Update from chromium https://crrev.com/301315

gpu/command_buffer/service/mailbox_manager_sync.cc

+// Copyright 2014 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/command_buffer/service/mailbox_manager_sync.h"
+
+#include <algorithm>
+#include <queue>
+
+#include "base/memory/linked_ptr.h"
+#include "base/synchronization/lock.h"
+#include "gpu/command_buffer/service/texture_manager.h"
+#include "ui/gl/gl_fence.h"
+#include "ui/gl/gl_implementation.h"
+
+#if !defined(OS_MACOSX)
+#include "ui/gl/gl_fence_egl.h"
+#endif
+
+namespace gpu {
+namespace gles2 {
+
+namespace {
+
+bool SkipTextureWorkarounds(const Texture* texture) {
+  // TODO(sievers): crbug.com/352274
+  // Should probably only fail if it already *has* mipmaps, while allowing
+  // incomplete textures here.
+  bool needs_mips =
+      texture->min_filter() != GL_NEAREST && texture->min_filter() != GL_LINEAR;
+  if (texture->target() != GL_TEXTURE_2D || needs_mips || !texture->IsDefined())
+    return true;
+
+  // Skip compositor resources/tile textures.
+  // TODO: Remove this, see crbug.com/399226.
+  if (texture->pool() == GL_TEXTURE_POOL_MANAGED_CHROMIUM)
+    return true;
+
+  return false;
+}
+
+base::LazyInstance<base::Lock> g_lock = LAZY_INSTANCE_INITIALIZER;
+
+typedef std::map<uint32, linked_ptr<gfx::GLFence>> SyncPointToFenceMap;
+base::LazyInstance<SyncPointToFenceMap> g_sync_point_to_fence =
+    LAZY_INSTANCE_INITIALIZER;
+#if !defined(OS_MACOSX)
+base::LazyInstance<std::queue<SyncPointToFenceMap::iterator>> g_sync_points =
+    LAZY_INSTANCE_INITIALIZER;
+#endif
+
+void CreateFenceLocked(uint32 sync_point) {
+  g_lock.Get().AssertAcquired();
+  if (gfx::GetGLImplementation() == gfx::kGLImplementationMockGL)
+    return;
+
+#if !defined(OS_MACOSX)
+  std::queue<SyncPointToFenceMap::iterator>& sync_points = g_sync_points.Get();
+  SyncPointToFenceMap& sync_point_to_fence = g_sync_point_to_fence.Get();
+  if (sync_point) {
+    while (!sync_points.empty() &&
+           sync_points.front()->second->HasCompleted()) {
+      sync_point_to_fence.erase(sync_points.front());
+      sync_points.pop();
+    }
+    // Need to use EGL fences since we are likely not in a single share group.
+    linked_ptr<gfx::GLFence> fence(make_linked_ptr(new gfx::GLFenceEGL(true)));
+    if (fence.get()) {
+      std::pair<SyncPointToFenceMap::iterator, bool> result =
+          sync_point_to_fence.insert(std::make_pair(sync_point, fence));
+      DCHECK(result.second);
+      sync_points.push(result.first);
+    }
+    DCHECK(sync_points.size() == sync_point_to_fence.size());
+  }
+#endif
+}
+
+void AcquireFenceLocked(uint32 sync_point) {
+  g_lock.Get().AssertAcquired();
+  SyncPointToFenceMap::iterator fence_it =
+      g_sync_point_to_fence.Get().find(sync_point);
+  if (fence_it != g_sync_point_to_fence.Get().end()) {
+    fence_it->second->ServerWait();
+  }
+}
+
+static const unsigned kNewTextureVersion = 1;
+
+}  // anonymous namespace
+
+base::LazyInstance<MailboxManagerSync::TextureGroup::MailboxToGroupMap>
+    MailboxManagerSync::TextureGroup::mailbox_to_group_ =
+        LAZY_INSTANCE_INITIALIZER;
+
+// static
+MailboxManagerSync::TextureGroup*
+MailboxManagerSync::TextureGroup::CreateFromTexture(const Mailbox& name,
+                                                    MailboxManagerSync* manager,
+                                                    Texture* texture) {
+  TextureGroup* group = new TextureGroup();
+  group->AddTexture(manager, texture);
+  group->AddName(name);
+  if (!SkipTextureWorkarounds(texture)) {
+    group->definition_ =
+        TextureDefinition(texture, kNewTextureVersion, NULL);
+  }
+  return group;
+}
+
+// static
+MailboxManagerSync::TextureGroup* MailboxManagerSync::TextureGroup::FromName(
+    const Mailbox& name) {
+  MailboxToGroupMap::iterator it = mailbox_to_group_.Get().find(name);
+  if (it == mailbox_to_group_.Get().end())
+    return NULL;
+
+  return it->second.get();
+}
+
+MailboxManagerSync::TextureGroup::TextureGroup() {
+}
+
+MailboxManagerSync::TextureGroup::~TextureGroup() {
+}
+
+void MailboxManagerSync::TextureGroup::AddName(const Mailbox& name) {
+  g_lock.Get().AssertAcquired();
+  DCHECK(std::find(names_.begin(), names_.end(), name) == names_.end());
+  names_.push_back(name);
+  DCHECK(mailbox_to_group_.Get().find(name) == mailbox_to_group_.Get().end());
+  mailbox_to_group_.Get()[name] = this;
+}
+
+void MailboxManagerSync::TextureGroup::RemoveName(const Mailbox& name) {
+  g_lock.Get().AssertAcquired();
+  std::vector<Mailbox>::iterator names_it =
+      std::find(names_.begin(), names_.end(), name);
+  DCHECK(names_it != names_.end());
+  names_.erase(names_it);
+  MailboxToGroupMap::iterator it = mailbox_to_group_.Get().find(name);
+  DCHECK(it != mailbox_to_group_.Get().end());
+  mailbox_to_group_.Get().erase(it);
+}
+
+void MailboxManagerSync::TextureGroup::AddTexture(MailboxManagerSync* manager,
+                                                  Texture* texture) {
+  g_lock.Get().AssertAcquired();
+  DCHECK(std::find(textures_.begin(), textures_.end(),
+                   std::make_pair(manager, texture)) == textures_.end());
+  textures_.push_back(std::make_pair(manager, texture));
+}
+
+bool MailboxManagerSync::TextureGroup::RemoveTexture(
+    MailboxManagerSync* manager,
+    Texture* texture) {
+  g_lock.Get().AssertAcquired();
+  TextureGroup::TextureList::iterator tex_list_it = std::find(
+      textures_.begin(), textures_.end(), std::make_pair(manager, texture));
+  DCHECK(tex_list_it != textures_.end());
+  if (textures_.size() == 1) {
+    // This is the last texture so the group is going away.
+    for (size_t n = 0; n < names_.size(); n++) {
+      const Mailbox& name = names_[n];
+      MailboxToGroupMap::iterator mbox_it =
+          mailbox_to_group_.Get().find(name);
+      DCHECK(mbox_it != mailbox_to_group_.Get().end());
+      DCHECK(mbox_it->second.get() == this);
+      mailbox_to_group_.Get().erase(mbox_it);
+    }
+    return false;
+  } else {
+    textures_.erase(tex_list_it);
+    return true;
+  }
+}
+
+Texture* MailboxManagerSync::TextureGroup::FindTexture(
+    MailboxManagerSync* manager) {
+  g_lock.Get().AssertAcquired();
+  for (TextureGroup::TextureList::iterator it = textures_.begin();
+       it != textures_.end(); it++) {
+    if (it->first == manager)
+      return it->second;
+  }
+  return NULL;
+}
+
+MailboxManagerSync::TextureGroupRef::TextureGroupRef(unsigned version,
+                                                     TextureGroup* group)
+    : version(version), group(group) {
+}
+
+MailboxManagerSync::TextureGroupRef::~TextureGroupRef() {
+}
+
+MailboxManagerSync::MailboxManagerSync() {
+}
+
+MailboxManagerSync::~MailboxManagerSync() {
+  DCHECK_EQ(0U, texture_to_group_.size());
+}
+
+bool MailboxManagerSync::UsesSync() {
+  return true;
+}
+
+Texture* MailboxManagerSync::ConsumeTexture(const Mailbox& mailbox) {
+  base::AutoLock lock(g_lock.Get());
+  TextureGroup* group = TextureGroup::FromName(mailbox);
+  if (!group)
+    return NULL;
+
+  // Check if a texture already exists in this share group.
+  Texture* texture = group->FindTexture(this);
+  if (texture)
+    return texture;
+
+  // Otherwise create a new texture.
+  texture = group->GetDefinition().CreateTexture();
+  if (texture) {
+    DCHECK(!SkipTextureWorkarounds(texture));
+    texture->SetMailboxManager(this);
+    group->AddTexture(this, texture);
+
+    TextureGroupRef new_ref =
+        TextureGroupRef(group->GetDefinition().version(), group);
+    texture_to_group_.insert(std::make_pair(texture, new_ref));
+  }
+
+  return texture;
+}
+
+void MailboxManagerSync::ProduceTexture(const Mailbox& mailbox,
+                                        Texture* texture) {
+  base::AutoLock lock(g_lock.Get());
+
+  TextureToGroupMap::iterator tex_it = texture_to_group_.find(texture);
+  TextureGroup* group_for_mailbox = TextureGroup::FromName(mailbox);
+  TextureGroup* group_for_texture = NULL;
+
+  if (tex_it != texture_to_group_.end()) {
+    group_for_texture = tex_it->second.group.get();
+    DCHECK(group_for_texture);
+    if (group_for_mailbox == group_for_texture) {
+      // The texture is already known under this name.
+      return;
+    }
+  }
+
+  if (group_for_mailbox) {
+    // Unlink the mailbox from its current group.
+    group_for_mailbox->RemoveName(mailbox);
+  }
+
+  if (group_for_texture) {
+    group_for_texture->AddName(mailbox);
+  } else {
+    // This is a new texture, so create a new group.
+    texture->SetMailboxManager(this);
+    group_for_texture =
+        TextureGroup::CreateFromTexture(mailbox, this, texture);
+    texture_to_group_.insert(std::make_pair(
+        texture, TextureGroupRef(kNewTextureVersion, group_for_texture)));
+  }
+
+  DCHECK(texture->mailbox_manager_ == this);
+}
+
+void MailboxManagerSync::TextureDeleted(Texture* texture) {
+  base::AutoLock lock(g_lock.Get());
+  TextureToGroupMap::iterator tex_it = texture_to_group_.find(texture);
+  DCHECK(tex_it != texture_to_group_.end());
+  TextureGroup* group_for_texture = tex_it->second.group.get();
+  if (group_for_texture->RemoveTexture(this, texture))
+    UpdateDefinitionLocked(texture, &tex_it->second);
+  texture_to_group_.erase(tex_it);
+}
+
+void MailboxManagerSync::UpdateDefinitionLocked(
+    Texture* texture,
+    TextureGroupRef* group_ref) {
+  g_lock.Get().AssertAcquired();
+
+  if (SkipTextureWorkarounds(texture))
+    return;
+
+  gfx::GLImage* gl_image = texture->GetLevelImage(texture->target(), 0);
+  TextureGroup* group = group_ref->group.get();
+  const TextureDefinition& definition = group->GetDefinition();
+  scoped_refptr<NativeImageBuffer> image_buffer = definition.image();
+
+  // Make sure we don't clobber with an older version
+  if (!definition.IsOlderThan(group_ref->version))
+    return;
+
+  // Also don't push redundant updates. Note that it would break the
+  // versioning.
+  if (definition.Matches(texture))
+    return;
+
+  if (gl_image && !image_buffer->IsClient(gl_image)) {
+    LOG(ERROR) << "MailboxSync: Incompatible attachment";
+    return;
+  }
+
+  group->SetDefinition(TextureDefinition(texture, ++group_ref->version,
+                                         gl_image ? image_buffer : NULL));
+}
+
+void MailboxManagerSync::PushTextureUpdates(uint32 sync_point) {
+  base::AutoLock lock(g_lock.Get());
+
+  for (TextureToGroupMap::iterator it = texture_to_group_.begin();
+       it != texture_to_group_.end(); it++) {
+    UpdateDefinitionLocked(it->first, &it->second);
+  }
+  CreateFenceLocked(sync_point);
+}
+
+void MailboxManagerSync::PullTextureUpdates(uint32 sync_point) {
+  base::AutoLock lock(g_lock.Get());
+  AcquireFenceLocked(sync_point);
+
+  for (TextureToGroupMap::iterator it = texture_to_group_.begin();
+       it != texture_to_group_.end(); it++) {
+    const TextureDefinition& definition = it->second.group->GetDefinition();
+    Texture* texture = it->first;
+    unsigned& texture_version = it->second.version;
+    if (texture_version == definition.version() ||
+        definition.IsOlderThan(texture_version))
+      continue;
+    texture_version = definition.version();
+    definition.UpdateTexture(texture);
+  }
+}
+
+}  // namespace gles2
+}  // namespace gpu