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// Copyright (c) 2009 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 <vector>
#include "../common/types.h"
namespace gpu {
// A resource ID, key to the resource maps.
typedef uint32 ResourceId;
// Invalid resource ID.
static const ResourceId kInvalidResource = 0xffffffffU;
// A class to manage the allocation of resource IDs. It uses a bitfield stored
// into a vector of unsigned ints.
class IdAllocator {
public:
IdAllocator();
// Allocates a new resource ID.
ResourceId AllocateID() {
unsigned int bit = FindFirstFree();
SetBit(bit, true);
return bit;
}
// Frees a resource ID.
void FreeID(ResourceId id) {
SetBit(id, false);
}
// Checks whether or not a resource ID is in use.
bool InUse(ResourceId id) {
return GetBit(id);
}
private:
void SetBit(unsigned int bit, bool value);
bool GetBit(unsigned int bit) const;
unsigned int FindFirstFree() const;
std::vector<Uint32> bitmap_;
DISALLOW_COPY_AND_ASSIGN(IdAllocator);
};
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_CLIENT_ID_ALLOCATOR_H_
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