Implement the Platform::sharedOffscreenGraphicsContext3D method.

webkit/gpu/context_provider_in_process.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 "webkit/gpu/context_provider_in_process.h"
+
+#include "webkit/gpu/grcontext_for_webgraphicscontext3d.h"
+#include "webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h"
+#include "webkit/gpu/webgraphicscontext3d_in_process_impl.h"
+
+namespace webkit {
+namespace gpu {
+
+class ContextProviderInProcess::LostContextCallbackProxy
+    : public WebKit::WebGraphicsContext3D::WebGraphicsContextLostCallback {
+ public:
+  LostContextCallbackProxy(ContextProviderInProcess* provider)
+      : provider_(provider) {
+    provider_->context3d_->setContextLostCallback(this);
+  }
+
+  virtual void onContextLost() {
+    provider_->OnLostContext();
+  }
+
+ private:
+  ContextProviderInProcess* provider_;
+};
+
+class ContextProviderInProcess::MemoryAllocationCallbackProxy
+    : public WebKit::WebGraphicsContext3D::
+          WebGraphicsMemoryAllocationChangedCallbackCHROMIUM {
+ public:
+  MemoryAllocationCallbackProxy(ContextProviderInProcess* provider)

[jamesr, 2013/02/26 19:18:11]

explicit

[danakj, 2013/02/26 19:23:02]

Done.

+      : provider_(provider) {
+    provider_->context3d_->setMemoryAllocationChangedCallbackCHROMIUM(this);
+  }
+
+  void onMemoryAllocationChanged(WebKit::WebGraphicsMemoryAllocation alloc) {
+    provider_->OnMemoryAllocationChanged(!!alloc.gpuResourceSizeInBytes);
+  }
+
+ private:
+  ContextProviderInProcess* provider_;
+};
+
+ContextProviderInProcess::ContextProviderInProcess(InProcessType type)
+    : type_(type),
+      destroyed_(false) {
+}
+
+ContextProviderInProcess::~ContextProviderInProcess() {}
+
+bool ContextProviderInProcess::InitializeOnMainThread() {
+  if (destroyed_)
+    return false;
+  if (context3d_)
+    return true;
+
+  context3d_ = CreateOffscreenContext3d().Pass();
+  destroyed_ = !context3d_;
+  return !!context3d_;
+}
+
+bool ContextProviderInProcess::BindToCurrentThread() {
+  if (lost_context_callback_proxy_)
+    return true;
+
+  bool result = context3d_->makeContextCurrent();
+  lost_context_callback_proxy_.reset(new LostContextCallbackProxy(this));
+  return result;
+}
+
+WebKit::WebGraphicsContext3D* ContextProviderInProcess::Context3d() {
+  return context3d_.get();
+}
+
+class GrContext* ContextProviderInProcess::GrContext() {
+  if (gr_context_)
+    return gr_context_->get();
+
+  gr_context_.reset(
+      new webkit::gpu::GrContextForWebGraphicsContext3D(context3d_.get()));
+  memory_allocation_callback_proxy_.reset(
+      new MemoryAllocationCallbackProxy(this));
+  return gr_context_->get();
+}
+
+void ContextProviderInProcess::VerifyContexts() {
+  if (!destroyed_ && context3d_->isContextLost())
+    OnLostContext();
+}
+
+void ContextProviderInProcess::OnLostContext() {
+  base::AutoLock lock(destroyed_lock_);
+  destroyed_ = true;
+}
+
+bool ContextProviderInProcess::DestroyedOnMainThread() {
+  base::AutoLock lock(destroyed_lock_);
+  return destroyed_;
+}
+
+void ContextProviderInProcess::OnMemoryAllocationChanged(
+    bool nonzero_allocation) {
+  if (gr_context_)
+    gr_context_->SetMemoryLimit(nonzero_allocation);
+}
+
+static scoped_ptr<WebKit::WebGraphicsContext3D> CreateInProcessImpl(
+    const WebKit::WebGraphicsContext3D::Attributes& attributes) {
+  return make_scoped_ptr(
+      webkit::gpu::WebGraphicsContext3DInProcessImpl::CreateForWebView(
+          attributes, false)).PassAs<WebKit::WebGraphicsContext3D>();
+}
+
+static scoped_ptr<WebKit::WebGraphicsContext3D> CreateCommandBufferImpl(
+    const WebKit::WebGraphicsContext3D::Attributes& attributes) {
+  scoped_ptr<webkit::gpu::WebGraphicsContext3DInProcessCommandBufferImpl> ctx(
+      new webkit::gpu::WebGraphicsContext3DInProcessCommandBufferImpl());
+  if (!ctx->Initialize(attributes, NULL))
+    return scoped_ptr<WebKit::WebGraphicsContext3D>();
+  return ctx.PassAs<WebKit::WebGraphicsContext3D>();
+}
+
+scoped_ptr<WebKit::WebGraphicsContext3D>
+ContextProviderInProcess::CreateOffscreenContext3d() {
+  WebKit::WebGraphicsContext3D::Attributes attributes;
+  attributes.depth = false;
+  attributes.stencil = true;
+  attributes.antialias = false;
+  attributes.shareResources = true;
+  attributes.noAutomaticFlushes = true;
+
+  switch (type_) {
+    case IN_PROCESS:
+      return CreateInProcessImpl(attributes).Pass();
+    case IN_PROCESS_COMMAND_BUFFER:
+      return CreateCommandBufferImpl(attributes).Pass();
+  }
+  NOTREACHED();
+}
+
+}  // namespace gpu
+}  // namespace webkit