dos33fsprogs/demosplash2019/pt3_lib_write_lc.s
2019-11-15 22:28:28 -05:00

156 lines
2.5 KiB
ArmAsm

;====================================
; generate 4 patterns worth of music
; at address $D000-$FC00
pt3_write_lc_4:
; page offset
lda #0
sta FRAME_PAGE
lc4_frame_decode_loop:
jsr pt3_set_pages
jsr pt3_write_lc
lda FRAME_PAGE
cmp #4
bne lc4_frame_decode_loop
rts
pt3_write_lc_8:
; page offset
lda #0
sta FRAME_PAGE
lc8_frame_decode_loop:
jsr pt3_set_pages
jsr pt3_write_lc
lda FRAME_PAGE
cmp #8
bne lc8_frame_decode_loop
rts
;==============================
; write one page of frame data
pt3_write_lc_1:
; page offset
lda #0
sta FRAME_PAGE
jsr pt3_set_pages
jsr pt3_write_lc
rts
;==============================
; write one page of frame data
pt3_write_lc:
; offset within page
lda #0
sta FRAME_OFFSET
lc_frame_decode_loop:
jsr pt3_make_frame
jsr pt3_write_frame
inc FRAME_OFFSET
lda SOUND_WHILE_DECODE
beq no_play_music
lda FRAME_OFFSET
and #$7
bne no_play_music
jsr play_frame_compressed
no_play_music:
lda FRAME_OFFSET
cmp #59*3 ; FIXME: make this depend on song
; hardcoding for 59 for our song
bne lc_frame_decode_loop
inc FRAME_PAGE
rts
;========================
;
pt3_set_pages:
lda FRAME_PAGE
asl
asl
asl
asl
tay
lda music_addr_table+0,Y
sta r0_wrsmc+2
lda music_addr_table+1,Y
sta r1_wrsmc+2
lda music_addr_table+2,Y
sta r2_wrsmc+2
lda music_addr_table+3,Y
sta r4_wrsmc+2
lda music_addr_table+4,Y ;5+13=D4
sta r13_wrsmc+2
lda music_addr_table+5,Y
sta r6_wrsmc+2
lda music_addr_table+6,Y
sta r7_wrsmc+2
lda music_addr_table+7,Y
sta r8_wrsmc+2
lda music_addr_table+8,Y
sta r9_wrsmc+2
lda music_addr_table+9,Y
sta r11_wrsmc+2
lda music_addr_table+10,Y
sta r12_wrsmc+2
rts
.align $100
music_table_begin:
music_addr_table:
.byte $f1,$f2,$f3,$f4,$f5,$f6,$f7,$f8,$f9,$fa,$fb,$BB,$CC,$DD,$EE,$FF ;0
.byte $e6,$e7,$e8,$e9,$ea,$eb,$ec,$ed,$ee,$ef,$f0,$BB,$CC,$DD,$EE,$FF ;1
.byte $db,$dc,$dd,$de,$df,$e0,$e1,$e2,$e3,$e4,$e5,$BB,$CC,$DD,$EE,$FF ;2
.byte $d0,$d1,$d2,$d3,$d4,$d5,$d6,$d7,$d8,$d9,$da,$BB,$CC,$DD,$EE,$FF ;3
.byte $14,$15,$16,$17,$18,$19,$1A,$1B,$1C,$1D,$1E,$BB,$CC,$DD,$EE,$FF ;4
.byte $1F,$20,$21,$22,$23,$24,$25,$26,$27,$28,$29,$BB,$CC,$DD,$EE,$FF ;5
.byte $2A,$2B,$2C,$2D,$2E,$2F,$30,$31,$32,$33,$34,$BB,$CC,$DD,$EE,$FF ;6
.byte $35,$36,$37,$38,$39,$3A,$3B,$3C,$3D,$3E,$3F,$BB,$CC,$DD,$EE,$FF ;7
;.byte $d0,$d1,$d2,$d3,$d4,$d5,$d6,$d7,$d8,$d9,$da,$BB,$CC,$DD,$EE,$FF
music_table_end:
.assert >music_table_begin = >music_table_end, error, "music_table crosses page"