dom/canvas/WebGLTransformFeedback.h
author Gurzau Raul <rgurzau@mozilla.com>
Wed, 24 Oct 2018 22:46:34 +0300
changeset 491134 13b39a6aa15fa631096b96d4351c2b1d08a4626e
parent 491129 4b5b1ff23dd7247ed098ac805c60292743f8eb20
child 491138 00540e73e97c2684b19c518fe098c0d8361f334f
permissions -rw-r--r--
Backed out changeset 4b5b1ff23dd7 (bug 1372157) for failing at webgl-conf/generated/test_2_conformance2__vertex_arrays__vertex-array-object.html on a CLOSED TREE

/* -*- 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_