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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 vtkglVertexArrayObject_h
#define vtkglVertexArrayObject_h

#include "vtkRenderingOpenGL2Module.h"
#include <string> // For API.

class vtkShaderProgram;

namespace vtkgl
{
class BufferObject;

class VTKRENDERINGOPENGL2_EXPORT VertexArrayObject
{
public:
  VertexArrayObject();
  ~VertexArrayObject();

  void Bind();

  void Release();

  void ReleaseGraphicsResources();

  void ShaderProgramChanged();

  bool AddAttributeArray(vtkShaderProgram *program, BufferObject &buffer,
                         const std::string &name, int offset, size_t stride,
                         int elementType, int elementTupleSize, bool normalize)
    {
    return this->AddAttributeArrayWithDivisor(program, buffer, name,
      offset,stride,elementType, elementTupleSize, normalize, 0, false);
    }

  bool AddAttributeArrayWithDivisor(vtkShaderProgram *program, BufferObject &buffer,
                         const std::string &name, int offset, size_t stride,
                         int elementType, int elementTupleSize, bool normalize,
                         int divisor, bool isMatrix);

  bool AddAttributeMatrixWithDivisor(vtkShaderProgram *program, BufferObject &buffer,
                         const std::string &name, int offset, size_t stride,
                         int elementType, int elementTupleSize, bool normalize,
                         int divisor);

  bool RemoveAttributeArray(const std::string &name);

  // Force this VAO to emulate a vertex aray object even if
  // the system supports VAOs. This can be useful in cases where
  // the vertex array object does not handle all extensions.
  void SetForceEmulation(bool val);

private:
  class Private;
  Private *d;
};

} // End of vtkgl namespace

#endif // vtkglVertexArrayObject_h

// VTK-HeaderTest-Exclude: vtkglVertexArrayObject.h