gecko-dev/dom/canvas/WebGLVertexArrayFake.cpp

/* -*- 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