vtkOpenGLTextureFramebufferNormalization.h

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

#include "vtkOpenGLTextureNormalizationHelper.h"
#include "vtkRenderingOpenGL2Module.h"
#include "vtkWrappingHints.h" // For VTK_MARSHALAUTO
#include "vtk_glad.h"

VTK_ABI_NAMESPACE_BEGIN
class vtkOpenGLRenderWindow;

class VTKRENDERINGOPENGL2_EXPORT VTK_MARSHALAUTO vtkOpenGLTextureFramebufferNormalization
  : public vtkOpenGLTextureNormalizationHelper
{
public:
  static vtkOpenGLTextureFramebufferNormalization* New();
  vtkTypeMacro(vtkOpenGLTextureFramebufferNormalization, vtkOpenGLTextureNormalizationHelper);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  void Initialize(vtkOpenGLRenderWindow* context);

  bool ConvertUShortToFloat(const void* sourceData, size_t numValues, int numComps,
    unsigned int targetTexture, unsigned int width, unsigned int height) override;

  bool ConvertShortToFloat(const void* sourceData, size_t numValues, int numComps,
    unsigned int targetTexture, unsigned int width, unsigned int height) override;

protected:
  vtkOpenGLTextureFramebufferNormalization();
  ~vtkOpenGLTextureFramebufferNormalization() override;

  vtkOpenGLRenderWindow* Context = nullptr;
  GLuint ConversionProgram = 0;
  GLuint IntermediateTexture = 0;
  GLuint ConversionFramebuffer = 0;
  GLuint ConversionVAO = 0;

  bool InitializeConversionShader();
  bool UploadToIntermediateTexture(const void* sourceData, size_t numValues, int numComps,
    unsigned int width, unsigned int height, GLenum internalFormat, GLenum dataFormat);
  bool PerformFramebufferConversion(unsigned int targetTexture, int numComps, unsigned int width,
    unsigned int height, float scaleFactor);

private:
  vtkOpenGLTextureFramebufferNormalization(
    const vtkOpenGLTextureFramebufferNormalization&) = delete;
  void operator=(const vtkOpenGLTextureFramebufferNormalization&) = delete;
};

VTK_ABI_NAMESPACE_END
#endif // vtkOpenGLTextureFramebufferNormalization_h