fix: prevent multiple pieces from adding at once

User input was causing do_next_action to fire multiple times, which in
some cases led to multiple pieces starting at once. This adds a new
feature - add_piece_next_tick() - to opt-in to a new piece being added
on the next tick. We should still prevent next_action from firing
multiple times, but that's next and this is more resilient for all actions.

src/BloxBucket.gd

@@ -123,6 +123,12 @@ func maybe_tick():
 		tick()
 
 func tick():
+	if add_piece_on_tick:
+		add_piece_on_tick = false
+		start_next_piece()
+		resume_auto_ticking()
+		return
+
 	# step the grid forward
 	var any_change = grid.step(rule_inputs)
 
@@ -139,12 +145,17 @@ func pause_auto_ticking():
 func resume_auto_ticking():
 	auto_ticking = true
 
+var add_piece_on_tick = false
+func add_piece_next_tick():
+	add_piece_on_tick = true
+
 ## on grid update ################################################
 
 func do_next_action():
 	if action_queue.is_empty():
 		if grid_state == BloxGrid.STATE_SETTLING:
-			start_next_piece()
+			if not current_piece:
+				add_piece_next_tick()
 		maybe_tick()
 		return
 
@@ -158,7 +169,7 @@ func on_grid_update(state):
 	pause_auto_ticking()
 
 	match (state):
-		BloxGrid.STATE_SPLITTING, BloxGrid.STATE_CLEARING:
+		BloxGrid.STATE_SPLITTING, BloxGrid.STATE_CLEARING, BloxGrid.STATE_SETTLING:
 			# clear to prevent any user action
 			current_piece = null
 		_: pass
@@ -254,6 +265,9 @@ func on_rows_cleared(rows: Array):
 ## start_next_piece ################################################
 
 func start_next_piece():
+	if current_piece:
+		Log.warn("already have a current_piece!?")
+
 	if len(piece_queue) < 4:
 		queue_pieces()
 

src/BloxGame.gd

@@ -16,14 +16,18 @@ var score = 0
 
 @onready var next_piece_grid: GridContainer = $%PieceQueueGridContainer
 
+@onready var crtv_effect = $%CRTVEffect
+
 ## ready #############################################
 
 func _ready():
 	grid = bucket.grid
 
 	grid.on_groups_cleared.connect(func(groups):
 		for cells in groups:
-			add_to_score_label(len(cells)))
+			add_to_score_label(len(cells))
+		# TODO crtv_effect abberation tween
+		)
 	grid.on_rows_cleared.connect(func(rows):
 		for cells in rows:
 			add_to_score_label(len(cells)))

src/BloxGame.tscn

@@ -10,7 +10,7 @@ shader_parameter/overlay = true
 shader_parameter/scanlines_opacity = 0.2
 shader_parameter/scanlines_width = 0.1
 shader_parameter/grille_opacity = 0.2
-shader_parameter/resolution = Vector2(640, 480)
+shader_parameter/resolution = Vector2(1920, 1440)
 shader_parameter/pixelate = true
 shader_parameter/roll = true
 shader_parameter/roll_speed = 1.2
@@ -155,6 +155,7 @@ custom_minimum_size = Vector2(2.08165e-12, 64)
 layout_mode = 2
 
 [node name="CRTVEffect" type="ColorRect" parent="UI"]
+unique_name_in_owner = true
 material = SubResource("ShaderMaterial_2o1j2")
 anchors_preset = 15
 anchor_right = 1.0