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50
51#include "instancebuffer.h"
52
53#include <QtGui/qvector3d.h>
54
55static const int rowCount = 20;
56static const int colCount = 20;
57static const int maxInstanceCount = rowCount * colCount;
58
59InstanceBuffer::InstanceBuffer(Qt3DCore::QNode *parent)
60 : Qt3DRender::QBuffer(parent)
61 , m_instanceCount(maxInstanceCount)
62{
63 // Create some per instance data - position of each instance
64 QByteArray ba;
65 ba.resize(size: maxInstanceCount * sizeof(QVector3D));
66 QVector3D *posData = reinterpret_cast<QVector3D *>(ba.data());
67 for (int j = 0; j < rowCount; ++j) {
68 const float z = float(j);
69 for (int i = 0; i < colCount; ++i) {
70 const float x = float(i);
71 const QVector3D pos(x, 0.0f, z);
72 *posData = pos;
73 ++posData;
74 }
75 }
76
77 // Put the data into the buffer
78 setData(ba);
79}
80
81int InstanceBuffer::instanceCount() const
82{
83 return m_instanceCount;
84}
85
86void InstanceBuffer::setInstanceCount(int instanceCount)
87{
88 if (m_instanceCount == instanceCount)
89 return;
90
91 m_instanceCount = instanceCount;
92 emit instanceCountChanged(instanceCount);
93}
94
95

source code of qt3d/examples/qt3d/instanced-arrays-qml/instancebuffer.cpp