vtkOpenGLRenderer.h

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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkOpenGLRenderer.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#ifndef vtkOpenGLRenderer_h
#define vtkOpenGLRenderer_h

#include "vtkRenderingOpenGLModule.h" // For export macro
#include "vtkRenderer.h"

class vtkOpenGLRendererLayerList; // Pimpl
class vtkRenderPass;
class vtkShaderProgram2;

class VTKRENDERINGOPENGL_EXPORT vtkOpenGLRenderer : public vtkRenderer
{
public:
  static vtkOpenGLRenderer *New();
  vtkTypeMacro(vtkOpenGLRenderer, vtkRenderer);
  void PrintSelf(ostream& os, vtkIndent indent);

  void DeviceRender(void);

  virtual void DeviceRenderOpaqueGeometry();

  virtual void DeviceRenderTranslucentPolygonalGeometry();

  virtual void ClearLights(void);

  virtual void Clear(void);

  int UpdateLights(void);

  int GetDepthPeelingHigherLayer();


  vtkGetObjectMacro(ShaderProgram, vtkShaderProgram2);
  virtual void SetShaderProgram(vtkShaderProgram2 *program);

protected:
  vtkOpenGLRenderer();
  ~vtkOpenGLRenderer();

  void CheckCompilation(unsigned int fragmentShader);

  // Internal method to release graphics resources in any derived renderers.
  virtual void ReleaseGraphicsResources(vtkWindow *w);

  // Picking functions to be implemented by sub-classes
  virtual void DevicePickRender();
  virtual void StartPick(unsigned int pickFromSize);
  virtual void UpdatePickId();
  virtual void DonePick();
  virtual unsigned int GetPickedId();
  virtual unsigned int GetNumPickedIds();
  virtual int GetPickedIds(unsigned int atMost, unsigned int *callerBuffer);
  virtual double GetPickedZ();

  // Ivars used in picking
  class vtkGLPickInfo* PickInfo;

  double PickedZ;

  int NumberOfLightsBound;
  int RenderPeel(int layer);

  friend class vtkOpenGLProperty;
  friend class vtkOpenGLTexture;
  friend class vtkOpenGLImageSliceMapper;
  friend class vtkOpenGLImageResliceMapper;

  int GetUseTextureUniformVariable();

  int GetTextureUniformVariable();

  int DepthPeelingIsSupported;

  int DepthPeelingIsSupportedChecked;

  vtkOpenGLRendererLayerList *LayerList;

  unsigned int OpaqueLayerZ;
  unsigned int TransparentLayerZ;
  unsigned int ProgramShader;


  int ViewportX;
  int ViewportY;
  int ViewportWidth;
  int ViewportHeight;

  unsigned int DepthFormat;

  // Is rendering at translucent geometry stage using depth peeling and
  // rendering a layer other than the first one? (Boolean value)
  // If so, the uniform variables UseTexture and Texture can be set.
  // (Used by vtkOpenGLProperty or vtkOpenGLTexture)
  int DepthPeelingHigherLayer;

  vtkShaderProgram2 *ShaderProgram;

  friend class vtkRenderPass;

private:
  vtkOpenGLRenderer(const vtkOpenGLRenderer&) VTK_DELETE_FUNCTION;
  void operator=(const vtkOpenGLRenderer&) VTK_DELETE_FUNCTION;
};

#endif