// Filename: dxShaderContext9.h
// Created by: aignacio (Jan06)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001 - 2006, Disney Enterprises, Inc.  All rights reserved
//
// All use of this software is subject to the terms of the Panda 3d
// Software license.  You should have received a copy of this license
// along with this source code; you will also find a current copy of
// the license at http://etc.cmu.edu/panda3d/docs/license/ .
//
// To contact the maintainers of this program write to
// panda3d-general@lists.sourceforge.net .
//
////////////////////////////////////////////////////////////////////

#ifndef DXSHADERCONTEXT9_H
#define DXSHADERCONTEXT9_H

#include "dtool_config.h"
#include "pandabase.h"
#include "string_utils.h"
#include "internalName.h"
#include "shader.h"
#include "shaderContext.h"


#define CLP(name) DX##name##9
#define CLASSPREFIX_QUOTED "DX"


class VertexElementArray;
class CLP(GraphicsStateGuardian);

// Caution: adding HLSL support is going to be tricky, as the parsing needs
// to be done in the cull thread, which cannot use the DX API.  - Josh
//
//
// typedef struct
// {
//   int vertex_shader;
//   int total_constant_descriptions;
//   D3DXCONSTANT_DESC *constant_description_array;
// }
// DX_PARAMETER;
// 
// typedef struct
// {
//   int state;
//   union
//   {
//     DIRECT_3D_VERTEX_SHADER direct_3d_vertex_shader;
//     DIRECT_3D_PIXEL_SHADER direct_3d_pixel_shader;
//   };
//   LPD3DXCONSTANTTABLE constant_table;
//   D3DXCONSTANTTABLE_DESC constant_table_description;
// 
//   int total_semantics;
//   D3DXSEMANTIC *semantic_array;
// }
// DIRECT_3D_SHADER;

////////////////////////////////////////////////////////////////////
//       Class : DXShaderContext9
// Description : xyz
////////////////////////////////////////////////////////////////////

class EXPCL_PANDADX CLP(ShaderContext): public ShaderContext {
public:
  typedef CLP(GraphicsStateGuardian) GSG;
  
  CLP(ShaderContext)(Shader *s, GSG *gsg);
  ~CLP(ShaderContext)();

  INLINE bool valid(GSG *gsg);
  bool bind(GSG *gsg);
  void unbind(GSG *gsg);
  void issue_parameters(GSG *gsg, int altered);
  void issue_transform(GSG *gsg);
  void disable_shader_vertex_arrays(GSG *gsg);
  void update_shader_vertex_arrays(CLP(ShaderContext) *prev, GSG *gsg);
  void disable_shader_texture_bindings(GSG *gsg);
  void update_shader_texture_bindings(CLP(ShaderContext) *prev, GSG *gsg);

  class VertexElementArray *_vertex_element_array;

  // FOR DEBUGGING
  int _vertex_size;
  string _name;
  
private:

#ifdef HAVE_CG
  CGcontext _cg_context;
  CGprogram _cg_vprogram;
  CGprogram _cg_fprogram;
  pvector <CGparameter> _cg_parameter_map;
#endif

private:

  void release_resources(void);

public:
  static TypeHandle get_class_type() {
    return _type_handle;
  }
  static void init_type() {
    TypedObject::init_type();
    register_type(_type_handle, CLASSPREFIX_QUOTED "ShaderContext",
                  TypedObject::get_class_type());
  }
  virtual TypeHandle get_type() const {
    return get_class_type();
  }
  virtual TypeHandle force_init_type() {init_type(); return get_class_type();}

private:
  static TypeHandle _type_handle;
};

#include "dxShaderContext9.I"

#endif
