View2DShader.h

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/*************************************************************************************
**
** Copyright 2007, MeVis Medical Solutions AG
**
** The user may use this file in accordance with the license agreement provided with
** the Software or, alternatively, in accordance with the terms contained in a
** written agreement between the user and MeVis Medical Solutions AG.
**
** For further information use the contact form at https://www.mevislab.de/contact
**
**************************************************************************************/
 
 
 
#pragma once
 
#include "SoView2DSystem.h"
#include "mlDataTypes.h"
 
#include <Inventor/SbLinear.h>
#include "View2DTexture.h"
#include "mlGLResourceManager.h"
 
#define VIEW2D_BICUBIC_FILTER_TEX_SIZE 256
 
// declare the LUTData
ML_START_NAMESPACE
template <typename T> class LUTData;
ML_END_NAMESPACE
 
class SOVIEW2D_API View2DShader
{
public:
  View2DShader();
  virtual ~View2DShader();
 
  virtual const char* name() = 0;
 
  virtual void bind(View2DTexture* texture, int tw, int th) = 0;
 
  virtual void unbind() = 0;
 
  virtual void getRequiredTextureLayout(View2DTexture *texture, GLuint &format, GLuint &internalFormat, GLuint &transferDataType);
 
  virtual void setLut(View2DLut* newLut) { _lut = newLut; }
 
  View2DLut* getLut() { return _lut; }
 
  void invalidateLut() { _lastLutChangeID.reset(); }
 
  virtual void bindLutTexture() {};
 
  virtual void bindFilterKernelTexture() {};
 
  static void applyTextureFilter(View2DTextureFilter filter);
 
  virtual float getLutHeightScaleFactor() { return 0.; }
 
  virtual SbVec2s getLutTextureSize() { return SbVec2s(); }
 
protected:
 
  View2DLut* _lut;
 
  ml::LUTDataId _lastLutChangeID;
 
  int _lastLutSize;
};
 
//-----------------------------------------------------------------------------------------------
class SOVIEW2D_API View2DTextureLUTShader : public View2DShader
{
public:
  View2DTextureLUTShader();
  ~View2DTextureLUTShader() override;
 
  void bindFilterKernelTexture() override;
 
  void bindLutTexture() override;
 
  float getLutHeightScaleFactor() override;
 
  SbVec2s getLutTextureSize() override;
 
protected:
  void createLutTexture();
 
  void updateLutTexture();
 
  void destroyLutTexture();
 
  void createFilterKernelTexture();
  void destroyFilterKernelTexture();
 
  static GLint desiredLutTextureFormat();
 
  ml::GLTexture _lutTexture;
  GLint _lutTextureFormat;
 
  ml::GLTexture _kernelTexture;
 
  int    _lutTextureWidth;
  int    _lutTextureHeight;
  int    _lutHeight;
};