Rendering Daydream controller in a fixed position.

chrome/browser/android/vr_shell/vr_controller_model.cc

Index: chrome/browser/android/vr_shell/vr_controller_model.cc
diff --git a/chrome/browser/android/vr_shell/vr_controller_model.cc b/chrome/browser/android/vr_shell/vr_controller_model.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a0a60d3094a7622db648c57263a78a2af76387db
--- /dev/null
+++ b/chrome/browser/android/vr_shell/vr_controller_model.cc
@@ -0,0 +1,168 @@
+// 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/vr_controller_model.h"
+
+#include "base/files/file_path.h"
+#include "base/files/file_util.h"
+#include "base/memory/ptr_util.h"
+#include "base/path_service.h"
+#include "chrome/browser/android/vr_shell/gltf_parser.h"
+#include "components/component_updater/component_updater_paths.h"
+#include "ui/gfx/codec/png_codec.h"
+
+namespace vr_shell {
+
+namespace {
+
+enum {
+  ELEMENTS_BUFFER_ID = 0,
+  INDICES_BUFFER_ID = 1,
+};
+
+constexpr char kPosition[] = "POSITION";
+constexpr char kTexCoord[] = "TEXCOORD_0";
+
+}  // namespace
+
+constexpr char const VrControllerModel::kComponentName[];
+constexpr char const VrControllerModel::kDefaultVersion[];
+constexpr char const VrControllerModel::kModelsDirectory[];
+constexpr char const VrControllerModel::kModelFilename[];
+constexpr char const VrControllerModel::kTexturesDirectory[];
+constexpr char const* VrControllerModel::kTextureFilenames[];
+
+VrControllerModel::VrControllerModel(
+    std::unique_ptr<gltf::Asset> gltf_asset,
+    std::vector<std::unique_ptr<gltf::Buffer>> buffers)
+    : gltf_asset_(std::move(gltf_asset)),
+      texture_bitmaps_(State::STATE_COUNT),
+      buffers_(std::move(buffers)) {}
+
+VrControllerModel::~VrControllerModel() = default;
+
+const GLvoid* VrControllerModel::ElementsBuffer() const {
+  const gltf::BufferView* buffer_view =
+      gltf_asset_->GetBufferView(ELEMENTS_BUFFER_ID);
+  DCHECK(buffer_view && buffer_view->target == GL_ARRAY_BUFFER);
+  const char* buffer = Buffer();
+  return buffer ? buffer + buffer_view->byte_offset : nullptr;
+}
+
+GLsizeiptr VrControllerModel::ElementsBufferSize() const {
+  const gltf::BufferView* buffer_view =
+      gltf_asset_->GetBufferView(ELEMENTS_BUFFER_ID);
+  DCHECK(buffer_view && buffer_view->target == GL_ARRAY_BUFFER);
+  return buffer_view->byte_length;
+}
+
+const GLvoid* VrControllerModel::IndicesBuffer() const {
+  const gltf::BufferView* buffer_view =
+      gltf_asset_->GetBufferView(INDICES_BUFFER_ID);
+  DCHECK(buffer_view && buffer_view->target == GL_ELEMENT_ARRAY_BUFFER);
+  const char* buffer = Buffer();
+  return buffer ? buffer + buffer_view->byte_offset : nullptr;
+}
+
+GLsizeiptr VrControllerModel::IndicesBufferSize() const {
+  const gltf::BufferView* buffer_view =
+      gltf_asset_->GetBufferView(INDICES_BUFFER_ID);
+  DCHECK(buffer_view && buffer_view->target == GL_ELEMENT_ARRAY_BUFFER);
+  return buffer_view->byte_length;
+}
+
+GLenum VrControllerModel::DrawMode() const {
+  const gltf::Mesh* mesh = gltf_asset_->GetMesh(0);
+  DCHECK(mesh && mesh->primitives.size());
+  return mesh->primitives[0]->mode;
+}
+
+const gltf::Accessor* VrControllerModel::IndicesAccessor() const {
+  const gltf::Mesh* mesh = gltf_asset_->GetMesh(0);
+  DCHECK(mesh && mesh->primitives.size());
+  return mesh->primitives[0]->indices;
+}
+
+const gltf::Accessor* VrControllerModel::PositionAccessor() const {
+  return Accessor(kPosition);
+}
+
+const gltf::Accessor* VrControllerModel::TextureCoordinateAccessor() const {
+  return Accessor(kTexCoord);
+}
+
+void VrControllerModel::SetTexture(int state,
+                                   std::unique_ptr<SkBitmap> bitmap) {
+  DCHECK(state >= 0 && state < STATE_COUNT);
+  texture_bitmaps_[state] = std::move(bitmap);
+}
+
+const SkBitmap* VrControllerModel::GetTexture(int state) const {
+  DCHECK(state >= 0 && state < STATE_COUNT);
+  return texture_bitmaps_[state].get();
+}
+
+const char* VrControllerModel::Buffer() const {
+  if (buffers_.empty())
+    return nullptr;
+  return buffers_[0]->data();
+}
+
+const gltf::Accessor* VrControllerModel::Accessor(
+    const std::string& key) const {
+  const gltf::Mesh* mesh = gltf_asset_->GetMesh(0);
+  DCHECK(mesh && mesh->primitives.size());
+  auto it = mesh->primitives[0]->attributes.find(key);
+  DCHECK(it != mesh->primitives[0]->attributes.begin());
+  return it->second;
+}
+
+std::unique_ptr<VrControllerModel> VrControllerModel::LoadFromComponent() {
+  base::FilePath models_path;
+  PathService::Get(component_updater::DIR_COMPONENT_USER, &models_path);
+  models_path = models_path.Append(VrControllerModel::kComponentName)
+                    .Append(VrControllerModel::kDefaultVersion)
+                    .Append(VrControllerModel::kModelsDirectory);
+  auto model_path = models_path.Append(VrControllerModel::kModelFilename);
+
+  // No further action if model file is not present
+  if (!base::PathExists(model_path)) {
+    LOG(WARNING) << "Controller model files not found";
+    return nullptr;
+  }
+
+  GltfParser gltf_parser;
+  std::vector<std::unique_ptr<gltf::Buffer>> buffers;
+  auto asset = gltf_parser.Parse(model_path, &buffers);
+  if (!asset) {
+    LOG(ERROR) << "Failed to read controller model";
+    return nullptr;
+  }
+
+  auto controller_model =
+      base::MakeUnique<VrControllerModel>(std::move(asset), std::move(buffers));
+
+  auto textures_path =
+      models_path.Append(VrControllerModel::kTexturesDirectory);
+
+  for (int i = 0; i < VrControllerModel::STATE_COUNT; i++) {
+    auto texture_path =
+        textures_path.Append(VrControllerModel::kTextureFilenames[i]);
+    std::string data;
+    auto bitmap = base::MakeUnique<SkBitmap>();
+    if (!base::ReadFileToString(texture_path, &data) ||
+        !gfx::PNGCodec::Decode(
+            reinterpret_cast<const unsigned char*>(data.data()), data.size(),
+            bitmap.get()) ||
+        bitmap->colorType() != kRGBA_8888_SkColorType) {
+      LOG(ERROR) << "Failed to read controller texture";
+      return nullptr;
+    }
+    controller_model->SetTexture(i, std::move(bitmap));
+  }
+
+  return controller_model;
+}
+
+}  // namespace vr_shell