prosperon/source/engine/yugine.c

#include "yugine.h"

#include "camera.h"
#include "engine.h"
#include "font.h"
#include "gameobject.h"
#include "input.h"
#include "openglrender.h"
#include "window.h"

#define MINIAUDIO_IMPLEMENTATION
#include "miniaudio.h"

#include "timer.h"

#include "quickjs/quickjs.h"

#include "ffi.h"
#include "script.h"

#include "log.h"
#include <stdio.h>
#include <stdlib.h>

#include "2dphysics.h"

#include <execinfo.h>
#include <signal.h>
#include <time.h>

#include "string.h"

#define SOKOL_TRACE_HOOKS
#define SOKOL_GFX_IMPL
#define SOKOL_GLCORE33
#include "sokol/sokol_gfx.h"

int physOn = 0;

double renderlag = 0;
double physlag = 0;
double updatelag = 0;

double renderMS = 1 / 165.f;
double physMS = 1 / 120.f;
double updateMS = 1 / 60.f;

static int ed = 1;
static int sim_play = 0;
static double lastTick;
static int phys_step = 0;

static float timescale = 1.f;

#define FPSBUF 10
static double framems[FPSBUF];
int framei = 0;
int fps;

#define SIM_STOP 0
#define SIM_PLAY 1
#define SIM_PAUSE 2
#define SIM_STEP 3

void print_stacktrace() {
  void *ents[512];
  size_t size;

  size = backtrace(ents, 512);

  YughCritical("====================BACKTRACE====================");
  char **stackstr = backtrace_symbols(ents, size);

  YughInfo("Stack size is %d.", size);

  for (int i = 0; i < size; i++)
    YughCritical(stackstr[i]);

  js_stacktrace();
}

void seghandle(int sig) {
#ifdef __linux__
  if (strsignal(sig))
    YughCritical("CRASH! Signal: %s.", strsignal(sig));

  print_stacktrace();

  exit(1);
#endif
}

void compile_script(const char *file) {
  const char *script = slurp_text(file);
  JSValue obj = JS_Eval(js, script, strlen(script), file, JS_EVAL_FLAG_COMPILE_ONLY | JS_EVAL_TYPE_GLOBAL);
  size_t out_len;
  uint8_t *out;
  out = JS_WriteObject(js, &out_len, obj, JS_WRITE_OBJ_BYTECODE);

  FILE *f = fopen("out.jsc", "w");
  fwrite(out, sizeof out[0], out_len, f);
  fclose(f);
}

void sg_logging(const char *tag, uint32_t lvl, uint32_t id, const char *msg, uint32_t line, const char *file, void *data) {
  mYughLog(0, 1, line, file, "tag: %s, msg: %s", tag, msg);
}

int main(int argc, char **args) {
  int logout = 1;
  ed = 1;

  script_startup();

  for (int i = 1; i < argc; i++) {
    if (args[i][0] == '-') {
      switch (args[i][1]) {
      case 'p':
        ed = 0;
        break;

      case 'l':
        if (i + 1 < argc && args[i + 1][0] != '-') {
          log_setfile(args[i + 1]);
          i++;
          continue;
        } else {
          YughError("Expected a file for command line arg '-l'.");
          exit(1);
        }

      case 'v':
        printf("Yugine version %s, %s build.\n", VER, INFO);
        printf("Copyright 2022-2023 odplot productions LLC.\n");
        exit(1);
        break;

      case 's':
        compile_script(args[2]);
        exit(0);

      case 'm':
        logLevel = atoi(args[2]);
        break;

      case 'h':
        printf("-l       Set log file\n");
        printf("-p    Launch engine in play mode instead of editor mode\n");
        printf("-v       Display engine info\n");
        printf("-c       Redirect logging to console\n");
        exit(0);
        break;

      case 'c':
        logout = 0;
        break;
      }
    }
  }

#if DBG
  if (logout) {
    time_t now = time(NULL);
    char fname[100];
    snprintf(fname, 100, "yugine-%d.log", now);
    log_setfile(fname);
  }

  YughInfo("Starting yugine version %s.", VER);

  FILE *sysinfo = NULL;
  /*    sysinfo = popen("uname -a", "r");
      if (!sysinfo) {
          YughWarn("Failed to get sys info.");
      } else {
          log_cat(sysinfo);
          pclose(sysinfo);
      }*/
  signal(SIGSEGV, seghandle);
  signal(SIGABRT, seghandle);
  signal(SIGFPE, seghandle);
  signal(SIGBUS, seghandle);

#endif

  engine_init();

  const GLFWvidmode *vidmode = glfwGetVideoMode(glfwGetPrimaryMonitor());
  YughInfo("Refresh rate is %d", vidmode->refreshRate);

  renderMS = 1.0 / vidmode->refreshRate;

  sg_setup(&(sg_desc){
      .logger = {
          .func = sg_logging,
          .user_data = NULL,
      },
      .buffer_pool_size = 1024,
      .context.sample_count = 1,
  });

  input_init();
  openglInit();

  if (ed)
    script_dofile("scripts/editor.js");
  else
    script_dofile("scripts/play.js");

  while (!want_quit()) {
    double elapsed = glfwGetTime() - lastTick;
    deltaT = elapsed;
    lastTick = glfwGetTime();
    double wait = fmax(0, renderMS - elapsed);
    input_poll(wait);
    window_all_handle_events();

    framems[framei++] = elapsed;

    if (framei == FPSBUF) framei = 0;

    if (sim_play == SIM_PLAY || sim_play == SIM_STEP) {
      timer_update(elapsed * timescale);
      physlag += elapsed;
      call_updates(elapsed * timescale);
      while (physlag >= physMS) {
        phys_step = 1;
        physlag -= physMS;
        phys2d_update(physMS * timescale);
        call_physics(physMS * timescale);
        if (sim_play == SIM_STEP) sim_pause();
        phys_step = 0;
      }
    }

    renderlag += elapsed;

    if (renderlag >= renderMS) {
      renderlag -= renderMS;
      window_renderall();
    }

    gameobjects_cleanup();
  }

  return 0;
}

int frame_fps() {
  double fpsms = 0;
  for (int i = 0; i < FPSBUF; i++) {
    fpsms += framems[i];
  }

  return FPSBUF / fpsms;
}

int sim_playing() { return sim_play == SIM_PLAY; }
int sim_paused() { return sim_play == SIM_PAUSE; }
int sim_stopped() { return sim_play == SIM_STOP; }

void sim_start() {
  sim_play = SIM_PLAY;
}

void sim_pause() {
  sim_play = SIM_PAUSE;
}

void sim_stop() {
  /* Revert starting state of everything from sim_start */
  sim_play = SIM_STOP;
}

int phys_stepping() { return phys_step; }

void sim_step() {
  if (sim_paused()) {
    YughInfo("Step");
    sim_play = SIM_STEP;
  }
}

void set_timescale(float val) {
  timescale = val;
}