mirror of
https://github.com/a2-4am/4cade.git
synced 2024-09-30 00:56:24 +00:00
132 lines
3.4 KiB
Plaintext
Executable File
132 lines
3.4 KiB
Plaintext
Executable File
;license:MIT
|
|
;(c) 2019-2020 by 4am/qkumba
|
|
;
|
|
; randomized fade-to-black routine customized for a specific piece of cover art
|
|
; with 75 fill rectangles
|
|
;
|
|
|
|
!cpu 6502
|
|
!to "build/FX/COVERFADE",plain
|
|
*=$6000
|
|
|
|
!source "src/fx/macros.a"
|
|
|
|
+READ_ROM_NO_WRITE
|
|
|
|
;init RNG
|
|
|
|
lda $C050
|
|
and #$7F
|
|
bne +
|
|
lda #$01
|
|
+ sta @rnd+1
|
|
sta @exit+1
|
|
|
|
lda #$20
|
|
sta $e6
|
|
|
|
;iterate
|
|
|
|
@loop ldy @rnd+1
|
|
tya
|
|
lsr
|
|
bcc +
|
|
|
|
;feedback polynomial forms #$41 for period of 127
|
|
|
|
eor #$41
|
|
+ sta @rnd+1
|
|
cpy #75+1
|
|
bcs +
|
|
|
|
lda width - 1, y
|
|
sta $fd
|
|
lda height - 1, y
|
|
sta $fe
|
|
lda startx - 1, y
|
|
sta $ff
|
|
lda starty - 1, y
|
|
|
|
-- pha
|
|
|
|
ldx #0
|
|
ldy #0
|
|
jsr $f411 ;hposn
|
|
|
|
lda #0
|
|
ldx $fd
|
|
ldy $ff
|
|
- sta ($26), y
|
|
iny
|
|
dex
|
|
bne -
|
|
pla
|
|
clc
|
|
adc #1
|
|
dec $fe
|
|
bne --
|
|
|
|
lda #80
|
|
sec
|
|
@wait1 pha
|
|
@wait2 sbc #1
|
|
bne @wait2
|
|
pla
|
|
sbc #1
|
|
bne @wait1
|
|
|
|
+
|
|
@rnd lda #0
|
|
@exit cmp #1
|
|
bne @loop
|
|
+READ_RAM1_WRITE_RAM1
|
|
rts
|
|
|
|
width
|
|
!byte 02, 03, 03, 05, 03, 03, 03, 03
|
|
!byte 03, 03, 03, 03, 04, 04, 03, 02
|
|
!byte 03, 03, 04, 07, 03, 02, 03, 03
|
|
!byte 03, 03, 03, 03, 03, 03, 03, 03
|
|
!byte 02, 03, 07, 04, 05, 03, 05, 05
|
|
!byte 03, 04, 06, 07, 04, 03, 03, 03
|
|
!byte 03, 02, 04, 05, 03, 03, 04, 06
|
|
!byte 03, 02, 04, 06, 03, 03, 03, 03
|
|
!byte 04, 03, 02, 03, 02, 03, 03, 03
|
|
!byte 03, 03, 02
|
|
|
|
height
|
|
!byte 12, 16, 26, 13, 15, 09, 24, 18
|
|
!byte 11, 23, 17, 15, 13, 20, 22, 13
|
|
!byte 16, 12, 21, 18, 10, 15, 10, 21
|
|
!byte 17, 12, 12, 12, 17, 12, 08, 26
|
|
!byte 18, 13, 44, 23, 21, 19, 17, 30
|
|
!byte 11, 10, 25, 18, 07, 14, 13, 15
|
|
!byte 11, 12, 28, 16, 15, 17, 35, 17
|
|
!byte 07, 13, 12, 06, 11, 12, 19, 15
|
|
!byte 11, 08, 13, 07, 16, 12, 24, 16
|
|
!byte 23, 22, 11
|
|
|
|
startx
|
|
!byte 000, 000, 001, 000, 000, 000, 000, 002
|
|
!byte 003, 001, 004, 003, 003, 003, 006, 007
|
|
!byte 005, 006, 006, 007, 008, 009, 008, 009
|
|
!byte 010, 011, 011, 012, 012, 012, 013, 014
|
|
!byte 015, 015, 014, 016, 017, 018, 017, 018
|
|
!byte 020, 020, 021, 021, 022, 022, 024, 025
|
|
!byte 024, 026, 027, 026, 028, 029, 028, 027
|
|
!byte 030, 031, 031, 032, 034, 033, 033, 033
|
|
!byte 032, 033, 034, 035, 036, 037, 037, 037
|
|
!byte 037, 037, 038
|
|
|
|
starty
|
|
!byte 000, 016, 042, 076, 103, 153, 167, 003
|
|
!byte 027, 123, 049, 098, 152, 172, 008, 036
|
|
!byte 139, 119, 071, 154, 101, 131, 181, 009
|
|
!byte 040, 070, 115, 134, 091, 177, 008, 030
|
|
!byte 068, 109, 128, 169, 003, 031, 058, 091
|
|
!byte 150, 179, 117, 072, 025, 046, 002, 151
|
|
!byte 178, 095, 008, 046, 069, 094, 118, 173
|
|
!byte 040, 018, 058, 003, 015, 034, 079, 106
|
|
!byte 147, 163, 178, 133, 051, 178, 148, 106
|
|
!byte 073, 022, 000
|