Revert of command_buffer_gles2: Implement EGL default Display as a global object

gpu/gles2_conform_support/egl/display.cc

 // Copyright (c) 2012 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 "gpu/gles2_conform_support/egl/display.h"
 
+#include <stddef.h>
+#include <stdint.h>
+
+#include <vector>
+#include "base/at_exit.h"
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/lazy_instance.h"
+#include "gpu/command_buffer/client/gles2_implementation.h"
+#include "gpu/command_buffer/client/gles2_lib.h"
+#include "gpu/command_buffer/client/transfer_buffer.h"
+#include "gpu/command_buffer/common/value_state.h"
+#include "gpu/command_buffer/service/context_group.h"
+#include "gpu/command_buffer/service/mailbox_manager.h"
+#include "gpu/command_buffer/service/memory_tracking.h"
+#include "gpu/command_buffer/service/transfer_buffer_manager.h"
+#include "gpu/command_buffer/service/valuebuffer_manager.h"
 #include "gpu/gles2_conform_support/egl/config.h"
-#include "gpu/gles2_conform_support/egl/context.h"
 #include "gpu/gles2_conform_support/egl/surface.h"
-#include "gpu/gles2_conform_support/egl/thread_state.h"
+#include "gpu/gles2_conform_support/egl/test_support.h"
+
+namespace {
+const int32_t kCommandBufferSize = 1024 * 1024;
+const int32_t kTransferBufferSize = 512 * 1024;
+}
 
 namespace egl {
+#if defined(COMMAND_BUFFER_GLES_LIB_SUPPORT_ONLY)
+// egl::Display is used for comformance tests and command_buffer_gles.  We only
+// need the exit manager for the command_buffer_gles library.
+// TODO(hendrikw): Find a cleaner solution for this.
+namespace {
+base::LazyInstance<base::Lock>::Leaky g_exit_manager_lock;
+int g_exit_manager_use_count;
+base::AtExitManager* g_exit_manager;
+void RefAtExitManager() {
+  base::AutoLock lock(g_exit_manager_lock.Get());
+#if defined(COMPONENT_BUILD)
+  if (g_command_buffer_gles_has_atexit_manager) {
+    return;
+  }
+#endif
+  if (g_exit_manager_use_count == 0) {
+    g_exit_manager = new base::AtExitManager;
+  }
+  ++g_exit_manager_use_count;
+}
+void ReleaseAtExitManager() {
+  base::AutoLock lock(g_exit_manager_lock.Get());
+#if defined(COMPONENT_BUILD)
+  if (g_command_buffer_gles_has_atexit_manager) {
+    return;
+  }
+#endif
+  --g_exit_manager_use_count;
+  if (g_exit_manager_use_count == 0) {
+    delete g_exit_manager;
+    g_exit_manager = nullptr;
+  }
+}
+}
+#endif
 
-Display::Display()
-    : is_initialized_(false),
-      next_create_window_surface_creates_pbuffer_(false),
-      window_surface_pbuffer_width_(0),
-      window_surface_pbuffer_height_(0) {}
+Display::Display(EGLNativeDisplayType display_id)
+    : display_id_(display_id),
+      is_initialized_(false),
+      create_offscreen_(false),
+      create_offscreen_width_(0),
+      create_offscreen_height_(0),
+      next_fence_sync_release_(1) {
+#if defined(COMMAND_BUFFER_GLES_LIB_SUPPORT_ONLY)
+  RefAtExitManager();
+#endif
+}
 
 Display::~Display() {
-  surfaces_.clear();
-  contexts_.clear();
-}
-void Display::SetNextCreateWindowSurfaceCreatesPBuffer(EGLint width,
-                                                       EGLint height) {
-  next_create_window_surface_creates_pbuffer_ = true;
-  window_surface_pbuffer_width_ = width;
-  window_surface_pbuffer_height_ = height;
+  gles2::Terminate();
+#if defined(COMMAND_BUFFER_GLES_LIB_SUPPORT_ONLY)
+  ReleaseAtExitManager();
+#endif
 }
 
-EGLBoolean Display::Initialize(ThreadState* ts, EGLint* major, EGLint* minor) {
-  base::AutoLock auto_lock(lock_);
+bool Display::Initialize() {
+  gles2::Initialize();
   is_initialized_ = true;
-
-  if (major)
-    *major = 1;
-  if (minor)
-    *minor = 4;
-  return ts->ReturnSuccess(EGL_TRUE);
+  return true;
 }
 
-EGLBoolean Display::Terminate(ThreadState* ts) {
-  base::AutoLock auto_lock(lock_);
-  is_initialized_ = false;
-  surfaces_.clear();
-  for (const auto& context : contexts_)
-    context->MarkDestroyed();
-  contexts_.clear();
-  return ts->ReturnSuccess(EGL_TRUE);
+bool Display::IsValidConfig(EGLConfig config) {
+  return (config != NULL) && (config == config_.get());
 }
 
-const char* Display::QueryString(ThreadState* ts, EGLint name) {
-  base::AutoLock auto_lock(lock_);
-  if (!is_initialized_)
-    return ts->ReturnError<const char*>(EGL_NOT_INITIALIZED, nullptr);
-  switch (name) {
-    case EGL_CLIENT_APIS:
-      return ts->ReturnSuccess("OpenGL_ES");
-    case EGL_EXTENSIONS:
-      return ts->ReturnSuccess("");
-    case EGL_VENDOR:
-      return ts->ReturnSuccess("Google Inc.");
-    case EGL_VERSION:
-      return ts->ReturnSuccess("1.4");
-    default:
-      return ts->ReturnError<const char*>(EGL_BAD_PARAMETER, nullptr);
+bool Display::ChooseConfigs(EGLConfig* configs,
+                            EGLint config_size,
+                            EGLint* num_config) {
+  // TODO(alokp): Find out a way to find all configs. CommandBuffer currently
+  // does not support finding or choosing configs.
+  *num_config = 1;
+  if (configs != NULL) {
+    if (config_ == NULL) {
+      config_.reset(new Config);
+    }
+    configs[0] = config_.get();
   }
+  return true;
 }
 
-EGLBoolean Display::ChooseConfig(ThreadState* ts,
-                                 const EGLint* attrib_list,
-                                 EGLConfig* configs,
-                                 EGLint config_size,
-                                 EGLint* num_config) {
-  base::AutoLock auto_lock(lock_);
-  if (!is_initialized_)
-    return ts->ReturnError(EGL_NOT_INITIALIZED, EGL_FALSE);
-  if (num_config == nullptr)
-    return ts->ReturnError(EGL_BAD_PARAMETER, EGL_FALSE);
-  if (!Config::ValidateAttributeList(attrib_list))
-    return ts->ReturnError(EGL_BAD_ATTRIBUTE, EGL_FALSE);
-  InitializeConfigsIfNeeded();
-  if (!configs)
-    config_size = 0;
-  *num_config = 0;
-  for (size_t i = 0; i < arraysize(configs_); ++i) {
-    if (configs_[i]->Matches(attrib_list)) {
-      if (*num_config < config_size) {
-        configs[*num_config] = configs_[i].get();
-      }
-      ++*num_config;
+bool Display::GetConfigs(EGLConfig* configs,
+                         EGLint config_size,
+                         EGLint* num_config) {
+  // TODO(alokp): Find out a way to find all configs. CommandBuffer currently
+  // does not support finding or choosing configs.
+  *num_config = 1;
+  if (configs != NULL) {
+    if (config_ == NULL) {
+      config_.reset(new Config);
     }
+    configs[0] = config_.get();
   }
-  return ts->ReturnSuccess(EGL_TRUE);
+  return true;
 }
 
-EGLBoolean Display::GetConfigs(ThreadState* ts,
-                               EGLConfig* configs,
-                               EGLint config_size,
-                               EGLint* num_config) {
-  base::AutoLock auto_lock(lock_);
-  if (!is_initialized_)
-    return ts->ReturnError(EGL_NOT_INITIALIZED, EGL_FALSE);
-  if (num_config == nullptr)
-    return ts->ReturnError(EGL_BAD_PARAMETER, EGL_FALSE);
-  InitializeConfigsIfNeeded();
-  if (!configs)
-    config_size = 0;
-  *num_config = arraysize(configs_);
-  size_t count =
-      std::min(arraysize(configs_), static_cast<size_t>(config_size));
-  for (size_t i = 0; i < count; ++i)
-    configs[i] = configs_[i].get();
-  return ts->ReturnSuccess(EGL_TRUE);
+bool Display::GetConfigAttrib(EGLConfig config,
+                              EGLint attribute,
+                              EGLint* value) {
+  const egl::Config* cfg = static_cast<egl::Config*>(config);
+  return cfg->GetAttrib(attribute, value);
 }
 
 bool Display::IsValidNativeWindow(EGLNativeWindowType win) {
 #if defined OS_WIN
   return ::IsWindow(win) != FALSE;
 #else
   // TODO(alokp): Validate window handle.
   return true;
 #endif  // OS_WIN
 }
 
-EGLBoolean Display::GetConfigAttrib(ThreadState* ts,
-                                    EGLConfig cfg,
-                                    EGLint attribute,
-                                    EGLint* value) {
-  base::AutoLock auto_lock(lock_);
-  if (!is_initialized_)
-    return ts->ReturnError(EGL_NOT_INITIALIZED, EGL_FALSE);
-  const egl::Config* config = GetConfig(cfg);
-  if (!config)
-    return ts->ReturnError(EGL_BAD_CONFIG, EGL_FALSE);
-  if (!config->GetAttrib(attribute, value))
-    return ts->ReturnError(EGL_BAD_ATTRIBUTE, EGL_FALSE);
-  return ts->ReturnSuccess(EGL_TRUE);
-}
-
-EGLSurface Display::CreatePbufferSurface(ThreadState* ts,
-                                         EGLConfig cfg,
-                                         const EGLint* attrib_list) {
-  base::AutoLock auto_lock(lock_);
-  if (!is_initialized_)
-    return ts->ReturnError(EGL_NOT_INITIALIZED, EGL_NO_SURFACE);
-  const egl::Config* config = GetConfig(cfg);
-  if (!config)
-    return ts->ReturnError(EGL_BAD_CONFIG, EGL_NO_SURFACE);
-  EGLint value = EGL_NONE;
-  config->GetAttrib(EGL_SURFACE_TYPE, &value);
-  if ((value & EGL_PBUFFER_BIT) == 0)
-    return ts->ReturnError(EGL_BAD_MATCH, EGL_NO_SURFACE);
-  if (!egl::Surface::ValidatePbufferAttributeList(attrib_list))
-    return ts->ReturnError(EGL_BAD_ATTRIBUTE, EGL_NO_SURFACE);
-
-  int width = 1;
-  int height = 1;
-  if (attrib_list) {
-    for (const int32_t* attr = attrib_list; attr[0] != EGL_NONE; attr += 2) {
-      switch (attr[0]) {
-        case EGL_WIDTH:
-          width = attr[1];
-          break;
-        case EGL_HEIGHT:
-          height = attr[1];
-          break;
-      }
-    }
-  }
-  return DoCreatePbufferSurface(ts, width, height);
-}
-
-EGLSurface Display::DoCreatePbufferSurface(ThreadState* ts,
-                                           EGLint width,
-                                           EGLint height) {
-  lock_.AssertAcquired();
-  scoped_refptr<gfx::GLSurface> gl_surface;
-  gl_surface =
-      gfx::GLSurface::CreateOffscreenGLSurface(gfx::Size(width, height));
-  if (!gl_surface)
-    return ts->ReturnError(EGL_BAD_ALLOC, nullptr);
-  surfaces_.emplace_back(new Surface(gl_surface.get()));
-  return ts->ReturnSuccess<EGLSurface>(surfaces_.back().get());
-}
-
-EGLSurface Display::CreateWindowSurface(ThreadState* ts,
-                                        EGLConfig cfg,
+bool Display::IsValidSurface(EGLSurface surface) {
+  return (surface != NULL) && (surface == surface_.get());
+}
+
+EGLSurface Display::CreateWindowSurface(EGLConfig config,
                                         EGLNativeWindowType win,
                                         const EGLint* attrib_list) {
-  base::AutoLock auto_lock(lock_);
-  if (!is_initialized_)
-    return ts->ReturnError(EGL_NOT_INITIALIZED, EGL_NO_SURFACE);
-  const egl::Config* config = GetConfig(cfg);
-  if (!config)
-    return ts->ReturnError(EGL_BAD_CONFIG, EGL_NO_SURFACE);
-  EGLint value = EGL_NONE;
-  config->GetAttrib(EGL_SURFACE_TYPE, &value);
-  if ((value & EGL_WINDOW_BIT) == 0)
-    return ts->ReturnError(EGL_BAD_CONFIG, EGL_NO_SURFACE);
-  if (!next_create_window_surface_creates_pbuffer_ && !IsValidNativeWindow(win))
-    return ts->ReturnError(EGL_BAD_NATIVE_WINDOW, EGL_NO_SURFACE);
-  if (!Surface::ValidateWindowAttributeList(attrib_list))
-    return ts->ReturnError(EGL_BAD_ATTRIBUTE, EGL_NO_SURFACE);
-  if (next_create_window_surface_creates_pbuffer_) {
-    next_create_window_surface_creates_pbuffer_ = false;
-    window_surface_pbuffer_width_ = 0;
-    window_surface_pbuffer_height_ = 0;
-    return DoCreatePbufferSurface(ts, window_surface_pbuffer_width_,
-                                  window_surface_pbuffer_height_);
-  }
-  scoped_refptr<gfx::GLSurface> gl_surface;
-  gl_surface = gfx::GLSurface::CreateViewGLSurface(win);
-  if (!gl_surface)
-    return ts->ReturnError(EGL_BAD_ALLOC, EGL_NO_SURFACE);
-  surfaces_.emplace_back(new Surface(gl_surface.get()));
-  return ts->ReturnSuccess(surfaces_.back().get());
-}
-
-EGLBoolean Display::DestroySurface(ThreadState* ts, EGLSurface sfe) {
-  base::AutoLock auto_lock(lock_);
-  if (!is_initialized_)
-    return ts->ReturnError(EGL_NOT_INITIALIZED, EGL_FALSE);
-  auto it = std::find(surfaces_.begin(), surfaces_.end(), sfe);
-  if (it == surfaces_.end())
-    return ts->ReturnError(EGL_BAD_SURFACE, EGL_FALSE);
-  surfaces_.erase(it);
-  return ts->ReturnSuccess(EGL_TRUE);
-}
-
-EGLBoolean Display::ReleaseCurrent(ThreadState* ts) {
-  base::AutoLock auto_lock(lock_);
-  if (!is_initialized_)
-    return ts->ReturnSuccess(EGL_TRUE);
-  ThreadState::AutoCurrentContextRestore accr(ts);
-  if (ts->current_context()) {
-    Context::MakeCurrent(ts->current_context(),
-                         ts->current_surface()->gl_surface(), nullptr, nullptr);
-    accr.SetCurrent(nullptr, nullptr);
-  }
-  return ts->ReturnSuccess(EGL_TRUE);
-}
-
-EGLBoolean Display::MakeCurrent(ThreadState* ts,
-                                EGLSurface draw,
-                                EGLSurface read,
-                                EGLSurface ctx) {
-  base::AutoLock auto_lock(lock_);
-  if (!is_initialized_)
-    return ts->ReturnError(EGL_NOT_INITIALIZED, EGL_FALSE);
-  ThreadState::AutoCurrentContextRestore accr(ts);
-  // Client might have called use because it changed some other gl binding
-  // global state. For example, the client might have called eglMakeCurrent on
-  // the same EGL as what command buffer uses. The client probably knows that
-  // this invalidates the internal state of command buffer, too. So reset the
-  // current context with accr in any case, regardless whether context or
-  // surface pointer changes.
-  Surface* new_surface = GetSurface(draw);
-  if (!new_surface)
-    return ts->ReturnError(EGL_BAD_SURFACE, EGL_FALSE);
-  new_surface = GetSurface(read);
-  if (!new_surface)
-    return ts->ReturnError(EGL_BAD_SURFACE, EGL_FALSE);
-  egl::Context* new_context = GetContext(ctx);
-  if (!new_context)
-    return ts->ReturnError(EGL_BAD_CONTEXT, EGL_FALSE);
-  if (draw != read)
-    return ts->ReturnError(EGL_BAD_MATCH, EGL_FALSE);
-
-  Surface* current_surface = ts->current_surface();
-  Context* current_context = ts->current_context();
-
-  if (current_context != new_context &&
-      new_context->is_current_in_some_thread())
-    return ts->ReturnError(EGL_BAD_ACCESS, EGL_FALSE);
-
-  if (current_surface != new_surface &&
-      new_surface->is_current_in_some_thread())
-    return ts->ReturnError(EGL_BAD_ACCESS, EGL_FALSE);
-
-  if (!Context::MakeCurrent(
-          current_context,
-          current_context ? current_surface->gl_surface() : nullptr,
-          new_context, new_context ? new_surface->gl_surface() : nullptr))
-    return ts->ReturnError(EGL_BAD_MATCH, EGL_FALSE);
-
-  accr.SetCurrent(new_surface, new_context);
-  return ts->ReturnSuccess(EGL_TRUE);
-}
-
-EGLBoolean Display::SwapBuffers(ThreadState* ts, EGLSurface sfe) {
-  base::AutoLock auto_lock(lock_);
-  if (!is_initialized_)
-    return ts->ReturnError(EGL_NOT_INITIALIZED, EGL_FALSE);
-  egl::Surface* surface = GetSurface(sfe);
-  if (!surface)
-    return ts->ReturnError(EGL_BAD_SURFACE, EGL_FALSE);
-  if (ts->current_surface() != surface)
-    return ts->ReturnError(EGL_BAD_SURFACE, EGL_FALSE);
-  ts->current_context()->FlushAndSwapBuffers(surface->gl_surface());
-  return ts->ReturnSuccess(EGL_TRUE);
-}
-
-EGLContext Display::CreateContext(ThreadState* ts,
-                                  EGLConfig cfg,
+  if (surface_ != NULL) {
+    // We do not support more than one window surface.
+    return EGL_NO_SURFACE;
+  }
+
+  {
+    gpu::TransferBufferManager* manager =
+        new gpu::TransferBufferManager(nullptr);
+    transfer_buffer_manager_ = manager;
+    manager->Initialize();
+  }
+  scoped_ptr<gpu::CommandBufferService> command_buffer(
+      new gpu::CommandBufferService(transfer_buffer_manager_.get()));
+  if (!command_buffer->Initialize())
+    return NULL;
+
+  scoped_refptr<gpu::gles2::ContextGroup> group(new gpu::gles2::ContextGroup(
+      gpu_preferences_, NULL, NULL,
+      new gpu::gles2::ShaderTranslatorCache(gpu_preferences_),
+      new gpu::gles2::FramebufferCompletenessCache, NULL, NULL, NULL, true));
+
+  decoder_.reset(gpu::gles2::GLES2Decoder::Create(group.get()));
+  if (!decoder_.get())
+    return EGL_NO_SURFACE;
+
+  executor_.reset(
+      new gpu::CommandExecutor(command_buffer.get(), decoder_.get(), NULL));
+
+  decoder_->set_engine(executor_.get());
+  gfx::Size size(create_offscreen_width_, create_offscreen_height_);
+  if (create_offscreen_) {
+    gl_surface_ = gfx::GLSurface::CreateOffscreenGLSurface(size);
+    create_offscreen_ = false;
+    create_offscreen_width_ = 0;
+    create_offscreen_height_ = 0;
+  } else {
+    gl_surface_ = gfx::GLSurface::CreateViewGLSurface(win);
+  }
+  if (!gl_surface_.get())
+    return EGL_NO_SURFACE;
+
+  gl_context_ = gfx::GLContext::CreateGLContext(NULL,
+                                                gl_surface_.get(),
+                                                gfx::PreferDiscreteGpu);
+  if (!gl_context_.get())
+    return EGL_NO_SURFACE;
+
+  gl_context_->MakeCurrent(gl_surface_.get());
+
+  EGLint depth_size = 0;
+  EGLint alpha_size = 0;
+  EGLint stencil_size = 0;
+  GetConfigAttrib(config, EGL_DEPTH_SIZE, &depth_size);
+  GetConfigAttrib(config, EGL_ALPHA_SIZE, &alpha_size);
+  GetConfigAttrib(config, EGL_STENCIL_SIZE, &stencil_size);
+  std::vector<int32_t> attribs;
+  attribs.push_back(EGL_DEPTH_SIZE);
+  attribs.push_back(depth_size);
+  attribs.push_back(EGL_ALPHA_SIZE);
+  attribs.push_back(alpha_size);
+  attribs.push_back(EGL_STENCIL_SIZE);
+  attribs.push_back(stencil_size);
+  // TODO(gman): Insert attrib_list. Although ES 1.1 says it must be null
+  attribs.push_back(EGL_NONE);
+
+  if (!decoder_->Initialize(gl_surface_.get(),
+                            gl_context_.get(),
+                            gl_surface_->IsOffscreen(),
+                            size,
+                            gpu::gles2::DisallowedFeatures(),
+                            attribs)) {
+    return EGL_NO_SURFACE;
+  }
+
+  command_buffer->SetPutOffsetChangeCallback(base::Bind(
+      &gpu::CommandExecutor::PutChanged, base::Unretained(executor_.get())));
+  command_buffer->SetGetBufferChangeCallback(base::Bind(
+      &gpu::CommandExecutor::SetGetBuffer, base::Unretained(executor_.get())));
+
+  scoped_ptr<gpu::gles2::GLES2CmdHelper> cmd_helper(
+      new gpu::gles2::GLES2CmdHelper(command_buffer.get()));
+  if (!cmd_helper->Initialize(kCommandBufferSize))
+    return NULL;
+
+  scoped_ptr<gpu::TransferBuffer> transfer_buffer(new gpu::TransferBuffer(
+      cmd_helper.get()));
+
+  command_buffer_.reset(command_buffer.release());
+  transfer_buffer_.reset(transfer_buffer.release());
+  gles2_cmd_helper_.reset(cmd_helper.release());
+  surface_.reset(new Surface(win));
+
+  return surface_.get();
+}
+
+void Display::DestroySurface(EGLSurface surface) {
+  DCHECK(IsValidSurface(surface));
+  executor_.reset();
+  if (decoder_.get()) {
+    decoder_->Destroy(true);
+  }
+  decoder_.reset();
+  gl_surface_ = NULL;
+  gl_context_ = NULL;
+  surface_.reset();
+}
+
+void Display::SwapBuffers(EGLSurface surface) {
+  DCHECK(IsValidSurface(surface));
+  context_->SwapBuffers();
+}
+
+bool Display::IsValidContext(EGLContext ctx) {
+  return (ctx != NULL) && (ctx == context_.get());
+}
+
+EGLContext Display::CreateContext(EGLConfig config,
                                   EGLContext share_ctx,
                                   const EGLint* attrib_list) {
-  base::AutoLock auto_lock(lock_);
-  if (!is_initialized_)
-    return ts->ReturnError(EGL_NOT_INITIALIZED, EGL_NO_CONTEXT);
-  if (share_ctx != EGL_NO_CONTEXT) {
-    egl::Context* share_context = GetContext(share_ctx);
-    if (!share_context)
-      return ts->ReturnError(EGL_BAD_CONTEXT, EGL_NO_CONTEXT);
-    // TODO(alokp): Add support for shared contexts.
-    return ts->ReturnError(EGL_BAD_MATCH, EGL_NO_CONTEXT);
-  }
-  if (!egl::Context::ValidateAttributeList(attrib_list))
-    return ts->ReturnError(EGL_BAD_ATTRIBUTE, EGL_NO_CONTEXT);
-  const egl::Config* config = GetConfig(cfg);
-  if (!config)
-    return ts->ReturnError(EGL_BAD_CONFIG, EGL_NO_CONTEXT);
-  scoped_refptr<Context> context(new Context(this, config));
-  if (!context)
-    return ts->ReturnError(EGL_BAD_ALLOC, EGL_NO_CONTEXT);
-  contexts_.emplace_back(context.get());
-  return ts->ReturnSuccess<EGLContext>(context.get());
-}
-
-EGLBoolean Display::DestroyContext(ThreadState* ts, EGLContext ctx) {
-  base::AutoLock auto_lock(lock_);
-  if (!is_initialized_)
-    return ts->ReturnError(EGL_NOT_INITIALIZED, EGL_FALSE);
-  auto it = std::find(contexts_.begin(), contexts_.end(), ctx);
-  if (it == contexts_.end())
-    return ts->ReturnError(EGL_BAD_CONTEXT, EGL_FALSE);
-  (*it)->MarkDestroyed();
-  contexts_.erase(it);
-  return ts->ReturnSuccess(EGL_TRUE);
+  DCHECK(IsValidConfig(config));
+  // TODO(alokp): Add support for shared contexts.
+  if (share_ctx != NULL)
+    return EGL_NO_CONTEXT;
+
+  DCHECK(command_buffer_ != NULL);
+  DCHECK(transfer_buffer_.get());
+
+  bool bind_generates_resources = true;
+  bool lose_context_when_out_of_memory = false;
+  bool support_client_side_arrays = true;
+
+  context_.reset(
+      new gpu::gles2::GLES2Implementation(gles2_cmd_helper_.get(),
+                                          NULL,
+                                          transfer_buffer_.get(),
+                                          bind_generates_resources,
+                                          lose_context_when_out_of_memory,
+                                          support_client_side_arrays,
+                                          this));
+
+  if (!context_->Initialize(
+      kTransferBufferSize,
+      kTransferBufferSize / 2,
+      kTransferBufferSize * 2,
+      gpu::gles2::GLES2Implementation::kNoLimit)) {
+    return EGL_NO_CONTEXT;
+  }
+
+  context_->EnableFeatureCHROMIUM("pepper3d_allow_buffers_on_multiple_targets");
+  context_->EnableFeatureCHROMIUM("pepper3d_support_fixed_attribs");
+
+  return context_.get();
+}
+
+void Display::DestroyContext(EGLContext ctx) {
+  DCHECK(IsValidContext(ctx));
+  context_.reset();
+  transfer_buffer_.reset();
+}
+
+bool Display::MakeCurrent(EGLSurface draw, EGLSurface read, EGLContext ctx) {
+  if (ctx == EGL_NO_CONTEXT) {
+    gles2::SetGLContext(NULL);
+  } else {
+    DCHECK(IsValidSurface(draw));
+    DCHECK(IsValidSurface(read));
+    DCHECK(IsValidContext(ctx));
+    gles2::SetGLContext(context_.get());
+    gl_context_->MakeCurrent(gl_surface_.get());
+  }
+  return true;
+}
+
+gpu::Capabilities Display::GetCapabilities() {
+  return decoder_->GetCapabilities();
+}
+
+int32_t Display::CreateImage(ClientBuffer buffer,
+                             size_t width,
+                             size_t height,
+                             unsigned internalformat) {
+  NOTIMPLEMENTED();
+  return -1;
+}
+
+void Display::DestroyImage(int32_t id) {
+  NOTIMPLEMENTED();
+}
+
+int32_t Display::CreateGpuMemoryBufferImage(size_t width,
+                                            size_t height,
+                                            unsigned internalformat,
+                                            unsigned usage) {
+  NOTIMPLEMENTED();
+  return -1;
+}
+
+void Display::SignalQuery(uint32_t query, const base::Closure& callback) {
+  NOTIMPLEMENTED();
+}
+
+void Display::SetLock(base::Lock*) {
+  NOTIMPLEMENTED();
+}
+
+bool Display::IsGpuChannelLost() {
+  NOTIMPLEMENTED();
+  return false;
+}
+
+void Display::EnsureWorkVisible() {
+  // This is only relevant for out-of-process command buffers.
+}
+
+gpu::CommandBufferNamespace Display::GetNamespaceID() const {
+  return gpu::CommandBufferNamespace::IN_PROCESS;
+}
+
+gpu::CommandBufferId Display::GetCommandBufferID() const {
+  return gpu::CommandBufferId();
+}
+
+int32_t Display::GetExtraCommandBufferData() const {
+  return 0;
 }
 
 uint64_t Display::GenerateFenceSyncRelease() {
-  base::AutoLock auto_lock(lock_);
   return next_fence_sync_release_++;
 }
 
 bool Display::IsFenceSyncRelease(uint64_t release) {
-  base::AutoLock auto_lock(lock_);
   return release > 0 && release < next_fence_sync_release_;
 }
 
 bool Display::IsFenceSyncFlushed(uint64_t release) {
   return IsFenceSyncRelease(release);
 }
 
 bool Display::IsFenceSyncFlushReceived(uint64_t release) {
   return IsFenceSyncRelease(release);
 }
 
-void Display::InitializeConfigsIfNeeded() {
-  lock_.AssertAcquired();
-  if (!configs_[0]) {
-    // The interface offers separate configs for window and pbuffer.
-    // This way we can record the client intention at context creation time.
-    // The GL implementation (gfx::GLContext and gfx::GLSurface) needs this
-    // distinction when creating a context.
-    configs_[0].reset(new Config(EGL_WINDOW_BIT));
-    configs_[1].reset(new Config(EGL_PBUFFER_BIT));
-  }
+void Display::SignalSyncToken(const gpu::SyncToken& sync_token,
+                              const base::Closure& callback) {
+  NOTIMPLEMENTED();
 }
 
-const Config* Display::GetConfig(EGLConfig cfg) {
-  lock_.AssertAcquired();
-  for (const auto& config : configs_) {
-    if (config.get() == cfg)
-      return config.get();
-  }
-  return nullptr;
-}
-
-Surface* Display::GetSurface(EGLSurface surface) {
-  lock_.AssertAcquired();
-  auto it = std::find(surfaces_.begin(), surfaces_.end(), surface);
-  if (it == surfaces_.end())
-    return nullptr;
-  return it->get();
-}
-
-Context* Display::GetContext(EGLContext context) {
-  lock_.AssertAcquired();
-  auto it = std::find(contexts_.begin(), contexts_.end(), context);
-  if (it == contexts_.end())
-    return nullptr;
-  return it->get();
+bool Display::CanWaitUnverifiedSyncToken(const gpu::SyncToken* sync_token) {
+  return false;
 }
 
 }  // namespace egl