/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file vertexElementArray.h
 * @author aignacio
 * @date 2006-01
 */

#ifndef VERTEX_ELEMENT_ARRAY_H
#define VERTEX_ELEMENT_ARRAY_H

/**
 * This class gives the ability for a user-friendly way of creating a vertex
 * declaration for DirectX 9. Since a vertex shader has a fixed input, the
 * vertex element array can be cached so that a new vertex declaration for
 * different vertex buffers can be quickly created.  Be sure to call
 * add_end_vertex_element ( ) when finished creating a vertex element array.
 * VERTEX_ELEMENT_TYPE is used for a simplified mapping of vertex buffer data
 * to vertex shader inputs.  This class is used with DXShaderContext9 and in
 * conjunction with DXVertexBufferContext9.
 */
class VertexElementArray
{
public:

  VertexElementArray (int maximum_vertex_elements);
  ~VertexElementArray ( );

  void add_position_xyz_vertex_element (int stream_index, int offset);
  void add_position_xyzw_vertex_element (int stream_index, int offset);

  void add_normal_vertex_element (int stream_index, int offset);
  void add_binormal_vertex_element (int stream_index, int offset);
  void add_tangent_vertex_element (int stream_index, int offset);

  void add_diffuse_color_vertex_element (int stream_index, int offset);
  void add_specular_color_vertex_element (int stream_index, int offset);

  void add_u_vertex_element (int stream_index, int offset, int texture_stage);
  void add_uv_vertex_element (int stream_index, int offset, int texture_stage);
  void add_uvw_vertex_element (int stream_index, int offset, int texture_stage);
  void add_xyzw_vertex_element (int stream_index, int offset, int texture_stage);

  bool add_end_vertex_element (void);

  int _total_elements;
  int _maximum_vertex_elements;

  LPD3DVERTEXELEMENT9 _vertex_element_array;
};

#endif