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/files/file_path.h"
+#include "base/files/file_util.h"
+#include "base/json/json_file_value_serializer.h"
+#include "base/memory/ptr_util.h"
+#include "base/path_service.h"
+#include "base/values.h"
+#include "chrome/browser/android/vr_shell/test/paths.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace vr_shell {
+
+TEST(GltfParser, Parse) {
+  test::RegisterPathProvider();
+  base::FilePath gltf_path;
+  PathService::Get(test::DIR_TEST_DATA, &gltf_path);
+  gltf_path = gltf_path.Append("sample_inline.gltf");
+
+  int error_code;
+  std::string error_msg;
+  JSONFileValueDeserializer json_deserializer(gltf_path);
+  auto asset_value = json_deserializer.Deserialize(&error_code, &error_msg);
+  EXPECT_NE(nullptr, asset_value);
+  base::DictionaryValue* asset;
+  EXPECT_TRUE(asset_value->GetAsDictionary(&asset));
+
+  GltfParser parser;
+  auto gltf_model = parser.Parse(*asset);
+  EXPECT_TRUE(gltf_model);
+
+  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->GetMainScene());
+}
+
+}  // namespace vr_shell