Add flecs ECS

working copy

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.24)
+
+project(HansTheGatherer)
+
+# Option to switch real platform vs. SDL implementation...
+
+find_package(SDL3 REQUIRED)
+find_package(flecs REQUIRED)
+find_package(spdlog REQUIRED)
+
+add_executable(HansTheGatherer main.cpp)
+
+target_link_libraries(HansTheGatherer SDL3::SDL3 flecs::flecs spdlog::spdlog)
+
+set_property(TARGET HansTheGatherer PROPERTY CXX_STANDARD 20)

LICENSE

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+BSD 3-Clause License
+
+Copyright (c) 2025, Derek Christ
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

main.cpp

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+#include <SDL3/SDL.h>
+#include <SDL3/SDL_error.h>
+#include <SDL3/SDL_render.h>
+#include <flecs.h>
+#include <spdlog/spdlog.h>
+
+const uint8_t image_data[] = {
+#embed "main.cpp"
+};
+
+auto main() -> int {
+  spdlog::info("Initialize SDL...");
+  bool sdl_success = SDL_Init(SDL_INIT_VIDEO);
+  if (!sdl_success) {
+    spdlog::critical("Failed to initialize SDL!\nCause: {}", SDL_GetError());
+    std::terminate();
+  }
+
+  auto *sdl_window = SDL_CreateWindow("HansTheGatherer", 400, 280, 0);
+  if (sdl_window == nullptr) {
+    spdlog::critical("Failed to create SDL window!\nCause: {}", SDL_GetError());
+  }
+
+  auto *sdl_renderer = SDL_CreateRenderer(sdl_window, nullptr);
+  if (sdl_renderer == nullptr) {
+    spdlog::critical("Failed to create SDL renderer!\nCause: {}",
+                     SDL_GetError());
+  }
+
+  flecs::world world;
+
+  bool exit_gameloop = false;
+  while (!exit_gameloop) {
+    SDL_Event event;
+    while (SDL_PollEvent(&event)) {
+      switch (event.type) {
+      case SDL_EVENT_QUIT:
+        exit_gameloop = true;
+        break;
+      case SDL_EVENT_KEY_DOWN:
+        if (event.key.key == SDLK_ESCAPE) {
+          exit_gameloop = true;
+        }
+        break;
+      }
+    }
+  }
+
+  SDL_DestroyRenderer(sdl_renderer);
+  SDL_DestroyWindow(sdl_window);
+  SDL_Quit();
+
+  return 0;
+}

vcpkg.json

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+{
+  "dependencies": [
+    "spdlog",
+    "sdl3",
+    "spdlog",
+    "flecs"
+  ]
+}