vtkOpenGLRenderUtilities.h

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

  Program:   Visualization Toolkit
  Module:    vtkOpenGLRenderUtilities.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 vtkOpenGLRenderUtilities_h
#define vtkOpenGLRenderUtilities_h

#include "vtkRenderingOpenGL2Module.h" // For export macro
#include "vtkObject.h"

#include "vtk_glew.h" // Needed for GLuint.
#include <string> // for std::string

class vtkOpenGLBufferObject;
class vtkOpenGLRenderWindow;
class vtkOpenGLVertexArrayObject;
class vtkShaderProgram;

class VTKRENDERINGOPENGL2_EXPORT vtkOpenGLRenderUtilities : public vtkObject
{
public:
  vtkTypeMacro(vtkOpenGLRenderUtilities, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent) override;


  static void RenderQuad(
    float *verts, float *tcoords,
    vtkShaderProgram *program, vtkOpenGLVertexArrayObject *vao);
  static void RenderTriangles(
    float *verts, unsigned int numVerts,
    GLuint *indices, unsigned int numIndices,
    float *tcoords,
    vtkShaderProgram *program, vtkOpenGLVertexArrayObject *vao);


  static std::string GetFullScreenQuadVertexShader();
  static std::string GetFullScreenQuadFragmentShaderTemplate();
  static std::string GetFullScreenQuadGeometryShader();
  static bool PrepFullScreenVAO(vtkOpenGLRenderWindow *renWin,
                                vtkOpenGLVertexArrayObject *vao,
                                vtkShaderProgram *prog);
  static void DrawFullScreenQuad();

  // older signsature, we suggest you use the newer signature above
  static bool PrepFullScreenVAO(vtkOpenGLBufferObject *verts,
                                vtkOpenGLVertexArrayObject *vao,
                                vtkShaderProgram *prog);

  static void MarkDebugEvent(const std::string &event);

protected:
  vtkOpenGLRenderUtilities();
  ~vtkOpenGLRenderUtilities() override;

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

#endif