#ifndef SHADER_VARS_H
#define SHADER_VARS_H

#include "shader.h"

namespace shader {
  namespace compile {
    extern struct vin
    {
      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 gluvar model_view_matrix,
                  projection_matrix,
                  model_view_projection_matrix,
                  texture_matrix[8];
    extern gluvar model_view_matrix_inverse,
                  projection_matrix_inverse,
                  model_view_projection_matrix_inverse,
                  texture_matrix_inverse[8];
    extern gluvar model_view_matrix_transpose,
                  projection_matrix_transpose,
                  model_view_projection_matrix_transpose,
                  texture_matrix_transpose[8];
    extern gluvar model_view_matrix_inverse_transpose,
                  projection_matrix_inverse_transpose,
                  model_view_projection_matrix_inverse_transpose,
                  texture_matrix_inverse_transpose[8];

    extern gluvar normal_matrix;

    extern gluvar normal_scale;
    extern gluvar depth_range_near, depth_range_far, depth_range_diff;

    extern gluvar clip_plane[2];//TODO

    // point parameters TODO

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

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

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

#endif