#ifndef SHADER_VARS_H
#define SHADER_VARS_H

#include "shader.h"

namespace shader {

  extern struct vin
  {
    // for setting
    static varying_3f vertex_3f;
    static varying_4f vertex_4f;
    static varying_3f normal_3f;
    static varying_3f color_3f;
    static varying_4f color_4f;
    static varying_3f secondary_color_3f;
    static varying_4f secondary_color_4f;
    static varying_1f tex_coord_1f[8];
    static varying_2f tex_coord_2f[8];
    static varying_3f tex_coord_3f[8];
    static varying_4f tex_coord_4f[8];

    // for the vertex shader
    static const gluvar vertex;
    static const gluvar normal;
    static const gluvar color;
    static const gluvar secondary_color;
    static const gluvar tex_coord[8];
    static const gluvar fog_coord;
  } vin;

  extern struct vout
  {
    // glstate builtin
    static const gluvar position;
    static const gluvar point_size;
    static const gluvar clip_vertex;

    // standard varying
    static const gluvar front_color;
    static const gluvar back_color;
    static const gluvar front_secondary_color;
    static const gluvar back_secondary_color;
    static const gluvar tex_coord[8];
    static const gluvar fog_frag_coord;
  } vout;

  extern struct fin
  {
    // glstate builtin
    static const gluvar frag_coord;
    static const gluvar front_facing;

    // standard varying
    static const gluvar color;
    static const gluvar secondary_color;
    static const gluvar tex_coord[8];
    static const gluvar fog_frag_coord;
  } fin;

  extern struct fout
  {
    // glstate builtin
    static const gluvar frag_color;
    static const gluvar frag_depth;
    static const gluvar frag_data[2];
  } fout;

  // predefined globals
  extern struct gl {
    static gluvar model_view_matrix,
                  projection_matrix,
                  model_view_projection_matrix,
                  texture_matrix[8];
    static gluvar model_view_matrix_inverse,
                  projection_matrix_inverse,
                  model_view_projection_matrix_inverse,
                  texture_matrix_inverse[8];
    static gluvar model_view_matrix_transpose,
                  projection_matrix_transpose,
                  model_view_projection_matrix_transpose,
                  texture_matrix_transpose[8];
    static gluvar model_view_matrix_inverse_transpose,
                  projection_matrix_inverse_transpose,
                  model_view_projection_matrix_inverse_transpose,
                  texture_matrix_inverse_transpose[8];

    static gluvar normal_matrix;

    static gluvar normal_scale;
    static gluvar depth_range_near, depth_range_far, depth_range_diff;

    static gluvar clip_plane[2];//TODO

    // point parameters TODO

    static gluvar front_material_emission,
                  front_material_ambient,
                  front_material_diffuse,
                  front_material_specular,
                  front_material_shininess;
    static gluvar back_material_emission,
                  back_material_ambient,
                  back_material_diffuse,
                  back_material_specular,
                  back_material_shininess;

    // light source parameters TODO
    
    static gluvar light_model_ambient;
    static gluvar front_light_model_product_scene_color;
    static gluvar back_light_model_product_scene_color;

    // light products TODO
    // texture env and gen TODO
    // fogparameters TODO
    
    // shader output are in vout and fout
  } gl;

}

#endif