game flow (pun intended)

CMakeLists.txt

@@ -16,6 +16,7 @@ set(SOURCES
 	src/main.c
 	src/util.c
 	src/level/load.c
+	src/level/update.c
 	src/level/draw.c
 	src/level/get_tile.c
 	src/level/is_water.c

include/conf.h

@@ -19,6 +19,7 @@
 #define JUMP_SPD      -4.0
 #define AIR_JMP_SPD   -3.0
 #define SWIM_SPD      -1.0
+#define SWIM_OUT_SPD  -1.6
 #define BOUNCE_SPD    -5.0
 #define JUMP_BUFFER   10
 #define JUMP_GRACE    6
@@ -26,4 +27,6 @@
 #define BURST_BOOST   0.5
 #define V_TRANS_SPD   (1.0 / 20.0)
 #define H_TRANS_SPD   (1.0 / 20.0)
+#define WATER_FLOW    16
+#define WATER_FRAMES  4
 /* #define RECORDING */

include/level.h

@@ -22,6 +22,7 @@ struct Level {
 	Tile data[LEVEL_WIDTH * LEVEL_HEIGHT];
 	struct VisualTile visual_data[LEVEL_WIDTH * LEVEL_HEIGHT];
 	int water_level;
+	int water_timer;
 	int width;
 	int height;
 	int gold;
@@ -34,6 +35,7 @@ extern struct Level level;
 /* need to set global before call: level_id */
 void level_load_bfile(void);
 void level_load_binary(void);
+void level_update(void);
 void level_draw(void);
 Tile level_get_tile(int x, int y);
 int level_is_water(int x, int y);

include/player.h

@@ -26,6 +26,7 @@ struct Player {
 	int jump_buffer;
 	int jump_grace;
 	int jumps_left;
+	int was_in_water;
 	enum AirState air_state;
 	/* animations */
 	struct Particle anim;

src/level/draw.c

@@ -41,6 +41,9 @@ water_draw(void)
 	while (x-- > 0) {
 		const Tile tile = level_get_tile(x, y);
 		if (tile != TILE_SOLID)
-			dimage(x * TILE_WIDTH, y * TILE_HEIGHT, &bimg_water);
+			dsubimage(
+			    x * TILE_WIDTH, y * TILE_HEIGHT, &bimg_water,
+			    (int)(level.water_timer / WATER_FLOW) * TILE_WIDTH,
+			    0, TILE_WIDTH, bimg_water.height, DIMAGE_NOCLIP);
 	}
 }

src/level/load.c

@@ -118,6 +118,7 @@ level_load_post(void)
 
 	/* disable water by default */
 	level.water_level = -1;
+	level.water_timer = 0;
 
 	y = level.height;
 	while (y-- > 0) {

src/level/update.c

@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/* Copyright (C) 2021 KikooDX */
+
+#include "conf.h"
+#include "level.h"
+
+void
+level_update(void)
+{
+	level.water_timer += 1;
+	if (level.water_timer == WATER_FRAMES * WATER_FLOW)
+		level.water_timer = 0;
+}

src/main.c

@@ -157,6 +157,7 @@ main(void)
 					particles_update();
 					player_return_code =
 					    player_update(&player, input);
+					level_update();
 					switch (player_return_code) {
 					case -1:
 						game_state = GamePause;

src/player/init.c

@@ -26,6 +26,7 @@ player_init(void)
 	    .jump_buffer = 0,
 	    .jump_grace = 0,
 	    .jumps_left = 0,
+	    .was_in_water = 0,
 	    .air_state = AirNeutral,
 	    .trail_state = 0,
 	    .blink_timer = BLINK_DELAY,

src/player/update.c

@@ -106,9 +106,12 @@ player_update(struct Player *restrict player, struct Input input)
 	}
 
 	/* swim */
-	if (k_jump && in_water) {
+	if (k_jump && (player->was_in_water || in_water)) {
 		jumped = 1;
-		player->spd_y = SWIM_SPD;
+		if (in_water)
+			player->spd_y = SWIM_SPD;
+		else
+			player->spd_y = SWIM_OUT_SPD;
 		player->air_state = AirRising;
 	}
 
@@ -207,6 +210,8 @@ player_update(struct Player *restrict player, struct Input input)
 	if (dir_x)
 		player->anim.flip_h = dir_x == -1;
 
+	player->was_in_water = in_water;
+
 	return 0;
 }
 

src/trail/update.c

@@ -15,7 +15,8 @@ void
 trail_update(struct Player player)
 {
 	int i = TRAIL_LIFE;
-	color_t color = player.trail_state ? ZX_WHITE : ZX_GRAY;
+	color_t color = ZX_WHITE;
+	/* color = player.trail_state ? ZX_WHITE : ZX_GRAY; */
 
 	if (player_collide_water(player))
 		color = ZX_CYAN;