5 files changed, 50 insertions, 16 deletions

@@ -9,6 +9,7 @@ enum class ColliderType {
 };
 
 enum class Layer {
+  map,
   track,
   object
 };
@@ -0,0 +1,40 @@
+#include "level.h"
+
+texture_ptr Level::render(SDL_Renderer* ren, Layer layer) const
+{
+  texture_ptr canvas(
+    SDL_CreateTexture(
+      ren,
+      SDL_PIXELFORMAT_RGBA8888,
+      SDL_TEXTUREACCESS_TARGET,
+      WINDOW_SIZE.w(),
+      WINDOW_SIZE.h()));
+
+  SDL_SetRenderTarget(ren, canvas.get());
+
+  for (size_t y = 0; y < size_.h(); y++)
+  {
+    for (size_t x = 0; x < size_.w(); x++)
+    {
+      if (layer == Layer::map)
+      {
+        int val = 255 - at(x, y) * 10;
+
+        SDL_SetRenderDrawColor(ren, val, val, val, 255);
+
+        SDL_Rect rect {
+          static_cast<int>(x * TILE_SIZE.w()),
+          static_cast<int>(y * TILE_SIZE.h()),
+          TILE_SIZE.w(),
+          TILE_SIZE.h()
+        };
+
+        SDL_RenderFillRect(ren, &rect);
+      }
+    }
+  }
+
+  SDL_SetRenderTarget(ren, nullptr);
+
+  return canvas;
+}
@@ -2,6 +2,7 @@
 #define LEVEL_H_678CFCCF
 
 #include <vector>
+#include "renderer.h"
 #include "vector.h"
 #include "consts.h"
 #include "tileset.h"
@@ -36,6 +37,8 @@ public:
     return tileset_;
   }
 
+  texture_ptr render(SDL_Renderer* ren, Layer layer) const;
+
 private:
 
   vec2s size_;
@@ -235,25 +235,13 @@ void Simulation::tick(
 
 void Simulation::render(SDL_Renderer* ren)
 {
-  for (size_t y = 0; y < level_.getSize().h(); y++)
+  if (!renderedMap_)
   {
-    for (size_t x = 0; x < level_.getSize().w(); x++)
-    {
-      int val = 255 - level_.at(x, y) * 10;
-
-      SDL_SetRenderDrawColor(ren, val, val, val, 255);
-
-      SDL_Rect rect {
-        static_cast<int>(x * TILE_SIZE.w()),
-        static_cast<int>(y * TILE_SIZE.h()),
-        TILE_SIZE.w(),
-        TILE_SIZE.h()
-      };
-
-      SDL_RenderFillRect(ren, &rect);
-    }
+    renderedMap_ = level_.render(ren, Layer::map);
   }
 
+  SDL_RenderCopy(ren, renderedMap_.get(), nullptr, nullptr);
+
   constexpr Layer renderOrder[] = { Layer::track, Layer::object };
 
   ranges::for_each(
@@ -87,6 +87,8 @@ private:
   std::vector<Entity> entities_;
   std::deque<id_type> available_;
   std::set<id_type> active_;
+
+  texture_ptr renderedMap_;
 };
 
 #endif /* end of include guard: SIMULATION_H_7BF6EEA4 */