momento/src/main.c

/* SPDX-License-Identifier: GPL-3.0-or-later */
/* Copyright (C) 2021 KikooDX */

#include "conf.h"
#include "level.h"
#include "particles.h"
#include "player.h"
#include <gint/clock.h>
#include <gint/display.h>
#include <gint/gint.h>
#include <gint/keyboard.h>
#include <gint/timer.h>

#define PANIC(msg)                                                     \
	{                                                              \
		dclear(C_BLACK);                                       \
		dprint_opt(DWIDTH / 2, DHEIGHT / 2, C_RED, C_NONE,     \
		           DTEXT_CENTER, DTEXT_MIDDLE, "ERROR: %s",    \
		           msg);                                       \
		dupdate();                                             \
		getkey();                                              \
		return 0;                                              \
	}

extern struct Level level;
extern int level_id;
extern int fatal_error;
extern char *fatal_error_msg;

static int callback(volatile void *arg);

int main(void)
{
	int i;
	int timer;
	int player_return_code;
	volatile int has_ticked = 1;

	/* load level */
	level_id = 0;
	gint_switch(level_load);
	if (fatal_error == -1)
		PANIC(fatal_error_msg);
	/* create player */
	struct Player player = player_init();
	/* initialize particle engine */
	particles_init();
	/* timer setup */
	timer = timer_setup(TIMER_ANY, 1000000 / TARGET_UPS, callback,
	                    &has_ticked);
	if (timer == -1)
		PANIC("timer_setup failed");
	timer_start(timer);

	/* main game loop */
	while (!keydown(KEY_EXIT)) {
		/* do x updates per frame, x being ups/fps */
		i = TARGET_UPS / TARGET_FPS;
		while (i-- > 0) {
			/* speed limiter */
			while (!has_ticked)
				sleep();
			has_ticked = 0;
			/* update */
			clearevents();
			particles_update();
			player_return_code = player_update(&player);
			switch (player_return_code) {
			case 1:
				level_id += 1;
				gint_switch(level_load);
				if (fatal_error == -1)
					PANIC(fatal_error_msg);
				particles_init();
				player = player_init();
				break;
			case -1:
				gint_switch(level_load);
				if (fatal_error == -1)
					PANIC(fatal_error_msg);
				particles_init();
				player = player_init();
				break;
			default:
				break;
			}
		}
		/* draw */
		dclear(C_BLACK);
		level_draw();
		player_draw(player);
		particles_draw();
		dupdate();
	}

	timer_stop(timer);
	return 1;
}

static int callback(volatile void *arg)
{
	volatile int *has_ticked = arg;
	*has_ticked = 1;
	return 0;
}