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++ // Copyright (C) 2020 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++
++ #include "indextrianglestopology.h"
++
++ #include <QVector3D>
++
++ IndexTrianglesTopology::IndexTrianglesTopology()
++ {
++ updateData();
++ }
++
++ void IndexTrianglesTopology::updateData()
++ {
++ QByteArray vertexData;
++ QByteArray indexData;
++ setPrimitiveType(QQuick3DGeometry::PrimitiveType::Triangles);
++ addAttribute(QQuick3DGeometry::Attribute::PositionSemantic, 0,
++ QQuick3DGeometry::Attribute::ComponentType::F32Type);
++ addAttribute(QQuick3DGeometry::Attribute::NormalSemantic, 16,
++ QQuick3DGeometry::Attribute::ComponentType::F32Type);
++ addAttribute(QQuick3DGeometry::Attribute::IndexSemantic, 0,
++ QQuick3DGeometry::Attribute::ComponentType::U16Type);
++ setStride(32);
++
++ // Two Triangles with Vertex + Normals
++ const int vertexBufferSize = sizeof(float) * 4 * 2 * 4; // 2 x vec4 x 4
++ vertexData.resize(vertexBufferSize);
++
++ float *data = reinterpret_cast<float *>(vertexData.data());
++ // Vertex 0
++ data[0] = 0.0f;
++ data[1] = 1.0f;
++ data[2] = 0.0f;
++ data[3] = 1.0f;
++ // Normal 0
++ data[4] = 0.0f;
++ data[5] = 0.0f;
++ data[6] = 1.0f;
++ data[7] = 0.0f;
++
++ // Vertex 1
++ data[8] = -1.0f;
++ data[9] = 0.0f;
++ data[10] = 0.0f;
++ data[11] = 1.0f;
++ // Normal 1
++ data[12] = 0.0f;
++ data[13] = 0.0f;
++ data[14] = 1.0f;
++ data[15] = 0.0f;
++
++ // Vertex 2
++ data[16] = 1.0f;
++ data[17] = 0.0f;
++ data[18] = 0.0f;
++ data[19] = 1.0f;
++ // Normal 2
++ data[20] = 0.0f;
++ data[21] = 0.0f;
++ data[22] = 1.0f;
++ data[23] = 0.0f;
++
++ // Vertex 3
++ data[24] = 0.0f;
++ data[25] = -1.0f;
++ data[26] = 0.0f;
++ data[27] = 1.0f;
++ // Normal 3
++ data[28] = 0.0f;
++ data[29] = 0.0f;
++ data[30] = 1.0f;
++ data[31] = 0.0f;
++
++ setVertexData(vertexData);
++ indexData.resize(6 * sizeof(quint16));
++
++ quint16 *iData = reinterpret_cast<quint16 *>(indexData.data());
++ iData[0] = quint16(0);
++ iData[1] = quint16(1);
++ iData[2] = quint16(2);
++ iData[3] = quint16(2);
++ iData[4] = quint16(1);
++ iData[5] = quint16(3);
++ setIndexData(indexData);
++ setBounds(QVector3D(-1.0f, -1.0f, 0.0f), QVector3D(1.0f, 1.0f, 0.0f));
++ }