79 lines
1.9 KiB
C++
79 lines
1.9 KiB
C++
#include <cstdlib>
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#include <dlfcn.h>
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#include <sys/stat.h>
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#include <cstdio>
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struct GameState;
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struct GameApi {
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struct GameState *(*init)();
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void (*step) (GameState *state);
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void (*finalize) (GameState *state);
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void (*reload) (GameState *state);
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void (*unload) (GameState *state);
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bool (*window_should_close)();
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};
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struct Game {
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time_t last_write_time;
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void *gamelib_handle;
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ino_t gamelib_id;
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GameApi api;
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GameState *state;
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};
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time_t get_file_write_time(const char* path) {
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struct stat file_stat;
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if (stat(path, &file_stat) == 0) {
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return file_stat.st_mtime;
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}
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return 0;
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}
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bool load_game_api(Game* game) {
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const char* lib_path = "./game.so";
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time_t write_time = get_file_write_time(lib_path);
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if (write_time <= game->last_write_time) {
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return false;
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}
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if (game->gamelib_handle) {
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dlclose(game->gamelib_handle);
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}
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game->gamelib_handle = dlopen(lib_path, RTLD_NOW);
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if (!game->gamelib_handle) {
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printf("Failed to load game.so: %s\n", dlerror());
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return false;
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}
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game->api.init = (GameState*(*)())dlsym(game->gamelib_handle, "game_init");
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game->api.step = (void(*)(GameState*))dlsym(game->gamelib_handle, "game_step");
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game->api.finalize = (void(*)(GameState*))dlsym(game->gamelib_handle, "game_cleanup");
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game->api.window_should_close = (bool(*)())dlsym(game->gamelib_handle, "window_should_close");
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game->last_write_time = write_time;
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printf("Reloaded game.so\n");
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return true;
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}
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int main(void) {
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Game game;
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load_game_api(&game);
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game.state = game.api.init();
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while (!game.api.window_should_close()) {
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// game.frame_count++;
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// float dt = GetFrameTime();
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load_game_api(&game);
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game.api.step(game.state);
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}
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game.api.finalize(game.state);
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return 0;
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}
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