vtkWebGPUCellToPrimitiveConverter.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#ifndef vtkWebGPUCellToPrimitiveConverter_h
#define vtkWebGPUCellToPrimitiveConverter_h
 
#include "vtkObject.h"
 
#include "vtkProperty.h"              // for VTK_SURFACE
#include "vtkRenderingWebGPUModule.h" // for export macro
#include "vtkSmartPointer.h"          // for vtkSmartPointer
 
#include "vtk_wgpu.h" // for wgpu::Buffer
 
#include <utility> // for std::pair
 
VTK_ABI_NAMESPACE_BEGIN
class vtkWebGPUConfiguration;
class vtkPolyData;
class vtkCellArray;
class vtkWebGPUComputePass;
class vtkWebGPUComputePipeline;
 
class VTKRENDERINGWEBGPU_EXPORT vtkWebGPUCellToPrimitiveConverter : public vtkObject
{
public:
  static vtkWebGPUCellToPrimitiveConverter* New();
  vtkTypeMacro(vtkWebGPUCellToPrimitiveConverter, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent) override;
 
  void ReleaseGraphicsResources(vtkWindow*);
 
  enum TopologySourceType : int
  {
    // Used to draw VTK_VERTEX and VTK_POLY_VERTEX cell types
    TOPOLOGY_SOURCE_VERTS = 0,
    // Used to draw VTK_LINE and VTK_POLY_LINE cell types.
    TOPOLOGY_SOURCE_LINES,
    // Used to draw only the points of each line segment.
    // Activated when `vtkProperty::Representation` == `VTK_POINTS`
    TOPOLOGY_SOURCE_LINE_POINTS,
    // Used to draw VTK_QUAD, VTK_TRIANGLE and VTK_POLYGON cell types.
    TOPOLOGY_SOURCE_POLYGONS,
    // Used to draw only the corner points of each face.
    // Activated when `vtkProperty::Representation` == `VTK_POINTS`
    TOPOLOGY_SOURCE_POLYGON_POINTS,
    // Used to draw only the edges of each face.
    // Activated when `vtkProperty::Representation` == `VTK_WIREFRAME`
    TOPOLOGY_SOURCE_POLYGON_EDGES,
    NUM_TOPOLOGY_SOURCE_TYPES
  };
 
  bool DispatchMeshToPrimitiveComputePipeline(vtkWebGPUConfiguration* wgpuConfiguration,
    vtkPolyData* mesh, int representation, vtkTypeUInt32* vertexCounts[NUM_TOPOLOGY_SOURCE_TYPES],
    wgpu::Buffer* topologyBuffers[NUM_TOPOLOGY_SOURCE_TYPES],
    wgpu::Buffer* edgeArrayBuffers[NUM_TOPOLOGY_SOURCE_TYPES]);
 
  bool DispatchCellToPrimitiveComputePipeline(vtkWebGPUConfiguration* wgpuConfiguration,
    vtkCellArray* cells, int representation, int cellType, vtkIdType cellIdOffset,
    vtkTypeUInt32* vertexCounts[NUM_TOPOLOGY_SOURCE_TYPES],
    wgpu::Buffer* topologyBuffers[NUM_TOPOLOGY_SOURCE_TYPES],
    wgpu::Buffer* edgeArrayBuffers[NUM_TOPOLOGY_SOURCE_TYPES]);
 
  bool GetNeedToRebuildCellToPrimitiveComputePipeline(
    vtkCellArray* cells, vtkWebGPUCellToPrimitiveConverter::TopologySourceType topologySourceType);
 
  void UpdateCellToPrimitiveComputePipelineTimestamp(
    vtkWebGPUCellToPrimitiveConverter::TopologySourceType topologySourceType);
 
  static vtkIdType GetTessellatedPrimitiveSizeOffsetForCellType(int cellType);
 
  static const char* GetTopologySourceTypeAsString(TopologySourceType topologySourceType);
 
  static const char* GetCellTypeAsString(int cellType);
 
  static const char* GetTessellatedPrimitiveTypeAsString(TopologySourceType topologySourceType);
 
  static std::size_t GetTessellatedPrimitiveSize(TopologySourceType topologySourceType);
 
  static TopologySourceType GetTopologySourceTypeForCellType(
    int cellType, int representation = VTK_SURFACE);
 
protected:
  vtkWebGPUCellToPrimitiveConverter();
  ~vtkWebGPUCellToPrimitiveConverter() override;
 
  // Timestamps help reuse previous resources as much as possible.
  vtkTimeStamp TopologyBuildTimestamp[vtkWebGPUCellToPrimitiveConverter::NUM_TOPOLOGY_SOURCE_TYPES];
  // compute pass speeds up cell to primitive conversions.
  vtkSmartPointer<vtkWebGPUComputePass>
    ComputePasses[vtkWebGPUCellToPrimitiveConverter::NUM_TOPOLOGY_SOURCE_TYPES];
  // compute pipeline to execute the compute pass.
  vtkSmartPointer<vtkWebGPUComputePipeline>
    ComputePipelines[vtkWebGPUCellToPrimitiveConverter::NUM_TOPOLOGY_SOURCE_TYPES];
 
private:
  vtkWebGPUCellToPrimitiveConverter(const vtkWebGPUCellToPrimitiveConverter&) = delete;
  void operator=(const vtkWebGPUCellToPrimitiveConverter&) = delete;
 
  std::pair<vtkSmartPointer<vtkWebGPUComputePass>, vtkSmartPointer<vtkWebGPUComputePipeline>>
  CreateCellToPrimitiveComputePassForCellType(
    vtkSmartPointer<vtkWebGPUConfiguration> wgpuConfiguration,
    TopologySourceType topologySourceType);
};
 
VTK_ABI_NAMESPACE_END
 
#endif