dali-scene3d/public-api/loader/gltf2-loader.cpp

   1 /*
   2  * Copyright (c) 2022 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 // FILE HEADER
  19 #include <dali-scene3d/public-api/loader/gltf2-loader.h>
  20
  21 // EXTERNAL INCLUDES
  22 #include <dali/integration-api/debug.h>
  23 #include <dali/public-api/images/image-operations.h>
  24 #include <dali/public-api/math/quaternion.h>
  25 #include <fstream>
  26
  27 // INTERNAL INCLUDES
  28 #include <dali-scene3d/internal/loader/gltf2-asset.h>
  29 #include <dali-scene3d/public-api/loader/load-result.h>
  30 #include <dali-scene3d/public-api/loader/resource-bundle.h>
  31 #include <dali-scene3d/public-api/loader/scene-definition.h>
  32 #include <dali-scene3d/public-api/loader/shader-definition-factory.h>
  33 #include <dali-scene3d/public-api/loader/utils.h>
  34
  35 namespace gt = gltf2;
  36 namespace js = json;
  37
  38 namespace Dali
  39 {
  40 namespace Scene3D
  41 {
  42 namespace Loader
  43 {
  44 namespace
  45 {
  46 const std::string POSITION_PROPERTY("position");
  47 const std::string ORIENTATION_PROPERTY("orientation");
  48 const std::string SCALE_PROPERTY("scale");
  49 const std::string BLEND_SHAPE_WEIGHTS_UNIFORM("uBlendShapeWeight");
  50 const std::string MRENDERER_MODEL_IDENTIFICATION("M-Renderer");
  51 const std::string ROOT_NODE_NAME("RootNode");
  52 const Vector3     SCALE_TO_ADJUST(100.0f, 100.0f, 100.0f);
  53
  54 const Geometry::Type GLTF2_TO_DALI_PRIMITIVES[]{
  55   Geometry::POINTS,
  56   Geometry::LINES,
  57   Geometry::LINE_LOOP,
  58   Geometry::LINE_STRIP,
  59   Geometry::TRIANGLES,
  60   Geometry::TRIANGLE_STRIP,
  61   Geometry::TRIANGLE_FAN}; //...because Dali swaps the last two.
  62
  63 struct AttributeMapping
  64 {
  65   gt::Attribute::Type      mType;
  66   MeshDefinition::Accessor MeshDefinition::*mAccessor;
  67   uint16_t                                  mElementSizeRequired;
  68 } ATTRIBUTE_MAPPINGS[]{
  69   {gt::Attribute::NORMAL, &MeshDefinition::mNormals, sizeof(Vector3)},
  70   {gt::Attribute::TANGENT, &MeshDefinition::mTangents, sizeof(Vector3)},
  71   {gt::Attribute::TEXCOORD_0, &MeshDefinition::mTexCoords, sizeof(Vector2)},
  72   {gt::Attribute::COLOR_0, &MeshDefinition::mColors, sizeof(Vector4)},
  73   {gt::Attribute::JOINTS_0, &MeshDefinition::mJoints0, sizeof(Vector4)},
  74   {gt::Attribute::WEIGHTS_0, &MeshDefinition::mWeights0, sizeof(Vector4)},
  75 };
  76
  77 std::vector<gt::Animation> ReadAnimationArray(const json_value_s& j)
  78 {
  79   gt::Animation proxy;
  80   SetRefReaderObject(proxy);
  81
  82   auto results = js::Read::Array<gt::Animation, js::ObjectReader<gt::Animation>::Read>(j);
  83
  84   for(auto& animation : results)
  85   {
  86     for(auto& channel : animation.mChannels)
  87     {
  88       channel.mSampler.UpdateVector(animation.mSamplers);
  89     }
  90   }
  91
  92   return results;
  93 }
  94
  95 void ApplyAccessorMinMax(const gt::Accessor& acc, float* values)
  96 {
  97   DALI_ASSERT_ALWAYS(acc.mMax.empty() || gt::AccessorType::ElementCount(acc.mType) == acc.mMax.size());
  98   DALI_ASSERT_ALWAYS(acc.mMin.empty() || gt::AccessorType::ElementCount(acc.mType) == acc.mMin.size());
  99   MeshDefinition::Blob::ApplyMinMax(acc.mMin, acc.mMax, acc.mCount, values);
 100 }
 101
 102 const auto BUFFER_READER = std::move(js::Reader<gt::Buffer>()
 103                                        .Register(*js::MakeProperty("byteLength", js::Read::Number<uint32_t>, &gt::Buffer::mByteLength))
 104                                        .Register(*js::MakeProperty("uri", js::Read::StringView, &gt::Buffer::mUri)));
 105
 106 const auto BUFFER_VIEW_READER = std::move(js::Reader<gt::BufferView>()
 107                                             .Register(*js::MakeProperty("buffer", gt::RefReader<gt::Document>::Read<gt::Buffer, &gt::Document::mBuffers>, &gt::BufferView::mBuffer))
 108                                             .Register(*js::MakeProperty("byteOffset", js::Read::Number<uint32_t>, &gt::BufferView::mByteOffset))
 109                                             .Register(*js::MakeProperty("byteLength", js::Read::Number<uint32_t>, &gt::BufferView::mByteLength))
 110                                             .Register(*js::MakeProperty("byteStride", js::Read::Number<uint32_t>, &gt::BufferView::mByteStride))
 111                                             .Register(*js::MakeProperty("target", js::Read::Number<uint32_t>, &gt::BufferView::mTarget)));
 112
 113 const auto BUFFER_VIEW_CLIENT_READER = std::move(js::Reader<gt::BufferViewClient>()
 114                                                    .Register(*js::MakeProperty("bufferView", gt::RefReader<gt::Document>::Read<gt::BufferView, &gt::Document::mBufferViews>, &gt::BufferViewClient::mBufferView))
 115                                                    .Register(*js::MakeProperty("byteOffset", js::Read::Number<uint32_t>, &gt::BufferViewClient::mByteOffset)));
 116
 117 const auto COMPONENT_TYPED_BUFFER_VIEW_CLIENT_READER = std::move(js::Reader<gt::ComponentTypedBufferViewClient>()
 118                                                                    .Register(*new js::Property<gt::ComponentTypedBufferViewClient, gt::Ref<gt::BufferView>>("bufferView", gt::RefReader<gt::Document>::Read<gt::BufferView, &gt::Document::mBufferViews>, &gt::ComponentTypedBufferViewClient::mBufferView))
 119                                                                    .Register(*new js::Property<gt::ComponentTypedBufferViewClient, uint32_t>("byteOffset", js::Read::Number<uint32_t>, &gt::ComponentTypedBufferViewClient::mByteOffset))
 120                                                                    .Register(*js::MakeProperty("componentType", js::Read::Enum<gt::Component::Type>, &gt::ComponentTypedBufferViewClient::mComponentType)));
 121
 122 const auto ACCESSOR_SPARSE_READER = std::move(js::Reader<gt::Accessor::Sparse>()
 123                                                 .Register(*js::MakeProperty("count", js::Read::Number<uint32_t>, &gt::Accessor::Sparse::mCount))
 124                                                 .Register(*js::MakeProperty("indices", js::ObjectReader<gt::ComponentTypedBufferViewClient>::Read, &gt::Accessor::Sparse::mIndices))
 125                                                 .Register(*js::MakeProperty("values", js::ObjectReader<gt::BufferViewClient>::Read, &gt::Accessor::Sparse::mValues)));
 126
 127 const auto ACCESSOR_READER = std::move(js::Reader<gt::Accessor>()
 128                                          .Register(*new js::Property<gt::Accessor, gt::Ref<gt::BufferView>>("bufferView",
 129                                                                                                             gt::RefReader<gt::Document>::Read<gt::BufferView, &gt::Document::mBufferViews>,
 130                                                                                                             &gt::Accessor::mBufferView))
 131                                          .Register(*new js::Property<gt::Accessor, uint32_t>("byteOffset",
 132                                                                                              js::Read::Number<uint32_t>,
 133                                                                                              &gt::Accessor::mByteOffset))
 134                                          .Register(*new js::Property<gt::Accessor, gt::Component::Type>("componentType",
 135                                                                                                         js::Read::Enum<gt::Component::Type>,
 136                                                                                                         &gt::Accessor::mComponentType))
 137                                          .Register(*new js::Property<gt::Accessor, std::string_view>("name", js::Read::StringView, &gt::Accessor::mName))
 138                                          .Register(*js::MakeProperty("count", js::Read::Number<uint32_t>, &gt::Accessor::mCount))
 139                                          .Register(*js::MakeProperty("normalized", js::Read::Boolean, &gt::Accessor::mNormalized))
 140                                          .Register(*js::MakeProperty("type", gt::ReadStringEnum<gt::AccessorType>, &gt::Accessor::mType))
 141                                          .Register(*js::MakeProperty("min", js::Read::Array<float, js::Read::Number>, &gt::Accessor::mMin))
 142                                          .Register(*js::MakeProperty("max", js::Read::Array<float, js::Read::Number>, &gt::Accessor::mMax))
 143                                          .Register(*new js::Property<gt::Accessor, gt::Accessor::Sparse>("sparse", js::ObjectReader<gt::Accessor::Sparse>::Read, &gt::Accessor::SetSparse)));
 144
 145 const auto IMAGE_READER = std::move(js::Reader<gt::Image>()
 146                                       .Register(*new js::Property<gt::Image, std::string_view>("name", js::Read::StringView, &gt::Material::mName))
 147                                       .Register(*js::MakeProperty("uri", js::Read::StringView, &gt::Image::mUri))
 148                                       .Register(*js::MakeProperty("mimeType", js::Read::StringView, &gt::Image::mMimeType))
 149                                       .Register(*js::MakeProperty("bufferView", gt::RefReader<gt::Document>::Read<gt::BufferView, &gt::Document::mBufferViews>, &gt::Image::mBufferView)));
 150
 151 const auto SAMPLER_READER = std::move(js::Reader<gt::Sampler>()
 152                                         .Register(*js::MakeProperty("minFilter", js::Read::Enum<gt::Filter::Type>, &gt::Sampler::mMinFilter))
 153                                         .Register(*js::MakeProperty("magFilter", js::Read::Enum<gt::Filter::Type>, &gt::Sampler::mMagFilter))
 154                                         .Register(*js::MakeProperty("wrapS", js::Read::Enum<gt::Wrap::Type>, &gt::Sampler::mWrapS))
 155                                         .Register(*js::MakeProperty("wrapT", js::Read::Enum<gt::Wrap::Type>, &gt::Sampler::mWrapT)));
 156
 157 const auto TEXURE_READER = std::move(js::Reader<gt::Texture>()
 158                                        .Register(*js::MakeProperty("source", gt::RefReader<gt::Document>::Read<gt::Image, &gt::Document::mImages>, &gt::Texture::mSource))
 159                                        .Register(*js::MakeProperty("sampler", gt::RefReader<gt::Document>::Read<gt::Sampler, &gt::Document::mSamplers>, &gt::Texture::mSampler)));
 160
 161 const auto TEXURE_INFO_READER = std::move(js::Reader<gt::TextureInfo>()
 162                                             .Register(*js::MakeProperty("index", gt::RefReader<gt::Document>::Read<gt::Texture, &gt::Document::mTextures>, &gt::TextureInfo::mTexture))
 163                                             .Register(*js::MakeProperty("texCoord", js::Read::Number<uint32_t>, &gt::TextureInfo::mTexCoord))
 164                                             .Register(*js::MakeProperty("scale", js::Read::Number<float>, &gt::TextureInfo::mScale))
 165                                             .Register(*js::MakeProperty("strength", js::Read::Number<float>, &gt::TextureInfo::mStrength)));
 166
 167 const auto MATERIAL_PBR_READER = std::move(js::Reader<gt::Material::Pbr>()
 168                                              .Register(*js::MakeProperty("baseColorFactor", gt::ReadDaliVector<Vector4>, &gt::Material::Pbr::mBaseColorFactor))
 169                                              .Register(*js::MakeProperty("baseColorTexture", js::ObjectReader<gt::TextureInfo>::Read, &gt::Material::Pbr::mBaseColorTexture))
 170                                              .Register(*js::MakeProperty("metallicFactor", js::Read::Number<float>, &gt::Material::Pbr::mMetallicFactor))
 171                                              .Register(*js::MakeProperty("roughnessFactor", js::Read::Number<float>, &gt::Material::Pbr::mRoughnessFactor))
 172                                              .Register(*js::MakeProperty("metallicRoughnessTexture", js::ObjectReader<gt::TextureInfo>::Read, &gt::Material::Pbr::mMetallicRoughnessTexture)));
 173
 174 const auto MATERIAL_SPECULAR_READER = std::move(js::Reader<gt::MaterialSpecular>()
 175                                                   .Register(*js::MakeProperty("specularFactor", js::Read::Number<float>, &gt::MaterialSpecular::mSpecularFactor))
 176                                                   .Register(*js::MakeProperty("specularTexture", js::ObjectReader<gt::TextureInfo>::Read, &gt::MaterialSpecular::mSpecularTexture))
 177                                                   .Register(*js::MakeProperty("specularColorFactor", gt::ReadDaliVector<Vector3>, &gt::MaterialSpecular::mSpecularColorFactor))
 178                                                   .Register(*js::MakeProperty("specularColorTexture", js::ObjectReader<gt::TextureInfo>::Read, &gt::MaterialSpecular::mSpecularColorTexture)));
 179
 180 const auto MATERIAL_IOR_READER = std::move(js::Reader<gt::MaterialIor>()
 181                                              .Register(*js::MakeProperty("ior", js::Read::Number<float>, &gt::MaterialIor::mIor)));
 182
 183 const auto MATERIAL_EXTENSION_READER = std::move(js::Reader<gt::MaterialExtensions>()
 184                                                    .Register(*js::MakeProperty("KHR_materials_ior", js::ObjectReader<gt::MaterialIor>::Read, &gt::MaterialExtensions::mMaterialIor))
 185                                                    .Register(*js::MakeProperty("KHR_materials_specular", js::ObjectReader<gt::MaterialSpecular>::Read, &gt::MaterialExtensions::mMaterialSpecular)));
 186
 187 const auto MATERIAL_READER = std::move(js::Reader<gt::Material>()
 188                                          .Register(*new js::Property<gt::Material, std::string_view>("name", js::Read::StringView, &gt::Material::mName))
 189                                          .Register(*js::MakeProperty("pbrMetallicRoughness", js::ObjectReader<gt::Material::Pbr>::Read, &gt::Material::mPbrMetallicRoughness))
 190                                          .Register(*js::MakeProperty("normalTexture", js::ObjectReader<gt::TextureInfo>::Read, &gt::Material::mNormalTexture))
 191                                          .Register(*js::MakeProperty("occlusionTexture", js::ObjectReader<gt::TextureInfo>::Read, &gt::Material::mOcclusionTexture))
 192                                          .Register(*js::MakeProperty("emissiveTexture", js::ObjectReader<gt::TextureInfo>::Read, &gt::Material::mEmissiveTexture))
 193                                          .Register(*js::MakeProperty("emissiveFactor", gt::ReadDaliVector<Vector3>, &gt::Material::mEmissiveFactor))
 194                                          .Register(*js::MakeProperty("alphaMode", gt::ReadStringEnum<gt::AlphaMode>, &gt::Material::mAlphaMode))
 195                                          .Register(*js::MakeProperty("alphaCutoff", js::Read::Number<float>, &gt::Material::mAlphaCutoff))
 196                                          .Register(*js::MakeProperty("doubleSided", js::Read::Boolean, &gt::Material::mDoubleSided))
 197                                          .Register(*js::MakeProperty("extensions", js::ObjectReader<gt::MaterialExtensions>::Read, &gt::Material::mMaterialExtensions)));
 198
 199 std::map<gt::Attribute::Type, gt::Ref<gt::Accessor>> ReadMeshPrimitiveAttributes(const json_value_s& j)
 200 {
 201   auto&                                                jo = js::Cast<json_object_s>(j);
 202   std::map<gt::Attribute::Type, gt::Ref<gt::Accessor>> result;
 203
 204   auto i = jo.start;
 205   while(i)
 206   {
 207     auto jstr                                                        = *i->name;
 208     result[gt::Attribute::FromString(jstr.string, jstr.string_size)] = gt::RefReader<gt::Document>::Read<gt::Accessor, &gt::Document::mAccessors>(*i->value);
 209     i                                                                = i->next;
 210   }
 211   return result;
 212 }
 213
 214 std::vector<std::map<gt::Attribute::Type, gt::Ref<gt::Accessor>>> ReadMeshPrimitiveTargets(const json_value_s& j)
 215 {
 216   auto&                                                             jo = js::Cast<json_array_s>(j);
 217   std::vector<std::map<gt::Attribute::Type, gt::Ref<gt::Accessor>>> result;
 218
 219   result.reserve(jo.length);
 220
 221   auto i = jo.start;
 222   while(i)
 223   {
 224     result.push_back(std::move(ReadMeshPrimitiveAttributes(*i->value)));
 225     i = i->next;
 226   }
 227
 228   return result;
 229 }
 230
 231 const auto MESH_PRIMITIVE_READER = std::move(js::Reader<gt::Mesh::Primitive>()
 232                                                .Register(*js::MakeProperty("attributes", ReadMeshPrimitiveAttributes, &gt::Mesh::Primitive::mAttributes))
 233                                                .Register(*js::MakeProperty("indices", gt::RefReader<gt::Document>::Read<gt::Accessor, &gt::Document::mAccessors>, &gt::Mesh::Primitive::mIndices))
 234                                                .Register(*js::MakeProperty("material", gt::RefReader<gt::Document>::Read<gt::Material, &gt::Document::mMaterials>, &gt::Mesh::Primitive::mMaterial))
 235                                                .Register(*js::MakeProperty("mode", js::Read::Enum<gt::Mesh::Primitive::Mode>, &gt::Mesh::Primitive::mMode))
 236                                                .Register(*js::MakeProperty("targets", ReadMeshPrimitiveTargets, &gt::Mesh::Primitive::mTargets)));
 237
 238 const auto MESH_READER = std::move(js::Reader<gt::Mesh>()
 239                                      .Register(*new js::Property<gt::Mesh, std::string_view>("name", js::Read::StringView, &gt::Mesh::mName))
 240                                      .Register(*js::MakeProperty("primitives",
 241                                                                  js::Read::Array<gt::Mesh::Primitive, js::ObjectReader<gt::Mesh::Primitive>::Read>,
 242                                                                  &gt::Mesh::mPrimitives))
 243                                      .Register(*js::MakeProperty("weights", js::Read::Array<float, js::Read::Number>, &gt::Mesh::mWeights)));
 244
 245 const auto SKIN_READER = std::move(js::Reader<gt::Skin>()
 246                                      .Register(*new js::Property<gt::Skin, std::string_view>("name", js::Read::StringView, &gt::Skin::mName))
 247                                      .Register(*js::MakeProperty("inverseBindMatrices",
 248                                                                  gt::RefReader<gt::Document>::Read<gt::Accessor, &gt::Document::mAccessors>,
 249                                                                  &gt::Skin::mInverseBindMatrices))
 250                                      .Register(*js::MakeProperty("skeleton",
 251                                                                  gt::RefReader<gt::Document>::Read<gt::Node, &gt::Document::mNodes>,
 252                                                                  &gt::Skin::mSkeleton))
 253                                      .Register(*js::MakeProperty("joints",
 254                                                                  js::Read::Array<gt::Ref<gt::Node>, gt::RefReader<gt::Document>::Read<gt::Node, &gt::Document::mNodes>>,
 255                                                                  &gt::Skin::mJoints)));
 256
 257 const auto CAMERA_PERSPECTIVE_READER = std::move(js::Reader<gt::Camera::Perspective>()
 258                                                    .Register(*js::MakeProperty("aspectRatio", js::Read::Number<float>, &gt::Camera::Perspective::mAspectRatio))
 259                                                    .Register(*js::MakeProperty("yfov", js::Read::Number<float>, &gt::Camera::Perspective::mYFov))
 260                                                    .Register(*js::MakeProperty("zfar", js::Read::Number<float>, &gt::Camera::Perspective::mZFar))
 261                                                    .Register(*js::MakeProperty("znear", js::Read::Number<float>, &gt::Camera::Perspective::mZNear))); // TODO: infinite perspective projection, where znear is omitted
 262
 263 const auto CAMERA_ORTHOGRAPHIC_READER = std::move(js::Reader<gt::Camera::Orthographic>()
 264                                                     .Register(*js::MakeProperty("xmag", js::Read::Number<float>, &gt::Camera::Orthographic::mXMag))
 265                                                     .Register(*js::MakeProperty("ymag", js::Read::Number<float>, &gt::Camera::Orthographic::mXMag))
 266                                                     .Register(*js::MakeProperty("zfar", js::Read::Number<float>, &gt::Camera::Orthographic::mZFar))
 267                                                     .Register(*js::MakeProperty("znear", js::Read::Number<float>, &gt::Camera::Orthographic::mZNear)));
 268
 269 const auto CAMERA_READER = std::move(js::Reader<gt::Camera>()
 270                                        .Register(*new js::Property<gt::Camera, std::string_view>("name", js::Read::StringView, &gt::Camera::mName))
 271                                        .Register(*js::MakeProperty("type", js::Read::StringView, &gt::Camera::mType))
 272                                        .Register(*js::MakeProperty("perspective", js::ObjectReader<gt::Camera::Perspective>::Read, &gt::Camera::mPerspective))
 273                                        .Register(*js::MakeProperty("orthographic", js::ObjectReader<gt::Camera::Orthographic>::Read, &gt::Camera::mOrthographic)));
 274
 275 const auto NODE_READER = std::move(js::Reader<gt::Node>()
 276                                      .Register(*new js::Property<gt::Node, std::string_view>("name", js::Read::StringView, &gt::Node::mName))
 277                                      .Register(*js::MakeProperty("translation", gt::ReadDaliVector<Vector3>, &gt::Node::mTranslation))
 278                                      .Register(*js::MakeProperty("rotation", gt::ReadQuaternion, &gt::Node::mRotation))
 279                                      .Register(*js::MakeProperty("scale", gt::ReadDaliVector<Vector3>, &gt::Node::mScale))
 280                                      .Register(*new js::Property<gt::Node, Matrix>("matrix", gt::ReadDaliVector<Matrix>, &gt::Node::SetMatrix))
 281                                      .Register(*js::MakeProperty("camera", gt::RefReader<gt::Document>::Read<gt::Camera, &gt::Document::mCameras>, &gt::Node::mCamera))
 282                                      .Register(*js::MakeProperty("children", js::Read::Array<gt::Ref<gt::Node>, gt::RefReader<gt::Document>::Read<gt::Node, &gt::Document::mNodes>>, &gt::Node::mChildren))
 283                                      .Register(*js::MakeProperty("mesh", gt::RefReader<gt::Document>::Read<gt::Mesh, &gt::Document::mMeshes>, &gt::Node::mMesh))
 284                                      .Register(*js::MakeProperty("skin", gt::RefReader<gt::Document>::Read<gt::Skin, &gt::Document::mSkins>, &gt::Node::mSkin)));
 285
 286 const auto ANIMATION_SAMPLER_READER = std::move(js::Reader<gt::Animation::Sampler>()
 287                                                   .Register(*js::MakeProperty("input", gt::RefReader<gt::Document>::Read<gt::Accessor, &gt::Document::mAccessors>, &gt::Animation::Sampler::mInput))
 288                                                   .Register(*js::MakeProperty("output", gt::RefReader<gt::Document>::Read<gt::Accessor, &gt::Document::mAccessors>, &gt::Animation::Sampler::mOutput))
 289                                                   .Register(*js::MakeProperty("interpolation", gt::ReadStringEnum<gt::Animation::Sampler::Interpolation>, &gt::Animation::Sampler::mInterpolation)));
 290
 291 const auto ANIMATION_TARGET_READER = std::move(js::Reader<gt::Animation::Channel::Target>()
 292                                                  .Register(*js::MakeProperty("node", gt::RefReader<gt::Document>::Read<gt::Node, &gt::Document::mNodes>, &gt::Animation::Channel::Target::mNode))
 293                                                  .Register(*js::MakeProperty("path", gt::ReadStringEnum<gt::Animation::Channel::Target>, &gt::Animation::Channel::Target::mPath)));
 294
 295 const auto ANIMATION_CHANNEL_READER = std::move(js::Reader<gt::Animation::Channel>()
 296                                                   .Register(*js::MakeProperty("target", js::ObjectReader<gt::Animation::Channel::Target>::Read, &gt::Animation::Channel::mTarget))
 297                                                   .Register(*js::MakeProperty("sampler", gt::RefReader<gt::Animation>::Read<gt::Animation::Sampler, &gt::Animation::mSamplers>, &gt::Animation::Channel::mSampler)));
 298
 299 const auto ANIMATION_READER = std::move(js::Reader<gt::Animation>()
 300                                           .Register(*new js::Property<gt::Animation, std::string_view>("name", js::Read::StringView, &gt::Animation::mName))
 301                                           .Register(*js::MakeProperty("samplers",
 302                                                                       js::Read::Array<gt::Animation::Sampler, js::ObjectReader<gt::Animation::Sampler>::Read>,
 303                                                                       &gt::Animation::mSamplers))
 304                                           .Register(*js::MakeProperty("channels",
 305                                                                       js::Read::Array<gt::Animation::Channel, js::ObjectReader<gt::Animation::Channel>::Read>,
 306                                                                       &gt::Animation::mChannels)));
 307
 308 const auto SCENE_READER = std::move(js::Reader<gt::Scene>()
 309                                       .Register(*new js::Property<gt::Scene, std::string_view>("name", js::Read::StringView, &gt::Scene::mName))
 310                                       .Register(*js::MakeProperty("nodes",
 311                                                                   js::Read::Array<gt::Ref<gt::Node>, gt::RefReader<gt::Document>::Read<gt::Node, &gt::Document::mNodes>>,
 312                                                                   &gt::Scene::mNodes)));
 313
 314 const auto DOCUMENT_READER = std::move(js::Reader<gt::Document>()
 315                                          .Register(*js::MakeProperty("buffers",
 316                                                                      js::Read::Array<gt::Buffer, js::ObjectReader<gt::Buffer>::Read>,
 317                                                                      &gt::Document::mBuffers))
 318                                          .Register(*js::MakeProperty("bufferViews",
 319                                                                      js::Read::Array<gt::BufferView, js::ObjectReader<gt::BufferView>::Read>,
 320                                                                      &gt::Document::mBufferViews))
 321                                          .Register(*js::MakeProperty("accessors",
 322                                                                      js::Read::Array<gt::Accessor, js::ObjectReader<gt::Accessor>::Read>,
 323                                                                      &gt::Document::mAccessors))
 324                                          .Register(*js::MakeProperty("images",
 325                                                                      js::Read::Array<gt::Image, js::ObjectReader<gt::Image>::Read>,
 326                                                                      &gt::Document::mImages))
 327                                          .Register(*js::MakeProperty("samplers",
 328                                                                      js::Read::Array<gt::Sampler, js::ObjectReader<gt::Sampler>::Read>,
 329                                                                      &gt::Document::mSamplers))
 330                                          .Register(*js::MakeProperty("textures",
 331                                                                      js::Read::Array<gt::Texture, js::ObjectReader<gt::Texture>::Read>,
 332                                                                      &gt::Document::mTextures))
 333                                          .Register(*js::MakeProperty("materials",
 334                                                                      js::Read::Array<gt::Material, js::ObjectReader<gt::Material>::Read>,
 335                                                                      &gt::Document::mMaterials))
 336                                          .Register(*js::MakeProperty("meshes",
 337                                                                      js::Read::Array<gt::Mesh, js::ObjectReader<gt::Mesh>::Read>,
 338                                                                      &gt::Document::mMeshes))
 339                                          .Register(*js::MakeProperty("skins",
 340                                                                      js::Read::Array<gt::Skin, js::ObjectReader<gt::Skin>::Read>,
 341                                                                      &gt::Document::mSkins))
 342                                          .Register(*js::MakeProperty("cameras",
 343                                                                      js::Read::Array<gt::Camera, js::ObjectReader<gt::Camera>::Read>,
 344                                                                      &gt::Document::mCameras))
 345                                          .Register(*js::MakeProperty("nodes",
 346                                                                      js::Read::Array<gt::Node, js::ObjectReader<gt::Node>::Read>,
 347                                                                      &gt::Document::mNodes))
 348                                          .Register(*js::MakeProperty("animations",
 349                                                                      ReadAnimationArray,
 350                                                                      &gt::Document::mAnimations))
 351                                          .Register(*js::MakeProperty("scenes",
 352                                                                      js::Read::Array<gt::Scene, js::ObjectReader<gt::Scene>::Read>,
 353                                                                      &gt::Document::mScenes))
 354                                          .Register(*js::MakeProperty("scene", gt::RefReader<gt::Document>::Read<gt::Scene, &gt::Document::mScenes>, &gt::Document::mScene)));
 355
 356 struct NodeMapping
 357 {
 358   Index gltfIdx;
 359   Index runtimeIdx;
 360 };
 361
 362 bool operator<(const NodeMapping& mapping, Index gltfIdx)
 363 {
 364   return mapping.gltfIdx < gltfIdx;
 365 }
 366
 367 class NodeIndexMapper
 368 {
 369 public:
 370   NodeIndexMapper()                       = default;
 371   NodeIndexMapper(const NodeIndexMapper&) = delete;
 372   NodeIndexMapper& operator=(const NodeIndexMapper&) = delete;
 373
 374   ///@brief Registers a mapping of the @a gltfIdx of a node to its @a runtimeIdx .
 375   ///@note If the indices are the same, the registration is omitted, in order to
 376   /// save growing a vector.
 377   void RegisterMapping(Index gltfIdx, Index runtimeIdx)
 378   {
 379     if(gltfIdx != runtimeIdx)
 380     {
 381       auto iInsert = std::lower_bound(mNodes.begin(), mNodes.end(), gltfIdx);
 382       DALI_ASSERT_DEBUG(iInsert == mNodes.end() || iInsert->gltfIdx != gltfIdx);
 383       mNodes.insert(iInsert, NodeMapping{gltfIdx, runtimeIdx});
 384     }
 385   }
 386
 387   ///@brief Retrieves the runtime index of a Node, mapped to the given @a gltfIdx.
 388   Index GetRuntimeId(Index gltfIdx) const
 389   {
 390     auto iFind = std::lower_bound(mNodes.begin(), mNodes.end(), gltfIdx); // using custom operator<
 391     return (iFind != mNodes.end() && iFind->gltfIdx == gltfIdx) ? iFind->runtimeIdx : gltfIdx;
 392   }
 393
 394 private:
 395   std::vector<NodeMapping> mNodes;
 396 };
 397
 398 struct ConversionContext
 399 {
 400   LoadResult& mOutput;
 401
 402   std::string mPath;
 403   Index       mDefaultMaterial;
 404
 405   std::vector<Index> mMeshIds;
 406   NodeIndexMapper    mNodeIndices;
 407 };
 408
 409 SamplerFlags::Type ConvertWrapMode(gt::Wrap::Type w)
 410 {
 411   switch(w)
 412   {
 413     case gt::Wrap::REPEAT:
 414       return SamplerFlags::WRAP_REPEAT;
 415     case gt::Wrap::CLAMP_TO_EDGE:
 416       return SamplerFlags::WRAP_CLAMP;
 417     case gt::Wrap::MIRRORED_REPEAT:
 418       return SamplerFlags::WRAP_MIRROR;
 419     default:
 420       throw std::runtime_error("Invalid wrap type.");
 421   }
 422 }
 423
 424 SamplerFlags::Type ConvertSampler(const gt::Ref<gt::Sampler>& s)
 425 {
 426   if(s)
 427   {
 428     return (s->mMinFilter < gt::Filter::NEAREST_MIPMAP_NEAREST) ? (s->mMinFilter - gt::Filter::NEAREST) : ((s->mMinFilter - gt::Filter::NEAREST_MIPMAP_NEAREST) + 2) | ((s->mMagFilter - gt::Filter::NEAREST) << SamplerFlags::FILTER_MAG_SHIFT) | (ConvertWrapMode(s->mWrapS) << SamplerFlags::WRAP_S_SHIFT) | (ConvertWrapMode(s->mWrapT) << SamplerFlags::WRAP_T_SHIFT);
 429   }
 430   else
 431   {
 432     // https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#texturesampler
 433     // "The index of the sampler used by this texture. When undefined, a sampler with repeat wrapping and auto filtering should be used."
 434     // "What is an auto filtering", I hear you ask. Since there's nothing else to determine mipmapping from - including glTF image
 435     // properties, if not in some extension -, we will simply assume linear filtering.
 436     return SamplerFlags::FILTER_LINEAR | (SamplerFlags::FILTER_LINEAR << SamplerFlags::FILTER_MAG_SHIFT) |
 437            (SamplerFlags::WRAP_REPEAT << SamplerFlags::WRAP_S_SHIFT) | (SamplerFlags::WRAP_REPEAT << SamplerFlags::WRAP_T_SHIFT);
 438   }
 439 }
 440
 441 TextureDefinition ConvertTextureInfo(const gt::TextureInfo& mm, const ImageMetadata& metaData = ImageMetadata())
 442 {
 443   return TextureDefinition{std::string(mm.mTexture->mSource->mUri), ConvertSampler(mm.mTexture->mSampler), metaData.mMinSize, metaData.mSamplingMode};
 444 }
 445
 446 void ConvertMaterial(const gt::Material& material, const std::unordered_map<std::string, ImageMetadata>& imageMetaData, decltype(ResourceBundle::mMaterials)& outMaterials)
 447 {
 448   auto getTextureMetaData = [](const std::unordered_map<std::string, ImageMetadata>& metaData, const gt::TextureInfo& info) {
 449     if(auto search = metaData.find(info.mTexture->mSource->mUri.data()); search != metaData.end())
 450     {
 451       return search->second;
 452     }
 453     else
 454     {
 455       return ImageMetadata();
 456     }
 457   };
 458
 459   MaterialDefinition matDef;
 460
 461   auto& pbr = material.mPbrMetallicRoughness;
 462   if(pbr.mBaseColorFactor.a < 1.f)
 463   {
 464     matDef.mFlags |= MaterialDefinition::TRANSPARENCY;
 465   }
 466
 467   if(material.mAlphaMode == gt::AlphaMode::MASK)
 468   {
 469     matDef.SetAlphaCutoff(std::min(1.f, std::max(0.f, material.mAlphaCutoff)));
 470   }
 471
 472   matDef.mBaseColorFactor = pbr.mBaseColorFactor;
 473
 474   matDef.mTextureStages.reserve(!!pbr.mBaseColorTexture + !!pbr.mMetallicRoughnessTexture + !!material.mNormalTexture + !!material.mOcclusionTexture + !!material.mEmissiveTexture);
 475   if(pbr.mBaseColorTexture)
 476   {
 477     const auto semantic = MaterialDefinition::ALBEDO;
 478     matDef.mTextureStages.push_back({semantic, ConvertTextureInfo(pbr.mBaseColorTexture, getTextureMetaData(imageMetaData, pbr.mBaseColorTexture))});
 479     // TODO: and there had better be one
 480     matDef.mFlags |= semantic;
 481   }
 482   else
 483   {
 484     matDef.mNeedAlbedoTexture = false;
 485   }
 486
 487   matDef.mMetallic  = pbr.mMetallicFactor;
 488   matDef.mRoughness = pbr.mRoughnessFactor;
 489
 490   if(pbr.mMetallicRoughnessTexture)
 491   {
 492     const auto semantic = MaterialDefinition::METALLIC | MaterialDefinition::ROUGHNESS |
 493                           MaterialDefinition::GLTF_CHANNELS;
 494     matDef.mTextureStages.push_back({semantic, ConvertTextureInfo(pbr.mMetallicRoughnessTexture, getTextureMetaData(imageMetaData, pbr.mMetallicRoughnessTexture))});
 495     // TODO: and there had better be one
 496     matDef.mFlags |= semantic;
 497   }
 498   else
 499   {
 500     matDef.mNeedMetallicRoughnessTexture = false;
 501   }
 502
 503   matDef.mNormalScale = material.mNormalTexture.mScale;
 504   if(material.mNormalTexture)
 505   {
 506     const auto semantic = MaterialDefinition::NORMAL;
 507     matDef.mTextureStages.push_back({semantic, ConvertTextureInfo(material.mNormalTexture, getTextureMetaData(imageMetaData, material.mNormalTexture))});
 508     // TODO: and there had better be one
 509     matDef.mFlags |= semantic;
 510   }
 511   else
 512   {
 513     matDef.mNeedNormalTexture = false;
 514   }
 515
 516   if(material.mOcclusionTexture)
 517   {
 518     const auto semantic = MaterialDefinition::OCCLUSION;
 519     matDef.mTextureStages.push_back({semantic, ConvertTextureInfo(material.mOcclusionTexture, getTextureMetaData(imageMetaData, material.mOcclusionTexture))});
 520     // TODO: and there had better be one
 521     matDef.mFlags |= semantic;
 522     matDef.mOcclusionStrength = material.mOcclusionTexture.mStrength;
 523   }
 524
 525   if(material.mEmissiveTexture)
 526   {
 527     const auto semantic = MaterialDefinition::EMISSIVE;
 528     matDef.mTextureStages.push_back({semantic, ConvertTextureInfo(material.mEmissiveTexture, getTextureMetaData(imageMetaData, material.mEmissiveTexture))});
 529     // TODO: and there had better be one
 530     matDef.mFlags |= semantic;
 531     matDef.mEmissiveFactor = material.mEmissiveFactor;
 532   }
 533
 534   if(material.mMaterialExtensions.mMaterialIor.mIor < MAXFLOAT)
 535   {
 536     float ior                  = material.mMaterialExtensions.mMaterialIor.mIor;
 537     matDef.mDielectricSpecular = powf((ior - 1.0f) / (ior + 1.0f), 2.0f);
 538   }
 539   matDef.mSpecularFactor      = material.mMaterialExtensions.mMaterialSpecular.mSpecularFactor;
 540   matDef.mSpecularColorFactor = material.mMaterialExtensions.mMaterialSpecular.mSpecularColorFactor;
 541
 542   if(material.mMaterialExtensions.mMaterialSpecular.mSpecularTexture)
 543   {
 544     const auto semantic = MaterialDefinition::SPECULAR;
 545     matDef.mTextureStages.push_back({semantic, ConvertTextureInfo(material.mMaterialExtensions.mMaterialSpecular.mSpecularTexture, getTextureMetaData(imageMetaData, material.mMaterialExtensions.mMaterialSpecular.mSpecularTexture))});
 546     matDef.mFlags |= semantic;
 547   }
 548
 549   if(material.mMaterialExtensions.mMaterialSpecular.mSpecularColorTexture)
 550   {
 551     const auto semantic = MaterialDefinition::SPECULAR_COLOR;
 552     matDef.mTextureStages.push_back({semantic, ConvertTextureInfo(material.mMaterialExtensions.mMaterialSpecular.mSpecularColorTexture, getTextureMetaData(imageMetaData, material.mMaterialExtensions.mMaterialSpecular.mSpecularColorTexture))});
 553     matDef.mFlags |= semantic;
 554   }
 555
 556   matDef.mDoubleSided = material.mDoubleSided;
 557
 558   outMaterials.emplace_back(std::move(matDef), TextureSet());
 559 }
 560
 561 void ConvertMaterials(const gt::Document& doc, ConversionContext& context)
 562 {
 563   auto& imageMetaData = context.mOutput.mSceneMetadata.mImageMetadata;
 564
 565   auto& outMaterials = context.mOutput.mResources.mMaterials;
 566   outMaterials.reserve(doc.mMaterials.size());
 567
 568   for(auto& m : doc.mMaterials)
 569   {
 570     ConvertMaterial(m, imageMetaData, outMaterials);
 571   }
 572 }
 573
 574 MeshDefinition::Accessor ConvertMeshPrimitiveAccessor(const gt::Accessor& acc)
 575 {
 576   DALI_ASSERT_ALWAYS((acc.mBufferView &&
 577                       (acc.mBufferView->mByteStride < std::numeric_limits<uint16_t>::max())) ||
 578                      (acc.mSparse && !acc.mBufferView));
 579
 580   DALI_ASSERT_ALWAYS(!acc.mSparse ||
 581                      ((acc.mSparse->mIndices.mBufferView && (acc.mSparse->mIndices.mBufferView->mByteStride < std::numeric_limits<uint16_t>::max())) &&
 582                       (acc.mSparse->mValues.mBufferView && (acc.mSparse->mValues.mBufferView->mByteStride < std::numeric_limits<uint16_t>::max()))));
 583
 584   MeshDefinition::SparseBlob sparseBlob;
 585   if(acc.mSparse)
 586   {
 587     const gt::Accessor::Sparse&               sparse  = *acc.mSparse;
 588     const gt::ComponentTypedBufferViewClient& indices = sparse.mIndices;
 589     const gt::BufferViewClient&               values  = sparse.mValues;
 590
 591     MeshDefinition::Blob indicesBlob(
 592       indices.mBufferView->mByteOffset + indices.mByteOffset,
 593       sparse.mCount * indices.GetBytesPerComponent(),
 594       static_cast<uint16_t>(indices.mBufferView->mByteStride),
 595       static_cast<uint16_t>(indices.GetBytesPerComponent()),
 596       {},
 597       {});
 598     MeshDefinition::Blob valuesBlob(
 599       values.mBufferView->mByteOffset + values.mByteOffset,
 600       sparse.mCount * acc.GetElementSizeBytes(),
 601       static_cast<uint16_t>(values.mBufferView->mByteStride),
 602       static_cast<uint16_t>(acc.GetElementSizeBytes()),
 603       {},
 604       {});
 605
 606     sparseBlob = std::move(MeshDefinition::SparseBlob(std::move(indicesBlob), std::move(valuesBlob), acc.mSparse->mCount));
 607   }
 608
 609   uint32_t bufferViewOffset = 0u;
 610   uint32_t bufferViewStride = 0u;
 611   if(acc.mBufferView)
 612   {
 613     bufferViewOffset = acc.mBufferView->mByteOffset;
 614     bufferViewStride = acc.mBufferView->mByteStride;
 615   }
 616
 617   return MeshDefinition::Accessor{
 618     std::move(MeshDefinition::Blob{bufferViewOffset + acc.mByteOffset,
 619                                    acc.GetBytesLength(),
 620                                    static_cast<uint16_t>(bufferViewStride),
 621                                    static_cast<uint16_t>(acc.GetElementSizeBytes()),
 622                                    acc.mMin,
 623                                    acc.mMax}),
 624     std::move(sparseBlob)};
 625 }
 626
 627 void ConvertMeshes(const gt::Document& doc, ConversionContext& context)
 628 {
 629   uint32_t meshCount = 0;
 630   context.mMeshIds.reserve(doc.mMeshes.size());
 631   for(auto& mesh : doc.mMeshes)
 632   {
 633     context.mMeshIds.push_back(meshCount);
 634     meshCount += mesh.mPrimitives.size();
 635   }
 636
 637   auto& outMeshes = context.mOutput.mResources.mMeshes;
 638   outMeshes.reserve(meshCount);
 639   for(auto& mesh : doc.mMeshes)
 640   {
 641     for(auto& primitive : mesh.mPrimitives)
 642     {
 643       MeshDefinition meshDefinition;
 644
 645       auto& attribs                 = primitive.mAttributes;
 646       meshDefinition.mUri           = attribs.begin()->second->mBufferView->mBuffer->mUri;
 647       meshDefinition.mPrimitiveType = GLTF2_TO_DALI_PRIMITIVES[primitive.mMode];
 648
 649       auto& accPositions        = *attribs.find(gt::Attribute::POSITION)->second;
 650       meshDefinition.mPositions = ConvertMeshPrimitiveAccessor(accPositions);
 651       // glTF2 support vector4 tangent for mesh.
 652       // https://www.khronos.org/registry/glTF/specs/2.0/glTF-2.0.html#meshes-overview
 653       meshDefinition.mTangentType = Property::VECTOR4;
 654
 655       const bool needNormalsTangents = accPositions.mType == gt::AccessorType::VEC3;
 656       for(auto& am : ATTRIBUTE_MAPPINGS)
 657       {
 658         auto iFind = attribs.find(am.mType);
 659         if(iFind != attribs.end())
 660         {
 661           DALI_ASSERT_DEBUG(iFind->second->mBufferView->mBuffer->mUri.compare(meshDefinition.mUri) == 0);
 662           auto& accessor = meshDefinition.*(am.mAccessor);
 663           accessor       = ConvertMeshPrimitiveAccessor(*iFind->second);
 664
 665           if(iFind->first == gt::Attribute::JOINTS_0)
 666           {
 667             meshDefinition.mFlags |= (iFind->second->mComponentType == gt::Component::UNSIGNED_SHORT) * MeshDefinition::U16_JOINT_IDS;
 668             DALI_ASSERT_DEBUG(MaskMatch(meshDefinition.mFlags, MeshDefinition::U16_JOINT_IDS) || iFind->second->mComponentType == gt::Component::FLOAT);
 669           }
 670         }
 671         else if(needNormalsTangents)
 672         {
 673           switch(am.mType)
 674           {
 675             case gt::Attribute::NORMAL:
 676               meshDefinition.RequestNormals();
 677               break;
 678
 679             case gt::Attribute::TANGENT:
 680               meshDefinition.RequestTangents();
 681               break;
 682
 683             default:
 684               break;
 685           }
 686         }
 687       }
 688
 689       if(primitive.mIndices)
 690       {
 691         meshDefinition.mIndices = ConvertMeshPrimitiveAccessor(*primitive.mIndices);
 692         meshDefinition.mFlags |= (primitive.mIndices->mComponentType == gt::Component::UNSIGNED_INT) * MeshDefinition::U32_INDICES;
 693         DALI_ASSERT_DEBUG(MaskMatch(meshDefinition.mFlags, MeshDefinition::U32_INDICES) || primitive.mIndices->mComponentType == gt::Component::UNSIGNED_SHORT);
 694       }
 695
 696       if(!primitive.mTargets.empty())
 697       {
 698         meshDefinition.mBlendShapes.reserve(primitive.mTargets.size());
 699         meshDefinition.mBlendShapeVersion = BlendShapes::Version::VERSION_2_0;
 700         for(const auto& target : primitive.mTargets)
 701         {
 702           MeshDefinition::BlendShape blendShape;
 703
 704           auto endIt = target.end();
 705           auto it    = target.find(gt::Attribute::POSITION);
 706           if(it != endIt)
 707           {
 708             blendShape.deltas = ConvertMeshPrimitiveAccessor(*it->second);
 709           }
 710           it = target.find(gt::Attribute::NORMAL);
 711           if(it != endIt)
 712           {
 713             blendShape.normals = ConvertMeshPrimitiveAccessor(*it->second);
 714           }
 715           it = target.find(gt::Attribute::TANGENT);
 716           if(it != endIt)
 717           {
 718             blendShape.tangents = ConvertMeshPrimitiveAccessor(*it->second);
 719           }
 720
 721           if(!mesh.mWeights.empty())
 722           {
 723             blendShape.weight = mesh.mWeights[meshDefinition.mBlendShapes.size()];
 724           }
 725
 726           meshDefinition.mBlendShapes.push_back(std::move(blendShape));
 727         }
 728       }
 729
 730       outMeshes.push_back({std::move(meshDefinition), MeshGeometry{}});
 731     }
 732   }
 733 }
 734
 735 ModelRenderable* MakeModelRenderable(const gt::Mesh::Primitive& prim, ConversionContext& context)
 736 {
 737   auto modelRenderable = new ModelRenderable();
 738
 739   modelRenderable->mShaderIdx = 0; // TODO: further thought
 740
 741   auto materialIdx = prim.mMaterial.GetIndex();
 742   if(INVALID_INDEX == materialIdx)
 743   {
 744     // https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#default-material
 745     if(INVALID_INDEX == context.mDefaultMaterial)
 746     {
 747       auto& outMaterials       = context.mOutput.mResources.mMaterials;
 748       context.mDefaultMaterial = outMaterials.size();
 749
 750       ConvertMaterial(gt::Material{}, context.mOutput.mSceneMetadata.mImageMetadata, outMaterials);
 751     }
 752
 753     materialIdx = context.mDefaultMaterial;
 754   }
 755
 756   modelRenderable->mMaterialIdx = materialIdx;
 757
 758   return modelRenderable;
 759 }
 760
 761 void ConvertCamera(const gt::Camera& camera, CameraParameters& camParams)
 762 {
 763   camParams.isPerspective = camera.mType.compare("perspective") == 0;
 764   if(camParams.isPerspective)
 765   {
 766     auto& perspective = camera.mPerspective;
 767     camParams.yFov    = Degree(Radian(perspective.mYFov)).degree;
 768     camParams.zNear   = perspective.mZNear;
 769     camParams.zFar    = perspective.mZFar;
 770     // TODO: yes, we seem to ignore aspectRatio in CameraParameters.
 771   }
 772   else
 773   {
 774     auto& ortho                = camera.mOrthographic;
 775     camParams.orthographicSize = ortho.mYMag * .5f;
 776     camParams.aspectRatio      = ortho.mXMag / ortho.mYMag;
 777     camParams.zNear            = ortho.mZNear;
 778     camParams.zFar             = ortho.mZFar;
 779   }
 780 }
 781
 782 void ConvertNode(gt::Node const& node, const Index gltfIdx, Index parentIdx, ConversionContext& context, bool isMRendererModel)
 783 {
 784   auto& output    = context.mOutput;
 785   auto& scene     = output.mScene;
 786   auto& resources = output.mResources;
 787
 788   const auto idx      = scene.GetNodeCount();
 789   auto       weakNode = scene.AddNode([&]() {
 790     std::unique_ptr<NodeDefinition> nodeDef{new NodeDefinition()};
 791
 792     nodeDef->mParentIdx = parentIdx;
 793     nodeDef->mName      = node.mName;
 794     if(nodeDef->mName.empty())
 795     {
 796       // TODO: Production quality generation of unique names.
 797       nodeDef->mName = std::to_string(reinterpret_cast<uintptr_t>(nodeDef.get()));
 798     }
 799
 800     if(!node.mSkin) // Nodes with skinned meshes are not supposed to have local transforms.
 801     {
 802       nodeDef->mPosition    = node.mTranslation;
 803       nodeDef->mOrientation = node.mRotation;
 804       nodeDef->mScale       = node.mScale;
 805
 806       if(isMRendererModel && node.mName == ROOT_NODE_NAME && node.mScale == SCALE_TO_ADJUST)
 807       {
 808         nodeDef->mScale *= 0.01f;
 809       }
 810     }
 811
 812     return nodeDef;
 813   }());
 814   if(!weakNode)
 815   {
 816     ExceptionFlinger(ASSERT_LOCATION) << "Node name '" << node.mName << "' is not unique; scene is invalid.";
 817   }
 818
 819   context.mNodeIndices.RegisterMapping(gltfIdx, idx);
 820
 821   Index skeletonIdx = node.mSkin ? node.mSkin.GetIndex() : INVALID_INDEX;
 822   if(node.mMesh)
 823   {
 824     auto&    mesh           = *node.mMesh;
 825     uint32_t primitiveCount = mesh.mPrimitives.size();
 826     auto     meshIdx        = context.mMeshIds[node.mMesh.GetIndex()];
 827     weakNode->mRenderables.reserve(primitiveCount);
 828     for(uint32_t i = 0; i < primitiveCount; ++i)
 829     {
 830       std::unique_ptr<NodeDefinition::Renderable> renderable;
 831       auto                                        modelRenderable = MakeModelRenderable(mesh.mPrimitives[i], context);
 832       modelRenderable->mMeshIdx                                   = meshIdx + i;
 833
 834       DALI_ASSERT_DEBUG(resources.mMeshes[modelRenderable->mMeshIdx].first.mSkeletonIdx == INVALID_INDEX ||
 835                         resources.mMeshes[modelRenderable->mMeshIdx].first.mSkeletonIdx == skeletonIdx);
 836       resources.mMeshes[modelRenderable->mMeshIdx].first.mSkeletonIdx = skeletonIdx;
 837
 838       renderable.reset(modelRenderable);
 839       weakNode->mRenderables.push_back(std::move(renderable));
 840     }
 841   }
 842
 843   if(node.mCamera)
 844   {
 845     CameraParameters camParams;
 846     ConvertCamera(*node.mCamera, camParams);
 847
 848     camParams.matrix.SetTransformComponents(node.mScale, node.mRotation, node.mTranslation);
 849     output.mCameraParameters.push_back(camParams);
 850   }
 851
 852   for(auto& n : node.mChildren)
 853   {
 854     ConvertNode(*n, n.GetIndex(), idx, context, isMRendererModel);
 855   }
 856 }
 857
 858 void ConvertSceneNodes(const gt::Scene& scene, ConversionContext& context, bool isMRendererModel)
 859 {
 860   auto& outScene = context.mOutput.mScene;
 861   Index rootIdx  = outScene.GetNodeCount();
 862   switch(scene.mNodes.size())
 863   {
 864     case 0:
 865       break;
 866
 867     case 1:
 868       ConvertNode(*scene.mNodes[0], scene.mNodes[0].GetIndex(), INVALID_INDEX, context, isMRendererModel);
 869       outScene.AddRootNode(rootIdx);
 870       break;
 871
 872     default:
 873     {
 874       std::unique_ptr<NodeDefinition> sceneRoot{new NodeDefinition()};
 875       sceneRoot->mName = "GLTF_LOADER_SCENE_ROOT_" + std::to_string(outScene.GetRoots().size());
 876
 877       outScene.AddNode(std::move(sceneRoot));
 878       outScene.AddRootNode(rootIdx);
 879
 880       for(auto& n : scene.mNodes)
 881       {
 882         ConvertNode(*n, n.GetIndex(), rootIdx, context, isMRendererModel);
 883       }
 884       break;
 885     }
 886   }
 887 }
 888
 889 void ConvertNodes(const gt::Document& doc, ConversionContext& context, bool isMRendererModel)
 890 {
 891   ConvertSceneNodes(*doc.mScene, context, isMRendererModel);
 892
 893   for(uint32_t i = 0, i1 = doc.mScene.GetIndex(); i < i1; ++i)
 894   {
 895     ConvertSceneNodes(doc.mScenes[i], context, isMRendererModel);
 896   }
 897
 898   for(uint32_t i = doc.mScene.GetIndex() + 1; i < doc.mScenes.size(); ++i)
 899   {
 900     ConvertSceneNodes(doc.mScenes[i], context, isMRendererModel);
 901   }
 902 }
 903
 904 template<typename T>
 905 void LoadDataFromAccessor(const std::string& path, Vector<T>& dataBuffer, uint32_t offset, uint32_t size)
 906 {
 907   std::ifstream animationBinaryFile(path, std::ifstream::binary);
 908
 909   if(!animationBinaryFile.is_open())
 910   {
 911     throw std::runtime_error("Failed to load " + path);
 912   }
 913
 914   animationBinaryFile.seekg(offset);
 915   animationBinaryFile.read(reinterpret_cast<char*>(dataBuffer.Begin()), size);
 916   animationBinaryFile.close();
 917 }
 918
 919 template<typename T>
 920 float LoadDataFromAccessors(const std::string& path, const gltf2::Accessor& input, const gltf2::Accessor& output, Vector<float>& inputDataBuffer, Vector<T>& outputDataBuffer)
 921 {
 922   inputDataBuffer.Resize(input.mCount);
 923   outputDataBuffer.Resize(output.mCount);
 924
 925   const uint32_t inputDataBufferSize  = input.GetBytesLength();
 926   const uint32_t outputDataBufferSize = output.GetBytesLength();
 927
 928   LoadDataFromAccessor<float>(path + std::string(input.mBufferView->mBuffer->mUri), inputDataBuffer, input.mBufferView->mByteOffset + input.mByteOffset, inputDataBufferSize);
 929   LoadDataFromAccessor<T>(path + std::string(output.mBufferView->mBuffer->mUri), outputDataBuffer, output.mBufferView->mByteOffset + output.mByteOffset, outputDataBufferSize);
 930   ApplyAccessorMinMax(output, reinterpret_cast<float*>(outputDataBuffer.begin()));
 931
 932   return inputDataBuffer[input.mCount - 1u];
 933 }
 934
 935 template<typename T>
 936 float LoadKeyFrames(const std::string& path, const gt::Animation::Channel& channel, KeyFrames& keyFrames, gt::Animation::Channel::Target::Type type)
 937 {
 938   const gltf2::Accessor& input  = *channel.mSampler->mInput;
 939   const gltf2::Accessor& output = *channel.mSampler->mOutput;
 940
 941   Vector<float> inputDataBuffer;
 942   Vector<T>     outputDataBuffer;
 943
 944   const float duration = LoadDataFromAccessors<T>(path, input, output, inputDataBuffer, outputDataBuffer);
 945
 946   for(uint32_t i = 0; i < input.mCount; ++i)
 947   {
 948     keyFrames.Add(inputDataBuffer[i] / duration, outputDataBuffer[i]);
 949   }
 950
 951   return duration;
 952 }
 953
 954 float LoadBlendShapeKeyFrames(const std::string& path, const gt::Animation::Channel& channel, const std::string& nodeName, uint32_t& propertyIndex, std::vector<Dali::Scene3D::Loader::AnimatedProperty>& properties)
 955 {
 956   const gltf2::Accessor& input  = *channel.mSampler->mInput;
 957   const gltf2::Accessor& output = *channel.mSampler->mOutput;
 958
 959   Vector<float> inputDataBuffer;
 960   Vector<float> outputDataBuffer;
 961
 962   const float duration = LoadDataFromAccessors<float>(path, input, output, inputDataBuffer, outputDataBuffer);
 963
 964   char        weightNameBuffer[32];
 965   auto        prefixSize    = snprintf(weightNameBuffer, sizeof(weightNameBuffer), "%s[", BLEND_SHAPE_WEIGHTS_UNIFORM.c_str());
 966   char* const pWeightName   = weightNameBuffer + prefixSize;
 967   const auto  remainingSize = sizeof(weightNameBuffer) - prefixSize;
 968   for(uint32_t weightIndex = 0u, endWeightIndex = channel.mSampler->mOutput->mCount / channel.mSampler->mInput->mCount; weightIndex < endWeightIndex; ++weightIndex)
 969   {
 970     AnimatedProperty& animatedProperty = properties[propertyIndex++];
 971
 972     animatedProperty.mNodeName = nodeName;
 973     snprintf(pWeightName, remainingSize, "%d]", weightIndex);
 974     animatedProperty.mPropertyName = std::string(weightNameBuffer);
 975
 976     animatedProperty.mKeyFrames = KeyFrames::New();
 977     for(uint32_t i = 0; i < input.mCount; ++i)
 978     {
 979       animatedProperty.mKeyFrames.Add(inputDataBuffer[i] / duration, outputDataBuffer[i * endWeightIndex + weightIndex]);
 980     }
 981
 982     animatedProperty.mTimePeriod = {0.f, duration};
 983   }
 984
 985   return duration;
 986 }
 987
 988 void ConvertAnimations(const gt::Document& doc, ConversionContext& context)
 989 {
 990   auto& output = context.mOutput;
 991
 992   output.mAnimationDefinitions.reserve(output.mAnimationDefinitions.size() + doc.mAnimations.size());
 993
 994   for(const auto& animation : doc.mAnimations)
 995   {
 996     AnimationDefinition animationDef;
 997
 998     if(!animation.mName.empty())
 999     {
1000       animationDef.mName = animation.mName;
1001     }
1002
1003     uint32_t numberOfProperties = 0u;
1004
1005     for(const auto& channel : animation.mChannels)
1006     {
1007       numberOfProperties += channel.mSampler->mOutput->mCount;
1008     }
1009     animationDef.mProperties.resize(numberOfProperties);
1010
1011     Index propertyIndex = 0u;
1012     for(const auto& channel : animation.mChannels)
1013     {
1014       std::string nodeName;
1015       if(!channel.mTarget.mNode->mName.empty())
1016       {
1017         nodeName = channel.mTarget.mNode->mName;
1018       }
1019       else
1020       {
1021         Index index = context.mNodeIndices.GetRuntimeId(channel.mTarget.mNode.GetIndex());
1022         nodeName    = context.mOutput.mScene.GetNode(index)->mName;
1023       }
1024
1025       float duration = 0.f;
1026
1027       switch(channel.mTarget.mPath)
1028       {
1029         case gt::Animation::Channel::Target::TRANSLATION:
1030         {
1031           AnimatedProperty& animatedProperty = animationDef.mProperties[propertyIndex];
1032
1033           animatedProperty.mNodeName     = nodeName;
1034           animatedProperty.mPropertyName = POSITION_PROPERTY;
1035
1036           animatedProperty.mKeyFrames = KeyFrames::New();
1037           duration                    = LoadKeyFrames<Vector3>(context.mPath, channel, animatedProperty.mKeyFrames, channel.mTarget.mPath);
1038
1039           animatedProperty.mTimePeriod = {0.f, duration};
1040           break;
1041         }
1042         case gt::Animation::Channel::Target::ROTATION:
1043         {
1044           AnimatedProperty& animatedProperty = animationDef.mProperties[propertyIndex];
1045
1046           animatedProperty.mNodeName     = nodeName;
1047           animatedProperty.mPropertyName = ORIENTATION_PROPERTY;
1048
1049           animatedProperty.mKeyFrames = KeyFrames::New();
1050           duration                    = LoadKeyFrames<Quaternion>(context.mPath, channel, animatedProperty.mKeyFrames, channel.mTarget.mPath);
1051
1052           animatedProperty.mTimePeriod = {0.f, duration};
1053           break;
1054         }
1055         case gt::Animation::Channel::Target::SCALE:
1056         {
1057           AnimatedProperty& animatedProperty = animationDef.mProperties[propertyIndex];
1058
1059           animatedProperty.mNodeName     = nodeName;
1060           animatedProperty.mPropertyName = SCALE_PROPERTY;
1061
1062           animatedProperty.mKeyFrames = KeyFrames::New();
1063           duration                    = LoadKeyFrames<Vector3>(context.mPath, channel, animatedProperty.mKeyFrames, channel.mTarget.mPath);
1064
1065           animatedProperty.mTimePeriod = {0.f, duration};
1066           break;
1067         }
1068         case gt::Animation::Channel::Target::WEIGHTS:
1069         {
1070           duration = LoadBlendShapeKeyFrames(context.mPath, channel, nodeName, propertyIndex, animationDef.mProperties);
1071
1072           break;
1073         }
1074         default:
1075         {
1076           // nothing to animate.
1077           break;
1078         }
1079       }
1080
1081       animationDef.mDuration = std::max(duration, animationDef.mDuration);
1082
1083       ++propertyIndex;
1084     }
1085
1086     output.mAnimationDefinitions.push_back(std::move(animationDef));
1087   }
1088 }
1089
1090 void ProcessSkins(const gt::Document& doc, ConversionContext& context)
1091 {
1092   // https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#skininversebindmatrices
1093   // If an inverseBindMatrices accessor was provided, we'll load the joint data from the buffer,
1094   // otherwise we'll set identity matrices for inverse bind pose.
1095   struct IInverseBindMatrixProvider
1096   {
1097     virtual ~IInverseBindMatrixProvider()
1098     {
1099     }
1100     virtual void Provide(Matrix& ibm) = 0;
1101   };
1102
1103   struct InverseBindMatrixAccessor : public IInverseBindMatrixProvider
1104   {
1105     std::ifstream  mStream;
1106     const uint32_t mElementSizeBytes;
1107
1108     InverseBindMatrixAccessor(const gt::Accessor& accessor, const std::string& path)
1109     : mStream(path + std::string(accessor.mBufferView->mBuffer->mUri), std::ios::binary),
1110       mElementSizeBytes(accessor.GetElementSizeBytes())
1111     {
1112       DALI_ASSERT_ALWAYS(mStream);
1113       DALI_ASSERT_DEBUG(accessor.mType == gt::AccessorType::MAT4 && accessor.mComponentType == gt::Component::FLOAT);
1114
1115       mStream.seekg(accessor.mBufferView->mByteOffset + accessor.mByteOffset);
1116     }
1117
1118     virtual void Provide(Matrix& ibm) override
1119     {
1120       DALI_ASSERT_ALWAYS(mStream.read(reinterpret_cast<char*>(ibm.AsFloat()), mElementSizeBytes));
1121     }
1122   };
1123
1124   struct DefaultInverseBindMatrixProvider : public IInverseBindMatrixProvider
1125   {
1126     virtual void Provide(Matrix& ibm) override
1127     {
1128       ibm = Matrix::IDENTITY;
1129     }
1130   };
1131
1132   auto& resources = context.mOutput.mResources;
1133   resources.mSkeletons.reserve(doc.mSkins.size());
1134
1135   for(auto& s : doc.mSkins)
1136   {
1137     std::unique_ptr<IInverseBindMatrixProvider> ibmProvider;
1138     if(s.mInverseBindMatrices)
1139     {
1140       ibmProvider.reset(new InverseBindMatrixAccessor(*s.mInverseBindMatrices, context.mPath));
1141     }
1142     else
1143     {
1144       ibmProvider.reset(new DefaultInverseBindMatrixProvider());
1145     }
1146
1147     SkeletonDefinition skeleton;
1148     if(s.mSkeleton.GetIndex() != INVALID_INDEX)
1149     {
1150       skeleton.mRootNodeIdx = context.mNodeIndices.GetRuntimeId(s.mSkeleton.GetIndex());
1151     }
1152
1153     skeleton.mJoints.resize(s.mJoints.size());
1154     auto iJoint = skeleton.mJoints.begin();
1155     for(auto& j : s.mJoints)
1156     {
1157       iJoint->mNodeIdx = context.mNodeIndices.GetRuntimeId(j.GetIndex());
1158
1159       ibmProvider->Provide(iJoint->mInverseBindMatrix);
1160
1161       ++iJoint;
1162     }
1163
1164     resources.mSkeletons.push_back(std::move(skeleton));
1165   }
1166 }
1167
1168 void ProduceShaders(ShaderDefinitionFactory& shaderFactory, SceneDefinition& scene)
1169 {
1170   uint32_t nodeCount = scene.GetNodeCount();
1171   for(uint32_t i = 0; i < nodeCount; ++i)
1172   {
1173     auto nodeDef = scene.GetNode(i);
1174     for(auto& renderable : nodeDef->mRenderables)
1175     {
1176       if(shaderFactory.ProduceShader(*renderable) == INVALID_INDEX)
1177       {
1178         DALI_LOG_ERROR("Fail to produce shader\n");
1179       }
1180     }
1181   }
1182 }
1183
1184 void SetObjectReaders()
1185 {
1186   js::SetObjectReader(BUFFER_READER);
1187   js::SetObjectReader(BUFFER_VIEW_READER);
1188   js::SetObjectReader(BUFFER_VIEW_CLIENT_READER);
1189   js::SetObjectReader(COMPONENT_TYPED_BUFFER_VIEW_CLIENT_READER);
1190   js::SetObjectReader(ACCESSOR_SPARSE_READER);
1191   js::SetObjectReader(ACCESSOR_READER);
1192   js::SetObjectReader(IMAGE_READER);
1193   js::SetObjectReader(SAMPLER_READER);
1194   js::SetObjectReader(TEXURE_READER);
1195   js::SetObjectReader(TEXURE_INFO_READER);
1196   js::SetObjectReader(MATERIAL_PBR_READER);
1197   js::SetObjectReader(MATERIAL_SPECULAR_READER);
1198   js::SetObjectReader(MATERIAL_IOR_READER);
1199   js::SetObjectReader(MATERIAL_EXTENSION_READER);
1200   js::SetObjectReader(MATERIAL_READER);
1201   js::SetObjectReader(MESH_PRIMITIVE_READER);
1202   js::SetObjectReader(MESH_READER);
1203   js::SetObjectReader(SKIN_READER);
1204   js::SetObjectReader(CAMERA_PERSPECTIVE_READER);
1205   js::SetObjectReader(CAMERA_ORTHOGRAPHIC_READER);
1206   js::SetObjectReader(CAMERA_READER);
1207   js::SetObjectReader(NODE_READER);
1208   js::SetObjectReader(ANIMATION_SAMPLER_READER);
1209   js::SetObjectReader(ANIMATION_TARGET_READER);
1210   js::SetObjectReader(ANIMATION_CHANNEL_READER);
1211   js::SetObjectReader(ANIMATION_READER);
1212   js::SetObjectReader(SCENE_READER);
1213 }
1214
1215 void SetDefaultEnvironmentMap(const gt::Document& doc, ConversionContext& context)
1216 {
1217   EnvironmentDefinition envDef;
1218   envDef.mUseBrdfTexture = true;
1219   envDef.mIblIntensity   = Scene3D::Loader::EnvironmentDefinition::GetDefaultIntensity();
1220   context.mOutput.mResources.mEnvironmentMaps.push_back({std::move(envDef), EnvironmentDefinition::Textures()});
1221 }
1222
1223 } // namespace
1224
1225 void LoadGltfScene(const std::string& url, ShaderDefinitionFactory& shaderFactory, LoadResult& params)
1226 {
1227   bool failed = false;
1228   auto js     = LoadTextFile(url.c_str(), &failed);
1229   if(failed)
1230   {
1231     throw std::runtime_error("Failed to load " + url);
1232   }
1233
1234   json::unique_ptr root(json_parse(js.c_str(), js.size()));
1235   if(!root)
1236   {
1237     throw std::runtime_error("Failed to parse " + url);
1238   }
1239
1240   static bool setObjectReaders = true;
1241   if(setObjectReaders)
1242   {
1243     // NOTE: only referencing own, anonymous namespace, const objects; the pointers will never need to change.
1244     SetObjectReaders();
1245     setObjectReaders = false;
1246   }
1247
1248   gt::Document doc;
1249
1250   auto& rootObj = js::Cast<json_object_s>(*root);
1251   auto  jsAsset = js::FindObjectChild("asset", rootObj);
1252
1253   auto jsAssetVersion = js::FindObjectChild("version", js::Cast<json_object_s>(*jsAsset));
1254   if(jsAssetVersion)
1255   {
1256     doc.mAsset.mVersion = js::Read::StringView(*jsAssetVersion);
1257   }
1258
1259   bool isMRendererModel(false);
1260   auto jsAssetGenerator = js::FindObjectChild("generator", js::Cast<json_object_s>(*jsAsset));
1261   if(jsAssetGenerator)
1262   {
1263     doc.mAsset.mGenerator = js::Read::StringView(*jsAssetGenerator);
1264     isMRendererModel      = (doc.mAsset.mGenerator.find(MRENDERER_MODEL_IDENTIFICATION) != std::string_view::npos);
1265   }
1266
1267   gt::SetRefReaderObject(doc);
1268   DOCUMENT_READER.Read(rootObj, doc);
1269
1270   auto              path = url.substr(0, url.rfind('/') + 1);
1271   ConversionContext context{params, path, INVALID_INDEX};
1272
1273   ConvertMaterials(doc, context);
1274   ConvertMeshes(doc, context);
1275   ConvertNodes(doc, context, isMRendererModel);
1276   ConvertAnimations(doc, context);
1277   ProcessSkins(doc, context);
1278   ProduceShaders(shaderFactory, params.mScene);
1279   params.mScene.EnsureUniqueSkinningShaderInstances(params.mResources);
1280
1281   // Set Default Environment map
1282   SetDefaultEnvironmentMap(doc, context);
1283 }
1284
1285 } // namespace Loader
1286 } // namespace Scene3D
1287 } // namespace Dali