Added ggl::IsCommandBufferContextLost that checks the state of the command buffer.

This will be used in the implementation of Extensions3DChromium::getGraphicsResetStatusARB.  Webkit change will follow once this lands.

BUG=58785
TEST=requires webkit change

Review URL: http://codereview.chromium.org/5188008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@67021 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 21 insertions, 0 deletions

diff --git a/chrome/renderer/ggl/ggl.cc b/chrome/renderer/ggl/ggl.cc
index f5d8ab1..b983514 100644
--- a/chrome/renderer/ggl/ggl.cc
+++ b/chrome/renderer/ggl/ggl.cc
@@ -111,6 +111,8 @@ class Context : public base::SupportsWeakPtr<Context> {
   // Replace the current error code with this.
   void SetError(Error error);
 
+  bool IsCommandBufferContextLost();
+
   // TODO(gman): Remove this.
   void DisableShaderTranslation();
 
@@ -405,6 +407,11 @@ void Context::SetError(Error error) {
   last_error_ = error;
 }
 
+bool Context::IsCommandBufferContextLost() {
+  gpu::CommandBuffer::State state = command_buffer_->GetLastState();
+  return state.error == gpu::error::kLostContext;
+}
+
 // TODO(gman): Remove This
 void Context::DisableShaderTranslation() {
   gles2_implementation_->CommandBufferEnableCHROMIUM(
@@ -542,6 +549,10 @@ Error GetError(Context* context) {
 #endif
 }
 
+bool IsCommandBufferContextLost(Context* context) {
+  return context->IsCommandBufferContextLost();
+}
+
 // TODO(gman): Remove This
 void DisableShaderTranslation(Context* context) {
 #if defined(ENABLE_GPU)
diff --git a/chrome/renderer/ggl/ggl.h b/chrome/renderer/ggl/ggl.h
index 54a7f8e..dcedcc0 100644
--- a/chrome/renderer/ggl/ggl.h
+++ b/chrome/renderer/ggl/ggl.h
@@ -162,6 +162,10 @@ gpu::gles2::GLES2Implementation* GetImplementation(Context* context);
 // Return the current GGL error.
 Error GetError(Context* context);
 
+// Return true if GPU process reported context lost or there was a problem
+// communicating with the GPU process.
+bool IsCommandBufferContextLost(Context* context);
+
 }  // namespace ggl
 
 #endif  // CHROME_RENDERER_GGL_GGL_H_
diff --git a/chrome/renderer/webgraphicscontext3d_command_buffer_impl.cc b/chrome/renderer/webgraphicscontext3d_command_buffer_impl.cc
index f6f731d..af89470 100644
--- a/chrome/renderer/webgraphicscontext3d_command_buffer_impl.cc
+++ b/chrome/renderer/webgraphicscontext3d_command_buffer_impl.cc
@@ -669,6 +669,10 @@ unsigned long WebGraphicsContext3DCommandBufferImpl::getError() {
   return glGetError();
 }
 
+bool WebGraphicsContext3DCommandBufferImpl::isContextLost() {
+  return ggl::IsCommandBufferContextLost(context_);
+}
+
 DELEGATE_TO_GL_2(getFloatv, GetFloatv, unsigned long, float*)
 
 DELEGATE_TO_GL_4(getFramebufferAttachmentParameteriv,
diff --git a/chrome/renderer/webgraphicscontext3d_command_buffer_impl.h b/chrome/renderer/webgraphicscontext3d_command_buffer_impl.h
index 481ee2d..bf9ecfe 100644
--- a/chrome/renderer/webgraphicscontext3d_command_buffer_impl.h
+++ b/chrome/renderer/webgraphicscontext3d_command_buffer_impl.h
@@ -165,6 +165,8 @@ class WebGraphicsContext3DCommandBufferImpl
 
   virtual unsigned long getError();
 
+  virtual bool isContextLost();
+
   virtual void getFloatv(unsigned long pname, float* value);
 
   virtual void getFramebufferAttachmentParameteriv(unsigned long target,