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;;; Simple sprite that can be moved with the dpad easily. Use it to have
;;; something funny moving.
.include "joypad.s"
.scope Diskun
m_screen_x = $30
m_screen_y = $31
.proc init_palettes
lda #$3F
sta $2006 ; PPUADDR
lda #$00
sta $2006 ; PPUADDR
ldx #0
@load_palettes_loop:
lda palettes, x
sta $2007 ; PPUDATA
inx
cpx #$20
bne @load_palettes_loop
rts
palettes:
DEFAULT_COLOR = $11
;; Background
.byte DEFAULT_COLOR, $36, $17, $0F
.byte DEFAULT_COLOR, $00, $00, $00
.byte DEFAULT_COLOR, $00, $00, $00
.byte DEFAULT_COLOR, $00, $00, $00
;; Foreground
.byte DEFAULT_COLOR, $28, $0F, $30
.byte DEFAULT_COLOR, $00, $00, $00
.byte DEFAULT_COLOR, $00, $00, $00
.byte DEFAULT_COLOR, $00, $00, $00
rts
.endproc
.proc update
lda #Joypad::BUTTON_UP
and Joypad::m_buttons1
beq @check_down
dec Diskun::m_screen_y
dec Diskun::m_screen_y
jmp @check_left
@check_down:
lda #Joypad::BUTTON_DOWN
and Joypad::m_buttons1
beq @check_left
inc Diskun::m_screen_y
inc Diskun::m_screen_y
@check_left:
lda #Joypad::BUTTON_LEFT
and Joypad::m_buttons1
beq @check_right
dec Diskun::m_screen_x
dec Diskun::m_screen_x
@check_right:
lda #Joypad::BUTTON_RIGHT
and Joypad::m_buttons1
beq @end
inc Diskun::m_screen_x
inc Diskun::m_screen_x
@end:
rts
.endproc
.proc nmi_update
lda Diskun::m_screen_x
sta $203
sta $20B
clc
adc #8
sta $207
sta $20F
lda Diskun::m_screen_y
sta $200
sta $204
clc
adc #8
sta $208
sta $20C
rts
.endproc
.endscope
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