add directional characters display

src/consts/game.asm

@@ -2,18 +2,3 @@ pub const game.direction_up = 0
 pub const game.direction_right = 1
 pub const game.direction_down = 2
 pub const game.direction_left = 3
-pub const game.direction_still = 4
-
-/*
-; 1_000_000_000 nano second = 0x0000_0000_3B9A_CA00
-pub const game.tick_duration_0 = 0xCA00
-pub const game.tick_duration_1 = 0x3B9A
-pub const game.tick_duration_2 = 0x0000
-pub const game.tick_duration_3 = 0x0000
-*/
-
-; 0.5 second = 500_000_000 nano second = 0x0000_0000_1DCD_6500
-pub const game.tick_duration_0 = 0x6500
-pub const game.tick_duration_1 = 0x1DCD
-pub const game.tick_duration_2 = 0x0000
-pub const game.tick_duration_3 = 0x0000

src/consts/sprites.asm

@@ -7,12 +7,23 @@ pub const sprites.rotation_90 = 1
 pub const sprites.rotation_180 = 2
 pub const sprites.rotation_270 = 3
 
-pub const sprites.empty = 0
+pub const sprites.empty = 0 ; must stay 0 (some code avoid addition when it knows the tile is empty)
 pub const sprites.unimplemented = 1
 pub const sprites.wall_end = 2
 pub const sprites.wall_straight = 3
 pub const sprites.wall_corner = 4
+
 pub const sprites.robot = 5
-pub const sprites.ghost = 6
-pub const sprites.coin = 7
-pub const sprites.max = 7 ; for lookup table
+pub const sprites.robot_up = 5
+pub const sprites.robot_right = 6
+pub const sprites.robot_down = 7
+pub const sprites.robot_left = 8
+
+pub const sprites.ghost = 9
+pub const sprites.ghost_up = 9
+pub const sprites.ghost_right = 10
+pub const sprites.ghost_down = 11
+pub const sprites.ghost_left = 12
+
+pub const sprites.coin = 13
+pub const sprites.max = 13 ; for lookup table