Add stage selection screen

Makefile

@@ -2,7 +2,7 @@
 .SUFFIXES: .inc .txt
 
 NAME = platformer
-TILES = grass_tile.inc dirt_tile.inc flag_tile.inc
+TILES = grass_tile.inc dirt_tile.inc flag_tile.inc stage1_tile.inc stage2_tile.inc
 
 all: $(NAME)
 

platformer.c

@@ -13,6 +13,10 @@
 #include <time.h>
 #include <timespec.h>
 
+#define STAGES 2
+enum game_mode { TITLESCREEN, STAGE };
+enum game_mode game_mode = TITLESCREEN;
+
 #define PLAYFIELD_SIDE 100
 #define TILE_SIDE 10
 #define TILES (PLAYFIELD_SIDE / TILE_SIDE)
@@ -28,11 +32,13 @@ enum palette {
 };
 static enum palette playfield[PLAYFIELD_SIDE * PLAYFIELD_SIDE];
 
-
 #include "grass_tile.inc"
 #include "dirt_tile.inc"
 #include "flag_tile.inc"
 
+#include "stage1_tile.inc"
+#include "stage2_tile.inc"
+
 static char tilemap[] = "          "
                         "          "
                         "          "
@@ -42,7 +48,7 @@ static char tilemap[] = "          "
                         "        g "
                         "     g    "
                         "@   gdg   "
-                        "ggggdddggg";
+                        "gg  dddgg ";
 
 static uint32_t main_window = 0;
 static uint32_t window_width = 600;
@@ -57,7 +63,6 @@ static void on_disconnect(void *context) {
 
 static bool left_held, right_held, jump_held;
 
-static double jump_maxhold = 0.3;
 static double jump_maxheight = 21;
 static double jump_duration = 0.4;
 
@@ -115,7 +120,7 @@ static double in_jump;
 static double player_x, player_y;
 static double player_dx, player_dy;
 
-static void initialize(void) {
+static void initialize_stage(void) {
 	jumping = false;
 	on_ground = false;
 	player_dx = 0;
@@ -131,7 +136,19 @@ static void initialize(void) {
 	}
 }
 
-static void update(struct timespec now, struct timespec dt_timespec) {
+static size_t selection_index = 0;
+static bool keys_released;
+static bool stage_selected; 
+
+static void initialize(void) {
+	switch (game_mode) {
+		case TITLESCREEN: keys_released = false; stage_selected = false; break;
+		case STAGE: initialize_stage(); break;
+		default: printf("%i\n", game_mode); break;
+	}
+}
+
+static void update_stage(struct timespec now, struct timespec dt_timespec) {
 	(void) now;
 	double dt = timespec2double(dt_timespec);
 	player_x += player_dx * dt;
@@ -140,7 +157,6 @@ static void update(struct timespec now, struct timespec dt_timespec) {
 	else if (right_held) player_dx = 30;
 	else player_dx = 0;
 
-	(void) jump_maxhold;
 	if (on_ground && jump_held && !jumping) {
 		jumping = true;
 		in_jump = 0;
@@ -200,6 +216,9 @@ static void update(struct timespec now, struct timespec dt_timespec) {
 	} else if (player_y > PLAYFIELD_SIDE - TILE_SIDE) {
 		player_y = PLAYFIELD_SIDE - TILE_SIDE;
 		player_dy = 0;
+		game_mode = TITLESCREEN;
+		initialize();
+		return;
 	}
 
 	// Collision against tiles
@@ -251,6 +270,33 @@ static void update(struct timespec now, struct timespec dt_timespec) {
 	}
 }
 
+static void update_titlescreen(struct timespec now, struct timespec dt_timespec) {
+	(void) now;
+	(void) dt_timespec;
+	if (keys_released && left_held && selection_index > 0)
+		selection_index--;
+	if (keys_released && right_held && selection_index < STAGES - 1)
+		selection_index++;
+	if (keys_released && jump_held)
+		stage_selected = true;
+	if (!left_held && !right_held && !jump_held)
+		keys_released = true;
+	else
+		keys_released = false;
+	if (stage_selected && keys_released) {
+		game_mode = STAGE;
+		initialize();
+	}
+}
+
+static void update(struct timespec now, struct timespec dt_timespec) {
+	switch (game_mode) {
+		case TITLESCREEN: update_titlescreen(now, dt_timespec); break;
+		case STAGE: update_stage(now, dt_timespec); break;
+		default: printf("%i\n", game_mode); break;
+	}
+}
+
 static void draw_tile(enum palette tile[], size_t x, size_t y) {
 	assert(x + TILE_SIDE <= PLAYFIELD_SIDE);
 	assert(y + TILE_SIDE <= PLAYFIELD_SIDE);
@@ -278,12 +324,30 @@ static void draw_tiles(void) {
 	}
 }
 
-static void draw(void) {
+static void draw_stage(void) {
 	memset(playfield, 0, sizeof(playfield));
 	draw_tiles();
 	draw_tile(grass_tile, player_x, player_y);
 }
 
+static void draw_titlescreen(void) {
+	memset(playfield, 0, sizeof(playfield));
+	draw_tile(stage1_tile, 1 * TILE_SIDE, TILE_SIDE);
+	draw_tile(stage2_tile, 2 * TILE_SIDE, TILE_SIDE);
+	size_t underline_y = 2 * TILE_SIDE + 1;
+	size_t underline_x = selection_index * TILE_SIDE + TILE_SIDE + 2;
+	for (size_t x = 0; x < TILE_SIDE - 4; x++)
+		playfield[underline_y * PLAYFIELD_SIDE + underline_x + x] = TEXT;
+}
+
+static void draw(void) {
+	switch (game_mode) {
+		case TITLESCREEN: draw_titlescreen(); break;
+		case STAGE: draw_stage(); break;
+		default: printf("%i\n", game_mode); break;
+	}
+}
+
 int main(int argc, char *argv[]) {
 	struct display_connection *connection = display_connect_default();
 	if (!connection && errno == ECONNREFUSED)

stage1_tile.txt

@@ -0,0 +1,13 @@
+xTEXT
+.BG
+----------
+....xx....
+...xxx....
+..xxxx....
+.xx.xx....
+....xx....
+....xx....
+....xx....
+....xx....
+....xx....
+.xxxxxxxx.

stage2_tile.txt

@@ -0,0 +1,13 @@
+xTEXT
+.BG
+----------
+....xxx...
+...xx.xx..
+..xx...xx.
+......xx..
+.....xx...
+....xx....
+...xx.....
+..xx......
+.xx.......
+.xxxxxxxx.