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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 vtkShaderProgram_h
#define vtkShaderProgram_h

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

#include <string> // For member variables.
#include <map>    // For member variables.

class vtkMatrix3x3;
class vtkMatrix4x4;
class vtkShader;
class VertexArrayObject;
class vtkWindow;

class VTKRENDERINGOPENGL2_EXPORT vtkShaderProgram : public vtkObject
{
public:
  static vtkShaderProgram *New();
  vtkTypeMacro(vtkShaderProgram, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);


  vtkGetObjectMacro(VertexShader, vtkShader);


  vtkGetObjectMacro(FragmentShader, vtkShader);


  vtkGetObjectMacro(GeometryShader, vtkShader);


  vtkGetMacro(Compiled, bool);
  vtkSetMacro(Compiled, bool);
  vtkBooleanMacro(Compiled, bool);


  std::string GetMD5Hash() const { return this->MD5Hash; }
  void SetMD5Hash(const std::string &hash) { this->MD5Hash = hash; }


  enum NormalizeOption {
    Normalize,
    NoNormalize
  };


  bool isBound() const { return this->Bound; }

  void ReleaseGraphicsResources(vtkWindow *win);

  int GetHandle() const { return Handle; }

  std::string GetError() const { return Error; }

  bool EnableAttributeArray(const char *name);

  bool DisableAttributeArray(const char *name);

  bool UseAttributeArray(const char *name, int offset, size_t stride,
                         int elementType, int elementTupleSize,
                         NormalizeOption normalize);

  template <class T>
  bool SetAttributeArray(const char *name, const T &array,
                         int tupleSize, NormalizeOption normalize);

  bool SetUniformi(const char *name, int v);
  bool SetUniformf(const char *name, float v);
  bool SetUniform2i(const char *name, const int v[2]);
  bool SetUniform2f(const char *name, const float v[2]);
  bool SetUniform3f(const char *name, const float v[3]);
  bool SetUniform4f(const char *name, const float v[4]);
  bool SetUniform3uc(const char *name, const unsigned char v[3]); // maybe remove
  bool SetUniform4uc(const char *name, const unsigned char v[4]); // maybe remove
  bool SetUniformMatrix(const char *name, vtkMatrix3x3 *v);
  bool SetUniformMatrix(const char *name, vtkMatrix4x4 *v);
  bool SetUniformMatrix3x3(const char *name, float *v);
  bool SetUniformMatrix4x4(const char *name, float *v);

  bool SetUniform1iv(const char *name, const int count, const int *f);
  bool SetUniform1fv(const char *name, const int count, const float *f);
  bool SetUniform2fv(const char *name, const int count, const float (*f)[2]);
  bool SetUniform3fv(const char *name, const int count, const float (*f)[3]);
  bool SetUniform4fv(const char *name, const int count, const float (*f)[4]);

protected:
  vtkShaderProgram();
  ~vtkShaderProgram();

  /***************************************************************
   * The following functions are only for use by the shader cache
   * which is why they are protected and that class is a friend
   * you need to use the shader cache to compile/link/bind your shader
   * do not try to do it yourself as it will screw up the cache
   ***************************************************************/
   friend class vtkOpenGLShaderCache;

  bool AttachShader(const vtkShader *shader);

  bool DetachShader(const vtkShader *shader);

  virtual int CompileShader();

  bool Link();

  bool Bind();

  void Release();

  /************* end **************************************/

  vtkShader *VertexShader;
  vtkShader *FragmentShader;
  vtkShader *GeometryShader;

  // hash of the shader program
  std::string MD5Hash;

  bool SetAttributeArrayInternal(const char *name, void *buffer,
                                 int type, int tupleSize,
                                 NormalizeOption normalize);
  int Handle;
  int VertexShaderHandle;
  int FragmentShaderHandle;

  bool Linked;
  bool Bound;
  bool Compiled;

  std::string Error;

  std::map<std::string, int> Attributes;

  friend class VertexArrayObject;

private:
  int FindAttributeArray(const char *name);
  int FindUniform(const char *name);

  vtkShaderProgram(const vtkShaderProgram&);  // Not implemented.
  void operator=(const vtkShaderProgram&);  // Not implemented.
};


#endif