cpp-game-engine/engine/test/mock_renderer.h

//
//  mock_renderer.h
//  engine
//
//  Created by Sam Jaffe on 6/2/19.
//  Copyright © 2019 Sam Jaffe. All rights reserved.
//

#pragma once

#include <game/graphics/manager.hpp>
#include <game/graphics/renderer.hpp>
#include <game/graphics/shader.hpp>
#include <game/graphics/shader_program.hpp>
#include <game/graphics/texture.hpp>
#include <game/util/identity.hpp>

template <typename T> inline identity<T> cast(unsigned int id) {
  return *reinterpret_cast<identity<T> *>(&id);
}

struct stub_manager_impl : graphics::manager {
  using shader = graphics::shader;
  using shader_program = graphics::shader_program;
  using texture = graphics::texture;

  shader compile(graphics::shaders::type t,
                 std::string const & s) const override {
    return {0, t, s};
  }
  shader_program compile(identity<shader> f,
                         identity<shader> v) const override {
    return {0, f, v};
  }
  texture compile(graphics::textures::format, math::vec2i dims,
                  void const *) const override {
    return {0, dims};
  }
};

class stub_renderer : public graphics::renderer {
public:
  std::shared_ptr<graphics::manager const> manager() const override {
    return manager_;
  }
  void draw(graphics::object const &) override {}
  void draw(identity<graphics::material>, math::matr4 const &,
            std::vector<graphics::vertex> const &) override{};
  void clear() override {}
  void flush() override {}

private:
  std::shared_ptr<graphics::manager const> manager_{new stub_manager_impl};
};