/*
 * Copyright (C) 2009 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "modules/webgl/WebGLObject.h"

#include "modules/webgl/WebGLRenderingContextBase.h"

namespace blink {

WebGLObject::WebGLObject(WebGLRenderingContextBase* context)
    : m_cachedNumberOfContextLosses(context->numberOfContextLosses()),
      m_attachmentCount(0),
      m_deleted(false),
      m_destructionInProgress(false) {}

WebGLObject::~WebGLObject() {}

uint32_t WebGLObject::cachedNumberOfContextLosses() const {
  return m_cachedNumberOfContextLosses;
}

void WebGLObject::deleteObject(gpu::gles2::GLES2Interface* gl) {
  m_deleted = true;
  if (!hasObject())
    return;

  if (!hasGroupOrContext())
    return;

  if (currentNumberOfContextLosses() != m_cachedNumberOfContextLosses) {
    // This object has been invalidated.
    return;
  }

  if (!m_attachmentCount) {
    if (!gl)
      gl = getAGLInterface();
    if (gl) {
      deleteObjectImpl(gl);
      // Ensure the inherited class no longer claims to have a valid object
      ASSERT(!hasObject());
    }
  }
}

void WebGLObject::detach() {
  m_attachmentCount = 0;  // Make sure OpenGL resource is deleted.
}

void WebGLObject::detachAndDeleteObject() {
  // To ensure that all platform objects are deleted after being detached,
  // this method does them together.
  detach();
  deleteObject(nullptr);
}

void WebGLObject::runDestructor() {
  DCHECK(!m_destructionInProgress);
  // This boilerplate destructor is sufficient for all subclasses, as long
  // as they implement deleteObjectImpl properly, and don't try to touch
  // other objects on the Oilpan heap if the destructor's been entered.
  m_destructionInProgress = true;
  detachAndDeleteObject();
}

bool WebGLObject::destructionInProgress() const {
  return m_destructionInProgress;
}

void WebGLObject::onDetached(gpu::gles2::GLES2Interface* gl) {
  if (m_attachmentCount)
    --m_attachmentCount;
  if (m_deleted)
    deleteObject(gl);
}

DEFINE_TRACE_WRAPPERS(WebGLObject) {}

}  // namespace blink