1 files changed, 262 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/libANGLE/RefCountObject.h b/gfx/angle/checkout/src/libANGLE/RefCountObject.h
new file mode 100644
index 0000000000..158b636755
--- /dev/null
+++ b/gfx/angle/checkout/src/libANGLE/RefCountObject.h
@@ -0,0 +1,262 @@
+//
+// 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 "libANGLE/Observer.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 = angle::Result>
+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);
+    }
+
+    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);
+        }
+    }
+
+    void assign(ObjectType *object) { mObject = object; }
+
+    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); }
+
+  protected:
+    ANGLE_INLINE void setImpl(ObjectType *obj) { mObject = obj; }
+
+  private:
+    ObjectType *mObject;
+};
+}  // namespace angle
+
+namespace gl
+{
+class Context;
+
+template <class ObjectType>
+class BindingPointer;
+
+using RefCountObjectNoID = angle::RefCountObject<Context, angle::Result>;
+
+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>
+{
+  public:
+    using ContextType = typename angle::BindingPointer<ObjectType, Context>::ContextType;
+    using ErrorType   = typename angle::BindingPointer<ObjectType, Context>::ErrorType;
+
+    BindingPointer() {}
+
+    BindingPointer(ObjectType *object) : angle::BindingPointer<ObjectType, Context>(object) {}
+
+    GLuint id() const
+    {
+        ObjectType *obj = this->get();
+        return obj ? obj->id() : 0;
+    }
+};
+
+template <class ObjectType>
+class OffsetBindingPointer : public BindingPointer<ObjectType>
+{
+  public:
+    using ContextType = typename BindingPointer<ObjectType>::ContextType;
+    using ErrorType   = typename BindingPointer<ObjectType>::ErrorType;
+
+    OffsetBindingPointer() : mOffset(0), mSize(0) {}
+
+    void set(const ContextType *context, ObjectType *newObject, GLintptr offset, GLsizeiptr size)
+    {
+        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);
+    }
+
+    void assign(ObjectType *object, GLintptr offset, GLsizeiptr size)
+    {
+        assign(object);
+        mOffset = offset;
+        mSize   = size;
+    }
+
+  private:
+    // Delete the unparameterized functions. This forces an explicit offset and size.
+    using BindingPointer<ObjectType>::set;
+    using BindingPointer<ObjectType>::assign;
+
+    GLintptr mOffset;
+    GLsizeiptr mSize;
+};
+
+template <typename SubjectT>
+class SubjectBindingPointer : protected BindingPointer<SubjectT>, public angle::ObserverBindingBase
+{
+  public:
+    SubjectBindingPointer(angle::ObserverInterface *observer, angle::SubjectIndex index)
+        : ObserverBindingBase(observer, index)
+    {}
+    ~SubjectBindingPointer() {}
+    SubjectBindingPointer(const SubjectBindingPointer &other) = default;
+    SubjectBindingPointer &operator=(const SubjectBindingPointer &other) = default;
+
+    void bind(const Context *context, SubjectT *subject)
+    {
+        // AddRef first in case subject == get()
+        if (subject)
+        {
+            subject->addObserver(this);
+            subject->addRef();
+        }
+
+        if (get())
+        {
+            get()->removeObserver(this);
+            get()->release(context);
+        }
+
+        this->setImpl(subject);
+    }
+
+    using BindingPointer<SubjectT>::get;
+    using BindingPointer<SubjectT>::operator->;
+
+    friend class State;
+};
+}  // 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_