Custom Sprite Help

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anonymousbl00dlust

Posted on 02-09-12 11:38 PM (rev. 3 of 02-09-12 11:40 PM)

Link | Quote | ID: 149829

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I made this special version of the creating eating block from smw that not only allows me to choose what direction to go in but also what tile to generate. Unfortunately, I've need to generate certain tiles that aren't specified by $9C (the table of tiles that the normal generation routine can summon). The structure of it looks more or less like this:

MAP16_NUMY	    db $03,$04,$05,$06,$00,$03,$04,$05,$06
X_SPEED		    dcb $10,$F0,$00,$00,$00,$10,$F0,$00,$00
Y_SPEED		    dcb $00,$00,$10,$F0,$00,$00,$00,$10,$F0
DIRECTION	    dcb $00,$00,$01,$00,$02,$00,$00,$00,$03,$00,$00

stuff happens, then


		LDA X_SPEED,y           ; \ set x speed
		    STA $B6,x               ; /

		    LDA Y_SPEED,y           ; \ set y speed
		    STA $AA,x               ; /

		    LDA MAP16_NUMY,y	    ; \ set direction-based tile-gen table
		    STA $185E		    ; / for Block1 code later (done while y is still correct)

decides weather or not to be a creating or an eating block, then

BLOCK1		;block chosen to gen already selected when sprite speed was set			

		    LDA $185E		;choosing tile to generate from table
		    STA $9C		;

		    LDA $E4,x		;sprite xpos low (table)
		    STA $9A		;blockgen xpos of contact low
		    LDA $14E0,x		;sprite xpos high (table)
		    STA $9B		;blockgen xpos of contact high
		    LDA $D8,x		;sprite ypos low (table)
		    STA $98		;blockgen ypos of contact low
		    LDA $14D4,x		;sprite ypos high (table)
		    STA $99		;blockgen ypos of contact high

		    JSL $00BEB0		; generate Map16 tile routine
                    RTS

BLOCK2 		LDA #$02		; always generate a blank tile, effectively 'eating'
		    STA $185E		; tile from map16

		    LDA $185E		;choosing tile to generate from table
		    STA $9C		;

		    LDA $E4,x		;sprite xpos low (table)
		    STA $9A		;blockgen xpos of contact low
		    LDA $14E0,x		;sprite xpos high (table)
		    STA $9B		;blockgen xpos of contact high
		    LDA $D8,x		;sprite ypos low (table)
		    STA $98		;blockgen ypos of contact low
		    LDA $14D4,x		;sprite ypos high (table)
		    STA $99		;blockgen ypos of contact high

		    JSL $00BEB0		; generate Map16 tile routine
                    RTS

so the problem is, this only lets me generate certain map16 tiles. To fix this I had to use a tile generation hijack patch, but according to the readme I have to implement the hijacked routine like so:

Posted by readme
GENERATE ARBITRARY MAP16 TILE

LDA.b #$FF
STA.b $9C
;;STORE YOUR 16-BIT BLOCK NUMBER into $0660/1
JSL $00BEB0

I don't know understand how to implement this alternate method using the same logic that I currently have set up. how can I get this to work?

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