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//
// Copyright (c) 2002-2016 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.
//
// HandleRangeAllocator.h: Defines the gl::HandleRangeAllocator class, which is used to
// allocate contiguous ranges of GL path handles.
#ifndef LIBANGLE_HANDLERANGEALLOCATOR_H_
#define LIBANGLE_HANDLERANGEALLOCATOR_H_
#include <map>
#include "angle_gl.h"
#include "common/angleutils.h"
namespace gl
{
// Allocates contiguous ranges of path object handles.
class HandleRangeAllocator final : angle::NonCopyable
{
public:
static const GLuint kInvalidHandle;
HandleRangeAllocator();
~HandleRangeAllocator();
// Allocates a new path handle.
GLuint allocate();
// Allocates a handle starting at or above the value of |wanted|.
// Note: may wrap if it starts near limit.
GLuint allocateAtOrAbove(GLuint wanted);
// Allocates |range| amount of contiguous paths.
// Returns the first id to |first_id| or |kInvalidHandle| if
// allocation failed.
GLuint allocateRange(GLuint range);
// Marks an id as used. Returns false if handle was already used.
bool markAsUsed(GLuint handle);
// Release handle.
void release(GLuint handle);
// Release a |range| amount of contiguous handles, starting from |first|
void releaseRange(GLuint first, GLuint range);
// Checks whether or not a resource ID is in use.
bool isUsed(GLuint handle) const;
private:
std::map<GLuint, GLuint> mUsed;
};
} // namespace gl
#endif // LIBANGLE_HANDLERANGEALLOCATOR_H_
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