Drop from where? You want it to fall from the sky? You want multiple rocks falling from the sky?

You can use the generic sprite (sprite generator) and make it generate Chuck's Rock. The sprite number for the rock is 48. Make the generator generate normal sprite 48.

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Spritetool. That's what the thread is about...


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Copy this into generic.asm:

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Sprite Generator, by mikeyk
;;
;; Description: This will generate a normal sprite or a custom sprite depending on the
;; first extra bit. Specify the actual sprite that is generated below
;;
;; NOTE: Trying to generate a sprite that doesn't exist will crash your game
;;
;; Uses first extra bit: YES
;; if the first extra bit is set a custom sprite will be generated
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

SPRITE_TO_GEN = $48 ;only used if first extra bit is clear
CUST_SPRITE_TO_GEN = $20 ;only used if first extra bit is set

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; sprite code JSL
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

dcb "INIT" ;generators don't have an init routine
dcb "MAIN"
PHB
PHK
PLB
JSR SPRITE_CODE_START
PLB
RTL

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; main sprite code
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

EXTRA_BITS = $7FAB10
NEW_SPRITE_NUM = $7FAB9E

TBL_B2D0 dcb $F0,$FF
TBL_B2D2 dcb $FF,$00
TBL_B2D4 dcb $10,$F0

SPRITE_CODE_START LDA $14
AND #$3F
BNE RETURN
JSL $02A9DE
BMI RETURN
TYX

LDA #$08 ; store sprite status
STA $14C8,x

LDA $18B9 ; check if first extra bit is set
AND #$40
BNE CUST

NORMAL LDA #SPRITE_TO_GEN ; store sprite number
STA $9E,x
JSL $07F7D2 ; reset sprite properties
BRA SHARED

CUST LDA #CUST_SPRITE_TO_GEN ; store custom sprite number
STA NEW_SPRITE_NUM,x
JSL $07F7D2 ; reset sprite properties
JSL $0187A7 ; get table values for custom sprite
LDA #$88 ; mark as initialized
STA EXTRA_BITS,x
PHK ; call init routine on sprite
PER.W #$0002
JML ($0000)

SHARED JSL $01ACF9
AND #$7F
ADC #$40
ADC $1C
STA $D8,x
LDA $1D
ADC #$00
STA $14D4,x
LDA $148E
AND #$01
TAY
LDA TBL_B2D0,y
CLC
ADC $1A
STA $E4,x
LDA $1B
ADC TBL_B2D2,y
STA $14E0,x
LDA TBL_B2D4,y
STA $B6,x
RETURN RTS


Then, add generic.cfg to the spritelist; since it is a generator, its sprite number on the spritelist will be a number from D0 to DF.

When you have runed spritetool, and the sprite is in your hack; go to Lunar Magic, click on the Koopa shell button to go to the sprite editing mode, and press "Insert". In the command, type whatever number you set the sprite to use, and on the extra info space, type 2.

Then, put it on a level and test.

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