1 files changed, 139 insertions, 0 deletions
diff --git a/gfx/angle/src/libANGLE/RefCountObject.h b/gfx/angle/src/libANGLE/RefCountObject.h
new file mode 100755
index 000000000..86e6d788b
--- /dev/null
+++ b/gfx/angle/src/libANGLE/RefCountObject.h
@@ -0,0 +1,139 @@
+//
+// 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 "common/debug.h"
+
+#include "angle_gl.h"
+
+#include <cstddef>
+
+class RefCountObject : angle::NonCopyable
+{
+  public:
+    explicit RefCountObject(GLuint id) : mId(id), mRefCount(0) {}
+
+    void addRef() const { ++mRefCount; }
+
+    void release() const
+    {
+        ASSERT(mRefCount > 0);
+
+        if (--mRefCount == 0)
+        {
+            delete this;
+        }
+    }
+
+    GLuint id() const { return mId; }
+
+    size_t getRefCount() const { return mRefCount; }
+
+  protected:
+    virtual ~RefCountObject() { ASSERT(mRefCount == 0); }
+
+  private:
+    GLuint mId;
+
+    mutable std::size_t mRefCount;
+};
+
+template <class ObjectType>
+class BindingPointer
+{
+  public:
+    BindingPointer()
+        : mObject(nullptr)
+    {
+    }
+
+    BindingPointer(const BindingPointer<ObjectType> &other)
+        : mObject(nullptr)
+    {
+        set(other.mObject);
+    }
+
+    void operator=(const BindingPointer<ObjectType> &other)
+    {
+        set(other.mObject);
+    }
+
+    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(ObjectType *newObject)
+    {
+        // addRef first in case newObject == mObject and this is the last reference to it.
+        if (newObject != nullptr) reinterpret_cast<const RefCountObject*>(newObject)->addRef();
+        if (mObject != nullptr) reinterpret_cast<const RefCountObject*>(mObject)->release();
+        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(ObjectType *newObject) override
+    {
+        BindingPointer<ObjectType>::set(newObject);
+        mOffset = 0;
+        mSize = 0;
+    }
+
+    void set(ObjectType *newObject, GLintptr offset, GLsizeiptr size)
+    {
+        BindingPointer<ObjectType>::set(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;
+};
+
+#endif   // LIBANGLE_REFCOUNTOBJECT_H_