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| ** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB). |
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| |
| #include "tessellatedquadmesh.h" |
| |
| #include <Qt3DRender/qattribute.h> |
| #include <Qt3DRender/qbuffer.h> |
| #include <Qt3DRender/qgeometry.h> |
| |
| class TessellatedGeometry : public Qt3DRender::QGeometry |
| { |
| Q_OBJECT |
| public: |
| TessellatedGeometry(Qt3DCore::QNode *parent = nullptr) |
| : Qt3DRender::QGeometry(parent) |
| , m_positionAttribute(new Qt3DRender::QAttribute(this)) |
| , m_vertexBuffer(new Qt3DRender::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(Qt3DRender::QAttribute::defaultPositionAttributeName()); |
| m_positionAttribute->setVertexBaseType(Qt3DRender::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: |
| Qt3DRender::QAttribute *m_positionAttribute; |
| Qt3DRender::QBuffer *m_vertexBuffer; |
| }; |
| |
| TessellatedQuadMesh::TessellatedQuadMesh(Qt3DCore::QNode *parent) |
| : Qt3DRender::QGeometryRenderer(parent) |
| { |
| setPrimitiveType(Qt3DRender::QGeometryRenderer::Patches); |
| setVerticesPerPatch(4); |
| setGeometry(new TessellatedGeometry(this)); |
| } |
| |
| #include "tessellatedquadmesh.moc" |