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

  Program:   Visualization Toolkit
  Module:    vtkShaderProgram2.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 vtkShaderProgram2_h
#define vtkShaderProgram2_h

#include <cassert> // for templated functions
#include "vtkRenderingOpenGLModule.h" // for export macro
#include "vtkWeakPointer.h" // for weak ptr to rendering context
#include "vtkObject.h"

class vtkRenderWindow;
class vtkOpenGLExtensionManager;
class vtkShader2Collection;
class vtkUniformVariables;

// Values for GetLastBuildStatus()
enum vtkShaderProgram2BuildStatus
{
  // one of the shaders failed to compile
  VTK_SHADER_PROGRAM2_COMPILE_FAILED=0,
  // all the shaders compiled successfully but the link failed
  VTK_SHADER_PROGRAM2_LINK_FAILED=1,
  // all the shaders compiled successfully and the link succeeded
  VTK_SHADER_PROGRAM2_LINK_SUCCEEDED=2
};

enum vtkShaderProgram2GeometryInType
{
  VTK_GEOMETRY_SHADER_IN_TYPE_POINTS,
  VTK_GEOMETRY_SHADER_IN_TYPE_LINES,
  VTK_GEOMETRY_SHADER_IN_TYPE_LINES_ADJACENCY,
  VTK_GEOMETRY_SHADER_IN_TYPE_TRIANGLES,
  VTK_GEOMETRY_SHADER_IN_TYPE_TRIANGLES_ADJACENCY
};

enum vtkShaderProgram2GeometryOutType
{
  VTK_GEOMETRY_SHADER_OUT_TYPE_POINTS,
  VTK_GEOMETRY_SHADER_OUT_TYPE_LINE_STRIP,
  VTK_GEOMETRY_SHADER_OUT_TYPE_TRIANGLE_STRIP
};

class VTKRENDERINGOPENGL_EXPORT vtkShaderProgram2 : public vtkObject
{
public:
  static vtkShaderProgram2* New();
  vtkTypeMacro(vtkShaderProgram2, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);

  static bool IsSupported(vtkRenderWindow *context);


  vtkGetMacro(PrintErrors,bool);
  vtkSetMacro(PrintErrors,bool);


  void SetContext(vtkRenderWindow *context);
  vtkRenderWindow *GetContext();


  vtkGetObjectMacro(Shaders,vtkShader2Collection);

  bool HasVertexShaders();

  bool HasTessellationControlShaders();

  bool HasTessellationEvaluationShaders();

  bool HasGeometryShaders();

  bool HasFragmentShaders();

  bool IsValid();

  void Build();

  void SendUniforms();


  void PrintActiveUniformVariables(ostream &os,
                                   vtkIndent indent);

  void PrintActiveUniformVariablesOnCout();

  bool IsUsed();

  void Use();

  void Restore();

  void RestoreFixedPipeline();


  void UseProgram();
  void UnuseProgram();

  int GetLastBuildStatus();

  const char *GetLastLinkLog();

  const char *GetLastValidateLog();

  virtual void ReleaseGraphicsResources();

  int GetAttributeLocation(const char *name);


  vtkGetObjectMacro(UniformVariables,vtkUniformVariables);
  virtual void SetUniformVariables(vtkUniformVariables *variables);

  bool DisplayListUnderCreationInCompileMode();


  vtkSetMacro(GeometryTypeIn,int);
  vtkGetMacro(GeometryTypeIn,int);


  vtkSetMacro(GeometryVerticesOut,int);
  vtkGetMacro(GeometryVerticesOut,int);


  vtkSetMacro(GeometryTypeOut,int);
  vtkGetMacro(GeometryTypeOut,int);

  /*
  Low level api --
  this is provided as a way to avoid some of the overhead in this
  class's implementation of SendUniforms. One should use the
  following API if performance is a concern (eg. uniforms are
  set per primative), or if the uniform management is not needed
  (eg. variables are already managed in other vtkObjects)
  */

  int GetUniformLocation(const char *name);


  void SetUniformf(const char *name, float val)
    { this->SetUniform1f(name, &val); }
  void SetUniform1f(const char *name, float *val)
    { this->SetUniform1f(this->GetUniformLocation(name), val); }
  void SetUniform2f(const char *name, float *val)
    { this->SetUniform2f(this->GetUniformLocation(name), val); }
  void SetUniform3f(const char *name, float *val)
    { this->SetUniform3f(this->GetUniformLocation(name), val); }
  void SetUniform4f(const char *name, float *val)
    { this->SetUniform4f(this->GetUniformLocation(name), val); }

  void SetUniformi(const char *name, int val)
    { this->SetUniform1i(name, &val); }
  void SetUniform1i(const char *name, int *val)
    { this->SetUniform1i(this->GetUniformLocation(name), val); }
  void SetUniform2i(const char *name, int *val)
    { this->SetUniform2i(this->GetUniformLocation(name), val); }
  void SetUniform3i(const char *name, int *val)
    { this->SetUniform3i(this->GetUniformLocation(name), val); }
  void SetUniform4i(const char *name, int *val)
    { this->SetUniform4i(this->GetUniformLocation(name), val); }

  void SetUniformf(int loc, float val)
    { this->SetUniform1f(loc, &val); }
  void SetUniform1f(int loc, float *val);
  void SetUniform2f(int loc, float *val);
  void SetUniform3f(int loc, float *val);
  void SetUniform4f(int loc, float *val);

  void SetUniformi(int loc, int val)
    { this->SetUniform1i(loc, &val); }
  void SetUniform1i(int loc, int *val);
  void SetUniform2i(int loc, int *val);
  void SetUniform3i(int loc, int *val);
  void SetUniform4i(int loc, int *val);


  template<typename T> void SetUniform1it(const char *name, T *value);
  template<typename T> void SetUniform2it(const char *name, T *value);
  template<typename T> void SetUniform3it(const char *name, T *value);
  template<typename T> void SetUniform4it(const char *name, T *value);

  template<typename T> void SetUniform1ft(const char *name, T *value);
  template<typename T> void SetUniform2ft(const char *name, T *value);
  template<typename T> void SetUniform3ft(const char *name, T *value);
  template<typename T> void SetUniform4ft(const char *name, T *value);

  template<typename T> void SetUniform1it(int loc, T *value);
  template<typename T> void SetUniform2it(int loc, T *value);
  template<typename T> void SetUniform3it(int loc, T *value);
  template<typename T> void SetUniform4it(int loc, T *value);

  template<typename T> void SetUniform1ft(int loc, T *value);
  template<typename T> void SetUniform2ft(int loc, T *value);
  template<typename T> void SetUniform3ft(int loc, T *value);
  template<typename T> void SetUniform4ft(int loc, T *value);

protected:
  vtkShaderProgram2();
  virtual ~vtkShaderProgram2();

  bool LoadRequiredExtensions(vtkRenderWindow *context);

  int GetUniformLocationInternal(const char *name);

  unsigned int Id; // actually GLuint. Initial value is 0.
  unsigned int SavedId;

  vtkTimeStamp LastLinkTime;
  vtkTimeStamp LastSendUniformsTime;

  vtkShader2Collection *Shaders;
  vtkUniformVariables *UniformVariables;

  int LastBuildStatus; // Initial value is VTK_SHADER_PROGRAM2_COMPILE_FAILED

  char *LastLinkLog; // Initial value is the empty string ""='\0'
  size_t LastLinkLogCapacity; // Initial value is 8.

  char *LastValidateLog; // Initial value is the empty string ""='\0'
  size_t LastValidateLogCapacity; // Initial value is 8.


  bool PrintErrors;

  vtkWeakPointer<vtkRenderWindow> Context;
  bool ExtensionsLoaded;

  int GeometryTypeIn;
  int GeometryTypeOut;
  int GeometryVerticesOut;

private:
  vtkShaderProgram2(const vtkShaderProgram2&); // Not implemented.
  void operator=(const vtkShaderProgram2&); // Not implemented.
};

// ----------------------------------------------------------------------------
//BTX
#define vtkShaderProgram2SetUniformCopyCastMacro(toLetter, toType, num) \
template<typename fromType> \
void vtkShaderProgram2::SetUniform##num##toLetter##t(const char *name, fromType *fvalues) \
{ \
  toType tvalues[num]; \
  for (int i=0; i<num; ++i) \
    { \
    tvalues[i] = static_cast<toType>(fvalues[i]); \
    } \
  this->SetUniform##num##toLetter(name, tvalues); \
} \
template<typename fromType> \
void vtkShaderProgram2::SetUniform##num##toLetter##t(int location, fromType *fvalues) \
{ \
  assert(location!=-1); \
  toType tvalues[num]; \
  for (int i=0; i<num; ++i) \
    { \
    tvalues[i] = static_cast<toType>(fvalues[i]); \
    } \
  this->SetUniform##num##toLetter(location, tvalues); \
}
vtkShaderProgram2SetUniformCopyCastMacro(f, float, 1)
vtkShaderProgram2SetUniformCopyCastMacro(f, float, 2)
vtkShaderProgram2SetUniformCopyCastMacro(f, float, 3)
vtkShaderProgram2SetUniformCopyCastMacro(f, float, 4)
vtkShaderProgram2SetUniformCopyCastMacro(i, int, 1)
vtkShaderProgram2SetUniformCopyCastMacro(i, int, 2)
vtkShaderProgram2SetUniformCopyCastMacro(i, int, 3)
vtkShaderProgram2SetUniformCopyCastMacro(i, int, 4)
//ETX


#endif