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/*
* Copyright 2009, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// This file contains the definition of the IdAllocator class.
#ifndef O3D_COMMAND_BUFFER_CLIENT_CROSS_ID_ALLOCATOR_H_
#define O3D_COMMAND_BUFFER_CLIENT_CROSS_ID_ALLOCATOR_H_
#include <vector>
#include "base/basictypes.h"
#include "command_buffer/common/cross/types.h"
#include "command_buffer/common/cross/resource.h"
namespace o3d {
namespace command_buffer {
// 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.
command_buffer::ResourceId AllocateID() {
unsigned int bit = FindFirstFree();
SetBit(bit, true);
return bit;
}
// Frees a resource ID.
void FreeID(command_buffer::ResourceId id) {
SetBit(id, false);
}
// Checks whether or not a resource ID is in use.
bool InUse(command_buffer::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 command_buffer
} // namespace o3d
#endif // O3D_COMMAND_BUFFER_CLIENT_CROSS_ID_ALLOCATOR_H_
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