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//
// Copyright (c) 2002-2010 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.
//
// RefCountObject.h: Defines the gl::RefCountObject base class that provides
// lifecycle support for GL objects using the traditional BindObject scheme, but
// that need to be reference counted for correct cross-context deletion.
// (Concretely, textures, buffers and renderbuffers.)
#ifndef LIBANGLE_REFCOUNTOBJECT_H_
#define LIBANGLE_REFCOUNTOBJECT_H_
#include "angle_gl.h"
#include "common/debug.h"
#include "libANGLE/Error.h"
#include <cstddef>
namespace gl
{
class Context;
class RefCountObjectNoID : angle::NonCopyable
{
public:
RefCountObjectNoID() : mRefCount(0) {}
virtual Error onDestroy(const Context *context);
void addRef() const { ++mRefCount; }
void release() const
{
ASSERT(mRefCount > 0);
if (--mRefCount == 0)
{
delete this;
}
}
size_t getRefCount() const { return mRefCount; }
protected:
virtual ~RefCountObjectNoID();
// A specialized release method for objects which need a destroy context.
void release(const gl::Context *context)
{
ASSERT(mRefCount > 0);
if (--mRefCount == 0)
{
ANGLE_SWALLOW_ERR(onDestroy(context));
delete this;
}
}
template <class ObjectType>
friend class BindingPointer;
mutable std::size_t mRefCount;
};
inline RefCountObjectNoID::~RefCountObjectNoID()
{
ASSERT(mRefCount == 0);
}
inline Error RefCountObjectNoID::onDestroy(const Context *context)
{
return NoError();
}
template <class ObjectType>
class BindingPointer;
class RefCountObject : RefCountObjectNoID
{
public:
explicit RefCountObject(GLuint id) : mId(id) {}
GLuint id() const { return mId; }
using RefCountObjectNoID::release;
using RefCountObjectNoID::addRef;
using RefCountObjectNoID::getRefCount;
protected:
~RefCountObject() override {}
private:
GLuint mId;
};
template <class ObjectType>
class BindingPointer
{
public:
BindingPointer()
: mObject(nullptr)
{
}
BindingPointer(ObjectType *object) : mObject(object) { mObject->addRef(); }
BindingPointer(const BindingPointer<ObjectType> &other) : mObject(other.mObject)
{
mObject->addRef();
}
BindingPointer &operator=(BindingPointer<ObjectType> &&other)
{
std::swap(mObject, other.mObject);
return *this;
}
virtual ~BindingPointer()
{
// Objects have to be released before the resource manager is destroyed, so they must be explicitly cleaned up.
ASSERT(mObject == nullptr);
}
virtual void set(const Context *context, ObjectType *newObject)
{
// addRef first in case newObject == mObject and this is the last reference to it.
if (newObject != nullptr) reinterpret_cast<const RefCountObjectNoID*>(newObject)->addRef();
if (mObject != nullptr)
reinterpret_cast<RefCountObjectNoID *>(mObject)->release(context);
mObject = newObject;
}
ObjectType *get() const { return mObject; }
ObjectType *operator->() const { return mObject; }
GLuint id() const { return (mObject != nullptr) ? mObject->id() : 0; }
bool operator==(const BindingPointer<ObjectType> &other) const
{
return mObject == other.mObject;
}
bool operator!=(const BindingPointer<ObjectType> &other) const { return !(*this == other); }
private:
ObjectType *mObject;
};
template <class ObjectType>
class OffsetBindingPointer : public BindingPointer<ObjectType>
{
public:
OffsetBindingPointer() : mOffset(0), mSize(0) { }
void set(const Context *context, ObjectType *newObject) override
{
BindingPointer<ObjectType>::set(context, newObject);
mOffset = 0;
mSize = 0;
}
void set(const Context *context, ObjectType *newObject, GLintptr offset, GLsizeiptr size)
{
BindingPointer<ObjectType>::set(context, newObject);
mOffset = offset;
mSize = size;
}
GLintptr getOffset() const { return mOffset; }
GLsizeiptr getSize() const { return mSize; }
bool operator==(const OffsetBindingPointer<ObjectType> &other) const
{
return this->get() == other.get() && mOffset == other.mOffset && mSize == other.mSize;
}
bool operator!=(const OffsetBindingPointer<ObjectType> &other) const
{
return !(*this == other);
}
private:
GLintptr mOffset;
GLsizeiptr mSize;
};
} // namespace gl
#endif // LIBANGLE_REFCOUNTOBJECT_H_
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