kc3-lang/angle/src/libANGLE/RefCountObject.h

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• Hash : 1c7f08c3
  Author :
  Date : 2018-10-10T16:13:02
  

  Inline RefCountObject::release.
  
  Also don't return errors from the object release methods. Not returning
  errors reduces the amount of code generated. Also we shouldn't be
  exiting early from destructor type functions.
  
  Increases object binding performance.
  
  Bug: angleproject:2877
  Change-Id: Ieb8120d885b946915e355419825e1f52f31d7b49
  Reviewed-on: https://chromium-review.googlesource.com/c/1270218
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  

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• src/libANGLE/RefCountObject.h

• //
  // 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 angle
  {
  
  template <typename ContextT, typename ErrorT>
  class RefCountObject : angle::NonCopyable
  {
    public:
      using ContextType = ContextT;
      using ErrorType   = ErrorT;
  
      RefCountObject() : mRefCount(0) {}
  
      virtual void onDestroy(const ContextType *context) {}
  
      void addRef() const { ++mRefCount; }
  
      ANGLE_INLINE void release(const ContextType *context)
      {
          ASSERT(mRefCount > 0);
          if (--mRefCount == 0)
          {
              onDestroy(context);
              delete this;
          }
      }
  
      size_t getRefCount() const { return mRefCount; }
  
    protected:
      virtual ~RefCountObject() { ASSERT(mRefCount == 0); }
  
      mutable size_t mRefCount;
  };
  
  template <class ObjectType, typename ContextT, typename ErrorT>
  class BindingPointer
  {
    public:
      using ContextType = ContextT;
      using ErrorType   = ErrorT;
  
      BindingPointer()
          : mObject(nullptr)
      {
      }
  
      BindingPointer(ObjectType *object) : mObject(object)
      {
          if (mObject)
          {
              mObject->addRef();
          }
      }
  
      BindingPointer(const BindingPointer &other) : mObject(other.mObject)
      {
          if (mObject)
          {
              mObject->addRef();
          }
      }
  
      BindingPointer &operator=(BindingPointer &&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 ContextType *context, ObjectType *newObject)
      {
          // addRef first in case newObject == mObject and this is the last reference to it.
          if (newObject != nullptr)
          {
              reinterpret_cast<RefCountObject<ContextType, ErrorType> *>(newObject)->addRef();
          }
  
          // Store the old pointer in a temporary so we can set the pointer before calling release.
          // Otherwise the object could still be referenced when its destructor is called.
          ObjectType *oldObject = mObject;
          mObject = newObject;
          if (oldObject != nullptr)
          {
              reinterpret_cast<RefCountObject<ContextType, ErrorType> *>(oldObject)->release(context);
          }
      }
  
      ObjectType *get() const { return mObject; }
      ObjectType *operator->() const { return mObject; }
  
      bool operator==(const BindingPointer &other) const { return mObject == other.mObject; }
  
      bool operator!=(const BindingPointer &other) const { return !(*this == other); }
  
    private:
      ObjectType *mObject;
  };
  }  // namespace angle
  
  namespace gl
  {
  class Context;
  
  template <class ObjectType>
  class BindingPointer;
  
  using RefCountObjectNoID = angle::RefCountObject<Context, Error>;
  
  class RefCountObject : public gl::RefCountObjectNoID
  {
    public:
      explicit RefCountObject(GLuint id) : mId(id) {}
  
      GLuint id() const { return mId; }
  
    protected:
      ~RefCountObject() override {}
  
    private:
      GLuint mId;
  };
  
  template <class ObjectType>
  class BindingPointer : public angle::BindingPointer<ObjectType, Context, Error>
  {
    public:
      using ContextType = typename angle::BindingPointer<ObjectType, Context, Error>::ContextType;
      using ErrorType   = typename angle::BindingPointer<ObjectType, Context, Error>::ErrorType;
  
      BindingPointer() {}
  
      BindingPointer(ObjectType *object) : angle::BindingPointer<ObjectType, Context, Error>(object)
      {
      }
  
      GLuint id() const
      {
          ObjectType *obj = this->get();
          return obj ? obj->id() : 0;
      }
  };
  
  template <class ObjectType>
  class OffsetBindingPointer : public gl::BindingPointer<ObjectType>
  {
    public:
      using ContextType = typename gl::BindingPointer<ObjectType>::ContextType;
      using ErrorType   = typename gl::BindingPointer<ObjectType>::ErrorType;
  
      OffsetBindingPointer() : mOffset(0), mSize(0) { }
  
      void set(const ContextType *context, ObjectType *newObject) override
      {
          BindingPointer<ObjectType>::set(context, newObject);
          mOffset = 0;
          mSize = 0;
      }
  
      void set(const ContextType *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
  
  namespace egl
  {
  class Display;
  
  using RefCountObject = angle::RefCountObject<Display, Error>;
  
  template <class ObjectType>
  using BindingPointer = angle::BindingPointer<ObjectType, Display, Error>;
  
  }  // namespace egl
  
  #endif   // LIBANGLE_REFCOUNTOBJECT_H_
  

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