vtkEGLRenderWindowInternals.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
 
#ifndef vtkEGLRenderWindowInternals_h
#define vtkEGLRenderWindowInternals_h
 
#include "Private/vtkEGLConfig.h"
#include "vtkOpenGLRenderer.h"
 
#include "vtk_glad.h" // OpenGL functions
#include "vtkglad/include/glad/egl.h"
 
VTK_ABI_NAMESPACE_BEGIN
 
class vtkRecti;
class vtkRendererCollection;

class VTKRENDERINGOPENGL2_EXPORT vtkEGLRenderWindowInternals
{
public:
  [[nodiscard]] EGLDisplay GetDisplay() const { return this->Display; }

  [[nodiscard]] EGLDisplay GetSurface() const { return this->Surface; }


  [[nodiscard]] EGLContext GetContext() const { return this->Context; }
  void SetContext(EGLContext context) { this->Context = context; }

  void SetWindow(EGLNativeWindowType window) { this->Window = window; }

  [[nodiscard]] int GetNumberOfDevices();

  [[nodiscard]] bool SetDeviceAsDisplay(int deviceIndex);

  void DestroyWindow();

  void ConfigureWindow(int width, int height);

  void SetDeviceIndex(int deviceIndex) { this->DeviceIndex = deviceIndex; };

  void SetUseOnscreenRendering(bool useOnscreenRendering);

  void GetSizeFromSurface(int* size);

  void ReleaseCurrent();

  bool MakeCurrent();
 
  vtkEGLRenderWindowInternals();
  ~vtkEGLRenderWindowInternals() = default;

  bool IsMesaSoftwareRenderer() const;
 
private:
  bool TryInitializeMesaSoftware(EGLint& major, EGLint& minor);

  bool TryInitializeHardware(int deviceIndex, EGLint& major, EGLint& minor);

  bool FinalizeDisplaySetup(EGLint major, EGLint minor);

  void InitializeOffscreenFramebuffer();

  void DestroyOffscreenFramebuffer();
 
  EGLNativeWindowType Window;
  EGLDisplay Display;
  EGLSurface Surface;
  EGLContext Context;
 
  int DeviceIndex = -1;
  bool UseOnscreenRendering = false;
 
  std::unique_ptr<vtkEGLConfig> Config;
 
  unsigned int Height = 0;
  unsigned int Width = 0;
 
  unsigned int SurfacelessFBO = 0;
  unsigned int ColorTexture = 0;
  unsigned int DepthBuffer = 0;
};
 
VTK_ABI_NAMESPACE_END
#endif