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// Copyright (C) 2015 Klaralvdalens Datakonsult AB (KDAB).
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#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)
: Qt3DCore::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);
}
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