ppapi/proxy/ppb_graphics_3d_proxy.cc - chromium/src - Git at Google

 // Copyright 2012 The Chromium Authors
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "ppapi/proxy/ppb_graphics_3d_proxy.h"

 #include <memory>

 #include "base/numerics/safe_conversions.h"
 #include "build/build_config.h"
 #include "gpu/command_buffer/client/gles2_implementation.h"
 #include "gpu/command_buffer/common/command_buffer.h"
 #include "gpu/command_buffer/common/sync_token.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/proxy/enter_proxy.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
 #include "ppapi/proxy/ppapi_command_buffer_proxy.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/shared_impl/ppapi_globals.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/resource_creation_api.h"
 #include "ppapi/thunk/thunk.h"

 using ppapi::thunk::EnterResourceNoLock;
 using ppapi::thunk::PPB_Graphics3D_API;
 using ppapi::thunk::ResourceCreationAPI;

 namespace ppapi {
 namespace proxy {

 namespace {

 #if !BUILDFLAG(IS_NACL)
 base::UnsafeSharedMemoryRegion TransportSHMHandle(
     Dispatcher* dispatcher,
     const base::UnsafeSharedMemoryRegion& region) {
   return dispatcher->ShareUnsafeSharedMemoryRegionWithRemote(region);
 }
 #endif  // !BUILDFLAG(IS_NACL)

 gpu::CommandBuffer::State GetErrorState() {
   gpu::CommandBuffer::State error_state;
   error_state.error = gpu::error::kGenericError;
   return error_state;
 }

 }  // namespace

 Graphics3D::Graphics3D(const HostResource& resource, const gfx::Size& size)
     : PPB_Graphics3D_Shared(resource, size) {}

 Graphics3D::~Graphics3D() {
   DestroyGLES2Impl();
 }

 bool Graphics3D::Init(gpu::gles2::GLES2Implementation* share_gles2,
                       const gpu::Capabilities& capabilities,
                       SerializedHandle shared_state,
                       gpu::CommandBufferId command_buffer_id) {
   PluginDispatcher* dispatcher = PluginDispatcher::GetForResource(this);
   if (!dispatcher)
     return false;

   InstanceData* data = dispatcher->GetInstanceData(host_resource().instance());
   DCHECK(data);

   command_buffer_ = std::make_unique<PpapiCommandBufferProxy>(
       host_resource(), &data->flush_info, dispatcher, capabilities,
       std::move(shared_state), command_buffer_id);

   return CreateGLES2Impl(share_gles2);
 }

 PP_Bool Graphics3D::SetGetBuffer(int32_t /* transfer_buffer_id */) {
   return PP_FALSE;
 }

 PP_Bool Graphics3D::Flush(int32_t put_offset) {
   return PP_FALSE;
 }

 scoped_refptr<gpu::Buffer> Graphics3D::CreateTransferBuffer(
     uint32_t size,
     int32_t* id) {
   *id = -1;
   return nullptr;
 }

 PP_Bool Graphics3D::DestroyTransferBuffer(int32_t id) {
   return PP_FALSE;
 }

 gpu::CommandBuffer::State Graphics3D::WaitForTokenInRange(int32_t start,
                                                           int32_t end) {
   return GetErrorState();
 }

 gpu::CommandBuffer::State Graphics3D::WaitForGetOffsetInRange(
     uint32_t set_get_buffer_count,
     int32_t start,
     int32_t end) {
   return GetErrorState();
 }

 void Graphics3D::EnsureWorkVisible() {
   NOTREACHED();
 }

 void Graphics3D::ResolveAndDetachFramebuffer() {
   NOTREACHED();
 }

 gpu::CommandBuffer* Graphics3D::GetCommandBuffer() {
   return command_buffer_.get();
 }

 gpu::GpuControl* Graphics3D::GetGpuControl() {
   return command_buffer_.get();
 }

 int32_t Graphics3D::DoSwapBuffers(const gpu::SyncToken& sync_token,
                                   const gfx::Size& size) {
   // A valid sync token would indicate a swap buffer already happened somehow.
   DCHECK(!sync_token.HasData());

   gpu::gles2::GLES2Implementation* gl = gles2_impl();

   // Flush current GL commands.
   gl->ShallowFlushCHROMIUM();

   // Make sure we resolved and detached our frame buffer
   PluginDispatcher::GetForResource(this)->Send(
       new PpapiHostMsg_PPBGraphics3D_ResolveAndDetachFramebuffer(
           API_ID_PPB_GRAPHICS_3D, host_resource()));

   gpu::SyncToken new_sync_token;
   gl->GenSyncTokenCHROMIUM(new_sync_token.GetData());

   IPC::Message* msg = new PpapiHostMsg_PPBGraphics3D_SwapBuffers(
       API_ID_PPB_GRAPHICS_3D, host_resource(), new_sync_token, size);
   msg->set_unblock(true);
   PluginDispatcher::GetForResource(this)->Send(msg);

   return PP_OK_COMPLETIONPENDING;
 }

 void Graphics3D::DoResize(gfx::Size size) {
   // Flush current GL commands.
   gles2_impl()->ShallowFlushCHROMIUM();
   PluginDispatcher::GetForResource(this)->Send(
       new PpapiHostMsg_PPBGraphics3D_Resize(API_ID_PPB_GRAPHICS_3D,
                                             host_resource(), size));
 }

 PPB_Graphics3D_Proxy::PPB_Graphics3D_Proxy(Dispatcher* dispatcher)
     : InterfaceProxy(dispatcher),
       callback_factory_(this) {
 }

 PPB_Graphics3D_Proxy::~PPB_Graphics3D_Proxy() {
 }

 // static
 PP_Resource PPB_Graphics3D_Proxy::CreateProxyResource(
     PP_Instance instance,
     PP_Resource share_context,
     const int32_t* attrib_list) {
   PluginDispatcher* dispatcher = PluginDispatcher::GetForInstance(instance);
   if (!dispatcher)
     return PP_ERROR_BADARGUMENT;

   HostResource share_host;
   gpu::gles2::GLES2Implementation* share_gles2 = nullptr;
   if (share_context != 0) {
     EnterResourceNoLock<PPB_Graphics3D_API> enter(share_context, true);
     if (enter.failed())
       return PP_ERROR_BADARGUMENT;

     PPB_Graphics3D_Shared* share_graphics =
         static_cast<PPB_Graphics3D_Shared*>(enter.object());
     share_host = share_graphics->host_resource();
     share_gles2 = share_graphics->gles2_impl();
   }

   Graphics3DContextAttribs attrib_helper;
   if (attrib_list) {
     for (const int32_t* attr = attrib_list; attr[0] != PP_GRAPHICS3DATTRIB_NONE;
          attr += 2) {
       int32_t key = attr[0];
       int32_t value = attr[1];
       switch (key) {
         case PP_GRAPHICS3DATTRIB_ALPHA_SIZE:
           attrib_helper.alpha_size = value;
           break;
         case PP_GRAPHICS3DATTRIB_DEPTH_SIZE:
           attrib_helper.depth_size = value;
           break;
         case PP_GRAPHICS3DATTRIB_STENCIL_SIZE:
           attrib_helper.stencil_size = value;
           break;
         case PP_GRAPHICS3DATTRIB_SAMPLES:
           attrib_helper.samples = value;
           break;
         case PP_GRAPHICS3DATTRIB_SAMPLE_BUFFERS:
           attrib_helper.sample_buffers = value;
           break;
         case PP_GRAPHICS3DATTRIB_SWAP_BEHAVIOR:
           attrib_helper.buffer_preserved =
               value == PP_GRAPHICS3DATTRIB_BUFFER_PRESERVED;
           break;
         case PP_GRAPHICS3DATTRIB_WIDTH:
           attrib_helper.offscreen_framebuffer_size.set_width(value);
           break;
         case PP_GRAPHICS3DATTRIB_HEIGHT:
           attrib_helper.offscreen_framebuffer_size.set_height(value);
           break;
         case PP_GRAPHICS3DATTRIB_SINGLE_BUFFER:
           attrib_helper.single_buffer = !!value;
           break;
         // These attributes are valid, but ignored.
         case PP_GRAPHICS3DATTRIB_RED_SIZE:
         case PP_GRAPHICS3DATTRIB_BLUE_SIZE:
         case PP_GRAPHICS3DATTRIB_GREEN_SIZE:
         case PP_GRAPHICS3DATTRIB_GPU_PREFERENCE:
           break;
         default:
           DLOG(ERROR) << "Invalid context creation attribute: " << attr[0];
           return 0;
       }
     }
   }

   HostResource result;
   gpu::Capabilities capabilities;
   ppapi::proxy::SerializedHandle shared_state;
   gpu::CommandBufferId command_buffer_id;
   dispatcher->Send(new PpapiHostMsg_PPBGraphics3D_Create(
       API_ID_PPB_GRAPHICS_3D, instance, share_host, attrib_helper, &result,
       &capabilities, &shared_state, &command_buffer_id));

   if (result.is_null())
     return 0;

   scoped_refptr<Graphics3D> graphics_3d(
       new Graphics3D(result, attrib_helper.offscreen_framebuffer_size));
   if (!graphics_3d->Init(share_gles2, capabilities, std::move(shared_state),
                          command_buffer_id)) {
     return 0;
   }
   return graphics_3d->GetReference();
 }

 bool PPB_Graphics3D_Proxy::OnMessageReceived(const IPC::Message& msg) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(PPB_Graphics3D_Proxy, msg)
 #if !BUILDFLAG(IS_NACL)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_Create,
                         OnMsgCreate)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_SetGetBuffer,
                         OnMsgSetGetBuffer)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_WaitForTokenInRange,
                         OnMsgWaitForTokenInRange)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_WaitForGetOffsetInRange,
                         OnMsgWaitForGetOffsetInRange)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_AsyncFlush, OnMsgAsyncFlush)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_CreateTransferBuffer,
                         OnMsgCreateTransferBuffer)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_DestroyTransferBuffer,
                         OnMsgDestroyTransferBuffer)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_SwapBuffers,
                         OnMsgSwapBuffers)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_ResolveAndDetachFramebuffer,
                         OnMsgResolveAndDetachFramebuffer)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_Resize, OnMsgResize)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_EnsureWorkVisible,
                         OnMsgEnsureWorkVisible)
 #endif  // !BUILDFLAG(IS_NACL)

     IPC_MESSAGE_HANDLER(PpapiMsg_PPBGraphics3D_SwapBuffersACK,
                         OnMsgSwapBuffersACK)
     IPC_MESSAGE_UNHANDLED(handled = false)

   IPC_END_MESSAGE_MAP()
   // FIXME(brettw) handle bad messages!
   return handled;
 }

 #if !BUILDFLAG(IS_NACL)
 void PPB_Graphics3D_Proxy::OnMsgCreate(
     PP_Instance instance,
     HostResource share_context,
     const Graphics3DContextAttribs& context_attribs,
     HostResource* result,
     gpu::Capabilities* capabilities,
     SerializedHandle* shared_state,
     gpu::CommandBufferId* command_buffer_id) {
   shared_state->set_null_shmem_region();

   thunk::EnterResourceCreation enter(instance);

   if (!enter.succeeded())
     return;

   const base::UnsafeSharedMemoryRegion* region = nullptr;
   result->SetHostResource(
       instance, enter.functions()->CreateGraphics3DRaw(
                     instance, share_context.host_resource(), context_attribs,
                     capabilities, &region, command_buffer_id));
   if (!result->is_null()) {
     shared_state->set_shmem_region(
         base::UnsafeSharedMemoryRegion::TakeHandleForSerialization(
             TransportSHMHandle(dispatcher(), *region)));
   }
 }

 void PPB_Graphics3D_Proxy::OnMsgSetGetBuffer(const HostResource& context,
                                              int32_t transfer_buffer_id) {
   EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
   if (enter.succeeded())
     enter.object()->SetGetBuffer(transfer_buffer_id);
 }

 void PPB_Graphics3D_Proxy::OnMsgWaitForTokenInRange(
     const HostResource& context,
     int32_t start,
     int32_t end,
     gpu::CommandBuffer::State* state,
     bool* success) {
   EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
   if (enter.failed()) {
     *success = false;
     return;
   }
   *state = enter.object()->WaitForTokenInRange(start, end);
   *success = true;
 }

 void PPB_Graphics3D_Proxy::OnMsgWaitForGetOffsetInRange(
     const HostResource& context,
     uint32_t set_get_buffer_count,
     int32_t start,
     int32_t end,
     gpu::CommandBuffer::State* state,
     bool* success) {
   EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
   if (enter.failed()) {
     *success = false;
     return;
   }
   *state =
       enter.object()->WaitForGetOffsetInRange(set_get_buffer_count, start, end);
   *success = true;
 }

 void PPB_Graphics3D_Proxy::OnMsgAsyncFlush(const HostResource& context,
                                            int32_t put_offset) {
   EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
   if (enter.succeeded())
     enter.object()->Flush(put_offset);
 }

 void PPB_Graphics3D_Proxy::OnMsgCreateTransferBuffer(
     const HostResource& context,
     uint32_t size,
     int32_t* id,
     SerializedHandle* transfer_buffer) {
   transfer_buffer->set_null_shmem_region();
   EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
   if (enter.succeeded()) {
     scoped_refptr<gpu::Buffer> buffer =
         enter.object()->CreateTransferBuffer(size, id);
     if (!buffer.get())
       return;
     gpu::SharedMemoryBufferBacking* backing =
         static_cast<gpu::SharedMemoryBufferBacking*>(buffer->backing());
     DCHECK(backing && backing->shared_memory_region().IsValid());
     transfer_buffer->set_shmem_region(
         base::UnsafeSharedMemoryRegion::TakeHandleForSerialization(
             TransportSHMHandle(dispatcher(), backing->shared_memory_region())));
   } else {
     *id = -1;
   }
 }

 void PPB_Graphics3D_Proxy::OnMsgDestroyTransferBuffer(
     const HostResource& context,
     int32_t id) {
   EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
   if (enter.succeeded())
     enter.object()->DestroyTransferBuffer(id);
 }

 void PPB_Graphics3D_Proxy::OnMsgSwapBuffers(const HostResource& context,
                                             const gpu::SyncToken& sync_token,
                                             const gfx::Size& size) {
   EnterHostFromHostResourceForceCallback<PPB_Graphics3D_API> enter(
       context, callback_factory_,
       &PPB_Graphics3D_Proxy::SendSwapBuffersACKToPlugin, context);
   if (enter.succeeded())
     enter.SetResult(enter.object()->SwapBuffersWithSyncToken(
         enter.callback(), sync_token, size));
 }

 void PPB_Graphics3D_Proxy::OnMsgResolveAndDetachFramebuffer(
     const HostResource& context) {
   EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
   if (enter.succeeded())
     enter.object()->ResolveAndDetachFramebuffer();
 }

 void PPB_Graphics3D_Proxy::OnMsgResize(const HostResource& context,
                                        gfx::Size size) {
   EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
   if (enter.succeeded())
     enter.object()->ResizeBuffers(size.width(), size.height());
 }

 void PPB_Graphics3D_Proxy::OnMsgEnsureWorkVisible(const HostResource& context) {
   EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
   if (enter.succeeded())
     enter.object()->EnsureWorkVisible();
 }

 #endif  // !BUILDFLAG(IS_NACL)

 void PPB_Graphics3D_Proxy::OnMsgSwapBuffersACK(const HostResource& resource,
                                               int32_t pp_error) {
   EnterPluginFromHostResource<PPB_Graphics3D_API> enter(resource);
   if (enter.succeeded())
     static_cast<Graphics3D*>(enter.object())->SwapBuffersACK(pp_error);
 }

 #if !BUILDFLAG(IS_NACL)
 void PPB_Graphics3D_Proxy::SendSwapBuffersACKToPlugin(
     int32_t result,
     const HostResource& context) {
   dispatcher()->Send(new PpapiMsg_PPBGraphics3D_SwapBuffersACK(
       API_ID_PPB_GRAPHICS_3D, context, result));
 }
 #endif  // !BUILDFLAG(IS_NACL)

 }  // namespace proxy
 }  // namespace ppapi
	// Copyright 2012 The Chromium Authors
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "ppapi/proxy/ppb_graphics_3d_proxy.h"

	#include <memory>

	#include "base/numerics/safe_conversions.h"
	#include "build/build_config.h"
	#include "gpu/command_buffer/client/gles2_implementation.h"
	#include "gpu/command_buffer/common/command_buffer.h"
	#include "gpu/command_buffer/common/sync_token.h"
	#include "ppapi/c/pp_errors.h"
	#include "ppapi/proxy/enter_proxy.h"
	#include "ppapi/proxy/plugin_dispatcher.h"
	#include "ppapi/proxy/ppapi_command_buffer_proxy.h"
	#include "ppapi/proxy/ppapi_messages.h"
	#include "ppapi/shared_impl/ppapi_globals.h"
	#include "ppapi/thunk/enter.h"
	#include "ppapi/thunk/resource_creation_api.h"
	#include "ppapi/thunk/thunk.h"

	using ppapi::thunk::EnterResourceNoLock;
	using ppapi::thunk::PPB_Graphics3D_API;
	using ppapi::thunk::ResourceCreationAPI;

	namespace ppapi {
	namespace proxy {

	namespace {

	#if !BUILDFLAG(IS_NACL)
	base::UnsafeSharedMemoryRegion TransportSHMHandle(
	Dispatcher* dispatcher,
	const base::UnsafeSharedMemoryRegion& region) {
	return dispatcher->ShareUnsafeSharedMemoryRegionWithRemote(region);
	}
	#endif // !BUILDFLAG(IS_NACL)

	gpu::CommandBuffer::State GetErrorState() {
	gpu::CommandBuffer::State error_state;
	error_state.error = gpu::error::kGenericError;
	return error_state;
	}

	} // namespace

	Graphics3D::Graphics3D(const HostResource& resource, const gfx::Size& size)
	: PPB_Graphics3D_Shared(resource, size) {}

	Graphics3D::~Graphics3D() {
	DestroyGLES2Impl();
	}

	bool Graphics3D::Init(gpu::gles2::GLES2Implementation* share_gles2,
	const gpu::Capabilities& capabilities,
	SerializedHandle shared_state,
	gpu::CommandBufferId command_buffer_id) {
	PluginDispatcher* dispatcher = PluginDispatcher::GetForResource(this);
	if (!dispatcher)
	return false;

	InstanceData* data = dispatcher->GetInstanceData(host_resource().instance());
	DCHECK(data);

	command_buffer_ = std::make_unique<PpapiCommandBufferProxy>(
	host_resource(), &data->flush_info, dispatcher, capabilities,
	std::move(shared_state), command_buffer_id);

	return CreateGLES2Impl(share_gles2);
	}

	PP_Bool Graphics3D::SetGetBuffer(int32_t /* transfer_buffer_id */) {
	return PP_FALSE;
	}

	PP_Bool Graphics3D::Flush(int32_t put_offset) {
	return PP_FALSE;
	}

	scoped_refptr<gpu::Buffer> Graphics3D::CreateTransferBuffer(
	uint32_t size,
	int32_t* id) {
	*id = -1;
	return nullptr;
	}

	PP_Bool Graphics3D::DestroyTransferBuffer(int32_t id) {
	return PP_FALSE;
	}

	gpu::CommandBuffer::State Graphics3D::WaitForTokenInRange(int32_t start,
	int32_t end) {
	return GetErrorState();
	}

	gpu::CommandBuffer::State Graphics3D::WaitForGetOffsetInRange(
	uint32_t set_get_buffer_count,
	int32_t start,
	int32_t end) {
	return GetErrorState();
	}

	void Graphics3D::EnsureWorkVisible() {
	NOTREACHED();
	}

	void Graphics3D::ResolveAndDetachFramebuffer() {
	NOTREACHED();
	}

	gpu::CommandBuffer* Graphics3D::GetCommandBuffer() {
	return command_buffer_.get();
	}

	gpu::GpuControl* Graphics3D::GetGpuControl() {
	return command_buffer_.get();
	}

	int32_t Graphics3D::DoSwapBuffers(const gpu::SyncToken& sync_token,
	const gfx::Size& size) {
	// A valid sync token would indicate a swap buffer already happened somehow.
	DCHECK(!sync_token.HasData());

	gpu::gles2::GLES2Implementation* gl = gles2_impl();

	// Flush current GL commands.
	gl->ShallowFlushCHROMIUM();

	// Make sure we resolved and detached our frame buffer
	PluginDispatcher::GetForResource(this)->Send(
	new PpapiHostMsg_PPBGraphics3D_ResolveAndDetachFramebuffer(
	API_ID_PPB_GRAPHICS_3D, host_resource()));

	gpu::SyncToken new_sync_token;
	gl->GenSyncTokenCHROMIUM(new_sync_token.GetData());

	IPC::Message* msg = new PpapiHostMsg_PPBGraphics3D_SwapBuffers(
	API_ID_PPB_GRAPHICS_3D, host_resource(), new_sync_token, size);
	msg->set_unblock(true);
	PluginDispatcher::GetForResource(this)->Send(msg);

	return PP_OK_COMPLETIONPENDING;
	}

	void Graphics3D::DoResize(gfx::Size size) {
	// Flush current GL commands.
	gles2_impl()->ShallowFlushCHROMIUM();
	PluginDispatcher::GetForResource(this)->Send(
	new PpapiHostMsg_PPBGraphics3D_Resize(API_ID_PPB_GRAPHICS_3D,
	host_resource(), size));
	}

	PPB_Graphics3D_Proxy::PPB_Graphics3D_Proxy(Dispatcher* dispatcher)
	: InterfaceProxy(dispatcher),
	callback_factory_(this) {
	}

	PPB_Graphics3D_Proxy::~PPB_Graphics3D_Proxy() {
	}

	// static
	PP_Resource PPB_Graphics3D_Proxy::CreateProxyResource(
	PP_Instance instance,
	PP_Resource share_context,
	const int32_t* attrib_list) {
	PluginDispatcher* dispatcher = PluginDispatcher::GetForInstance(instance);
	if (!dispatcher)
	return PP_ERROR_BADARGUMENT;

	HostResource share_host;
	gpu::gles2::GLES2Implementation* share_gles2 = nullptr;
	if (share_context != 0) {
	EnterResourceNoLock<PPB_Graphics3D_API> enter(share_context, true);
	if (enter.failed())
	return PP_ERROR_BADARGUMENT;

	PPB_Graphics3D_Shared* share_graphics =
	static_cast<PPB_Graphics3D_Shared*>(enter.object());
	share_host = share_graphics->host_resource();
	share_gles2 = share_graphics->gles2_impl();
	}

	Graphics3DContextAttribs attrib_helper;
	if (attrib_list) {
	for (const int32_t* attr = attrib_list; attr[0] != PP_GRAPHICS3DATTRIB_NONE;
	attr += 2) {
	int32_t key = attr[0];
	int32_t value = attr[1];
	switch (key) {
	case PP_GRAPHICS3DATTRIB_ALPHA_SIZE:
	attrib_helper.alpha_size = value;
	break;
	case PP_GRAPHICS3DATTRIB_DEPTH_SIZE:
	attrib_helper.depth_size = value;
	break;
	case PP_GRAPHICS3DATTRIB_STENCIL_SIZE:
	attrib_helper.stencil_size = value;
	break;
	case PP_GRAPHICS3DATTRIB_SAMPLES:
	attrib_helper.samples = value;
	break;
	case PP_GRAPHICS3DATTRIB_SAMPLE_BUFFERS:
	attrib_helper.sample_buffers = value;
	break;
	case PP_GRAPHICS3DATTRIB_SWAP_BEHAVIOR:
	attrib_helper.buffer_preserved =
	value == PP_GRAPHICS3DATTRIB_BUFFER_PRESERVED;
	break;
	case PP_GRAPHICS3DATTRIB_WIDTH:
	attrib_helper.offscreen_framebuffer_size.set_width(value);
	break;
	case PP_GRAPHICS3DATTRIB_HEIGHT:
	attrib_helper.offscreen_framebuffer_size.set_height(value);
	break;
	case PP_GRAPHICS3DATTRIB_SINGLE_BUFFER:
	attrib_helper.single_buffer = !!value;
	break;
	// These attributes are valid, but ignored.
	case PP_GRAPHICS3DATTRIB_RED_SIZE:
	case PP_GRAPHICS3DATTRIB_BLUE_SIZE:
	case PP_GRAPHICS3DATTRIB_GREEN_SIZE:
	case PP_GRAPHICS3DATTRIB_GPU_PREFERENCE:
	break;
	default:
	DLOG(ERROR) << "Invalid context creation attribute: " << attr[0];
	return 0;
	}
	}
	}

	HostResource result;
	gpu::Capabilities capabilities;
	ppapi::proxy::SerializedHandle shared_state;
	gpu::CommandBufferId command_buffer_id;
	dispatcher->Send(new PpapiHostMsg_PPBGraphics3D_Create(
	API_ID_PPB_GRAPHICS_3D, instance, share_host, attrib_helper, &result,
	&capabilities, &shared_state, &command_buffer_id));

	if (result.is_null())
	return 0;

	scoped_refptr<Graphics3D> graphics_3d(
	new Graphics3D(result, attrib_helper.offscreen_framebuffer_size));
	if (!graphics_3d->Init(share_gles2, capabilities, std::move(shared_state),
	command_buffer_id)) {
	return 0;
	}
	return graphics_3d->GetReference();
	}

	bool PPB_Graphics3D_Proxy::OnMessageReceived(const IPC::Message& msg) {
	bool handled = true;
	IPC_BEGIN_MESSAGE_MAP(PPB_Graphics3D_Proxy, msg)
	#if !BUILDFLAG(IS_NACL)
	IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_Create,
	OnMsgCreate)
	IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_SetGetBuffer,
	OnMsgSetGetBuffer)
	IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_WaitForTokenInRange,
	OnMsgWaitForTokenInRange)
	IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_WaitForGetOffsetInRange,
	OnMsgWaitForGetOffsetInRange)
	IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_AsyncFlush, OnMsgAsyncFlush)
	IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_CreateTransferBuffer,
	OnMsgCreateTransferBuffer)
	IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_DestroyTransferBuffer,
	OnMsgDestroyTransferBuffer)
	IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_SwapBuffers,
	OnMsgSwapBuffers)
	IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_ResolveAndDetachFramebuffer,
	OnMsgResolveAndDetachFramebuffer)
	IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_Resize, OnMsgResize)
	IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_EnsureWorkVisible,
	OnMsgEnsureWorkVisible)
	#endif // !BUILDFLAG(IS_NACL)

	IPC_MESSAGE_HANDLER(PpapiMsg_PPBGraphics3D_SwapBuffersACK,
	OnMsgSwapBuffersACK)
	IPC_MESSAGE_UNHANDLED(handled = false)

	IPC_END_MESSAGE_MAP()
	// FIXME(brettw) handle bad messages!
	return handled;
	}

	#if !BUILDFLAG(IS_NACL)
	void PPB_Graphics3D_Proxy::OnMsgCreate(
	PP_Instance instance,
	HostResource share_context,
	const Graphics3DContextAttribs& context_attribs,
	HostResource* result,
	gpu::Capabilities* capabilities,
	SerializedHandle* shared_state,
	gpu::CommandBufferId* command_buffer_id) {
	shared_state->set_null_shmem_region();

	thunk::EnterResourceCreation enter(instance);

	if (!enter.succeeded())
	return;

	const base::UnsafeSharedMemoryRegion* region = nullptr;
	result->SetHostResource(
	instance, enter.functions()->CreateGraphics3DRaw(
	instance, share_context.host_resource(), context_attribs,
	capabilities, &region, command_buffer_id));
	if (!result->is_null()) {
	shared_state->set_shmem_region(
	base::UnsafeSharedMemoryRegion::TakeHandleForSerialization(
	TransportSHMHandle(dispatcher(), *region)));
	}
	}

	void PPB_Graphics3D_Proxy::OnMsgSetGetBuffer(const HostResource& context,
	int32_t transfer_buffer_id) {
	EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
	if (enter.succeeded())
	enter.object()->SetGetBuffer(transfer_buffer_id);
	}

	void PPB_Graphics3D_Proxy::OnMsgWaitForTokenInRange(
	const HostResource& context,
	int32_t start,
	int32_t end,
	gpu::CommandBuffer::State* state,
	bool* success) {
	EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
	if (enter.failed()) {
	*success = false;
	return;
	}
	*state = enter.object()->WaitForTokenInRange(start, end);
	*success = true;
	}

	void PPB_Graphics3D_Proxy::OnMsgWaitForGetOffsetInRange(
	const HostResource& context,
	uint32_t set_get_buffer_count,
	int32_t start,
	int32_t end,
	gpu::CommandBuffer::State* state,
	bool* success) {
	EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
	if (enter.failed()) {
	*success = false;
	return;
	}
	*state =
	enter.object()->WaitForGetOffsetInRange(set_get_buffer_count, start, end);
	*success = true;
	}

	void PPB_Graphics3D_Proxy::OnMsgAsyncFlush(const HostResource& context,
	int32_t put_offset) {
	EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
	if (enter.succeeded())
	enter.object()->Flush(put_offset);
	}

	void PPB_Graphics3D_Proxy::OnMsgCreateTransferBuffer(
	const HostResource& context,
	uint32_t size,
	int32_t* id,
	SerializedHandle* transfer_buffer) {
	transfer_buffer->set_null_shmem_region();
	EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
	if (enter.succeeded()) {
	scoped_refptr<gpu::Buffer> buffer =
	enter.object()->CreateTransferBuffer(size, id);
	if (!buffer.get())
	return;
	gpu::SharedMemoryBufferBacking* backing =
	static_cast<gpu::SharedMemoryBufferBacking*>(buffer->backing());
	DCHECK(backing && backing->shared_memory_region().IsValid());
	transfer_buffer->set_shmem_region(
	base::UnsafeSharedMemoryRegion::TakeHandleForSerialization(
	TransportSHMHandle(dispatcher(), backing->shared_memory_region())));
	} else {
	*id = -1;
	}
	}

	void PPB_Graphics3D_Proxy::OnMsgDestroyTransferBuffer(
	const HostResource& context,
	int32_t id) {
	EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
	if (enter.succeeded())
	enter.object()->DestroyTransferBuffer(id);
	}

	void PPB_Graphics3D_Proxy::OnMsgSwapBuffers(const HostResource& context,
	const gpu::SyncToken& sync_token,
	const gfx::Size& size) {
	EnterHostFromHostResourceForceCallback<PPB_Graphics3D_API> enter(
	context, callback_factory_,
	&PPB_Graphics3D_Proxy::SendSwapBuffersACKToPlugin, context);
	if (enter.succeeded())
	enter.SetResult(enter.object()->SwapBuffersWithSyncToken(
	enter.callback(), sync_token, size));
	}

	void PPB_Graphics3D_Proxy::OnMsgResolveAndDetachFramebuffer(
	const HostResource& context) {
	EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
	if (enter.succeeded())
	enter.object()->ResolveAndDetachFramebuffer();
	}

	void PPB_Graphics3D_Proxy::OnMsgResize(const HostResource& context,
	gfx::Size size) {
	EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
	if (enter.succeeded())
	enter.object()->ResizeBuffers(size.width(), size.height());
	}

	void PPB_Graphics3D_Proxy::OnMsgEnsureWorkVisible(const HostResource& context) {
	EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
	if (enter.succeeded())
	enter.object()->EnsureWorkVisible();
	}

	#endif // !BUILDFLAG(IS_NACL)

	void PPB_Graphics3D_Proxy::OnMsgSwapBuffersACK(const HostResource& resource,
	int32_t pp_error) {
	EnterPluginFromHostResource<PPB_Graphics3D_API> enter(resource);
	if (enter.succeeded())
	static_cast<Graphics3D*>(enter.object())->SwapBuffersACK(pp_error);
	}

	#if !BUILDFLAG(IS_NACL)
	void PPB_Graphics3D_Proxy::SendSwapBuffersACKToPlugin(
	int32_t result,
	const HostResource& context) {
	dispatcher()->Send(new PpapiMsg_PPBGraphics3D_SwapBuffersACK(
	API_ID_PPB_GRAPHICS_3D, context, result));
	}
	#endif // !BUILDFLAG(IS_NACL)

	} // namespace proxy
	} // namespace ppapi