Player can jump

Jump in the air, touch the sky

include/conf.h

@@ -13,3 +13,6 @@
 #define FRC_AIR     (ACC_AIR / MAX_HSPD)
 #define AIR_RES     0.02
 #define GRAVITY     0.2
+#define JUMP_SPD    -4.0
+#define JUMP_BUFFER 10
+#define JUMP_GRACE  10

include/player.h

@@ -14,6 +14,10 @@ struct Player {
 	float spd_y;
 	float rem_x;
 	float rem_y;
+	/* keys and buffering */
+	int k_jump_previous;
+	int jump_buffer;
+	int jump_grace;
 };
 
 /* used for collisions */

src/player/draw.c

@@ -8,10 +8,5 @@ extern bopti_image_t bimg_player;
 
 void player_draw(struct Player player)
 {
-	Tile collisions[COLLIDE_POINTS];
-	int i;
-	player_collide(collisions, player.x, player.y);
-	for (i = 0; i < COLLIDE_POINTS; i += 1)
-		dprint(0, i * 20, C_WHITE, "%d: %d", i, collisions[i]);
 	dimage(player.x, player.y, &bimg_player);
 }

src/player/init.c

@@ -17,6 +17,9 @@ struct Player player_init(void)
 	    .spd_y = 0.0,
 	    .rem_x = 0.0,
 	    .rem_y = 0.0,
+	    .k_jump_previous = 0,
+	    .jump_buffer = 0,
+	    .jump_grace = 0,
 	};
 
 	/* find spawn position in level */

src/player/update.c

@@ -16,6 +16,9 @@ void player_update(struct Player *player)
 	/* process input */
 	const int dir_x = keydown(KEY_RIGHT) - keydown(KEY_LEFT);
 	/* const int dir_y = keydown(KEY_DOWN) - keydown(KEY_UP); */
+	const int k_jump = keydown(KEY_SHIFT);
+	const int kp_jump = k_jump && (!player->k_jump_previous);
+	player->k_jump_previous = k_jump;
 
 	/* horizontal friction/acceleration */
 	player->spd_x *= (on_ground) ? (1 - FRC_GND) : (1 - FRC_AIR);
@@ -38,6 +41,24 @@ void player_update(struct Player *player)
 		player->spd_y += GRAVITY * factor;
 	}
 
+	/* input buffer */
+	if (kp_jump)
+		player->jump_buffer = JUMP_BUFFER;
+	else if (player->jump_buffer)
+		player->jump_buffer -= 1;
+	/* grace frames */
+	if (on_ground)
+		player->jump_grace = JUMP_GRACE;
+	else if (player->jump_grace)
+		player->jump_grace -= 1;
+
+	/* jump (youhou) */
+	if (k_jump && player->jump_buffer && player->jump_grace) {
+		player->spd_y = JUMP_SPD;
+		player->jump_buffer = 0;
+		player->jump_grace = 0;
+	}
+
 	/* speed reminder */
 	const float spd_n_rem_x = player->spd_x + player->rem_x;
 	const int spd_x = (int)spd_n_rem_x;