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50
51#include "tessellatedquadmesh.h"
52
53#include <Qt3DRender/qattribute.h>
54#include <Qt3DRender/qbuffer.h>
55#include <Qt3DRender/qgeometry.h>
56
57class TessellatedGeometry : public Qt3DRender::QGeometry
58{
59 Q_OBJECT
60public:
61 TessellatedGeometry(Qt3DCore::QNode *parent = nullptr)
62 : Qt3DRender::QGeometry(parent)
63 , m_positionAttribute(new Qt3DRender::QAttribute(this))
64 , m_vertexBuffer(new Qt3DRender::QBuffer(this))
65 {
66 const float positionData[] = {
67 -0.8f, -0.8f, 0.0f,
68 0.8f, -0.8f, 0.0f,
69 0.8f, 0.8f, 0.0f,
70 -0.8f, 0.8f, 0.0f
71 };
72
73 const int nVerts = 4;
74 const int size = nVerts * 3 * sizeof(float);
75 QByteArray positionBytes;
76 positionBytes.resize(size);
77 memcpy(dest: positionBytes.data(), src: positionData, n: size);
78
79 m_vertexBuffer->setData(positionBytes);
80
81 m_positionAttribute->setName(Qt3DRender::QAttribute::defaultPositionAttributeName());
82 m_positionAttribute->setVertexBaseType(Qt3DRender::QAttribute::Float);
83 m_positionAttribute->setVertexSize(3);
84 m_positionAttribute->setCount(nVerts);
85 m_positionAttribute->setByteStride(3 * sizeof(float));
86 m_positionAttribute->setBuffer(m_vertexBuffer);
87
88 addAttribute(attribute: m_positionAttribute);
89 }
90
91private:
92 Qt3DRender::QAttribute *m_positionAttribute;
93 Qt3DRender::QBuffer *m_vertexBuffer;
94};
95
96TessellatedQuadMesh::TessellatedQuadMesh(Qt3DCore::QNode *parent)
97 : Qt3DRender::QGeometryRenderer(parent)
98{
99 setPrimitiveType(Qt3DRender::QGeometryRenderer::Patches);
100 setVerticesPerPatch(4);
101 setGeometry(new TessellatedGeometry(this));
102}
103
104#include "tessellatedquadmesh.moc"
105

source code of qt3d/tests/manual/tessellation-modes/tessellatedquadmesh.cpp