eco2d/code/games/sandbox/src/main.c

#define ZPL_IMPL
#include "zpl.h"
#include "platform/system.h"
#include "core/game.h"
#include "ents/entity.h"
#include "world/entity_view.h"
#include "utils/options.h"
#include "platform/signal_handling.h"
#include "platform/profiler.h"

#include "flecs/flecs.h"
#include "flecs/flecs_os_api_stdcpp.h"

#include "ecs/components.h"
#include "ecs/systems.h"

#if defined(PLATFORM_WEB)
    #include <emscripten/emscripten.h>
    void UpdateDrawFrame(void);
#endif

#define DEFAULT_WORLD_SEED 302097
#define DEFAULT_CHUNK_SIZE 16 /* amount of blocks within a chunk (single axis) */
#define DEFAULT_WORLD_SIZE 32 /* amount of chunks within a world (single axis) */

int main(int argc, char** argv) {
    zpl_opts opts={0};
    zpl_opts_init(&opts, zpl_heap(), argv[0]);

    zpl_opts_add(&opts, "?", "help", "the HELP section", ZPL_OPTS_FLAG);
    zpl_opts_add(&opts, "v", "viewer-only", "run viewer-only client", ZPL_OPTS_FLAG);
    zpl_opts_add(&opts, "d", "server-only", "run dedicated server", ZPL_OPTS_FLAG);
    zpl_opts_add(&opts, "c", "viewer-count", "number of viewers (detachable clients)", ZPL_OPTS_INT);
    zpl_opts_add(&opts, "p", "preview-map", "draw world preview", ZPL_OPTS_FLAG);
    zpl_opts_add(&opts, "ed", "enable-dash", "enables flecs dash", ZPL_OPTS_FLAG);
    zpl_opts_add(&opts, "s", "seed", "world seed", ZPL_OPTS_INT);
    zpl_opts_add(&opts, "r", "random-seed", "generate random world seed", ZPL_OPTS_FLAG);
    //zpl_opts_add(&opts, "cs", "chunk-size", "amount of blocks within a chunk (single axis)", ZPL_OPTS_INT);
    zpl_opts_add(&opts, "ws", "world-size", "amount of chunks within a world (single axis)", ZPL_OPTS_INT);
    zpl_opts_add(&opts, "ip", "host", "host IP address", ZPL_OPTS_STRING);
    zpl_opts_add(&opts, "port", "port", "port number", ZPL_OPTS_INT);

    uint32_t ok = zpl_opts_compile(&opts, argc, argv);

    if (!ok) {
        zpl_opts_print_errors(&opts);
        zpl_opts_print_help(&opts);
        return -1;
    }

    int8_t is_viewer_only = zpl_opts_has_arg(&opts, "viewer-only");
    int8_t is_server_only = zpl_opts_has_arg(&opts, "server-only");
    int8_t is_dash_enabled = zpl_opts_has_arg(&opts, "enable-dash");
    int32_t seed = (int32_t)zpl_opts_integer(&opts, "seed", DEFAULT_WORLD_SEED);
    uint16_t num_viewers = (uint16_t)zpl_opts_integer(&opts, "viewer-count", 1);
    uint16_t world_size = (uint16_t)zpl_opts_integer(&opts, "world-size", DEFAULT_WORLD_SIZE);
    uint16_t chunk_size = DEFAULT_CHUNK_SIZE; //zpl_opts_integer(&opts, "chunk-size", DEFAULT_CHUNK_SIZE);
    zpl_string host = zpl_opts_string(&opts, "host", NULL);
    uint16_t port = (uint16_t)zpl_opts_integer(&opts, "port", 0);

    game_kind play_mode = GAMEKIND_SINGLE;

    if (is_viewer_only) play_mode = GAMEKIND_CLIENT;
    if (is_server_only) play_mode = GAMEKIND_HEADLESS;

    if (zpl_opts_has_arg(&opts, "random-seed")) {
        zpl_random rnd={0};
        zpl_random_init(&rnd);
        seed = zpl_random_gen_u32(&rnd);
        zpl_printf("Seed: %u\n", seed);
    }

    if (zpl_opts_has_arg(&opts, "preview-map")) {
        generate_minimap(seed, WORLD_BLOCK_SIZE, chunk_size, world_size);
        return 0;
    }

    sighandler_register();
    game_init(host, port, play_mode, num_viewers, seed, chunk_size, world_size, is_dash_enabled);

#if !defined(PLATFORM_WEB)
    while (game_is_running()) {
        reset_cached_time();
        profile (PROF_MAIN_LOOP) {
            game_input();
            game_update();
            game_render();
        }

        profiler_collate();
    }
#else
    emscripten_set_main_loop(UpdateDrawFrame, 0, 1);
#endif

    game_shutdown();
    sighandler_unregister();

    zpl_string_free(host);
    zpl_opts_free(&opts);
    return 0;
}

#if defined(PLATFORM_WEB)
void UpdateDrawFrame(void) {
    reset_cached_time();
    profile (PROF_MAIN_LOOP) {
        game_input();
        game_update();
        game_render();
    }

    profiler_collate();
}
#endif

static float temp_time = 0.0f;

float get_cached_time(void) {
    return temp_time;
}
void reset_cached_time(void) {
    temp_time = zpl_time_rel();
}