/* -*- 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/. */

#include "WebGLVertexArrayFake.h"

#include "GLContext.h"

#include "WebGLContext.h"

namespace mozilla {

WebGLVertexArrayFake::WebGLVertexArrayFake(WebGLContext* webgl)

    : WebGLVertexArray(webgl)

    , mIsVAO(false)

{ }

void

WebGLVertexArrayFake::BindVertexArrayImpl()

{

    // Go through and re-bind all buffers and setup all

    // vertex attribute pointers

    gl::GLContext* gl = mContext->gl;

    WebGLRefPtr<WebGLVertexArray> prevVertexArray = mContext->mBoundVertexArray;

    mContext->mBoundVertexArray = this;

    WebGLRefPtr<WebGLBuffer> prevBuffer = mContext->mBoundArrayBuffer;

    mContext->BindBuffer(LOCAL_GL_ELEMENT_ARRAY_BUFFER, mElementArrayBuffer);

    size_t i = 0;

    for (const auto& vd : mAttribs) {

        mContext->BindBuffer(LOCAL_GL_ARRAY_BUFFER, vd.mBuf);

        vd.DoVertexAttribPointer(gl, i);

        if (vd.mEnabled) {

            gl->fEnableVertexAttribArray(i);

        } else {

            gl->fDisableVertexAttribArray(i);

        }

        ++i;

    }

    size_t len = prevVertexArray->mAttribs.Length();

    for (; i < len; ++i) {

        const auto& vd = prevVertexArray->mAttribs[i];

        if (vd.mEnabled) {

            gl->fDisableVertexAttribArray(i);

        }

    }

    mContext->BindBuffer(LOCAL_GL_ARRAY_BUFFER, prevBuffer);

    mIsVAO = true;

}

void

WebGLVertexArrayFake::DeleteImpl()

{

    mIsVAO = false;

}

bool

WebGLVertexArrayFake::IsVertexArrayImpl() const

{

    return mIsVAO;

}

} // namespace mozilla