaterialExtensions.mMaterialSpecular.mSpecularTexture), context);
 633   }
 634
 635   if(material.mMaterialExtensions.mMaterialSpecular.mSpecularColorTexture)
 636   {
 637     AddTextureStage(MaterialDefinition::SPECULAR_COLOR, materialDefinition, material.mMaterialExtensions.mMaterialSpecular.mSpecularColorTexture, getTextureMetaData(imageMetaData, material.mMaterialExtensions.mMaterialSpecular.mSpecularColorTexture), context);
 638   }
 639
 640   materialDefinition.mDoubleSided = material.mDoubleSided;
 641
 642   outMaterials.emplace_back(std::move(materialDefinition), TextureSet());
 643 }
 644
 645 void ConvertMaterials(const gltf2::Document& document, ConversionContext& context)
 646 {
 647   auto& imageMetaData = context.mOutput.mSceneMetadata.mImageMetadata;
 648
 649   auto& outMaterials = context.mOutput.mResources.mMaterials;
 650   outMaterials.reserve(document.mMaterials.size());
 651
 652   for(auto& material : document.mMaterials)
 653   {
 654     ConvertMaterial(material, imageMetaData, outMaterials, context);
 655   }
 656 }
 657
 658 MeshDefinition::Accessor ConvertMeshPrimitiveAccessor(const gltf2::Accessor& accessor)
 659 {
 660   DALI_ASSERT_ALWAYS((accessor.mBufferView &&
 661                       (accessor.mBufferView->mByteStride < std::numeric_limits<uint16_t>::max())) ||
 662                      (accessor.mSparse && !accessor.mBufferView));
 663
 664   DALI_ASSERT_ALWAYS(!accessor.mSparse ||
 665                      ((accessor.mSparse->mIndices.mBufferView && (accessor.mSparse->mIndices.mBufferView->mByteStride < std::numeric_limits<uint16_t>::max())) &&
 666                       (accessor.mSparse->mValues.mBufferView && (accessor.mSparse->mValues.mBufferView->mByteStride < std::numeric_limits<uint16_t>::max()))));
 667
 668   MeshDefinition::SparseBlob sparseBlob;
 669   if(accessor.mSparse)
 670   {
 671     const gltf2::Accessor::Sparse&               sparse  = *accessor.mSparse;
 672     const gltf2::ComponentTypedBufferViewClient& indices = sparse.mIndices;
 673     const gltf2::BufferViewClient&               values  = sparse.mValues;
 674
 675     MeshDefinition::Blob indicesBlob(
 676       indices.mBufferView->mByteOffset + indices.mByteOffset,
 677       sparse.mCount * indices.GetBytesPerComponent(),
 678       static_cast<uint16_t>(indices.mBufferView->mByteStride),
 679       static_cast<uint16_t>(indices.GetBytesPerComponent()),
 680       {},
 681       {});
 682     MeshDefinition::Blob valuesBlob(
 683       values.mBufferView->mByteOffset + values.mByteOffset,
 684       sparse.mCount * accessor.GetElementSizeBytes(),
 685       static_cast<uint16_t>(values.mBufferView->mByteStride),
 686       static_cast<uint16_t>(accessor.GetElementSizeBytes()),
 687       {},
 688       {});
 689
 690     sparseBlob = std::move(MeshDefinition::SparseBlob(std::move(indicesBlob), std::move(valuesBlob), accessor.mSparse->mCount));
 691   }
 692
 693   uint32_t bufferViewOffset = 0u;
 694   uint32_t bufferViewStride = 0u;
 695   if(accessor.mBufferView)
 696   {
 697     bufferViewOffset = accessor.mBufferView->mByteOffset;
 698     bufferViewStride = accessor.mBufferView->mByteStride;
 699   }
 700
 701   return MeshDefinition::Accessor{
 702     std::move(MeshDefinition::Blob{bufferViewOffset + accessor.mByteOffset,
 703                                    accessor.GetBytesLength(),
 704                                    static_cast<uint16_t>(bufferViewStride),
 705                                    static_cast<uint16_t>(accessor.GetElementSizeBytes()),
 706                                    accessor.mMin,
 707                                    accessor.mMax}),
 708     std::move(sparseBlob),
 709     accessor.mBufferView ? accessor.mBufferView->mBuffer.GetIndex() : 0};
 710 }
 711
 712 void ConvertMeshes(const gltf2::Document& document, ConversionContext& context)
 713 {
 714   uint32_t meshCount = 0;
 715   context.mMeshIds.reserve(document.mMeshes.size());
 716   for(auto& mesh : document.mMeshes)
 717   {
 718     context.mMeshIds.push_back(meshCount);
 719     meshCount += mesh.mPrimitives.size();
 720   }
 721
 722   auto& outMeshes = context.mOutput.mResources.mMeshes;
 723   outMeshes.reserve(meshCount);
 724   for(auto& mesh : document.mMeshes)
 725   {
 726     for(auto& primitive : mesh.mPrimitives)
 727     {
 728       MeshDefinition meshDefinition;
 729
 730       auto& attribs                 = primitive.mAttributes;
 731       meshDefinition.mPrimitiveType = GLTF2_TO_DALI_PRIMITIVES[primitive.mMode];
 732
 733       auto positionIter = attribs.find(gltf2::Attribute::POSITION);
 734
 735       if(positionIter == attribs.end())
 736       {
 737         DALI_LOG_ERROR("Primitive mesh dosn't have POSITION atrributes!");
 738         continue;
 739       }
 740
 741       auto& accPositions        = *positionIter->second;
 742       meshDefinition.mPositions = ConvertMeshPrimitiveAccessor(accPositions);
 743       // glTF2 support vector4 tangent for mesh.
 744       // https://www.khronos.org/registry/glTF/specs/2.0/glTF-2.0.html#meshes-overview
 745       meshDefinition.mTangentType = Property::VECTOR4;
 746
 747       const bool needNormalsTangents = accPositions.mType == gltf2::AccessorType::VEC3;
 748       for(auto& attributeMapping : ATTRIBUTE_MAPPINGS)
 749       {
 750         auto iFind = attribs.find(attributeMapping.mType);
 751         if(iFind != attribs.end())
 752         {
 753           auto& accessor = meshDefinition.*(attributeMapping.mAccessor);
 754           accessor       = ConvertMeshPrimitiveAccessor(*iFind->second);
 755
 756           if(iFind->first == gltf2::Attribute::JOINTS_0)
 757           {
 758             meshDefinition.mFlags |= (iFind->second->mComponentType == gltf2::Component::UNSIGNED_SHORT) * MeshDefinition::U16_JOINT_IDS;
 759             meshDefinition.mFlags |= (iFind->second->mComponentType == gltf2::Component::UNSIGNED_BYTE) * MeshDefinition::U8_JOINT_IDS;
 760             DALI_ASSERT_DEBUG(MaskMatch(meshDefinition.mFlags, MeshDefinition::U16_JOINT_IDS) || MaskMatch(meshDefinition.mFlags, MeshDefinition::U8_JOINT_IDS) || iFind->second->mComponentType == gltf2::Component::FLOAT);
 761           }
 762         }
 763         else if(needNormalsTangents)
 764         {
 765           switch(attributeMapping.mType)
 766           {
 767             case gltf2::Attribute::NORMAL:
 768               meshDefinition.RequestNormals();
 769               break;
 770
 771             case gltf2::Attribute::TANGENT:
 772               meshDefinition.RequestTangents();
 773               break;
 774
 775             default:
 776               break;
 777           }
 778         }
 779       }
 780
 781       if(primitive.mIndices)
 782       {
 783         meshDefinition.mIndices = ConvertMeshPrimitiveAccessor(*primitive.mIndices);
 784         meshDefinition.mFlags |= (primitive.mIndices->mComponentType == gltf2::Component::UNSIGNED_INT) * MeshDefinition::U32_INDICES;
 785         meshDefinition.mFlags |= (primitive.mIndices->mComponentType == gltf2::Component::UNSIGNED_BYTE) * MeshDefinition::U8_INDICES;
 786         DALI_ASSERT_DEBUG(MaskMatch(meshDefinition.mFlags, MeshDefinition::U32_INDICES) || MaskMatch(meshDefinition.mFlags, MeshDefinition::U8_INDICES) || primitive.mIndices->mComponentType == gltf2::Component::UNSIGNED_SHORT);
 787       }
 788
 789       if(!primitive.mTargets.empty())
 790       {
 791         meshDefinition.mBlendShapes.reserve(primitive.mTargets.size());
 792         meshDefinition.mBlendShapeVersion = BlendShapes::Version::VERSION_2_0;
 793         for(const auto& target : primitive.mTargets)
 794         {
 795           MeshDefinition::BlendShape blendShape;
 796
 797           auto endIt = target.end();
 798           auto it    = target.find(gltf2::Attribute::POSITION);
 799           if(it != endIt)
 800           {
 801             blendShape.deltas = ConvertMeshPrimitiveAccessor(*it->second);
 802           }
 803           it = target.find(gltf2::Attribute::NORMAL);
 804           if(it != endIt)
 805           {
 806             blendShape.normals = ConvertMeshPrimitiveAccessor(*it->second);
 807           }
 808           it = target.find(gltf2::Attribute::TANGENT);
 809           if(it != endIt)
 810           {
 811             blendShape.tangents = ConvertMeshPrimitiveAccessor(*it->second);
 812           }
 813
 814           if(!mesh.mWeights.empty())
 815           {
 816             blendShape.weight = mesh.mWeights[meshDefinition.mBlendShapes.size()];
 817           }
 818
 819           meshDefinition.mBlendShapes.push_back(std::move(blendShape));
 820         }
 821       }
 822
 823       outMeshes.push_back({std::move(meshDefinition), MeshGeometry{}});
 824     }
 825   }
 826 }
 827
 828 ModelRenderable* MakeModelRenderable(const gltf2::Mesh::Primitive& primitive, ConversionContext& context)
 829 {
 830   auto modelRenderable = new ModelRenderable();
 831
 832   modelRenderable->mShaderIdx = 0; // TODO: further thought
 833
 834   auto materialIdx = primitive.mMaterial.GetIndex();
 835   if(INVALID_INDEX == materialIdx)
 836   {
 837     // https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#default-material
 838     if(INVALID_INDEX == context.mDefaultMaterial)
 839     {
 840       auto& outMaterials       = context.mOutput.mResources.mMaterials;
 841       context.mDefaultMaterial = outMaterials.size();
 842
 843       ConvertMaterial(gltf2::Material{}, context.mOutput.mSceneMetadata.mImageMetadata, outMaterials, context);
 844     }
 845
 846     materialIdx = context.mDefaultMaterial;
 847   }
 848
 849   modelRenderable->mMaterialIdx = materialIdx;
 850
 851   return modelRenderable;
 852 }
 853
 854 void ConvertCamera(const gltf2::Camera& camera, CameraParameters& cameraParameters)
 855 {
 856   cameraParameters.isPerspective = camera.mType.compare("perspective") == 0;
 857   if(cameraParameters.isPerspective)
 858   {
 859     auto& perspective = camera.mPerspective;
 860     if(!Dali::Equals(perspective.mYFov, gltf2::UNDEFINED_FLOAT_VALUE))
 861     {
 862       cameraParameters.yFovDegree = Degree(Radian(perspective.mYFov));
 863     }
 864     else
 865     {
 866       cameraParameters.yFovDegree = Degree(gltf2::UNDEFINED_FLOAT_VALUE);
 867     }
 868     cameraParameters.zNear = perspective.mZNear;
 869     cameraParameters.zFar  = perspective.mZFar;
 870     // TODO: yes, we seem to ignore aspectRatio in CameraParameters.
 871   }
 872   else
 873   {
 874     auto& ortho = camera.mOrthographic;
 875     if(!Dali::Equals(ortho.mYMag, gltf2::UNDEFINED_FLOAT_VALUE) && !Dali::Equals(ortho.mXMag, gltf2::UNDEFINED_FLOAT_VALUE))
 876     {
 877       cameraParameters.orthographicSize = ortho.mYMag * .5f;
 878       cameraParameters.aspectRatio      = ortho.mXMag / ortho.mYMag;
 879     }
 880     else
 881     {
 882       cameraParameters.orthographicSize = gltf2::UNDEFINED_FLOAT_VALUE;
 883       cameraParameters.aspectRatio      = gltf2::UNDEFINED_FLOAT_VALUE;
 884     }
 885     cameraParameters.zNear = ortho.mZNear;
 886     cameraParameters.zFar  = ortho.mZFar;
 887   }
 888 }
 889
 890 void ConvertNode(gltf2::Node const& node, const Index gltfIndex, Index parentIndex, ConversionContext& context, bool isMRendererModel)
 891 {
 892   auto& output    = context.mOutput;
 893   auto& scene     = output.mScene;
 894   auto& resources = output.mResources;
 895
 896   const auto index    = scene.GetNodeCount();
 897   auto       weakNode = scene.AddNode([&]()
 898                                 {
 899     std::unique_ptr<NodeDefinition> nodeDefinition{new NodeDefinition()};
 900
 901     nodeDefinition->mParentIdx = parentIndex;
 902     nodeDefinition->mName      = node.mName;
 903     if(nodeDefinition->mName.empty())
 904     {
 905       // TODO: Production quality generation of unique names.
 906       nodeDefinition->mName = std::to_string(reinterpret_cast<uintptr_t>(nodeDefinition.get()));
 907     }
 908
 909     if(!node.mSkin) // Nodes with skinned meshes are not supposed to have local transforms.
 910     {
 911       nodeDefinition->mPosition    = node.mTranslation;
 912       nodeDefinition->mOrientation = node.mRotation;
 913       nodeDefinition->mScale       = node.mScale;
 914
 915       if(isMRendererModel && node.mName == ROOT_NODE_NAME && node.mScale == SCALE_TO_ADJUST)
 916       {
 917         nodeDefinition->mScale *= 0.01f;
 918       }
 919     }
 920
 921     return nodeDefinition; }());
 922   if(!weakNode)
 923   {
 924     ExceptionFlinger(ASSERT_LOCATION) << "Node name '" << node.mName << "' is not unique; scene is invalid.";
 925   }
 926
 927   context.mNodeIndices.RegisterMapping(gltfIndex, index);
 928
 929   Index skeletonIdx = node.mSkin ? node.mSkin.GetIndex() : INVALID_INDEX;
 930   if(node.mMesh)
 931   {
 932     auto&    mesh           = *node.mMesh;
 933     uint32_t primitiveCount = mesh.mPrimitives.size();
 934     auto     meshIndex      = context.mMeshIds[node.mMesh.GetIndex()];
 935     weakNode->mRenderables.reserve(primitiveCount);
 936     for(uint32_t i = 0; i < primitiveCount; ++i)
 937     {
 938       std::unique_ptr<NodeDefinition::Renderable> renderable;
 939       auto                                        modelRenderable = MakeModelRenderable(mesh.mPrimitives[i], context);
 940       modelRenderable->mMeshIdx                                   = meshIndex + i;
 941
 942       DALI_ASSERT_DEBUG(resources.mMeshes[modelRenderable->mMeshIdx].first.mSkeletonIdx == INVALID_INDEX ||
 943                         resources.mMeshes[modelRenderable->mMeshIdx].first.mSkeletonIdx == skeletonIdx);
 944       resources.mMeshes[modelRenderable->mMeshIdx].first.mSkeletonIdx = skeletonIdx;
 945
 946       renderable.reset(modelRenderable);
 947       weakNode->mRenderables.push_back(std::move(renderable));
 948     }
 949   }
 950
 951   if(node.mCamera)
 952   {
 953     CameraParameters cameraParameters;
 954     ConvertCamera(*node.mCamera, cameraParameters);
 955
 956     cameraParameters.matrix.SetTransformComponents(node.mScale, node.mRotation, node.mTranslation);
 957     output.mCameraParameters.push_back(cameraParameters);
 958   }
 959
 960   for(auto& child : node.mChildren)
 961   {
 962     ConvertNode(*child, child.GetIndex(), index, context, isMRendererModel);
 963   }
 964 }
 965
 966 void ConvertSceneNodes(const gltf2::Scene& scene, ConversionContext& context, bool isMRendererModel)
 967 {
 968   auto& outScene  = context.mOutput.mScene;
 969   Index rootIndex = outScene.GetNodeCount();
 970   switch(scene.mNodes.size())
 971   {
 972     case 0:
 973       break;
 974
 975     case 1:
 976       ConvertNode(*scene.mNodes[0], scene.mNodes[0].GetIndex(), INVALID_INDEX, context, isMRendererModel);
 977       outScene.AddRootNode(rootIndex);
 978       break;
 979
 980     default:
 981     {
 982       std::unique_ptr<NodeDefinition> sceneRoot{new NodeDefinition()};
 983       sceneRoot->mName = "GLTF_LOADER_SCENE_ROOT_" + std::to_string(outScene.GetRoots().size());
 984
 985       outScene.AddNode(std::move(sceneRoot));
 986       outScene.AddRootNode(rootIndex);
 987
 988       for(auto& node : scene.mNodes)
 989       {
 990         ConvertNode(*node, node.GetIndex(), rootIndex, context, isMRendererModel);
 991       }
 992       break;
 993     }
 994   }
 995 }
 996
 997 void ConvertNodes(const gltf2::Document& document, ConversionContext& context, bool isMRendererModel)
 998 {
 999   if(!document.mScenes.empty())
1000   {
1001     uint32_t rootSceneIndex = 0u;
1002     if(document.mScene)
1003     {
1004       rootSceneIndex = document.mScene.GetIndex();
1005     }
1006     ConvertSceneNodes(document.mScenes[rootSceneIndex], context, isMRendererModel);
1007
1008     for(uint32_t i = 0; i < rootSceneIndex; ++i)
1009     {
1010       ConvertSceneNodes(document.mScenes[i], context, isMRendererModel);
1011     }
1012
1013     for(uint32_t i = rootSceneIndex + 1; i < document.mScenes.size(); ++i)
1014     {
1015       ConvertSceneNodes(document.mScenes[i], context, isMRendererModel);
1016     }
1017   }
1018 }
1019
1020 template<typename T>
1021 void LoadDataFromAccessor(ConversionContext& context, uint32_t bufferIndex, Vector<T>& dataBuffer, uint32_t offset, uint32_t size)
1022 {
1023   if(bufferIndex >= context.mOutput.mResources.mBuffers.size())
1024   {
1025     DALI_LOG_ERROR("Invailid buffer index\n");
1026     return;
1027   }
1028
1029   auto& buffer = context.mOutput.mResources.mBuffers[bufferIndex];
1030   if(!buffer.IsAvailable())
1031   {
1032     DALI_LOG_ERROR("Failed to load from buffer stream.\n");
1033   }
1034   auto& stream = buffer.GetBufferStream();
1035   stream.clear();
1036   stream.seekg(offset, stream.beg);
1037   stream.read(reinterpret_cast<char*>(dataBuffer.Begin()), static_cast<std::streamsize>(static_cast<size_t>(size)));
1038 }
1039
1040 template<typename T>
1041 float LoadDataFromAccessors(ConversionContext& context, const gltf2::Accessor& input, const gltf2::Accessor& output, Vector<float>& inputDataBuffer, Vector<T>& outputDataBuffer)
1042 {
1043   inputDataBuffer.Resize(input.mCount);
1044   outputDataBuffer.Resize(output.mCount);
1045
1046   const uint32_t inputDataBufferSize  = input.GetBytesLength();
1047   const uint32_t outputDataBufferSize = output.GetBytesLength();
1048
1049   LoadDataFromAccessor<float>(context, output.mBufferView->mBuffer.GetIndex(), inputDataBuffer, input.mBufferView->mByteOffset + input.mByteOffset, inputDataBufferSize);
1050   LoadDataFromAccessor<T>(context, output.mBufferView->mBuffer.GetIndex(), outputDataBuffer, output.mBufferView->mByteOffset + output.mByteOffset, outputDataBufferSize);
1051   ApplyAccessorMinMax(input, reinterpret_cast<float*>(inputDataBuffer.begin()));
1052   ApplyAccessorMinMax(output, reinterpret_cast<float*>(outputDataBuffer.begin()));
1053
1054   return inputDataBuffer[input.mCount - 1u];
1055 }
1056
1057 template<typename T>
1058 float LoadKeyFrames(ConversionContext& context, const gltf2::Animation::Channel& channel, KeyFrames& keyFrames, gltf2::Animation::Channel::Target::Type type)
1059 {
1060   const gltf2::Accessor& input  = *channel.mSampler->mInput;
1061   const gltf2::Accessor& output = *channel.mSampler->mOutput;
1062
1063   Vector<float> inputDataBuffer;
1064   Vector<T>     outputDataBuffer;
1065
1066   const float duration = std::max(LoadDataFromAccessors<T>(context, input, output, inputDataBuffer, outputDataBuffer), AnimationDefinition::MIN_DURATION_SECONDS);
1067
1068   // Set first frame value as first keyframe (gltf animation spec)
1069   if(input.mCount > 0 && !Dali::EqualsZero(inputDataBuffer[0]))
1070   {
1071     keyFrames.Add(0.0f, outputDataBuffer[0]);
1072   }
1073
1074   for(uint32_t i = 0; i < input.mCount; ++i)
1075   {
1076     keyFrames.Add(inputDataBuffer[i] / duration, outputDataBuffer[i]);
1077   }
1078
1079   return duration;
1080 }
1081
1082 float LoadBlendShapeKeyFrames(ConversionContext& context, const gltf2::Animation::Channel& channel, Index nodeIndex, uint32_t& propertyIndex, std::vector<Dali::Scene3D::Loader::AnimatedProperty>& properties)
1083 {
1084   const gltf2::Accessor& input  = *channel.mSampler->mInput;
1085   const gltf2::Accessor& output = *channel.mSampler->mOutput;
1086
1087   Vector<float> inputDataBuffer;
1088   Vector<float> outputDataBuffer;
1089
1090   const float duration = std::max(LoadDataFromAccessors<float>(context, input, output, inputDataBuffer, outputDataBuffer), AnimationDefinition::MIN_DURATION_SECONDS);
1091
1092   char        weightNameBuffer[32];
1093   auto        prefixSize    = snprintf(weightNameBuffer, sizeof(weightNameBuffer), "%s[", BLEND_SHAPE_WEIGHTS_UNIFORM.data());
1094   char* const pWeightName   = weightNameBuffer + prefixSize;
1095   const auto  remainingSize = sizeof(weightNameBuffer) - prefixSize;
1096   for(uint32_t weightIndex = 0u, endWeightIndex = channel.mSampler->mOutput->mCount / channel.mSampler->mInput->mCount; weightIndex < endWeightIndex; ++weightIndex)
1097   {
1098     AnimatedProperty& animatedProperty = properties[propertyIndex++];
1099
1100     animatedProperty.mNodeIndex = nodeIndex;
1101     snprintf(pWeightName, remainingSize, "%d]", weightIndex);
1102     animatedProperty.mPropertyName = std::string(weightNameBuffer);
1103
1104     animatedProperty.mKeyFrames = KeyFrames::New();
1105
1106     // Set first frame value as first keyframe (gltf animation spec)
1107     if(input.mCount > 0 && !Dali::EqualsZero(inputDataBuffer[0]))
1108     {
1109       animatedProperty.mKeyFrames.Add(0.0f, outputDataBuffer[weightIndex]);
1110     }
1111
1112     for(uint32_t i = 0; i < input.mCount; ++i)
1113     {
1114       animatedProperty.mKeyFrames.Add(inputDataBuffer[i] / duration, outputDataBuffer[i * endWeightIndex + weightIndex]);
1115     }
1116
1117     animatedProperty.mTimePeriod = {0.f, duration};
1118   }
1119
1120   return duration;
1121 }
1122
1123 template<typename T>
1124 float LoadAnimation(AnimationDefinition& animationDefinition, Index nodeIndex, Index propertyIndex, const std::string& propertyName, const gltf2::Animation::Channel& channel, ConversionContext& context)
1125 {
1126   AnimatedProperty& animatedProperty = animationDefinition.mProperties[propertyIndex];
1127
1128   animatedProperty.mNodeIndex    = nodeIndex;
1129   animatedProperty.mPropertyName = propertyName;
1130
1131   animatedProperty.mKeyFrames  = KeyFrames::New();
1132   float duration               = LoadKeyFrames<T>(context, channel, animatedProperty.mKeyFrames, channel.mTarget.mPath);
1133   animatedProperty.mTimePeriod = {0.f, duration};
1134
1135   return duration;
1136 }
1137
1138 void ConvertAnimations(const gltf2::Document& document, ConversionContext& context)
1139 {
1140   auto& output = context.mOutput;
1141
1142   output.mAnimationDefinitions.reserve(output.mAnimationDefinitions.size() + document.mAnimations.size());
1143
1144   for(const auto& animation : document.mAnimations)
1145   {
1146     AnimationDefinition animationDefinition;
1147
1148     if(!animation.mName.empty())
1149     {
1150       animationDefinition.mName = animation.mName;
1151     }
1152
1153     uint32_t numberOfProperties = 0u;
1154     for(const auto& channel : animation.mChannels)
1155     {
1156       if(channel.mTarget.mPath == gltf2::Animation::Channel::Target::WEIGHTS)
1157       {
1158         numberOfProperties += channel.mSampler->mOutput->mCount / channel.mSampler->mInput->mCount;
1159       }
1160       else
1161       {
1162         numberOfProperties++;
1163       }
1164     }
1165     animationDefinition.mProperties.resize(numberOfProperties);
1166
1167     Index propertyIndex = 0u;
1168     for(const auto& channel : animation.mChannels)
1169     {
1170       Index nodeIndex = context.mNodeIndices.GetRuntimeId(channel.mTarget.mNode.GetIndex());
1171       float duration  = 0.f;
1172
1173       switch(channel.mTarget.mPath)
1174       {
1175         case gltf2::Animation::Channel::Target::TRANSLATION:
1176         {
1177           duration = LoadAnimation<Vector3>(animationDefinition, nodeIndex, propertyIndex, POSITION_PROPERTY.data(), channel, context);
1178           break;
1179         }
1180         case gltf2::Animation::Channel::Target::ROTATION:
1181         {
1182           duration = LoadAnimation<Quaternion>(animationDefinition, nodeIndex, propertyIndex, ORIENTATION_PROPERTY.data(), channel, context);
1183           break;
1184         }
1185         case gltf2::Animation::Channel::Target::SCALE:
1186         {
1187           duration = LoadAnimation<Vector3>(animationDefinition, nodeIndex, propertyIndex, SCALE_PROPERTY.data(), channel, context);
1188           break;
1189         }
1190         case gltf2::Animation::Channel::Target::WEIGHTS:
1191         {
1192           duration = LoadBlendShapeKeyFrames(context, channel, nodeIndex, propertyIndex, animationDefinition.mProperties);
1193
1194           break;
1195         }
1196         default:
1197         {
1198           // nothing to animate.
1199           break;
1200         }
1201       }
1202
1203       animationDefinition.mDuration = std::max(duration, animationDefinition.mDuration);
1204
1205       ++propertyIndex;
1206     }
1207
1208     output.mAnimationDefinitions.push_back(std::move(animationDefinition));
1209   }
1210 }
1211
1212 void ProcessSkins(const gltf2::Document& document, ConversionContext& context)
1213 {
1214   // https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#skininversebindmatrices
1215   // If an inverseBindMatrices accessor was provided, we'll load the joint data from the buffer,
1216   // otherwise we'll set identity matrices for inverse bind pose.
1217   struct IInverseBindMatrixProvider
1218   {
1219     virtual ~IInverseBindMatrixProvider()
1220     {
1221     }
1222     virtual void Provide(Matrix& inverseBindMatrix) = 0;
1223   };
1224
1225   struct InverseBindMatrixAccessor : public IInverseBindMatrixProvider
1226   {
1227     std::istream&  mStream;
1228     const uint32_t mElementSizeBytes;
1229
1230     InverseBindMatrixAccessor(const gltf2::Accessor& accessor, ConversionContext& context)
1231     : mStream(context.mOutput.mResources.mBuffers[accessor.mBufferView->mBuffer.GetIndex()].GetBufferStream()),
1232       mElementSizeBytes(accessor.GetElementSizeBytes())
1233     {
1234       DALI_ASSERT_DEBUG(accessor.mType == gltf2::AccessorType::MAT4 && accessor.mComponentType == gltf2::Component::FLOAT);
1235
1236       if(!mStream.rdbuf()->in_avail())
1237       {
1238         DALI_LOG_ERROR("Failed to load from stream\n");
1239       }
1240       mStream.clear();
1241       mStream.seekg(accessor.mBufferView->mByteOffset + accessor.mByteOffset, mStream.beg);
1242     }
1243
1244     virtual void Provide(Matrix& inverseBindMatrix) override
1245     {
1246       DALI_ASSERT_ALWAYS(mStream.read(reinterpret_cast<char*>(inverseBindMatrix.AsFloat()), static_cast<std::streamsize>(static_cast<size_t>(mElementSizeBytes))));
1247     }
1248   };
1249
1250   struct DefaultInverseBindMatrixProvider : public IInverseBindMatrixProvider
1251   {
1252     virtual void Provide(Matrix& inverseBindMatrix) override
1253     {
1254       inverseBindMatrix = Matrix::IDENTITY;
1255     }
1256   };
1257
1258   auto& resources = context.mOutput.mResources;
1259   resources.mSkeletons.reserve(document.mSkins.size());
1260
1261   for(auto& skin : document.mSkins)
1262   {
1263     std::unique_ptr<IInverseBindMatrixProvider> inverseBindMatrixProvider;
1264     if(skin.mInverseBindMatrices)
1265     {
1266       inverseBindMatrixProvider.reset(new InverseBindMatrixAccessor(*skin.mInverseBindMatrices, context));
1267     }
1268     else
1269     {
1270       inverseBindMatrixProvider.reset(new DefaultInverseBindMatrixProvider());
1271     }
1272
1273     SkeletonDefinition skeleton;
1274     if(skin.mSkeleton.GetIndex() != INVALID_INDEX)
1275     {
1276       skeleton.mRootNodeIdx = context.mNodeIndices.GetRuntimeId(skin.mSkeleton.GetIndex());
1277     }
1278
1279     skeleton.mJoints.resize(skin.mJoints.size());
1280     auto iJoint = skeleton.mJoints.begin();
1281     for(auto& joint : skin.mJoints)
1282     {
1283       iJoint->mNodeIdx = context.mNodeIndices.GetRuntimeId(joint.GetIndex());
1284
1285       inverseBindMatrixProvider->Provide(iJoint->mInverseBindMatrix);
1286
1287       ++iJoint;
1288     }
1289
1290     resources.mSkeletons.push_back(std::move(skeleton));
1291   }
1292 }
1293
1294 void ProduceShaders(ShaderDefinitionFactory& shaderFactory, Dali::Scene3D::Loader::SceneDefinition& scene)
1295 {
1296   uint32_t nodeCount = scene.GetNodeCount();
1297   for(uint32_t i = 0; i < nodeCount; ++i)
1298   {
1299     auto nodeDefinition = scene.GetNode(i);
1300     for(auto& renderable : nodeDefinition->mRenderables)
1301     {
1302       if(shaderFactory.ProduceShader(*renderable) == INVALID_INDEX)
1303       {
1304         DALI_LOG_ERROR("Fail to produce shader\n");
1305       }
1306     }
1307   }
1308 }
1309
1310 void SetObjectReaders()
1311 {
1312   json::SetObjectReader(GetBufferReader());
1313   json::SetObjectReader(GetBufferViewReader());
1314   json::SetObjectReader(GetBufferViewClientReader());
1315   json::SetObjectReader(GetComponentTypedBufferViewClientReader());
1316   json::SetObjectReader(GetAccessorSparseReader());
1317   json::SetObjectReader(GetAccessorReader());
1318   json::SetObjectReader(GetImageReader());
1319   json::SetObjectReader(GetSamplerReader());
1320   json::SetObjectReader(GetTextureReader());
1321   json::SetObjectReader(GetTextureInfoReader());
1322   json::SetObjectReader(GetMaterialPbrReader());
1323   json::SetObjectReader(GetMaterialSpecularReader());
1324   json::SetObjectReader(GetMaterialIorReader());
1325   json::SetObjectReader(GetMaterialExtensionsReader());
1326   json::SetObjectReader(GetMaterialReader());
1327   json::SetObjectReader(GetMeshPrimitiveReader());
1328   json::SetObjectReader(GetMeshReader());
1329   json::SetObjectReader(GetSkinReader());
1330   json::SetObjectReader(GetCameraPerspectiveReader());
1331   json::SetObjectReader(GetCameraOrthographicReader());
1332   json::SetObjectReader(GetCameraReader());
1333   json::SetObjectReader(GetNodeReader());
1334   json::SetObjectReader(GetAnimationSamplerReader());
1335   json::SetObjectReader(GetAnimationChannelTargetReader());
1336   json::SetObjectReader(GetAnimationChannelReader());
1337   json::SetObjectReader(GetAnimationReader());
1338   json::SetObjectReader(GetSceneReader());
1339 }
1340
1341 void SetDefaultEnvironmentMap(const gltf2::Document& document, ConversionContext& context)
1342 {
1343   EnvironmentDefinition environmentDefinition;
1344   environmentDefinition.mUseBrdfTexture = true;
1345   environmentDefinition.mIblIntensity   = Scene3D::Loader::EnvironmentDefinition::GetDefaultIntensity();
1346   context.mOutput.mResources.mEnvironmentMaps.push_back({std::move(environmentDefinition), EnvironmentDefinition::Textures()});
1347 }
1348
1349 void InitializeGltfLoader()
1350 {
1351   static Dali::Mutex initializeMutex;
1352   // Set ObjectReader only once (for all gltf loading).
1353   static bool setObjectReadersRequired = true;
1354   {
1355     Mutex::ScopedLock lock(initializeMutex);
1356     if(setObjectReadersRequired)
1357     {
1358       // NOTE: only referencing own, anonymous namespace, const objects; the pointers will never need to change.
1359       SetObjectReaders();
1360       setObjectReadersRequired = false;
1361     }
1362   }
1363 }
1364
1365 const std::string_view GetRendererModelIdentification()
1366 {
1367   return MRENDERER_MODEL_IDENTIFICATION;
1368 }
1369
1370 void ReadDocument(const json_object_s& jsonObject, gltf2::Document& document)
1371 {
1372   GetDocumentReader().Read(jsonObject, document);
1373 }
1374
1375 void ReadDocumentFromParsedData(const json_object_s& jsonObject, gltf2::Document& document)
1376 {
1377   static Dali::Mutex readMutex;
1378   Mutex::ScopedLock  lock(readMutex);
1379   gt::SetRefReaderObject(document);
1380   Gltf2Util::ReadDocument(jsonObject, document);
1381 }
1382
1383 bool GenerateDocument(json::unique_ptr& root, gt::Document& document, bool& isMRendererModel)
1384 {
1385   auto& rootObject = js::Cast<json_object_s>(*root);
1386   auto  jsonAsset  = js::FindObjectChild("asset", rootObject);
1387
1388   auto jsAssetVersion = js::FindObjectChild("version", js::Cast<json_object_s>(*jsonAsset));
1389   if(jsAssetVersion)
1390   {
1391     document.mAsset.mVersion = js::Read::StringView(*jsAssetVersion);
1392   }
1393
1394   auto jsAssetGenerator = js::FindObjectChild("generator", js::Cast<json_object_s>(*jsonAsset));
1395   if(jsAssetGenerator)
1396   {
1397     document.mAsset.mGenerator = js::Read::StringView(*jsAssetGenerator);
1398     isMRendererModel           = (document.mAsset.mGenerator.find(Gltf2Util::GetRendererModelIdentification().data()) != std::string_view::npos);
1399   }
1400
1401   Gltf2Util::InitializeGltfLoader();
1402   Gltf2Util::ReadDocumentFromParsedData(rootObject, document);
1403
1404   return true;
1405 }
1406
1407 void ConvertGltfToContext(gt::Document& document, Gltf2Util::ConversionContext& context, bool isMRendererModel)
1408 {
1409   Dali::Scene3D::Loader::ShaderDefinitionFactory shaderFactory;
1410   shaderFactory.SetResources(context.mOutput.mResources);
1411
1412   Gltf2Util::ConvertBuffers(document, context);
1413   Gltf2Util::ConvertMaterials(document, context);
1414   Gltf2Util::ConvertMeshes(document, context);
1415   Gltf2Util::ConvertNodes(document, context, isMRendererModel);
1416   Gltf2Util::ConvertAnimations(document, context);
1417   Gltf2Util::ProcessSkins(document, context);
1418   Gltf2Util::ProduceShaders(shaderFactory, context.mOutput.mScene);
1419   context.mOutput.mScene.EnsureUniqueSkinningShaderInstances(context.mOutput.mResources);
1420
1421   // Set Default Environment map
1422   Gltf2Util::SetDefaultEnvironmentMap(document, context);
1423 }
1424
1425 } // namespace Gltf2Util
1426
1427 } // namespace Dali::Scene3D::Loader::Internal