Implementing glTF 1.0 parser

chrome/browser/android/vr_shell/gltf_parser_unittest.cc

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/android/vr_shell/gltf_parser.h"
+
+#include <memory>
+
+#include "base/memory/ptr_util.h"
+#include "base/values.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace vr_shell {
+
+TEST(GltfParser, Parse) {
+  base::DictionaryValue asset;
+  asset.SetString("asset.version", "1.0");
+
+  auto buffers = base::MakeUnique<base::DictionaryValue>();
+  auto buffer_dict = base::MakeUnique<base::DictionaryValue>();
+  buffer_dict->SetString(
+      "uri", "data:application/octet-stream;base64,SEVMTE8gV09STEQh");
+  buffer_dict->SetInteger("byteLength", 12);
+  buffers->Set("dummyBuffer", std::move(buffer_dict));
+  asset.Set("buffers", std::move(buffers));
+
+  auto buffer_views = base::MakeUnique<base::DictionaryValue>();
+  auto buffer_view_dict = base::MakeUnique<base::DictionaryValue>();
+  buffer_view_dict->SetString("buffer", "dummyBuffer");
+  buffer_view_dict->SetInteger("byteLength", 20);
+  buffer_view_dict->SetInteger("byteOffset", 10);
+  buffer_view_dict->SetInteger("target", 1);
+  buffer_views->Set("dummyBufferView", std::move(buffer_view_dict));
+  asset.Set("bufferViews", std::move(buffer_views));
+
+  auto accessors = base::MakeUnique<base::DictionaryValue>();
+  auto accessor_dict = base::MakeUnique<base::DictionaryValue>();
+  accessor_dict->SetString("bufferView", "dummyBufferView");
+  accessor_dict->SetInteger("byteOffset", 10);
+  accessor_dict->SetInteger("byteStride", 16);
+  accessor_dict->SetInteger("componentType", 5);
+  accessor_dict->SetInteger("count", 24);
+  accessor_dict->SetString("type", "VEC3");
+  accessors->Set("dummyAccessor", std::move(accessor_dict));
+  asset.Set("accessors", std::move(accessors));
+
+  auto meshes = base::MakeUnique<base::DictionaryValue>();
+  auto mesh_dict = base::MakeUnique<base::DictionaryValue>();
+  auto primitive_list = base::MakeUnique<base::ListValue>();
+  auto primitive_dict = base::MakeUnique<base::DictionaryValue>();
+  auto attributes_dict = base::MakeUnique<base::DictionaryValue>();
+  attributes_dict->SetString("POSITION", "dummyAccessor");
+  primitive_dict->Set("attributes", std::move(attributes_dict));
+  primitive_dict->SetString("indices", "dummyAccessor");
+  primitive_dict->SetInteger("mode", 4);
+  primitive_list->Append(std::move(primitive_dict));
+  mesh_dict->Set("primitives", std::move(primitive_list));
+  meshes->Set("dummyMesh", std::move(mesh_dict));
+  asset.Set("meshes", std::move(meshes));
+
+  auto nodes = base::MakeUnique<base::DictionaryValue>();
+  auto node_dict = base::MakeUnique<base::DictionaryValue>();
+  auto children_list = base::MakeUnique<base::ListValue>();
+  children_list->AppendString("dummyNode2");
+  node_dict->Set("children", std::move(children_list));
+  nodes->Set("dummyNode1", std::move(node_dict));
+  node_dict = base::MakeUnique<base::DictionaryValue>();
+  auto mesh_list = base::MakeUnique<base::ListValue>();
+  mesh_list->AppendString("dummyMesh");
+  node_dict->Set("meshes", std::move(mesh_list));
+  nodes->Set("dummyNode2", std::move(node_dict));
+  asset.Set("nodes", std::move(nodes));
+
+  auto scenes = base::MakeUnique<base::DictionaryValue>();
+  auto scene_dict = base::MakeUnique<base::DictionaryValue>();
+  auto node_list = base::MakeUnique<base::ListValue>();
+  node_list->AppendString("dummyNode1");
+  scene_dict->Set("nodes", std::move(node_list));
+  scenes->Set("dummyScene", std::move(scene_dict));
+  asset.Set("scenes", std::move(scenes));
+
+  asset.SetString("scene", "dummyScene");
+
+  GltfParser parser;
+  auto gltf_model = parser.Parse(asset);
+
+  const gltf::Buffer* buffer = gltf_model->GetBuffer(0);
+  EXPECT_NE(nullptr, buffer);
+  EXPECT_EQ(nullptr, gltf_model->GetBuffer(1));
+  EXPECT_EQ("HELLO WORLD!", *buffer);
+  EXPECT_EQ(12u, buffer->length());
+
+  const gltf::BufferView* buffer_view = gltf_model->GetBufferView(0);
+  EXPECT_NE(nullptr, buffer_view);
+  EXPECT_EQ(nullptr, gltf_model->GetBufferView(1));
+  EXPECT_EQ(buffer, buffer_view->buffer);
+  EXPECT_EQ(20, buffer_view->byte_length);
+  EXPECT_EQ(10, buffer_view->byte_offset);
+  EXPECT_EQ(1, buffer_view->target);
+
+  const gltf::Accessor* accessor = gltf_model->GetAccessor(0);
+  EXPECT_NE(nullptr, accessor);
+  EXPECT_EQ(nullptr, gltf_model->GetAccessor(1));
+  EXPECT_EQ(buffer_view, accessor->buffer_view);
+  EXPECT_EQ(10, accessor->byte_offset);
+  EXPECT_EQ(16, accessor->byte_stride);
+  EXPECT_EQ(5, accessor->component_type);
+  EXPECT_EQ(24, accessor->count);
+  EXPECT_EQ(gltf::VEC3, accessor->type);
+
+  const gltf::Mesh* mesh = gltf_model->GetMesh(0);
+  EXPECT_NE(nullptr, mesh);
+  EXPECT_EQ(nullptr, gltf_model->GetAccessor(1));
+  EXPECT_EQ(1u, mesh->primitives.size());
+  gltf::Mesh::Primitive* primitive = mesh->primitives[0].get();
+  EXPECT_EQ(1u, primitive->attributes.size());
+  auto attr_it = primitive->attributes.begin();
+  EXPECT_EQ("POSITION", attr_it->first);
+  EXPECT_EQ(accessor, attr_it->second);
+  EXPECT_EQ(accessor, primitive->indices);
+  EXPECT_EQ(4, primitive->mode);
+
+  const gltf::Node* node_1 = gltf_model->GetNode(0);
+  const gltf::Node* node_2 = gltf_model->GetNode(1);
+  EXPECT_NE(nullptr, node_1);
+  EXPECT_NE(nullptr, node_2);
+  EXPECT_EQ(nullptr, gltf_model->GetNode(2));
+  EXPECT_EQ(1u, node_1->children.size());
+  EXPECT_EQ(0u, node_1->meshes.size());
+  EXPECT_EQ(node_2, node_1->children[0]);
+  EXPECT_EQ(0u, node_2->children.size());
+  EXPECT_EQ(1u, node_2->meshes.size());
+  EXPECT_EQ(mesh, node_2->meshes[0]);
+
+  const gltf::Scene* scene = gltf_model->GetScene(0);
+  EXPECT_NE(nullptr, scene);
+  EXPECT_EQ(nullptr, gltf_model->GetNode(2));
+  EXPECT_EQ(1u, scene->nodes.size());
+  EXPECT_EQ(node_1, scene->nodes[0]);
+
+  EXPECT_EQ(scene, gltf_model->GetScene());
+}
+
+}  // namespace vr_shell