//
//  helper.hpp
//  graphics
//
//  Created by Sam Jaffe on 5/18/19.
//  Copyright © 2019 Sam Jaffe. All rights reserved.
//

#pragma once

#include <string>
#include <utility>

#include "game/graphics/graphics_fwd.h"
#include "game/math/math_fwd.hpp"

namespace graphics {
  struct uniform;
  namespace textures {
    enum class format { RGB, RGBA };
    unsigned int init(format, math::vec2i, void const *);
  }
  namespace shaders {
    enum class type : unsigned int { FRAGMENT, VERTEX };
    unsigned int init(type, std::string const &);
    unsigned int init(identity<shader> const & fragmentShader,
                      identity<shader> const & vertexShader);
    void activate(identity<shader_program> id);
    int uniform_location(identity<shader_program> id,
                         std::string const & uniform);
  }
  namespace materials {
    enum class uniform : unsigned int { NORMAL, DIFFUSE, SPECULAR };
    void activate(identity<shader_program> program,
                  std::vector<graphics::uniform> const & uniforms);
  }
}

namespace std {
  template <> struct hash<graphics::shaders::type> {
    std::size_t operator()(graphics::shaders::type tp) const {
      return std::hash<unsigned int>()(static_cast<unsigned int>(tp));
    }
  };

  template <> struct hash<graphics::materials::uniform> {
    std::size_t operator()(graphics::materials::uniform uf) const {
      return std::hash<unsigned int>()(static_cast<unsigned int>(uf));
    }
  };
}