| /**************************************************************************** |
| ** |
| ** Copyright (C) 2015 Klaralvdalens Datakonsult AB (KDAB). |
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| ** This file is part of the Qt3D module of the Qt Toolkit. |
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| |
| #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); |
| } |
| |