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//
// Copyright (c) 2002-2011 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// HandleAllocator.h: Defines the gl::HandleAllocator class, which is used to
// allocate GL handles.
#ifndef LIBANGLE_HANDLEALLOCATOR_H_
#define LIBANGLE_HANDLEALLOCATOR_H_
#include "common/angleutils.h"
#include "angle_gl.h"
#include <stack>
namespace gl
{
class HandleAllocator final : angle::NonCopyable
{
public:
// Maximum handle = MAX_UINT-1
HandleAllocator();
// Specify maximum handle value
HandleAllocator(GLuint maximumHandleValue);
~HandleAllocator();
void setBaseHandle(GLuint value);
GLuint allocate();
void release(GLuint handle);
void reserve(GLuint handle);
private:
GLuint mBaseValue;
GLuint mNextValue;
typedef std::vector<GLuint> HandleList;
HandleList mFreeValues;
// Represents an inclusive range [begin, end]
struct HandleRange
{
HandleRange(GLuint beginIn, GLuint endIn) : begin(beginIn), end(endIn) {}
GLuint begin;
GLuint end;
};
struct HandleRangeComparator;
// The freelist consists of never-allocated handles, stored
// as ranges, and handles that were previously allocated and
// released, stored in a stack.
std::vector<HandleRange> mUnallocatedList;
std::vector<GLuint> mReleasedList;
};
} // namespace gl
#endif // LIBANGLE_HANDLEALLOCATOR_H_
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