gecko-dev/dom/canvas/WebGLTransformFeedback.h

/* -*- 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"
    // 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_