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// Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "tessellatedquadmesh.h"
#include <Qt3DCore/qattribute.h>
#include <Qt3DCore/qbuffer.h>
#include <Qt3DCore/qgeometry.h>
class TessellatedGeometry : public Qt3DCore::QGeometry
{
Q_OBJECT
public:
TessellatedGeometry(Qt3DCore::QNode *parent = nullptr)
: Qt3DCore::QGeometry(parent)
, m_positionAttribute(new Qt3DCore::QAttribute(this))
, m_vertexBuffer(new Qt3DCore::QBuffer(this))
{
const float positionData[] = {
-0.8f, -0.8f, 0.0f,
0.8f, -0.8f, 0.0f,
0.8f, 0.8f, 0.0f,
-0.8f, 0.8f, 0.0f
};
const int nVerts = 4;
const int size = nVerts * 3 * sizeof(float);
QByteArray positionBytes;
positionBytes.resize(size);
memcpy(positionBytes.data(), positionData, size);
m_vertexBuffer->setData(positionBytes);
m_positionAttribute->setName(Qt3DCore::QAttribute::defaultPositionAttributeName());
m_positionAttribute->setVertexBaseType(Qt3DCore::QAttribute::Float);
m_positionAttribute->setVertexSize(3);
m_positionAttribute->setCount(nVerts);
m_positionAttribute->setByteStride(3 * sizeof(float));
m_positionAttribute->setBuffer(m_vertexBuffer);
addAttribute(m_positionAttribute);
}
private:
Qt3DCore::QAttribute *m_positionAttribute;
Qt3DCore::QBuffer *m_vertexBuffer;
};
TessellatedQuadMesh::TessellatedQuadMesh(Qt3DCore::QNode *parent)
: Qt3DRender::QGeometryRenderer(parent)
{
setPrimitiveType(Qt3DRender::QGeometryRenderer::Patches);
setVerticesPerPatch(4);
setGeometry(new TessellatedGeometry(this));
}
#include "tessellatedquadmesh.moc"
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