A bit rusty

so I want either delete the hud or move it to a different positon durring a boss... after a bit of experimenting I have come up with this....

Code:

Obj21:

		moveq	#0,d0

		move.b	$24(a0),d0

		move.w	Obj21_Index(pc,d0.w),d1

		jmp	Obj21_Index(pc,d1.w)

; ===========================================================================

Obj21_Index:	dc.w Obj21_Main-Obj21_Index

		dc.w Obj21_Flash-Obj21_Index

; ===========================================================================



Obj21_Bosstest:

				tst.b   ($FFFFFF96).w  &#59; is boss active?

				beq.s   Obj21_HUDBoss  &#59; if yes branch to HUDBoss

				

Obj21_Main:				

		addq.b	#2,$24(a0)

		move.w	#$90,8(a0)	 &#59; HUD X positon

				move.w	#$108,$A(a0)   &#59; HUD Y positon

		move.l	#Map_obj21,4(a0)

			move.w	#$6CA,2(a0)

		move.b	#0,1(a0)

		move.b	#0,$18(a0)

				bsr	 Obj21_Flash



Obj21_HUDBoss:		

				addq.b	#2,$24(a0)

				move.w	#$300,8(a0)	 &#59; HUD X positon durring boss battle

				move.w	#$108,$A(a0)   &#59; HUD Y positon durring boss battle

			   	move.l	#Map_obj21,4(a0)

			move.w	#$6CA,2(a0)

		move.b	#0,1(a0)

		move.b	#0,$18(a0)





Obj21_Flash:				

		tst.w	($FFFFFE20).w		  &#59; do you have any rings?

		beq.s	Obj21_Flash2		  &#59; if not, branch

		clr.b	$1A(a0)			  &#59; make all counters yellow

		jmp	DisplaySprite



; ===========================================================================

However... It just glitches and freezes upon start of a level - I know i am on the right track just that I havnt done much asm recently so i am a bit rusty !!!

 

First of all, you're doing your boss flag check in wrong place. It must be done after object is initialized, i.e. after Obj21_Main.


Second of all, the main issue with your code is "bsr Obj21_Flash", which branches to the label, but then returns when "rts" is called.


Also, last four rows in Obj21_HUDBoss are odd. Just put boss flag check in right place and you won't need them anymore and the object will work properly.

 

are we talking something like this...

Code:

Obj21_Main:				

					tst.b   ($FFFFFF96).w	&#59; is boss active?

					beq.s   Obj21_HUDBoss &#59; if yes branch to HUDBoss

					addq.b	#2,$24(a0)

					move.w   #$90,8(a0)	  &#59; HUD X positon

					move.w   #$108,$A(a0)  &#59; HUD Y positon

					move.l	 #Map_obj21,4(a0)

					move.w   #$6CA,2(a0)

					move.b	#0,1(a0)

					move.b	#0,$18(a0)

					bsr	 Obj21_Flash



Obj21_HUDBoss:		

				   addq.b	#2,$24(a0)

				   move.w	#$300,8(a0)	&#59; HUD X positon durring boss battle

				   move.w	#$108,$A(a0)  &#59; HUD Y positon durring boss battle

am I on the right track?

 

Not really...



Obj21: ; XREF: Obj_Index
moveq #0,d0


move.b $24(a0),d0


move.w Obj21_Index(pc,d0.w),d1


jmp Obj21_Index(pc,d1.w)


; ===========================================================================


Obj21_Index: dc.w Obj21_Main-Obj21_Index


dc.w Obj21_ChkBoss-Obj21_Index


; ===========================================================================


Obj21_Main: ; XREF: Obj21_Main


addq.b #2,$24(a0)


move.w #$90,8(a0)


move.w #$108,$A(a0)


move.l #Map_obj21,4(a0)


move.w #$6CA,2(a0)


move.b #0,1(a0)


move.b #0,$18(a0)


Obj21_ChkBoss:


tst.b ($FFFFF7AA).w ; is boss mode on?


beq.s Obj21_Flash ; if not branch


; your code to move the HUD


Obj21_Flash: ; XREF: Obj21_Main


tst.w ($FFFFFE20).w ; do you have any rings?


beq.s Obj21_Flash2 ; if not, branch


clr.b $1A(a0) ; make all counters yellow


jmp DisplaySprite



When saying "after Obj21_Main", I meant after the last row in this label, i.e. after "move.b #0,$18(a0)".


Also, I see you were using some custom flag for boss checking. I would advise to use $F7AA instead. This flag is used in original code to check boss mode. This is actually one of the flags to lock the screen, which is actives to lock screen during the boss battle.


And one more thing. In your code, there was:



tst.b ($FFFFFF96).w ; is boss active?
beq.s Obj21_HUDBoss ; if yes branch to HUDBoss



This is logically incorrect, because beq branches to the label when your flag is zero, so it would better to write "if not, branch" instead.

 

lol - seriously need to get my head back into gear with this, thanks for the help gonna go have a play with it.

 

Basically after the tst.b the beq here is like the opposite. Imagine it being beq, but it does what bne does. Well thats how I see it through experiment.( i'm proberly talking a load of bullshit but meh) Vice versa for bne.s when using the tst command.

 

Not sure it will work that way either, if I remember correctly, the "main" code is run only once, so it won't get back to that code and check whether you're in boss mode or not. What I did (mine is for the signpost, but there shouldn't be any difference) was putting the code by the end of the flash routines, before the clr.b and jmp.

 

tst tests for 0. So say you wanted to check for boss mode:



tst.b ($FFFFFF96).w ; is boss active?
beq.s Obj21_HUDBoss ; if yes branch to HUDBoss



It takes you to "Obj21_HUDBoss" if it's not, because it tests for 0. So you should reverse bne and beq when talking about tst.

 

Basically what I said, minus the testing 0, I think its been mentioned anyways.

 

I wanted to give an example.

 

OK, we get the point guys, let's just drop it here so we don't spur any arguments eh? =)

 

Thanks for all the input guys ^_^