Very basic ECS

1 files changed, 97 insertions, 0 deletions

@@ -0,0 +1,97 @@
+#include "renderer.h"
+#include "simulation.h"
+#include "consts.h"
+#include "level.h"
+
+Renderer::Renderer()
+{
+  win_ = window_ptr(
+    SDL_CreateWindow(
+      "dispatcher",
+      100,
+      100,
+      WINDOW_SIZE.w(),
+      WINDOW_SIZE.h(),
+      SDL_WINDOW_SHOWN));
+
+  if (!win_)
+  {
+    throw sdl_error();
+  }
+
+  ren_ = renderer_ptr(
+    SDL_CreateRenderer(
+      win_.get(),
+      -1,
+      SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC));
+
+  if (!ren_)
+  {
+    throw sdl_error();
+  }
+
+  SDL_SetRenderDrawBlendMode(ren_.get(), SDL_BLENDMODE_MOD);
+  SDL_SetRenderDrawColor(ren_.get(), 255, 150, 255, 255);
+  SDL_RenderFillRect(ren_.get(), nullptr);
+}
+
+void Renderer::render(const Simulation& sim)
+{
+  texture_ptr canvas(
+    SDL_CreateTexture(
+      ren_.get(),
+      SDL_PIXELFORMAT_RGBA8888,
+      SDL_TEXTUREACCESS_TARGET,
+      WINDOW_SIZE.w(),
+      WINDOW_SIZE.h()));
+
+  if (!canvas)
+  {
+    throw sdl_error();
+  }
+
+  SDL_SetRenderTarget(ren_.get(), nullptr);
+  SDL_SetRenderDrawBlendMode(ren_.get(), SDL_BLENDMODE_NONE);
+  SDL_SetRenderDrawColor(ren_.get(), 255, 150, rand() % 255, 255);
+  SDL_RenderClear(ren_.get());
+
+  const Level& level = sim.getLevel();
+
+  for (size_t y = 0; y < level.getSize().h(); y++)
+  {
+    for (size_t x = 0; x < level.getSize().w(); x++)
+    {
+      int val = level.at(x, y) * 10;
+
+      SDL_SetRenderDrawColor(ren_.get(), val, val, 0, 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_.get(), &rect);
+    }
+  }
+
+  for (Simulation::id_type id : sim.getActive())
+  {
+    const Entity& entity = sim.getEntity(id);
+
+    SDL_SetRenderDrawColor(ren_.get(), 100, 100, 100, 255);
+
+    SDL_Rect rect {
+      static_cast<int>(entity.pos.x()),
+      static_cast<int>(entity.pos.y()),
+      static_cast<int>(entity.size.w()),
+      static_cast<int>(entity.size.h())
+    };
+
+    SDL_RenderFillRect(ren_.get(), &rect);
+  }
+
+  //SDL_RenderCopy(ren_.get(), canvas.get(), nullptr, nullptr);
+  SDL_RenderPresent(ren_.get());
+}