/*
 * Copyright 2010 Inalogic® Inc.
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License, as
 * published by the  Free Software Foundation; either version 2.1 or 3.0
 * of the License.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranties of
 * MERCHANTABILITY, SATISFACTORY QUALITY or FITNESS FOR A PARTICULAR
 * PURPOSE.  See the applicable version of the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of both the GNU Lesser General Public
 * License along with this program. If not, see <http://www.gnu.org/licenses/>
 *
 * Authored by: Jay Taoko <jaytaoko@inalogic.com>
 *
 */


#ifndef RENDERINGPIPE_H
#define RENDERINGPIPE_H

#include "GLResource.h"

namespace nux
{

  //! Graphics wraping modes
  /*!
      Defines the wraping modes of TexCoordXForm.
      The values are matched to OpenGL wraping modes.
      @sa TexCoordXForm.
  */
  typedef enum
  {
    TEXWRAP_UNKNOWN = 0,
    TEXWRAP_REPEAT,
    TEXWRAP_CLAMP,
    TEXWRAP_CLAMP_TO_EDGE,
    TEXWRAP_CLAMP_TO_BORDER,
    TEXWRAP_MIRRORED_REPEAT,
    TEXWRAP_MIRROR_CLAMP_EXT,
    TEXWRAP_MIRROR_CLAMP_TO_EDGE_EXT,
    TEXWRAP_MIRROR_CLAMP_TO_BORDER_EXT,
  } TexWrap;

  //! Graphics filtering modes
  /*!
      Defines the filtering modes of TexCoordXForm.
      The values are matched to openGL filtering modes.
      @sa TexCoordXForm.
  */
  typedef enum
  {
    TEXFILTER_UNKNOWN = 0,
    TEXFILTER_LINEAR,
    TEXFILTER_NEAREST,
    TEXFILTER_NEAREST_MIPMAP_NEAREST,
    TEXFILTER_LINEAR_MIPMAP_NEAREST,
    TEXFILTER_NEAREST_MIPMAP_LINEAR,
    TEXFILTER_LINEAR_MIPMAP_LINEAR,
  } TexFilter;

  //! Graphics blend modes
  /*!
      Defines the blending modes.
      The values are matched to openGL blending modes.
  */
  typedef enum
  {
    ROPBLEND_UNKNOWN = 0,
    ROPBLEND_ZERO,
    ROPBLEND_ONE,
    ROPBLEND_SRC_COLOR,
    ROPBLEND_ONE_MINUS_SRC_COLOR,
    ROPBLEND_DST_COLOR,
    ROPBLEND_ONE_MINUS_DST_COLOR,
    ROPBLEND_SRC_ALPHA,
    ROPBLEND_ONE_MINUS_SRC_ALPHA,
    ROPBLEND_DST_ALPHA,
    ROPBLEND_ONE_MINUS_DST_ALPHA,
    ROPBLEND_CONSTANT_COLOR,
    ROPBLEND_ONE_MINUS_CONSTANT_COLOR,
    ROPBLEND_CONSTANT_ALPHA,
    ROPBLEND_ONE_MINUS_CONSTANT_ALPHA,
    ROPBLEND_SRC_ALPHA_SATURATE,
  } RopBlend;

  //! Texture parameter and coordinate computation class.
  /*!
      Defines the texture coordinate computation, wrapping and filtering modes 
   */
  class TexCoordXForm
  {
  public:
    //! Texture coordinates computation mode
    typedef enum
    {
      OFFSET_SCALE_COORD, //!< Texture coordinates are scaled and offset.
      OFFSET_COORD,       //!< Textures coordinates are offset. The scaling factor between the texture size and the quad size is preserved.
      NORMALIZED_COORD,   //!< Provided normalized texture coordinates in u0, v0, u1, v1
      UNNORMALIZED_COORD, //!< Provided un-normalized texture coordinates in u0, v0, u1, v1
      FIXED_COORD,        //!< Provided fix coordinates in u0, v0, u1, v1
    } TexCoordType;

    TexCoordXForm();

    void SetTexCoordType(TexCoordType tex_coord_type);
    void FlipUCoord(bool b);
    void FlipVCoord(bool b);
    void FlipUVCoord(bool flip_u, bool flip_v);
    void SetFilter(TexFilter min_fliter, TexFilter mag_filter);
    void SetWrap(TexWrap u_wrap, TexWrap v_wrap);

    //! Texture coordinates are computed automatically by following the TexCoordType policy or provided by the user
    float u0, v0, u1, v1;
    float uscale;
    float vscale;
    float uoffset;
    float voffset;
    TexWrap uwrap;
    TexWrap vwrap;
    TexFilter min_filter;
    TexFilter mag_filter;
    bool flip_u_coord;
    bool flip_v_coord;
    TexCoordType m_tex_coord_type;
  };

//! Compute texture coordinates and wrapping mode according to TexCoordXForm
  /*!
      @param quad_width   Quad width.
      @param quad_height  Quad height.
      @param tex          Device texture.
      @param texxform     Texture coordinates computation mode.
  */
  void QRP_Compute_Texture_Coord(int quad_width, int quad_height, ObjectPtr<IOpenGLBaseTexture> tex, TexCoordXForm &texxform);

}

#endif // RENDERINGPIPE_H