/****************************************************************************
**
** Copyright (C) 2015 Klaralvdalens Datakonsult AB (KDAB).
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * 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.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "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 THE COPYRIGHT
** OWNER 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."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "instancebuffer.h"

#include <QtGui/qvector3d.h>

static const int rowCount = 20;
static const int colCount = 20;
static const int maxInstanceCount = rowCount * colCount;

InstanceBuffer::InstanceBuffer(Qt3DCore::QNode *parent)
    : Qt3DRender::QBuffer(parent)
    , m_instanceCount(maxInstanceCount)
{
    // Create some per instance data - position of each instance
    QByteArray ba;
    ba.resize(maxInstanceCount * sizeof(QVector3D));
    QVector3D *posData = reinterpret_cast<QVector3D *>(ba.data());
    for (int j = 0; j < rowCount; ++j) {
        const float z = float(j);
        for (int i = 0; i < colCount; ++i) {
            const float x = float(i);
            const QVector3D pos(x, 0.0f, z);
            *posData = pos;
            ++posData;
        }
    }

    // Put the data into the buffer
    setData(ba);
}

int InstanceBuffer::instanceCount() const
{
    return m_instanceCount;
}

void InstanceBuffer::setInstanceCount(int instanceCount)
{
    if (m_instanceCount == instanceCount)
        return;

    m_instanceCount = instanceCount;
    emit instanceCountChanged(instanceCount);
}

