dynamicgeometry.cpp

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// Copyright (C) 2020 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#include "dynamicgeometry.h"

#include <QVector3D>

DynamicGeometry::DynamicGeometry()

    updateData();

void DynamicGeometry::changeGeometry()

    // Change vertex 1 and 2 positions

    QByteArray newData;

    newData.resize(sizeof(float) * 4 * 2 * 2);

    float *data = reinterpret_cast<float *>(newData.data());

    // Vertex 1

    data[0] = -2.0f;

    data[1] = 0.0f;

    data[2] = 0.0f;

    data[3] = 1.0f;

    // Normal 1

    data[4] = 0.0f;

    data[5] = 0.0f;

    data[6] = 1.0f;

    data[7] = 0.0f;

    // Vertex 2

    data[8] = 2.0f;

    data[9] = 0.0f;

    data[10] = 0.0f;

    data[11] = 1.0f;

    // Normal 2

    data[12] = 0.0f;

    data[13] = 0.0f;

    data[14] = 1.0f;

    data[15] = 0.0f;

    const int offset = sizeof(float) * 4 * 2; // skip vertex 0

    setVertexData(offset, newData);

    setBounds(QVector3D(-2.0f, -1.0f, 0.0f), QVector3D(2.0f, 1.0f, 0.0f));

void DynamicGeometry::changeBounds()

    setBounds(QVector3D(-1.0f, -1.0f, -2.0f), QVector3D(1.0f, 1.0f, -1.0f));

void DynamicGeometry::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));