vtkWebGPUHardwareSelector.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#ifndef vtkWebGPUHardwareSelector_h
#define vtkWebGPUHardwareSelector_h

#include "vtkHardwareSelector.h"

#include "vtkRenderingWebGPUModule.h" // For export macro
#include "vtkTypeUInt32Array.h"
#include "vtkWrappingHints.h" // For VTK_MARSHALAUTO

VTK_ABI_NAMESPACE_BEGIN
class vtkOverrideAttribute;
class VTKRENDERINGWEBGPU_EXPORT VTK_MARSHALAUTO vtkWebGPUHardwareSelector
  : public vtkHardwareSelector
{
public:
  static vtkWebGPUHardwareSelector* New();
  VTK_NEWINSTANCE
  static vtkOverrideAttribute* CreateOverrideAttributes();
  vtkTypeMacro(vtkWebGPUHardwareSelector, vtkHardwareSelector);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  bool CaptureBuffers() override;

  void BeginRenderProp() override {};
  void EndRenderProp() override {};

  void RenderCompositeIndex(unsigned int /*index*/) override {};

  void RenderProcessId(unsigned int /*processid*/) override {};

  // we need to initialize the depth buffer
  void BeginSelection() override;
  void EndSelection() override;

  vtkProp* GetPropFromID(int id) override;

  PixelInformation GetPixelInformation(const unsigned int inDisplayPosition[2], int maxDist,
    unsigned int outSelectedPosition[2]) override;

protected:
  vtkWebGPUHardwareSelector();
  ~vtkWebGPUHardwareSelector() override;

  void PreCapturePass(int /*pass*/) override {};
  void PostCapturePass(int /*pass*/) override {};

  void BeginRenderProp(vtkRenderWindow*) override {};
  void EndRenderProp(vtkRenderWindow*) override {};

  void SavePixelBuffer(int) override {};

  void ReleasePixBuffers() override;

  int Convert(int xx, int yy, unsigned char* pb) override;

private:
  friend class vtkWebGPURenderWindow;
  struct Ids
  {
    vtkTypeUInt32 AttributeId;
    vtkTypeUInt32 PropId;
    vtkTypeUInt32 CompositeId;
    vtkTypeUInt32 ProcessId;
  };

  bool MapReady = false;
  vtkNew<vtkTypeUInt32Array> IdBuffer;

  vtkProp** PropArray = nullptr;

  vtkWebGPUHardwareSelector(const vtkWebGPUHardwareSelector&) = delete;
  void operator=(const vtkWebGPUHardwareSelector&) = delete;
};

#define vtkWebGPUHardwareSelector_OVERRIDE_ATTRIBUTES                                              \
  vtkWebGPUHardwareSelector::CreateOverrideAttributes()
VTK_ABI_NAMESPACE_END
#endif