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68 lines
1.8 KiB
C++
68 lines
1.8 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// This file contains the definition of the IdAllocator class.
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#ifndef GPU_COMMAND_BUFFER_CLIENT_ID_ALLOCATOR_H_
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#define GPU_COMMAND_BUFFER_CLIENT_ID_ALLOCATOR_H_
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#include <stdint.h>
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#include <map>
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#include <utility>
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#include "base/compiler_specific.h"
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#include "base/macros.h"
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#include "gpu/gpu_export.h"
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namespace gpu {
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// A resource ID, key to the resource maps.
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typedef uint32_t ResourceId;
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// Invalid resource ID.
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static const ResourceId kInvalidResource = 0u;
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// A class to manage the allocation of resource IDs.
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class GPU_EXPORT IdAllocator {
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public:
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IdAllocator();
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~IdAllocator();
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// Allocates a new resource ID.
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ResourceId AllocateID();
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// Allocates an Id starting at or above desired_id.
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// Note: may wrap if it starts near limit.
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ResourceId AllocateIDAtOrAbove(ResourceId desired_id);
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// Allocates |range| amount of contiguous ids.
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// Returns the first id to |first_id| or |kInvalidResource| if
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// allocation failed.
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ResourceId AllocateIDRange(uint32_t range);
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// Marks an id as used. Returns false if id was already used.
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bool MarkAsUsed(ResourceId id);
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// Frees a resource ID.
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void FreeID(ResourceId id);
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// Frees a |range| amount of contiguous ids, starting from |first_id|.
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void FreeIDRange(ResourceId first_id, uint32_t range);
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// Checks whether or not a resource ID is in use.
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bool InUse(ResourceId id) const;
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private:
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// first_id -> last_id mapping.
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typedef std::map<ResourceId, ResourceId> ResourceIdRangeMap;
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ResourceIdRangeMap used_ids_;
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DISALLOW_COPY_AND_ASSIGN(IdAllocator);
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};
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} // namespace gpu
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#endif // GPU_COMMAND_BUFFER_CLIENT_ID_ALLOCATOR_H_
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