/* -*- 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_TRANSFORM_FEEDBACK_H_

#define WEBGL_TRANSFORM_FEEDBACK_H_

#include "mozilla/LinkedList.h"

#include "nsWrapperCache.h"

#include "WebGLObjectModel.h"

namespace mozilla {

class WebGLTransformFeedback final

    : public nsWrapperCache,

      public WebGLRefCountedObject<WebGLTransformFeedback>,

      public LinkedListElement<WebGLTransformFeedback> {

  friend class ScopedDrawHelper;

  friend class ScopedDrawWithTransformFeedback;

  friend class WebGLContext;

  friend class WebGL2Context;

  friend class WebGLProgram;

 public:

  const GLuint mGLName;

 private:

  // GLES 3.0.4 p267, Table 6.24 "Transform Feedback State"

  WebGLRefPtr<WebGLBuffer> mGenericBufferBinding;

  std::vector<IndexedBufferBinding> mIndexedBindings;

  bool mIsPaused;

  bool mIsActive;

  // Not in state tables:

  WebGLRefPtr<WebGLProgram> mActive_Program;

  MOZ_INIT_OUTSIDE_CTOR GLenum mActive_PrimMode;

  MOZ_INIT_OUTSIDE_CTOR size_t mActive_VertPosition;

  MOZ_INIT_OUTSIDE_CTOR size_t mActive_VertCapacity;

 public:

  WebGLTransformFeedback(WebGLContext* webgl, GLuint tf);

 private:

  ~WebGLTransformFeedback();

 public:

  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(WebGLTransformFeedback)

  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(WebGLTransformFeedback)

  void Delete();

  WebGLContext* GetParentObject() const { return mContext; }

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

  bool IsActiveAndNotPaused() const { return mIsActive && !mIsPaused; }

  void AddBufferBindCounts(int8_t addVal) const;

  // GL Funcs

  void BeginTransformFeedback(GLenum primMode);

  void EndTransformFeedback();

  void PauseTransformFeedback();

  void ResumeTransformFeedback();

};

}  // namespace mozilla

#endif  // WEBGL_TRANSFORM_FEEDBACK_H_