/* Copyright (C) 2023 Salvatore Sanfilippo -- All Rights Reserved
* See the LICENSE file for information about the license. */
#include <furi.h>
#include <furi_hal.h>
#include <storage/storage.h>
#include <input/input.h>
#include <gui/gui.h>
#include <stdlib.h>
#include <gui/gui.h>
#include <gui/view_dispatcher.h>
#include <gui/scene_manager.h>
#include <math.h>
#include <notification/notification.h>
#include <notification/notification_messages.h>
#define TAG "Asteroids" // Used for logging
#define DEBUG_MSG 1
#define SCREEN_XRES 128
#define SCREEN_YRES 64
#define GAME_START_LIVES 3
#define TTLBUL 30 /* Bullet time to live, in ticks. */
#define MAXBUL 5 /* Max bullets on the screen. */
#define MAXAST 32 /* Max asteroids on the screen. */
#define SHIP_HIT_ANIMATION_LEN 15
#define SAVING_DIRECTORY "/ext/apps/Games"
#define SAVING_FILENAME SAVING_DIRECTORY "/game_asteroids.save"
#ifndef PI
#define PI 3.14159265358979f
#endif
/* ============================ Data structures ============================= */
typedef struct Ship {
float x, /* Ship x position. */
y, /* Ship y position. */
vx, /* x velocity. */
vy, /* y velocity. */
rot; /* Current rotation. 2*PI full ortation. */
} Ship;
typedef struct Bullet {
float x, y, vx, vy; /* Fields like in ship. */
uint32_t ttl; /* Time to live, in ticks. */
} Bullet;
typedef struct Asteroid {
float x, y, vx, vy, rot, /* Fields like ship. */
rot_speed, /* Angular velocity (rot speed and sense). */
size; /* Asteroid size. */
uint8_t shape_seed; /* Seed to give random shape. */
} Asteroid;
typedef struct AsteroidsApp {
/* GUI */
Gui* gui;
ViewPort* view_port; /* We just use a raw viewport and we render
everything into the low level canvas. */
FuriMessageQueue* event_queue; /* Keypress events go here. */
/* Game state. */
int running; /* Once false exists the app. */
bool gameover; /* Gameover status. */
uint32_t ticks; /* Game ticks. Increments at each refresh. */
uint32_t score; /* Game score. */
uint32_t highscore; /* Highscore. Shown on Game Over Screen */
bool is_new_highscore; /* Is the last score a new highscore? */
uint32_t lives; /* Number of lives in the current game. */
uint32_t ship_hit; /* When non zero, the ship was hit by an asteroid
and we need to show an animation as long as
its value is non-zero (and decrease it's value
at each tick of animation). */
/* Ship state. */
struct Ship ship;
/* Bullets state. */
struct Bullet bullets[MAXBUL]; /* Each bullet state. */
int bullets_num; /* Active bullets. */
uint32_t last_bullet_tick; /* Tick the last bullet was fired. */
/* Asteroids state. */
Asteroid asteroids[MAXAST]; /* Each asteroid state. */
int asteroids_num; /* Active asteroids. */
uint32_t pressed[InputKeyMAX]; /* pressed[id] is true if pressed.
Each array item contains the time
in milliseconds the key was pressed. */
bool fire; /* Short press detected: fire a bullet. */
} AsteroidsApp;
const NotificationSequence sequence_thrusters = {
&message_vibro_on,
&message_delay_10,
&message_vibro_off,
NULL,
};
const NotificationSequence sequence_brake = {
&message_vibro_on,
&message_delay_10,
&message_delay_1,
&message_delay_1,
&message_vibro_off,
NULL,
};
const NotificationSequence sequence_crash = {
&message_red_255,
&message_vibro_on,
// &message_note_g5, // Play sound but currently disabled
&message_delay_25,
// &message_note_e5,
&message_vibro_off,
&message_sound_off,
NULL,
};
const NotificationSequence sequence_bullet_fired = {
&message_vibro_on,
// &message_note_g5, // Play sound but currently disabled. Need On/Off menu setting
&message_delay_10,
&message_delay_1,
&message_delay_1,
&message_delay_1,
&message_delay_1,
&message_delay_1,
// &message_note_e5,
&message_vibro_off,
&message_sound_off,
NULL,
};
/* ============================== Prototyeps ================================ */
// Only functions called before their definition are here.
bool load_game(AsteroidsApp* app);
void save_game(AsteroidsApp* app);
void restart_game_after_gameover(AsteroidsApp* app);
uint32_t key_pressed_time(AsteroidsApp* app, InputKey key);
/* ============================ 2D drawing ================================== */
/* This structure represents a polygon of at most POLY_MAX points.
* The function draw_poly() is able to render it on the screen, rotated
* by the amount specified. */
#define POLY_MAX 8
typedef struct Poly {
float x[POLY_MAX];
float y[POLY_MAX];
uint32_t points; /* Number of points actually populated. */
} Poly;
/* Define the polygons we use. */
Poly ShipPoly = {{-3, 0, 3}, {-3, 6, -3}, 3};
Poly ShipFirePoly = {{-1.5, 0, 1.5}, {-3, -6, -3}, 3};
/* Rotate the point of the poligon 'poly' and store the new rotated
* polygon in 'rot'. The polygon is rotated by an angle 'a', with
* center at 0,0. */
void rotate_poly(Poly* rot, Poly* poly, float a) {
/* We want to compute sin(a) and cos(a) only one time
* for every point to rotate. It's a slow operation. */
float sin_a = (float)sin(a);
float cos_a = (float)cos(a);
for(uint32_t j = 0; j < poly->points; j++) {
rot->x[j] = poly->x[j] * cos_a - poly->y[j] * sin_a;
rot->y[j] = poly->y[j] * cos_a + poly->x[j] * sin_a;
}
rot->points = poly->points;
}
/* This is an 8 bit LFSR we use to generate a predictable and fast
* pseudorandom sequence of numbers, to give a different shape to
* each asteroid. */
void lfsr_next(unsigned char* prev) {
unsigned char lsb = *prev & 1;
*prev = *prev >> 1;
if(lsb == 1) *prev ^= 0b11000111;
*prev ^= *prev << 7; /* Mix things a bit more. */
}
/* Render the polygon 'poly' at x,y, rotated by the specified angle. */
void draw_poly(Canvas* const canvas, Poly* poly, uint8_t x, uint8_t y, float a) {
Poly rot;
rotate_poly(&rot, poly, a);
canvas_set_color(canvas, ColorBlack);
for(uint32_t j = 0; j < rot.points; j++) {
uint32_t a = j;
uint32_t b = j + 1;
if(b == rot.points) b = 0;
canvas_draw_line(canvas, x + rot.x[a], y + rot.y[a], x + rot.x[b], y + rot.y[b]);
}
}
/* A bullet is just a + pixels pattern. A single pixel is not
* visible enough. */
void draw_bullet(Canvas* const canvas, Bullet* b) {
canvas_draw_dot(canvas, b->x - 1, b->y);
canvas_draw_dot(canvas, b->x + 1, b->y);
canvas_draw_dot(canvas, b->x, b->y);
canvas_draw_dot(canvas, b->x, b->y - 1);
canvas_draw_dot(canvas, b->x, b->y + 1);
}
/* Draw an asteroid. The asteroid shapes is computed on the fly and
* is not stored in a permanent shape structure. In order to generate
* the shape, we use an initial fixed shape that we resize according
* to the asteroid size, perturbate according to the asteroid shape
* seed, and finally draw it rotated of the right amount. */
void draw_asteroid(Canvas* const canvas, Asteroid* ast) {
Poly ap;
/* Start with what is kinda of a circle. Note that this could be
* stored into a template and copied here, to avoid computing
* sin() / cos(). But the Flipper can handle it without problems. */
uint8_t r = ast->shape_seed;
for(int j = 0; j < 8; j++) {
float a = (PI * 2) / 8 * j;
/* Before generating the point, to make the shape unique generate
* a random factor between .7 and 1.3 to scale the distance from
* the center. However this asteroid should have its unique shape
* that remains always the same, so we use a predictable PRNG
* implemented by an 8 bit shift register. */
lfsr_next(&r);
float scaling = .7 + ((float)r / 255 * .6);
ap.x[j] = (float)sin(a) * ast->size * scaling;
ap.y[j] = (float)cos(a) * ast->size * scaling;
}
ap.points = 8;
draw_poly(canvas, &ap, ast->x, ast->y, ast->rot);
}
/* Draw small ships in the top-right part of the screen, one for
* each left live. */
void draw_left_lives(Canvas* const canvas, AsteroidsApp* app) {
int lives = app->lives;
int x = SCREEN_XRES - 5;
Poly mini_ship = {{-2, 0, 2}, {-2, 4, -2}, 3};
while(lives--) {
draw_poly(canvas, &mini_ship, x, 6, PI);
x -= 6;
}
}
/* Given the current position, update it according to the velocity and
* wrap it back to the other side if the object went over the screen. */
void update_pos_by_velocity(float* x, float* y, float vx, float vy) {
/* Return back from one side to the other of the screen. */
*x += vx;
*y += vy;
if(*x >= SCREEN_XRES)
*x = 0;
else if(*x < 0)
*x = SCREEN_XRES - 1;
if(*y >= SCREEN_YRES)
*y = 0;
else if(*y < 0)
*y = SCREEN_YRES - 1;
}
/* Render the current game screen. */
void render_callback(Canvas* const canvas, void* ctx) {
AsteroidsApp* app = ctx;
/* Clear screen. */
canvas_set_color(canvas, ColorWhite);
canvas_draw_box(canvas, 0, 0, SCREEN_XRES - 1, SCREEN_YRES - 1);
/* Draw score. */
canvas_set_color(canvas, ColorBlack);
canvas_set_font(canvas, FontSecondary);
char score[32];
snprintf(score, sizeof(score), "%lu", app->score);
canvas_draw_str(canvas, 0, 8, score);
/* Draw left ships. */
draw_left_lives(canvas, app);
/* Draw ship, asteroids, bullets. */
draw_poly(canvas, &ShipPoly, app->ship.x, app->ship.y, app->ship.rot);
if(key_pressed_time(app, InputKeyUp) > 0) {
notification_message(furi_record_open(RECORD_NOTIFICATION), &sequence_thrusters);
draw_poly(canvas, &ShipFirePoly, app->ship.x, app->ship.y, app->ship.rot);
}
for(int j = 0; j < app->bullets_num; j++) draw_bullet(canvas, &app->bullets[j]);
for(int j = 0; j < app->asteroids_num; j++) draw_asteroid(canvas, &app->asteroids[j]);
/* Game over text. */
if(app->gameover) {
canvas_set_color(canvas, ColorBlack);
canvas_set_font(canvas, FontPrimary);
// TODO: if new highscore, display blinking "New High Score"
// Display High Score
if(app->is_new_highscore) {
canvas_draw_str(canvas, 22, 9, "New High Score!");
} else {
canvas_draw_str(canvas, 36, 9, "High Score");
}
// Convert highscore to string
int length = snprintf(NULL, 0, "%lu", app->highscore);
char* str_high_score = malloc(length + 1);
snprintf(str_high_score, length + 1, "%lu", app->highscore);
// Get length to center on screen
int nDigits = 0;
if(app->highscore > 0) {
nDigits = floor(log10(app->highscore)) + 1;
}
// Draw highscore centered
canvas_draw_str(canvas, (SCREEN_XRES / 2) - (nDigits * 2), 20, str_high_score);
free(str_high_score);
canvas_draw_str(canvas, 28, 35, "GAME OVER");
canvas_set_font(canvas, FontSecondary);
canvas_draw_str(canvas, 25, 50, "Press OK to restart");
}
}
/* ============================ Game logic ================================== */
float distance(float x1, float y1, float x2, float y2) {
float dx = x1 - x2;
float dy = y1 - y2;
return sqrt(dx * dx + dy * dy);
}
/* Detect a collision between the object at x1,y1 of radius r1 and
* the object at x2, y2 of radius r2. A factor < 1 will make the
* function detect the collision even if the objects are yet not
* relly touching, while a factor > 1 will make it detect the collision
* only after they are a bit overlapping. It basically is used to
* rescale the distance.
*
* Note that in this simplified 2D world, objects are all considered
* spheres (this is why this function only takes the radius). This
* is, after all, kinda accurate for asteroids, for bullets, and
* even for the ship "core" itself. */
bool objects_are_colliding(float x1, float y1, float r1, float x2, float y2, float r2, float factor) {
/* The objects are colliding if the distance between object 1 and 2
* is smaller than the sum of the two radiuses r1 and r2.
* So it would be like: sqrt((x1-x2)^2+(y1-y2)^2) < r1+r2.
* However we can avoid computing the sqrt (which is slow) by
* squaring the second term and removing the square root, making
* the comparison like this:
*
* (x1-x2)^2+(y1-y2)^2 < (r1+r2)^2. */
float dx = (x1 - x2) * factor;
float dy = (y1 - y2) * factor;
float rsum = r1 + r2;
return dx * dx + dy * dy < rsum * rsum;
}
/* Create a new bullet headed in the same direction of the ship. */
void ship_fire_bullet(AsteroidsApp* app) {
if(app->bullets_num == MAXBUL) return;
notification_message(furi_record_open(RECORD_NOTIFICATION), &sequence_bullet_fired);
Bullet* b = &app->bullets[app->bullets_num];
b->x = app->ship.x;
b->y = app->ship.y;
b->vx = -sin(app->ship.rot);
b->vy = cos(app->ship.rot);
/* Ship should fire from its head, not in the middle. */
b->x += b->vx * 5;
b->y += b->vy * 5;
/* Give the bullet some velocity (for now the vector is just
* normalized to 1). */
b->vx *= 3;
b->vy *= 3;
/* It's more realistic if we add the velocity vector of the
* ship, too. Otherwise if the ship is going fast the bullets
* will be slower, which is not how the world works. */
b->vx += app->ship.vx;
b->vy += app->ship.vy;
b->ttl = TTLBUL; /* The bullet will disappear after N ticks. */
app->bullets_num++;
}
/* Remove the specified bullet by id (index in the array). */
void remove_bullet(AsteroidsApp* app, int bid) {
/* Replace the top bullet with the empty space left
* by the removal of this bullet. This way we always take the
* array dense, which is an advantage when looping. */
int n = --app->bullets_num;
if(n && bid != n) app->bullets[bid] = app->bullets[n];
}
/* Create a new asteroid, away from the ship. Return the
* pointer to the asteroid object, so that the caller can change
* certain things of the asteroid if needed. */
Asteroid* add_asteroid(AsteroidsApp* app) {
if(app->asteroids_num == MAXAST) return NULL;
float size = 4 + rand() % 15;
float min_distance = 20;
float x, y;
do {
x = rand() % SCREEN_XRES;
y = rand() % SCREEN_YRES;
} while(distance(app->ship.x, app->ship.y, x, y) < min_distance + size);
Asteroid* a = &app->asteroids[app->asteroids_num++];
a->x = x;
a->y = y;
a->vx = 2 * (-.5 + ((float)rand() / RAND_MAX));
a->vy = 2 * (-.5 + ((float)rand() / RAND_MAX));
a->size = size;
a->rot = 0;
a->rot_speed = ((float)rand() / RAND_MAX) / 10;
if(app->ticks & 1) a->rot_speed = -(a->rot_speed);
a->shape_seed = rand() & 255;
return a;
}
/* Remove the specified asteroid by id (index in the array). */
void remove_asteroid(AsteroidsApp* app, int id) {
/* Replace the top asteroid with the empty space left
* by the removal of this one. This way we always take the
* array dense, which is an advantage when looping. */
int n = --app->asteroids_num;
if(n && id != n) app->asteroids[id] = app->asteroids[n];
}
/* Called when an asteroid was reached by a bullet. The asteroid
* hit is the one with the specified 'id'. */
void asteroid_was_hit(AsteroidsApp* app, int id) {
float sizelimit = 6; // Smaller than that polverize in one shot.
Asteroid* a = &app->asteroids[id];
/* Asteroid is large enough to break into fragments. */
float size = a->size;
float x = a->x, y = a->y;
remove_asteroid(app, id);
if(size > sizelimit) {
int max_fragments = size / sizelimit;
int fragments = 2 + rand() % max_fragments;
float newsize = size / fragments;
if(newsize < 2) newsize = 2;
for(int j = 0; j < fragments; j++) {
a = add_asteroid(app);
if(a == NULL) break; // Too many asteroids on screen.
a->x = x + -(size / 2) + rand() % (int)newsize;
a->y = y + -(size / 2) + rand() % (int)newsize;
a->size = newsize;
}
} else {
app->score++;
if(app->score > app->highscore) {
app->is_new_highscore = true;
app->highscore = app->score; // Show on Game Over Screen and future main menu
}
}
}
/* Set gameover state. When in game-over mode, the game displays a gameover
* text with a background of many asteroids floating around. */
void game_over(AsteroidsApp* app) {
if(app->is_new_highscore) save_game(app); // Save highscore but only on change
app->gameover = true;
app->lives = GAME_START_LIVES; // Show 3 lives in game over screen to match new game start
}
/* Function called when a collision between the asteroid and the
* ship is detected. */
void ship_was_hit(AsteroidsApp* app) {
app->ship_hit = SHIP_HIT_ANIMATION_LEN;
if(app->lives) {
app->lives--;
} else {
game_over(app);
}
}
/* Restart game after the ship is hit. Will reset the ship position, bullets
* and asteroids to restart the game. */
void restart_game(AsteroidsApp* app) {
app->ship.x = SCREEN_XRES / 2;
app->ship.y = SCREEN_YRES / 2;
app->ship.rot = PI; /* Start headed towards top. */
app->ship.vx = 0;
app->ship.vy = 0;
app->bullets_num = 0;
app->last_bullet_tick = 0;
app->asteroids_num = 0;
app->ship_hit = 0;
}
/* Called after gameover to restart the game. This function
* also calls restart_game(). */
void restart_game_after_gameover(AsteroidsApp* app) {
app->gameover = false;
app->ticks = 0;
app->score = 0;
app->is_new_highscore = false;
app->lives = GAME_START_LIVES - 1;
restart_game(app);
}
/* Move bullets. */
void update_bullets_position(AsteroidsApp* app) {
for(int j = 0; j < app->bullets_num; j++) {
update_pos_by_velocity(
&app->bullets[j].x, &app->bullets[j].y, app->bullets[j].vx, app->bullets[j].vy);
if(--app->bullets[j].ttl == 0) {
remove_bullet(app, j);
j--; /* Process this bullet index again: the removal will
fill it with the top bullet to take the array dense. */
}
}
}
/* Move asteroids. */
void update_asteroids_position(AsteroidsApp* app) {
for(int j = 0; j < app->asteroids_num; j++) {
update_pos_by_velocity(
&app->asteroids[j].x, &app->asteroids[j].y, app->asteroids[j].vx, app->asteroids[j].vy);
app->asteroids[j].rot += app->asteroids[j].rot_speed;
if(app->asteroids[j].rot < 0)
app->asteroids[j].rot = 2 * PI;
else if(app->asteroids[j].rot > 2 * PI)
app->asteroids[j].rot = 0;
}
}
/* Collision detection and game state update based on collisions. */
void detect_collisions(AsteroidsApp* app) {
/* Detect collision between bullet and asteroid. */
for(int j = 0; j < app->bullets_num; j++) {
Bullet* b = &app->bullets[j];
for(int i = 0; i < app->asteroids_num; i++) {
Asteroid* a = &app->asteroids[i];
if(objects_are_colliding(a->x, a->y, a->size, b->x, b->y, 1.5, 1)) {
asteroid_was_hit(app, i);
remove_bullet(app, j);
/* The bullet no longer exist. Break the loop.
* However we want to start processing from the
* same bullet index, since now it is used by
* another bullet (see remove_bullet()). */
j--; /* Scan this j value again. */
break;
}
}
}
/* Detect collision between ship and asteroid. */
for(int j = 0; j < app->asteroids_num; j++) {
Asteroid* a = &app->asteroids[j];
if(objects_are_colliding(a->x, a->y, a->size, app->ship.x, app->ship.y, 4, 1)) {
ship_was_hit(app);
break;
}
}
}
/* This is the main game execution function, called 10 times for
* second (with the Flipper screen latency, an higher FPS does not
* make sense). In this function we update the position of objects based
* on velocity. Detect collisions. Update the score and so forth.
*
* Each time this function is called, app->tick is incremented. */
void game_tick(void* ctx) {
AsteroidsApp* app = ctx;
/* There are two special screens:
*
* 1. Ship was hit, we frozen the game as long as ship_hit isn't zero
* again, and show an animation of a rotating ship. */
if(app->ship_hit) {
notification_message(furi_record_open(RECORD_NOTIFICATION), &sequence_crash);
app->ship.rot += 0.5;
app->ship_hit--;
view_port_update(app->view_port);
if(app->ship_hit == 0) {
restart_game(app);
}
return;
} else if(app->gameover) {
/* 2. Game over. We need to update only background asteroids. In this
* state the game just displays a GAME OVER text with the floating
* asteroids in backgroud. */
if(key_pressed_time(app, InputKeyOk) > 100) {
restart_game_after_gameover(app);
}
update_asteroids_position(app);
view_port_update(app->view_port);
return;
}
/* Handle keypresses. */
if(app->pressed[InputKeyLeft]) app->ship.rot -= .35;
if(app->pressed[InputKeyRight]) app->ship.rot += .35;
if(app->pressed[InputKeyUp]) {
app->ship.vx -= 0.5 * (float)sin(app->ship.rot);
app->ship.vy += 0.5 * (float)cos(app->ship.rot);
} else if(app->pressed[InputKeyDown]) {
notification_message(furi_record_open(RECORD_NOTIFICATION), &sequence_brake);
app->ship.vx *= 0.75;
app->ship.vy *= 0.75;
}
/* Fire a bullet if needed. app->fire is set in
* asteroids_update_keypress_state() since depends on exact
* pressure timing. */
if(app->fire) {
uint32_t bullet_min_period = 200; // In milliseconds
uint32_t now = furi_get_tick();
if(now - app->last_bullet_tick >= bullet_min_period) {
ship_fire_bullet(app);
app->last_bullet_tick = now;
}
app->fire = false;
}
/* Update positions and detect collisions. */
update_pos_by_velocity(&app->ship.x, &app->ship.y, app->ship.vx, app->ship.vy);
update_bullets_position(app);
update_asteroids_position(app);
detect_collisions(app);
/* From time to time, create a new asteroid. The more asteroids
* already on the screen, the smaller probability of creating
* a new one. */
if(app->asteroids_num == 0 || (random() % 5000) < (30 / (1 + app->asteroids_num))) {
add_asteroid(app);
}
app->ticks++;
view_port_update(app->view_port);
}
/* ======================== Flipper specific code =========================== */
bool load_game(AsteroidsApp* app) {
Storage* storage = furi_record_open(RECORD_STORAGE);
File* file = storage_file_alloc(storage);
uint16_t bytes_readed = 0;
if(storage_file_open(file, SAVING_FILENAME, FSAM_READ, FSOM_OPEN_EXISTING)) {
bytes_readed = storage_file_read(file, app, sizeof(AsteroidsApp));
}
storage_file_close(file);
storage_file_free(file);
furi_record_close(RECORD_STORAGE);
return bytes_readed == sizeof(AsteroidsApp);
}
void save_game(AsteroidsApp* app) {
Storage* storage = furi_record_open(RECORD_STORAGE);
if(storage_common_stat(storage, SAVING_DIRECTORY, NULL) == FSE_NOT_EXIST) {
if(!storage_simply_mkdir(storage, SAVING_DIRECTORY)) {
return;
}
}
File* file = storage_file_alloc(storage);
if(storage_file_open(file, SAVING_FILENAME, FSAM_WRITE, FSOM_CREATE_ALWAYS)) {
storage_file_write(file, app, sizeof(AsteroidsApp));
}
storage_file_close(file);
storage_file_free(file);
furi_record_close(RECORD_STORAGE);
}
/* Here all we do is putting the events into the queue that will be handled
* in the while() loop of the app entry point function. */
void input_callback(InputEvent* input_event, void* ctx) {
AsteroidsApp* app = ctx;
furi_message_queue_put(app->event_queue, input_event, FuriWaitForever);
}
/* Allocate the application state and initialize a number of stuff.
* This is called in the entry point to create the application state. */
AsteroidsApp* asteroids_app_alloc() {
AsteroidsApp* app = malloc(sizeof(AsteroidsApp));
load_game(app);
app->gui = furi_record_open(RECORD_GUI);
app->view_port = view_port_alloc();
view_port_draw_callback_set(app->view_port, render_callback, app);
view_port_input_callback_set(app->view_port, input_callback, app);
gui_add_view_port(app->gui, app->view_port, GuiLayerFullscreen);
app->event_queue = furi_message_queue_alloc(8, sizeof(InputEvent));
app->running = 1; /* Turns 0 when back is pressed. */
restart_game_after_gameover(app);
memset(app->pressed, 0, sizeof(app->pressed));
return app;
}
/* Free what the application allocated. It is not clear to me if the
* Flipper OS, once the application exits, will be able to reclaim space
* even if we forget to free something here. */
void asteroids_app_free(AsteroidsApp* app) {
furi_assert(app);
// View related.
view_port_enabled_set(app->view_port, false);
gui_remove_view_port(app->gui, app->view_port);
view_port_free(app->view_port);
furi_record_close(RECORD_GUI);
furi_message_queue_free(app->event_queue);
app->gui = NULL;
free(app);
}
/* Return the time in milliseconds the specified key is continuously
* pressed. Or 0 if it is not pressed. */
uint32_t key_pressed_time(AsteroidsApp* app, InputKey key) {
return app->pressed[key] == 0 ? 0 : furi_get_tick() - app->pressed[key];
}
/* Handle keys interaction. */
void asteroids_update_keypress_state(AsteroidsApp* app, InputEvent input) {
// Allow Rapid fire
if(input.key == InputKeyOk) {
app->fire = true;
}
if(input.type == InputTypePress) {
app->pressed[input.key] = furi_get_tick();
} else if(input.type == InputTypeRelease) {
app->pressed[input.key] = 0;
}
}
int32_t asteroids_app_entry(void* p) {
UNUSED(p);
AsteroidsApp* app = asteroids_app_alloc();
/* Create a timer. We do data analysis in the callback. */
FuriTimer* timer = furi_timer_alloc(game_tick, FuriTimerTypePeriodic, app);
furi_timer_start(timer, furi_kernel_get_tick_frequency() / 10);
/* This is the main event loop: here we get the events that are pushed
* in the queue by input_callback(), and process them one after the
* other. */
InputEvent input;
while(app->running) {
FuriStatus qstat = furi_message_queue_get(app->event_queue, &input, 100);
if(qstat == FuriStatusOk) {
if(DEBUG_MSG)
FURI_LOG_E(TAG, "Main Loop - Input: type %d key %u", input.type, input.key);
/* Handle navigation here. Then handle view-specific inputs
* in the view specific handling function. */
if(input.type == InputTypeLong && input.key == InputKeyBack) {
// Save High Score even if player didn't finish game
if(app->is_new_highscore) save_game(app); // Save highscore but only on change
app->running = 0;
} else {
asteroids_update_keypress_state(app, input);
}
} else {
/* Useful to understand if the app is still alive when it
* does not respond because of bugs. */
if(DEBUG_MSG) {
static int c = 0;
c++;
if(!(c % 20)) FURI_LOG_E(TAG, "Loop timeout");
}
}
}
furi_timer_free(timer);
asteroids_app_free(app);
return 0;
}