mirror of https://github.com/qt/qt3d.git
355 lines
14 KiB
C++
355 lines
14 KiB
C++
// Copyright (C) 2016 Klaralvdalens Datakonsult AB (KDAB).
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
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#include <QGuiApplication>
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#include <Qt3DCore/QEntity>
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#include <Qt3DRender/QCamera>
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#include <Qt3DRender/QCameraLens>
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#include <Qt3DCore/QTransform>
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#include <Qt3DCore/QAspectEngine>
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#include <Qt3DCore/QGeometry>
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#include <Qt3DCore/QAttribute>
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#include <Qt3DCore/QBuffer>
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#include <Qt3DInput/QInputAspect>
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#include <Qt3DRender/QRenderStateSet>
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#include <Qt3DRender/QRenderAspect>
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#include <Qt3DExtras/QForwardRenderer>
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#include <Qt3DExtras/QPerVertexColorMaterial>
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#include <Qt3DRender/QGeometryRenderer>
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#include <QPropertyAnimation>
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#include <Qt3DExtras/qt3dwindow.h>
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#include <Qt3DExtras/qorbitcameracontroller.h>
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namespace {
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struct IndirectElementDrawBuffer{ // Element Indirect
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uint count;
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uint instancesCount;
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uint firstIndex;
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uint baseVertex;
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uint baseInstance;
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};
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struct IndirectArrayDrawBuffer{ // Array Indirect
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uint count;
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uint instancesCount;
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uint first;
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uint baseInstance;
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};
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} // anonymous
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int main(int argc, char* argv[])
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{
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QGuiApplication app(argc, argv);
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Qt3DExtras::Qt3DWindow view;
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view.defaultFrameGraph()->setClearColor(QColor::fromRgbF(0.0, 0.5, 1.0, 1.0));
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// Root entity
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Qt3DCore::QEntity *rootEntity = new Qt3DCore::QEntity();
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// Camera
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Qt3DRender::QCamera *cameraEntity = view.camera();
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cameraEntity->lens()->setPerspectiveProjection(45.0f, 16.0f/9.0f, 0.1f, 1000.0f);
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cameraEntity->setPosition(QVector3D(0, 0, 40.0f));
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cameraEntity->setUpVector(QVector3D(0, 1, 0));
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cameraEntity->setViewCenter(QVector3D(0, 0, 0));
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// For camera controls
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Qt3DExtras::QOrbitCameraController *camController = new Qt3DExtras::QOrbitCameraController(rootEntity);
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camController->setCamera(cameraEntity);
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// Material
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Qt3DRender::QMaterial *material = new Qt3DExtras::QPerVertexColorMaterial(rootEntity);
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// vec3 for position
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// vec3 for colors
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// vec3 for normals
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/* 2
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/|\
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/ | \
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/ /3\ \
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0/___\ 1
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*/
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// Vertices
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QVector3D v0(-1.0f, 0.0f, -1.0f);
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QVector3D v1(1.0f, 0.0f, -1.0f);
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QVector3D v2(0.0f, 1.0f, 0.0f);
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QVector3D v3(0.0f, 0.0f, 1.0f);
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// Faces Normals
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QVector3D n023 = QVector3D::normal(v0, v2, v3);
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QVector3D n012 = QVector3D::normal(v0, v1, v2);
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QVector3D n310 = QVector3D::normal(v3, v1, v0);
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QVector3D n132 = QVector3D::normal(v1, v3, v2);
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// Vector Normals
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QVector3D n0 = QVector3D(n023 + n012 + n310).normalized();
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QVector3D n1 = QVector3D(n132 + n012 + n310).normalized();
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QVector3D n2 = QVector3D(n132 + n012 + n023).normalized();
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QVector3D n3 = QVector3D(n132 + n310 + n023).normalized();
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// Colors
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QVector3D red(1.0f, 0.0f, 0.0f);
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QVector3D green(0.0f, 1.0f, 0.0f);
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QVector3D blue(0.0f, 0.0f, 1.0f);
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QVector3D white(1.0f, 1.0f, 1.0f);
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const QList<QVector3D> vertices = { v0, n0, red,
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v1, n1, blue,
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v2, n2, green,
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v3, n3, white };
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// DrawElementIndirect
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{
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Qt3DCore::QEntity *customDrawElementIndirectEntity = new Qt3DCore::QEntity(rootEntity);
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// Transform
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Qt3DCore::QTransform *transform = new Qt3DCore::QTransform;
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transform->setScale(8.0f);
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transform->setTranslation(QVector3D(-10.0f, 0.0, 0.0f));
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// Custom Mesh (TetraHedron)
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Qt3DRender::QGeometryRenderer *customMeshRenderer = new Qt3DRender::QGeometryRenderer;
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Qt3DCore::QGeometry *customGeometry = new Qt3DCore::QGeometry(customMeshRenderer);
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Qt3DCore::QBuffer *vertexDataBuffer = new Qt3DCore::QBuffer(customGeometry);
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Qt3DCore::QBuffer *indexDataBuffer = new Qt3DCore::QBuffer(customGeometry);
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Qt3DCore::QBuffer *indirectDrawDataBuffer = new Qt3DCore::QBuffer(customGeometry);
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// 4 distinct vertices
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QByteArray vertexBufferData;
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vertexBufferData.resize(4 * (3 + 3 + 3) * sizeof(float));
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float *rawVertexArray = reinterpret_cast<float *>(vertexBufferData.data());
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int idx = 0;
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for (const QVector3D &v : vertices) {
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rawVertexArray[idx++] = v.x();
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rawVertexArray[idx++] = v.y();
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rawVertexArray[idx++] = v.z();
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}
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// Indices (12)
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QByteArray indexBufferData;
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indexBufferData.resize(4 * 3 * sizeof(ushort));
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ushort *rawIndexArray = reinterpret_cast<ushort *>(indexBufferData.data());
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// Front
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rawIndexArray[0] = 0;
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rawIndexArray[1] = 1;
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rawIndexArray[2] = 2;
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// Bottom
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rawIndexArray[3] = 3;
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rawIndexArray[4] = 1;
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rawIndexArray[5] = 0;
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// Left
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rawIndexArray[6] = 0;
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rawIndexArray[7] = 2;
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rawIndexArray[8] = 3;
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// Right
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rawIndexArray[9] = 1;
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rawIndexArray[10] = 3;
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rawIndexArray[11] = 2;
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QByteArray indirectBufferData;
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indirectBufferData.resize(sizeof(IndirectElementDrawBuffer));
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IndirectElementDrawBuffer *indirectStruct = reinterpret_cast<IndirectElementDrawBuffer *>(indirectBufferData.data());
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indirectStruct->count = 12U;
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indirectStruct->firstIndex = 0U;
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indirectStruct->baseInstance = 0U;
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indirectStruct->baseVertex = 0U;
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indirectStruct->instancesCount = 1U;
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vertexDataBuffer->setData(vertexBufferData);
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indexDataBuffer->setData(indexBufferData);
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indirectDrawDataBuffer->setData(indirectBufferData);
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// Attributes
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Qt3DCore::QAttribute *positionAttribute = new Qt3DCore::QAttribute();
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positionAttribute->setAttributeType(Qt3DCore::QAttribute::VertexAttribute);
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positionAttribute->setBuffer(vertexDataBuffer);
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positionAttribute->setVertexBaseType(Qt3DCore::QAttribute::Float);
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positionAttribute->setVertexSize(3);
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positionAttribute->setByteOffset(0);
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positionAttribute->setByteStride(9 * sizeof(float));
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positionAttribute->setCount(4);
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positionAttribute->setName(Qt3DCore::QAttribute::defaultPositionAttributeName());
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Qt3DCore::QAttribute *normalAttribute = new Qt3DCore::QAttribute();
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normalAttribute->setAttributeType(Qt3DCore::QAttribute::VertexAttribute);
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normalAttribute->setBuffer(vertexDataBuffer);
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normalAttribute->setVertexBaseType(Qt3DCore::QAttribute::Float);
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normalAttribute->setVertexSize(3);
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normalAttribute->setByteOffset(3 * sizeof(float));
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normalAttribute->setByteStride(9 * sizeof(float));
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normalAttribute->setCount(4);
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normalAttribute->setName(Qt3DCore::QAttribute::defaultNormalAttributeName());
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Qt3DCore::QAttribute *colorAttribute = new Qt3DCore::QAttribute();
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colorAttribute->setAttributeType(Qt3DCore::QAttribute::VertexAttribute);
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colorAttribute->setBuffer(vertexDataBuffer);
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colorAttribute->setVertexBaseType(Qt3DCore::QAttribute::Float);
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colorAttribute->setVertexSize(3);
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colorAttribute->setByteOffset(6 * sizeof(float));
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colorAttribute->setByteStride(9 * sizeof(float));
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colorAttribute->setCount(4);
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colorAttribute->setName(Qt3DCore::QAttribute::defaultColorAttributeName());
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Qt3DCore::QAttribute *indexAttribute = new Qt3DCore::QAttribute();
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indexAttribute->setAttributeType(Qt3DCore::QAttribute::IndexAttribute);
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indexAttribute->setBuffer(indexDataBuffer);
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indexAttribute->setVertexBaseType(Qt3DCore::QAttribute::UnsignedShort);
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indexAttribute->setVertexSize(1);
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indexAttribute->setByteOffset(0);
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indexAttribute->setByteStride(0);
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indexAttribute->setCount(12);
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Qt3DCore::QAttribute *indirectAttribute = new Qt3DCore::QAttribute();
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indirectAttribute->setAttributeType(Qt3DCore::QAttribute::DrawIndirectAttribute);
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indirectAttribute->setBuffer(indirectDrawDataBuffer);
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indirectAttribute->setByteOffset(0);
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indirectAttribute->setByteStride(0);
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indirectAttribute->setCount(1);
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customGeometry->addAttribute(positionAttribute);
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customGeometry->addAttribute(normalAttribute);
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customGeometry->addAttribute(colorAttribute);
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customGeometry->addAttribute(indexAttribute);
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customGeometry->addAttribute(indirectAttribute);
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customMeshRenderer->setInstanceCount(1);
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customMeshRenderer->setIndexOffset(0);
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customMeshRenderer->setFirstInstance(0);
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customMeshRenderer->setPrimitiveType(Qt3DRender::QGeometryRenderer::Triangles);
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customMeshRenderer->setGeometry(customGeometry);
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// 4 faces of 3 points
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customMeshRenderer->setVertexCount(12);
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customDrawElementIndirectEntity->addComponent(customMeshRenderer);
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customDrawElementIndirectEntity->addComponent(transform);
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customDrawElementIndirectEntity->addComponent(material);
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}
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// DrawArrayIndirect
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{
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Qt3DCore::QEntity *customDrawArrayIndirectEntity = new Qt3DCore::QEntity(rootEntity);
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// Transform
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Qt3DCore::QTransform *transform = new Qt3DCore::QTransform;
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transform->setScale(8.0f);
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transform->setTranslation(QVector3D(10.0f, 0.0, 0.0f));
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// Custom Mesh (TetraHedron)
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Qt3DRender::QGeometryRenderer *customMeshRenderer = new Qt3DRender::QGeometryRenderer;
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Qt3DCore::QGeometry *customGeometry = new Qt3DCore::QGeometry(customMeshRenderer);
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Qt3DCore::QBuffer *vertexDataBuffer = new Qt3DCore::QBuffer(customGeometry);
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Qt3DCore::QBuffer *indirectDrawDataBuffer = new Qt3DCore::QBuffer(customGeometry);
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QVector<QVector3D> orderedPositionVertices;
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// 12 vertices with position, normal, color
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orderedPositionVertices.reserve(12 * (1 + 1 + 1));
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orderedPositionVertices << v0 << n0 << red;
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orderedPositionVertices << v1 << n1 << red;
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orderedPositionVertices << v2 << n2 << red;
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orderedPositionVertices << v3 << n3 << green;
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orderedPositionVertices << v1 << n1 << green;
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orderedPositionVertices << v0 << n0 << green;
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orderedPositionVertices << v0 << n0 << blue;
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orderedPositionVertices << v2 << n2 << blue;
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orderedPositionVertices << v3 << n3 << blue;
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orderedPositionVertices << v1 << n1 << white;
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orderedPositionVertices << v3 << n3 << white;
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orderedPositionVertices << v2 << n2 << white;
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QByteArray vertexBufferData;
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vertexBufferData.resize(orderedPositionVertices.size() * sizeof(QVector3D));
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memcpy(vertexBufferData.data(), orderedPositionVertices.data(), orderedPositionVertices.size() * sizeof(QVector3D));
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QByteArray indirectBufferData;
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indirectBufferData.resize(sizeof(IndirectArrayDrawBuffer));
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IndirectArrayDrawBuffer *indirectStruct = reinterpret_cast<IndirectArrayDrawBuffer *>(indirectBufferData.data());
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indirectStruct->count = 12U;
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indirectStruct->baseInstance = 0U;
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indirectStruct->instancesCount = 1U;
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indirectStruct->first = 0U;
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vertexDataBuffer->setData(vertexBufferData);
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indirectDrawDataBuffer->setData(indirectBufferData);
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// Attributes
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Qt3DCore::QAttribute *positionAttribute = new Qt3DCore::QAttribute();
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positionAttribute->setAttributeType(Qt3DCore::QAttribute::VertexAttribute);
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positionAttribute->setBuffer(vertexDataBuffer);
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positionAttribute->setVertexBaseType(Qt3DCore::QAttribute::Float);
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positionAttribute->setVertexSize(3);
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positionAttribute->setByteOffset(0);
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positionAttribute->setByteStride(9 * sizeof(float));
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positionAttribute->setCount(12);
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positionAttribute->setName(Qt3DCore::QAttribute::defaultPositionAttributeName());
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Qt3DCore::QAttribute *normalAttribute = new Qt3DCore::QAttribute();
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normalAttribute->setAttributeType(Qt3DCore::QAttribute::VertexAttribute);
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normalAttribute->setBuffer(vertexDataBuffer);
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normalAttribute->setVertexBaseType(Qt3DCore::QAttribute::Float);
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normalAttribute->setVertexSize(3);
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normalAttribute->setByteOffset(3 * sizeof(float));
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normalAttribute->setByteStride(9 * sizeof(float));
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normalAttribute->setCount(12);
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normalAttribute->setName(Qt3DCore::QAttribute::defaultNormalAttributeName());
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Qt3DCore::QAttribute *colorAttribute = new Qt3DCore::QAttribute();
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colorAttribute->setAttributeType(Qt3DCore::QAttribute::VertexAttribute);
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colorAttribute->setBuffer(vertexDataBuffer);
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colorAttribute->setVertexBaseType(Qt3DCore::QAttribute::Float);
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colorAttribute->setVertexSize(3);
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colorAttribute->setByteOffset(6 * sizeof(float));
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colorAttribute->setByteStride(9 * sizeof(float));
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colorAttribute->setCount(12);
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colorAttribute->setName(Qt3DCore::QAttribute::defaultColorAttributeName());
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Qt3DCore::QAttribute *indirectAttribute = new Qt3DCore::QAttribute();
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indirectAttribute->setAttributeType(Qt3DCore::QAttribute::DrawIndirectAttribute);
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indirectAttribute->setBuffer(indirectDrawDataBuffer);
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indirectAttribute->setByteOffset(0);
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indirectAttribute->setByteStride(0);
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indirectAttribute->setCount(1);
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customGeometry->addAttribute(positionAttribute);
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customGeometry->addAttribute(normalAttribute);
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customGeometry->addAttribute(colorAttribute);
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customGeometry->addAttribute(indirectAttribute);
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customMeshRenderer->setInstanceCount(1);
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customMeshRenderer->setIndexOffset(0);
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customMeshRenderer->setFirstInstance(0);
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customMeshRenderer->setPrimitiveType(Qt3DRender::QGeometryRenderer::Triangles);
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customMeshRenderer->setGeometry(customGeometry);
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// 4 faces of 3 points
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customMeshRenderer->setVertexCount(12);
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customDrawArrayIndirectEntity->addComponent(customMeshRenderer);
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customDrawArrayIndirectEntity->addComponent(transform);
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customDrawArrayIndirectEntity->addComponent(material);
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}
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view.setRootEntity(rootEntity);
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view.show();
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return app.exec();
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}
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