vtkOpenXRManagerOpenGLGraphics.h

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

#include "vtkOpenXRManagerGraphics.h"
#include "vtkRenderingOpenXRModule.h" // For export macro

#include "vtkRenderingOpenGLConfigure.h" // For VTK_USE_X / WIN32

#include <memory> // For shared_ptr
#include <vector> // For std::vector

// Forward declare the graphics binding struct depending on the platform being used
#ifdef VTK_USE_X
struct XrGraphicsBindingOpenGLXlibKHR;
typedef XrGraphicsBindingOpenGLXlibKHR XrGraphicsBindingOpenGL;
#elif defined(_WIN32)
struct XrGraphicsBindingOpenGLWin32KHR;
typedef XrGraphicsBindingOpenGLWin32KHR XrGraphicsBindingOpenGL;
#endif
struct XrSwapchainImageOpenGLKHR;

namespace vtk::detail
{
VTK_ABI_NAMESPACE_BEGIN
class vtkOpenXRManager;
VTK_ABI_NAMESPACE_END
}

VTK_ABI_NAMESPACE_BEGIN
class VTKRENDERINGOPENXR_EXPORT vtkOpenXRManagerOpenGLGraphics : public vtkOpenXRManagerGraphics
{
public:
  static vtkOpenXRManagerOpenGLGraphics* New();
  vtkTypeMacro(vtkOpenXRManagerOpenGLGraphics, vtkOpenXRManagerGraphics);

  void SetNumberOfSwapchains(uint32_t viewCount) override;


  void GetColorSwapchainImage(uint32_t scIndex, uint32_t imgIndex, void* texture) override;
  void GetDepthSwapchainImage(uint32_t scIndex, uint32_t imgIndex, void* texture) override;


  void EnumerateColorSwapchainImages(XrSwapchain swapchain, uint32_t scIndex) override;
  void EnumerateDepthSwapchainImages(XrSwapchain swapchain, uint32_t scIndex) override;


  const std::vector<int64_t>& GetSupportedColorFormats() override;
  const std::vector<int64_t>& GetSupportedDepthFormats() override;

  bool CreateGraphicsBinding(vtkOpenGLRenderWindow* helperWindow) override;

  const void* GetGraphicsBinding() override { return this->GraphicsBinding.get(); };

  const char* GetBackendExtensionName() override;

protected:
  vtkOpenXRManagerOpenGLGraphics();
  ~vtkOpenXRManagerOpenGLGraphics() override;

  struct SwapchainImagesOpenGL
  {
    std::vector<XrSwapchainImageOpenGLKHR> Images;
  };

  void EnumerateSwapchainImages(XrSwapchain swapchain, SwapchainImagesOpenGL& swapchainImages);

  std::shared_ptr<XrGraphicsBindingOpenGL> GraphicsBinding;

  bool CheckGraphicsRequirements(vtk::detail::vtkOpenXRManager& manager) override;

private:
  vtkOpenXRManagerOpenGLGraphics(const vtkOpenXRManagerOpenGLGraphics&) = delete;
  void operator=(const vtkOpenXRManagerOpenGLGraphics&) = delete;

  class PIMPL;
  PIMPL* Private;
};

VTK_ABI_NAMESPACE_END
#endif