Add pausing

game.c

@@ -123,6 +123,9 @@ static float aspect;
 static unsigned level;
 
 static bool dead;
+static bool clear;
+static bool paused;
+
 static unsigned asteroid_count;
 static uint8_t counter;
 static unsigned score;
@@ -233,10 +236,10 @@ static void spawn_asteroid()
 	const float rnd = rng_canon();
 	if (rnd < 0.4)
 		r = ASTEROID_MEDIUM;
-	else if (rnd < 0.8)
+	else if (level > 3 && rnd < 0.45)
-		r = ASTEROID_LARGE;
-	else
 		r = ASTEROID_HUGE;
+	else
+		r = ASTEROID_LARGE;
 
 	unsigned id;
 	entity_t *e = gen_asteroid(r, &id);
@@ -349,7 +352,9 @@ static void bounce(collision_t c)
 
 static void cleared()
 {
+	clear = true;
 	renderer_set_wrap(false);
+	counter = 0;
 }
 
 static void destroy_asteroid(entity_t *a, vec2_t shot_vel)
@@ -401,6 +406,13 @@ static void destroy_asteroid(entity_t *a, vec2_t shot_vel)
 	}
 }
 
+static void die()
+{
+	dead = true;
+	clear = false;
+	counter = 0;
+}
+
 static void handle_collisions(const collision_t *collisions, unsigned count)
 {
 	for (unsigned i = 0; i < count; ++i) {
@@ -409,7 +421,7 @@ static void handle_collisions(const collision_t *collisions, unsigned count)
 		entity_t *b = entities + c.entities[1];
 
 		if (a->tag == COLLISION_SHIP || b->tag == COLLISION_SHIP) {
-			dead = true;
+			die();
 			continue;
 		}
 
@@ -459,7 +471,8 @@ static void draw_arrow()
 static void create_field()
 {
 	dead = false;
-	counter = 0;
+	clear = false;
+	paused = false;
 	entity_count = shape_count = 0;
 	asteroid_count = 0;
 
@@ -497,10 +510,17 @@ static void reset()
 	create_field();
 }
 
+static void pause()
+{
+	paused = !paused;
+	counter = 0;
+}
+
 void game_init(float _aspect)
 {
 	input_on_shoot(shoot);
 	input_on_restart(reset);
+	input_on_pause(pause);
 	aspect = _aspect;
 
 	reset();
@@ -508,9 +528,9 @@ void game_init(float _aspect)
 
 void game_update()
 {
-	if (dead || asteroid_count == 0)
+	if (dead || clear || paused)
 		++counter;
-	if (dead)
+	if (dead || paused)
 		return;
 
 	ship_update();
@@ -521,7 +541,7 @@ void game_update()
 		e->dir = mat2_mul_mat2(mat2_rotation(e->omg), e->dir);
 		e->pos = vec2_add(e->pos, e->vel);
 
-		if (asteroid_count == 0 && i == ship_entity_id) {
+		if (clear && i == ship_entity_id) {
 			if (e->pos.x > aspect)
 				win();
 		}
@@ -560,10 +580,15 @@ void game_draw()
 
 	text_draw_score(aspect, score);
 
+	if (paused && !(counter & COUNTER_MASK)) {
+		text_draw_centre("PAUSED");
+		return;
+	}
+
 	if (dead && !(counter & COUNTER_MASK))
 		text_draw_centre("GAME OVER");
 
-	if (!dead && asteroid_count == 0) {
+	if (clear) {
 		draw_arrow();
 		if (!(counter & COUNTER_MASK))
 			text_draw_centre("CLEAR");

input.c

@@ -19,6 +19,7 @@ static int input_fd;
 static input_callback_t restart;
 static input_callback_t quit;
 static input_callback_t shoot;
+static input_callback_t pause_;
 
 static void key_press(int key)
 {
@@ -46,6 +47,9 @@ static void key_press(int key)
 		if (shoot != nullptr)
 			shoot();
 		break;
+	case KEY_P:
+		if (pause_ != nullptr)
+			pause_();
 	}
 }
 
@@ -74,7 +78,7 @@ static void key_repeat(int key)
 int input_init()
 {
 	memset(&input, 0, sizeof(input));
-	shoot = nullptr;
+	shoot = restart = quit = pause_ = nullptr;
 
 	input_fd = open("/dev/input/event0", O_RDONLY);
 	assert(input_fd != -1);
@@ -105,6 +109,11 @@ void input_on_quit(input_callback_t cb)
 	quit = cb;
 }
 
+void input_on_pause(input_callback_t cb)
+{
+	pause_ = cb;
+}
+
 void input_handle()
 {
 	struct input_event ev;

input.h

@@ -16,6 +16,7 @@ void input_cleanup();
 void input_on_shoot(input_callback_t cb);
 void input_on_restart(input_callback_t cb);
 void input_on_quit(input_callback_t cb);
+void input_on_pause(input_callback_t cb);
 
 void input_handle();
 

text.c

@@ -130,6 +130,13 @@ static const glyph_t font[] = {
 			{ { 1, 4 }, { -1, 4 }, { -1, -4 }, { 1, -4 } },
 		},
 	},
+	['D'] = {
+		.line_count = 1,
+		.line_lens = { 5 },
+		.lines = {
+			{ { -1, 4 }, { -1, -4 }, { 1, -4 }, { 0, 4 }, { -1, 4 } },
+		},
+	},
 	['E'] = {
 		.line_count = 2,
 		.line_lens = { 4, 2 },
@@ -166,6 +173,13 @@ static const glyph_t font[] = {
 			{ { -1, 4 }, { -1, -4 }, { 1, -4 }, { 1, 4 }, { -1, 4 } },
 		},
 	},
+	['P'] = {
+		.line_count = 1,
+		.line_lens = { 5 },
+		.lines = {
+			{ { -1, -4 }, { -1, 4 }, { 1, 4 }, { 1, -2 }, { -1, -2 } },
+		},
+	},
 	['R'] = {
 		.line_count = 1,
 		.line_lens = { 6 },
@@ -176,6 +190,23 @@ static const glyph_t font[] = {
 			},
 		},
 	},
+	['S'] = {
+		.line_count = 1,
+		.line_lens = { 6 },
+		.lines = {
+			{
+				{ 1, 4 }, { -1, 4 }, { -1, -2 },
+				{ 1, -2 }, { 1, -4 }, { -1, -4 },
+			},
+		},
+	},
+	['U'] = {
+		.line_count = 1,
+		.line_lens = { 4 },
+		.lines = {
+			{ { -1, 4 }, { -1, -4 }, { 1, -4 }, { 1, 4 } },
+		},
+	},
 	['V'] = {
 		.line_count = 1,
 		.line_lens = { 3 },