cc: Implement shared worker contexts. (v1)

content/common/gpu/client/context_provider_command_buffer.cc

 // Copyright (c) 2013 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 "content/common/gpu/client/context_provider_command_buffer.h"
 
 #include <set>
 #include <vector>
 
 #include "base/callback_helpers.h"
@@ skipping 34 matching lines @@
 
   return new ContextProviderCommandBuffer(context3d.Pass(), type);
 }
 
 ContextProviderCommandBuffer::ContextProviderCommandBuffer(
     scoped_ptr<WebGraphicsContext3DCommandBufferImpl> context3d,
     CommandBufferContextType type)
     : context3d_(context3d.Pass()),
       context_type_(type),
       debug_name_(CommandBufferContextTypeToString(type)),
+      lost_(false),
       destroyed_(false) {
   DCHECK(main_thread_checker_.CalledOnValidThread());
   DCHECK(context3d_);
   context_thread_checker_.DetachFromThread();
 }
 
 ContextProviderCommandBuffer::~ContextProviderCommandBuffer() {
-  DCHECK(main_thread_checker_.CalledOnValidThread() ||
-         context_thread_checker_.CalledOnValidThread());
-
   base::AutoLock lock(main_thread_lock_);
-
-  // Destroy references to the context3d_ before leaking it.
-  if (context3d_->GetCommandBufferProxy()) {
-    context3d_->GetCommandBufferProxy()->SetLock(nullptr);
-    context3d_->GetCommandBufferProxy()->SetMemoryAllocationChangedCallback(
-        CommandBufferProxyImpl::MemoryAllocationChangedCallback());
-  }
-  lost_context_callback_proxy_.reset();
+  DestroyWithLockAcquired();
 }
 
 
 CommandBufferProxyImpl* ContextProviderCommandBuffer::GetCommandBufferProxy() {
   return context3d_->GetCommandBufferProxy();
 }
 
+void ContextProviderCommandBuffer::Destroy() {
+  DCHECK(context_thread_checker_.CalledOnValidThread());
+  DCHECK(context3d_);
+  // Verify that SetupLock() has been called.
+  DCHECK(context3d_->GetCommandBufferProxy()->lock());
+  DestroyWithLockAcquired();
+}
+
 WebGraphicsContext3DCommandBufferImpl*
 ContextProviderCommandBuffer::WebContext3D() {
   DCHECK(context3d_);
   DCHECK(lost_context_callback_proxy_);  // Is bound to thread.
   DCHECK(context_thread_checker_.CalledOnValidThread());
 
   return context3d_.get();
 }
 
 bool ContextProviderCommandBuffer::BindToCurrentThread() {
@@ skipping 53 matching lines @@
 void ContextProviderCommandBuffer::InvalidateGrContext(uint32_t state) {
   if (gr_context_) {
     DCHECK(lost_context_callback_proxy_);  // Is bound to thread.
     DCHECK(context_thread_checker_.CalledOnValidThread());
     gr_context_->get()->resetContext(state);
   }
 }
 
 void ContextProviderCommandBuffer::SetupLock() {
   DCHECK(context3d_);
+  DCHECK(!context3d_->GetCommandBufferProxy()->lock());
   context3d_->GetCommandBufferProxy()->SetLock(&context_lock_);
 }
 
 base::Lock* ContextProviderCommandBuffer::GetLock() {
   return &context_lock_;
 }
 
 cc::ContextProvider::Capabilities
 ContextProviderCommandBuffer::ContextCapabilities() {
   DCHECK(lost_context_callback_proxy_);  // Is bound to thread.
@@ skipping 14 matching lines @@
   DCHECK(context_thread_checker_.CalledOnValidThread());
 
   if (gr_context_)
     gr_context_->FreeGpuResources();
 }
 
 void ContextProviderCommandBuffer::OnLostContext() {
   DCHECK(context_thread_checker_.CalledOnValidThread());
   {
     base::AutoLock lock(main_thread_lock_);
-    if (destroyed_)
+    if (lost_)
       return;
-    destroyed_ = true;
+    lost_ = true;
   }
   if (!lost_context_callback_.is_null())
     base::ResetAndReturn(&lost_context_callback_).Run();
   if (gr_context_)
     gr_context_->OnLostContext();
 }
 
 void ContextProviderCommandBuffer::OnMemoryAllocationChanged(
     const gpu::MemoryAllocation& allocation) {
   DCHECK(context_thread_checker_.CalledOnValidThread());
 
   if (memory_policy_changed_callback_.is_null())
     return;
 
   memory_policy_changed_callback_.Run(cc::ManagedMemoryPolicy(allocation));
 }
 
 void ContextProviderCommandBuffer::InitializeCapabilities() {
   Capabilities caps;
   caps.gpu = context3d_->GetImplementation()->capabilities();
 
   size_t mapped_memory_limit = context3d_->GetMappedMemoryLimit();
   caps.max_transfer_buffer_usage_bytes =
       mapped_memory_limit == WebGraphicsContext3DCommandBufferImpl::kNoLimit
       ? std::numeric_limits<size_t>::max() : mapped_memory_limit;
 
   capabilities_ = caps;
 }
 
-bool ContextProviderCommandBuffer::DestroyedOnMainThread() {
+bool ContextProviderCommandBuffer::HasBeenLostOnMainThread() {
   DCHECK(main_thread_checker_.CalledOnValidThread());
 
   base::AutoLock lock(main_thread_lock_);
-  return destroyed_;
+  return lost_;
 }
 
 void ContextProviderCommandBuffer::SetLostContextCallback(
     const LostContextCallback& lost_context_callback) {
   DCHECK(context_thread_checker_.CalledOnValidThread());
   DCHECK(lost_context_callback_.is_null() ||
          lost_context_callback.is_null());
   lost_context_callback_ = lost_context_callback;
 }
 
 void ContextProviderCommandBuffer::SetMemoryPolicyChangedCallback(
     const MemoryPolicyChangedCallback& memory_policy_changed_callback) {
   DCHECK(context_thread_checker_.CalledOnValidThread());
   DCHECK(memory_policy_changed_callback_.is_null() ||
          memory_policy_changed_callback.is_null());
   memory_policy_changed_callback_ = memory_policy_changed_callback;
 
   if (!memory_policy_changed_callback_.is_null()) {
     DCHECK(context3d_->GetCommandBufferProxy());
     context3d_->GetCommandBufferProxy()->SetMemoryAllocationChangedCallback(
         base::Bind(&ContextProviderCommandBuffer::OnMemoryAllocationChanged,
                    base::Unretained(this)));
   }
 }
 
+bool ContextProviderCommandBuffer::HasBeenDestroyed() {
+  DCHECK(context_thread_checker_.CalledOnValidThread());
+  return destroyed_;
+}
+
+void ContextProviderCommandBuffer::DestroyWithLockAcquired() {
+  if (context3d_ && context3d_->GetCommandBufferProxy()) {
+    context3d_->GetCommandBufferProxy()->SetLock(nullptr);
+    context3d_->GetCommandBufferProxy()->SetMemoryAllocationChangedCallback(
+        CommandBufferProxyImpl::MemoryAllocationChangedCallback());
+  }
+  lost_context_callback_proxy_.reset();
+  gr_context_.reset();
+  context3d_.reset();
+  destroyed_ = true;
+}
+
 }  // namespace content