The Trap Door: Routine at 45020

45020: Script Routine: (27) Animate trap door / update Berk interaction

Animate the trap door for Drutt's current action and refresh Berk's interaction with it.
ScriptRoutine_AnimateTrapDoorBerk	45020	LD A,(29371)	Load A with Drutt's animation counter (DruttAnimationCounter).
	45023	OR A	Is Drutt's animation counter (DruttAnimationCounter) zero? If not, jump to AdvanceScriptInstruction to run the next script instruction.
	45024	JP NZ,AdvanceScriptInstruction

	45027	LD A,12	Load A with sound index 12.
	45029	CALL Queue_Sound	Call Queue_Sound to queue a sound effect.
	45032	LD IY,37005	Point IY at complex entity state StateData_Complex_30.
	45036	DEC (IY+5)	Move the referenced entity one character up.
	45039	DEC (IY+6)	Move the referenced entity one character up.
	45042	LD A,(IY+6)	Load A with the referenced entity's y-extent.
	45045	CP 22	Is the y-extent still below the trap door open threshold 22? If not, jump to AnimateTrapDoor_ToggleFrame.
	45047	JR NZ,AnimateTrapDoor_ToggleFrame
	45049	CALL Reset_Trap_Door_Animation_State	Call Reset_Trap_Door_Animation_State to reset trap door animation state.
	45052	XOR A	Clear the trap door flags.
	45053	LD (29370),A	Set the trap door flags (TrapDoorFlags).
	45056	JR AnimateTrapDoor_SetLayoutB	Jump to AnimateTrapDoor_SetLayoutB to handle the trap door.
Toggle the lever animation phase and choose open facing left (GraphicLayout_LeverOpenLeft) or closed facing left (GraphicLayout_LeverClosedLeft).
AnimateTrapDoor_ToggleFrame	45058	LD A,(29370)	Load A with the trap door flags (TrapDoorFlags).
	45061	XOR %00000001	Toggle the trap door animation phase bit in A.
	45063	LD (29370),A	Set the trap door flags (TrapDoorFlags).
	45066	SRL A	Shift the trap door animation phase bit into the success marker.
	45068	JR NC,AnimateTrapDoor_SetLayoutB	Jump to AnimateTrapDoor_SetLayoutB to handle the trap door if the result did not underflow.
	45070	LD BC,43032	Point BC at the lever open, facing left (GraphicLayout_LeverOpenLeft).
	45073	JR AnimateTrapDoor_WriteLayout	Jump to AnimateTrapDoor_WriteLayout to handle the trap door.
Use the lever closed, facing left at GraphicLayout_LeverClosedLeft.
AnimateTrapDoor_SetLayoutB	45075	LD BC,43047	Point BC at the lever closed, facing left (GraphicLayout_LeverClosedLeft).
Install the chosen lever layout into Pointer_AnimatingSceneryLayout and continue the script.
AnimateTrapDoor_WriteLayout	45078	LD (37295),BC	Store BC in the animating scenery layout pointer (Pointer_AnimatingSceneryLayout).
	45082	JP AdvanceScriptInstruction	Jump to AdvanceScriptInstruction to run the next script instruction.