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// Copyright (c) 2012 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.
// This file contains the definition of the IdAllocator class.
#ifndef GPU_COMMAND_BUFFER_CLIENT_ID_ALLOCATOR_H_
#define GPU_COMMAND_BUFFER_CLIENT_ID_ALLOCATOR_H_
#include <set>
#include <utility>
#include "base/compiler_specific.h"
#include "gpu/command_buffer/common/types.h"
#include "gpu/gpu_export.h"
namespace gpu {
// A resource ID, key to the resource maps.
typedef uint32 ResourceId;
// Invalid resource ID.
static const ResourceId kInvalidResource = 0u;
class GPU_EXPORT IdAllocatorInterface {
public:
virtual ~IdAllocatorInterface();
// Allocates a new resource ID.
virtual ResourceId AllocateID() = 0;
// Allocates an Id starting at or above desired_id.
// Note: may wrap if it starts near limit.
virtual ResourceId AllocateIDAtOrAbove(ResourceId desired_id) = 0;
// Marks an id as used. Returns false if id was already used.
virtual bool MarkAsUsed(ResourceId id) = 0;
// Frees a resource ID.
virtual void FreeID(ResourceId id) = 0;
// Checks whether or not a resource ID is in use.
virtual bool InUse(ResourceId id) const = 0;
};
// A class to manage the allocation of resource IDs.
class GPU_EXPORT IdAllocator : public IdAllocatorInterface {
public:
IdAllocator();
virtual ~IdAllocator();
// Implement IdAllocatorInterface.
virtual ResourceId AllocateID() OVERRIDE;
virtual ResourceId AllocateIDAtOrAbove(ResourceId desired_id) OVERRIDE;
virtual bool MarkAsUsed(ResourceId id) OVERRIDE;
virtual void FreeID(ResourceId id) OVERRIDE;
virtual bool InUse(ResourceId id) const OVERRIDE;
private:
// TODO(gman): This would work much better with ranges or a hash table.
typedef std::set<ResourceId> ResourceIdSet;
// The highest ID on the used list.
ResourceId LastUsedId() const;
// Lowest ID that isn't on the used list. This is slow, use as a last resort.
ResourceId FindFirstUnusedId() const;
ResourceIdSet used_ids_;
ResourceIdSet free_ids_;
DISALLOW_COPY_AND_ASSIGN(IdAllocator);
};
// A class to manage the allocation of resource IDs that are never reused. This
// implementation does not track which IDs are currently used. It is useful for
// shared and programs which cannot be implicitly created by binding a
// previously unused ID.
class NonReusedIdAllocator : public IdAllocatorInterface {
public:
NonReusedIdAllocator();
virtual ~NonReusedIdAllocator();
// Implement IdAllocatorInterface.
virtual ResourceId AllocateID() OVERRIDE;
virtual ResourceId AllocateIDAtOrAbove(ResourceId desired_id) OVERRIDE;
virtual bool MarkAsUsed(ResourceId id) OVERRIDE;
virtual void FreeID(ResourceId id) OVERRIDE;
virtual bool InUse(ResourceId id) const OVERRIDE;
private:
ResourceId last_id_;
DISALLOW_COPY_AND_ASSIGN(NonReusedIdAllocator);
};
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_CLIENT_ID_ALLOCATOR_H_
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