/* -*- 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 {

namespace webgl {

struct CachedDrawFetchLimits;

}

class WebGLTransformFeedback final

    : public nsWrapperCache

    , public WebGLRefCountedObject<WebGLTransformFeedback>

    , public LinkedListElement<WebGLTransformFeedback>

{

    friend class ScopedDrawWithTransformFeedback;

    friend class WebGLContext;

    friend class WebGL2Context;

    friend class WebGLProgram;

    friend const webgl::CachedDrawFetchLimits*

        ValidateDraw(WebGLContext*, GLenum, uint32_t);

public:

    const GLuint mGLName;

private:

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

    // It's not yet in the ES3 spec, but the generic TF buffer bind point has been moved

    // to context state, instead of TFO state.

    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_