/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef WEBGL_QUERY_H_

#define WEBGL_QUERY_H_

#include "mozilla/LinkedList.h"

#include "nsWrapperCache.h"

#include "WebGLObjectModel.h"

#include "nsThreadUtils.h"

namespace mozilla {

namespace webgl {

class AvailabilityRunnable;

} // namespace webgl

class WebGLQuery final

    : public nsWrapperCache

    , public WebGLRefCountedObject<WebGLQuery>

    , public LinkedListElement<WebGLQuery>

{

    friend class webgl::AvailabilityRunnable;

    friend class WebGLRefCountedObject<WebGLQuery>;

public:

    const GLuint mGLName;

private:

    GLenum mTarget;

    WebGLRefPtr<WebGLQuery>* mActiveSlot;

    bool mCanBeAvailable = false; // Track whether the event loop has spun

    ////

public:

    GLenum Target() const { return mTarget; }

    bool IsActive() const { return bool(mActiveSlot); }

    ////

    NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(WebGLQuery)

    NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(WebGLQuery)

    explicit WebGLQuery(WebGLContext* webgl);

private:

    ~WebGLQuery() {

        DeleteOnce();

    };

    // WebGLRefCountedObject

    void Delete();

public:

    WebGLContext* GetParentObject() const { return mContext; }

    virtual JSObject* WrapObject(JSContext* cx, JS::Handle<JSObject*> givenProto) override;

    ////

    void BeginQuery(GLenum target, WebGLRefPtr<WebGLQuery>& slot);

    void DeleteQuery();

    void EndQuery();

    void GetQueryParameter(GLenum pname, JS::MutableHandleValue retval) const;

    bool IsQuery() const;

    void QueryCounter(GLenum target);

};

} // namespace mozilla

#endif // WEBGL_QUERY_H_