vtkWebGPUImageSliceMapper.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
 
#ifndef vtkWebGPUImageSliceMapper_h
#define vtkWebGPUImageSliceMapper_h
 
#include "vtkImageSliceMapper.h"
#include "vtkNew.h"                   // for ivars
#include "vtkRenderingWebGPUModule.h" // For export macro
#include "vtkWrappingHints.h"         // For VTK_MARSHALAUTO
 
VTK_ABI_NAMESPACE_BEGIN
class vtkActor;
class vtkImageSlice;
class vtkOverrideAttribute;
class vtkPolyData;
class vtkRenderer;
class vtkTexture;
class vtkWindow;
 
class VTKRENDERINGWEBGPU_EXPORT VTK_MARSHALAUTO vtkWebGPUImageSliceMapper
  : public vtkImageSliceMapper
{
public:
  vtkTypeMacro(vtkWebGPUImageSliceMapper, vtkImageSliceMapper);
  static vtkWebGPUImageSliceMapper* New();
  VTK_NEWINSTANCE
  static vtkOverrideAttribute* CreateOverrideAttributes();
  void PrintSelf(ostream& os, vtkIndent indent) override;

  void Render(vtkRenderer* renderer, vtkImageSlice* prop) override;

  void ReleaseGraphicsResources(vtkWindow* window) override;
 
protected:
  vtkWebGPUImageSliceMapper();
  ~vtkWebGPUImageSliceMapper() override;

  void BuildTexturedQuad(vtkImageSlice* prop);
 
  vtkNew<vtkActor> ProxyActor;
  vtkNew<vtkPolyData> Quad;
  vtkNew<vtkTexture> Texture;
 
  // The quad and the texture are rebuilt when the input, the displayed extent
  // or the image property changes.
  vtkTimeStamp BuildTime;
  int BuiltExtent[6] = { 0, -1, 0, -1, 0, -1 };
  // What the texture currently holds. MakeTextureData reads these to decide
  // whether it can reuse the existing texture and the input's own memory.
  int TextureSize[2] = { 0, 0 };
  int TextureBytesPerPixel = 4;
 
private:
  vtkWebGPUImageSliceMapper(const vtkWebGPUImageSliceMapper&) = delete;
  void operator=(const vtkWebGPUImageSliceMapper&) = delete;
};
#define vtkWebGPUImageSliceMapper_OVERRIDE_ATTRIBUTES                                              \
  vtkWebGPUImageSliceMapper::CreateOverrideAttributes()
VTK_ABI_NAMESPACE_END
#endif