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// Copyright 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 <vector>
#include "cc/base/cc_export.h"
#include "cc/base/resource_id.h"
#include "gpu/command_buffer/common/sync_token.h"
namespace cc {
// A ReturnedResource is a struct passed along to a child compositor from a
// parent compositor that corresponds to a TransferableResource that was
// first passed to the parent compositor.
struct CC_EXPORT ReturnedResource {
ReturnedResource() : id(0), count(0), lost(false) {}
// |id| is an identifier generated by the child compositor that uniquely
// identifies a resource. This is the same ID space as TransferableResource.
ResourceId id;
// A |sync_token| is an identifier for a point in the parent compositor's
// command buffer. The child compositor then issues a WaitSyncPointCHROMIUM
// command with this |sync_token| as a parameter into its own command buffer.
// This ensures that uses of the resource submitted by the parent compositor
// are executed before commands submitted by the child.
gpu::SyncToken sync_token;
// |count| is a reference count for this resource. A resource may be used
// by mulitple compositor frames submitted to the parent compositor. |count|
// is the number of references being returned back to the child compositor.
int count;
// If the resource is lost, then the returner cannot give a sync point for it,
// and so it has taken ownership of the resource. The receiver cannot do
// anything with the resource except delete it.
bool lost;
typedef std::vector<ReturnedResource> ReturnedResourceArray;
} // namespace cc