game: map units combat and SDL2 render slice

src/main.c

@@ -0,0 +1,44 @@
+#include "ok_game.h"
+#include "ok_render.h"
+#include <stdio.h>
+#include <SDL.h>
+
+#ifndef OPENKKND_VERSION
+#define OPENKKND_VERSION "dev"
+#endif
+
+int main(int argc, char **argv) {
+  (void)argc;
+  (void)argv;
+  printf("OpenKKND %s — original genre RTS (MIT). No commercial IP assets.\n", OPENKKND_VERSION);
+
+  const int tw = 12;
+  if (!ok_render_init(OK_MAP_W * tw, OK_MAP_H * tw)) {
+    fprintf(stderr, "render init failed\n");
+    return 1;
+  }
+
+  OkGame game;
+  ok_game_init(&game);
+
+  Uint64 prev = SDL_GetPerformanceCounter();
+  const Uint64 freq = SDL_GetPerformanceFrequency();
+
+  while (game.running || true) {
+    SDL_Event e;
+    while (SDL_PollEvent(&e)) {
+      if (e.type == SDL_QUIT) goto done;
+      if (e.type == SDL_KEYDOWN && e.key.keysym.sym == SDLK_ESCAPE) goto done;
+      if (e.type == SDL_KEYDOWN && e.key.keysym.sym == SDLK_r) ok_game_init(&game);
+    }
+    Uint64 now = SDL_GetPerformanceCounter();
+    float dt = (float)(now - prev) / (float)freq;
+    prev = now;
+    if (dt > 0.05f) dt = 0.05f;
+    if (game.running) ok_game_update(&game, dt);
+    ok_render_draw(&game);
+  }
+done:
+  ok_render_shutdown();
+  return 0;
+}