/*

 * Copyright (C) 2009 Apple Inc. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

 */

#include "config.h"

#if ENABLE(3D_CANVAS)

#include "WebGLProgram.h"

#include "WebGLRenderingContext.h"

namespace WebCore {

PassRefPtr<WebGLProgram> WebGLProgram::create(WebGLRenderingContext* ctx)

{

    return adoptRef(new WebGLProgram(ctx));

}

WebGLProgram::WebGLProgram(WebGLRenderingContext* ctx)

    : CanvasObject(ctx)

    , m_linkFailure(false)

{

    setObject(context()->graphicsContext3D()->createProgram());

}

void WebGLProgram::_deleteObject(Platform3DObject object)

{

    context()->graphicsContext3D()->deleteProgram(object);

}

bool WebGLProgram::cacheActiveAttribLocations()

{

    m_activeAttribLocations.clear();

    if (!object())

        return false;

    GraphicsContext3D* context3d = context()->graphicsContext3D();

    int linkStatus;

    context3d->getProgramiv(this, GraphicsContext3D::LINK_STATUS, &linkStatus);

    if (!linkStatus)

        return false;

    int numAttribs = 0;

    context3d->getProgramiv(this, GraphicsContext3D::ACTIVE_ATTRIBUTES, &numAttribs);

    m_activeAttribLocations.resize(static_cast<size_t>(numAttribs));

    for (int i = 0; i < numAttribs; ++i) {

        ActiveInfo info;

        context3d->getActiveAttrib(this, i, info);

        m_activeAttribLocations[i] = context3d->getAttribLocation(this, info.name.charactersWithNullTermination());

    }

    return true;

}

int WebGLProgram::numActiveAttribLocations() const

{

    return static_cast<int>(m_activeAttribLocations.size());

}

int WebGLProgram::getActiveAttribLocation(int index) const

{

    if (index < 0 || index >= numActiveAttribLocations())

        return -1;

    return m_activeAttribLocations[static_cast<size_t>(index)];

}

bool WebGLProgram::isUsingVertexAttrib0() const

{

    for (int ii = 0; ii < numActiveAttribLocations(); ++ii) {

        if (!getActiveAttribLocation(ii))

            return true;

    }

    return false;

}

}

#endif // ENABLE(3D_CANVAS)