vtkOpenGLQuadHelper.h

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/*=========================================================================
 
  Program:   Visualization Toolkit
 
  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 vtkOpenGLQuadHelper_h
#define vtkOpenGLQuadHelper_h
 
#include "vtkRenderingOpenGL2Module.h" // for export macro
#include "vtkTimeStamp.h"
#include <memory> // for std::unique_ptr
 
class vtkOpenGLRenderWindow;
class vtkOpenGLVertexArrayObject;
class vtkShaderProgram;
class vtkGenericOpenGLResourceFreeCallback;
class vtkWindow;
 
// Helper class to render full screen quads
class VTKRENDERINGOPENGL2_EXPORT vtkOpenGLQuadHelper
{
public:
  vtkShaderProgram* Program;
  vtkTimeStamp ShaderSourceTime;
  vtkOpenGLVertexArrayObject* VAO;
  unsigned int ShaderChangeValue;
 
  // create a quadhelper with the provided shaders
  // if the vertex is nullptr
  // then the default is used. Note that this
  // class should be destroyed upon
  // ReleaseGraphicsResources
  vtkOpenGLQuadHelper(vtkOpenGLRenderWindow*, const char* vs, const char* fs, const char* gs);
 
  ~vtkOpenGLQuadHelper();
 
  // Draw the Quad, will bind the VAO for you
  void Render();
 
  void ReleaseGraphicsResources(vtkWindow*);
 
private:
  vtkOpenGLQuadHelper(const vtkOpenGLQuadHelper&) = delete;
  vtkOpenGLQuadHelper& operator=(const vtkOpenGLQuadHelper&) = delete;
  std::unique_ptr<vtkGenericOpenGLResourceFreeCallback> ResourceCallback;
};
 
#endif // vtkOpenGLQuadHelper_h
 
// VTK-HeaderTest-Exclude: vtkOpenGLQuadHelper.h