This cleans up how I'm rendering the map but there's no way I can render a large map like this. It'd be way too big.

tests/map.cpp

@@ -80,71 +80,71 @@ TEST_CASE("dijkstra algo test", "[map]") {
   }
 }
 
-sf::Sprite render_sprite(std::unordered_map<wchar_t, sf::Vector2i>& sprite_coord, sf::Vector2i size, wchar_t display, sf::Texture& map_sprites) {
-  auto coords = sprite_coord.at(display);
-  sf::IntRect square{coords, {size.x, size.y}};
-  sf::Sprite sprite{map_sprites, square};
-  return sprite;
-}
-
-
-TEST_CASE("map image test", "[map-sprite]") {
-  components::init();
-  textures::init();
-  LevelManager levels;
-  GameLevel level = levels.current();
+sf::Sprite render_map(GameLevel& level, sf::RenderTexture& render) {
   auto &walls = level.map->tiles();
+
   auto &tile_set = textures::get_map_tile_set();
 
   sf::Vector2i size{MAP_TILE_DIM,MAP_TILE_DIM};
-  matrix::dump("TILES?", walls);
-
-  std::unordered_map<wchar_t, sf::Vector2i> sprite_coord;
-
-  Config config("./assets/map_tiles.json");
-  json& tiles = config.json();
-
-  for(auto tile : tiles) {
-    sf::Vector2i coords{tile["x"], tile["y"]};
-    REQUIRE(coords.x % size.x == 0);
-    REQUIRE(coords.y % size.y == 0);
-    sprite_coord.insert_or_assign(tile["display"], coords);
-  }
 
   sf::Vector2u dim{
     (unsigned int)matrix::width(walls) * size.x,
     (unsigned int)matrix::height(walls) * size.y};
 
-  sf::RenderTexture render{dim};
-  render.clear({0,0,0,0});
+  bool worked = render.resize(dim);
+  dbc::check(worked, "Failed to resize map render target.");
 
-  sf::Texture map_sprites{"./assets/map_tiles.png"};
-  sf::Texture paper{"./assets/ui/full_screen_paper.png"};
-  sf::Sprite paper_sprite{paper};
-  paper_sprite.scale({1.5f, 1.5f});
-  paper_sprite.setPosition({-30.0f, -30.0f});
-  render.draw(paper_sprite);
+  render.clear({0,0,0,0});
 
   for(matrix::each_row it{walls}; it.next();) {
     size_t tid = walls[it.y][it.x];
     wchar_t display = tile_set[tid];
-    REQUIRE(sprite_coord.contains(display));
 
-    auto sprite = render_sprite(sprite_coord, size, display, map_sprites);
+    auto& sprite = textures::get_map_sprite(display);
     sprite.setPosition({float(it.x * size.x), float(it.y * size.y)});
     render.draw(sprite);
   }
 
-  level.world->query<components::Position, components::Tile>([&](auto, auto &pos, auto &entity_glyph) {
-    REQUIRE(sprite_coord.contains(entity_glyph.display));
+  render.display();
+  return sf::Sprite{render.getTexture()};
+}
+
+sf::Sprite render_entities(GameLevel& level, sf::Sprite& map_sprite, sf::RenderTexture& render) {
+  render.clear({0,0,0,0});
+  render.draw(map_sprite);
 
-    auto sprite = render_sprite(sprite_coord, size, entity_glyph.display, map_sprites);
-    sprite.setPosition({float(pos.location.x * size.x), float(pos.location.y * size.y)});
+  level.world->query<components::Position, components::Tile>([&](auto, auto &pos, auto &entity_glyph) {
+    auto sprite = textures::get_map_sprite(entity_glyph.display);
+    sprite.setPosition({float(pos.location.x * MAP_TILE_DIM), float(pos.location.y * MAP_TILE_DIM)});
     render.draw(sprite);
   });
 
   render.display();
-  sf::Image out_img = render.getTexture().copyToImage();
-  bool worked = out_img.saveToFile("map_test.png");
+  return sf::Sprite{render.getTexture()};
+}
+
+TEST_CASE("map image test", "[map-sprite]") {
+  components::init();
+  textures::init();
+
+  LevelManager levels;
+  GameLevel level = levels.current();
+  // on level start make one render texture with the base map
+  auto render = std::make_shared<sf::RenderTexture>();
+  auto map_sprite = render_map(level, *render);
+
+  // every turn render the map to the entities texture, then render
+  // entities on this image, that way I just have to render them
+  auto entities = std::make_shared<sf::RenderTexture>(render->getSize());
+  render_entities(level, map_sprite, *entities);
+
+  // confirm we get two different maps
+  auto out_img = render->getTexture().copyToImage();
+  bool worked = out_img.saveToFile("map_render.png");
+  REQUIRE(worked);
+
+  // this has entities on it
+  out_img = entities->getTexture().copyToImage();
+  worked = out_img.saveToFile("map_entities.png");
   REQUIRE(worked);
 }

textures.cpp

@@ -78,10 +78,31 @@ namespace textures {
     }
   }
 
+  void load_map_tiles() {
+    Config config("./assets/map_tiles.json");
+    nlohmann::json& tiles = config.json();
+
+    for(auto tile : tiles) {
+      sf::Vector2i coords{tile["x"], tile["y"]};
+      dbc::check(coords.x % ICONGEN_MAP_TILE_DIM == 0, "x coordinates wrong in map");
+      dbc::check(coords.y % ICONGEN_MAP_TILE_DIM == 0, "y coordinates wrong in map");
+
+      sf::IntRect square{coords, {ICONGEN_MAP_TILE_DIM, ICONGEN_MAP_TILE_DIM}};
+      sf::Sprite sprite{TMGR.map_sprite_sheet, square};
+      wchar_t display = tile["display"];
+
+      dbc::check(!TMGR.map_sprites.contains(display),
+          fmt::format("duplicate tile display {} in map_tiles.json", int(display)));
+
+      TMGR.map_sprites.try_emplace(display, sprite);
+    }
+  }
+
   void init() {
     if(!initialized) {
       load_tiles();
       load_sprites();
+      load_map_tiles();
       initialized = true;
     }
   }
@@ -134,4 +155,11 @@ namespace textures {
         fmt::format("there is no texture named {} in tiles.json", name));
     return TMGR.name_to_id.at(name);
   }
+
+  sf::Sprite& get_map_sprite(wchar_t display) {
+    dbc::check(TMGR.map_sprites.contains(display),
+        fmt::format("map_sprites.json doesn't have {} sprite", int(display)));
+
+    return TMGR.map_sprites.at(display);
+  }
 };

textures.hpp

@@ -22,6 +22,8 @@ namespace textures {
     std::vector<int> ambient_light;
     std::unordered_map<std::string, SpriteTexture> sprite_textures;
     std::unordered_map<std::string, size_t> name_to_id;
+    std::unordered_map<wchar_t, sf::Sprite> map_sprites;
+    sf::Texture map_sprite_sheet{"./assets/map_tiles.png"};
   };
 
   void init();
@@ -40,5 +42,7 @@ namespace textures {
 
   const uint32_t* get_ceiling(size_t num);
 
+  sf::Sprite& get_map_sprite(wchar_t display);
+
   size_t get_id(const std::string& name);
 }