mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-19 10:35:42 +00:00
5db762ee71
The `From` and `To` nomenclature for topology mapping has been confusing for both users and developers, especially at lower levels where the intention of mapping attributes from one element to another is easily conflated with the concept of mapping indices (which maps in the exact opposite direction). These identifiers have been renamed to `VisitTopology` and `IncidentTopology` to clarify the direction of the mapping. The order in which these template parameters are specified for `WorkletMapTopology` have also been reversed, since eventually there may be more than one `IncidentTopology`, and having `IncidentTopology` at the end will allow us to replace it with a variadic template parameter pack in the future. Other implementation details supporting these worklets, include `Fetch` tags, `Connectivity` classes, and methods on the various `CellSet` classes (such as `PrepareForInput` have also reversed their template arguments. These will need to be cautiously updated. The convenience implementations of `WorkletMapTopology` have been renamed for clarity as follows: ``` WorkletMapPointToCell --> WorkletVisitCellsWithPoints WorkletMapCellToPoint --> WorkletVisitPointsWithCells ``` The `ControlSignature` tags have been renamed as follows: ``` FieldInTo --> FieldInVisit FieldInFrom --> FieldInMap FromCount --> IncidentElementCount FromIndices --> IncidentElementIndices ```
374 lines
12 KiB
C++
374 lines
12 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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//
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//============================================================================
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#include <vtkm/Assert.h>
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#include <vtkm/cont/DeviceAdapterAlgorithm.h>
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#include <vtkm/cont/TryExecute.h>
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#include <vtkm/exec/CellEdge.h>
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#include <vtkm/filter/ExternalFaces.h>
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#include <vtkm/rendering/CanvasRayTracer.h>
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#include <vtkm/rendering/MapperRayTracer.h>
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#include <vtkm/rendering/MapperWireframer.h>
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#include <vtkm/rendering/Wireframer.h>
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#include <vtkm/worklet/DispatcherMapField.h>
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#include <vtkm/worklet/DispatcherMapTopology.h>
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#include <vtkm/worklet/ScatterCounting.h>
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#include <vtkm/worklet/WorkletMapField.h>
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#include <vtkm/worklet/WorkletMapTopology.h>
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namespace vtkm
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{
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namespace rendering
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{
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namespace
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{
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class CreateConnectivity : public vtkm::worklet::WorkletMapField
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{
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public:
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VTKM_CONT
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CreateConnectivity() {}
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using ControlSignature = void(FieldIn, WholeArrayOut);
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using ExecutionSignature = void(_1, _2);
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template <typename ConnPortalType>
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VTKM_EXEC void operator()(const vtkm::Id& i, ConnPortalType& connPortal) const
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{
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connPortal.Set(i * 2 + 0, i);
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connPortal.Set(i * 2 + 1, i + 1);
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}
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}; // conn
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class Convert1DCoordinates : public vtkm::worklet::WorkletMapField
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{
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private:
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bool LogY;
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bool LogX;
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public:
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VTKM_CONT
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Convert1DCoordinates(bool logY, bool logX)
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: LogY(logY)
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, LogX(logX)
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{
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}
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using ControlSignature = void(FieldIn, FieldIn, FieldOut, FieldOut);
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using ExecutionSignature = void(_1, _2, _3, _4);
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template <typename ScalarType>
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VTKM_EXEC void operator()(const vtkm::Vec3f_32& inCoord,
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const ScalarType& scalar,
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vtkm::Vec3f_32& outCoord,
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vtkm::Float32& fieldOut) const
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{
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//
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// Rendering supports lines based on a cellSetStructured<1>
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// where only the x coord matters. It creates a y based on
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// the scalar values and connects all the points with lines.
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// So, we need to convert it back to something that can
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// actually be rendered.
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//
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outCoord[0] = inCoord[0];
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outCoord[1] = static_cast<vtkm::Float32>(scalar);
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outCoord[2] = 0.f;
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if (LogY)
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{
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outCoord[1] = vtkm::Log10(outCoord[1]);
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}
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if (LogX)
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{
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outCoord[0] = vtkm::Log10(outCoord[0]);
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}
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// all lines have the same color
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fieldOut = 1.f;
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}
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}; // convert coords
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#if defined(VTKM_MSVC)
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#pragma warning(push)
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#pragma warning(disable : 4127) //conditional expression is constant
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#endif
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struct EdgesCounter : public vtkm::worklet::WorkletVisitCellsWithPoints
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{
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using ControlSignature = void(CellSetIn cellSet, FieldOutCell numEdges);
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using ExecutionSignature = _2(CellShape shape, PointCount numPoints);
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using InputDomain = _1;
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template <typename CellShapeTag>
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VTKM_EXEC vtkm::IdComponent operator()(CellShapeTag shape, vtkm::IdComponent numPoints) const
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{
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//TODO: Remove the if/then with templates.
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if (shape.Id == vtkm::CELL_SHAPE_LINE)
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{
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return 1;
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}
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else
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{
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return vtkm::exec::CellEdgeNumberOfEdges(numPoints, shape, *this);
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}
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}
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}; // struct EdgesCounter
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struct EdgesExtracter : public vtkm::worklet::WorkletVisitCellsWithPoints
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{
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using ControlSignature = void(CellSetIn cellSet, FieldOutCell edgeIndices);
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using ExecutionSignature = void(CellShape, PointIndices, VisitIndex, _2);
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using InputDomain = _1;
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using ScatterType = vtkm::worklet::ScatterCounting;
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VTKM_CONT
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template <typename CountArrayType>
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static ScatterType MakeScatter(const CountArrayType& counts)
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{
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return ScatterType(counts);
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}
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template <typename CellShapeTag, typename PointIndexVecType, typename EdgeIndexVecType>
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VTKM_EXEC void operator()(CellShapeTag shape,
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const PointIndexVecType& pointIndices,
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vtkm::IdComponent visitIndex,
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EdgeIndexVecType& edgeIndices) const
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{
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//TODO: Remove the if/then with templates.
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vtkm::Id p1, p2;
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if (shape.Id == vtkm::CELL_SHAPE_LINE)
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{
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p1 = pointIndices[0];
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p2 = pointIndices[1];
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}
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else
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{
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p1 = pointIndices[vtkm::exec::CellEdgeLocalIndex(
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pointIndices.GetNumberOfComponents(), 0, visitIndex, shape, *this)];
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p2 = pointIndices[vtkm::exec::CellEdgeLocalIndex(
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pointIndices.GetNumberOfComponents(), 1, visitIndex, shape, *this)];
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}
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// These indices need to be arranged in a definite order, as they will later be sorted to
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// detect duplicates
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edgeIndices[0] = p1 < p2 ? p1 : p2;
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edgeIndices[1] = p1 < p2 ? p2 : p1;
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}
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}; // struct EdgesExtracter
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#if defined(VTKM_MSVC)
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#pragma warning(pop)
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#endif
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} // namespace
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struct MapperWireframer::InternalsType
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{
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InternalsType()
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: InternalsType(nullptr, false, false)
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{
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}
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InternalsType(vtkm::rendering::Canvas* canvas, bool showInternalZones, bool isOverlay)
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: Canvas(canvas)
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, ShowInternalZones(showInternalZones)
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, IsOverlay(isOverlay)
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, CompositeBackground(true)
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{
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}
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vtkm::rendering::Canvas* Canvas;
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bool ShowInternalZones;
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bool IsOverlay;
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bool CompositeBackground;
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}; // struct MapperWireframer::InternalsType
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MapperWireframer::MapperWireframer()
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: Internals(new InternalsType(nullptr, false, false))
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{
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}
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MapperWireframer::~MapperWireframer()
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{
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}
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vtkm::rendering::Canvas* MapperWireframer::GetCanvas() const
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{
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return this->Internals->Canvas;
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}
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void MapperWireframer::SetCanvas(vtkm::rendering::Canvas* canvas)
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{
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this->Internals->Canvas = canvas;
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}
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bool MapperWireframer::GetShowInternalZones() const
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{
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return this->Internals->ShowInternalZones;
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}
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void MapperWireframer::SetShowInternalZones(bool showInternalZones)
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{
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this->Internals->ShowInternalZones = showInternalZones;
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}
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bool MapperWireframer::GetIsOverlay() const
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{
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return this->Internals->IsOverlay;
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}
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void MapperWireframer::SetIsOverlay(bool isOverlay)
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{
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this->Internals->IsOverlay = isOverlay;
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}
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void MapperWireframer::StartScene()
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{
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// Nothing needs to be done.
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}
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void MapperWireframer::EndScene()
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{
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// Nothing needs to be done.
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}
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void MapperWireframer::RenderCells(const vtkm::cont::DynamicCellSet& inCellSet,
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const vtkm::cont::CoordinateSystem& coords,
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const vtkm::cont::Field& inScalarField,
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const vtkm::cont::ColorTable& colorTable,
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const vtkm::rendering::Camera& camera,
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const vtkm::Range& scalarRange)
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{
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vtkm::cont::DynamicCellSet cellSet = inCellSet;
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bool is1D = cellSet.IsSameType(vtkm::cont::CellSetStructured<1>());
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vtkm::cont::CoordinateSystem actualCoords = coords;
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vtkm::cont::Field actualField = inScalarField;
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if (is1D)
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{
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bool isSupportedField =
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inScalarField.GetAssociation() == vtkm::cont::Field::Association::POINTS;
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if (!isSupportedField)
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{
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throw vtkm::cont::ErrorBadValue(
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"WireFramer: field must be associated with points for 1D cell set");
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}
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vtkm::cont::ArrayHandle<vtkm::Vec3f_32> newCoords;
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vtkm::cont::ArrayHandle<vtkm::Float32> newScalars;
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//
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// Convert the cell set into something we can draw
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//
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vtkm::worklet::DispatcherMapField<Convert1DCoordinates>(
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Convert1DCoordinates(this->LogarithmY, this->LogarithmX))
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.Invoke(coords.GetData(),
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inScalarField.GetData().ResetTypes(vtkm::TypeListTagFieldScalar()),
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newCoords,
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newScalars);
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actualCoords = vtkm::cont::CoordinateSystem("coords", newCoords);
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actualField = vtkm::cont::Field(
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inScalarField.GetName(), vtkm::cont::Field::Association::POINTS, newScalars);
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vtkm::Id numCells = cellSet.GetNumberOfCells();
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vtkm::cont::ArrayHandle<vtkm::Id> conn;
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vtkm::cont::ArrayHandleCounting<vtkm::Id> iter =
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vtkm::cont::make_ArrayHandleCounting(vtkm::Id(0), vtkm::Id(1), numCells);
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conn.Allocate(numCells * 2);
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vtkm::worklet::DispatcherMapField<CreateConnectivity>(CreateConnectivity()).Invoke(iter, conn);
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vtkm::cont::CellSetSingleType<> newCellSet("cells");
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newCellSet.Fill(newCoords.GetNumberOfValues(), vtkm::CELL_SHAPE_LINE, 2, conn);
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cellSet = vtkm::cont::DynamicCellSet(newCellSet);
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}
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bool isLines = false;
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// Check for a cell set that is already lines
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// Since there is no need to de external faces or
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// render the depth of the mesh to hide internal zones
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if (cellSet.IsSameType(vtkm::cont::CellSetSingleType<>()))
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{
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auto singleType = cellSet.Cast<vtkm::cont::CellSetSingleType<>>();
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isLines = singleType.GetCellShape(0) == vtkm::CELL_SHAPE_LINE;
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}
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bool doExternalFaces = !(this->Internals->ShowInternalZones) && !isLines && !is1D;
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if (doExternalFaces)
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{
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// If internal zones are to be hidden, the number of edges processed can be reduced by
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// running the external faces filter on the input cell set.
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vtkm::cont::DataSet dataSet;
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dataSet.AddCoordinateSystem(actualCoords);
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dataSet.AddCellSet(inCellSet);
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dataSet.AddField(inScalarField);
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vtkm::filter::ExternalFaces externalFaces;
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externalFaces.SetCompactPoints(false);
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externalFaces.SetPassPolyData(true);
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vtkm::cont::DataSet output = externalFaces.Execute(dataSet);
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cellSet = output.GetCellSet();
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actualField = output.GetField(0);
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}
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// Extract unique edges from the cell set.
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vtkm::cont::ArrayHandle<vtkm::IdComponent> counts;
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vtkm::cont::ArrayHandle<vtkm::Id2> edgeIndices;
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vtkm::worklet::DispatcherMapTopology<EdgesCounter>().Invoke(cellSet, counts);
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vtkm::worklet::DispatcherMapTopology<EdgesExtracter> extractDispatcher(
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EdgesExtracter::MakeScatter(counts));
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extractDispatcher.Invoke(cellSet, edgeIndices);
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vtkm::cont::Algorithm::template Sort<vtkm::Id2>(edgeIndices);
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vtkm::cont::Algorithm::template Unique<vtkm::Id2>(edgeIndices);
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Wireframer renderer(
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this->Internals->Canvas, this->Internals->ShowInternalZones, this->Internals->IsOverlay);
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// Render the cell set using a raytracer, on a separate canvas, and use the generated depth
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// buffer, which represents the solid mesh, to avoid drawing on the internal zones
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bool renderDepth =
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!(this->Internals->ShowInternalZones) && !(this->Internals->IsOverlay) && !isLines && !is1D;
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if (renderDepth)
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{
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CanvasRayTracer canvas(this->Internals->Canvas->GetWidth(),
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this->Internals->Canvas->GetHeight());
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canvas.SetBackgroundColor(vtkm::rendering::Color::white);
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canvas.Initialize();
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canvas.Activate();
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canvas.Clear();
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MapperRayTracer raytracer;
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raytracer.SetCanvas(&canvas);
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raytracer.SetActiveColorTable(colorTable);
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raytracer.RenderCells(cellSet, actualCoords, actualField, colorTable, camera, scalarRange);
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renderer.SetSolidDepthBuffer(canvas.GetDepthBuffer());
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}
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else
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{
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renderer.SetSolidDepthBuffer(this->Internals->Canvas->GetDepthBuffer());
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}
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renderer.SetCamera(camera);
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renderer.SetColorMap(this->ColorMap);
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renderer.SetData(actualCoords, edgeIndices, actualField, scalarRange);
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renderer.Render();
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if (this->Internals->CompositeBackground)
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{
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this->Internals->Canvas->BlendBackground();
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}
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}
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void MapperWireframer::SetCompositeBackground(bool on)
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{
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this->Internals->CompositeBackground = on;
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}
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vtkm::rendering::Mapper* MapperWireframer::NewCopy() const
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{
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return new vtkm::rendering::MapperWireframer(*this);
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}
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}
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} // namespace vtkm::rendering
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