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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_VIZ_SERVICE_DISPLAY_RESOURCE_FENCE_H_
#define COMPONENTS_VIZ_SERVICE_DISPLAY_RESOURCE_FENCE_H_
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "components/viz/common/resources/resource_id.h"
#include "components/viz/service/viz_service_export.h"
#include "ui/gfx/gpu_fence_handle.h"
namespace viz {
class DisplayResourceProvider;
// An abstract interface used to ensure reading from resources passed between
// client and service does not happen before writing is completed.
// Instances of this class are accessed from the display compositor thread.
class VIZ_SERVICE_EXPORT ResourceFence
: public base::RefCounted<ResourceFence> {
public:
ResourceFence(const ResourceFence&) = delete;
ResourceFence& operator=(const ResourceFence&) = delete;
// Tells if the fence is ready.
virtual bool HasPassed() = 0;
// A release fence which availability depends on the type of resource fence
// (managed by DisplayResourceProvider and
// TransferableResource::synchronization_type). The client must ensure that
// HasPassed is true before trying to access the release fence handle.
// Otherwise, it's not guaranteed that the fence handle is valid.
virtual gfx::GpuFenceHandle GetGpuFenceHandle() = 0;
// Notifies the fence is needed.
void set() { set_ = true; }
bool was_set() const { return set_; }
// Tracks a resource that will be released when this ResourceFence passes.
void TrackDeferredResource(ResourceId id);
protected:
friend class base::RefCounted<ResourceFence>;
explicit ResourceFence(DisplayResourceProvider* resource_provider);
virtual ~ResourceFence();
// Conveys to |resource_provider_| that this resource fence has passed.
void FencePassed();
private:
bool set_ = false;
base::flat_set<ResourceId> deferred_resources_;
base::WeakPtr<DisplayResourceProvider> resource_provider_;
};
} // namespace viz
#endif // COMPONENTS_VIZ_SERVICE_DISPLAY_RESOURCE_FENCE_H_
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